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ZCS-PWM switching unit circuit

A switching unit and circuit technology, used in electrical components, high-efficiency power electronic conversion, output power conversion devices, etc. problems, to achieve the effect of low voltage stress and current stress, simple and convenient control, and small electromagnetic interference

Inactive Publication Date: 2007-01-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hard-switching PWM converters using IGBTs as switching elements have some disadvantages in high-voltage and high-power applications: (1) Due to the relatively slow switching speed of IGBTs, the operating frequency of the converter is not easy to increase, and the volume and weight of magnetic components (2) Due to the non-ideal switching behavior of the switching state of the power electronic device and the effects of circuit parasitic and distribution parameters, the power electronic device has a hard switching effect in the switching transient state, that is, during the switching transition process, Not only do the voltage and current waveforms have high rate-of-change spikes, but they also have a large overlap
[0011] Disadvantages of scheme 1: the main switch tube S 1 with resonant inductance L r Directly connected in series, the current stress in the main switch tube is very large, the on-state loss is large, and the rating of the select switch tube is increased, which increases the cost; in addition, the L r Directly connected in series in the main switch circuit, the on-state voltage drop is very large, which affects the improvement of the efficiency of the converter
[0012] Disadvantages of scheme 2: the auxiliary branch of this converter is connected in parallel with the main switch circuit, its operation will not increase the voltage stress and current stress of the main switch tube, and the voltage stress and current stress of the main switch tube are very small
However, the resonant inductor is connected in series in the main switch circuit and the auxiliary branch circuit, and the loss is large
[0013] Disadvantages of scheme 3: the auxiliary branch of this converter is connected in parallel with the main switch circuit, and the resonant inductance is moved to the freewheeling branch, so the voltage stress and current stress of the main switch tube are small and the loss is small
However, the existence of two resonant inductors makes the structure of the converter not very simple. In addition, the voltage stress and current stress of the auxiliary switch tube are very large, and the resonant inductor bears a very large back pressure during the reverse resonance stage.

Method used

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  • ZCS-PWM switching unit circuit

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Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: as Figure 4 , Figure 5 As shown in (a), (d) and (f), the ZCS-PWM switch unit circuit of this embodiment includes a main switch circuit and an auxiliary branch circuit, wherein the main switch circuit includes a main switch tube S 1 and with the main switch S 1 Anti-parallel diodes, the auxiliary branch includes the auxiliary switch S 2 , auxiliary switch tube S 2 There is a resonant branch connected to the emitter of , which includes a series resonant inductor L r and auxiliary diode D 2 , auxiliary diode D 2 There is a capacitor C in parallel r , auxiliary diode D 2 The cathode and resonant inductance L r connection, the main switch S 1 The emitter and auxiliary switching tube S 2 between the emitters of the main diode D 1 ; with the auxiliary switch tube S 2 The emitter connected branch has a clamping diode D in parallel 3 . clamping diode D 3 The cathode and auxiliary switching tube S 2 The emitter is connected to the anode with the au...

Embodiment 2

[0033] Embodiment 2: As shown in Figure (5)(c), this embodiment is a ZCS-PWM switch unit circuit of another structure, including a main switch circuit and an auxiliary branch circuit, wherein the main switch circuit includes a main switch tube S 1 and with the main switch S 1 Anti-parallel diodes, the auxiliary branch includes the auxiliary switch S 2 , the main switch S 1 There is a resonant branch connected to the emitter of , which includes a series resonant inductor L r and auxiliary diode D 2 , auxiliary diode D 2 There is a capacitor C in parallel r , auxiliary diode D 2 The negative pole and the resonant inductance L r connection, the main switch S 1 The emitter and auxiliary switching tube S 2 between the emitters of the main diode D 1 , the main diode D 1 The anode of the main switching tube S 1 The emitter is connected, the cathode is connected with the auxiliary switching tube S 2 The emitter connection; with the main switch S 1 One branch of the emitte...

Embodiment 3

[0034] Embodiment 3: as Figure 5 As shown in (b) and (e), this embodiment is a ZCS-PWM switch unit circuit of another structure, including a main switch circuit and an auxiliary branch circuit, wherein the power circuit includes a main switch tube S 1 and with the main switch S 1 Anti-parallel diodes, the auxiliary branch includes the auxiliary switch S 2 , auxiliary switch tube S 2 There is a resonant branch connected to the collector of , which includes a series resonant inductor L r and auxiliary diode D 2 , auxiliary diode D 2 There is a capacitor C in parallel r , auxiliary diode D 2 The anode and the resonant inductance L r connection, the main switch S 1 and auxiliary switch S 2 between the collectors of the main diode D 1 , the main diode D 1 The anode of the main switching tube S 1 The collector connection, the cathode and the auxiliary switching tube S 2 The collector connection; with the auxiliary switch tube S 2 One branch of the collector connection...

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Abstract

The invention comprises a main switch circuit and an auxiliary branch circuit. Wherein, the main switch circuit comprises a main switch tube and a diode connected to the main switch tube in inverse parallel; the auxiliary branch circuit comprises an auxiliary switch tube; the emitter of the auxiliary switch tube is connected to a resonance branch circuit where a clamping diode is connected in parallel; the cathode of clamping diode is connected to the emitter of the main switch tube, and its anode is connected to the emitter of the auxiliary switch tube. With the circuit based on the invention, a group of direct current converters can be acquired.

Description

1. Technical field [0001] The invention relates to a switch circuit, in particular to a ZCS-PWM switch unit circuit applied to a switch type power converter. 2. Background technology [0002] Compared with power field effect transistors (MOSFETs), insulated gate bipolar transistors (IGBTs) have a smaller turn-on voltage drop and higher rated voltage and current density, so they have been more used in high-voltage and high-power occasions in recent years. . However, hard-switching PWM converters using IGBTs as switching elements have some disadvantages in high-voltage and high-power applications: (1) Due to the relatively slow switching speed of IGBTs, the operating frequency of the converter is not easy to increase, and the volume and weight of magnetic components (2) Due to the non-ideal switching behavior of the switching state of the power electronic device and the effects of circuit parasitic and distribution parameters, the power electronic device has a hard switching ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/527
CPCY02B70/1491Y02B70/10
Inventor 秦岭谢少军
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS