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Switching power circuit

A switching power supply circuit, control circuit technology, applied in the direction of high-efficiency power electronic conversion, electrical components, regulating electrical variables, etc., can solve the problems of low power density, low operating frequency, low efficiency, etc., achieve high operating frequency, on-state resistance low, high efficiency

Inactive Publication Date: 2020-07-10
镁蓝科技(上海)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional power supply solution based on silicon MOSFET has been unable to meet the actual needs due to the disadvantages of low operating frequency, large size, low power density, and low efficiency.

Method used

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Embodiment Construction

[0028] The embodiment of the present invention provides a switching power supply circuit 10 , and the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] refer to figure 1 , figure 1 It is a structural block diagram of a switching power supply circuit 10 according to an embodiment of the present invention.

[0030] In some embodiments, the switching power supply circuit 10 includes: a voltage conversion module 12 , a second rectification and filtering circuit 13 and a feedback circuit 14 . The voltage conversion module 12 is adapted to convert the first voltage signal it receives into a pulsed AC signal and output it, and the voltage conversion module 12 includes a transistor for controlling the frequency and / or duty cycle of the pulsed AC signal A switch element 122 and a pulse width modulation (Pulse Width Modulation, PWM) control circuit 123 . The second rectification and filtering circuit 13 is coup...

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Abstract

A switching power circuit comprises a voltage conversion module suitable for converting a first voltage signal accessed by the voltage conversion module into a pulse alternating current signal and outputting the pulse alternating current signal, whereinthe voltage conversion module comprises a pulse width modulation control circuit used for controlling the frequency and / or duty ratio of the pulsealternating current signal and a transistor switching element; asecond rectifying and filtering circuit which is coupled with the voltage conversion module and is suitable for converting the pulse alternating current signal output by the voltage conversion module into a second voltage signal and outputting the second voltage signal; afeedback circuit which is suitable for accessing a second voltage signal output by the second rectifying and filtering circuit and outputting a feedback signal for indicating the output voltage of the second rectifying and filtering circuit to the voltage conversion module, wherein the voltage conversion module which is also suitable for adjusting the output voltage of the switching power supply circuit according to the feedback signal, so a flyback quasi-resonant circuit topological structure is formed, and the high frequency and miniaturization of the switching power supply are realized.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a switching power supply circuit. Background technique [0002] The high frequency of switching power supply is an important development direction of modern switching power supply, because high frequency can make switching power supply miniaturized, and then improve the power density of switching power supply, so that switching power supply can enter a wider range of application fields. Especially the application in high-tech field has accelerated the development of switching power supply. Every year, the switching power supply is advancing rapidly towards the direction of lightness, smallness, thinness, low noise, high reliability and anti-interference with a growth rate of more than two digits. [0003] The traditional power supply solution based on silicon MOSFET has been unable to meet the actual needs due to the disadvantages of low operating frequency, large si...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M7/217H02M1/44
CPCH02M1/44H02M3/33523H02M7/217Y02B70/10
Inventor 侯松林岳丹金王凯莉
Owner 镁蓝科技(上海)有限公司
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