A switching power supply

Abstract

The present invention discloses a switching power supply, which includes a primary control circuit, a secondary control circuit, a processor, and a millimeter-wave transmission circuit; the primary control circuit, the secondary control circuit, the processor, and the millimeter-wave transmission circuit are integrated on the same chip; the processor is connected to the primary control circuit through the millimeter-wave transmission circuit; the processor is connected to the secondary control circuit; the isolation degree of the millimeter-wave transmission circuit ensures the safety distance requirement between the primary control circuit and the secondary control circuit, thereby realizing a single-chip design in which the primary control circuit and the secondary control circuit are packaged together. The single-chip design not only simplifies the design and reduces the volume of the switching power supply, but also can reduce EMI interference. In addition, the control of the primary control circuit is directly generated by the processor, and the control signal is transmitted by the processor via the millimeter-wave transmission circuit, greatly improving the transmission speed of the control signal, with small delay and high efficiency.

Description

Technical Field

[0001] The present invention relates to the field of electric energy conversion, and particularly to a switching power supply. Background Art

[0002] A switching power supply is a high-frequency electric energy conversion device, which usually converts the input AC power into a specific form of DC power for charging load devices. By controlling the closing and opening of the switch, the working power of the power transformer is controlled to meet the requirements of different power circuits. Switching power supplies are widely used in fields such as automatic control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, and power equipment.

[0003] Most of the existing primary and secondary side controls of switching power supplies are discrete components, such as Figure 1 As shown, the switching power supply includes a switching power supply chip on the primary side, a synchronous rectification chip and a charging protocol chip on the secondary side. The discrete design between the switching power supply chip, the synchronous rectification chip and the charging protocol chip is to meet the safety distance requirements of safety regulations. Therefore, the design of the existing switching power supply not only causes complex design and large volume, but also leads to problems such as large EMI interference. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide a switching power supply that realizes a small volume design of the switching power supply while reducing EMI interference.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is:

[0006] A switching power supply includes a primary side control circuit and a secondary side control circuit, and further includes a processor and a millimeter wave transmission circuit;

[0007] The primary side control circuit, the secondary side control circuit, the processor and the millimeter wave transmission circuit are integrated on the same chip;

[0008] The processor is connected to the primary side control circuit through the millimeter wave transmission circuit;

[0009] The processor is connected to the secondary side control circuit.

[0010] Further, the millimeter wave transmission circuit includes a millimeter wave transmitting circuit and a millimeter wave receiving circuit;

[0011] 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;

[0012] The other end of the millimeter wave receiving circuit is connected to the primary side control circuit.

[0013] Further, the millimeter-wave transmission circuit is a millimeter-wave transmission chip.

[0014] Further, the primary-side control circuit is a switching power supply chip.

[0015] Further, the primary-side control circuit includes a driver and a power switch;

[0016] The processor is connected to the input end of the driver through the millimeter-wave transmission circuit;

[0017] The output end of the driver is connected to the power switch.

[0018] Further, the secondary-side control circuit includes a synchronous rectification circuit and a charging protocol circuit;

[0019] The processor is respectively connected to the synchronous rectification circuit and the charging protocol circuit.

[0020] Further, the synchronous rectification circuit is a synchronous rectification chip, and the charging protocol circuit is a charging protocol chip.

[0021] Further, the synchronous rectification circuit and the charging protocol circuit are respectively integrated in the processor.

[0022] Further, multiple charging protocol circuits are integrated in the processor.

[0023] The beneficial effects of the present invention are as follows: The primary-side control circuit and the secondary-side control circuit of the switching power supply are integrated on the same chip, and a processor is provided on the single chip. The processor realizes the control of the primary-side control circuit and the secondary-side control circuit. At the same time, communication between the processor and the primary-side control circuit is carried out via the millimeter-wave transmission circuit. The isolation degree of the millimeter-wave transmission circuit ensures the safety distance requirement between the primary-side control circuit and the secondary-side control circuit. Thus, a single-chip design in which the primary-side control circuit and the secondary-side control circuit are packaged together is also realized. The single-chip design has a simple structure, which not only ensures the simplicity and miniaturization 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 both generated by the processor, the control of the primary-side control circuit does not require the feedback of 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. Therefore, the transmission speed of the control signal is also greatly improved, with small delay and high efficiency. Description of the Drawings

[0024] Figure 1 It is a circuit structure schematic diagram of the primary and secondary side control circuits of a switching power supply in the prior art;

[0025] Figure 2 It is a circuit structure schematic diagram of a switching power supply according to an embodiment of the present invention;

[0026] Figure 3 Schematic diagram of the internal structure of a processor of a switching power supply according to an embodiment of the present invention;

[0027] Figure 4 Schematic diagram of the circuit connection of a processor of a switching power supply according to an embodiment of the present invention. Detailed implementation manners

[0028] To describe in detail the technical content, achieved object and effect of the present invention, the following is described in conjunction with the implementation manners and with reference to the accompanying drawings.

[0029] 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. The following is described through specific implementation manners.

[0030] In an alternative embodiment, please refer to Figure 2 , a switching power supply, including a primary control circuit and a secondary control circuit, further including a processor and a millimeter-wave transmission circuit;

[0031] The primary control circuit, secondary control circuit, processor and millimeter-wave transmission circuit are integrated on the same chip;

[0032] The processor is connected to the primary control circuit through the millimeter-wave transmission circuit;

[0033] The processor is connected to the secondary control circuit.

[0034] In order to achieve millimeter-wave transmission, in an alternative embodiment, the millimeter-wave transmission circuit includes a millimeter-wave transmitting circuit and a millimeter-wave receiving circuit;

[0035] 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;

[0036] The other end of the millimeter-wave receiving circuit is connected to the primary control circuit. Among them, the processor transmits a pulse width modulation (PWM) signal through the millimeter-wave transmitting circuit and receiving circuit. The PWM signal is directly output by the processor to the primary control circuit without the feedback of the secondary control circuit;

[0037] In this embodiment, the signal transmission between the processor and the primary control circuit is realized by means of the millimeter-wave transmission circuit. Since the millimeter-wave transmission circuit realizes signal transmission by means of millimeter waves, it plays a role in isolating the primary control circuit and the secondary control circuit in space. At the same time, the control signal of the primary control circuit is directly sent by the processor through the millimeter-wave transmission circuit, greatly improving the signal transmission speed.

[0038] In another alternative embodiment, the millimeter-wave transmission circuit is a millimeter-wave transmission chip. Through chip design, the volume of the switching power supply can be further reduced, realizing a thinner and lighter design of the device.

[0039] In another alternative embodiment, the primary-side control circuit is a switching power supply chip. In this embodiment, the volume of the switching power supply is further reduced through the chip design of the primary-side control circuit.

[0040] As Figure 3 shown, in an alternative embodiment, the primary-side control circuit includes a driver Driver and a power switching transistor GaN;

[0041] The processor is connected to the input end of the driver through the millimeter-wave transmission circuit;

[0042] The output end of the driver is connected to the power switching transistor;

[0043] Specifically, the processor transmits a PWM signal to the driver Driver through the millimeter-wave transmission circuit. The driver Driver controls the operation of the power switching transistor GaN under the control of the PWM signal. GaN outputs to drive the transformer T. HV is the primary-side high-voltage power supply pin, D is the drain pin of GaN, S is the source pin of GaN, and S is connected to the primary-side ground;

[0044] In this embodiment, the processor uses a 110x series processor.

[0045] In another alternative embodiment, the secondary-side control circuit includes a synchronous rectification circuit and a charging protocol circuit;

[0046] The processor is respectively connected to the synchronous rectification circuit and the charging protocol circuit;

[0047] In this embodiment, the processor realizes unified control of the synchronous rectification and charging protocol circuits in the secondary-side control circuit.

[0048] In another alternative embodiment, in order to further realize a thinner and lighter design, the synchronous rectification circuit is a synchronous rectification chip, and the charging protocol circuit is a charging protocol chip.

[0049] In another alternative embodiment, the synchronous rectification circuit and the charging protocol circuit are respectively integrated in the processor, that is, the synchronous rectification circuit and the charging protocol circuit are embedded inside the processor to realize the synchronous rectification function and the charging function, thereby further reducing the volume of the switching power supply through integrated design;

[0050] Specifically, as Figure 2 、 4As shown, the 110x processor provides PWM OUTPUT pin, SR pin, GND pin, VOUT pin, DM pin, DP pin, CC1 pin and CC2 pin externally. After the 110x processor is connected to the primary control circuit including the driver and the power switch GaN via the millimeter-wave transmission circuit, the entire single chip mainly provides HV pin, D pin, S pin, SR pin, GND pin, VOUT pin, DM pin, DP pin, CC1 pin and CC2 pin externally. Among them, the HV pin is the primary 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 synchronous rectification output, DM / DP are the USB Type-C signal pins, and the CC1 / CC2 pins are the USB Type-C detection pins. Then, in specific use, it can be connected to the corresponding circuit of the switching power supply according to the corresponding pins with reference to Figure 1 shown in the figure;

[0051] In another alternative embodiment, as Figure 3 shown, the entire millimeter-wave transmission control chip can adopt a PIP co-packaging structure. The millimeter-wave transmission control chip includes a 110x series controller, two-way millimeter-wave transmission isolators, a driver, and a GaN high-power switch tube. The operation of 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, and can support more fast charging according to relevant charging protocols added by different manufacturers, that is, multiple charging protocol circuits can be integrated in the 110x series controller. Thus, the flexibility of the switching power supply for charging is improved.

[0052] When the above millimeter-wave transmission control chip is applied to an actual switching power supply, as Figure 2 shown, the switching power supply includes an input EMI filter circuit, a rectifier bridge circuit, a coupling transformer T, 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 externally the pins required for each circuit signal in the switching power supply circuit, and 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.

[0053] In summary, a switching power supply provided by the present invention integrates the primary control circuit and the secondary control circuit of the switching power supply on the same chip, and a processor is provided on the single chip. The processor is used to control the primary control circuit and the secondary control circuit. At the same time, communication is carried out between the processor and the primary control circuit via a millimeter-wave transmission circuit. The isolation degree of the millimeter-wave transmission circuit ensures the safety distance requirement between the primary control circuit and the secondary control circuit. Thus, a single-chip design in which the primary control circuit and the secondary control circuit are packaged together is also realized, and the primary control circuit, the secondary control circuit, and the millimeter-wave transmission circuit are all designed in a chip form. The single-chip design and the chip-based design not only ensure the simplicity and small size of the switching power supply design, but also can reduce EMI interference. In addition, since the control signals of the primary control circuit and the secondary control circuit are both generated by the processor, the control of the primary control circuit does not require the feedback of the secondary 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. Therefore, the transmission speed of the control signal is also greatly improved, with small delay and high efficiency.

[0054] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A switching power supply, comprising a primary control circuit and a secondary control circuit, characterized in that It also includes 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 the same chip; The processor is connected to the primary-side control circuit through the millimeter-wave transmission circuit; The processor is connected to the secondary-side control circuit; The control signals of the primary-side control circuit and the secondary-side control circuit are both 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; The secondary-side control circuit includes a synchronous rectification circuit; The processor is connected to the synchronous rectification circuit; The synchronous rectification circuit is integrated within the processor.

2. The switching power supply according to claim 1, characterized in that, The millimeter-wave transmission circuit includes a millimeter-wave transmitting circuit and a millimeter-wave receiving circuit; 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; The other end of the millimeter-wave receiving circuit is connected to the primary-side control circuit.

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

4. A switching power supply according to claim 1, wherein, The primary-side control circuit 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 includes a driver and a power switch transistor; The processor is connected to the input end of the driver through the millimeter-wave transmission circuit; The output end of the driver is connected to the power switch transistor.

6. A switching power supply according to claim 1, characterized in that, The secondary-side control circuit further includes a charging protocol circuit; The processor is connected to the charging protocol circuit; 7. A switching power supply according to claim 6, wherein, The synchronous rectification circuit is a synchronous rectification chip, and the charging protocol circuit is a charging protocol chip.

8. A switching power supply according to claim 6 or 7, characterized in that, The charging protocol circuit is integrated within the processor.

9. A switching power supply according to claim 8, wherein, Multiple charging protocol circuits are integrated within the processor.

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