A switching power supply and its constant voltage output controller
A switching power supply and constant voltage output technology, which is applied in the control/regulation system, output power conversion device, DC power input conversion to DC power output, etc., can solve the problems of high cost, poor system stability and reliability, and complex circuit structure and other problems, to achieve the effect of solving poor system stability and reliability, reducing costs, and simplifying circuit structure
Active Publication Date: 2016-01-27
SHENZHEN SUNMOON MICROELECTRONICS
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[0004] The purpose of the present invention is to provide a constant voltage output controller of a switching power supply, which aims to solve the problems of poor system stability and reliability, complex circuit structure and high cost in the prior art
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[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0018] The embodiment of the present invention simplifies the circuit structure of the switching power supply by adopting a constant voltage output controller including a startup module, a voltage comparison module, a reference voltage generation module, a power switch, a voltage sampling amplification module, and a pulse width modulation module in the switching power supply. The cost is reduced, and at the same time, the output voltage of the output stage load driving circuit can be cyclically modulated stably and reliably to achieve a constant voltage output to the load.
[0019] figure 1 The...
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The invention is suitable for the field of switching power supplies and provides a switching power supply and a constant voltage output controller thereof. The constant voltage output controller consisting of a starting module, a voltage comparison module, a reference voltage generating module, a power switch, a voltage sampling amplifying module and a pulse width modulation module is adopted in the switching power supply, so that the circuit structure of the switching power supply is simplified; the cost is reduced; simultaneously, the output voltage of an output-stage load drive circuit is subjected to stable and reliable periodic modulation, so that the constant voltage output of a load can be realized; and the problems of poor system stability, poor reliability, complicated circuit structure and high cost in the prior art are solved.
Description
Technical field [0001] The invention belongs to the field of switching power supplies, and particularly relates to a switching power supply and a constant voltage output controller thereof. Background technique [0002] At present, with the continuous development and update 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 small household appliances (such as rice cookers, soymilk machines and induction cookers), switching power supplies generally only need to have a constant voltage output function. [0003] In order to achieve constant voltage output in small household appliances, the prior art provides a BUCK-BOOST (buck-boost) switching power supply system. Its internal controller detects the feedback voltage of the output stage and responds to The voltage change adjusts the internal switching frequency in a timely manner to achieve ...
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IPC IPC(8): H02M1/36H02M3/156
Inventor 林道明李照华赵春波谢靖付凌云郭伟峰
Owner SHENZHEN SUNMOON MICROELECTRONICS