Download PSHC6S00 General Digital Thyristor Firing Board Data Sheet

Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
PSHC6S00
General Digital Thyristor Firing Board
Data Sheet
Beijing Power-sem Electronic Technique Co, Ltd
1
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
Contents
Summary.......................................................................................................................................3
Brief introduction..........................................................................................................................3
Basic principle ..............................................................................................................................3
1 Phase-locked loop ..............................................................................................................4
2 Trigger pulse drive circuit..................................................................................................6
The feature of PSHC6S00 firing board.........................................................................................7
Application ...................................................................................................................................8
1 Two-quadrant bridge converter ..........................................................................................8
2 Four-quadrant bridge converter .......................................................................................11
3 AC controller....................................................................................................................13
4 Induction generator controller..........................................................................................13
5 Double reverse star rectifier.............................................................................................14
Handling .....................................................................................................................................17
Appendix.....................................................................................................................................19
1 Main technical parameters of the firing board .................................................................19
2 Introduction of PSHC12S00 and PSHC2S00 ..................................................................19
2
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
Summary
PSHC6S00 firing board is generally used for controlling gate propagation trigger of thyristor
modules to realize phase-shift control. It forms a good buffer interface among computer, simulation
& digital regulator and high power main circuit. On one hand, it ensures the control signal
transmission reliably and effectively to realize the control function of system setting. On the other
hand, it can reduce the interference to the controller from main circuit and ensure the safety of the
main circuit automatically while the computer and control circuit are out of control, which improves
the reliability of system working.
Brief introduction
With the development of electronic technology，many kinds of new power devices come into
market gradually. But thyristor modules are widely used because of its unmatched high voltage and
current. Therefore, the reliability and stability of the trigger circuit is the key to ensure all the power
electronic equipments work normally and effectively.
The traditional domestic three-phase thyristor trigger circuit is generally composed by small IC
simulation chip KC or KJ series. In such circuit, trigger pulse of every phase is translated into
sawtooth signal by synchronous signal transmitted from synchronizing transformer and then get
phase-shift signal by comparing with the given dc voltage. There is a close relation between the
slope, duty ratio, scope of three-phase sawtooth signal and each phase component parameters, so
even a small interference in comparison signal may cause a big phase-shift fault. Additionally, the
symmetrical balance of three-phase pulse is depended on the adjustment of three sawtooth slopes.
And only more than four potentiometers are adjusted, the circuit can operate normally because of its
disadvantage of reliability and automatic balance ability. The trigger signal may even cause damage
to the components of main loop circuit when there is a serious interference or imbalance by poor
contact of the potentiometer.
The trigger circuit needs to be redesigned according to different application as it composed by
simulation chip. The input power supply of different phase sequence, synchronous transformer, and
thyristor corresponded by trigger pulse all should be checked by the oscillograph strictly. Besides, it
needs to design another circuit for accessory circuit, such as lack phase protection and soft start and
stop The entire circuit seems too complex in design and adjustment.
General purpose thyristor firing board --PSHC6S00 is a kind of thyristor trigger system that
designed with the chip technology of 40-chip CMOS application specific integrated circuit (ASIC).
It applies phase-locked loop (PLL) and multi-chip module (MCM) and is based on the logic
relationship between three-phase synchronous signal locked by the voltage control oscillator (VCO).
It has a 0-5V dc input voltage signal, can control the phase-shift of output pulse from
5°-175°adjustable. And any adjustor or manual output voltage can connect with it easily (including
the D/A signal by the computer) to control the operation of high power thyristor. The firing board
forms a good buffer interface between the adjustor or computer PID adjustment and the high power
thyristor to ensure the safety of system when the adjustor are out of control.
Basic principle
The diagram of PSHC6S00 general thyristor firing board can be shown in figure 1.
The composition of firing board:
Phase standard(reference) circuit, buffer amplifier and soft start/stop circuit, phase-locked loop,
3
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
lack phase detection and inhibit circuit, phase sequence detection and select switch, monitoring
circuit, pulse amplifier and pulse transformer and so on.
Below is the detailed analysis of key technology of firing board --- phase-locked loop to
understand the systematic working principle then analyze pulse drive circuit and introduce drive
ability.
PHASE CONTROL +12V
VDD
ASIC
I1
INHIBIT SIGNAL
J6-8
STROBE SIGNAL
J6-19
INHIBIT GATING
LOGIC DECODING
CIRCUIT
P
+30VDC
J4-1
POWER
SUPPLY
220VAC
J6-10
+12VDC
J6-9
+ 5 VDC
J6-6
J6-5
CORRECTI
NG
CIRCUIT
24kHz
LOW-PASS
FILTER
-AP'
J2-2
-BP'
J2-5
-CP'
J2-8
VCO
J1-2
J1-8
-AP
J2-2
-BP
PHASE-SEQUENCE
DETECTION
RN1
K
+CP
PHASE-SEQUENCE SIGNAL
OUTPUT
+5V
+BP
G
J1-5
PHASE REFERENCE
COMPENSATION
PHASE-SEQUENCE
SELECTOR SWITCH
50Hz/60Hz
LOW-PASS FILTER
ATTENUATOR
OUTSIDE SYNCHRONOUS
SIGNAL
UC J5-5
J2-5
-CP
J2-8
VSS
R31 ~ R33
J1-1
J1-4
J1-7
J2-1
J2-4
J2-7
PSHC6S00
ASSISTANCE
FIRING BOARD
+AP
UB J5-3
J1-2
J1-8
CK1
XOR PHASE
DETECTOR
UA J5-1
K
CK2
80
FREQUENCY
DIVISION
LACK-PHASE
DETECTION
INHIBIT CIRCUIT
SUMMING
AMPLIFIER
G
+CP'
6 FREQUENCY
DIVISION
SIG
BUFFER
AMPLIFICATION
SOFT
START/STOP
PULSE
AMPLIFICATION
J1-5
300Hz
GATE DELAY
COMMAND
J9
+AP'
+BP'
COM
J6-7
J4-5
PULSE
TRANSFORMER
J1-1
J1-4
J1-7
J2-1
J2-4
J2-7
PULSE
AMPLIFICATION
PULSE
TRANSFORMER
PSCH6S00 MAIN FIRING BOARD
Fig 1 The diagram of PSHC6S00 firing board
1. Phase-locked loop
Because phase-locked loop is the key of entire trigger circuit which make the output trigger pulse
and power supply achieve synchronization, this part needs to be analyzed carefully.
The circuit of phase-locked loop gate delay angle generator shown in figure 2. It contains
summing amplifier, voltage control oscillator (VCO), 80 divider, 5/6 divider, three-phase split-phase
device. Three independent nor gate phase detectors and a voltage control oscillator compose the
three-phase locked loop.
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Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
C2
Gate delay
command
0 / 5V
+5V
R2
Buffer
amplifier
K
S
R4
10 / 0V
C1
CK1
( 24kHz )
VCO
80 DIVIDER
R1
5/6 DIVIDER
R3
R
Da
CURRENT REFERENCE
Phase
reference
circuit
A
B
C
R
Db
CK2
( 300Hz )
R
Dc
SPILT-PHASE
DEVICE
DELAY REFERENCE
Ad
Bd
Cd
DECODE
LOGIC
CIRCUIT
DELAY
GATE
SIGNAL
COMMAND
GATING
Fig 2 The circuit of phase-locked loop gate delay angle generator
The phase-locked loop has high frequency response and can achieve lock-phase in a power
supply cycle.
The angle frequency of the voltage control oscillator output signal is controlled by the input
control voltage, but in the phase-locked loop circuit, the output signal of three nor gate detector and
the output signal of gate delay order being overlaid. And then transmit output signal during filtering
as control voltage to VCO input stage in order to control its oscillate frequency. When the loops
were being locked, the oscillator signal with 480 times power frequency which called CK1 is output
by VCO.
CK2 signal obtained after CK1 was being divided by 80 divider, whose frequency is 6 times as
the power frequency. With CK2 signal being divided by six divider and split-phase device, we can
get three delayed reference signals Aa, Bb, Cc, whose frequency is power frequency, width is
180°and phase difference is 120°. These three signals and the power reference signal ABC which
generated by phase reference circuit were input to three-phase nor gate detector separately, which get
a phase difference signal Da, Db, Dc.
When the output signal frequency of voltage control oscillator(VCO) was locked in the range of
power frequency W (for example 480 times), the control voltage of VCO should be a constant value,
that is sum of phase difference signal and the gate delay order after snubbed should be a constant
value. When the gate delays voltage raise, the snubbed voltage get down. In order to keep the
frequency locked and the VCO control voltage be at a constant value, the average voltage of phase
difference signal rises, thus there is a reduce in phase difference between power reference and
delayed reference signal. As the trigger pulse delay angle was determined by the delayed reference
signal, it realize the phase-shift of thyristor successfully.
Different main circuit may request different minimal and maximum value of trigger pulse delay.
But this can be done by adjusting the bias resistor R3 and range resistor R2, the former determine the
initial reference inverter position (that is the maximum delay angle of trigger pulse) of angle β, and
the latter determine the range of pulse phase-shift.
The firing board contains a jack J10 to make it work in a condition of 60Hz power frequency by
5
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
changing the connection of the pins. When the power frequency is 50Hz, short bridge 1 and 2 of J10
to make 5/6 divider operate in 6 divider. When the power frequency is 60Hz, short bridge 2 and 3 of
J10 to make 5/6 divider operate in 5 divider and thus realize to lock the phase.
2. Trigger pulse drive circuit
The pulse drive circuit contains a pulse amplifier circuit and pulse transformer. The pulse drive
principle of any thyristor (for example phase +A) shown in figure 3 and the waveform +AP, output
pulse waveform P shown in figure 4.
Fig 3 Pulse drive circuit
Fig 4 Typical waveform +AP and pulse waveform
The thyristor conduct when there is signal in the terminal +AP. The primary side of pulse
transformer get a +30V power voltage because of the instant short circuit of 033μF capacitor. And
the secondary side get a signal of +15V peak pulse at the same time, which can be used as strong
trigger pulse to make thyristor conduct rapidly, thus improve the reliability of trigger. With the
high-frequency modulation of terminal +AP, the secondary side of pulse transformer get a lasting
low (75V) high-frequency modulation pulse and continue to supply firing pulse for thyristor. It can
improve the stability when the current shut off and reduce the power level of the driver circuit.
6
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
The above-mentioned drive circuit can make output trigger pulse up to 15V/2A, so they are
completely suit for all thyristor firing with high power (for example above 1000A) and for trigger
thyristor with small power above 5V.
The feature of PSHC6S00 firing board
To sum up, the features of PSHC6S00 firing board are summarized as below: With the
three-phase trigger pulse being outputted by high frequency synchronic pulse, it has a high degree of
symmetry, balance and control linearity, overcoming many shortages of KC, KJ series. The driver is
synchronized with power network automatically by connecting the synchronous signal that gets from
the high resistance R31-R33 directly with the main circuit of the thyristor (no separate line), so it
needs no synchronous transformer. It has automatic monitor ability of phase sequence to make the
connection between the main circuit and adjustor simple and reliable without any adjustment and
measurement. And different resistance are adopted according to different main circuit line voltage of
high resistance R31-R33, which shown in table 1.
Main circuit line voltage
480V-280V
280V-120V
120V-24V
Sampling resistance
2 MΩ
1 MΩ
220 KΩ
The firing board has multi-function, such as lack-phase protection and soft start and stop and so
on. There is no need to design additional monitor control circuit.
The firing board contains an 8-pull switch and different pulse can be got from different
combinations. For example the initial reference phase of output pulse is 0° or 30°; modulation or
non-modulation pulse, the modulation pulse is double 30°(that is 2-30°)pulse, 120° wide pulse or
double narrow pulse(the interval is 60°).
The firing board can output a 12 gate pulse signal with a mutual difference of 30°easily by
combining the main firing board and assistant firing board rather than use another independent gate
delay generator. You can do it just by connecting terminal (19) of J6 (P, choose order terminal) to
terminal ④ (CK2). Because when P is high level, the main firing board output pulse; when P is low
level, assistant board output pulse. 50% of CK2’s duty ratio of 300Hz are frequency signal and have
a stable phase relation with output trigger pulse. We suggest using the pulse range 2-30°.
7
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
Application
1. Two-quadrant bridge converter
Circuit schematic diagram can be shown in figure 5.
G
K
STB6
+A
A
B
C
G
+B
+C
-B
-C
K
-A
RCYM * 6
+A
+B
+C
G K G K G K
-A
-B
-C
G K G K G K
1 2 3 5 7 8
J1 A
1 2 4 5 7 8
J2A
1
J4A
5
3
PSHC6S00
4
THREE-PHASE
THYRISTOR
FIRING BOARD
1
220Vac
+5V
SIG
DELAY
COMMAND
COM
I2
J3A 2
OFF
SOFT STOP
ON
5
6
7
OFF
I1
QUICK STOP
+12V
ON
Configuration:
Application:
① Phase reference of 30°
① Power supply
② Pulse range of 2-30°
② DC motor drive
③ Gate delay angle range of 5-130°
④ Phase reference from SCR cathode
Fig5 Two-quadrant bridge converter
Figure 6 is schematic diagram for voltage stabilizing and current limiting control, Vd for given
voltage, Id for given limiting value, Vf, If are feedback signals of voltage and current.
8
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
VDD
FILTER
+ YT
LM324
-
VD
Vf
PSHC6S00 INTERFACE
VOLTAGE REGULATOR
+
-
CURRENT REGULATOR
Id
FILTER
If
FILTER
SIG
C
FILTER
VDD
6.2k
LM324
C = 0.01~33μF
LT
+
LM324
-
COM
Fig 6 Voltage stabilizing and current limiting control circuit
Figure 7 shows the soft start and stop control circuit, the potentiometer is given one, such as the
voltage-given potentiometer in figure 6; I 2 is the soft stop control of PSHC6S00 firing board, the
firing board begin to soft stop when it is low level and the trigger pulse delay angle go to the
maximum value from the original value in a certain speed; the firing board begins to soft start when
it’s not connected and the move of the trigger pulse is just the opposite of the former. When the
switch is in the position of SS (soft start), the voltage in terminal Vdh of potentiometer rises in a
certain slope and stops until it reach a fixed value. When the switch is in the position of S(soft stop),
the voltage in the terminal Vdh falls in a certain slope and stop until it reach to zero.
Fig 7 Soft stat and stop control circuit
The design of regulator of dc motor voltage & speed regulating system can be shown in figure 8.
In the figure Nd, Nf, Id, if separately stands for given motor speed, speed feedback, given current
and current feedback. The given potentiometer connect with the soft start and stop circuit according
to the label in the brackets when the soft start and stop control circuit is used.
In order to improve the reliability, a differential correction circuit in feedback loop can be
paralleled. Adding current self-adaptation can improve the stability of motor while it is in condition
of low speed operation. There would be stable tracking changes in DC motor when adjusting given
speed potentiometer. When the given value is a fixed one, the motor would operate stably in
corresponding speed.
9
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
In figure 8, Rb1 and Rb2 are bias resistors and the power supply. Vdd supply bias voltage by two
resistors without bias resistor, the motor would soft start and has an abrupt speed, which was
forbidden in many occasions. The adding of bias resistor solves the problem successfully.
Fig 8 The principle of regulator of dc motor speed &current double closed-loop regulating system
10
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
2. Four-quadrant bridge converter
The schematic diagram shown in figure 9, it contains two independent full-control bridge loops
#1 and #2. The main firing board and assistant firing board of PSHC6S00 supply trigger pulse
separately and make the motor operate in four-quadrant by adjusting the control of the circuit. The
circuit operates in a non-circulating mode.
Suppose α1 β1 α2 β2 separately as rectifier angle and inverter angle of bridge #1, rectifier angle
and inverter angle of bridge #2. In condition of α1<π/2, the motor absorbs energy from power
network through bridge #1 and works in the first quadrant while bridge #2 was blocked.
You should change the direction of armature current to make the motor brake rapidly if you want
it operate reversely. Block bridge #1, then open bridge #2, when β2<π/2, bridge #2 operate in reverse
state, and the motor operate in the second quadrant forwardly. You should adjust β2 to make it
become bigger until β2=π/2(the speed is zero) with the fall of the motor speed in order to ensure the
motor have enough electromagnetic torque in the process of brake.
With the finish of braking, increase β2, to make α2<π/2 and bridge #2 be in the rectifier state, the
motor begins to enter the third quadrant power state by inversion and absorbs energy from power
network. Then the motor turn to inversion from forward.
When the motor reverse, block bridge #2, make bridge #1 operate in reversion state and β1<π/2,
then the motor operate in the fourth quadrant in a reversal way. Similarly, β1 increase gradually, the
speed of motor is zero β1=π/2 and the reversal brake finished. When β1 continue to increase, α1<π/2,
bridge #1 work in rectifier state, the motor goes into the first quadrant forward move.
When designing the control circuit of four-quadrant bridge converter, the following attention
should be taken into consideration. The gate pulse nearby turning point must be kept in block to
avoid the bridges switching on at the same time when the direction of the load current changed, that
is why the inhibit circuit is demanded. And it can be realized by controlling the prohibit function of
the main firing board.
Figure 10 is a kind of inhibit circuit. The forward and inversion command can be controlled by
the switch and can be replaced by the digital signal which is the input signal of the circuit.
Based on the above analysis, the circuit should contain below functions: Suppose the motor
move forward, now we want to change it to move backward. On detecting the forward and backward
signal, the circuit output a signal to control the inhibit function terminal I1 of the firing board,
making the terminal be in a low level at a certain time, then block the trigger pulse of bridge #1. The
thyristor of bridge #1 will shut off safely after a suitable delay time. The level of the other output
signal changes correspondingly with the transformation of the forward and backward signal, which
controls the selected signal P of the firing board and makes the other output pulse be selected. And
the pulse would take effect once the circuit is conducted. At the same time, there is no pulse signal
exists in the output terminal which were in operation state until the selected signal P transform to
forward state and the inhibit signal take no effect.
In the figure, double single stabilizing circuit U1 generates single stabilizing positive pulse for the
rising and dropping of input current, makes the timing circuit U2 has the effect of delaying the time,
and outputs positive pulse to U1 and positive pulse with certain width to U2 by U3A makes the
terminal I1 be low level by U and B makes signal P in control by U3. The output U2 trigger single
stabilizing circuit U4 to reset U3 and the inhibit state being unlocked.
11
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
BRIDGE
G K
+A1
A
B
C
#1
+B1
BRIDGE
-A 2
+C1
#2
-B2 -C2
K G
LOAD
G K
-A1
-B1
+A2 +B2 +C 2
K G
-C1
220Va
c
+5V 7
DELAY
COMMAND
COM
11
PSHC6S00
12
THREE-PHASE
THYRISTOR
MAIN
FIRING BOARD
I2
COM
POSITIVE
POLARITY
P
REVERSE
OFF
ON
J4
10
ON
QUICK STOP
J3
5
SIG
SOFT STOP
OFF
1
I1
+12V
8
5
4
6
J9
1
8
1 +A g
1
J1 2
k
g
4
+ B1
5
k
g
7
+ C1
8
k
g
1
− A1 k
2
g
4
J2
−
B
1
5
k
g
7
−
C
1
8
k
J1 1 + A2
2
4
+ B2
5
PSHC6S00
7
+ C2
THREE-PHASE 8
THYRISTOR
ASSISTANT
FIRING BOARD1
J4
8
g
k
g
k
g
k
g
k
2
g
J 2 4 − B2
5
k
g
7
− C2
k
1 8
− A2
Configuration:
Application:
①
Phase reference of 30°
②
Pulse range of 2-30°
③
Gate delay angle range of 5°-130°
④
Phase reference from SCR cathode
① DC motor reversible drive
②Three-phase to single-phase frequency converter
Fig 9 Four-quadrant bridge converter
12
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
Fig10 The timing inhibit circuit of motor forward and inversion shift control
3. AC controller
The schematic diagram can be shown in figure 11.
The load can attain a variable amplitude three-phase ac voltage by changing the gate delay
angle of thyristor and the load can be in a stable control state by composing close loop with added
voltage or current regulator.
The current limiting start and energy saving control system of asynchronous motor had been
developed successfully by using the circuit and the added regulator.
It can realize temperature control of the load if it is three-phase symmetry resistance load, such
as resistor heater.
4. Induction generator controller
The induction generator were widely used for wind power generation own its advantage of
simple network-connect control, avoiding oscillation and loss of synchronization comparing with
synchronous motor. But because of the randomness of wind power, the wind power generator must
be connected and unconnected power network frequently and the impulse current generated by
which effect the quality of the power. There is too much energy loss because the generator usually
operates below rated power, which reduces the efficiency of the generator .The schematic diagram
of wind power induction generator control system shown in figure 12.
The automatic synchronous control system of controlling of wind power generation grid
integration operates in a bigger thyristor gate delay angle. It resolves the above problem by taking
advantage of the connection between of generator impedance and thyristor to make the voltage in
generator raise with the external torque supplied by the wind power.
When the speed of generator reach to synchronous speed, control machine make the speed
switch open which make the generator begin to soft grid-integration to generate power. The
generator realize the grid connected and unconnected in a low voltage, thus limit the impulse current
and oscillation when the generator is grid-unconnected. When the speed of generator is low but still
higher than the synchronous speed and the excitation loss of generator is reduced because of
thyristor control, the generator can still transform more power to the network. The generator can get
the whole network voltage when there is a high speed.
13
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
5. Double reverse star rectifier
Double reverse star rectifier are widely used in the occasion of low voltage and high current
load, the schematic diagram shown in 13, and it actually made up of two three-phase half-wave
circuits.
The balancing reactor IPT balance the potential difference of two groups of three-phase
half-wave rectifier circuits, making them operate independently. The two groups of circuit operate in
parallel at any time to support the load together, thus supply a bigger load current.
G K
A
-A
+A
B
-B
+B
C
Configuration:
① Phase reference of 0°
② Wide pulse of 120°
③ Gate delay angle range of 5-175°
④ Phase reference from SCR cathode
-C
+C
Application:：
① AC control
② Reduced voltage starting of three-phase
asynchronous motor
③ Resistive heater
Fig 11 AC controller
14
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
We can see from the figure ， it is a different application of firing board compared to
above-mentioned application. In the former circuit, the firing board attain synchronous signal by
sampling the cathode signal of thyristor which connect with power supply, thus output correct trigger
pulse. But in the star rectifier circuit, there is a three-phase synchronous signal introduced from the
ac power side because the cathode of the thyristor is not connect with the power supply.
We can get a conclusion from the principle of star rectifier circuit that phase reference of all
thyristors is 30°as for the connected power(that is the secondary side of the transformer ), and the
phase reference of the firing board is 0° because the △/Y in transformer has a phase-shift of 30°.
J2 -1 2
K
G
A'
-A
C'
J2 -4 5
CT1
J1
G
3
1
J2
+A
A
IPT
J1 -4 5
K
G
-B
K
+B
3
B
J2 -7 8
1
J3
3
G
J1 -7 8
K
G
-C
1
K
+C
C
TRANSIENT INHIBITION
BOARD
MOTOR
DETECTION
ENABLING
STATE
BIAS
MOTOR
INTERFACE
BOARD
J1
5
J2
1 4
6
+B
+C
-A
-B
-C
1 2 4 5 7 8 1 2 4 5 7 8
J1
J2
1 J
6
PSHC6S00
1 2 3
J3
J4 1
20
20
2 3
MOTOR
ENABLING
DETECTION
G K
G K
+A
GROUND
50Hz
B'
ENABLING
400V
J1 -1 2
G
K
THREE-PHASE THYRISTOR
FIRING BOARD
J3
J4
8
11
3
5
+12V
220Vac
SPEED SWITCH MOTOR SWITCH
CONTROL SINGLE CHIP
MICROPROCESSOR
Configuration:：
① Phase reference of 0°
② Wide pulse of 120°
③ Gate delay angle range of 5-175°
④ Phase reference from SCR cathode
Fig12 The control system of wind power induction generator network
15
G
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
Configuration:
Application:
① DC motor drive
① Phase reference of 0°
② Pulse range of 2-30°
③ Gate delay angle range of 5-160°
④ Phase reference from AC power
② Plating power supply
Fig13 Double reverse star rectifier
16
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
Handling
1. Remove the package, take the firing board, AMP plug-in and insert pin and other accessories out.
2.Select the required jack position of J1~J4 by the designed method, connect suitable length 16-20
multi-chip soft wires with the AMP plug-in by soldered pressure or special crimp tool, and then
make the jacks well positioned from the back of AMP plug-in.
3. Connect J1, J2 which corresponded to 12 leads of 6pcs SCR with gate and cathode according to
the standard circuit connection diagram.
The connecting leads should be less than 50cm And each pair of leads (the gate and cathode of
the same SCR) should be twisted per 25 cm at least, which can reduce interfere of high-frequency
clutter .The leads of 3 SCR cathode -A、-B、-C introduce synchronous signal at the same time, so the
leads must be corresponded one by one.
J3 was used to connect with the other control circuit. The terminal⑩ (SIG) input the dc control
voltage range 0~5V to make the conduction angle of SCR change from minimum to the maximum.
When the terminal ⑿ （I2）short bridged to grounded, it begins to soft stop. And when the terminal
④（I1）and 12V are in open condition, it generates quick stop(block pulse). Additionally, please refer
above-motioned figure 5 circuit as for the terminal ⑥ （+12V）,terminal ⑧ （COM）and so on(Here
and the following terminal marks are the corresponded ones of PSHC6S00 and can be used
according to the description of the terminal).
J4 is the input interface of 220V AC power (or 380W) when there is power transformer in PCB.
Ensure the voltage is corresponded to the voltage of transformer.
4.The installation hole size of standard board PSHC6S00 can be shown in figure 14. In the figure,
jack J1A、J2A、J3A replace J1、J2、J3 separately in PSHC6S00, and the corresponding signal J3 can be
shown in the figure.
5. Please make sure all connections correct by checking the figure, otherwise, wrong connection may
damage the circuit or the devices. Please contact with us if you have any questions.
6.Conduct the AC voltage in the terminal ①、② of J4 or J3 to make the board get a ac power of 220V
or 24V under the condition that SCR not connect with three-phase power supply. The three LED
indicators board power indicator (green), lack-phase indicator (red) and the inhibit indicator should
lights.
7. Verify the given voltage (terminal J3⑩) is zero and connect the three-phase voltage. Make the
three-phase voltage to a rating value at one time rather than increase it by booster gradually and the
error limited to ±20% of rating voltage. At this time two red LED should go out.
8. Increase the given voltage gradually and the output SCR (detected by voltmeter and oscilloscope)
change correspondingly to a correct value, by then the installation realized basically.
9.In non-standard circuit application, when primary side of transformer and synchronous transformer
are in synchronous state, all SCR gates should be turn-off first, and examine the SCR anode,
corresponding pulse phase place and phase-sequence by oscilloscope, and connect the gate when no
mistakes exist.
10. The only adjustable switch PP1 in the firing board determines the required trigger pulse. The
pulse reference phase is 0° when 1, 2, 3 is off and 4, 5, 6 is on. The trigger pulse is 120°when 7 and
8 is on. It will have a trigger pulse of 2-30° when 7 and 8 are both on and it should be double narrow
pulse (interval of 60°) when 7 and 8 is both off.
11. To improve the reliability of firing board and prevent the set condition of switch PP1 being
17
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
~
5V
SIG
I1
12V
COM
I2
changed because of accidental cause (such as the uses), the type of pulse are be fixed completely by
welding short lead in PSHC6S00 firing board to replace PP1 combination state to meet with
different demand of users. You can refer to the datasheet or contact us to change correspondingly if
different pulse forms are needed.
12. The voltage level of main circuit and application which adopted by the firing board should be
explained clearly when making an order.
Fig14 The schematic diagram of jacks and position of PSHC6S00 thyristor firing board
18
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
Appendix
1. Main technical parameters of the firing board.
(1)When the voltage of the two phases is above 20% of the normal value and the other is less than
20%, the imbalance of pulse is less than 1°.
(2)With the pulse front steepness of 15A/US ,it can trigger the thyristor of 2000A reliably.
(3)The power consumption of the firing board is less than 10W.
(4)The whole firing board is an inertial first-order system and the time constant is 6mS.
(5)The firing board can operate normally when the range of secondary-side voltage is 280-480V if
the sampling resistor in the board in not changed and if you change the sampling resistor
properly, the range of voltage can be further widened.
(6)The isolation voltage of pulse transformer can be up to 3000V.
(7)12-48 additional board of pulse transformer or firing board secondary-side double winding can
be used for triggering higher power thyristors in series or paralleling.
2. Introduction of PSHC12S00 and PSHC2S00
On the basis of PSHC6S00, the six-phase and single-phase general firing board of PSHC12S00
and PSHC2S00 were developed continually.
(1)PSHC12S00 thyristor firing board PSHC12S00
On the basic of PSHC6S00, PSHC12S00 thyristor firing board has the three-phase thyristor
assistant trigger circuit which can output 12 gate trigger pulse to trigger two groups of three-phase
full bridges. The basic working principle of it is the same as PSHC6S00, it forms linearity between
the output gate pulse delay angle and dc control voltage signal, and it also inherits all advantages of
PSHC6S00 three-phase general thyristor firing board PSHC12S00.
Figure A-1 is the schematic diagram of PSHC12S00 the A, B, C of J4 connects to A, B, C of
main circuit through J2+ and it is not the same as in the double reverse star circuit.
Figure A-2 is the schematic diagram of jacks and direction of PSHC12S00.
PSHC12S00 makes full use of the control function of signal P compared with PSHC6S00
three-phase general thyristor firing board. When the signal P is high level, jack pins J1+、、J2 of firing
board output trigger pulse and J1-、J2 have no output signal; when the signal P is low level, the
trigger pulse outputted by jack pins J1+、J2 of firing board disappear and J1-、J2 output corresponding
trigger pulse. So the board is suit for triggering four-quadrant bridge convertor, such as the no
circulation control mode of reversible dc motor driver (that is positive reversion) and the two-phase
or single-phase frequency transform circuit.
There must be a inhibit circuit In the process of pulse switch; it avoids two bridges switch at the
same time to result into short circuit. But different parameters should be adopted as for different
loads when setting inhibits circuit. You can set a current-zero-crossing detection inhibit circuit in
order to improve the generality of control system. It does current-zero-crossing detection to the main
circuit and switches trigger pulse after getting a zero-crossing signal. The design is similar to
application of PSHC6S00 in four-quadrant convertor; you can take it for you reference.
12 pulse convertors eliminate 5 times and 7 times harmonic wave of power current the traditional
trigger circuit gets 12 gate pulse signals from the two independent delay generators, while
PSHC12S00 can do it just by one delay generator through the control function of signal P.
19
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
+ A1
+ B1
+ C1
− A2
− B2
− C2
− A1
− B1
− C1
+ A2
+ B2
+ C2
+ A1 + B1
− A1 − B1
J1+
J 2+
− C1
J4
I2
J3
I1
J 2−
J1−
+ A2 + B2 + C2 − A2 − B2 − C2
Configuration：
Application：
① Phase reference of 30°
① DC motor reversible driver
② Pulse range of 2-30
② three-phase to single-phase
frequency converter
③ Gate delay angle range of 5-130°
④ phase reference from SCR cathode
Fig A-1 PSHC12S00 firing board application
20
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
J 2+
J1+
J7
J4
J10
J6
J3
I1
I2
J 2−
J1−
Fig A-2 PSHC12S00 connectors place instruction
21
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
(2).PSHC2S00 thyristor firing board
PSHC2S00 output 2 pulses, used for trigger of thyristor in single-phase half-control bridge.
For the 0-5V change of DC control voltage SIG, the gate delay angle of output thyristor gate delay
angle linear changes within the range of 0º~180º in order to control phase-shift.
PSHC2S00 inherits all advantage of PSHC6S00 firing board.
①.Construction:
Connector place instruction
J1：
Terminal 1, 2 is trigger pulse output g1, k1, terminal 3 is not connected.
Terminal 4,5 is trigger pulse output g2、k2, the discrepancy between 2 pulses is 180°.
J2：
Terminal 1, 5 connect with AC 220V, power supply LED lights. If use 380V, power supply transfer
should be changed, and input synchronic signal at the same time (refer to next page).
Terminal 2, 3, 4 are not connected.
J4：
Terminal 1 is +15V output stage.
Terminal 2 is inhibit signal input stage, should be connect with ground（com), pulse blocked, inhibit
LED D5 lights; Not connected, trigger pulse shifted from minimal conduct angle to required
conduct angle that is soft starting function.
Terminal 3 is +12V output stage.
Terminal 4 is control signal input stage 0～5V control voltage input by PI adjustor, make conduct
angle of thyristor adjustable from 0～175°.
Terminal 5 is GND（com).
22
Principle and Application of PSHC6S00
General Digital Thyristor Firing Board
②.Application:
1．
Remarks: In this connection,
thyristor is below, g1,k1, g2,k2
correspond to left, right thyristor
respectively; short-circuit leads
L1,L2 connect to the place of 2
&3;Then synchronization
automatically, no needs to input
synchronic signal to connector J’s
terminal 1&5.
If short-circuit leads L1,L2 connect
to the place of 1&2,then synchronic
signal should be input:
① Connect to J2-5,
② Connect to J2-1.
2．
Remarks: In this connection,
thyristor is above,g1,k1 , g2,k2
correspond to left, right thyristor
respectively; then no
synchronization automatically,
+
k1
1
short-circuit leads L1、L2 connect to
the place of 1 &2; Synchronic signal
should be input to J2’s terminal of
1,5:
①
②
g1
k2
g2
DC OUTPUT
AC INPUT
2
_
Connect to J2-2,
Connect to J2-4.
3
k1
Remarks: In this connection,g1,k1 ,
g2、k2 correspond to top bottom
thyristor respectively; short-circuit
L1、L2 connect to the place of 1 &
2;then no synchronization
automatically, synchronic signal
1
AC INPUT
220V OR 380V
2
should be input to J2’s terminal 1、5:
①
Connect to J2-1,
②
Connect to J2-5.
g1
g2
23
k2
AC OUTPUT