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Department of Power Electronics and Electric Drives
VSB – Technical University of Ostrava
Czech Republic
Pulse Rectifiers Current-Type
for Applications in Modern
Frequency Converters
Pavel HLISNIKOVSKÝ
Petr CHLEBIŠ
Advantages of the Pulse Rectifier Current-Type
Sinusoidal current consumption from the mains.
Power factor can be set in wide range, so the pulse rectifier
can perform the function of the compensators itself.
Minimisation of the sizes and also the price of the chokes at
the input side of the converter.
There is not a dangerous effect of not passed commutation
as it is in phase controlled rectifiers.
Small distance-velocity lag of the converter given by high
frequency of the modulation (VPWM or delta modulation).
The lower ripple of the output rectified DC current. It
enables to use a smaller smoothing choke at the DC side.
The converter retains its preferences even at the deformed
voltage in the mains.
Power Part of the Three Phase Pulse
Rectifier Current-Type
S
Fast diode
leakage inductance
of the transformer
3x L 
+
S1
S3
S5
L1
UDC
L2
L3
C1 C2 C3
capacitor
battery
I DC
S4
S6
S2
Power Part of the ZCS Indirect
Frequency Converter Current-Type
L DC
S11
S13
S15
CR
I DC
S22
S26
S24
L1
L21
L2
L22
L SAT
LR
L3
C11 C12 C13
L23
S14
S16
S12
S25
S23
S21
C21 C22 C23
Vector Pulse Width Modulation
Im
inscribed
circle
S1,S2 i2 the left vector
of the sector no. s0
i03
S2,S3
i3
i01 the zero vector
of the sector no. s0
s0
s1
I DC
i1 S6,S1
the right vector
of the sector
no. s0
60°- 

s2
s5
30°
i02
I DC max
s2
60°
i4
S3,S4
s3
i6 S5,S6
i03
i5 S4,S5
Re
s5
s4
i01
i02
Delta Modulation
The principle for the Input Unit:
The calculation of the differences between desired and real
instantaneous values of the input phase currents.
The determination of the switching combination of the
next period for minimizing the differences.
The principle for the Output Unit:
The calculation of the differences between desired and real
instantaneous values of the output phase voltages.
The determination of the switching combination of the
next period for minimizing the differences.
Measured Results – Input Part
Phase current and phase voltage with
leading power factor cosφ = 0.86
Phase current and line voltage with
leading power factor cosφ = 0.86
Measured without additional smoothing
chokes at the input side of the converter
Measured with small smoothing chokes
at the input side of the converter
Measured Results – Input Part
Phase current and phase voltage with
unite power factor
Phase current and phase voltage with
lagging power factor cosφ = 0.86
Measured without additional smoothing
chokes at the input side of the converter
Measured without additional smoothing
chokes at the input side of the converter
Measured Results – DC link and Output
Resonant current pulses in the DC link
of the indirect frequency converter
using the zero current switching
Output phase voltage (up) and output
phase current (down) of the ZCS
indirect frequency converter currenttype with loaded Induction Motor
Realized Physical Model of the
Three Phase Pulse Rectifier Current - Type
Awarded by
SIEMENS
OUTPUT:
IDC = 10A
UDC = 550V
Realized Physical Model of the
ZCS Indirect Frequency Converter Current-Type
CZECH REPUBLIC
DEPARTMENT