Switching power supply and multi-threshold switching circuit thereof
A switching circuit and switching power supply technology, applied in the direction of electrical components, adjusting electrical variables, instruments, etc., can solve the problems of high cost, complex circuit structure, poor stability and reliability, etc.
Active Publication Date: 2013-02-06
SHENZHEN SUNMOON MICROELECTRONICS
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[0004] The purpose of the present invention is to provide a multi-threshold switching circuit for a switching power supply, which aims to solve the problems of poor stability and reliability of the switching power supply system, complex circuit structure and high cost in the prior art
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[0013] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0014] In the embodiment of the present invention, a multi-threshold switching circuit including a sampling voltage judging module, a voltage-controlled oscillation module, a reference voltage generating module, and a power switch is used in the switching power supply. The sampling voltage judging module divides the voltage output by the sampling and power supply circuit 300 and compare it with the first reference voltage, the second reference voltage and the third reference voltage output by the reference voltage generation module, and output corresponding control signals to the voltage-controlled ...
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The invention is applicable to the technical field of switching power supplies, and provides a switching power supply and a multi-threshold switching circuit thereof. The multi-threshold switching circuit is characterized in that a sampling voltage judgment module is used for dividing voltage outputted by a power supply circuit, comparing the voltage with a first reference voltage, a second reference voltage and a third reference voltage outputted by a reference voltage generating module and outputting corresponding control signals to a voltage-controlled oscillation module according to comparison results; the voltage-controlled oscillation module is used for generating pulse signals with specific duty ratio according to a fourth reference voltage and a fifth reference voltage which are outputted by the reference voltage generating module and the control signals; and a power switch is used for high-frequency on-off switching with a corresponding frequency according to the pulse signals to enable a transformer to perform storage and release of electricity energy correspondingly, so that output voltage of the transformer is periodically modulated to achieve stable contact voltage output. The switching power supply is further simplified structurally by the aid of the multi-threshold switching circuit, and cost is reduced.
Description
technical field [0001] The invention belongs to the technical field of switching power supplies, and in particular relates to a switching power supply and a multi-threshold switching circuit thereof. Background technique [0002] At present, with the continuous development and updating of switching power supply technology, switching power supply has the advantages of high efficiency, small size and low cost, so it has been widely used in various electronic devices. Especially in power supplies such as mobile phone chargers or adapters or standby power supplies, switching power supplies generally only need to have a constant voltage output function. [0003] In order to achieve constant voltage output in power supplies such as mobile phone chargers or adapters, the existing technology provides a primary-side feedback flyback switching power supply, which needs to sample the conduction current of the switch tube, and through the independent internal controller After the pin s...
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IPC IPC(8): H02M7/217H02M3/335
Inventor 赵春波李照华林道明谢靖付凌云胡乔
Owner SHENZHEN SUNMOON MICROELECTRONICS