Switch power supply with constant voltage/constant current output and control method thereof

A switching power supply, constant current output technology, applied in conversion equipment without intermediate conversion to AC, emergency power supply arrangements, electrical components, etc., can solve the problems of high requirements for operational amplifier design parameters, increased cost, and increased circuit design difficulty. , to achieve the effect of reducing design difficulty and cost, reducing power loss and reducing cost
CN101867289AActive Publication Date: 2010-10-20SILERGY SEMICON TECH (HANGZHOU) CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SILERGY SEMICON TECH (HANGZHOU) CO LTD
Publication Date
2010-10-20

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Abstract

The invention relates to a switch power supply with constant voltage / constant current output and a control method thereof. The switch power supply comprises a PWM control circuit and a power switching device, a first feedback circuit and a second feedback circuit, wherein the first feedback circuit is used for detecting a secondary inductive circuit and generating a first error amplification signal representing the output current information of the switching power supply circuit; and the second feedback circuit is used for detecting an output voltage and generating a second error amplification signal representing the output voltage information of the switching power supply circuit. When the switching power supply is in a first load condition, a switchover control circuit outputs a first control signal to the PWM control circuit, and the switching power supply outputs a constant voltage; when the switching power supply is in a second load condition, the switchover control circuit outputs a second control signal to the PWM control circuit, and the switching power supply outputs constant current.
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Description

technical field

[0001] The invention relates to a switching power supply circuit, which belongs to the technical field of power supplies, in particular to a switching power supply with constant voltage and constant current output. Background technique

[0002] With the development of switching power supply technology, switching power supplies are widely used in various occasions such as communications and computers. When using a switching power supply as a power supply for a USB interface, a notebook computer, or other current-limiting ports, it is usually required that the switching power supply can provide a constant voltage output under normal load, and when the output is overloaded such as a short circuit and other abnormal conditions, it is required. The switching power supply can provide constant current output to avoid damage to the USB interface and other devices.

[0003] In the prior art, an operational amplifier with constant current modulation is usually added o...

Claims

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