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A switching power supply based on mos tube

A technology of MOS tube and switching power supply, which is applied in the field of switching power supply based on MOS tube, can solve the problems of switching power supply protection loopholes, clamping diodes that easily increase power conversion power loss, and high requirements for clamping diodes, so as to improve intelligence and safety. performance, reduce operating losses and switching noise, and reduce requirements

Active Publication Date: 2022-06-17
深圳美利晶微电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Switching power supply is widely used in almost all electronic equipment due to its small size, light weight and high efficiency. MOSFET, metal oxide half-field effect tube) work normally, and have high requirements on the clamp diode, and the heat dissipation of the clamp diode is easy to increase the power loss of the power conversion, and it is also necessary to effectively protect the switching power supply, which can ensure the sudden change of the switching power supply Avoid damage to the switching power supply when a fault occurs, but the protection circuit controlled by the microcontroller will stop after the microcontroller is powered off, resulting in a loophole in the protection of the switching power supply

Method used

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  • A switching power supply based on mos tube
  • A switching power supply based on mos tube
  • A switching power supply based on mos tube

Examples

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Effect test

Embodiment 1

[0017] Example 1: see figure 1 , an embodiment of the present invention provides a switching power supply based on a MOS tube. The switching power supply based on a MOS tube includes: a rectification filter module 1, a PFC module 2, a flyback power output module 3, an isolation voltage detection module 4, and a digital control module 5 , switch control module 6;

[0018] Specifically, the rectification filter module 1 is used to convert the input alternating current into smooth direct current;

[0019] The PFC module 2 is connected to the rectification filter module 1 and the flyback power output module 3, and is used to control the direct current output by the rectification filter module 1 to be converted into a high-frequency pulse voltage and input to the flyback power output module 3, using It is used to detect the current signal during operation, and is used to reduce the operating loss and switching noise of the RCD clamp circuit during operation through the auxiliary s...

Embodiment 2

[0025] Example 2: On the basis of Example 1, please refer to figure 2 , in a specific embodiment of the MOS transistor-based switching power supply described in the present invention, the PFC module 2 includes an active clamp output unit 201 and a MOS transistor control unit 202;

[0026] Specifically, the MOS tube control unit 202 is used to control the direct current output from the rectification filter module 1 to be converted into a high-frequency pulse voltage and input to the flyback power output module 3 to detect the current signal during operation;

[0027] The active clamp output unit 201 is used to reduce the operating loss and switching noise of the RCD clamp circuit during operation through the auxiliary switch;

[0028] The input end of the active clamp output unit 201 is connected to the output end of the rectification filter module 1 , the control end of the active clamp output unit 201 is connected to one end of the MOS tube control unit 202 , and the output ...

Embodiment 3

[0035] Example 3: On the basis of Example 2, please refer to image 3 , in a specific embodiment of the MOS transistor-based switching power supply according to the present invention, the active clamp output unit 201 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a first diode D1, a transformer W1, and an intelligent switch S1;

[0036] Specifically, one end of the first resistor R1, one end of the third resistor R3 and one end of the first capacitor C1 are all connected to the first end of the transformer W1, and the other end of the first resistor R1 is connected to the other end of the third resistor R3 , one end of the second resistor R2 and one end of the fourth resistor R4, the other end of the second resistor R2 and the other end of the fourth resistor R4 are connected to the other end of the first capacitor C1, the cathode of the first diode D1 and the intelligent One end of the switch S1 and the ot...

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Abstract

The invention discloses a switching power supply based on a MOS tube, which relates to the technical field of power distribution control, including: a rectification and filtering module, used to convert alternating current into direct current; a PFC module, used to control voltage changes, detect current signals and pass auxiliary switches Reduce working loss and switching noise; the flyback power output module is used for rectification, voltage stabilization and voltage conversion processing; the isolated voltage detection module is used to detect the voltage signal output by the flyback power output module and isolate the transmission; the digital control module, It is used to receive signals, set the protection threshold and control the operation of the module; the switch control module is used for circuit protection self-locking and control the operation of the switching power supply. The switching power supply based on the MOS tube of the present invention reduces the loss and switching noise of the clamping circuit during operation through the auxiliary switch, improves the conversion efficiency of the switching power supply, and adopts circuit self-locking for fault protection, even if it is out of the control of the digital control module, it can still maintain Status of switching power supply protection.

Description

technical field [0001] The invention relates to the technical field of power distribution control, in particular to a switching power supply based on a MOS tube. Background technique [0002] A switching power supply is a power supply that uses modern power electronics technology to stabilize the output voltage. With the development and innovation of power electronic technology, switching power supply technology is also constantly innovating. Switching power supply is widely used in almost all electronic equipment with the characteristics of small size, light weight and high efficiency. It is an indispensable power supply method for the rapid development of today's electronic information industry. The traditional switching power supply adopts RCD clamping circuit to ensure that the MOS tube ( MOSFET, metal oxide semi-field effect transistor) works normally, which requires high clamping diodes, and the heat dissipation of clamping diodes easily increases the power loss of po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M3/156
CPCH02M3/33523H02M3/156
Inventor 刘建灵
Owner 深圳美利晶微电子科技有限公司
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