Switching power supply chip and switching power supply circuit

A technology of switching power supply chip and switching power supply circuit, which is applied in the direction of high-efficiency power electronic conversion, electrical components, and adjusting electric variables, etc., and can solve problems such as single output voltage, chip withstand voltage, power consumption requirements are getting higher and higher, and changes
CN114567152AActive Publication Date: 2022-05-31SUZHOU LII SEMICON CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUZHOU LII SEMICON CO LTD
Publication Date
2022-05-31

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Abstract

The invention relates to a switching power supply chip and a switching power supply circuit, the switching power supply chip comprises a power supply module used for providing working voltage for other modules, and the power supply module comprises a charging capacitor; the reference module is used for providing a reference for other modules, and the reference module is electrically connected with the power supply module; the control module is used for outputting a power switch signal subjected to pulse width modulation, the control module comprises a control main module and a driving module, and the input end of the driving module is electrically connected with the control main module; the switching tube group is electrically connected with the output end of the driving module and the power supply, and the switching tube group is connected or disconnected to charge or discharge the charging capacitor; the diode is connected in series between the power supply module and the switching tube group and is used for charging the charging capacitor; the control main module controls the output end of the driving module to output a control signal so as to control the switch-on or switch-off of the switch tube group; when the control signal is high level, the charging capacitor discharges; and when the control signal is low level, the charging capacitor charges.
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Description

technical field

[0001] The invention relates to the technical field of switching circuits, in particular to a switching power supply chip and a switching power supply circuit. Background technique

[0002] As the functions of electronic equipment become more and more complex, the power supply technology has been developed unprecedentedly, the switching speed is getting faster and faster, and the power is getting bigger and bigger. Aiming at a wider range of loads, a new generation of fast charging sources has begun to be gradually introduced to the market, and the requirements for the development indicators of the new generation of fast charging source technology are also gradually increasing, especially in the requirements for a wide output voltage range of the power supply.

[0003] The working voltage of the existing switching power supply itself is provided by the external auxiliary coil winding. The common switching power supply circuit such as the transformer in the fl...

Claims

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