CN-224218288-U - DC-DC switching power supply control circuit based on phase-shifting full-bridge converter

CN224218288UCN 224218288 UCN224218288 UCN 224218288UCN-224218288-U

Abstract

The utility model relates to the technical field of control circuits, in particular to a DC-DC switching power supply control circuit based on a phase-shifting full-bridge converter, which comprises an inverter circuit, a resonant circuit, a rectifying circuit and a filter circuit which are electrically connected, wherein a transformer exciting inductance Lm is arranged on a transformer Tr in parallel, a transformer leakage inductance Lr and a blocking capacitor Cr are arranged on the transformer Tr in series, and a booster circuit is electrically connected between the transformer leakage inductance Lr and the blocking capacitor Cr and comprises a diode VD1 and a MOS tube T5. The inverter circuit, the resonant circuit, the rectifying circuit and the filter circuit are easy to realize high frequency, the main circuit is simple in structure, and the soft switch is realized by adding the resonant elements such as small inductance, capacitance and the like and introducing the resonant condition before and after the switching process, and the inverter circuit, the resonant circuit, the rectifying circuit and the filter circuit have the advantages of high output power, high efficiency, simplicity in control, electrical isolation and the like.

Inventors

ZANG QIZHUN
CAI WEIWEI
SUN HEYUAN
YANG JIAN

Assignees

诚联电源股份有限公司

Dates

Publication Date: 20260508
Application Date: 20250528

Claims (7)

1. The DC-DC switching power supply control circuit based on the phase-shifting full-bridge converter comprises an inverter circuit (1), a resonant circuit (2), a rectifying circuit (3) and a filter circuit (4) which are electrically connected, and is characterized in that the resonant circuit (2) is electrically connected with the rectifying circuit (3) through a transformer Tr, a transformer excitation inductance Lm is arranged on the transformer Tr in parallel, and a transformer leakage inductance Lr and a blocking capacitor Cr are arranged on the transformer Tr in series; The transformer leakage inductance Lr and the blocking capacitor Cr are electrically connected with a booster circuit (5), the booster circuit (5) comprises a diode VD1 and a MOS tube T5, the diode VD1 is electrically connected between the transformer leakage inductance Lr and the blocking capacitor Cr, and the MOS tube T5 is provided with a capacitor C2 and a resistor RL in parallel.
2. The DC-DC switching power supply control circuit based on the phase-shifting full-bridge converter of claim 1, wherein an inductor L is electrically connected between the diode VD1 and the blocking capacitor Cr, and the inductor L is electrically connected with the inverter circuit (1) through the blocking capacitor Cr.
3. The DC-DC switching power supply control circuit based on the phase-shifting full-bridge converter of claim 1, wherein the inverter circuit (1) comprises a main switching tube T1, a main switching tube T2, a main switching tube T3 and a main switching tube T4, the main switching tube T1 and the main switching tube T2 are electrically connected with the blocking capacitor Cr, and the main switching tube T3 and the main switching tube T4 are electrically connected with the transformer excitation inductance Lm.
4. The DC-DC switching power supply control circuit based on the phase-shifting full-bridge converter of claim 3, wherein the main switching tube T1 and the main switching tube T2 are connected in series, and a capacitor C1 is arranged in parallel after the main switching tube T3 and the main switching tube T4 are connected in series.
5. The DC-DC switching power supply control circuit based on the phase-shift full-bridge converter according to claim 1, wherein the rectifying circuit (3) comprises a diode VD2 and a diode VD3, and the middle part of the transformer Tr is electrically connected with the filter circuit (4).
6. The DC-DC switching power supply control circuit based on the phase-shifting full-bridge converter of claim 1, wherein the filter circuit (4) comprises a triode VT1, a b pole pin of the triode VT1 is grounded through a capacitor C3, and a capacitor C4 and a resistor R2 are arranged on an e pole pin of the triode VT1 in parallel.
7. The DC-DC switching power supply control circuit based on the phase-shifting full-bridge inverter of claim 6, wherein a resistor R1 and a diode VD4 are serially arranged on a c-pole pin of the triode VT 1.

Description

DC-DC switching power supply control circuit based on phase-shifting full-bridge converter Technical Field The utility model relates to a switching power supply control circuit, in particular to a DC-DC switching power supply control circuit based on a phase-shifting full-bridge converter, and belongs to the technical field of control circuits. Background The DC-DC converter plays a vital role in electronic equipment, and can not only realize voltage conversion and stable output, but also regulate current, manage energy and monitor power distribution according to load requirements. With the continuous development of electronic technology, DC-DC converters will be widely used in more fields and play a greater role. The traditional full-bridge DC-DC converter generally adopts a metal oxide semiconductor field effect transistor and an insulated gate bipolar transistor as main switching devices, and an IGBT has the advantages of large current, high voltage resistance, high switching speed, low rated switching frequency and large single switching loss, so that larger filtering elements such as inductance, capacitance and the like are needed to influence the volume of the whole power supply, and the full-bridge DC-DC converter is not suitable for high-frequency application. Accordingly, there is a need for an improved DC-DC switching power supply control circuit based on a phase-shifted full-bridge converter to solve the above-mentioned problems. Disclosure of utility model The utility model aims to provide a DC-DC switching power supply control circuit based on a phase-shifting full-bridge converter, wherein the full-bridge DC-DC converter is a direct current conversion circuit suitable for a high-power switching power supply, an inverter circuit, a resonant circuit, a rectifying circuit and a filter circuit, the high-frequency is easy to realize, the main circuit is simple in structure, and resonance conditions are introduced before and after a switching process by adding resonance elements such as small inductance and capacitance so as to realize soft switching, and the advantages of high output power, high efficiency, simplicity in control, electric isolation and the like are benefited. In order to achieve the above purpose, the main technical scheme adopted by the utility model comprises the following steps: The DC-DC switching power supply control circuit based on the phase-shifting full-bridge converter comprises an inverter circuit, a resonant circuit, a rectifying circuit and a filter circuit which are electrically connected, wherein the resonant circuit is electrically connected with the rectifying circuit through a transformer Tr, a transformer excitation inductor Lm is arranged on the transformer Tr in parallel, and a transformer leakage inductance Lr and a blocking capacitor Cr are arranged on the transformer Tr in series; The transformer leakage inductance Lr and the blocking capacitor Cr are electrically connected with a boost circuit, the boost circuit comprises a diode VD1 and a MOS tube T5, the diode VD1 is electrically connected between the transformer leakage inductance Lr and the blocking capacitor Cr, and the MOS tube T5 is provided with a capacitor C2 and a resistor RL in parallel. Preferably, an inductance L is electrically connected between the diode VD1 and the dc blocking capacitor Cr, and the inductance L is electrically connected with the inverter circuit through the dc blocking capacitor Cr. Preferably, the inverter circuit includes a main switching tube T1, a main switching tube T2, a main switching tube T3, and a main switching tube T4, where the main switching tube T1 and the main switching tube T2 are electrically connected to the blocking capacitor Cr, and the main switching tube T3 and the main switching tube T4 are electrically connected to the transformer excitation inductor Lm. Preferably, the main switching tube T1 and the main switching tube T2 are connected in series, and the capacitor C1 is arranged in parallel after the main switching tube T3 and the main switching tube T4 are connected in series. Preferably, the rectifying circuit includes a diode VD2 and a diode VD3, and the middle portion of the transformer Tr is electrically connected to the filter circuit. Preferably, the filter circuit includes a triode VT1, a b pole pin of the triode VT1 is grounded through a capacitor C3, and a capacitor C4 and a resistor R2 are arranged on an e pole pin of the triode VT1 in parallel. Preferably, a resistor R1 and a diode VD4 are connected in series to the c-pole pin of the triode VT 1. The utility model has at least the following beneficial effects: The full-bridge DC-DC converter is a direct current conversion circuit, an inverter circuit, a resonant circuit, a rectifying circuit and a filter circuit which are suitable for a high-power switching power supply, is easy to realize high frequency, has a simple main circuit structure, introduces resonance conditions before and afte