CN217563527U

CN217563527U - PFC auxiliary power supply circuit and charging module

Info

Publication number: CN217563527U
Application number: CN202221514581.7U
Authority: CN
Inventors: 付财; 邓礼宽; 柏建国; 杨巍
Original assignee: Shenzhen Youyou Green Energy Co ltd
Current assignee: Shenzhen Youyou Green Energy Co ltd
Priority date: 2022-06-16
Filing date: 2022-06-16
Publication date: 2022-10-11
Anticipated expiration: 2032-06-16

Abstract

Disclosed are a PFC auxiliary power supply circuit and a charging module including the same. The PFC auxiliary power supply circuit comprises a power supply chip, an output unit connected to the output side of the power supply chip, a power supply unit connected to the power supply side of the power supply chip, and a switch unit for switching off the power supply chip in a standby state. Implement the utility model discloses a PFC auxiliary power supply circuit with the module of charging, when the module standby that charges, the switch element receives control signal and starts to close power chip, and then close whole PFC auxiliary power supply circuit, the loss of module of charging when the standby can effectual reduction.

Description

PFC auxiliary power supply circuit and charging module

Technical Field

The utility model relates to an auxiliary power supply field, more specifically say, relate to a PFC auxiliary power supply circuit and include PFC auxiliary power supply circuit's the module of charging.

Background

In order to shorten the charging time of the electric automobile, under the condition that a power battery allows, the voltage output by the charging pile needs to be increased to 1000V, the charging current needs to be increased to 350A, and the maximum power reaches 350KW. Therefore, the advantages of the high-voltage high-power charging pile are more remarkable. The charging module is a core component of the direct-current charging pile, and more charging modules must be used for developing a high-power charging pile. A direct current of 350KW fills electric pile, if adopt the 15KW module that charges, needs 24 modules that charge to connect in parallel. And 12 charging modules are also required to be connected in parallel by adopting a 30KW charging module. If each charging module is in a standby state, the auxiliary PFC source of each charging module is not turned off, higher standby loss is generated, and the loss of the whole charging pile is greatly increased when 12 or 24 charging modules are combined.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the present invention is to provide a PFC auxiliary power supply circuit that closes the PFC auxiliary source under the standby state and includes the PFC auxiliary power supply circuit and the module of charging to the above-mentioned defect to prior art.

The utility model provides a technical scheme that its technical problem adopted is: a PFC auxiliary power supply circuit is constructed including a power supply chip, an output unit connected to an output side of the power supply chip, a power supply unit connected to a power supply side of the power supply chip, and a switching unit that turns off the power supply chip in a standby state.

The PFC auxiliary power supply circuit in, the switch unit includes the switch tube, control signal, second end ground connection, third end connection are received to the first end of switch tube the control end of power chip is in order to close when the standby power chip.

In the PFC auxiliary power supply circuit of the present invention, the power chip is a UCC28C45 chip, the switch tube is a MOS tube, the gate of the MOS tube receives the control signal, the drain electrode is grounded, the source electrode is connected to the COMP pin of the UCC28C45 chip, the MOS tube is turned on when standby and will clamp the COMP pin of the UCC28C45 chip to zero to control the UCC28C45 chip stops working.

In the PFC auxiliary power circuit of the present invention, the switch unit further includes a first resistor, a second resistor, a third resistor and a fourth resistor, the gate of the MOS transistor is connected to the first end of the first resistor and the first end of the second resistor, the second end of the first resistor is connected to the control signal, the second end of the second resistor is connected to the drain of the MOS transistor and the ground, the first end of the third resistor and the first end of the fourth resistor are also connected to the drain of the MOS transistor and the ground, the second end of the third resistor is connected to the FB pin of the UCC28C45 chip, and the second end of the fourth resistor is connected to the COMP pin of the UCC28C45 chip.

In the PFC auxiliary power circuit of the present invention, the power supply unit includes a first capacitor, a second capacitor, a third capacitor, a fifth resistor, a sixth resistor, a seventh resistor, a first diode and a second diode, the first end of the first capacitor is grounded, the second end is connected to the VREF pin of the UCC28C45 chip, the first end of the fifth resistor and the first end of the seventh resistor, the second end of the fifth resistor is grounded, the CS pin of the UCC28C45 chip is grounded via the sixth resistor, the first end of the second capacitor is grounded, the second end is connected to the anode of the first diode, the cathode of the second diode and the second end of the seventh resistor, the cathode of the first diode is connected to the VREF pin of the UCC28C45 chip, and the anode of the second diode is connected to the COMP pin of the UCC28C45 chip.

The PFC auxiliary power supply circuit in, output unit includes first triode, second triode, eighth resistance, ninth resistance and fourth electric capacity, first triode with the base of second triode warp eighth resistance ground connection and warp ninth ohmic connection the OUT foot of UCC28C45 chip, the projecting pole of first triode is connected the collecting electrode of second triode, the collecting electrode ground connection of first triode, the projecting pole of second triode is connected the GND foot of UCC28C45 chip, fourth electric capacity is connected between the GND foot and the VDD foot of UCC28C45 chip, the VDD foot of UCC28C45 chip is connected power supply.

In the PFC auxiliary power supply circuit of the present invention, the output unit further includes a third diode and a fourth diode, the third diode and the fourth diode have an anode connected to the GND pin of the UCC28C45 chip and a cathode connected to the OUT pin of the UCC28C45 chip.

In the PFC auxiliary power supply circuit of the present invention, the output unit further includes a fifth capacitor, a sixth capacitor, a seventh capacitor, and an eighth capacitor, and the fifth capacitor, the sixth capacitor, the seventh capacitor, and the eighth capacitor are connected in parallel between the power supply and the ground.

The utility model provides a another technical scheme that its technical problem adopted is: a charging module is constructed and comprises the PFC auxiliary power supply circuit.

Implement the utility model discloses a PFC auxiliary power supply circuit and the module of charging, when the module standby that charges, the switch unit receives control signal and starts to close power chip, and then close whole PFC auxiliary power supply circuit, the loss of module of charging when the standby can effectual reduction. Furthermore, the MOS tube is matched with the UCC28C45 chip, so that the circuit is simple, the control is convenient and effective, and the loss is lower. By adopting a specific output unit design, the output waveform is more stable and effective.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic diagram of the PFC auxiliary power circuit of the present invention;

fig. 2 is a circuit diagram of a preferred embodiment of the PFC auxiliary power circuit of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Fig. 1 is a schematic diagram of the PFC auxiliary power circuit according to the present invention. As shown in fig. 1, the PFC auxiliary power circuit of the present invention includes a power chip 100, an output unit 200 connected to an output side of the power chip 100, a power supply unit 300 connected to a power side of the power chip 100, and a switch unit 400 for turning off the power chip 100 in a standby state.

In a preferred embodiment of the present invention, the Power chip 100 may be any suitable PFC (Power Factor Correction) Power chip including, but not limited to, the texas instruments UCx84x and UCCx8C4x series. In a preferred embodiment of the present invention, a UCC28C45 chip is preferred. In a preferred embodiment of the present invention, the switch unit 400 may include a switch tube, and the first end of the switch tube receives a control signal, the second end is grounded, and the third end is connected to the control end of the power chip 100 to turn off the power chip 100 in standby. In another preferred embodiment of the present invention, the switch unit 400 may further include other switch devices such as a relay. The power supply unit 300 may include any suitable peripheral circuit for supplying power to the power supply chip 100.

In the preferred embodiment, when the charging module is in standby, the switch unit 400 receives a control signal (for example, high level) to start, so as to turn off the power chip 100, and further turn off the entire PFC auxiliary power circuit, thereby effectively reducing the loss of the charging module in standby. When the charging module normally operates, the switching unit 400 does not receive the control signal or receives the low level signal, and the switching unit 400 is not activated, so that the power chip 100 normally operates.

Fig. 2 is a circuit diagram of a preferred embodiment of the PFC auxiliary power circuit of the present invention. As shown in fig. 2, the PFC auxiliary power circuit of the present invention includes a power chip 100, an output unit 200 connected to an output side of the power chip 100, a power supply unit 300 connected to a power side of the power chip 100, and a switch unit 400 for turning off the power chip 100 in a standby state. The power chip 100 is a UCC28C45 chip, and the switching unit 400 includes a MOS transistor Q4, a resistor R1, a resistor R2, a resistor R3, and a resistor R4. The power supply unit 300 includes a capacitor C1, a capacitor C2, a capacitor C8, a resistor R5, a resistor R6, a resistor R7, a diode D1, and a diode D2. The output unit 200 includes a transistor Q1, a transistor Q2, a resistor R8, a resistor R9, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a diode D3, and a diode D4.

The gate of the MOS transistor Q4 is connected to the first end of the resistor R1 and the first end of the resistor R2, the second end of the resistor R1 is connected to the control signal AUX _ CON, the second end of the resistor R2 is connected to the drain of the MOS transistor Q4 and the ground, the first end of the resistor R3 and the first end of the resistor R4 are also connected to the drain of the MOS transistor Q4 and the ground, the second end of the resistor R3 is connected to the FB pin of the UCC28C45 chip, and the second end of the resistor R4 is connected to the COMP pin of the UCC28C45 chip.

The first end of the capacitor C1 is grounded, the second end of the capacitor C1 is connected with the VREF pin of the UCC28C45 chip, the first end of the resistor R5 and the first end of the resistor R7, the second end of the resistor R5 is grounded through the capacitor C8, and the CS pin of the UCC28C45 chip is grounded through the resistor R6. And the RT/CT pin of the UCC28C45 chip is connected with the second end of the capacitor R5. The first end of the capacitor C2 is grounded, and the second end is connected to the anode of the diode D1, the cathode of the diode D2, and the second end of the resistor R7. The cathode of the diode D1 is connected with the VREF pin of the UCC28C45 chip, and the anode of the diode D2 is connected with the COMP pin of the UCC28C45 chip.

The base electrodes of the triode Q1 and the triode Q2 are grounded through the resistor R8 and connected with the OUT pin of the UCC28C45 chip through the resistor R9, and the emitting electrode of the triode Q1 is connected with the collecting electrode of the triode Q2. The collector of the triode Q1 is grounded, and the emitter of the triode Q2 is connected with the GND pin of the UCC28C45 chip. The capacitor C7 is connected between the GND pin and the VDD pin of the UCC28C45 chip. And the VDD pin of the UCC28C45 chip is connected with a power supply +14VP. The anodes of the diode D3 and the diode D4 are connected with the GND pin of the UCC28C45 chip, and the cathodes of the diodes are connected with the OUT pin of the UCC28C45 chip. The capacitor C3, the capacitor C4, the capacitor C5 and the capacitor C6 are connected in parallel between the power supply +14VP and the ground.

As shown in fig. 2, in the preferred embodiment, a MOS transistor is used in conjunction with the UCC28C45 chip, the gate of the MOS transistor Q4 is connected to the signal AUX _ CON, the drain is connected to ground, and the source is connected to the COMP pin of the UCC28C45 chip. When the charging module works normally, AUX _ CON is in low level or no signal is sent, at the moment, the MOS tube Q4 is not conducted, and the MOS tube and the UCC28C45 chip are adopted to be matched with each other to normally output a waveform with a fixed duty ratio to drive a subsequent circuit. When the charging module is in a standby state, AUX _ CON is at a high level, so that the MOS tube Q4 is switched on, the COMP pin of the UCC28C45 chip is clamped to zero, the COMP pin of the UCC28C45 chip stops working, and the PFC auxiliary power supply circuit is switched off, thereby reducing the standby loss of the module. The conduction loss of the MOS tube is very small. Therefore, in the embodiment, the MOS tube is matched with the UCC28C45 chip, so that the circuit is simple, the control is convenient and effective, and the loss is lower.

Further, in the preferred embodiment, the triode Q1 and the triode Q2 are used to control the output of driving signals in a push-pull manner, two diodes are clamped between the OUT pin and the GND pin of the UCC28C45 chip, and a plurality of capacitors are connected in parallel between the power supply +14VP and the ground to stabilize the voltage, so that the output driving waveform is more stable and effective.

Therefore, implement the utility model discloses a PFC auxiliary power supply circuit, when the module standby that charges, the switch element receives control signal and starts to close power chip, and then close whole PFC auxiliary power supply circuit, the loss of module when the standby can charge in effectual reduction. Furthermore, the MOS tube is matched with the UCC28C45 chip, so that the circuit is simple, the control is convenient and effective, and the loss is lower. By adopting the specific output unit design, the output waveform is more stable and effective.

The utility model discloses further relate to a module of charging, it includes aforementioned PFC auxiliary power circuit. The charging module can be constructed by one skilled in the art by using any known components in combination with the PFC auxiliary power circuit of the present invention, and will not be described in detail herein.

While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims

1. A PFC auxiliary power supply circuit is characterized by comprising a power supply chip, an output unit connected to the output side of the power supply chip, a power supply unit connected to the power supply side of the power supply chip, and a switch unit for turning off the power supply chip in a standby state.

2. The PFC auxiliary power circuit of claim 1, wherein the switching unit comprises a switching tube, a first end of the switching tube receives a control signal, a second end of the switching tube is grounded, and a third end of the switching tube is connected to a control end of the power chip to turn off the power chip during standby.

3. The PFC auxiliary power supply circuit of claim 2, wherein the power chip is a UCC28C45 chip, the switching transistor is an MOS transistor, a gate of the MOS transistor receives the control signal, a drain is grounded, and a source is connected to a COMP pin of the UCC28C45 chip, and the MOS transistor is turned on to clamp the COMP pin of the UCC28C45 chip to zero when in standby to control the UCC28C45 chip to stop working.

4. The PFC auxiliary power supply circuit of claim 3, wherein the switching unit further comprises a first resistor, a second resistor, a third resistor and a fourth resistor, the gate of the MOS transistor is connected to the first end of the first resistor and the first end of the second resistor, the second end of the first resistor is connected to the control signal, the second end of the second resistor is connected to the drain of the MOS transistor and ground, the first end of the third resistor and the first end of the fourth resistor are also connected to the drain of the MOS transistor and ground, the second end of the third resistor is connected to the FB pin of the UCC28C45 chip, and the second end of the fourth resistor is connected to the COMP pin of the UCC28C45 chip.

5. The PFC auxiliary power supply circuit according to claim 3, wherein the power supply unit comprises a first capacitor, a second capacitor, a third capacitor, a fifth resistor, a sixth resistor, a seventh resistor, a first diode and a second diode, a first end of the first capacitor is grounded, a second end of the first capacitor is connected with VREF pin of the UCC28C45 chip, a first end of the fifth resistor and a first end of the seventh resistor, a second end of the fifth resistor is grounded through the third capacitor, a CS pin of the UCC28C45 chip is grounded through the sixth resistor, a first end of the second capacitor is grounded, a second end of the second capacitor is connected with an anode of the first diode, a cathode of the second diode and a second end of the seventh resistor, a cathode of the first diode is connected with the VREF pin of the UCC28C45 chip, and an anode of the second diode is connected with the COMP pin of the UCC28C45 chip.

6. The PFC auxiliary power supply circuit according to claim 3, wherein the output unit comprises a first triode, a second triode, an eighth resistor, a ninth resistor and a fourth capacitor, bases of the first triode and the second triode are grounded through the eighth resistor and are connected with an OUT pin of the UCC28C45 chip through the ninth resistor, an emitter of the first triode is connected with a collector of the second triode, a collector of the first triode is grounded, an emitter of the second triode is connected with a GND pin of the UCC28C45 chip, the fourth capacitor is connected between the GND pin and a VDD pin of the UCC28C45 chip, and the VDD pin of the UCC28C45 chip is connected with a power supply.

7. The PFC auxiliary power supply circuit of claim 6, wherein the output unit further comprises a third diode and a fourth diode, wherein anodes of the third diode and the fourth diode are connected to the GND pin of the UCC28C45 chip, and cathodes of the third diode and the fourth diode are connected to the OUT pin of the UCC28C45 chip.

8. The PFC auxiliary power supply circuit of claim 6, wherein the output unit further comprises a fifth capacitor, a sixth capacitor, a seventh capacitor and an eighth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor and the eighth capacitor being connected in parallel between the power supply and ground.

9. A charging module comprising the PFC auxiliary power circuit of any one of claims 1 to 8.