Power supply device with low standby power consumption

Abstract

The utility model discloses a power supply device with low standby power consumption, which belongs to the field of power supply circuit design and comprises an alternating current source, a rectifier bridge circuit, a first capacitor, a power supply circuit, a charge pump circuit and a control circuit. The output end of the rectifier bridge circuit is connected with the first capacitor in parallel, the first capacitor is connected with the input end of the power supply circuit in parallel, the output end of the power supply circuit is connected with the input end of the charge pump circuit, and the output of the charge pump circuit is connected with the control circuit and provides electric energy for the control circuit. According to the utility model, the function of converting the power supply voltage from 15V to 5V is realized through the charge pump circuit, and the efficiency is about 70%. If the power consumption of the MCU is 5mA during standby, the charge pump circuit can save 40mW, so that the standby power consumption of household appliances is greatly reduced, the temperature rise of the power supply part is reduced, the service life of the system is prolonged, and the product reliability is improved.

Description

Technical Field

[0001] The utility model relates to the field of power supply circuit design, and in particular to a power supply device with low standby power consumption for electrical appliances. Background Art

[0002] While the standby function in home power supplies provides convenience for users, it also results in significant energy waste. Therefore, it is necessary to reduce standby power consumption. Common solutions include optimizing the light-load efficiency of the ACDC and optimizing the MCU program.

[0003] Under light load conditions, the conversion efficiency of ACDC is often low due to the increased proportion of switching loss and static loss. The current solution to optimize the light load efficiency of ACDC is difficult to further improve, and the cost will further increase.

[0004] The method of optimizing MCU programs can only reduce software system problems, but cannot fundamentally reduce the increased power consumption caused by the various components of the hardware circuit itself.

[0005] Currently, home appliances use non-isolated power supply solutions. On the variable-frequency motor drive board, the MCU's power supply is provided by a low-dropout linear regulator (LDO), which converts 15V to 5V and provides it to the MCU. The efficiency is about 33%, which means low conversion efficiency and high power consumption. Utility Model Content

[0006] The utility model aims to provide a power supply device with low standby power consumption.

[0007] In order to achieve the above-mentioned purpose, the technical solution of this utility model is:

[0008] A power supply device with low standby power consumption includes an AC current source, a rectifier bridge circuit, a first capacitor, a power supply circuit, a charge pump circuit, and a control circuit. The input end of the AC current source is connected in parallel with the input end of the rectifier bridge circuit, the output end of the rectifier bridge circuit is connected in parallel with the first capacitor, the first capacitor is connected in parallel with the input end of the power supply circuit, the output end of the power supply circuit is connected to the input end of the charge pump circuit, and the output of the charge pump circuit is connected to the control circuit to provide electrical energy for the control circuit.

[0009] The charge pump circuit includes a first switch, a second switch, a third switch, a fourth switch, a second capacitor, and a third capacitor. The first switch is connected to the second switch, the second switch is connected in parallel to the fourth switch, one end of the second capacitor is connected to the first switch, and the other end is connected to the third switch, the third switch is connected in parallel to the fourth switch, and one end of the third capacitor is grounded and the other end is connected to an external circuit. During charging, the first switch and the fourth switch are turned on to charge the second capacitor. During discharging, the second switch and the third switch are turned on, and the second capacitor discharges the third capacitor.

[0010] The rectifier bridge circuit includes a first diode, a second diode, a third diode and a fourth diode, the first diode is connected in parallel with the third diode, the second diode is connected in parallel with the fourth diode, the common end of the first diode and the third diode is connected to one end of the first capacitor, and the common end of the second diode and the fourth diode is connected to the other end of the first capacitor.

[0011] The power supply circuit includes a fifth switch and a sixth switch, a first inductor and a fourth capacitor. One end of the fifth switch is connected to the first capacitor. The sixth switch is connected in parallel to the first inductor. The fourth capacitor is connected in parallel to the first inductor.

[0012] In summary, this utility model uses a charge pump circuit to convert the power supply voltage from 15V to 5V, achieving an efficiency of approximately 70%. Assuming the MCU consumes 5mA in standby mode, the charge pump circuit can save 40mW, significantly reducing the appliance's standby power consumption, lowering the power supply's temperature rise, extending the system's lifespan, and improving product reliability.

[0013] In order to make the above features and advantages of the utility model more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a schematic structural diagram of a power supply device with low standby power consumption.

[0015] Figure 2 for Figure 1 Schematic diagram of the charge pump circuit structure.

[0016] Figure 3 This is a specific embodiment of a power supply device with low standby power consumption according to the present invention.

[0017] In the drawings, like reference numerals refer to the same drawing elements.

[0018] Description of reference numerals:

[0019] 1-Rectifier bridge circuit; 2-Power supply circuit; 3-Charge pump circuit; 4-Control circuit. DETAILED DESCRIPTION

[0020] To make the purpose and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figure 1 The figure shows a schematic diagram of a low standby power supply device of the present invention, which includes an AC current source AC, a rectifier bridge circuit 1, an electrolytic capacitor C1, a power supply circuit 2, a charge pump circuit 3, and a control circuit 4. The AC current source AC generates an AC voltage V AC One end of the rectifier bridge circuit 1 is connected to the AC current source, and the other end generates V DC Output to C1. The power supply circuit 2 includes switches Q5, Q6, inductor L and capacitor C4. One end of the power supply circuit 2 is connected to C1, and the other end generates a voltage V in Output to the charge pump circuit 3. The charge pump circuit generates a voltage V out To the control circuit 4.

[0022] This utility model Figure 1 It involves but is not limited to non-isolated power supply solutions, and also includes isolated power supply solutions.

[0023] like Figure 2 The following is the schematic diagram of the charge pump circuit, which includes switches Q1, Q2, Q3, Q4 and capacitors C2 and C3. One end of Q1 is connected to the external input voltage Vin, and the other end is connected to Q2 and C2. One end of Q3 is grounded, and the other end is connected to C2. One end of C3 is grounded, and the other end is connected in parallel with Q2 and Q4 to output V out To the MCU. During charging, Q1 and Q4 are turned on to charge capacitor C2. When charging and discharging reach equilibrium, in the charging stage:

[0024] V in -V C =V out ;

[0025] During discharge, Q2 and Q3 are PWM controlled with a duty cycle of Duty, and capacitor C2 discharges capacitor C3.

[0026] Duty*V C =V out ;

[0027] Combined with the charging formula, we can get:

[0028] V out =V in *Duty / (1+Duty).

[0029] like Figure 3As shown, a specific embodiment of the power supply device with low standby power consumption is shown. The power supply circuit includes a unidirectional rectifier bridge circuit 1, a power supply circuit 2, and a charge pump circuit 3. The single-phase rectifier bridge circuit includes diodes D1 to D4 and a capacitor C1. The cathode of the diode D2 is connected to the anode of the diode D1. The diode D1 and the diode D2 are connected in series in the same direction to form a first bridge arm. The cathode of the diode D4 is connected to the anode of the diode D3. The diode D3 and the diode D4 are connected in series in the same direction to form a second bridge arm. The second bridge arm and the first bridge arm are both connected in parallel with the capacitor C1. The midpoint of the first bridge arm and the midpoint of the second bridge arm are input with the AC voltage V AC , the DC voltage V is output from both ends of the capacitor C1 DC .

[0030] The power IC circuit includes switches Q5~Q6, an inductor L and a capacitor C. One end of the switch Q5 is connected to the input voltage V DC , the other end is connected to the switch Q6 and the inductor L. One end of the switch Q6 is grounded, and the other end is connected to the inductor L. The inductor L and the capacitor C4 are connected in parallel to output a voltage V in .

[0031] The beneficial effects of a low standby power consumption power supply device proposed in this case are:

[0032] This utility model uses a charge pump circuit to convert the power supply voltage from 15V to 5V, with an efficiency of approximately 70%. Assuming the MCU consumes 5mA in standby mode, the charge pump circuit can save 40mW, significantly reducing the standby power consumption of the appliance, lowering the temperature rise of the power supply, extending the system life, and improving product reliability.

[0033] The utility model uses a charge pump circuit to replace a commonly used low-voltage regulator. The charge pump circuit can be designed as a separate charge pump chip or as an integrated power supply chip including the functions of both a power supply and a charge pump.

[0034] Although the present invention has been disclosed above with reference to the embodiments, they are not intended to limit the present invention. Anyone with ordinary skill in the art may make slight modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of the appended patent applications.

Claims

1. A power supply device with low standby power consumption, characterized in that: It includes an AC current source, a rectifier bridge circuit, a first capacitor, a power supply circuit, a charge pump circuit, and a control circuit. The input end of the AC current source is connected in parallel with the input end of the rectifier bridge circuit, the output end of the rectifier bridge circuit is connected in parallel with the first capacitor, the first capacitor is connected in parallel with the input end of the power supply circuit, the output end of the power supply circuit is connected to the input end of the charge pump circuit, and the output of the charge pump circuit is connected to the control circuit to provide electrical energy for the control circuit.

2. A power supply device with low standby power consumption as claimed in claim 1, characterized in that: The charge pump circuit includes a first switch, a second switch, a third switch, a fourth switch, a second capacitor, and a third capacitor, wherein the first switch is connected to the second switch, the second switch is connected in parallel to the fourth switch, one end of the second capacitor is connected to the first switch, and the other end is connected to the third switch, the third switch is connected in parallel to the fourth switch, and one end of the third capacitor is grounded, and the other end is connected to an external circuit; During charging, the first switch and the fourth switch are turned on to charge the second capacitor; during discharging, the second switch and the third switch are turned on to discharge the second capacitor to the third capacitor.

3. A power supply device with low standby power consumption as claimed in claim 2, characterized in that: The rectifier bridge circuit includes a first diode, a second diode, a third diode and a fourth diode, the first diode is connected in parallel with the third diode, the second diode is connected in parallel with the fourth diode, the common end of the first diode and the third diode is connected to one end of the first capacitor, and the common end of the second diode and the fourth diode is connected to the other end of the first capacitor.

4. A power supply device with low standby power consumption as claimed in claim 3, characterized in that: The power supply circuit includes a fifth switch and a sixth switch, a first inductor and a fourth capacitor. One end of the fifth switch is connected to the first capacitor. The sixth switch is connected in parallel to the first inductor. The fourth capacitor is connected in parallel to the first inductor.

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