Constant voltage output switching power supply device with high power factor and control method thereof

A high power factor, switching power supply technology, applied in output power conversion devices, conversion of AC power input to DC power output, high-efficiency power electronic conversion, etc., can solve the problem of high cost, complex circuit structure, and poor system stability and reliability. etc., to achieve the effect of high power factor

CN106341038AInactive Publication Date: 2017-01-18WUXI SIRISE MICROELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-01-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a constant voltage output switching power supply with a high power factor, which is composed of a rectifying and filtering circuit, a power converter, a control circuit, an output voltage feedback circuit, an inductive current zero-crossing feedback circuit and a chip power supply circuit. The constant voltage output switching power supply is characterized in that alternating current is inputted and converted into direct current through the rectifying and filtering circuit, the direct current is inputted into the power converter, the direct current is outputted to a load circuit from the power converter, then detection is carried out on a main power circuit through the output voltage feedback circuit, the inductive current zero-crossing feedback circuit and the chip power supply circuit, an acquired result is inputted into the control circuit so as to enable the control circuit to operate and obtain a control scheme, and output of the control circuit is transmitted to the power converter so as to perform control on the power converter. According to the constant voltage output power supply system with a high power factor, the turn-on time of a power switch tube is controlled to be constant through design of the control circuit and the feedback circuit; constant voltage output can be achieved in a full voltage range, and a high power factor can be ensured.
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Description

technical field

[0001] The invention relates to the technical field of switching power supplies, in particular to a constant voltage output power supply device and a control circuit thereof.

[0002] technical background

[0003] There are certain requirements for the power factor of the switching power supply connected to the AC grid, because if the power factor is not enough, it will cause a certain degree of pollution to the grid. The IEC International Electrotechnical Commission has put forward clear harmonic requirements for lighting fixtures, namely the IEC61000-3-2 standard. Judging from the actual application situation, the requirements for power factor are mostly higher than the standard regulations.

[0004] The closest prior art of the present invention: publication number: CN102290997A, publication date: 2011-12-21, name: a constant voltage output control circuit and a switching power supply of a switching power supply controller, providing a constant voltage out...

Examples

Embodiment Construction

[0031] The present invention will be described in further detail below according to accompanying drawing and embodiment:

[0032] like figure 1 As shown, a high power factor constant voltage output switching power supply of the present invention includes a rectification filter circuit, a power converter, an output voltage feedback circuit, an inductor current zero-crossing feedback circuit, a chip power supply circuit and a control circuit.

[0033] The rectification and filtering circuit includes a rectification bridge and an input filter capacitor, which are used to rectify and filter the AC input voltage, and the voltage after rectification and filtering is a half-sine wave.

[0034] The power converter is used to transform the AC voltage into a DC constant voltage output voltage, and realize the power factor correction function at the same time.

[0035] The output voltage feedback circuit is used to sample the output voltage as the voltage feedback signal of the control ...