Low-power-consumption switching power supply driving circuit and switching power supply
By introducing a high-voltage circuit consisting of diodes and resistors and a loop consisting of transistors and MOSFETs into the switching power supply drive circuit, the high energy consumption problem of PWM chips under high voltage input is solved, and a low-power and long-life switching power supply design is achieved.
Patent Information
- Application Number
- CN202423323320.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Existing switching power supply drive circuits cannot limit the high-voltage input state of PWM chips when high voltage is input, resulting in high energy consumption and reduced lifespan of the switching power supply.
A low-power switching power supply drive circuit is adopted. The charging voltage of the pulse width modulation control chip is controlled by a high-voltage circuit composed of diodes and resistors and a circuit composed of transistors and MOSFETs, which cuts off unnecessary charging circuits and reduces power consumption.
It achieves low power consumption, extends the lifespan of the switching power supply, and improves safety and reliability.
Smart Images
Figure CN223713846U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The embodiment of the utility model relates to electronic circuit field, especially a kind of low-power switch power supply drive circuit and switch power supply. BACKGROUND
[0002] Switching power supply is a kind of high-efficiency electric energy conversion device, it is converted into different grades of direct current voltage by the input alternating current or direct current voltage to power various electronic devices, switching power supply has higher efficiency, smaller size and weight, and is widely used in modern electronic products.Switching power supply is used to high-voltage power supply, current limiting is carried out by connecting multiple resistors in series, but the existing switching power supply drive circuit cannot limit high-voltage input, PWM chip is always in high-voltage input state, not only high energy consumption, but also reduce the service life of switching power supply.
[0003] The above problems need to be solved. UTILITY MODEL CONTENT
[0004] Therefore, the utility model provides a kind of low-power switch power supply drive circuit and switch power supply to solve the problems mentioned in the above background art section.
[0005] To achieve the above purpose, the utility model embodiment adopts the following technical scheme:
[0006] First, the utility model embodiment provides a kind of low-power switch power supply drive circuit, the circuit includes diode D1, resistance R1, resistance R2, resistance R3, triode Q1, resistance R4, diode D2, triode Q2 and diode D3;Wherein, the positive pole of diode D1 is connected with control voltage terminal VC, the negative pole of diode D1 is connected with one end of resistance R2, one end of capacitor C1, the other end of resistance R2 is connected with one end of resistance R1, triode Q1 gate, the other end of resistance R1 is connected with the other end of capacitor C1, the source electrode of triode Q1, the other end of resistance R3, the positive pole of diode D2 is grounded GND after connection, the drain electrode of triode Q1 is connected with one end of resistance R4, the other end of resistance R4 is connected with the other end of resistance R3, the negative pole of diode D2, the gate of triode Q2, the positive pole of diode D2 is grounded GND, the source electrode of triode Q2 is connected with the positive pole of diode D3, and the negative pole of diode D3 is connected with power supply terminal VCC.
[0007] Preferably, the low-power switch power supply drive circuit further comprises a first high-voltage circuit;The first high-voltage circuit is composed of resistors R5 to R13 connected in series with each other, and the input end of the first high-voltage circuit is connected to the high-voltage terminal VH, and the output end is connected to the gate of triode Q2.
[0008] Preferably, the low-power switching power supply driving circuit further comprises a second high-voltage circuit; the second high-voltage circuit is composed of diode D4, resistor R14 to resistor R21 connected in series with each other, and the input end of the second high-voltage circuit is connected to the high-voltage terminal VH through the diode D4, and the output end is connected to the drain of the triode Q2.
[0009] Preferably, the triode Q1 and the triode Q2 are both MOS tubes.
[0010] In the second aspect, the utility model embodiment further provides a switching power supply, the switching power supply includes low-power switching power supply driving circuit;The low-power switching power supply driving circuit includes diode D1, resistor R1, resistor R2, resistor R3, triode Q1, resistor R4, diode D2, triode Q2 and diode D3, wherein the positive pole of diode D1 is connected with control voltage terminal VC, and the negative pole of diode D1 is connected with one end of resistor R2 and one end of capacitor C1, the other end of resistor R2 is connected with one end of resistor R1 and the gate of triode Q1, the other end of resistor R1 is connected with the other end of capacitor C1, the source of triode Q1, the other end of resistor R3 and the positive pole of diode D2 and then is connected to ground GND, the drain of triode Q1 is connected with one end of resistor R4, the other end of resistor R4 is connected with the other end of resistor R3, the negative pole of diode D2 and the gate of triode Q2, the positive pole of diode D2 is connected to ground GND, the source of triode Q2 is connected with the positive pole of diode D3, and the negative pole of diode D3 is connected with power terminal VCC.
[0011] Preferably, the low-power switching power supply driving circuit further comprises a first high-voltage circuit; the first high-voltage circuit is composed of resistor R5 to resistor R13 connected in series with each other, and the input end of the first high-voltage circuit is connected to the high-voltage terminal VH, and the output end is connected to the gate of the triode Q2.
[0012] Preferably, the low-power switching power supply driving circuit further comprises a second high-voltage circuit; the second high-voltage circuit is composed of diode D4, resistor R14 to resistor R21 connected in series with each other, and the input end of the second high-voltage circuit is connected to the high-voltage terminal VH through the diode D4, and the output end is connected to the drain of the triode Q2.
[0013] Preferably, the triode Q1 and the triode Q2 are both MOS tubes.
[0014] The technical scheme of the embodiment of the utility model realizes energy saving and efficiency increasing, can avoid the pulse width modulation control chip being in high voltage input state for a long time, is safe and reliable, prolongs the service life, and reduces the hard consumption of the whole power supply and the power consumption. BRIEF DESCRIPTION OF DRAWINGS
[0015] In order to make the technical scheme in the embodiment of the utility model clearer and more understandable, the drawings needed in the background art, embodiment description of the utility model will be briefly introduced as follows, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the content of the embodiment of the utility model and these drawings without creative labor.
[0016] Figure 1 The low-power switch power supply drive circuit circuit structure diagram provided by the embodiment of the utility model. DETAILED DESCRIPTION
[0017] In order to make the technical scheme in the embodiment of the utility model clearer and more understandable, the drawings needed in the background art, embodiment description of the utility model will be briefly introduced as follows, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the content of the embodiment of the utility model and these drawings without creative labor.
[0018] Embodiment one
[0019] As shown in the formula (1), the low-power switch power supply drive circuit circuit structure diagram provided by the embodiment of the utility model. Figure 1 Figure 1 The low-power switch power supply drive circuit circuit structure diagram provided by the embodiment of the utility model.
[0020] The embodiment provides a low-power consumption switching power supply driving circuit, which comprises a diode D1, a resistor R1, a resistor R2, a resistor R3, a triode Q1, a resistor R4, a diode D2, a triode Q2 and a diode D3; wherein the positive electrode of the diode D1 is connected with a control voltage terminal VC, the negative electrode of the diode D1 is connected with one end of the resistor R2 and one end of a capacitor C1, the other end of the resistor R2 is connected with one end of the resistor R1 and the gate of the triode Q1, the other end of the resistor R1 is connected with the other end of the capacitor C1, the source of the triode Q1, the other end of the resistor R3 and the positive electrode of the diode D2, the other end of the resistor R3 is connected with the other end of the resistor R4, the negative electrode of the diode D2 and the gate of the triode Q2, the positive electrode of the diode D2 is grounded GND, the source of the triode Q2 is connected with the positive electrode of the diode D3, and the negative electrode of the diode D3 is connected with a power supply terminal VCC.
[0021] In the embodiment, the low-power consumption switching power supply driving circuit further comprises a first high-voltage circuit; the first high-voltage circuit is composed of resistors R5 to R13 connected in series with each other, the input end of the first high-voltage circuit is connected with a high-voltage terminal VH, and the output end of the first high-voltage circuit is connected with the gate of the triode Q2.
[0022] In the embodiment, the low-power consumption switching power supply driving circuit further comprises a second high-voltage circuit; the second high-voltage circuit is composed of a diode D4 and resistors R14 to R21 connected in series with each other, the input end of the second high-voltage circuit is connected with the high-voltage terminal VH through the diode D4, and the output end of the second high-voltage circuit is connected with the drain of the triode Q2.
[0023] In the embodiment, the triode Q1 and the triode Q2 are both MOS tubes.
[0024] In operation, when the power supply is started, the diode D4, the resistors R14 to R21 and the triode Q2 charge the power supply terminal VCC of the pulse width modulation control chip of the switching power supply, the resistors R5 to R13 and the diode D2 control the charging voltage, when the pulse width modulation control chip is normally started, the diode D1, the resistor R1, the resistor R2 and the triode Q1 circuit controlled by the control voltage terminal VC are used to close the resistors R14 to R21 and the diode D2 circuit, so as to cut off the charging circuit of the power supply terminal VCC, thereby reducing the hard consumption of the whole power supply, reducing the power consumption, realizing energy saving and efficiency increasing, avoiding the pulse width modulation control chip being in the high-voltage input state for a long time, being safe and reliable, and prolonging the service life.
[0025] Embodiment two
[0026] The embodiment also provides a switching power supply, which comprises a low-power switching power supply driving circuit; the low-power switching power supply driving circuit comprises a diode D1, a resistor R1, a resistor R2, a resistor R3, a triode Q1, a resistor R4, a diode D2, a triode Q2 and a diode D3; wherein the positive electrode of the diode D1 is connected with a control voltage terminal VC, the negative electrode of the diode D1 is connected with one end of the resistor R2 and one end of a capacitor C1, the other end of the resistor R2 is connected with one end of the resistor R1 and the gate of the triode Q1, the other end of the resistor R1 is connected with the other end of the capacitor C1, the source of the triode Q1, the other end of the resistor R3 and the positive electrode of the diode D2, the ground GND is connected after that, the drain of the triode Q1 is connected with one end of the resistor R4, the other end of the resistor R4 is connected with the other end of the resistor R3, the negative electrode of the diode D2 and the gate of the triode Q2, the positive electrode of the diode D2 is connected with the ground GND, the source of the triode Q2 is connected with the positive electrode of the diode D3, and the negative electrode of the diode D3 is connected with a power supply terminal VCC. The low-power switching power supply driving circuit further comprises a first high-voltage circuit; the first high-voltage circuit is composed of resistors R5 to R13 connected with each other in series, the input end of the first high-voltage circuit is connected with a high-voltage terminal VH, and the output end of the first high-voltage circuit is connected with the gate of the triode Q2. The low-power switching power supply driving circuit further comprises a second high-voltage circuit; the second high-voltage circuit is composed of a diode D4 and resistors R14 to R21 connected with each other in series, the input end of the second high-voltage circuit is connected with the high-voltage terminal VH through the diode D4, and the output end of the second high-voltage circuit is connected with the drain of the triode Q2. The triode Q1 and the triode Q2 are both MOS tubes.
[0027] In operation, when the power supply is started, the diode D4, the resistors R14-R21 and the triode Q2 charge the power supply terminal VCC of the pulse width modulation control chip of the switching power supply, the resistors R5-R13 and the diode D2 control the charging voltage, when the pulse width modulation control chip is started normally, the diode D1, the resistor R1, the resistor R2 and the triode Q1 circuit controlled by the control voltage terminal VC is used to close the resistor R14-R21 and the diode D2 circuit, so as to cut off the charging circuit of the power supply terminal VCC, thereby reducing the hard consumption of the whole power supply, reducing the power consumption, realizing energy saving and efficiency increasing, and avoiding the pulse width modulation control chip being in the high-voltage input state for a long time, so as to be safe and reliable and prolong the service life.
[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A low-power switching power supply drive circuit, characterized in that, It includes diode D1, resistance R1, resistance R2, resistance R3, triode Q1, resistance R4, diode D2, triode Q2 and diode D3;Among them, the positive electrode of diode D1 is connected with control voltage terminal VC, the negative electrode of diode D1 is connected with one end of resistance R2 and one end of capacitor C1, the other end of resistance R2 is connected with one end of resistance R1 and triode Q1 gate, the other end of resistance R1 is connected with the other end of capacitor C1, triode Q1 source, the other end of resistance R3 and the positive electrode of diode D2, and then grounded GND, the drain of triode Q1 is connected with one end of resistance R4, the other end of resistance R4 is connected with the other end of resistance R3, the negative electrode of diode D2 and triode Q2 gate, the positive electrode of diode D2 is grounded GND, the source of triode Q2 is connected with the positive electrode of diode D3, and the negative electrode of diode D3 is connected with power terminal VCC.
2. The low power consumption switching power supply driving circuit according to claim 1, wherein It also includes a first high-voltage circuit;The first high-voltage circuit is composed of resistors R5 to R13 connected in series with each other, the input end of the first high-voltage circuit is connected with high-voltage terminal VH, and the output end is connected with the gate of triode Q2.
3. The low power consumption switching power supply driving circuit according to claim 2, wherein The low-power switch power supply driving circuit further comprises a second high-voltage circuit;The second high-voltage circuit is composed of diode D4, resistors R14 to R21 connected in series with each other, the input end of the second high-voltage circuit is connected with high-voltage terminal VH through diode D4, and the output end is connected with the drain of triode Q2.
4. The low power consumption switching power supply drive circuit according to one of claims 1 to 3, characterized in that, The triode Q1 and triode Q2 are both MOS tubes.
5. A switching power supply, characterized by comprising: The switch power supply comprises a low-power switch power supply driving circuit;The low-power switch power supply driving circuit comprises diode D1, resistance R1, resistance R2, resistance R3, triode Q1, resistance R4, diode D2, triode Q2 and diode D3;Among them, the positive electrode of diode D1 is connected with control voltage terminal VC, the negative electrode of diode D1 is connected with one end of resistance R2 and one end of capacitor C1, the other end of resistance R2 is connected with one end of resistance R1 and triode Q1 gate, the other end of resistance R1 is connected with the other end of capacitor C1, triode Q1 source, the other end of resistance R3 and the positive electrode of diode D2, and then grounded GND, the drain of triode Q1 is connected with one end of resistance R4, the other end of resistance R4 is connected with the other end of resistance R3, the negative electrode of diode D2 and triode Q2 gate, the positive electrode of diode D2 is grounded GND, the source of triode Q2 is connected with the positive electrode of diode D3, and the negative electrode of diode D3 is connected with power terminal VCC.
6. The switching power supply of claim 5, wherein The low-power switch power supply driving circuit further comprises a first high-voltage circuit;The first high-voltage circuit is composed of resistors R5 to R13 connected in series with each other, the input end of the first high-voltage circuit is connected with high-voltage terminal VH, and the output end is connected with the gate of triode Q2.
7. The switching power supply of claim 6, wherein The low-power switch power supply driving circuit further comprises a second high-voltage circuit;The second high-voltage circuit is composed of diode D4, resistors R14 to R21 connected in series with each other, the input end of the second high-voltage circuit is connected with high-voltage terminal VH through diode D4, and the output end is connected with the drain of triode Q2.
8. Switching power supply according to one of the claims 5 to 7, characterized in that The triode Q1 and the triode Q2 are MOS transistors. The triode Q1 and the triode Q2 are MOS transistors. The triode Q1 and