Interleaved buck circuit and driving power supply

Abstract

The application relates to an interleaved BUCK circuit and a driving power supply, which comprises an interleaved BUCK control unit, a first BUCK power conversion unit, a second BUCK power conversion unit and a feedback unit; the feedback unit detects the voltage / current signal of the output end of the driving power supply and outputs a feedback signal; the interleaved BUCK control unit controls the off time of the first BUCK power conversion unit and the second BUCK power conversion unit according to the feedback signal, and controls the on time of the first BUCK power conversion unit and the second BUCK power conversion unit according to the zero-crossing signals of the first BUCK power conversion unit and the second BUCK power conversion unit; and the interleaved BUCK control unit also balances the power of the first BUCK power conversion unit and the second BUCK power conversion unit. The application can meet the demand of high power, has small volume, is convenient for heat dissipation, is low in cost, can realize power balance and guarantee the balance of the output.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, more particularly to an interleaved BUCK circuit and driving power supply. BACKGROUND

[0002] With the development of high-frequency switching power supply, it is more and more high-frequency, miniaturization, and higher power density, and people have higher requirements on efficiency, and demand is also increasing. Non-isolated line has the advantages of low cost and high efficiency compared with isolated line. Therefore, non-isolated BUCK line is applied more and more, and has the trend of more and more power.

[0003] At present, the wide application of BUCK line in LED driving power supply does not have big problem in small and medium power, but in large power such as hundreds of watts, even thousands of watts, the inductance volume in BUCK line will be very large, and the heat is not easy to handle, and the device selection is not easy to select, and the cost is significantly increased. In order to solve this problem, the existing scheme is to realize by using special chip, but using special chip will lead to cost increase, and the driving output power is small, which cannot meet the requirement of large power. Or, in other schemes, complementary BUCK control is adopted, however, the complementary BUCK control cannot solve the problem of power balance of two-way BUCK line, resulting in unbalanced output. SUMMARY

[0004] The technical problem to be solved by the present application is to provide an interleaved BUCK circuit and driving power supply in view of the defects of the prior art.

[0005] The technical scheme adopted by the present application to solve the technical problem is that an interleaved BUCK circuit is constructed, comprising: an interleaved BUCK control unit, a first BUCK power conversion unit, a second BUCK power conversion unit and a feedback unit;

[0006] The feedback unit is connected with the output end of the driving power supply, the interleaved BUCK control unit is connected with the feedback unit, and the first BUCK power conversion unit and the second BUCK power conversion unit are respectively connected with the interleaved BUCK control unit.

[0007] The feedback unit is configured to detect a voltage / current signal of an output terminal of the driving power supply and output a feedback signal; the interleaved BUCK control unit is configured to control off time of the first BUCK power conversion unit and the second BUCK power conversion unit according to the feedback signal, and control on time of the first BUCK power conversion unit and the second BUCK power conversion unit according to zero-crossing signals of the first BUCK power conversion unit and the second BUCK power conversion unit; and the interleaved BUCK control unit is further configured to balance power of the first BUCK power conversion unit and the second BUCK power conversion unit.

[0008] In the interleaved BUCK circuit, the detection unit is connected to the interleaved BUCK control unit.

[0009] The detection unit is configured to perform balancing detection and output a balancing detection signal to the interleaved BUCK control unit, so that the interleaved BUCK control unit balances and controls power of the first BUCK power conversion unit and the second BUCK power conversion unit according to the balancing detection signal.

[0010] In the interleaved BUCK circuit, the power supply unit is connected to the interleaved BUCK control unit and the feedback unit.

[0011] The power supply unit is configured to convert a received direct current voltage signal and output a first power supply signal and a second power supply signal to the interleaved BUCK control unit and the feedback unit, respectively.

[0012] In the interleaved BUCK circuit, the direct current input unit is connected to the power supply unit and the first BUCK power conversion unit, respectively.

[0013] The direct current input unit is configured to provide the direct current voltage signal to the power supply unit and the first BUCK power conversion unit.

[0014] In the interleaved BUCK circuit, the power supply unit comprises a power supply chip.

[0015] A first pin of the power supply chip is connected to the direct current input unit, a second pin of the power supply chip is connected to the interleaved BUCK control unit, a third pin of the power supply chip is connected to the feedback unit, a fourth pin of the power supply chip is connected to a floating ground, and a fifth pin, a sixth pin, a seventh pin and an eighth pin of the power supply chip are connected to a second power ground.

[0016] In the staggered BUCK circuit, the feedback unit comprises a sixth resistor, a feedback chip and an input part of a photoelectric coupler.

[0017] The sixth resistor is arranged on a negative output line of the driving power supply, a first pin of the feedback chip is connected with a negative output end on the negative output line of the driving power supply, a second pin of the feedback chip is connected with the power supply unit, a third pin of the feedback chip is connected with an input end of the input part of the photoelectric coupler, a fourth pin of the feedback chip and an output end of the input part of the photoelectric coupler are connected with a floating ground.

[0018] A fifth pin of the feedback chip is connected with a positive output end of the driving power supply, a sixth pin, a seventh pin and an eighth pin of the feedback chip are connected with the floating ground.

[0019] In the staggered BUCK circuit, the staggered BUCK control unit comprises a control chip and an output part of a photoelectric coupler.

[0020] A first pin of the control chip is connected with the first BUCK power conversion unit, a second pin of the control chip is connected with the second BUCK power conversion unit, a third pin of the control chip is connected with an input end of the output part of the photoelectric coupler, a fourth pin of the control chip and an output end of the output part of the photoelectric coupler are connected with a second power ground.

[0021] A first pin of the control chip is connected with the power supply unit, a sixth pin of the control chip is connected with the first BUCK power conversion unit, a seventh pin of the control chip is connected with the second BUCK power conversion unit, and an eighth pin of the control chip is connected with the detection unit.

[0022] In the staggered BUCK circuit, the first BUCK power conversion unit comprises a first switch tube, a first diode, a first inductor and a first capacitor.

[0023] A first end of the first switch tube is connected with the sixth pin of the control chip, a second end of the first switch tube is connected with the second power ground, and a third end of the first switch tube is connected with an anode of the first diode and a first end of the first inductor.

[0024] A cathode of the first diode receives the direct current voltage signal, a second end of the first inductor is connected with a second end of the first capacitor and a first end of the sixth resistor, a second end of the sixth resistor is connected with a negative output end on a negative output line of the driving power supply, and a first end of the first capacitor is connected with a positive output end of the driving power supply.

[0025] The third end of the first inductor is connected to the second power ground, and the second end of the first inductor is connected to the first pin of the control chip.

[0026] In the interleaved BUCK circuit, the second BUCK power conversion unit comprises a second switch tube, a second diode, a second inductor and a second capacitor.

[0027] The first end of the second switch tube is connected to the seventh pin of the control chip, the second end of the second switch tube is connected to the anode of the second diode and the first end of the second inductor, and the third end of the second switch tube is grounded.

[0028] The cathode of the second diode is connected to the second end of the second capacitor and receives the direct current voltage signal, the second end of the second capacitor is connected to the second end of the second inductor and connected to the floating ground, the third end of the second inductor is connected to the second power ground, and the fourth end of the second inductor is connected to the second pin of the control chip.

[0029] In the interleaved BUCK circuit, the first switch tube and the second switch tube are MOS tubes.

[0030] The first end of the first switch tube is the gate of the MOS tube, the second end of the first switch tube is the drain of the MOS tube, and the third end of the first switch tube is the source of the MOS tube.

[0031] The first end of the second switch tube is the gate of the MOS tube, the second end of the second switch tube is the drain of the MOS tube, and the third end of the second switch tube is the source of the MOS tube.

[0032] In the interleaved BUCK circuit, the detection unit comprises a fifth resistor.

[0033] The first end of the fifth resistor is connected to the second power ground, and the second end of the fifth resistor is connected to the eighth pin of the control chip and connected to the first power ground.

[0034] The application further provides a driving power supply comprising the interleaved BUCK circuit.

[0035] The interleaved BUCK circuit and driving power supply of the present invention have the following beneficial effects: It includes an interleaved BUCK control unit, a first BUCK power conversion unit, a second BUCK power conversion unit, and a feedback unit; the feedback unit detects the voltage / current signal at the output terminal of the driving power supply and outputs a feedback signal; the interleaved BUCK control unit controls the turn-off time of the first and second BUCK power conversion units according to the feedback signal, and controls the turn-on time of the first and second BUCK power conversion units according to the zero-crossing signals of the first and second BUCK power conversion units; the interleaved BUCK control unit also balances the power of the first and second BUCK power conversion units. The present invention can meet high power requirements, is small in size, facilitates heat dissipation, is low in cost, and can also achieve power balancing, ensuring output balance. Attached Figure Description

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0037] Figure 1 This is a schematic diagram of the structure of the interleaved BUCK circuit provided in an embodiment of the present invention;

[0038] Figure 2 This is a circuit diagram of the interleaved BUCK circuit provided in an embodiment of the present invention. Detailed Implementation

[0039] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0040] refer to Figure 1 This is a schematic diagram of an optional embodiment of the interleaved BUCK circuit provided by the present invention.

[0041] Specifically, such as Figure 1 As shown, the interleaved BUCK circuit includes: an interleaved BUCK control unit 20, a first BUCK power conversion unit 30, a second BUCK power conversion unit 40, and a feedback unit 50.

[0042] Feedback unit 50 is connected to the output terminal of the drive power supply, interleaved BUCK control unit 20 is connected to feedback unit 50, and first BUCK power conversion unit 30 and second BUCK power conversion unit 40 are respectively connected to interleaved BUCK control unit 20.

[0043] The feedback unit 50 is configured to detect a voltage / current signal of an output terminal of the driving power supply and output a feedback signal; the interleaved BUCK control unit 20 is configured to control off time of the first BUCK power conversion unit 30 and the second BUCK power conversion unit 40 according to the feedback signal, and control on time of the first BUCK power conversion unit 30 and the second BUCK power conversion unit 40 according to zero-crossing signals of the first BUCK power conversion unit 30 and the second BUCK power conversion unit 40; and the interleaved BUCK control unit 20 is further configured to balance power of the first BUCK power conversion unit 30 and the second BUCK power conversion unit 40.

[0044] Further, as shown in Figure 1 some embodiments, the interleaved BUCK circuit further comprises a detection unit 60 connected to the interleaved BUCK control unit 20.

[0045] The detection unit 60 is configured to perform balancing detection and output a balancing detection signal to the interleaved BUCK control unit 20, so that the interleaved BUCK control unit 20 balances power of the first BUCK power conversion unit 30 and the second BUCK power conversion unit 40 according to the balancing detection signal.

[0046] Further, as shown in Figure 1 some embodiments, the interleaved BUCK circuit further comprises a power supply unit 10 connected to the interleaved BUCK control unit 20 and the feedback unit 50.

[0047] The power supply unit 10 is configured to convert a received direct current voltage signal and output a first power supply signal and a second power supply signal to the interleaved BUCK control unit 20 and the feedback unit 50, respectively.

[0048] Further, as shown in Figure 1 some embodiments, the interleaved BUCK circuit further comprises a direct current input unit connected to the power supply unit 10 and the first BUCK power conversion unit 30, respectively.

[0049] The direct current input unit is configured to provide a direct current voltage signal to the power supply unit 10 and the first BUCK power conversion unit 30.

[0050] By adopting the interleaved BUCK topology structure of the interleaved BUCK circuit of the embodiment of the present application, two-way BUCK interleaved operation can be realized, which is safe and reliable, easy to realize, and the two-way BUCK can be realized by using small-size inductors, so that the volume of the driving power supply can be greatly reduced, and the problem of difficult heat dissipation is not caused, and the cost can be significantly reduced (if large-size inductors are used, heat dissipation is difficult to handle, and the corresponding switching tubes and other devices also need to be used at high prices, which further leads to a cost increase by several times). In addition, the present application can also realize power balance control based on the current conditions of the two-way BUCK, so as to achieve the effect of balancing the heat dissipation of the BUCK inductor, and also make the stress of the switching tube and the freewheeling tube balanced, so as to increase the output power, and meet the purpose of high-power output.

[0051] Specifically, referring to Figure 2 the circuit diagram of an optional embodiment of the interleaved BUCK circuit provided by the present application.

[0052] As Figure 2 shown, in this embodiment, the power supply unit 10 includes a power supply chip U3.

[0053] The first pin of the power supply chip U3 is connected to the direct current input unit, the second pin of the power supply chip U3 is connected to the interleaved BUCK control unit 20, the third pin of the power supply chip U3 is connected to the feedback unit 50, the fourth pin of the power supply chip U3 is connected to the floating ground, and the fifth pin, the sixth pin, the seventh pin and the eighth pin of the power supply chip U3 are connected to the second power supply ground. Among them, Figure 2 VIN is the direct current voltage signal output by the direct current input unit.

[0054] In this embodiment, the feedback unit 50 includes a sixth resistor R6, a feedback chip U1 and an input part OT1-A of an optoelectronic coupler.

[0055] The sixth resistor R6 is arranged on the negative output line of the driving power supply, the first pin of the feedback chip U1 is connected to the negative output end (LED-) on the negative output line of the driving power supply, the second pin of the feedback chip U1 is connected to the power supply unit 10, the third pin of the feedback chip U1 is connected to the input end of the input part OT1-A of the optoelectronic coupler, the fourth pin of the feedback chip U1 and the output end of the input part OT1-A of the optoelectronic coupler are connected to the floating ground; the fifth pin of the feedback chip U1 is connected to the positive output end (LED+) of the driving power supply, and the sixth pin, the seventh pin and the eighth pin of the feedback chip U1 are connected to the floating ground.

[0056] In this embodiment, the interleaved BUCK control unit 20 includes a control chip U2 and an output part OT1-B of an optoelectronic coupler.

[0057] The first pin of the control chip U2 is connected with the first BUCK power conversion unit 30, the second pin of the control chip U2 is connected with the second BUCK power conversion unit 40, the third pin of the control chip U2 is connected with the input end of the output part OT1-B of the photoelectric coupler, and the fourth pin of the control chip U2 is connected with the output end of the output part OT1-B of the photoelectric coupler and the second power supply ground.

[0058] The first pin of the control chip U2 is connected with the first BUCK power conversion unit 30, the second pin of the control chip U2 is connected with the second BUCK power conversion unit 40, the third pin of the control chip U2 is connected with the input end of the output part OT1-B of the photoelectric coupler, and the fourth pin of the control chip U2 is connected with the output end of the output part OT1-B of the photoelectric coupler and the second power supply ground.

[0059] In this embodiment, the first BUCK power conversion unit 30 comprises a first switch tube Q1, a first diode D1, a first inductor L1-A and a first capacitor CE1.

[0060] The first end of the first switch tube Q1 is connected with the sixth pin of the control chip U2, the second end of the first switch tube Q1 is connected with the second power supply ground, and the third end of the first switch tube Q1 is connected with the anode of the first diode D1 and the first end of the first inductor L1-A.

[0061] The cathode of the first diode D1 receives a direct current voltage signal, the second end of the first inductor L1-A is connected with the second end of the first capacitor CE1 and the first end of the sixth resistor R6, the second end of the sixth resistor R6 is connected with the negative output end on the negative output line of the driving power supply, and the first end of the first capacitor CE1 is connected with the positive output end of the driving power supply; the third end of the first inductor L1-A is connected with the second power supply ground, and the second end of the first inductor L1-A is connected with the first pin of the control chip U2.

[0062] In this embodiment, the second BUCK power conversion unit 40 comprises a second switch tube Q2, a second diode D2, a second inductor L1-B and a second capacitor CE2.

[0063] The first end of the second switch tube Q2 is connected with the seventh pin of the control chip U2, the second end of the second switch tube Q2 is connected with the anode of the second diode D2 and the first end of the second inductor L1-B, and the third end of the second switch tube Q2 is grounded.

[0064] The cathode of the second diode D2 is connected with the second end of the second capacitor CE2 and receives a direct current voltage signal, the second end of the second capacitor CE2 is connected with the second end of the second inductor L1-B and is connected to a floating ground, the third end of the second inductor L1-B is connected with the second power supply ground, and the fourth end of the second inductor L1-B is connected with the second pin of the control chip U2.

[0065] Optionally, in the embodiment of the present application, the first switch tube Q1 and the second switch tube Q2 are both MOS tubes.

[0066] The first terminal of the first switch Q1 is the gate of the MOSFET, the second terminal of the first switch Q1 is the drain of the MOSFET, and the third terminal of the first switch Q1 is the source of the MOSFET.

[0067] The first terminal of the second switch Q2 is the gate of the MOSFET, the second terminal of the second switch Q2 is the drain of the MOSFET, and the third terminal of the second switch Q2 is the source of the MOSFET.

[0068] like Figure 2 As shown, in this embodiment, the detection unit 60 includes a fifth resistor R5.

[0069] The first end of the fifth resistor R5 is connected to the second power supply ground, and the second end of the fifth resistor R5 is connected to the eighth pin of the control chip U2 and connected to the first power supply ground.

[0070] like Figure 2 As shown, VIN serves as a DC input, supplying power to the first BUCK power conversion unit 30 and the second BUCK power conversion unit 40. Simultaneously, the power supply unit 10 performs conversion to provide power signals to the interleaved BUCK control unit 20 and the feedback unit 50, respectively.

[0071] like Figure 2 As shown, when the first switch Q1 is turned on, the first inductor L1-A stores energy; when the first switch Q1 is turned off, the first inductor L1-A releases energy through the first diode D1, and the first capacitor CE1 is an energy storage filter capacitor.

[0072] Similarly, when the second switch Q2 is turned on, the second inductor L1-B stores energy; when the second switch Q2 is turned off, the second inductor L1-B releases energy through the second diode D2, and the second capacitor CE2 is an energy storage and filtering capacitor.

[0073] like Figure 2 As shown, the first BUCK power conversion unit 30 and the second BUCK power conversion unit 40 have two common connection points: one is connected to floating ground (BUCK_GND) through the sixth resistor R6, and the other is connected to the second power ground (GND2) through the third terminal of the first switch Q1 and the third terminal of the second switch Q2. Figure 2 GND1 is the first power ground, VCC1 is the first power supply signal, and VCC2 is the second power supply signal.

[0074] like Figure 2As shown, the sixth resistor R6 is a current sampling resistor for detecting the average current of the whole power loop, and the current signal converted into a voltage signal is sent to the feedback chip U1, and the voltage signal of the positive output end of the driving power is also sent to the feedback chip U1, and the feedback chip U1 transmits the signal to the interleaved BUCK control unit 20 through the input part OT1-A of the photoelectric coupler, thereby realizing the control of voltage and current.

[0075] Further, as shown, Figure 2 The fifth resistor R5 is an over-power protection resistor or a short-circuit protection resistor, and since the interleaved BUCK works, the embodiment of the application adopts average current control and negative voltage detection, and the voltage signal generated on the fifth resistor R5 is sent to the control chip U2, and then the control chip U2 realizes the balance control.

[0076] The control chip U2 controls the turn-on time of the first switch Q1 and the second switch Q2 by receiving the zero-crossing signal (ZCDA) generated by the first inductor L1-A and the zero-crossing signal (ZCDB) generated by the second inductor L1-B, and then sends the corresponding PWM drive signal to the first inductor L1-A and the second inductor L1-B, at the same time, receives the feedback signal of the feedback chip U1, and controls the turn-off time point of the first switch Q1 and the second switch Q2 according to the feedback signal of the feedback chip U1, thereby achieving the control of the whole power conversion.

[0077] The application also provides a driving power, which comprises the interleaved BUCK circuit disclosed in the embodiment of the application.

[0078] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the related parts can be referred to the method part.

[0079] The skilled person can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in the present text can be realized in electronic hardware, computer software or combination of the two, and in order to clearly show the interchangeability of hardware and software, the composition and steps of each example have been described in the above description. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0080] The steps of a method or algorithm described in connection with the embodiments disclosed herein can be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module can reside in random access memory (RAM), flash memory, read-only memory (ROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0081] The above embodiments are only to illustrate the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it accordingly, and cannot limit the protection scope of the present application. Any equivalent changes and modifications made within the scope of the claims of the present application shall belong to the scope of the claims of the present application.

Claims

1. An interleaved BUCK circuit, characterized in that, include: Interleaved BUCK control unit, first BUCK power conversion unit, second BUCK power conversion unit and feedback unit; The feedback unit is connected to the output terminal of the drive power supply, the interleaved BUCK control unit is connected to the feedback unit, and the first BUCK power conversion unit and the second BUCK power conversion unit are respectively connected to the interleaved BUCK control unit. The feedback unit is used to detect the voltage / current signal at the output terminal of the drive power supply and output a feedback signal; the interleaved BUCK control unit is used to control the turn-off time of the first BUCK power conversion unit and the second BUCK power conversion unit according to the feedback signal, and to control the turn-on time of the first BUCK power conversion unit and the second BUCK power conversion unit according to the zero-crossing signal of the first BUCK power conversion unit and the second BUCK power conversion unit; the interleaved BUCK control unit is also used to balance the power of the first BUCK power conversion unit and the second BUCK power conversion unit.

2. The interleaved BUCK circuit according to claim 1, characterized in that, Also includes: The detection unit connected to the interleaved BUCK control unit; The detection unit is used to perform equalization detection and outputs an equalization detection signal to the interleaved BUCK control unit, so that the interleaved BUCK control unit can perform equalization control on the power of the first BUCK power conversion unit and the second BUCK power conversion unit according to the equalization detection signal.

3. The interleaved BUCK circuit according to claim 2, characterized in that, Also includes: A power supply unit connected to the interleaved BUCK control unit and the feedback unit; The power supply unit is used to convert and process the received DC voltage signal, and then output a first power supply signal and a second power supply signal to the interleaved BUCK control unit and the feedback unit, respectively.

4. The interleaved BUCK circuit according to claim 3, characterized in that, Also includes: A DC input unit that is connected to the power supply unit and the first BUCK power conversion unit respectively; The DC input unit is used to provide the DC voltage signal to the power supply unit and the first BUCK power conversion unit.

5. The interleaved BUCK circuit according to claim 4, characterized in that, The power supply unit includes: a power supply chip; The first pin of the power supply chip is connected to the DC input unit, the second pin of the power supply chip is connected to the interleaved BUCK control unit, the third pin of the power supply chip is connected to the feedback unit, the fourth pin of the power supply chip is connected to floating ground, and the fifth, sixth, seventh and eighth pins of the power supply chip are connected to the second power ground.

6. The interleaved BUCK circuit according to claim 3, characterized in that, The feedback unit includes: a sixth resistor, a feedback chip, and the input section of an optocoupler; The sixth resistor is disposed on the negative output line of the driving power supply. The first pin of the feedback chip is connected to the negative output terminal on the negative output line of the driving power supply. The second pin of the feedback chip is connected to the power supply unit. The third pin of the feedback chip is connected to the input terminal of the input section of the optocoupler. The fourth pin of the feedback chip and the output terminal of the input section of the optocoupler are connected to floating ground. The fifth pin of the feedback chip is connected to the positive output terminal of the drive power supply, and the sixth, seventh and eighth pins of the feedback chip are connected to the floating ground.

7. The interleaved BUCK circuit according to claim 6, characterized in that, The interleaved BUCK control unit includes: a control chip and an output section of an optocoupler; The first pin of the control chip is connected to the first BUCK power conversion unit, the second pin of the control chip is connected to the second BUCK power conversion unit, the third pin of the control chip is connected to the input terminal of the output section of the optocoupler, and the fourth pin of the control chip and the output terminal of the output section of the optocoupler are connected to the second power ground. The first pin of the control chip is connected to the power supply unit, the sixth pin of the control chip is connected to the first BUCK power conversion unit, the seventh pin of the control chip is connected to the second BUCK power conversion unit, and the eighth pin of the control chip is connected to the detection unit.

8. The interleaved BUCK circuit according to claim 7, characterized in that, The first BUCK power conversion unit includes: a first switching transistor, a first diode, a first inductor, and a first capacitor; The first end of the first switching transistor is connected to the sixth pin of the control chip, the second end of the first switching transistor is connected to the second power ground, and the third end of the first switching transistor is connected to the anode of the first diode and the first end of the first inductor. The cathode of the first diode receives the DC voltage signal, the second end of the first inductor is connected to the second end of the first capacitor and the first end of the sixth resistor, the second end of the sixth resistor is connected to the negative output terminal on the negative output line of the driving power supply, and the first end of the first capacitor is connected to the positive output terminal of the driving power supply. The third end of the first inductor is connected to the second power ground, and the second end of the first inductor is connected to the first pin of the control chip.

9. The interleaved BUCK circuit according to claim 8, characterized in that, The second BUCK power conversion unit includes: a second switching transistor, a second diode, a second inductor, and a second capacitor; The first end of the second switching transistor is connected to the seventh pin of the control chip, the second end of the second switching transistor is connected to the anode of the second diode and the first end of the second inductor, and the third end of the second switching transistor is grounded. The cathode of the second diode is connected to the second terminal of the second capacitor and receives the DC voltage signal. The second terminal of the second capacitor is connected to the second terminal of the second inductor and connected to the floating ground. The third terminal of the second inductor is connected to the second power ground. The fourth terminal of the second inductor is connected to the second pin of the control chip.

10. The interleaved BUCK circuit according to claim 9, characterized in that, Both the first and second switching transistors are MOSFETs; The first terminal of the first switch is the gate of the MOS transistor, the second terminal of the first switch is the drain of the MOS transistor, and the third terminal of the first switch is the source of the MOS transistor. The first terminal of the second switch is the gate of the MOS transistor, the second terminal of the second switch is the drain of the MOS transistor, and the third terminal of the second switch is the source of the MOS transistor.

11. The interleaved BUCK circuit according to claim 7, characterized in that, The detection unit includes: a fifth resistor; The first end of the fifth resistor is connected to the second power ground, and the second end of the fifth resistor is connected to the eighth pin of the control chip and connected to the first power ground.

12. A driving power supply, characterized in that, include: The interleaved BUCK circuit according to any one of claims 1-11.

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