Switching power supply

Abstract

Disclosed is a switching power supply, comprising a primary side control circuit and a secondary side control circuit, and further comprising a processor and a millimeter wave transmission circuit. The primary side control circuit, the secondary side control circuit, the processor and the millimeter wave transmission circuit are integrated on a same chip; the processor is connected to the primary side control circuit by means of the millimeter wave transmission circuit; and the processor is connected to the secondary side control circuit. The isolation by the millimeter wave transmission circuit ensures the safety distance requirement between the primary side control circuit 3 and the secondary side control circuit, thereby implementing a single-chip design in which the primary side control circuit and the secondary side control circuit are sealed together. The single-chip design not only ensures the simple design and small size of the switching power supply, but also reduces EMI interference. In addition, the control of the primary side control circuit is directly generated by the processor, and a control signal is transmitted by the processor via the millimeter wave transmission circuit, greatly improving the transmission speed of the control signal, achieving small delay and high efficiency.

Description

A switching power supply

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 14, 2023, with application number 202310869829.4 and application name “A Switching Power Supply”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the field of electric energy conversion, and in particular to a switching power supply. Background Art

[0003] A switching power supply is a high-frequency power conversion device that typically converts input AC power into a specific form of DC power to charge load devices. By controlling the on and off state of a switch, the operating power of the power transformer is controlled to meet the needs of different power circuits. Switching power supplies are widely used in automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communications equipment, and power equipment.

[0004] Existing switching power supplies mostly use discrete components for both the primary and secondary side controls. As shown in Figure 1, a switching power supply includes a primary-side switching power supply chip, a secondary-side synchronous rectifier chip, and a charging protocol chip. The discrete design of these chips is designed to meet safety distance requirements. Consequently, existing switching power supply designs are not only complex and bulky, but also lead to significant EMI interference.

[0005] Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a switching power supply that can realize a small-volume design of the switching power supply while reducing EMI interference.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A switching power supply comprising a primary-side control circuit and a secondary-side control circuit, further comprising a processor and a millimeter-wave transmission circuit;

[0009] The primary side control circuit, the secondary side control circuit, the processor and the millimeter wave transmission circuit are integrated on the same chip;

[0010] The processor is connected to the primary-side control circuit via the millimeter-wave transmission circuit;

[0011] The processor is connected to the secondary-side control circuit.

[0012] Furthermore, the millimeter wave transmission circuit includes a millimeter wave transmitting circuit and a millimeter wave receiving circuit;

[0013] One end of the millimeter wave transmitting circuit is connected to the processor, and the other end is wirelessly connected to one end of the millimeter wave receiving circuit;

[0014] The other end of the millimeter wave receiving circuit is connected to the primary side control circuit.

[0015] Furthermore, the millimeter wave transmission circuit is a millimeter wave transmission chip.

[0016] Furthermore, the primary side control circuit is a switching power supply chip.

[0017] Furthermore, the primary side control circuit includes a driver and a power switch tube;

[0018] The processor is connected to the input end of the driver through the millimeter wave transmission circuit;

[0019] The output end of the driver is connected to the power switch tube.

[0020] Furthermore, the primary side control circuit includes a logic control and fault protection circuit, an overvoltage protection circuit and a voltage stabilization circuit;

[0021] The overvoltage protection circuit and the voltage stabilizing circuit are connected to the logic control and fault protection circuit respectively;

[0022] The logic control and fault protection circuit is connected to the millimeter wave transmission circuit through the voltage stabilization circuit.

[0023] Furthermore, the millimeter wave transmission circuit includes a millimeter wave transmitting end, a millimeter wave receiving end, a transmitting antenna and a receiving antenna;

[0024] The logic control and fault protection circuit is connected to one end of the millimeter wave receiving end through the voltage stabilizing circuit, and the other end of the millimeter wave receiving end is connected to the receiving antenna;

[0025] One end of the millimeter wave transmitting end is connected to the processor, and the other end is connected to the transmitting antenna;

[0026] The transmitting antenna and the receiving antenna communicate with each other via millimeter waves.

[0027] Furthermore, the overvoltage protection circuit includes an AC overvoltage protection circuit, an undervoltage / overvoltage protection circuit and an X-capacitor discharge circuit;

[0028] The voltage stabilizing circuit includes a first low voltage difference linear voltage stabilizing circuit, a second low voltage difference linear voltage stabilizing circuit, a third low voltage difference linear voltage stabilizing circuit and a VCC overvoltage protection circuit;

[0029] The millimeter wave receiving end includes a signal output end, a receiving power supply end and a receiving enable end;

[0030] The output end of the AC overvoltage protection circuit, the output end of the undervoltage / overvoltage protection circuit, the output end of the X-capacitor discharge circuit, the output end of the first low voltage difference linear voltage regulator circuit, and the output end of the VCC overvoltage protection circuit are all connected to the input end of the logic control and fault protection circuit;

[0031] The output end of the second low voltage difference linear voltage regulator circuit is connected to the power input end of the power switch tube;

[0032] The first enable terminal of the logic control and fault protection circuit is connected to the first input terminal of the third low voltage difference linear voltage regulator circuit;

[0033] The output end of the third low voltage difference linear voltage regulator circuit is connected to the receiving power supply end of the millimeter wave receiving end;

[0034] The signal output end of the millimeter wave receiving end is connected to the logic control and fault protection circuit through a first buffer;

[0035] The second enable terminal of the logic control and fault protection circuit is connected to the receive enable terminal of the millimeter wave receiving end.

[0036] Furthermore, it also includes an input control circuit;

[0037] The input control circuit is respectively connected to the drain of the power switch tube, the input end of the AC overvoltage protection circuit, the input end of the undervoltage / overvoltage protection circuit, the input end of the X-capacitor discharge circuit, the input end of the first low-voltage difference linear voltage regulator circuit, the input end of the VCC overvoltage protection circuit, the input end of the second low-voltage difference linear voltage regulator circuit, the second input end of the third low-voltage difference linear voltage regulator circuit, and the input end of the logic control and fault protection circuit.

[0038] Furthermore, the primary side control circuit further includes an RS trigger;

[0039] The S and R terminals of the RS trigger are both connected to the logic control and fault protection circuit, the Q terminal is connected to the input terminal of the driver, and the output terminal of the driver is connected to the gate of the power switch tube.

[0040] Furthermore, the primary side control circuit further includes a negative voltage sampling circuit, a leading edge blanking circuit, a CS jitter correction circuit, a maximum frequency setting circuit and a first comparator;

[0041] The input control circuit is connected to the input end of the negative voltage sampling circuit;

[0042] The output end of the negative voltage sampling circuit 381 is connected to the input end of the leading edge blanking circuit 382;

[0043] The output end of the leading edge blanking circuit 382 is connected to the input end of the CS jitter correction circuit and the input end of the maximum frequency setting circuit respectively;

[0044] The output end of the CS jitter correction circuit is connected to the positive electrode of the first comparator;

[0045] The negative electrode of the first comparator is connected to a first reference voltage;

[0046] An output terminal of the first comparator and an output terminal of the maximum frequency setting circuit are connected to the logic control and fault protection circuit respectively.

[0047] Furthermore, a transformer is included;

[0048] The input control circuit includes a rectifier bridge, a first diode, a second diode, a first resistor, a first electrolytic capacitor, a second resistor, a first capacitor, a third diode, a fourth diode, a third resistor, a second capacitor and a fourth resistor;

[0049] One end of the AC input end of the rectifier bridge is connected to the anode of the first diode, and the other end is connected to the anode of the second diode;

[0050] The cathode of the first diode and the cathode of the second diode are both connected to one end of the first resistor, and the other end of the first resistor is respectively connected to the input end of the AC overvoltage protection circuit, the input end of the undervoltage / overvoltage protection circuit, and the input end of the X-capacitor discharge circuit;

[0051] The primary side of the transformer includes a first winding and a second winding;

[0052] One end of the DC end of the rectifier bridge is grounded, and the other end is respectively connected to the opposite-name end of the first winding, one end of the second resistor, one end of the first capacitor, and one end of the first electrolytic capacitor;

[0053] The other end of the first electrolytic capacitor is connected to one end of the third resistor;

[0054] The other end of the third resistor is connected to the input end of the negative voltage sampling circuit;

[0055] The other end of the second resistor and the other end of the first capacitor are respectively connected to the cathode of the third diode;

[0056] The anode of the third diode is connected to the drain of the power switch tube and the same-name end of the first winding respectively;

[0057] The same-name end of the second winding is connected to the anode of the fourth diode;

[0058] The cathode of the fourth diode is connected to one end of the fourth resistor;

[0059] The other end of the fourth resistor is respectively connected to the input end of the first low voltage difference linear voltage regulator circuit, the input end of the VCC overvoltage protection circuit, the input end of the second low voltage difference linear voltage regulator circuit, the second input end of the third low voltage difference linear voltage regulator circuit and one end of the second capacitor;

[0060] The other end of the second capacitor, the opposite-signal end of the second winding, and the source of the power switch are all grounded.

[0061] Furthermore, it also includes an output control circuit;

[0062] The output control circuit is connected to the secondary side of the transformer and the secondary side control circuit respectively.

[0063] Furthermore, the secondary side control circuit includes a synchronous rectification circuit;

[0064] The processor is connected to the synchronous rectification circuit.

[0065] Furthermore, the millimeter wave transmitting end includes a signal input end, a transmitting power supply end and a transmitting enable end;

[0066] The synchronous rectification circuit includes a detector, a voltage regulator, a fourth low-dropout linear voltage regulator circuit, an external over-temperature protection circuit, a Schmitt trigger, a latching shutdown / auto-restart circuit, a second comparator, a third comparator 418, a NOR operator, a first AND operator, a first OR operator, and a first oscillator;

[0067] The first input terminal and the second input terminal of the detector, the first input terminal and the output terminal of the voltage regulator, the input terminal and the output terminal of the fourth low-voltage difference linear voltage regulator circuit, the first output terminal of the external over-temperature protection circuit, the positive electrode of the Schmitt trigger, the input terminal of the latch shutdown / auto-restart circuit, the positive electrode of the second comparator, and the positive electrode of the third comparator are respectively connected to the output control circuit;

[0068] The first output terminal of the detector is connected to the second input terminal of the voltage regulator, and the second output terminal is connected to the processor;

[0069] The input end of the external over-temperature protection circuit is connected to the processor;

[0070] The output end of the Schmitt trigger and the output end of the latch shutdown / auto-restart are both connected to the processor;

[0071] The output terminal of the second comparator is connected to the first input terminal of the NOR operator;

[0072] The output terminal of the third comparator is connected to the second input terminal of the NOR operator;

[0073] The output terminal of the NOR operator is connected to the third input terminal of the first AND operator;

[0074] The first input terminal of the first AND operator is connected to the third output terminal of the detector;

[0075] The second input terminal of the first AND operator is connected to the processor;

[0076] The first output terminal and the second output terminal of the first oscillator are connected to the fourth input terminal and the fifth input terminal of the first AND operator;

[0077] The third output terminal of the first oscillator is connected to the processor;

[0078] The first input terminal of the first OR operator is connected to the processor;

[0079] The output terminal of the first AND operator is connected to the second input terminal of the first OR operator;

[0080] The output end of the first OR operator is connected to the signal input end of the millimeter wave transmitting end;

[0081] The enabling end of the processor is connected to the transmitting enabling end of the millimeter wave transmitting end;

[0082] The output end of the fourth low voltage difference linear voltage regulator circuit is connected to the transmitting power supply end of the millimeter wave transmitting end.

[0083] Furthermore, the output control circuit includes a first transistor, a second electrolytic capacitor, a fifth resistor, a third capacitor, a fourth capacitor, a sixth resistor, a seventh resistor and an eighth resistor;

[0084] The secondary side of the transformer includes a third winding;

[0085] The same-name ends of the third winding are respectively connected to one end of the second electrolytic capacitor, one end of the sixth resistor, the first input end of the detector, and the input end of the fourth low-voltage-difference linear voltage regulator circuit;

[0086] The other end of the second electrolytic capacitor is respectively connected to the source of the first transistor, one end of the third capacitor, one end of the fourth capacitor, and one end of the eighth resistor, and all are grounded;

[0087] The other end of the sixth resistor is connected to one end of the seventh resistor and the positive electrode of the second comparator respectively;

[0088] The other end of the seventh resistor is connected to the other end of the eighth resistor and the positive electrode of the second comparator respectively;

[0089] The other end of the third capacitor is connected to the output end of the voltage regulator and the positive electrode of the Schmitt trigger respectively;

[0090] The other end of the fourth capacitor is connected to the output end of the fourth low voltage difference linear voltage regulator circuit;

[0091] The opposite-name ends of the third winding are respectively connected to the drain of the first transistor and one end of the fifth resistor;

[0092] The source of the first transistor is connected to the processor via a second buffer;

[0093] The other end of the fifth resistor is connected to the second input end of the detector.

[0094] Furthermore, the secondary side control circuit further includes a charging protocol circuit;

[0095] The processor is connected to the charging protocol circuit.

[0096] Furthermore, the charging protocol circuit also includes a digital controller and a USB PD controller;

[0097] The sixth resistor and the seventh resistor in the output control circuit are replaced by a second transistor and a fifth capacitor;

[0098] The drain of the second transistor is respectively connected to the one end of the second electrolytic capacitor, the first input end of the voltage regulator, and the input end of the fourth low voltage difference linear voltage regulator circuit;

[0099] The source of the second transistor is connected to one end of the fifth capacitor and the USB PD controller respectively;

[0100] The gate of the second transistor is connected to the first output terminal of the digital controller;

[0101] The other end of the fifth capacitor is connected to the other end of the eighth resistor;

[0102] The input terminal of the digital controller is connected to the first input terminal of the detector;

[0103] The second output terminal of the digital controller is connected to the positive electrode of the second comparator;

[0104] The USB PD controller is connected to the first input terminal of the detector and the output terminal of the fourth low voltage difference linear voltage regulator circuit respectively;

[0105] The digital controller and the USB PD control line and control line are connected in sequence.

[0106] Furthermore, the logic control and fault protection circuit includes a fourth comparator, a first fault manager, a second AND operator, a second OR operator, a second oscillator, a first power manager, a fifth comparator, a sixth comparator 338 and a third transistor;

[0107] The output end of the AC overvoltage protection circuit is connected to the positive electrode of the fourth comparator;

[0108] The first output terminal of the first power manager is connected to the negative electrode of the fourth comparator;

[0109] An output terminal of the fourth comparator is connected to a first input terminal of the first fault manager;

[0110] The output terminal of the undervoltage / overvoltage protection circuit is connected to the second input terminal of the first fault manager;

[0111] The output terminal of the VCC overvoltage protection circuit is connected to the third input terminal of the first fault manager;

[0112] The fourth input terminal of the first fault manager is connected to the output terminal of the internal over-temperature protection circuit;

[0113] The output terminal of the first fault manager is inverted and connected to the first input terminal of the second AND operator;

[0114] The output terminal of the first low voltage difference linear voltage regulator circuit is connected to the first input terminal of the first power manager;

[0115] The second input terminal of the first power manager is connected to the output terminal of the soft start circuit;

[0116] The second output terminal of the first power manager is connected to the negative electrode of the fifth comparator;

[0117] The third output terminal of the first power manager is connected to the negative electrode of the sixth comparator;

[0118] The fourth output terminal of the first power manager is connected to the first input terminal of the third low voltage difference linear voltage regulator circuit;

[0119] The fifth output terminal of the first power manager is connected to the negative electrode of the first comparator;

[0120] The positive electrode of the fifth comparator is connected to the signal output terminal of the millimeter wave receiving end through the first buffer;

[0121] The output terminal of the fifth comparator is connected to the second input terminal of the second AND operator;

[0122] The positive input DC voltage of the sixth comparator;

[0123] The output end of the sixth comparator is connected to the receiving enable end of the millimeter wave receiving end;

[0124] The input terminal of the second oscillator is connected to the output terminal of the maximum frequency setting circuit;

[0125] The output terminal of the second oscillator is connected to the third input terminal of the AND operator;

[0126] The output end of the AND operator is connected to the S end of the RS trigger;

[0127] The first input terminal of the second OR operator is connected to the maximum on-time setting circuit;

[0128] The second input terminal of the second OR operator is connected to the output terminal of the first comparator;

[0129] The output terminal of the second OR operator is connected to the R terminal of the RS trigger;

[0130] The output end of the X capacitor discharge circuit is connected to the gate of the third transistor;

[0131] The drain of the third transistor is connected to the AC input;

[0132] The source of the third transistor is grounded.

[0133] Further, the processor includes a seventh comparator, a second power manager, an SR drive signal manager, a second fault manager, an SR enabling circuit, and a pulse frequency modulator;

[0134] An output terminal of the latch shutdown / auto-restart circuit is connected to an input terminal of the second power manager;

[0135] The second input terminal of the second power manager is connected to the negative electrode of the seventh comparator;

[0136] The other end of the sixth resistor is connected to the positive electrode of the seventh comparator;

[0137] The output end of the seventh comparator is connected to the transmit enable end of the millimeter wave transmitting end;

[0138] The second output terminal of the external over-temperature protection circuit, the output terminal of the Schmitt trigger, and the output terminal of the latch shutdown / auto-restart circuit are all connected to the input terminal of the second fault manager;

[0139] The output of the second fault manager, the output of the pulse frequency modulator, the second output of the detector, and the third output of the first oscillator are all connected to the input of the SR drive signal manager;

[0140] The first output terminal of the SR driving signal manager is connected to the input terminal of the second buffer;

[0141] The second output terminal of the SR driving signal manager is connected to the first input terminal of the first OR operator;

[0142] The third output terminal of the SR driving signal manager is connected to the input terminal of the SR enabling circuit;

[0143] The output terminal of the SR enabling circuit is connected to the second input terminal of the first AND operator.

[0144] Furthermore, the synchronous rectification circuit is a synchronous rectification chip, and the charging protocol circuit is a charging protocol chip.

[0145] Furthermore, the synchronous rectification circuit and the charging protocol circuit are respectively integrated into the processor.

[0146] Furthermore, a plurality of charging protocol circuits are integrated in the processor.

[0147] The beneficial effects of the present invention are: the primary side control circuit 3 and the secondary side control circuit of the switching power supply are integrated on the same chip, and a processor is set on the single chip, and the processor realizes the control of the primary side control circuit and the secondary side control circuit. At the same time, the processor and the primary side control circuit are arranged to communicate via a millimeter wave transmission circuit. The isolation of the millimeter wave transmission circuit ensures the safety distance requirement between the primary side control circuit and the secondary side control circuit, thereby realizing a single-chip design in which the primary side control circuit and the secondary side control circuit are sealed together. The single-chip design has a simple structure, which not only ensures the simplification and small size of the switching power supply design, but also can reduce EMI interference. In addition, since the control signals of the primary side control circuit and the secondary side control circuit are generated by the processor, the control of the primary side control circuit does not require feedback from the secondary side control circuit, but is directly generated by the processor. At the same time, the control signal is transmitted by the processor via the millimeter wave transmission circuit, thereby greatly improving the transmission speed of the control signal, with small delay and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0148] FIG1 is a schematic diagram of the circuit structure of a primary-secondary side control circuit of a switching power supply in the prior art;

[0149] FIG2 is a schematic diagram of a circuit structure of a switching power supply according to an embodiment of the present invention;

[0150] FIG3 is a schematic diagram of the internal structure of a processor of a switching power supply according to an embodiment of the present invention;

[0151] FIG4 is a circuit connection diagram of a processor of a switching power supply according to an embodiment of the present invention;

[0152] FIG5 is a schematic structural diagram of a switching power supply according to an embodiment of the present invention;

[0153] FIG6 is a schematic structural diagram of a primary side control circuit in a switching power supply according to an embodiment of the present invention;

[0154] FIG7 is a schematic structural diagram of a millimeter wave transmission circuit in a switching power supply according to an embodiment of the present invention;

[0155] FIG8 is a schematic structural diagram of a secondary side control circuit in a switching power supply according to an embodiment of the present invention;

[0156] FIG9 is a schematic structural diagram of an integrated design implemented in a switching power supply according to an embodiment of the present invention;

[0157] FIG10 is another structural diagram of a switching power supply including a charging protocol circuit according to an embodiment of the present invention;

[0158] FIG11 is a schematic structural diagram of a secondary-side control circuit including a charging protocol in a switching power supply according to an embodiment of the present invention;

[0159] FIG12 is a schematic diagram of another structure of a switching power supply including an integrated design of a charging protocol circuit according to an embodiment of the present invention;

[0160] 13 is a circuit structure diagram of a logic control and fault protection circuit in a switching power supply according to an embodiment of the present invention;

[0161] FIG14 is a circuit structure diagram of a processor in a switching power supply according to an embodiment of the present invention;

[0162] Explanation of the accompanying symbols: 1. millimeter wave transmission circuit; 11. millimeter wave transmitting circuit; 12. millimeter wave receiving circuit; 111. millimeter wave transmitting end; 121. millimeter wave receiving end; 112. transmitting antenna; 122. receiving antenna; 2. processor; 21. seventh comparator; 22. second power manager; 23. SR drive signal manager; 24. second fault manager; 25. SR enabling circuit; 26. pulse frequency modulator; 3. primary side control circuit; 31. driver; 32. power switch tube; 33. logic control and fault protection circuit; 331. fourth comparator; 332. first fault manager; 333. second AND operator; 334. second OR operator; 335. second oscillator; 336. first power manager; 337. fifth comparator; 338. sixth comparator; 339. third Transistor; 341, AC overvoltage protection circuit; 342, undervoltage / overvoltage protection circuit; 343, X-capacitor discharge circuit; 351, first low-voltage dropout linear voltage regulator circuit; 353, second low-voltage dropout linear voltage regulator circuit; 354, third low-voltage dropout linear voltage regulator circuit; 352, VCC overvoltage protection circuit; 36, first buffer; 37, RS trigger; 381, negative voltage sampling circuit; 382, ​​leading-edge blanking circuit; 383, CS jitter correction circuit; 384, maximum frequency setting circuit; 385, first comparator; 4, secondary side control circuit; 411, detector; 412, voltage regulator; 413, fourth low-voltage dropout linear voltage regulator circuit; 414, external overtemperature protection circuit; 415, Schmitt trigger; 416, latch shutdown / auto-restart; 417, second comparator; 418, Third comparator; 419, NOR operator; 420, first AND operator; 421, first OR operator; 422, first oscillator; 423, digital controller; 424, USB PD controller; 5, transformer; 61, rectifier bridge; 621, first diode; 622, second diode; 631, first resistor; 641, first electrolytic capacitor; 632, second resistor; 651, first capacitor; 623, third diode; 624, fourth diode; 633, third resistor; 652, second capacitor; 634, fourth resistor; 711, first transistor; 72, second electrolytic capacitor; 731, fifth resistor; 741, third capacitor; 742, fourth capacitor; 732, sixth resistor; 733, seventh resistor; 734, eighth resistor. DETAILED DESCRIPTION

[0163] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0164] The above-mentioned switching power supply of the present application can be applied to various fields that require charging, such as automation control, scientific research equipment, LED lighting, industrial control equipment, communication equipment, etc., which will be explained below through specific implementation methods.

[0165] In an optional embodiment, referring to FIG. 2 , a switching power supply includes a primary-side control circuit 3 and a secondary-side control circuit 4 , and further includes a processor 2 and a millimeter-wave transmission circuit 1 ;

[0166] The primary side control circuit 3, the secondary side control circuit 4, the processor 2 and the millimeter wave transmission circuit 1 are integrated on the same chip;

[0167] The processor 2 is connected to the primary side control circuit 3 through the millimeter wave transmission circuit 1;

[0168] The processor 2 is connected to the secondary-side control circuit 4 .

[0169] In order to achieve millimeter wave transmission, in an optional embodiment, the millimeter wave transmission circuit 1 includes a millimeter wave transmitting circuit 11 and a millimeter wave receiving circuit 12;

[0170] One end of the millimeter wave transmitting circuit 11 is connected to the processor 2, and the other end is wirelessly connected to one end of the millimeter wave receiving circuit 12;

[0171] The other end of the millimeter wave receiving circuit 12 is connected to the primary-side control circuit 3, wherein the processor 2 transmits a pulse width modulated PWM signal via the millimeter wave transmitting circuit 11 and the receiving circuit, and the PWM signal is directly output by the processor 2 to the primary-side control circuit 3 without the need for feedback from the secondary-side control circuit 4;

[0172] In this embodiment, the signal transmission between the processor 2 and the primary-side control circuit 3 is realized with the help of the millimeter wave transmission circuit 1. Since the millimeter wave transmission circuit 1 realizes signal transmission with the help of millimeter waves, it spatially isolates the primary-side control circuit 3 and the secondary-side control circuit 4. At the same time, the control signal of the primary-side control circuit 3 is directly sent by the processor 2 through the millimeter wave transmission circuit 1, which greatly improves the signal transmission speed.

[0173] In another optional embodiment, the millimeter wave transmission circuit 1 is a millimeter wave transmission chip, and the chip design can further reduce the size of the switching power supply, thereby achieving a lightweight design of the device.

[0174] In another optional embodiment, the primary-side control circuit 3 is a switching power supply chip. In this embodiment, the volume of the switching power supply is further reduced by designing the primary-side control circuit 3 as a chip.

[0175] As shown in FIG3 , in an optional embodiment, the primary side control circuit 3 includes a driver 31 Driver and a power switch tube 32 GaN;

[0176] The processor 2 is connected to the input end of the driver 31 through the millimeter wave transmission circuit 1;

[0177] The output end of the driver 31 is connected to the power switch tube 32;

[0178] In a specific implementation, the processor 2 transmits the PWM signal to the driver 31 Driver through the millimeter wave transmission circuit 1. The driver 31 Driver controls the operation of the power switch tube 32 GaN under the control of the PWM signal. The GaN output drives the transformer 5T. HV is the primary high-voltage power supply pin, D is the GaN drain pin, S is the GaN source pin, and S is connected to the primary ground.

[0179] In this embodiment, the processor 2 is a 110x series processor 2 .

[0180] In another optional embodiment, as shown in FIG5 and FIG6 , the primary side control circuit 3 includes a logic control and fault protection circuit 33Logic Control & Fault Protection, an overvoltage protection circuit and a voltage stabilization circuit;

[0181] The overvoltage protection circuit and the voltage stabilizing circuit are respectively connected to the logic control and fault protection circuit 33;

[0182] The logic control and fault protection circuit 33 is connected to the millimeter wave transmission circuit 1mmWTransceiver through the voltage stabilization circuit.

[0183] In Figure 6, Soft-Start indicates soft start; Ton_MAX indicates maximum on-time; and Internal OTP indicates internal over-temperature protection.

[0184] In another optional embodiment, as shown in FIG7 , the millimeter wave transmission circuit 1 includes a millimeter wave transmitting end 111 mmW Transmitter, a millimeter wave receiving end 121 mmW Receiver, a transmitting antenna 112 and a receiving antenna 122;

[0185] The logic control and fault protection circuit 33 is connected to one end of the millimeter wave receiving end 121 through the voltage stabilizing circuit, and the other end of the millimeter wave receiving end 121 is connected to the receiving antenna 122;

[0186] One end of the millimeter wave transmitting end 111 is connected to the processor 2 in the secondary side control circuit 4, and the other end is connected to the transmitting antenna 112;

[0187] The transmitting antenna 112 and the receiving antenna 122 communicate with each other via millimeter waves.

[0188] In another optional embodiment, as shown in FIG6 , the overvoltage protection circuit includes an AC overvoltage protection circuit 341 AC OVP, an undervoltage / overvoltage protection circuit 342 Brown In / Brown Out, and an X capacitor discharge circuit 343 X Cap Discharge;

[0189] The voltage stabilizing circuit includes a first low voltage difference linear voltage stabilizing circuit 351 LDO1, a second low voltage difference linear voltage stabilizing circuit 353 LDO2, a third low voltage difference linear voltage stabilizing circuit 354 LDO3 and a VCC overvoltage protection circuit 352 VCC OVP;

[0190] As shown in FIG7 , the millimeter wave receiving end 121 includes a signal output end RX, a receiving power supply end VRX and a receiving enable end EN_RX;

[0191] The output of the AC overvoltage protection circuit 341, the output of the undervoltage / overvoltage protection circuit 342, the output of the X-capacitor discharge circuit 343, the output of the first low-voltage difference linear voltage regulator circuit 351, and the output of the VCC overvoltage protection circuit 352 are all connected to the input of the logic control and fault protection circuit 33;

[0192] The output end of the second low voltage difference linear voltage regulator circuit 353 is connected to the power input end of the power switch tube 32;

[0193] The first enable terminal EN1 of the logic control and fault protection circuit 33 is connected to the first input terminal of the third low voltage difference linear voltage regulator circuit 354;

[0194] The output end of the third low voltage difference linear voltage regulator circuit 354 is connected to the receiving power supply end of the millimeter wave receiving end 121;

[0195] The signal output end of the millimeter wave receiving end 121 is connected to the logic control and fault protection circuit 33 through the first buffer 36;

[0196] The second enable terminal of the logic control and fault protection circuit 33 is connected to the receive enable terminal of the millimeter wave receiving end 121 .

[0197] In another optional embodiment, it further includes an input control circuit;

[0198] The input control circuit is respectively connected to the drain D of the power switch tube 32, the input end of the AC overvoltage protection circuit 341, the input end of the undervoltage / overvoltage protection circuit 342, the input end of the X-capacitor discharge circuit 343, the input end of the first low-voltage difference linear voltage regulator circuit 351, the input end of the VCC overvoltage protection circuit 352, the input end of the second low-voltage difference linear voltage regulator circuit 353, the second input end of the third low-voltage difference linear voltage regulator circuit 354, and the input end of the logic control and fault protection circuit 33.

[0199] In another optional embodiment, the primary side control circuit 3 further includes an RS trigger 37 and a driver 31Drive;

[0200] The S and R terminals of the RS trigger 37 are both connected to the logic control and fault protection circuit 33 , the Q terminal is connected to the input terminal of the driver 31 , and the output terminal of the driver 31 is connected to the gate of the power switch tube 32 .

[0201] In another optional embodiment, the present invention further includes a negative voltage sampling circuit 381 Negative voltage Sampling, a leading edge blanking circuit 382 LEB, a CS jitter correction circuit 383 CS jitter, a maximum frequency setting circuit 384 Maximum Frequency Setting, and a first comparator 385 Comp;

[0202] The input control circuit is connected to the input terminal of the negative voltage sampling circuit 381;

[0203] The output end of the negative voltage sampling circuit 381 is connected to the input end of the leading edge blanking circuit 382;

[0204] The output end of the leading edge blanking circuit 382 is connected to the input end of the CS jitter correction circuit 383 and the input end of the maximum frequency setting circuit 384 respectively;

[0205] The output terminal of the CS jitter correction circuit 383 is connected to the positive electrode of the first comparator 385;

[0206] The negative electrode of the first comparator 385 is connected to the first reference voltage;

[0207] The output end of the first comparator 385 and the output end of the maximum frequency setting circuit 384 are connected to the logic control and fault protection circuit 33 respectively.

[0208] In another optional embodiment, as shown in FIG5 , a transformer 5 is further included;

[0209] The input control circuit includes a rectifier bridge 61, a first diode 621, a second diode 622, a first resistor 631, a first electrolytic capacitor 641, a second resistor 632, a first capacitor 651, a third diode 623, a fourth diode 624, a third resistor 633, a second capacitor 652 and a fourth resistor 634;

[0210] One end of the AC input end of the rectifier bridge 61 is connected to the anode of the first diode 621, and the other end is connected to the anode of the second diode 622; optionally, the AC input end is connected to an EMI filter;

[0211] The cathode of the first diode 621 and the cathode of the second diode 622 are both connected to one end of the first resistor 631, and the other end of the first resistor 631 is respectively connected to the input end of the AC overvoltage protection circuit 341, the input end of the undervoltage / overvoltage protection circuit 342, the input end of the X-capacitor discharge circuit 343, the input end of the first low-voltage dropout linear voltage regulator circuit 351, the input end of the VCC overvoltage protection circuit 352, the input end of the second low-voltage dropout linear voltage regulator circuit 353, and the second input end of the third low-voltage dropout linear voltage regulator circuit 354;

[0212] The primary side of the transformer 5 includes a first winding and a second winding;

[0213] One end of the DC end of the rectifier bridge 61 is grounded, and the other end is respectively connected to the opposite-polarity end of the first winding, one end of the second resistor 632, one end of the first capacitor 651, and one end of the first electrolytic capacitor 641;

[0214] The other end of the first electrolytic capacitor 641 is connected to one end of the third resistor 633;

[0215] The other end of the third resistor 633 is connected to the input end of the negative voltage sampling circuit 381;

[0216] The other end of the second resistor 632 and the other end of the first capacitor 651 are respectively connected to the cathode of the third diode 623;

[0217] The anode of the third diode 623 is connected to the drain of the power switch tube 32 and the same-name end of the first winding respectively;

[0218] The same-name end of the second winding is connected to the anode of the fourth diode 624;

[0219] The cathode of the fourth diode 624 is connected to one end of the fourth resistor 634;

[0220] The other end of the fourth resistor 634 is respectively connected to the input end of the first low-voltage difference linear voltage regulator circuit 351, the input end of the VCC overvoltage protection circuit 352, the input end of the second low-voltage difference linear voltage regulator circuit 353, the second input end of the third low-voltage difference linear voltage regulator circuit 354, and one end of the second capacitor 652;

[0221] The other end of the second capacitor 652 , the opposite-polarity end of the second winding, and the source of the power switch 32 are all grounded.

[0222] In another optional embodiment, it further includes an output control circuit;

[0223] The output control circuit is connected to the secondary side of the transformer 5 and the secondary side control circuit 4 respectively.

[0224] In another optional embodiment, as shown in FIG7 , the millimeter wave transmitting end 111 includes a transmitting power supply end VTX, a signal input end TX, and a transmitting enable end EN_TX;

[0225] The secondary side control circuit 4 includes a synchronous rectification circuit, and the processor 2 is connected to the synchronous rectification circuit;

[0226] As shown in FIG8 , the synchronous rectification circuit includes a processor 2 Controller, a detector 411 Detector, a regulator 412 Regulator, a fourth low-dropout linear voltage regulator circuit 413 LDO, an external over-temperature protection circuit 414 EXOTP, a Schmitt trigger 415, a latch shutdown / auto-restart 416 LATCH / Auto Recovery, a second comparator 417, a third comparator 418, a NOR operator 419, a first AND operator 420, a first OR operator 421, and a first oscillator 422 Oscillator / Timer;

[0227] The first input terminal and the second input terminal of the detector 411, the first input terminal and the output terminal of the voltage regulator 412, the input terminal and the output terminal of the fourth low-voltage difference linear voltage regulator circuit 413, the output terminal of the external over-temperature protection circuit 414, the positive electrode of the Schmitt trigger 415, the input terminal of the latch shutdown / auto-restart 416, the positive electrode of the second comparator 417, and the positive electrode of the third comparator 418 are respectively connected to the output control circuit;

[0228] The first output terminal of the detector 411 is connected to the second input terminal of the voltage regulator 412, and the second output terminal is connected to the processor 2;

[0229] The input end of the external over-temperature protection circuit 414 is connected to the processor 2;

[0230] The output end of the Schmitt trigger 415 and the output end of the latch shutdown / auto-restart 416 are both connected to the processor 2;

[0231] The output terminal of the second comparator 417 is connected to the first input terminal of the NOR operator 419;

[0232] The output terminal of the third comparator 418 is connected to the second input terminal of the NOR operator 419;

[0233] The output terminal of the NOR operator 419 is connected to the third input terminal of the first AND operator 420;

[0234] The first input terminal of the first AND operator 420 is connected to the third output terminal of the detector 411;

[0235] The second input terminal of the first AND operator 420 is connected to the processor 2;

[0236] The first output terminal and the second output terminal of the first oscillator 422 are connected to the fourth input terminal and the fifth input terminal of the first AND operator 420;

[0237] The third output terminal of the first oscillator 422 is connected to the processor 2;

[0238] The first input terminal of the first OR operator 421 is connected to the processor 2;

[0239] The output terminal of the first AND operator 420 is connected to the second input terminal of the first OR operator 421;

[0240] The output end of the first OR operator 421 is connected to the signal input end of the millimeter wave transmitting end 111;

[0241] The enable terminal of the processor 2 is connected to the transmit enable terminal of the millimeter wave transmitting terminal 111;

[0242] The output end of the fourth low voltage difference linear voltage regulator circuit 413 is connected to the receiving end of the millimeter wave transmitting end 111;

[0243] The first output terminal TSmax of the first oscillator 422 represents the maximum switching period, the second output terminal tOFF_min represents the minimum off time, and the third output terminal tSECINH_max represents the secondary maximum INH time;

[0244] In Figure 4, Handshake / SET_Fault indicates the initial handshake / fault setting; INH indicates input high; VDD_UVTH indicates the VDD undervoltage threshold; VDD_UV indicates the undervoltage signal; Vis indicates the current source;

[0245] Specifically, as shown in FIG5 and FIG8, the output control circuit includes a first transistor 711 Q1, a second electrolytic capacitor 72, a fifth resistor 731, a third capacitor 741, a fourth capacitor 742, a sixth resistor 732, a seventh resistor 733 and an eighth resistor 734;

[0246] The secondary side of the transformer 5 includes a third winding;

[0247] The same-name ends of the third winding are respectively connected to one end of the second electrolytic capacitor 72, one end of the sixth resistor 732, the first input end of the detector 411, and the input end of the fourth low-voltage-difference linear voltage regulator circuit 413;

[0248] The other end of the second electrolytic capacitor 72 is respectively connected to the source of the first transistor 711, one end of the third capacitor 741, one end of the fourth capacitor 742, and one end of the eighth resistor 734, and all are grounded;

[0249] The other end of the sixth resistor 732 is connected to one end of the seventh resistor 733 and the positive electrode of the second comparator 417 respectively;

[0250] The other end of the seventh resistor 733 is connected to the other end of the eighth resistor 734 and the positive electrode of the second comparator 417 respectively;

[0251] The other end of the third capacitor 741 is connected to the output end of the voltage regulator 412 and the positive electrode of the Schmitt trigger 415 respectively;

[0252] The other end of the fourth capacitor 742 is connected to the output end of the fourth low voltage difference linear voltage regulator circuit 413;

[0253] The opposite-signal ends of the third winding are connected to the drain of the first transistor 711 and one end of the fifth resistor 731 respectively;

[0254] The source of the first transistor 711 is connected to the processor 2 via the second buffer 401;

[0255] The other end of the fifth resistor 731 is connected to the second input end of the detector 411 .

[0256] FIG9 is a schematic diagram showing the primary-side control circuit 3 , the secondary-side control circuit 4 and the millimeter-wave transmission circuit 1 integrated into the same chip. Fixed pins are provided to the outside, and connections only need to be made according to the corresponding pins.

[0257] In another optional embodiment, as shown in FIG10 and FIG11 , the secondary side control circuit 4 further includes a charging protocol circuit; the processor 2 is connected to the charging protocol circuit; that is, the secondary side control circuit 4 includes a synchronous rectification circuit and a charging protocol circuit;

[0258] The processor 2 is connected to the synchronous rectification circuit and the charging protocol circuit respectively;

[0259] In this embodiment, the processor 2 realizes unified control of the synchronous rectification and charging protocol circuit in the secondary side control circuit 4;

[0260] Specifically, the charging protocol circuit includes a digital controller 423 and a USB PD controller 424;

[0261] The sixth resistor 732 and the seventh resistor 733 in the output control circuit are replaced by a second transistor 712Q2 and a fifth capacitor 743;

[0262] The drain of the second transistor 712 is connected to the one end of the second electrolytic capacitor 72, the first input end of the voltage regulator 412, and the input end of the fourth low voltage difference linear voltage regulator circuit 413 respectively;

[0263] The source of the second transistor 712 is connected to one end of the fifth capacitor 743 and the USB PD controller 424 respectively;

[0264] The gate of the second transistor 712 is connected to the first output terminal of the digital controller 423;

[0265] The other end of the fifth capacitor 743 is connected to the other end of the eighth resistor 734;

[0266] The input terminal of the digital controller 423 is connected to the first input terminal of the detector 411;

[0267] The second output terminal of the digital controller 423 is connected to the positive electrode of the second comparator 417;

[0268] The USB PD controller 424 is connected to the first input terminal of the detector 411 and the output terminal of the fourth low voltage difference linear voltage regulator circuit 413 respectively;

[0269] The control lines of the digital controller 423 and the USB PD controller 424 are connected in sequence.

[0270] Figure 12 shows a schematic diagram of the primary-side control circuit 3, the secondary-side control circuit 4 including the charging protocol, and the millimeter-wave receiving and transmitting circuit integrated into the same chip. It provides fixed pins to the outside, and only needs to be connected according to the corresponding pins. Among them, DM / DP are USB Type-C / Type-A signal pins, and CC1 / CC2 pins are USB Type-C / Type-A detection pins. When used, they can be connected to the corresponding circuit of the switching power supply according to the corresponding pins as shown in Figure 10.

[0271] In another optional embodiment, as shown in FIG13 , the logic control and fault protection circuit 33 includes a fourth comparator 331 , a first fault manager 332 , a second AND operator 333 , a second OR operator 334 , a second oscillator 335 , a first power manager 336 , a fifth comparator 337 , a sixth comparator 338 , and a third transistor 339 ;

[0272] The output terminal of the AC overvoltage protection circuit 341 is connected to the positive electrode of the fourth comparator 331;

[0273] The first output terminal of the first power manager 336 is connected to the negative electrode of the fourth comparator 331;

[0274] The output terminal of the fourth comparator 331 is connected to the first input terminal of the first fault manager 332;

[0275] The output terminal of the undervoltage / overvoltage protection circuit 342 is connected to the second input terminal of the first fault manager 332;

[0276] The output terminal of the VCC overvoltage protection circuit 352 is connected to the third input terminal of the first fault manager 332;

[0277] The fourth input terminal of the first fault manager 332 is connected to the output terminal of the internal over-temperature protection circuit;

[0278] The output terminal of the first fault manager 332 is inverted and connected to the first input terminal of the second AND operator 333;

[0279] The output terminal of the first low voltage difference linear voltage regulator circuit 351 is connected to the first input terminal of the first power manager 336;

[0280] The second input terminal of the first power manager 336 is connected to the output terminal of the soft start circuit;

[0281] The second output terminal of the first power manager 336 is connected to the negative electrode of the fifth comparator 337;

[0282] The third output terminal of the first power manager 336 is connected to the negative electrode of the sixth comparator 338;

[0283] The fourth output terminal of the first power manager 336 is connected to the first input terminal of the third low voltage difference linear voltage regulator circuit 354;

[0284] The fifth output terminal of the first power manager 336 is connected to the negative electrode of the first comparator 385;

[0285] The positive electrode of the fifth comparator 337 is connected to the signal output terminal of the millimeter wave receiving end 121 via the first buffer 36;

[0286] The output terminal of the fifth comparator 337 is connected to the second input terminal of the second AND operator 333;

[0287] The positive input DC voltage VCC of the sixth comparator 338;

[0288] The output end of the sixth comparator 338 is connected to the receiving enable end of the millimeter wave receiving end 121;

[0289] The input terminal of the second oscillator 335 is connected to the output terminal of the maximum frequency setting circuit 384;

[0290] The output terminal of the second oscillator 335 is connected to the third input terminal of the AND operator;

[0291] The output end of the AND operator is connected to the S end of the RS trigger 37;

[0292] The first input terminal of the second OR operator 334 is connected to the maximum on-time setting circuit;

[0293] The second input terminal of the second OR operator 334 is connected to the output terminal of the first comparator 385;

[0294] The output terminal of the second OR operator 34 is connected to the R terminal of the RS flip-flop 37;

[0295] The output end of the X capacitor discharge circuit 343 is connected to the gate of the third transistor 339;

[0296] The drain of the third transistor 339 is connected to the AC input HV;

[0297] The source of the third transistor 339 is grounded.

[0298] In another optional embodiment, as shown in FIG14 , the processor 2 includes a seventh comparator 21 , a second power manager 22 , an SR drive signal manager 23 , a second fault manager 24 , an SR enabling circuit 25 , and a pulse frequency modulator 26 ;

[0299] The output terminal of the latch shutdown / auto-restart circuit 416 is connected to the input terminal of the second power manager 22;

[0300] The second input terminal of the second power manager 22 is connected to the negative electrode of the seventh comparator 21;

[0301] The other end of the sixth resistor 732 is connected to the positive electrode of the seventh comparator 21;

[0302] The output end of the seventh comparator 21 is connected to the transmission enable end of the millimeter wave transmitting end 111;

[0303] The second output terminal of the external over-temperature protection circuit 414, the output terminal of the Schmitt trigger 415, and the output terminal of the latch shutdown / auto-restart circuit 416 are all connected to the input terminal of the second fault manager 24;

[0304] The output of the second fault manager 24 , the output of the pulse frequency modulator 26 , the second output of the detector 411 , and the third output of the first oscillator 422 are all connected to the input of the SR drive signal manager 23 ;

[0305] The first output terminal of the SR driving signal manager 23 is connected to the input terminal of the second buffer 401;

[0306] The second output terminal of the SR driving signal manager 23 is connected to the first input terminal of the first OR operator 421;

[0307] The third output terminal of the SR driving signal manager 23 is connected to the input terminal of the SR enabling circuit 25;

[0308] The output terminal of the SR enabling circuit 25 is connected to the second input terminal of the first AND operator 420 .

[0309] In another optional embodiment, in order to further achieve a lightweight design, the synchronous rectification circuit is a synchronous rectification chip, and the charging protocol circuit is a charging protocol chip.

[0310] In another optional embodiment, the synchronous rectification circuit and the charging protocol circuit are respectively integrated into the processor 2, that is, the synchronous rectification circuit and the charging protocol circuit are embedded in the processor 2 to realize the synchronous rectification function and the charging function, thereby further reducing the size of the switching power supply through the integrated design;

[0311] In specific implementation, as shown in Figures 2 and 4, the 110x processor 2 provides a PWM OUTPUT pin, an SR pin, a GND pin, a VOUT pin, a DM pin, a DP pin, a CC1 pin, and a CC2 pin. After the 110x processor 2 is connected to the primary-side control circuit 3 including the driver 31 Driver and the power switch tube 32 GaN via the millimeter-wave transmission circuit 1, the entire single chip as a whole mainly provides an HV pin, a D pin, an S pin, an SR pin, a GND pin, a VOUT pin, a DM pin, a DP pin, a CC1 pin, and a CC2 pin. Among them, the HV pin is the primary-side high-voltage power supply pin, the D pin is the GaN drain pin, the S pin is the GaN source pin, the SR pin is the secondary-side synchronous rectification output, the DM / DP pins are USB Type-C signal pins, and the CC1 / CC2 pins are USB Type-C detection pins. In specific use, the corresponding pins can be connected to the corresponding circuit of the switching power supply as shown in Figure 1;

[0312] In another optional embodiment, as shown in Figure 3, the entire millimeter wave transmission control chip can adopt a PIP package structure. The millimeter wave transmission control chip includes a 110x series controller, a 2-way millimeter wave transmission isolator, a driver 31Driver, and a GaN high-power switch tube 32. The operation between each module in the millimeter wave transmission control single chip is uniformly controlled and processed by the 110x system controller; the 110x series controller includes PWM control, synchronous rectification control, and PD charging protocol. It can support more fast charging by adding relevant charging protocols according to different manufacturers, that is, multiple charging protocol circuits can be integrated in the 110x series controller, thereby improving the flexibility of charging of the switching power supply.

[0313] When the above-mentioned millimeter-wave transmission control chip is applied to an actual switching power supply, as shown in Figure 2, the switching power supply includes an input EMI filter circuit, a rectifier bridge 61 circuit, a coupling transformer 5T, a synchronous rectifier tube Q1, a millimeter-wave transmission control chip and an output USB Type-C interface; the millimeter-wave transmission control chip provides the pins required for each circuit signal in the switching power supply circuit. The millimeter-wave transmission control chip can be connected to the existing switching power supply circuit according to the existing connection relationship of each circuit signal.

[0314] In summary, the present invention provides a switching power supply that integrates the primary-side control circuit 3 and the secondary-side control circuit 4 of the switching power supply on the same chip, and provides a processor 2 on the single chip. The processor 2 controls the primary-side control circuit 3 and the secondary-side control circuit 4. At the same time, communication between the processor 2 and the primary-side control circuit 3 is provided via the millimeter-wave transmission circuit 1. The isolation of the millimeter-wave transmission circuit 1 ensures the safety distance requirement between the primary-side control circuit 3 and the secondary-side control circuit 4. This also realizes a single-chip design in which the primary-side control circuit 3 and the secondary-side control circuit 4 are sealed together, and the primary-side control circuit 3, the secondary-side control circuit 4, and the millimeter-wave transmission circuit 1 all realize a chip design. The single-chip design and chip design not only ensure the simplification and small size of the switching power supply design, but also reduce EMI interference. In addition, since the control signals of the primary-side control circuit 3 and the secondary-side control circuit 4 are both generated by the processor 2, the control of the primary-side control circuit 3 does not require feedback from the secondary-side control circuit 4, but is directly generated by the processor 2. At the same time, the control signal is transmitted by the processor 2 via the millimeter wave transmission circuit 1, which greatly improves the transmission speed of the control signal, with low delay and high efficiency. The minimalist peripheral devices further reduce the difficulty of design and debugging, reduce the board area, save costs, and achieve ultra-high overall power density. Compared with existing switching power supply solutions, the volume can be reduced by 30% to 40%.

[0315] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A switching power supply, comprising a primary control circuit (3) and a secondary control circuit (4), characterized in that: Also includes a processor (2) and a millimeter wave transmission circuit (1); The primary side control circuit (3), the secondary side control circuit (4), the processor (2) and the millimeter wave transmission circuit (1) are integrated on the same chip; The processor (2) is connected to the primary side control circuit (3) via the millimeter wave transmission circuit (1); The processor (2) is connected to the secondary side control circuit (4).

2. A switching power supply according to claim 1, characterized in that: The millimeter wave transmission circuit (1) comprises a millimeter wave transmitting circuit (11) and a millimeter wave receiving circuit (12); One end of the millimeter wave transmitting circuit (11) is connected to the processor (2), and the other end is wirelessly connected to one end of the millimeter wave receiving circuit (12); The other end of the millimeter wave receiving circuit (12) is connected to the primary side control circuit (3).

3. A switching power supply according to claim 1 or 2, characterized in that: The millimeter wave transmission circuit (1) is a millimeter wave transmission chip.

4. A switching power supply according to claim 1, characterized in that: The primary side control circuit (3) is a switching power supply chip.

5. A switching power supply according to claim 1 or 4, characterized in that: The primary side control circuit (3) comprises a driver (31) and a power switch tube (32); The processor (2) is connected to the input end of the driver (31) via the millimeter wave transmission circuit (1); The output end of the driver (31) is connected to the power switch tube (32).

6. A switching power supply according to claim 5, characterized in that: The primary control circuit (3) comprises a logic control and fault protection circuit (33), an overvoltage protection circuit and a voltage stabilization circuit; The overvoltage protection circuit and the voltage stabilization circuit are respectively connected to the logic control and fault protection circuit (33); The logic control and fault protection circuit (33) is connected to the millimeter wave transmission circuit (1) via the voltage stabilization circuit.

7. A switching power supply according to claim 6, characterized in that: The millimeter wave transmission circuit (1) comprises a millimeter wave transmitting end (111), a millimeter wave receiving end (121), a transmitting antenna (112) and a receiving antenna (122); The logic control and fault protection circuit (33) is connected to one end of the millimeter wave receiving end (121) through the voltage stabilizing circuit, and the other end of the millimeter wave receiving end (121) is connected to the receiving antenna (122); One end of the millimeter wave transmitting end (111) is connected to the processor (2), and the other end is connected to the transmitting antenna (112); The transmitting antenna (112) and the receiving antenna (122) communicate with each other via millimeter waves.

8. A switching power supply according to claim 7, characterized in that: The overvoltage protection circuit comprises an AC overvoltage protection circuit (341), an undervoltage / overvoltage protection circuit (342) and an X-capacitor discharge circuit (343); The voltage stabilizing circuit comprises a first low voltage difference linear voltage stabilizing circuit (351), a second low voltage difference linear voltage stabilizing circuit (353), a third low voltage difference linear voltage stabilizing circuit (354) and a VCC overvoltage protection circuit (352); The millimeter wave receiving end (121) comprises a signal output end, a receiving power supply end and a receiving enabling end; The output end of the AC overvoltage protection circuit (341), the output end of the undervoltage / overvoltage protection circuit (342), the output end of the X-capacitor discharge circuit (343), the output end of the first low voltage difference linear voltage regulator circuit (351), and the output end of the VCC overvoltage protection circuit (352) are all connected to the input end of the logic control and fault protection circuit (33); The output end of the second low voltage difference linear voltage stabilization circuit (353) is connected to the power input end of the power switch tube (32); The first enable terminal of the logic control and fault protection circuit (33) is connected to the first input terminal of the third low voltage difference linear voltage stabilization circuit (354); The output end of the third low voltage difference linear voltage stabilization circuit (354) is connected to the receiving power supply end of the millimeter wave receiving end (121); The signal output end of the millimeter wave receiving end (121) is connected to the logic control and fault protection circuit (33) through a first buffer (36); The second enable terminal of the logic control and fault protection circuit (33) is connected to the receive enable terminal of the millimeter wave receiving terminal (121).

9. A switching power supply according to claim 8, characterized in that: Also included is an input control circuit; The input control circuit is respectively connected to the drain of the power switch tube (32), the input end of the AC overvoltage protection circuit (341), the input end of the undervoltage / overvoltage protection circuit (342), the input end of the X-capacitor discharge circuit (343), the input end of the first low-voltage difference linear voltage regulator circuit (351), the input end of the VCC overvoltage protection circuit (352), the input end of the second low-voltage difference linear voltage regulator circuit (353), the second input end of the third low-voltage difference linear voltage regulator circuit (354), and the input end of the logic control and fault protection circuit (33).

10. A switching power supply according to claim 9, characterized in that: The primary side control circuit (3) further comprises an RS trigger (37); The S terminal and the R terminal of the RS trigger (37) are both connected to the logic control and fault protection circuit (33), the Q terminal is connected to the input terminal of the driver (31), and the output terminal of the driver (31) is connected to the gate of the power switch tube (32).

11. A switching power supply according to claim 9, wherein the primary side control circuit (3) further comprises a negative voltage sampling circuit (381), a leading edge blanking circuit (382), a CS jitter correction circuit (383), a maximum frequency setting circuit (384) and a first comparator (385); The input control circuit is connected to the input end of the negative voltage sampling circuit (381); The output end of the negative voltage sampling circuit (381) is connected to the input end of the leading edge blanking circuit (382); The output end of the leading edge blanking circuit (382) is respectively connected to the input end of the CS jitter correction circuit (383) and the input end of the maximum frequency setting circuit (384); The output end of the CS jitter correction circuit (383) is connected to the positive electrode of the first comparator (385); A negative electrode of the first comparator (385) is connected to a first reference voltage; The output end of the first comparator (385) and the output end of the maximum frequency setting circuit (384) are respectively connected to the logic control and fault protection circuit (33).

12. A switching power supply according to claim 11, characterized in that: Also includes a transformer (5); The input control circuit comprises a rectifier bridge (61), a first diode (621), a second diode (622), a first resistor (631), a first electrolytic capacitor (641), a second resistor (632), a first capacitor (651), A third diode (623), a fourth diode (624), a third resistor (633), a second capacitor (652) and a fourth resistor (634); One end of the AC input end of the rectifier bridge (61) is connected to the anode of the first diode (621), and the other end is connected to the anode of the second diode (622); The cathode of the first diode (621) and the cathode of the second diode (622) are both connected to one end of the first resistor (631), and the other end of the first resistor (631) is respectively connected to the input end of the AC overvoltage protection circuit (341), the input end of the undervoltage / overvoltage protection circuit (342), and the input end of the X-capacitor discharge circuit (343); The primary side of the transformer (5) comprises a first winding and a second winding; One end of the DC end of the rectifier bridge (61) is grounded, and the other end is respectively connected to the opposite-name end of the first winding, one end of the second resistor (632), one end of the first capacitor (651), and one end of the first electrolytic capacitor (641); The other end of the first electrolytic capacitor (641) is connected to one end of the third resistor (633); The other end of the third resistor (633) is connected to the input end of the negative voltage sampling circuit (381); The other end of the second resistor (632) and the other end of the first capacitor (651) are respectively connected to the cathode of the third diode (623); The anode of the third diode (623) is respectively connected to the drain of the power switch tube (32) and the same-name end of the first winding; The same-name end of the second winding is connected to the anode of the fourth diode (624); The cathode of the fourth diode (624) is connected to one end of the fourth resistor (634); The other end of the fourth resistor (634) is respectively connected to the input end of the first low voltage difference linear voltage regulator circuit (351), the input end of the VCC overvoltage protection circuit (352), the input end of the second low voltage difference linear voltage regulator circuit (353), the second input end of the third low voltage difference linear voltage regulator circuit (354), and one end of the second capacitor (652); The other end of the second capacitor (652), the opposite end of the second winding and the source of the power switch tube (32) are all grounded.

13. A switching power supply according to claim 12, characterized in that: Also includes an output control circuit; The output control circuit is connected to the secondary side of the transformer (5) and the secondary side control circuit (4) respectively.

14. A switching power supply according to claim 13, characterized in that: The secondary side control circuit (4) comprises a synchronous rectification circuit; The processor (2) is connected to the synchronous rectification circuit.

15. A switching power supply according to claim 14, characterized in that: The millimeter wave transmitting end (111) comprises a signal input end, a transmitting power supply end and a transmitting enabling end; The synchronous rectification circuit comprises a detector (411), a voltage regulator (412), a fourth low voltage difference linear voltage regulator circuit (413), an external over-temperature protection circuit (414), a Schmitt trigger (415), a latch shutdown / automatic restart circuit (416), a second comparator (417), a third comparator (418), a NOR operator (419), a first AND operator (420), a first OR operator (421) and a first oscillator (422); The first input terminal and the second input terminal of the detector (411), the first input terminal and the output terminal of the voltage regulator (412), the input terminal and the output terminal of the fourth low voltage difference linear voltage regulator circuit (413), the first output terminal of the external over-temperature protection circuit (414), the positive electrode of the Schmitt trigger (415), the input terminal of the latch shutdown / automatic restart circuit (416), the positive electrode of the second comparator (417), and the positive electrode of the third comparator (418) are respectively connected to the output control circuit; The first output end of the detector (411) is connected to the second input end of the voltage regulator (412), and the second output end is connected to the processor (2); An input end of the external over-temperature protection circuit (414) is connected to the processor (2); The output end of the Schmitt trigger (415) and the output end of the latch shutdown / automatic restart circuit (416) are both connected to the processor (2); The output terminal of the second comparator (417) is connected to the first input terminal of the NOR operator (419); The output terminal of the third comparator (418) is connected to the second input terminal of the NOR operator (419); The output terminal of the NOR operator (419) is connected to the third input terminal of the first AND operator (420); The first input terminal of the first AND operator (420) is connected to the third output terminal of the detector (411); The second input terminal of the first AND operator (420) is connected to the processor (2); The first output terminal and the second output terminal of the first oscillator (422) are connected to the fourth input terminal and the fifth input terminal of the first AND operator (420); The third output terminal of the first oscillator (422) is connected to the processor (2); The first input terminal of the first OR operator (421) is connected to the processor (2); The output end of the first AND operator (420) is connected to the second input end of the first OR operator (421); The output end of the first OR operator (421) is connected to the signal input end of the millimeter wave transmitting end (111); The enabling end of the processor (2) is connected to the transmitting enabling end of the millimeter wave transmitting end (111); The output end of the fourth low voltage difference linear voltage stabilization circuit (413) is connected to the transmitting power supply end of the millimeter wave transmitting end (111).

16. A switching power supply according to claim 15, characterized in that: The output control circuit comprises a first triode (711), a second electrolytic capacitor (72), a fifth resistor (731), a third capacitor (741), a fourth capacitor (742), a sixth resistor (732), a seventh resistor (733) and an eighth resistor (734); The secondary side of the transformer (5) comprises a third winding; The same-name ends of the third winding are respectively connected to one end of the second electrolytic capacitor (72), one end of the sixth resistor (732), the first input end of the detector (411), and the input end of the fourth low-voltage difference linear voltage regulator circuit (413); The other end of the second electrolytic capacitor (72) is respectively connected to the source of the first transistor (711), one end of the third capacitor (741), one end of the fourth capacitor (742), and one end of the eighth resistor (734), and all are grounded; The other end of the sixth resistor (732) is respectively connected to one end of the seventh resistor (733) and the positive electrode of the second comparator (417); The other end of the seventh resistor (733) is respectively connected to the other end of the eighth resistor (734) and the positive electrode of the second comparator (417); The other end of the third capacitor (741) is connected to the output end of the voltage regulator (412) and the positive electrode of the Schmitt trigger (415) respectively; The other end of the fourth capacitor (742) is connected to the output end of the fourth low voltage difference linear voltage stabilization circuit (413); The opposite-name ends of the third winding are respectively connected to the drain of the first transistor (711) and one end of the fifth resistor (731); The source of the first transistor (711) is connected to the processor (2) via a second buffer (401); The other end of the fifth resistor (731) is connected to the second input end of the detector (411).

17. A switching power supply according to claim 16, characterized in that: The secondary side control circuit (4) also includes a charging protocol circuit; The processor (2) is connected to the charging protocol circuit.

18. A switching power supply according to claim 17, characterized in that: The charging protocol circuit also includes a digital controller (423) and a USB PD controller (424); The sixth resistor (732) and the seventh resistor (733) in the output control circuit are replaced by a second transistor (712) and a fifth capacitor (743); The drain of the second transistor (712) is respectively connected to the one end of the second electrolytic capacitor (72), the first input end of the voltage regulator (412), and the input end of the fourth low voltage difference linear voltage regulator circuit (413); The source of the second transistor (712) is respectively connected to one end of the fifth capacitor (743) and the USB PD controller (424); The gate of the second triode (712) is connected to the first output terminal of the digital controller (423); The other end of the fifth capacitor (743) is connected to the other end of the eighth resistor (734); An input end of the digital controller (423) is connected to a first input end of the detector (411); The second output terminal of the digital controller (423) is connected to the positive electrode of the second comparator (417); The USB PD controller (424) is respectively connected to the first input end of the detector (411) and the output end of the fourth low voltage difference linear voltage stabilization circuit (413); The control lines of the digital controller (423) and the control lines of the USB PD controller (424) are connected in sequence.

19. A switching power supply according to any one of claims 11 to 18, characterized in that: The logic control and fault protection circuit (33) includes a fourth comparator (331), a first fault manager (332), a second AND operator (333), a second OR operator (334), a second oscillator (335), a first power manager (336), a fifth comparator (337), a sixth comparator (338) and a third transistor (339); The output end of the AC overvoltage protection circuit (341) is connected to the positive electrode of the fourth comparator (331); The first output terminal of the first power manager (336) is connected to the negative electrode of the fourth comparator (331); The output terminal of the fourth comparator (331) is connected to the first input terminal of the first fault manager (332); The output end of the undervoltage / overvoltage protection circuit (342) is connected to the second input end of the first fault manager (332); The output terminal of the VCC overvoltage protection circuit (352) is connected to the third input terminal of the first fault manager (332); The fourth input terminal of the first fault manager (332) is connected to the output terminal of the internal over-temperature protection circuit; The output end of the first fault manager (332) is inverted and connected to the first input end of the second AND operator (333); The output end of the first low voltage difference linear voltage stabilization circuit (351) is connected to the first input end of the first power manager (336); The second input terminal of the first power manager (336) is connected to the output terminal of the soft start circuit; The second output terminal of the first power manager (336) is connected to the negative electrode of the fifth comparator (337); The third output terminal of the first power manager (336) is connected to the negative electrode of the sixth comparator (338); The fourth output terminal of the first power manager (336) is connected to the first input terminal of the third low voltage difference linear voltage regulator circuit (354); The fifth output terminal of the first power manager (336) is connected to the negative electrode of the first comparator (385); The positive electrode of the fifth comparator (337) is connected to the signal output end of the millimeter wave receiving end (121) via the first buffer (36); The output terminal of the fifth comparator (337) is connected to the second input terminal of the second AND operator (333); A positive input DC voltage to the sixth comparator (338); The output end of the sixth comparator (338) is connected to the receiving enable end of the millimeter wave receiving end (121); The input end of the second oscillator (335) is connected to the output end of the maximum frequency setting circuit (384); The output terminal of the second oscillator (335) is connected to the third input terminal of the AND operator; The output end of the AND operator is connected to the S end of the RS flip-flop (37); The first input terminal of the second OR operator (334) is connected to a maximum on-time setting circuit; The second input terminal of the second OR operator (334) is connected to the output terminal of the first comparator (385); The output terminal of the second OR operator (34) is connected to the R terminal of the RS flip-flop (37); The output end of the X-capacitor discharge circuit (343) is connected to the gate of the third triode (339); The drain of the third triode (339) is connected to the AC input; The source of the third transistor (339) is grounded.

20. The switching power supply according to claim 16, characterized in that: The processor (2) includes a seventh comparator (21), a second power manager (22), an SR drive signal manager (23), a second fault manager (24), an SR enabling circuit (25) and a pulse frequency modulator (26); The output end of the latch shutdown / automatic restart circuit (416) is connected to the input end of the second power manager (22); The second input terminal of the second power manager (22) is connected to the negative electrode of the seventh comparator (21); The other end of the sixth resistor (732) is connected to the positive electrode of the seventh comparator (21); The output end of the seventh comparator (21) is connected to the transmission enable end of the millimeter wave transmitting end (111); The second output end of the external over-temperature protection circuit (414), the output end of the Schmitt trigger (415) and the output end of the latch shutdown / automatic restart circuit (416) are all connected to the input end of the second fault manager (24); The output end of the second fault manager (24), the output end of the pulse frequency modulator (26), the second output end of the detector (411) and the third output end of the first oscillator (422) are all connected to the input end of the SR drive signal manager (23); The first output terminal of the SR driving signal manager (23) is connected to the input terminal of the second buffer (401); The second output terminal of the SR driving signal manager (23) is connected to the first input terminal of the first OR operator (421); The third output terminal of the SR driving signal manager (23) is connected to the input terminal of the SR enabling circuit (25); The output terminal of the SR enabling circuit (25) is connected to the second input terminal of the first AND operator (420).

21. A switching power supply according to claim 17, characterized in that: The synchronous rectification circuit is a synchronous rectification chip, and the charging protocol circuit is a charging protocol chip.

22. A switching power supply according to claim 21, characterized in that: The synchronous rectification circuit and the charging protocol circuit are respectively integrated in the processor (2).

23. A switching power supply according to claim 22, characterized in that: The processor (2) integrates a plurality of charging protocol circuits.

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