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Flyback switch circuit of switch frequency hopping

A switching circuit and switching frequency technology, applied in the electronic field, can solve the problems of low efficiency and achieve the effect of improving efficiency

Inactive Publication Date: 2013-05-01
青岛联盟电子仪器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention proposes a flyback switch circuit with switching frequency hopping, which solves the problem of low efficiency of the existing flyback switch circuit under light load conditions

Method used

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  • Flyback switch circuit of switch frequency hopping
  • Flyback switch circuit of switch frequency hopping
  • Flyback switch circuit of switch frequency hopping

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Embodiment Construction

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0017] Such as figure 2 As shown, the flyback switching circuit 100 with switching frequency hopping of the present invention includes: an input port 101 for receiving an input voltage Vin; an output port 102 for providing an output voltage Vo; a rectification unit 103 coupled to the input port 101 for receiving an input voltage Vin, to generate a rectified voltage; a transformer, including a primary winding 104-1 and a secondary winding 104-2, wherein the pr...

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Abstract

The invention provides a flyback switch circuit of switch frequency hopping, solving the problem that the flyback switch circuit is low in efficiency under a light load state. The flyback switch circuit comprises an input port, an output port, a rectification unit, a primary side power switch, an auxiliary side diode, an output capacitor, a feedback component, an auxiliary side connecting resistor, a primary side connecting resistor, a Zener diode, a voltage comparator, a selection switch, a frequency comparator, a sawtooth wave generator and a control and drive circuit. With the adoption of the flyback switch circuit, the efficiency of the flyback switch circuit is improved under the light load state.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a flyback switching circuit with switching frequency hopping. Background technique [0002] The flyback switching circuit is also known as a single-ended flyback or buck-boost converter, and its output voltage can be higher or lower than the voltage of the power supply. A typical flyback switching circuit such as figure 1 As shown, the flyback switching circuit includes: an input port receiving the input voltage Vin; an output port providing the output voltage Vo; a rectifier unit Rec coupled to the input port to receive the input voltage Vin; a transformer including the primary winding T1 and the secondary A side winding T2, the primary winding T1 is coupled to the rectifier unit Rec; a primary power switch S is coupled between the primary winding T1 and the primary reference ground; a secondary diode D is coupled between the secondary winding T2 and Between the output por...

Claims

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Application Information

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IPC IPC(8): H02M3/335
Inventor 王玲
Owner 青岛联盟电子仪器有限公司
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