Circuit for reducing output no-load of high-power two-in-one power supply

Abstract

The utility model discloses a circuit for reducing output no-load of a high-power two-in-one power supply, and the circuit comprises an AC-DC circuit which is electrically connected with a DC-DC circuit. The AC-DC circuit comprises a filter circuit, the filter circuit is electrically connected with a transformer circuit, the transformer circuit is electrically connected with a synchronous rectification circuit, the synchronous rectification circuit is electrically connected with a feedback circuit, the feedback circuit is electrically connected with a PWM control circuit, and the PWM control circuit is electrically connected with the transformer circuit; the synchronous rectification circuit is also electrically connected with the BUCK-C1 circuit, the BUCK-C2 circuit and the Buck Boost circuit, and the Buck Boost circuit is electrically connected with the battery cell; and the BUCK-C1 circuit and the BUCK-C2 circuit are electrically connected with the MCU control circuit. The circuit is simple, small in size, low in cost and easy to implement and maintain; the operation efficiency of the power supply is optimized, and the no-load loss is reduced; the performance and the stability of the equipment are improved, and the service life and the safety of the power supply are improved.

Description

Technical Field

[0001] The utility model relates to the field of electricity, in particular to a circuit for reducing the output no-load of a high-power two-in-one power supply. Background Art

[0002] In the application of high-frequency switching power supplies with multiple outputs, there is usually a poor load regulation rate. In order to improve the load regulation rate, engineers increase the DC-DC conversion circuit regardless of the cost. The regulation rate is improved, but the cost also increases greatly. Or, the subsequent stage uses a line voltage stabilization circuit to achieve output voltage stability, but this leads to a significant decrease in power supply efficiency and an increase in no-load power consumption.

[0003] With the rapid development of consumer electronic products, there is an increasing demand for charging devices, higher requirements for fast charging, more and more demand for multi-port chargers, and more and more devices with multi-application charging scenarios. A two-in-one power supply is a common type of power supply that integrates two or more power units into one module to achieve higher power density and better heat dissipation performance. However, in the design and manufacturing process of this type of power supply, the problem of high output no-load is often encountered, resulting in reduced power efficiency and device performance, and it will also affect the service life of the power supply, and may also cause damage to the connected devices. Therefore, a solution is needed to solve these problems. Utility Model Content

[0004] In order to solve the above technical problems, the utility model proposes a circuit for reducing the no-load output of a high-power two-in-one power supply.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A circuit for reducing no-load output of a high-power two-in-one power supply comprises an AC-DC circuit, wherein the AC-DC circuit comprises a filter circuit, the filter circuit is electrically connected to a transformer circuit, the transformer circuit is electrically connected to a synchronous rectification circuit, the synchronous rectification circuit is electrically connected to a feedback circuit, the feedback circuit is electrically connected to a PWM control circuit, and the PWM control circuit is electrically connected to the transformer circuit; the synchronous rectification circuit is also electrically connected to a BUCK-C1 circuit, a BUCK-C2 circuit and a DC-DC circuit, the DC-DC circuit is electrically connected to a battery cell; the BUCK-C1 circuit and the BUCK-C2 circuit are electrically connected to an MCU control circuit.

[0007] In a further improvement, the synchronous rectification circuit includes a thirty-second MOS tube Q32 and a one-hundredth MOS tube Q100; the source of the thirty-second MOS tube Q32 is grounded, the gate is electrically connected to the third pin of the eleventh chip U11, and the drain is electrically connected to one end of the one-hundredth resistor R120; the source of the one-hundredth MOS tube Q100 is grounded, the gate is electrically connected to the second pin of the eleventh chip U11, and the drain is electrically connected to one end of the one-hundredth resistor R135; the other end of the one-hundredth resistor R135 is electrically connected to the other end of the one-hundredth resistor R120, one end of the one-hundredth resistor R121, and the voltage regulator TL431. The control electrode of U15, one end of the thirteenth resistor R113, one end of the one hundredth capacitor C104 and one end of the one hundredth capacitor C100; the other end of the thirteenth resistor R113 is electrically connected to the other end of the one hundredth capacitor C100 and one end of the one hundredth resistor R112, and the other end of the one hundredth resistor R112 is electrically connected to one end of the optocoupler EL1018U8A and one end of the fourteenth resistor R114; the other end of the fourteenth resistor R114 is electrically connected to the other end of the optocoupler EL1018U8A, one end of the fifteenth resistor R115 and the cathode end of the regulator TL431 U15, and the anode end of TL431 U15 is grounded; the other end of the fifteenth resistor R115 is electrically connected to the other end of the one hundredth capacitor C104.

[0008] As a further improvement, the model of the eleventh chip U11 is CS32F035K6U6.

[0009] As a further improvement, the control chip of the AC-DC circuit is SC3057B.

[0010] As a further improvement, the control chip of the DC-DC circuit is SC8815.

[0011] As a further improvement, the BUCK-C1 circuit is electrically connected to the PD1 port output, and the BUCK-C2 circuit is electrically connected to the PD2 port output and the USBA output.

[0012] As a further improvement, the model of the control chip of the MCU control circuit is CS32F0350.

[0013] As a further improvement, the DC-DC circuit is a BuckBoost circuit.

[0014] As a further improvement, the BUCK-C1 circuit and the BUCK-C2 circuit both include a BUCK circuit, and the BUCK circuit is electrically connected to the protocol control circuit.

[0015] The beneficial effects of the utility model are:

[0016] 1. Simple circuit, small size and low cost, easy to implement and maintain;

[0017] 2. Optimize the operating efficiency of the power supply and reduce no-load losses;

[0018] 3. Improve the performance and stability of the equipment, and increase the service life and safety of the power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described with reference to the accompanying drawings, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0020] Figure 1 It is the overall logic schematic diagram of the utility model;

[0021] Figure 2 is a circuit diagram of an AC-DC circuit;

[0022] Figure 3 is a circuit diagram of a synchronous rectification circuit;

[0023] Figure 4 is a circuit diagram of a DC-DC circuit;

[0024] Figure 5 This is the circuit diagram of the BUCK circuit;

[0025] Figure 6 is a circuit diagram of a protocol control circuit;

[0026] Figure 7 This is the circuit diagram of the MCU control circuit;

[0027] Figure 8 It is Type-c output circuit;

[0028] Fig. 9 It is the lighting line output circuit;

[0029] Fig.10 This is the USBA output circuit. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and examples.

[0031] Example 1

[0032] The utility model includes AC-DC circuit, DC-DC circuit, BUCK-C1 circuit, protocol IC, BUCK-C2 circuit, protocol IC, and MCU circuit. These circuits are connected by Figure 1 The logical diagram is connected to complete the product functional requirements.

[0033] like Figure 2 As shown: The AC-DC circuit uses Nanxin U4 (SC3057B), and the chip has built-in integrated gallium nitride MOS, which can make the product design more compact and have higher power density.

[0034] like Figure 4 As shown: The DC-DC circuit uses one Southchip U2 (SC8815), and the chip has four external MOS tubes to achieve bridge buck-boost. At the same time, there are many registers inside the chip, which can easily realize battery charge and discharge management.

[0035] The BUCK-C1 circuit includes the BUCK circuit and the protocol control circuit. The BUCK circuit uses the BUCK chip (Ingenic IP6550) + the protocol control circuit uses the Nanxin CS2003, which has CC, D+, and D- signals inside, can provide PD1 port output, and electrically connect the Type-c output circuit.

[0036] The BUCK-C1 circuit also includes the BUCK circuit and the protocol control circuit. The BUCK circuit uses the BUCK chip (Ingenic IP6550) + the protocol control circuit uses the Southchip CS2003, with CC, D+, and D- signals inside, which can provide the PD2 port electrical connection lighting line output circuit and USBA output circuit.

[0037] like Figure 7 As shown: the control chip of the MCU circuit adopts Xinhai CS32F0350, and the control protocol chip realizes multiple control ports, which can be used for many switch signals in the control circuit.

[0038] The product function is realized as follows:

[0039] When there is no external device, the AC-DC outputs 5V to charge the battery. When the battery is fully charged, the no-load power consumption can meet the VI level power consumption requirements. When an external device is plugged in, the AC-DC provides a signal through the MUC, and then notifies Q32 or Q100 to turn on to realize the BUCK circuit operation:

[0040] ① When Q32 and Q100 are turned on at the same time: When an external device is plugged in for charging and 20V is output to the external device, both MOSs will be turned on.

[0041] ② When other devices are plugged in and the output does not provide 20V, only Q32 is turned on and Q100 is turned off.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit the protection scope of the utility model. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A circuit for reducing the no-load output of a high-power two-in-one power supply, characterized in that: It includes an AC-DC circuit, which includes a filter circuit, the filter circuit is electrically connected to a transformer circuit, the transformer circuit is electrically connected to a synchronous rectification circuit, the synchronous rectification circuit is electrically connected to a feedback circuit, the feedback circuit is electrically connected to a PWM control circuit, and the PWM control circuit is electrically connected to the transformer circuit; the synchronous rectification circuit is also electrically connected to a BUCK-C1 circuit, a BUCK-C2 circuit and a DC-DC circuit, the DC-DC circuit is electrically connected to a battery cell; the BUCK-C1 circuit and the BUCK-C2 circuit are electrically connected to an MCU control circuit.

2. The circuit for reducing the no-load output of a high-power two-in-one power supply as claimed in claim 1, characterized in that: The synchronous rectification circuit comprises a thirty-second MOS tube (Q32) and a one-hundredth MOS tube (Q100); the source of the thirty-second MOS tube (Q32) is grounded, the gate is electrically connected to the third pin of the eleventh chip (U11), and the drain is electrically connected to one end of the one-hundredth resistor (R120); the source of the one-hundredth MOS tube (Q100) is grounded, the gate is electrically connected to the second pin of the eleventh chip (U11), and the drain is electrically connected to one end of the one-hundredth resistor (R135); the other end of the one-hundredth resistor (R135) is electrically connected to the other end of the one-hundredth resistor (R120), one end of the one-hundredth resistor (R121), the control electrode of the voltage regulator TL431 (U15), one end of the one-hundredth resistor (R113), and the one-hundredth capacitor ( C104) and one end of the one hundredth capacitor (C100); the other end of the one hundredth resistor (R113) is electrically connected to the other end of the one hundredth capacitor (C100) and one end of the one hundredth resistor (R112), and the other end of the one hundredth resistor (R112) is electrically connected to one end of the optocoupler EL1018 (U8A) and one end of the one hundredth resistor (R114); the other end of the one hundredth resistor (R114) is electrically connected to the other end of the optocoupler EL1018 (U8A), one end of the one hundredth resistor (R115) and the cathode end of the regulator TL431 (U15), and the anode end of the TL431 (U15) is grounded; the other end of the one hundredth resistor (R115) is electrically connected to the other end of the one hundredth capacitor (C104).

3. The circuit for reducing the no-load output of a high-power two-in-one power supply as claimed in claim 2, characterized in that: The model of the eleventh chip (U11) is CS32F035K6U6.

4. The circuit for reducing no-load output of a high-power two-in-one power supply as claimed in claim 1, characterized in that: The model of the control chip of the AC-DC circuit is SC3057B.

5. The circuit for reducing no-load output of a high-power two-in-one power supply as claimed in claim 1, characterized in that: The model of the control chip of the DC-DC circuit is SC8815.

6. The circuit for reducing no-load output of a high-power two-in-one power supply as claimed in claim 1, characterized in that: The BUCK-C1 circuit is electrically connected to the Type-C output circuit, and the BUCK-C2 circuit is electrically connected to the lighting line output circuit and the USBA output circuit.

7. The circuit for reducing no-load output of a high-power two-in-one power supply as claimed in claim 1, characterized in that: The model of the control chip of the MCU control circuit is CS32F0350.

8. The circuit for reducing no-load output of a high-power two-in-one power supply as claimed in claim 1, characterized in that: The DC-DC circuit is a BuckBoost circuit.

9. The circuit for reducing no-load output of a high-power two-in-one power supply as claimed in claim 1, characterized in that: The BUCK-C1 circuit and the BUCK-C2 circuit both include a BUCK circuit, and the BUCK circuit is electrically connected to the protocol control circuit.

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