A high efficiency power supply circuit
By using the auxiliary power supply only when power is started in a high-efficiency power supply circuit and disconnecting the auxiliary circuit after the output voltage is normal, the loss problem caused by the long-term operation of the auxiliary power supply in the prior art is solved, and the efficiency of the switching power supply is improved and in compliance with the Energy efficiency standards.
Patent Information
- Application Number
- CN202110466192.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-04-28
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2041-04-28
AI Technical Summary
The long-term continuous operation of the auxiliary power supply in existing switching power supplies leads to severe losses, reducing working efficiency, increasing efficiency and reducing standby power consumption.
Design a high-efficiency power supply circuit, including PWM IC, control IC, switch conversion rectifier circuit and transistor, etc., and use auxiliary power to power the IC only when the power is powered on and starts. When the output voltage is normal, the auxiliary circuit will be disconnected to reduce the auxiliary power supply. working hours.
The efficiency of switching power supply has been improved from 76% to 88%, reducing the working loss of the power supply circuit and complying with the energy efficiency standards of safety regulations.
Smart Images
Figure CN113179013B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a high-efficiency power supply circuit. Background Art
[0002] Power supply products are widely used in the market, and their demand continues to increase. How to control costs and improve performance has always been an important part of enhancing the competitiveness of power supply products.
[0003] Nowadays, the regulations have higher and higher requirements for the efficiency and standby power consumption of power supply products, so power supplies must use some good materials to improve work efficiency and reduce work loss. On the other hand, the use of good materials will increase the cost accordingly. Therefore, most of them now solve the efficiency and standby power consumption problems by adding high-efficiency power supply circuits. Although the high-efficiency power supply circuit looks simple, it can bring great convenience to the product design requirements in application. However, the circuit in the existing technology can refer to Figure 2 As shown, the IC in the switching power supply is powered by the auxiliary power supply for a long time. The long-term continuous operation of the auxiliary power supply will cause serious losses, thereby reducing the working efficiency of the switching power supply, which needs to be improved. Summary of the invention
[0004] The purpose of the present invention is to provide a high-efficiency power supply circuit, which has a simple and practical circuit, reduces design costs, improves product efficiency, and complies with safety regulations and energy efficiency standards.
[0005] In order to achieve the above object, the solution of the present invention is:
[0006] A high-efficiency power supply circuit comprises a power supply module, wherein the power supply module comprises a PWM IC, a control IC, a switch conversion rectifier circuit and a third diode, wherein the output end of the PWM IC is connected to an external circuit via the switch conversion rectifier circuit, and the input end of the control IC is connected to the output end of the switch conversion rectifier circuit;
[0007] It comprises a triode, a first diode, a second diode, a first MOSFET tube, a second MOSFET tube and a voltage regulator tube, wherein the auxiliary power supply is respectively connected to the collector of the triode, the drain of the first MOSFET tube and the drain of the second MOSFET tube, the emitter of the triode is connected to the positive electrode of the first diode, and the negative electrode of the first diode is connected to the input end of the PWM IC; the base of the triode, the source of the first MOSFET tube and the negative electrode of the voltage regulator tube are connected, the positive electrode of the voltage regulator tube and the source of the second MOSFET tube are grounded together, and the gate of the second MOSFET tube is connected to the output end of the control IC; the positive electrode of the second diode is connected to the output end of the switch conversion rectifier circuit, and the negative electrode of the second diode is connected to the input end of the PWM IC.
[0008] It also includes a third MOSFET tube, the source of the third MOSFET tube is grounded, the gate is connected to the output end of the control IC, and the drain is connected to the base of the triode.
[0009] After adopting the above scheme, the present invention uses the auxiliary power supply to power the IC only when the power supply is turned on. When the output voltage is normal, the startup auxiliary circuit is disconnected and does not work, thereby shortening the working time of the auxiliary power supply and reducing the working loss of the power supply circuit, which is equivalent to improving the efficiency of the switching power supply. Taking the circuit with an output of 12V / 10A as an example, the efficiency of the existing power supply circuit is 76%, while the efficiency of the power supply circuit provided by the present invention can reach 88%. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 is a circuit diagram of the present invention;
[0011] Figure 2 It is a circuit diagram of the prior art. DETAILED DESCRIPTION
[0012] The technical solutions and beneficial effects of the present invention will be described in detail below with reference to the accompanying drawings.
[0013] like Figure 1 As shown, the present invention provides a high-efficiency circuit, including a resistor R59, a resistor R60, a triode Q53, a MOSFET tube Q52, a MOSFET tube Q54, a resistor R61, a voltage regulator tube ZD51, a MOSFET tube Q55, a resistor R63, a diode D53 and a resistor R62, wherein the auxiliary power supply is respectively connected to one end of R59, one end of R60, and the collector of Q53, the other end of R59 is connected to the drain of Q52, the other end of R60 is connected to the gate of Q52, the other end of R60 is connected to the gate of Q52, and the other end of R60 is connected to the gate of Q52. The gate of 52 is also commonly connected to the drain of Q54, and the gate of Q54 is connected to the power supply module; the source of Q52 is respectively connected to the base of Q53, one end of R61, and the negative electrode of ZD51, the source of Q54 is respectively connected to the positive electrode of ZD51, the source of Q55, and one end of R63, the emitter of Q53 is connected to the positive electrode of D53, and the negative electrode of D53 is connected to the power supply module; the drain of Q55 is connected to the other end of R61, the gate of Q55 is respectively connected to the other end of R63 and one end of R62, and the other end of R62 is connected to the power supply module.
[0014] In this embodiment, the structure of the power supply module includes a PWM IC, a control IC and a switching conversion rectifier circuit, wherein the input end of the PWM IC is connected to the negative pole of D53, and the output end of the PWM IC is connected to the external circuit via the switching conversion rectifier circuit. The input end of the PWM IC is also connected to the negative pole of the diode D54, and the positive pole of D54 is connected to the output end of the switching conversion rectifier circuit; the input end of the control IC is connected to the output end of the switching conversion rectifier circuit, and the output end of the control IC is respectively connected to the other end of R62 and the gate of Q54.
[0015] The working principle of the present invention is as follows: when the machine is turned on, the auxiliary power supply provides a voltage for the collector of Q53, and the auxiliary power supply also provides a voltage for the drain of Q52 through R59 and provides a voltage for the gate of Q52 through R60. When the control IC does not detect the output voltage, Q54 and Q55 do not work, and the voltage of the auxiliary power supply directly turns on Q52 through R59 and R60. At this time, the base power supply of Q53 will be stabilized at a fixed voltage value due to ZD51, so that Q53 is turned on and the PWM IC is powered through D53 to achieve the effect of starting the machine; after the PWM IC is powered on, the switch conversion rectifier circuit supplies power, and the switch conversion rectifier circuit outputs a 12V voltage after rectifying the voltage, and the 12V voltage is supplied to the PWM through D54. IC is powered, and voltage is provided to the control IC through D55; when the control IC detects a 12V voltage, a high level is sent to the gate of Q54, Q54 and Q55 are turned on, Q54 is turned on and then the gate voltage of Q52 is lowered to turn off Q52, resulting in a decrease in the base voltage of Q53 and thus turning off, thereby disconnecting the auxiliary power supply, saving the loss of the auxiliary power supply to IC for a long time, and improving the overall working efficiency of the power supply. In addition, in order to prevent malfunction, this embodiment also connects Q55 to the base of Q53, and uses the conduction of Q55 to further lower the base voltage of Q53, making Q53 further non-conductive, thus providing double insurance.
[0016] The above embodiments are only for illustrating the technical idea of the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention.
Claims
1. A high-efficiency power supply circuit, comprising a power supply module, wherein the power supply module comprises a PWM IC, a control IC, a switch conversion rectifier circuit and a third diode (D55), wherein: The output end of the PWM IC is connected to the external circuit via the switch conversion rectifier circuit, and the input end of the control IC is connected to the output end of the switch conversion rectifier circuit; it is characterized by comprising a triode (Q53), a first diode (D53), a second diode (D54), a first MOSFET tube (Q52), a second MOSFET tube (Q54) and a voltage regulator tube (ZD51), wherein the auxiliary power supply is respectively connected to the collector of the triode (Q53), the drain of the first MOSFET tube (Q52), and the drain of the second MOSFET tube (Q54), the emitter of the triode (Q53) is connected to the positive electrode of the first diode (D53), and the negative electrode of the first diode (D53) is connected to the PWM The input end of the IC; the base of the triode (Q53), the source of the first MOSFET tube (Q52), and the negative electrode of the voltage regulator tube (ZD51) are connected, the positive electrode of the voltage regulator tube (ZD51) and the source of the second MOSFET tube (Q54) are grounded, and the gate of the second MOSFET tube (Q54) is connected to the output end of the control IC; the positive electrode of the second diode (D54) is connected to the output end of the switch conversion rectifier circuit, and the negative electrode of the second diode (D54) is connected to the input end of the PWM IC; The circuit also includes a third MOSFET tube (Q55), the source of the third MOSFET tube (Q55) is grounded, the gate is connected to the output end of the control IC, and the drain is connected to the base of the triode (Q53).