CN201167287Y - Active Clamp High Gain Interleaved Parallel Boost Converter - Google Patents

Abstract

The active clamp high-gain interleaved parallel boost converter disclosed by the utility model includes two power switch tubes, two output diodes, two clamp diodes, two auxiliary power switch tubes, two clamp capacitors, two switched capacitors, an output capacitor and two coupled inductors. The two coupled inductors have two windings respectively. The utility model realizes the high-gain output of the converter by utilizing the second winding of two coupled inductors and two switch capacitors. The two power switch tubes and the The zero-voltage turn-on and zero-voltage turn-off of the two auxiliary switch tubes realize the soft turn-off of the two output diodes and the two clamping diodes by using the leakage inductance of the two coupled inductors. There are no energy loss components in the circuit, which can improve the conversion output gain and circuit efficiency of the converter.

Description

Active Clamp High Gain Interleaved Parallel Boost Converter

technical field

The utility model relates to a DC-DC converter, in particular to an active clamp high-gain interleaved parallel boost converter.

Background technique

A conventional step-up (Boost) interleaved parallel DC-DC converter includes two inductors, two freewheeling diodes, two power switch tubes, the drain of the first power switch tube and the anode of the first diode and One end of the first inductance is connected, the drain of the second power switch tube is connected with the anode of the second diode and one end of the second inductance, and the other end of the first inductance is connected with the other end of the second inductance. The output voltage gain of this step-up interleaved parallel DC-DC converter is small, the voltage stress of the power switch tube is large, the power switch tube works as a hard switch, the switching loss is large, and the reverse recovery current of the freewheeling diode is large , the reverse recovery loss is large. In recent years, some soft switching circuits have been studied successively. There are two main types: one is to realize the soft switching of power switching tubes through additional active power switches and passive inductors, capacitors and other devices; the other is to achieve soft switching of power switching tubes through additional diodes and passive The source inductance, capacitance and other devices realize the soft switching of the power switch tube. Although these two methods can realize the soft switching of the power switch tube, the external circuit is complicated, and the voltage stress of the power switch tube cannot be reduced, and the high gain function of the converter cannot be realized.

Contents of the invention

The purpose of the utility model is to provide an active-clamp interleaved parallel-connected boost converter with high voltage gain, which has small voltage stress of power switch tubes, simple structure, low cost and no energy loss.

To achieve the above purpose, the technical solution of the utility model is that the active clamp high gain interleaved parallel boost converter includes two power switch tubes, two clamp diodes, two output diodes, and two auxiliary power switches tube, two clamping capacitors, two switching capacitors, one output capacitor and two coupling inductors, the first coupling inductor has two windings, the second coupling inductor has two windings, one end of the first winding of the first coupling inductor One end of the first winding of the second coupled inductor is connected to the positive end of the input power supply, the other end of the first winding of the first coupled inductor is connected to one end of the second winding of the first coupled inductor, and the drain of the first power switch tube pole and the source of the first auxiliary power switch tube, the drain of the first auxiliary power switch tube is connected to one end of the first clamping capacitor, the other end of the first clamping capacitor and the source of the first power switch tube are connected to The other end of the first winding of the second coupled inductor is connected to one end of the second winding of the second coupled inductor, the drain of the second power switch tube and the source of the second auxiliary power switch tube, and the second auxiliary power The drain of the switching tube is connected to one end of the second clamping capacitor, the other end of the second clamping capacitor and the source of the second power switching tube are connected to the ground, and the other end of the second winding of the first coupling inductor is connected to the first The anode of the clamping diode is connected to one end of the second switching capacitor, the cathode of the first clamping diode is connected to the anode of the first output diode and one end of the first switching capacitor, and the other end of the second winding of the second coupling inductor is connected to the first The anode of the second clamping diode is connected to the other end of the first switching capacitor, the cathode of the second clamping diode is connected to the anode of the second output diode and the other end of the second switching capacitor, and the cathode of the first output diode is connected to the second output The cathode of the diode is connected to the positive terminal of the output capacitor, the negative terminal of the output capacitor is connected to the ground, the connection end of the first winding of the first coupling inductor and the first winding of the second coupling inductor and the second winding of the first coupling inductor The terminal connected to the drain of the first power switch tube and the source of the first auxiliary power switch tube is the end of the same name of the first coupling inductor; the connection between the first winding of the second coupling inductor and the first winding of the first coupling inductor The connection terminal of the terminal and the second winding of the second coupled inductor, the drain of the second power switch tube and the source of the second auxiliary power switch tube is the terminal with the same name of the second coupled inductor.

When working, the high-gain output of the circuit is realized by using the second winding of the two coupled inductors and the switched capacitor connected in series; , The parallel capacitance existing between the sources realizes the zero-voltage turn-off of the first power switch tube and the second power switch tube; the first clamping capacitor collects the leakage inductance energy of the first coupling inductor, and the second clamping capacitor collects The leakage inductance energy of the second coupling inductor is finally transferred to the input end, realizing the lossless absorption of the clamping circuit. In the whole switching cycle, by controlling the gate pulses of the first power switch tube, the second power switch tube, and the first auxiliary switch tube, the first and second power switch tubes and the first auxiliary switch tube can be turned on at zero voltage. and zero voltage turn off.

The active clamp high-gain interleaved parallel boost converter of the utility model realizes the high-gain output of the converter by using the second winding of two coupled inductors and the switching capacitor connected in series, and utilizes the first auxiliary switch tube and The series circuit composed of the first clamping capacitor and the second auxiliary switching tube and the second clamping capacitor absorbs and transfers the leakage inductance energy of the two coupling inductors losslessly, and realizes the zero voltage of the first and second power switching tubes Turn on, use the parallel capacitance of the first and second power switch tubes to realize the zero-voltage turn-off of the first and second power switch tubes, and use the gates of the first and second power switch tubes and the first and second auxiliary switch tubes Pole arrangement realizes the zero-voltage turn-on and zero-voltage turn-off of the first and second auxiliary switch tubes, without additional inductive components, so there are few additional components, simple structure, low cost, no additional detection circuit, and no energy in the circuit The loss element can improve the output gain and circuit efficiency of the converter, and during the commutation process, there is no voltage overshoot when the power switch tube is turned off, and no current overshoot when the freewheeling diode is turned off.

Description of drawings

Figure 1 is a circuit diagram of an active clamp high-gain interleaved parallel boost converter.

Detailed ways

Referring to Fig. 1, the active clamp high-gain interleaved parallel boost converter of the present invention includes two power switch tubes S1, S2, two clamp diodes Dc1, Dc2, two output diodes Do1, Do2, two Auxiliary power switching tubes Sc1, Sc2, two clamping capacitors Cc1, Cc2, two switching capacitors Cf1, Cf2, an output capacitor Co and two coupling inductors, the first coupling inductor has two windings L1a, L1b, the second coupling The inductance has two windings L2a, L2b, one end of the first winding L1a of the first coupling inductance and one end of the first winding L2a of the second coupling inductance are connected to the positive end of the input power supply V _in together, the first of the first coupling inductance The other end of the winding L1a is connected to one end of the second winding L1b of the first coupled inductor, the drain of the first power switch S1 and the source of the first auxiliary power switch Sc1, and the drain of the first auxiliary power switch Sc1 Connected to one end of the first clamping capacitor Cc1, the other end of the first clamping capacitor Cc1 and the source of the first power switch tube S1 are connected to the ground, similarly, the other end of the first winding L2a of the second coupling inductor is connected to the first One end of the second winding L2b of the two coupled inductors, the drain of the second power switch S2 and the source of the second auxiliary power switch Sc2 are connected, and the drain of the second auxiliary power switch Sc2 is connected to the second clamping capacitor Cc2 One end of the second clamping capacitor Cc2 and the source of the second power switch S2 are connected to the ground, and the other end of the second winding L1b of the first coupling inductor is connected to the anode of the first clamping diode Dc1 and the first One end of the two switching capacitors Cf2 is connected, the cathode of the first clamping diode Dc1 is connected to the anode of the first output diode Do1 and one end of the first switching capacitor Cf1, and the other end of the second winding L2b of the second coupling inductor is connected to the second clamp The anode of the bit diode Dc2 is connected to the other end of the first switching capacitor Cf1, the cathode of the second clamping diode Dc2 is connected to the anode of the second output diode Do2 and the other end of the second switching capacitor Cf2, and the cathode of the first output diode Do1 It is connected to the cathode of the second output diode Do2 and the positive terminal of the output capacitor Co, and the negative terminal of the output capacitor Co is connected to the ground.

There are four commutation situations in the active-clamp high-gain interleaved parallel boost converter, that is, the commutation between the first power switch S1 off and the first auxiliary switch Sc1 on; the first auxiliary switch Sc1 off The commutation between switching off and the opening of the first switching tube S1; the switching between the switching off of the second power switching tube S2 and the switching on of the first auxiliary switching tube Sc2; the switching off of the first auxiliary switching tube Sc2 and the switching on of the second power switching tube The commutation between S2 openings. Due to the symmetry of the circuit, only the commutation process of the first power switch tube S1 is taken as an example to analyze as follows:

The commutation process in which the first power switch S1 is turned off and the first auxiliary switch Sc1 is turned on:

Before commutation, the circuit is stable when the first power switch S1 and the second power switch S2 are turned on, and the first clamping diode Dc1, the first output diode Do1, the second clamping diode Dc2, and the second output diode Do2 are turned off. working status. When the first power switch tube S1 is turned off, due to the parallel capacitance of the first power switch tube S1 itself, the voltage of the first power switch tube S1 rises linearly from zero with a certain slope, that is, the first power switch tube S1 achieves zero voltage off. When the voltage of the first power switch tube S1 rises to a certain value, the body diode of the first auxiliary switch tube Sc1 is turned on, the voltage of the first auxiliary switch tube Sc1 is zero, and the leakage inductance energy of the first coupling inductor is transferred to the first clamp On the capacitor Cc1 , after the body diode of the first auxiliary switch Sc1 is turned on, a gate signal of the first auxiliary switch Sc1 is given, and the zero-voltage turn-on of the first auxiliary switch Sc1 is realized. During this process, the first clamping diode Dc1 and the second output diode Do2 are turned on, and the energy of the coupling inductor starts to transfer to the output end of the circuit. Afterwards, the circuit enters into a stable operation state in which the first power transistor S1 is turned off, the first auxiliary switch transistor Sc1 is turned on, and the first clamping diode Dc1 and the second output diode Do2 are turned on.

The commutation process in which the first auxiliary switch tube Sc1 is turned off and the first power switch tube S1 is turned on:

Before the first auxiliary switching tube Sc1 is turned off, the leakage inductance of the first coupling inductor resonates with the first clamping capacitor Cc1 , and the first clamping diode Dc1 and the second output diode Do2 are in a conducting and stable working state. When the first auxiliary switching tube Sc is turned off, due to the parallel capacitance of the first power switching tube S1 itself, the voltage of the first auxiliary switching tube Sc1 rises linearly from zero with a certain slope, that is, the first auxiliary switching tube Sc1 realizes zero-voltage shutdown. broken. The leakage inductance of the first coupling inductor resonates with the parallel capacitor on the first power switch tube S1, the energy of the parallel capacitor on the first power switch tube S1 is transferred to the leakage inductance of the first coupling inductor, and the voltage of the first power switch tube S1 changes from a certain value to Begin to decline with a certain slope. When the voltage of the first power switch tube S1 drops to zero, the body diode of the first power switch tube S1 is turned on. After the body diode of the first power switch tube S1 is turned on, the first power switch tube S1 is given The gate signal of S1 realizes the zero-voltage turn-on of the first power switch tube S1. The currents of the first clamping diode Dc1 and the second output diode Do2 decrease from a certain value with a certain slope. When the currents of the first clamping diode Dc1 and the second output diode Do2 drop to zero, the first clamping diodes Dc1, The second output diode Do2 is turned off. In this way, the reverse recovery currents of the first clamping diode Dc1 and the second output diode Do2 are zero, which greatly reduces the reverse recovery loss caused by the first clamping diode Dc1 and the second output diode Do2. Afterwards, the circuit enters into a stable operation state in which the first power switch tube S1 is turned on, and the first clamping diode Dc1 and the second output diode Do2 are turned off.

Claims (1)

1. active-clamp high-gain alternation and parallel connection boosting converter, it is characterized in that: comprise two power switch pipe (S1, S2), two clamp diode (Dc1, Dc2), two output diode (Do1, Do2), two auxiliary power switching tube (Sc1, Sc2), two clamping capacitance (Cc1, Cc2), two switching capacity (Cf1, Cf2), an output capacitance (Co) and two coupling inductances, first coupling inductance has two winding (L1a, L1b), second coupling inductance has two winding (L2a, L2b), one end of one end of first winding (L1a) of first coupling inductance and first winding (L2a) of second coupling inductance links to each other with the anode of input power supply jointly, one end of the other end of first winding (L1a) of first coupling inductance and second winding (L1b) of first coupling inductance, the source electrode of the drain electrode of first power switch pipe (S1) and the first auxiliary power switching tube (Sc1) links to each other, the drain electrode of the first auxiliary power switching tube (Sc1) links to each other with an end of first clamping capacitance (Cc1), the source electrode of the other end of first clamping capacitance (Cc1) and first power switch pipe (S1) links to each other with ground, one end of the other end of first winding (L2a) of second coupling inductance and second winding (L2b) of second coupling inductance, the source electrode of the drain electrode of second power switch pipe (S2) and the second auxiliary power switching tube (Sc2) links to each other, the drain electrode of the second auxiliary power switching tube (Sc2) links to each other with an end of second clamping capacitance (Cc2), the source electrode of the other end of second clamping capacitance (Cc2) and second power switch pipe (S2) links to each other with ground, the other end of second winding (L1b) of first coupling inductance links to each other with an end of the anode of first clamp diode (Dc1) and second switch electric capacity (Cf2), the negative electrode of first clamp diode (Dc1) links to each other with the anode of first output diode (Do1) and an end of first switching capacity (Cf1), the other end of second winding (L2b) of second coupling inductance links to each other with the other end of the anode of second clamp diode (Dc2) and first switching capacity (Cf1), the negative electrode of second clamp diode (Dc2) links to each other with the anode of second output diode (Do2) and the other end of second switch electric capacity (Cf2), the negative electrode of first output diode (Do1) links to each other with the negative electrode of second output diode (Do2) and the anode of output capacitance (Co), the negative terminal of output capacitance (Co) links to each other with ground, and the link of the drain electrode of the link of first winding (L1a) of above-mentioned first coupling inductance and first winding (L2a) of second coupling inductance and second winding (L1b) of first coupling inductance and first power switch pipe (S1) and the source electrode of the first auxiliary power switching tube (Sc1) is the end of the same name of first coupling inductance; The link of the drain electrode of the link of first winding (L2a) of second coupling inductance and first winding (L1a) of first coupling inductance and second winding (L2b) of second coupling inductance and second power switch pipe (S2) and the source electrode of the second auxiliary power switching tube (Sc2) is the end of the same name of second coupling inductance.

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