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Switching power supply circuit and system

A switching power supply circuit, switching power supply technology, applied in control/regulation systems, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of power supply reliability, hidden dangers, affecting the soft start function, etc.

Inactive Publication Date: 2020-01-17
SHANGHAI JUNTAO POWER EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on this, it is necessary to provide a switching power supply circuit and system for the defect that the voltage existing in the capacitor that provides the reference voltage will affect the soft start function when the power is turned on again, and cause hidden dangers in the reliability of the power supply.

Method used

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  • Switching power supply circuit and system
  • Switching power supply circuit and system
  • Switching power supply circuit and system

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Embodiment Construction

[0033] In order to better understand the purpose, technical solution and technical effect of the present invention, the present invention will be further explained below in conjunction with the accompanying drawings and embodiments. At the same time, it is stated that the embodiments described below are only used to explain the present invention, and are not intended to limit the present invention

[0034] An embodiment of the present invention provides a switching power supply circuit.

[0035] figure 1 It is a structural diagram of a switching power supply circuit module in an embodiment, such as figure 1 As shown, the switching power supply circuit in one embodiment includes a switching power supply power stage 100, a soft start circuit 101, a switching control module 102 and a semiconductor switching device 103:

[0036] The switching power supply power stage 100 is used to connect the input voltage of the input voltage source and output the output voltage to supply powe...

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PUM

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Abstract

The invention relates to a switching power supply circuit and system. A switch control module outputs a first switching signal when a reference voltage is greater than a preset voltage value, and outputs a second switching signal when the reference voltage is less than the preset voltage value. When the switching power supply circuit is shut down and the reference voltage is smaller than the preset voltage value, the first switching end and the second switching end of the semiconductor switching device can be switched on, and a semiconductor switching device discharges the voltage of a capacitor providing the reference voltage. Based on this, the process that a soft start circuit outputs a proportion voltage control signal to the switching power supply power stage to carry out soft start is not affected, a surge current and the voltage overshoot are effectively reduced, and the reliability of the switching power supply circuit is improved.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a switching power supply circuit and system. Background technique [0002] Switching power supplies are essential and critical components in modern electronic systems. The switching power supply works by converting the error signal into a duty ratio control signal to drive the switch. In the start-up phase of the DC-DC switching power supply, due to the loop response, the output voltage cannot be established instantaneously, causing the feedback pin voltage to be lower than the reference voltage, causing the error amplifier to work in an unbalanced state, and its output signal is too high. If the circuit is working at 100% duty cycle, there will be a large surge current flowing into the output capacitor, and the output voltage will also have a large overshoot. At the same time, large inrush currents may also damage switching transistors and other devices. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M3/335H02M1/32
CPCH02M1/32H02M1/36H02M3/33523H02M1/0048H02M1/0058Y02B70/10
Inventor 高瑞丽厉干年丁玲李华铭
Owner SHANGHAI JUNTAO POWER EQUIP CO LTD
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