CN220874431U - Low-voltage AC/DC full-bridge synchronous rectification circuit - Google Patents
Low-voltage AC/DC full-bridge synchronous rectification circuit Download PDFInfo
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- CN220874431U CN220874431U CN202321732781.4U CN202321732781U CN220874431U CN 220874431 U CN220874431 U CN 220874431U CN 202321732781 U CN202321732781 U CN 202321732781U CN 220874431 U CN220874431 U CN 220874431U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model provides a low-voltage alternating current-direct current full bridge synchronous rectification circuit, including drive control circuit, power supply control circuit, alternating current-direct current switching circuit and external power supply circuit, drive control circuit includes first high limit drive control circuit, second high limit drive control circuit, first low limit drive control circuit and second low limit drive control circuit, power supply control circuit, external power supply circuit and alternating current-direct current switching circuit connect first high limit drive control circuit, second high limit drive control circuit respectively, first high limit drive control circuit and second low limit drive control circuit interconnect, second high limit drive control circuit and first low limit drive control circuit interconnect. Compared with the prior art, the low-voltage AC/DC full-bridge synchronous rectification circuit can improve the working efficiency of the rectification bridge part of the equipment with lower cost, can work in AC or DC input, reduces the heating value, improves the service life of the equipment, and can be used in a sealed environment.
Description
Technical Field
The present utility model relates to a rectifier circuit, and more particularly to a low-voltage ac/dc full-bridge synchronous rectifier circuit.
Background
At present, in some low-voltage high-power equipment applications, particularly high-power LED lamps, the rectifying part of the high-power LED lamps uses a traditional diode or a Schottky diode for rectification, and the traditional diode and the Schottky diode have the problems of higher on-voltage, higher lost power and low efficiency, so that huge heat is generated, and the service life of the equipment is seriously influenced particularly in a sealed environment; bridge synchronous rectification chips are also used, which are high in efficiency and low in heat productivity, but are costly.
Therefore, further improvements are needed.
Disclosure of utility model
The utility model aims to provide a low-voltage alternating current-direct current full-bridge synchronous rectification circuit which is simple in structure, high in working efficiency, low in cost, small in heating value, long in service life and strong in practicability, so that the defects in the prior art are overcome.
The low-voltage AC/DC full-bridge synchronous rectification circuit designed according to the purpose is characterized in that: the power supply control circuit, the external power supply circuit and the alternating current/direct current switching circuit are respectively connected with the first high-side drive control circuit and the second high-side drive control circuit, and the second high-side drive control circuit is connected with the first low-side drive control circuit;
The alternating current-direct current switching circuit is used for switching alternating current-direct current modes of the first high-side driving control circuit and the second high-side driving control circuit; when the first high-side drive control circuit and the second high-side drive control circuit are alternately changed, the drive control circuit respectively supplies power to the first high-side drive control circuit and the second high-side drive control circuit, and when the first high-side drive control circuit and the second high-side drive control circuit are not alternately changed, the external power supply circuit respectively supplies power to the first high-side drive control circuit and the second high-side drive control circuit.
The first high-side driving control circuit comprises a MOS tube Q1, a diode D3, a capacitor C3 and a rectifying chip U1, the second high-side driving control circuit comprises a MOS tube Q3, a diode D2, a diode D4, a capacitor C4 and a rectifying chip U2, the driving control circuit further comprises a capacitor C20 and a capacitor C21, the D end of the MOS tube Q1 and the D end of the MOS tube Q3 are respectively connected with the capacitor C20 and the capacitor C21, the capacitor C20 and the capacitor C21 are respectively connected with the power supply control circuit, the diode D1 and the diode D3 are mutually connected, the cathode of the diode D1 and one end of the capacitor C3 are respectively connected with the VCC end of the rectifying chip U1, the diode D2 and the diode D4 are mutually connected, and the cathode of the diode D2 and one end of the capacitor C4 are respectively connected with the VCC end of the rectifying chip U2.
The power supply control circuit comprises a power supply chip U3, a capacitor C9, a capacitor C10 and a capacitor C11, wherein the capacitor C10 is respectively connected with the VIN end of the power supply chip U3, the capacitor C20 and the capacitor C21, the capacitor C9 and the capacitor C11 are respectively connected with the VOUT end of the power supply chip U3, and the capacitor C9 is respectively connected with the anode of the diode D3 and the anode of the diode D4.
The external power supply circuit comprises a PMW signal end, a capacitor C6 and a capacitor C7, wherein the PMW signal end is respectively connected with one end of the capacitor C6 and one end of the capacitor C7, the other end of the capacitor C6 is connected with the anode of the diode D1, and the other end of the capacitor C7 is connected with the anode of the diode D2.
The AC/DC switching circuit comprises a resistor R18, an optocoupler IC3, an MCU and a comparator IC2A, wherein the AC1 end of the first high-side driving control circuit is connected with one end of the resistor R18, the other end of the R18 is connected with the 1 pin of the optocoupler IC3, the AC2 end of the second high-side driving control circuit is connected with the 2 pin of the optocoupler IC3, the 4 pin of the optocoupler IC3 and the in-phase end of the comparator IC2A are connected with the MCU, and the output end of the comparator IC2A is respectively connected with a capacitor C6 and a capacitor C7.
The first high-side drive control circuit further comprises a resistor R5, the AC1 end of the first high-side drive control circuit is connected with the S end of the MOS tube Q1, the D end of the MOS tube Q1 is connected with the VD end of the rectifying chip U1, the VS end of the rectifying chip U1 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with the S end of the MOS tube Q1, and the VGATE end of the rectifying chip U1 is connected with the G end of the MOS tube Q1.
The second high-side drive control circuit further comprises a resistor R6, the AC2 end of the second high-side drive control circuit is connected with the S end of the MOS tube Q3, the D end of the MOS tube Q3 is connected with the VD end of the rectifying chip U2, the VS end of the rectifying chip U2 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with the S end of the MOS tube Q3, and the VGATE end of the rectifying chip U2 is connected with the G end of the MOS tube Q3.
The first low-side driving control circuit comprises a comparator IC1A, a triode Q6, a MOS tube Q4, a resistor R16, a resistor R22, a diode D6, a resistor R12, a resistor R21, a resistor R8, a resistor R14 and a resistor R10, wherein the AC1 end of the first low-side driving control circuit is connected with one end of the resistor R16, the other end of the resistor R16, one end of the resistor R22 and the negative electrode of the diode D6 respectively connect with the inverting end of the comparator IC1A, one end of the resistor R12 and one end of the resistor R21 respectively connect with the same-phase end of the comparator IC1A, one end of the resistor R14 is connected with one end of the resistor R8, the other end of the resistor R14 is connected with the output end of the comparator IC1A, the base electrode of the triode Q6 is respectively connected with one end of the resistor R14 and one end of the resistor R8, the emitter of the triode Q6 is connected with the G end of the MOS tube Q4, one end of the resistor R10 is connected with the G end of the MOS tube Q4, the other end of the resistor R10 is grounded, and the D end of the MOS tube Q4 is connected with the AC2 end of the second high-side driving control circuit, and the MOS tube Q4 is grounded.
The second low-side driving control circuit comprises a comparator IC1B, a triode Q5, a MOS tube Q2, a resistor R15, a resistor R20, a diode D5, a resistor R11, a resistor R19, a resistor R7, a resistor R13 and a resistor R9, wherein the AC2 end of the second low-side driving control circuit is connected with one end of the resistor R15, the other end of the resistor R15, one end of the resistor R20 and the negative electrode of the diode D5 respectively connect with the inverting end of the comparator IC1B, one end of the resistor R11 and one end of the resistor R19 respectively connect with the same-phase end of the comparator IC1B, one end of the resistor R13 is connected with one end of the resistor R7, the other end of the resistor R13 is connected with the output end of the comparator IC1B, the base electrode of the triode Q5 is respectively connected with one end of the resistor R13 and one end of the resistor R7, the emitter of the triode Q5 is connected with the G end of the MOS tube Q2, one end of the resistor R9 is connected with the G end of the MOS tube Q2, the other end of the resistor R9 is grounded, and the D end of the MOS tube Q2 is connected with the AC1 end of the first high-side driving control circuit, and the MOS tube Q2 is grounded.
The power supply control circuit further comprises a capacitor C5, and the capacitor C5 is respectively connected with the VOUT end of the power supply chip U3, the other end of the resistor R8, the collector of the triode Q6, the other end of the resistor R7 and the collector of the triode Q5.
Compared with the prior art, the low-voltage AC/DC full-bridge synchronous rectification circuit can improve the working efficiency of the rectification bridge part of the equipment with lower cost, can work in AC or DC input, reduces the heating value, improves the service life of the equipment, and can be used in a sealed environment.
Drawings
Fig. 1 is a circuit diagram of a driving control circuit according to an embodiment of the utility model.
Fig. 2 is a circuit diagram of a power supply control circuit according to an embodiment of the utility model.
Fig. 3 is a circuit diagram of an ac/dc switching circuit according to an embodiment of the utility model.
Fig. 4 is a schematic diagram of a rectifying circuit according to an embodiment of the present utility model.
Detailed Description
The utility model is further described below with reference to the drawings and examples.
Referring to fig. 1-4, the low-voltage ac-dc full-bridge synchronous rectification circuit comprises a drive control circuit, a power supply control circuit 1, an ac-dc switching circuit 2 and an external power supply circuit 7, wherein the drive control circuit comprises a first high-side drive control circuit 3, a second high-side drive control circuit 4, a first low-side drive control circuit 5 and a second low-side drive control circuit 6, the power supply control circuit 1, the external power supply circuit 7 and the ac-dc switching circuit 2 are respectively connected with the first high-side drive control circuit 3 and the second high-side drive control circuit 4, the first high-side drive control circuit 3 and the second low-side drive control circuit 6 are mutually connected, and the second high-side drive control circuit 4 and the first low-side drive control circuit 5 are mutually connected;
The alternating current/direct current switching circuit 2 switches alternating current/direct current modes of the first high-side drive control circuit 3 and the second high-side drive control circuit 4; when the first high-side drive control circuit 3 and the second high-side drive control circuit 4 are alternately changed, the drive control circuit 3 supplies power to the first high-side drive control circuit 3 and the second high-side drive control circuit 4, respectively, and when the first high-side drive control circuit 3 and the second high-side drive control circuit 4 are not alternately changed, the external power supply circuit 7 supplies power to the first high-side drive control circuit 3 and the second high-side drive control circuit 4, respectively.
The first high-side driving control circuit 3 comprises a MOS tube Q1, a diode D3, a capacitor C3 and a rectifying chip U1, the second high-side driving control circuit 4 comprises a MOS tube Q3, a diode D2, a diode D4, a capacitor C4 and a rectifying chip U2, the driving control circuit further comprises a capacitor C20 and a capacitor C21, the D end of the MOS tube Q1 and the D end of the MOS tube Q3 are respectively connected with the capacitor C20 and the capacitor C21, the capacitor C20 and the capacitor C21 are respectively connected with the power supply control circuit 1, the diode D1 and the diode D3 are mutually connected, the cathode of the diode D1 and one end of the capacitor C3 are respectively connected with the VCC end (1 pin) of the rectifying chip U1, the other end of the capacitor C3 is connected with the AC1 end of the first high-side driving control circuit 3, the diode D2 and one end of the capacitor C4 are respectively connected with the VCC end (1 pin) of the rectifying chip U2, and the other end of the capacitor C4 is connected with the AC2 end of the second high-side driving control circuit 4, and the rectifying chip U2 and the rectifying chip 1167 is synchronous.
The power supply control circuit 1 comprises a power supply chip U3, a capacitor C9, a capacitor C10 and a capacitor C11, wherein the capacitor C10 is respectively connected with a VIN end (3 pin) of the power supply chip U3, the capacitor C20 and the capacitor C21, the capacitor C9 and the capacitor C11 are respectively connected with a VOUT end (1 pin) of the power supply chip U3, the capacitor C9 (12V) is respectively connected with an anode (12V) of a diode D3 and an anode (12V) of a diode D4, and the power supply chip U3 is a linear voltage stabilizing chip.
The external power supply circuit 7 comprises a PMW signal end, a capacitor C6 and a capacitor C7, wherein the PMW signal end is respectively connected with one end of the capacitor C6 and one end of the capacitor C7, the other end of the capacitor C6 is connected with the anode of the diode D1, and the other end of the capacitor C7 is connected with the anode of the diode D2.
The power supply of the high-low side chips is provided by a power supply chip U3:
AC1 and AC2 of the drive control circuit are subjected to bridge rectification through MOS transistors Q1, Q2, Q3 and Q4, then filtered by a capacitor C20, a capacitor C21 and a capacitor C10 and enter a power supply chip U3, the power supply chip U3 is stabilized to 12V output, filtered by a capacitor C11 and a capacitor C9, 12V is supplied to IC1 (a comparator IC1A and a comparator IC 1B) through a capacitor C5, and 12V is supplied to the rectification chip U1 through a diode D3 due to alternating change of AC1 and AC2, and 12V is supplied to the rectification chip U2 through a diode D4 and a diode D2, and the capacitor C4 is not alternately changed, so that the capacitor C3 and the capacitor C4 cannot be charged, an external PWM signal can alternately charge the capacitor C6 and the capacitor C7, and the capacitor C4 to provide twice the voltage to the ground through the diode D1 and the diode D2, and the capacitor C3 is supplied to the rectification chip U1, and the rectification chip can still obtain the rectification effect under the condition that the DC input of U1 and U2 is supplied.
The alternating current-direct current switching circuit 2 comprises a resistor R18, an optocoupler IC3, an MCU and a comparator IC2A, wherein the AC1 end of the first high-side driving control circuit 3 is connected with one end of the resistor R18, the other end of the R18 is connected with the 1 pin of the optocoupler IC3, the AC2 end of the second high-side driving control circuit 4 is connected with the 2 pin of the optocoupler IC3, the 4 pin of the optocoupler IC3 and the in-phase end of the comparator IC2A are connected with the MCU, the output end of the comparator IC2A is respectively connected with a capacitor C6 and a capacitor C7, and the comparator IC2A is an LM358 comparator.
Ac/dc mode switching:
The AC1 end and the AC2 end of the drive control circuit are connected into an optocoupler IC3 through a resistor R18, an alternating current-direct current power supply is converted into a signal, the signal is input into an MCU to be judged by a program, alternating signals are alternating current, otherwise the alternating signals are direct current, when the alternating current signals are judged, the pin of an MCU output control comparator IC2A is low level, when the alternating current signals are judged to be direct current, the pin of the MCU output control comparator IC2A is high-frequency square wave, and the comparator IC2A correspondingly drives and outputs the high-frequency square wave to a capacitor C6 and a capacitor C7, so that the mode switching effect is achieved.
The first high-side driving control circuit 3 further comprises a resistor R5, the AC1 end of the first high-side driving control circuit 3 is connected with the S end of the MOS tube Q1, the D end of the MOS tube Q1 is connected with the VD end (5 feet) of the rectifying chip U1, the VS end (6 feet) of the rectifying chip U1 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with the S end of the MOS tube Q1, and the VGATE end (8 feet) of the rectifying chip U1 is connected with the G end of the MOS tube Q1.
The second high-side drive control circuit 4 further comprises a resistor R6, the AC2 end of the second high-side drive control circuit 4 is connected with the S end of the MOS tube Q3, the D end of the MOS tube Q3 is connected with the VD end (5 feet) of the rectifying chip U2, the VS end (6 feet) of the rectifying chip U2 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with the S end of the MOS tube Q3, and the VGATE end (8 feet) of the rectifying chip U2 is connected with the G end of the MOS tube Q3.
The high side adopts an IR1167 synchronous rectification chip to be used as the driving control of the MOS transistor Q1 and the MOS transistor Q3:
When the voltage of the DS end of the MOS tube Q1 reaches-150 mV, the rectifying chip U1 acquires-150 mV through the connecting resistor R5 of the 5 pins and the 6 pins, the rectifying chip U1 drives the MOS tube Q1 through the 8 pins, the MOS tube Q1 is turned on, the AC1 flows to the VCC end of the drive control circuit, when the voltage of the DS end of the MOS tube Q1 is increased to-7 mV, the rectifying chip U1 acquires-7 mV through the connecting resistor R5 of the 5 pins and the 6 pins, the rectifying chip U1 turns off the MOS tube Q1 through the 8 pins, and the MOS tube Q1 is turned off.
When the AC2 of the drive control circuit is positive and the AC1 is negative, the AC2 passes through the MOS transistor Q3 body diode, when the DS terminal voltage of the MOS transistor Q3 reaches-150 mV, the rectifying chip U2 acquires-150 mV through the 5-pin and 6-pin connecting resistor R6, the rectifying chip U2 drives the MOS transistor Q3 through the 8-pin, the MOS transistor Q3 is opened, the AC2 flows to the VCC terminal of the drive control circuit, when the DS terminal voltage of the MOS transistor Q3 is increased to-7 mV, the rectifying chip U2 acquires-7 mV through the 5-pin and 6-pin connecting resistor R6, the rectifying chip U2 turns off the MOS transistor Q3 through the 8-pin, and the MOS transistor Q3 is cut off.
The first low-side driving control circuit 5 comprises a comparator IC1A, a triode Q6, a MOS tube Q4, a resistor R16, a resistor R22, a diode D6, a resistor R12, a resistor R21, a resistor R8, a resistor R14 and a resistor R10, wherein the AC1 end of the first low-side driving control circuit 5 is connected with one end of the resistor R16, the other end of the resistor R16, one end of the resistor R22 and the negative electrode of the diode D6 are respectively connected with the inverting end of the comparator IC1A, one end of the resistor R12 and one end of the resistor R21 are respectively connected with the same-phase end of the comparator IC1A, one end of the resistor R14 is connected with one end of the resistor R8, the other end of the resistor R14 is connected with the output end of the comparator IC1A, the base electrode of the triode Q6 is respectively connected with one end of the resistor R14 and one end of the resistor R8, the emitter of the triode Q6 is connected with the G end of the MOS tube Q4, one end of the resistor R10 is connected with the G end of the MOS tube Q4, the other end of the resistor R10 is grounded, and the D end of the MOS tube Q4 is connected with the S end of the second high-side driving circuit 4.
The second low-side driving control circuit 6 comprises a comparator IC1B, a triode Q5, a MOS tube Q2, a resistor R15, a resistor R20, a diode D5, a resistor R11, a resistor R19, a resistor R7, a resistor R13 and a resistor R9, wherein the AC2 end of the second low-side driving control circuit 6 is connected with one end of the resistor R15, the other end of the resistor R15, one end of the resistor R20 and the negative electrode of the diode D5 are respectively connected with the inverting end of the comparator IC1B, one end of the resistor R11 and one end of the resistor R19 are respectively connected with the same-phase end of the comparator IC1B, one end of the resistor R13 is connected with one end of the resistor R7, the other end of the resistor R13 is connected with the output end of the comparator IC1B, the base electrode of the triode Q5 is respectively connected with one end of the resistor R13, one end of the resistor R7, the emitter of the triode Q5 is connected with the G end of the MOS tube Q2, one end of the resistor R9 is connected with the G end of the MOS tube Q2, the other end of the resistor R9 is grounded, and the D end of the MOS tube Q2 is connected with the S end of the MOS tube Q2 of the first high-side driving control circuit 3.
The comparators IC1A and IC1B are LM2903 comparators.
The power supply control circuit 1 further comprises a capacitor C5, and the capacitor C5 (12V) is respectively connected with the VOUT end (1 pin) of the power supply chip U3, the other end (12V) of the resistor R8, the collector (12V) of the triode Q6, the other end (12V) of the resistor R7 and the collector (12V) of the triode Q5.
The low side adopts an LM2903 comparator to be used as the driving control of the MOS transistor Q2 and the MOS transistor Q4:
When the AC1 of the drive control circuit is positive and the AC2 is negative, the AC1 enters the inverting terminal of the comparator IC1A through the input protection of the resistor R16, the resistor R22 and the diode D6, and the reference voltage of the non-inverting terminal resistor R12 and the resistor R21 of the comparator IC1A is larger than that of the inverting terminal of the comparator IC1A, the output terminal of the comparator IC1A enters an open-drain state, 12V enters the output terminal of the comparator IC1A through the resistor R8 and the resistor R14, the triode Q6 reaches an opening condition, the MOS tube Q4 is driven by the 12V through the triode Q6, the MOS tube Q4 is opened, and GND flows back to the AC2 terminal of the second high-side drive control circuit 4; otherwise, the triode Q5 is cut off, and the resistor R9 pulls down to rapidly cut off the MOS transistor Q2.
When the AC2 of the drive control circuit is positive and the AC1 is negative, the AC2 is input and protected to enter the inverting terminal of the comparator IC1B through the resistor R15, the resistor R20 and the diode D5, and the reference voltage of the non-inverting terminal resistor R11 and the resistor R19 of the comparator IC1B is larger than that of the inverting terminal of the comparator IC1B, the output terminal of the comparator IC1B enters an open-drain state, 12V enters the output terminal of the comparator IC1B through the resistor R7 and the resistor R13, the triode Q5 reaches an opening condition, the MOS tube Q2 is driven by the 12V through the triode Q5, the MOS tube Q2 is opened, and GND flows back to the AC1 terminal of the first high-side drive control circuit 3; otherwise, the triode Q6 is cut off, and the resistor R10 pulls down the MOS tube Q4 which is cut off rapidly.
The foregoing is a preferred embodiment of the utility model showing and describing the general principles, features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the foregoing embodiments, which have been described in the foregoing description merely illustrates the principles of the utility model, and that various changes and modifications may be made therein without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (10)
1. A low-voltage AC/DC full-bridge synchronous rectification circuit is characterized in that: the power supply circuit comprises a drive control circuit, a power supply control circuit (1), an alternating current/direct current switching circuit (2) and an external power supply circuit (7), wherein the drive control circuit comprises a first high-side drive control circuit (3), a second high-side drive control circuit (4), a first low-side drive control circuit (5) and a second low-side drive control circuit (6), the power supply control circuit (1), the external power supply circuit (7) and the alternating current/direct current switching circuit (2) are respectively connected with the first high-side drive control circuit (3) and the second high-side drive control circuit (4), the first high-side drive control circuit (3) is connected with the second low-side drive control circuit (6), and the second high-side drive control circuit (4) is connected with the first low-side drive control circuit (5);
The alternating current/direct current switching circuit (2) switches alternating current/direct current modes of the first high-side driving control circuit (3) and the second high-side driving control circuit (4); when the first high-side drive control circuit (3) and the second high-side drive control circuit (4) are alternately changed, the drive control circuit (3) respectively supplies power to the first high-side drive control circuit (3) and the second high-side drive control circuit (4), and when the first high-side drive control circuit (3) and the second high-side drive control circuit (4) are not alternately changed, the external power supply circuit (7) respectively supplies power to the first high-side drive control circuit (3) and the second high-side drive control circuit (4).
2. The low voltage ac/dc full bridge synchronous rectification circuit of claim 1, wherein: the first high-side driving control circuit (3) comprises a MOS tube Q1, a diode D3, a capacitor C3 and a rectifying chip U1, the second high-side driving control circuit (4) comprises a MOS tube Q3, a diode D2, a diode D4, a capacitor C4 and a rectifying chip U2, the driving control circuit further comprises a capacitor C20 and a capacitor C21, the D end of the MOS tube Q1 and the D end of the MOS tube Q3 are respectively connected with the capacitor C20 and the capacitor C21, the capacitor C20 and the capacitor C21 are respectively connected with the power supply control circuit (1), the diode D1 and the diode D3 are mutually connected, the cathode of the diode D1 and one end of the capacitor C3 are respectively connected with the VCC end of the rectifying chip U1, the diode D2 and the diode D4 are mutually connected, and the cathode of the capacitor C4 and one end of the capacitor C4 are respectively connected with the VCC end of the rectifying chip U2.
3. The low-voltage ac/dc full-bridge synchronous rectification circuit of claim 2, wherein: the power supply control circuit (1) comprises a power supply chip U3, a capacitor C9, a capacitor C10 and a capacitor C11, wherein the capacitor C10 is respectively connected with the VIN end of the power supply chip U3, the capacitor C20 and the capacitor C21, the capacitor C9 and the capacitor C11 are respectively connected with the VOUT end of the power supply chip U3, and the capacitor C9 is respectively connected with the anode of the diode D3 and the anode of the diode D4.
4. The low-voltage ac/dc full-bridge synchronous rectification circuit of claim 2, wherein: the external power supply circuit (7) comprises a PMW signal end, a capacitor C6 and a capacitor C7, wherein the PMW signal end is respectively connected with one end of the capacitor C6 and one end of the capacitor C7, the other end of the capacitor C6 is connected with the anode of the diode D1, and the other end of the capacitor C7 is connected with the anode of the diode D2.
5. The low voltage ac/dc full bridge synchronous rectification circuit of claim 4, wherein: the alternating current-direct current switching circuit (2) comprises a resistor R18, an optocoupler IC3, an MCU and a comparator IC2A, wherein the AC1 end of the first high-side driving control circuit (3) is connected with one end of the resistor R18, the other end of the R18 is connected with the 1 pin of the optocoupler IC3, the AC2 end of the second high-side driving control circuit (4) is connected with the 2 pin of the optocoupler IC3, the 4 pin of the optocoupler IC3 and the in-phase end of the comparator IC2A are connected with the MCU, and the output end of the comparator IC2A is respectively connected with a capacitor C6 and a capacitor C7.
6. The low-voltage ac/dc full-bridge synchronous rectification circuit of claim 2, wherein: the first high-side drive control circuit (3) further comprises a resistor R5, the AC1 end of the first high-side drive control circuit (3) is connected with the S end of the MOS tube Q1, the D end of the MOS tube Q1 is connected with the VD end of the rectifying chip U1, the VS end of the rectifying chip U1 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with the S end of the MOS tube Q1, and the VGATE end of the rectifying chip U1 is connected with the G end of the MOS tube Q1.
7. The low-voltage ac/dc full-bridge synchronous rectification circuit of claim 2, wherein: the second high-side drive control circuit (4) further comprises a resistor R6, the AC2 end of the second high-side drive control circuit (4) is connected with the S end of the MOS tube Q3, the D end of the MOS tube Q3 is connected with the VD end of the rectifying chip U2, the VS end of the rectifying chip U2 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with the S end of the MOS tube Q3, and the VGATE end of the rectifying chip U2 is connected with the G end of the MOS tube Q3.
8. The low-voltage ac/dc full-bridge synchronous rectification circuit of claim 3, wherein: the first low-side driving control circuit (5) comprises a comparator IC1A, a triode Q6, a MOS tube Q4, a resistor R16, a resistor R22, a diode D6, a resistor R12, a resistor R21, a resistor R8, a resistor R14 and a resistor R10, wherein the AC1 end of the first low-side driving control circuit (5) is connected with one end of the resistor R16, the other end of the resistor R16, one end of the resistor R22 and the negative electrode of the diode D6 are respectively connected with the inverting end of the comparator IC1A, one end of the resistor R12 and one end of the resistor R21 are respectively connected with the same-phase end of the comparator IC1A, one end of the resistor R14 is connected with one end of the resistor R8, the other end of the resistor R14 is connected with the output end of the comparator IC1A, the base electrode of the triode Q6 is respectively connected with one end of the resistor R14, one end of the resistor R8, the emitter of the triode Q6 is connected with the G end of the MOS tube Q4, one end of the resistor R10 is grounded, the other end of the resistor R10 is connected with the inverting end of the MOS tube Q4, and the end of the MOS tube Q4 is connected with the ground end of the MOS tube Q4 is connected with the MOS tube Q4.
9. The low voltage ac/dc full bridge synchronous rectification circuit of claim 8, wherein: the second low-side driving control circuit (6) comprises a comparator IC1B, a triode Q5, a MOS tube Q2, a resistor R15, a resistor R20, a diode D5, a resistor R11, a resistor R19, a resistor R7, a resistor R13 and a resistor R9, wherein the AC2 end of the second low-side driving control circuit (6) is connected with one end of the resistor R15, the other end of the resistor R15, one end of the resistor R20 and the negative electrode of the diode D5 are respectively connected with the inverting end of the comparator IC1B, one end of the resistor R11 and one end of the resistor R19 are respectively connected with the same-phase end of the comparator IC1B, one end of the resistor R13 is connected with one end of the resistor R7, the other end of the resistor R13 is connected with the output end of the comparator IC1B, the base electrode of the triode Q5 is respectively connected with one end of the resistor R13, one end of the resistor R7 is connected with the G end of the MOS tube Q2, one end of the resistor R9 is connected with the G end of the MOS tube Q2, the other end of the resistor R9 is grounded, and the end of the MOS tube Q2 is connected with the ground end of the MOS tube Q2 is connected with the MOS tube Q2 of the first high-side driving circuit (3).
10. The low voltage ac/dc full bridge synchronous rectification circuit of claim 9, wherein: the power supply control circuit (1) further comprises a capacitor C5, wherein the capacitor C5 is respectively connected with the VOUT end of the power supply chip U3, the other end of the resistor R8, the collector of the triode Q6, the other end of the resistor R7 and the collector of the triode Q5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321732781.4U CN220874431U (en) | 2023-07-03 | 2023-07-03 | Low-voltage AC/DC full-bridge synchronous rectification circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321732781.4U CN220874431U (en) | 2023-07-03 | 2023-07-03 | Low-voltage AC/DC full-bridge synchronous rectification circuit |
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