Bipolar Junction Transistors (BJT)
... • The equation above shows that the BJT is indeed a voltagedependent current source; thus it can be used as an amplifier. ...
... • The equation above shows that the BJT is indeed a voltagedependent current source; thus it can be used as an amplifier. ...
Input-current-shaper based on a modified SEPIC
... will be a reality. The limits on the current harmonics imposed by EN61000-3-2 have been one of the driving forces in the past decade concerning research in the field of Power Factor Correction (PFC) and Input Current Shaping (ICs). For many applications, the main goal is not to achieve unity Power F ...
... will be a reality. The limits on the current harmonics imposed by EN61000-3-2 have been one of the driving forces in the past decade concerning research in the field of Power Factor Correction (PFC) and Input Current Shaping (ICs). For many applications, the main goal is not to achieve unity Power F ...
PDF Version
... Effective short-circuit protection became possible with the BBC produced a static PPX110/111 (Fig. 6) in the 1970s. introduction of differential protection. First developments This relay was used for supervision and tripping of generators, and the usage for transformer and line protection have been ...
... Effective short-circuit protection became possible with the BBC produced a static PPX110/111 (Fig. 6) in the 1970s. introduction of differential protection. First developments This relay was used for supervision and tripping of generators, and the usage for transformer and line protection have been ...
Features of the high-side family IPS60xx
... no protection ( temperature or current ) is active during this mode. The designer must check such that in the worst condition of current and temperature, the power dissipated during the turn off is within the SOA of the IPS. Purpose of the active clamp When switched OFF, an inductive load generates ...
... no protection ( temperature or current ) is active during this mode. The designer must check such that in the worst condition of current and temperature, the power dissipated during the turn off is within the SOA of the IPS. Purpose of the active clamp When switched OFF, an inductive load generates ...
Electric Furnace
... electrode currents due to their circuit topology. For instance, if only one of the electrodes is moved, all three electrode currents will change simultaneously. The current couplings make the impedance and power control of three-electrode furnaces more difficult. Novel decoupling techniques are curr ...
... electrode currents due to their circuit topology. For instance, if only one of the electrodes is moved, all three electrode currents will change simultaneously. The current couplings make the impedance and power control of three-electrode furnaces more difficult. Novel decoupling techniques are curr ...
Issues, Models and Solutions for Triac Modulated Phase Dimming of
... presented in Fig.4. The dimmer block in the figure is represented by the detailed dimmer switch model in Fig. 3.When used with a dimmer switch, the charging current of the filter capacitor is limited by the dimming resistance R1 (inside the dimmer, see Fig. 2) and is Icharge = (Vin – Vload – Vc1)/R1 ...
... presented in Fig.4. The dimmer block in the figure is represented by the detailed dimmer switch model in Fig. 3.When used with a dimmer switch, the charging current of the filter capacitor is limited by the dimming resistance R1 (inside the dimmer, see Fig. 2) and is Icharge = (Vin – Vload – Vc1)/R1 ...
Auxiliary coil and exciter equipped with permanent magnets
... terminals, WEG alternators are equipped with a voltage regulator, which controls the generator excitation according to the result of the comparison between the measured voltage and the reference value. The auxiliary coil works as the voltage source for this voltage regulator. For this, it receives t ...
... terminals, WEG alternators are equipped with a voltage regulator, which controls the generator excitation according to the result of the comparison between the measured voltage and the reference value. The auxiliary coil works as the voltage source for this voltage regulator. For this, it receives t ...
Solutionto QuestionBank
... For more than two resistors connected in parallel a more difficult equation must be used. This adds up the reciprocal ("one over") of each resistance to give the reciprocal of the combined resistance, R: ...
... For more than two resistors connected in parallel a more difficult equation must be used. This adds up the reciprocal ("one over") of each resistance to give the reciprocal of the combined resistance, R: ...
PDF
... independently of the type of fault or any event that happens in the system, provided that the whole system remains connected to the supply grid, i.e. the line breaker does not trip. For most practical cases, a more economical design can be achieved by only compensating the positive and negative sequ ...
... independently of the type of fault or any event that happens in the system, provided that the whole system remains connected to the supply grid, i.e. the line breaker does not trip. For most practical cases, a more economical design can be achieved by only compensating the positive and negative sequ ...
AN2794
... Schematic of the auxiliary power supply section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Characteristic waveforms (measured at 24 V input voltage and 280 W resistive load) . . . 25 Characteristic waveforms (measured at 28 V input voltage and 1000 W resistive load) . . 25 MO ...
... Schematic of the auxiliary power supply section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Characteristic waveforms (measured at 24 V input voltage and 280 W resistive load) . . . 25 Characteristic waveforms (measured at 28 V input voltage and 1000 W resistive load) . . 25 MO ...
Designing Non-Invert Buck-Boost (Zeta) Cnvrts
... Figure 1. COT regulators do not require loop compensation and provide excellent transient performance with minimum design effort. Nonsynchronous operation results in reduced switching frequency at a very light load which delivers higher efficiency than a comparable fixed frequency converter. In many ...
... Figure 1. COT regulators do not require loop compensation and provide excellent transient performance with minimum design effort. Nonsynchronous operation results in reduced switching frequency at a very light load which delivers higher efficiency than a comparable fixed frequency converter. In many ...
isl9204 - ISL9204 - High Input Voltage Charger
... below a typical 2.8V trickle-charge threshold, the ISL9204 charges the battery with a trickle current until the battery voltage rises above the trickle charge threshold. When the battery voltage reaches 4.2V, the charger enters a CV mode and regulates the battery voltage at 4.2V to fully charge the ...
... below a typical 2.8V trickle-charge threshold, the ISL9204 charges the battery with a trickle current until the battery voltage rises above the trickle charge threshold. When the battery voltage reaches 4.2V, the charger enters a CV mode and regulates the battery voltage at 4.2V to fully charge the ...
3-in-1 Current Transformers
... installation time where fitting three standard individual current transformers would be required. The M3N1 range of current transformers offers primary currents between 60-630A with 5A secondaries with up to class 0.5 accuracy performance. ...
... installation time where fitting three standard individual current transformers would be required. The M3N1 range of current transformers offers primary currents between 60-630A with 5A secondaries with up to class 0.5 accuracy performance. ...
Transformer TheoryPDF
... • Hysteresis loss is due to residual magnetism which remains after the magnetizing force is removed • Occurring every half‐cycle, hysteresis loss is the energy required to reduce the residual magnetism to zero • Eddy current flows in the transformer’s core and results from the induced voltage in ...
... • Hysteresis loss is due to residual magnetism which remains after the magnetizing force is removed • Occurring every half‐cycle, hysteresis loss is the energy required to reduce the residual magnetism to zero • Eddy current flows in the transformer’s core and results from the induced voltage in ...
Aalborg Universitet Hybrid power filter with reduced inverter power rating
... However, the filter iF current RMS value differs depending on applied topology. For the APF it is iF=4A and for hybrid devices its value is iF=6A (see Table 3). The difference in values comes from the fact that APF current contains less fundamental frequency component. That is because of the fundam ...
... However, the filter iF current RMS value differs depending on applied topology. For the APF it is iF=4A and for hybrid devices its value is iF=6A (see Table 3). The difference in values comes from the fact that APF current contains less fundamental frequency component. That is because of the fundam ...
What is LDO (Low-Dropout Voltage Regulator) 2006/6 John Wu 吳旻翰
... (A) “Classic” NPN-based regulators that require 2.5 to 3V of excess input voltage to function.7805,317,340 (B) “Low Dropout NPN” regulators, with a NPN output but a PNP base drive circuit. These devices reduce the dropout requirement to 1.2 to 1.5V. (C) True low dropout PNP-based regulators that nee ...
... (A) “Classic” NPN-based regulators that require 2.5 to 3V of excess input voltage to function.7805,317,340 (B) “Low Dropout NPN” regulators, with a NPN output but a PNP base drive circuit. These devices reduce the dropout requirement to 1.2 to 1.5V. (C) True low dropout PNP-based regulators that nee ...
BD555A1AFV
... 4) AUX Low Voltage Detection When AUX power supply voltage is low or any abnormal problem occurs such as AUX pin short, IC is turned non-active, since there is a possibility that IC does not operate properly. In non-active mode, switching operation stops. Gate driver output turns into low impedance ...
... 4) AUX Low Voltage Detection When AUX power supply voltage is low or any abnormal problem occurs such as AUX pin short, IC is turned non-active, since there is a possibility that IC does not operate properly. In non-active mode, switching operation stops. Gate driver output turns into low impedance ...
GENERATED VOLTAGE CONTROL IN A SWITCHED
... capability, but they can work in this condition after being provided with excitation requirements during starting. An auxiliary external battery or small permanent magnets conveniently inserted in the stator poles [9] can be used for the purpose of offering initial conditions for generated voltage b ...
... capability, but they can work in this condition after being provided with excitation requirements during starting. An auxiliary external battery or small permanent magnets conveniently inserted in the stator poles [9] can be used for the purpose of offering initial conditions for generated voltage b ...
280-20
... Types D and DV reclosers are hydraulically controlled protective devices in which tripping is initiated by a series-trip coil that releases the stored-energy trip mechanism when an overcurrent occurs. Current carrying and interrupting capacities depend on the current rating of the series trip coil. ...
... Types D and DV reclosers are hydraulically controlled protective devices in which tripping is initiated by a series-trip coil that releases the stored-energy trip mechanism when an overcurrent occurs. Current carrying and interrupting capacities depend on the current rating of the series trip coil. ...
Gauss`s Law - KCSE Online
... construction simply involves insulating two conductors from each other. Storing electric energy in the device, involves transferring charge from one conductor to the other such that one has a negative charge while the other has an equal amount of positive charge. Work must be done to move the charge ...
... construction simply involves insulating two conductors from each other. Storing electric energy in the device, involves transferring charge from one conductor to the other such that one has a negative charge while the other has an equal amount of positive charge. Work must be done to move the charge ...
Mercury-arc valve
A mercury-arc valve or mercury-vapor rectifier or (UK) mercury-arc rectifier is a type of electrical rectifier used for converting high-voltage or high-current alternating current (AC) into direct current (DC). It is a type of cold cathode gas-filled tube, but is unusual in that the cathode, instead of being solid, is made from a pool of liquid mercury and is therefore self-restoring. As a result, mercury-arc valves were much more rugged, long-lasting and could carry much higher currents than most other types of gas discharge tube.Invented in 1902 by Peter Cooper Hewitt, mercury-arc rectifiers were used to provide power for industrial motors, electric railways, streetcars, and electric locomotives, as well as for radio transmitters and for high-voltage direct current (HVDC) power transmission. They were the primary method of high power rectification before the advent of semiconductor rectifiers, such as diodes, thyristors and gate turn-off thyristors (GTOs) in the 1970s.