Quasi resonant flyback power supply and high voltage starting circuit thereof
A high-voltage startup, quasi-resonant technology, applied in the direction of high-efficiency power electronic conversion, electrical components, output power conversion devices, etc., can solve the overall efficiency of the power module, the high-voltage startup circuit cannot be turned off, and the startup resistor consumes power. Achieve the effect of improving efficiency, reducing power loss and reducing energy loss
Inactive Publication Date: 2014-05-14
XJ ELECTRIC +1
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Problems solved by technology
[0004] The purpose of the present invention is to provide a general-purpose quasi-resonant flyback high-voltage start-up circuit, which is used to solve the problem that the existing high-voltage start-up circuit cannot be shut down after start-up, resulting in continuous power consumption by the start-up resistor, resulting in a decrease in the overall efficiency of the power supply module
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[0015] The present invention will be further described below in conjunction with the accompanying drawings.
[0016] figure 1 It is a high-voltage starting circuit diagram of the present invention, including a bidirectional TVS tube, a quasi-resonant controller and a charging capacitor, one end of the bidirectional TVS tube is connected to the input DC bus, and the other end is connected to the high-voltage starting terminal HV of the quasi-resonant controller; one end of the charging capacitor Connect the power input terminal VCC of the quasi-resonant controller and the auxiliary winding of the flyback transformer, and the other end is grounded. When the charging capacitor reaches the startup voltage of the quasi-resonant control chip, the quasi-resonant control chip starts to work, and the quasi-resonant control chip starts to work. After the detection circuit makes the quasi-resonant flyback power supply start to work, the constant current source is turned off, and the bidi...
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The invention relates to a quasi resonant flyback power supply and a high voltage starting circuit thereof. The high voltage starting circuit of the quasi resonant flyback power supply comprises a bidirectional TVS tube, a quasi resonant controller and a charging capacitor. According to the quasi resonant flyback power supply and the high voltage starting circuit thereof of the invention, current is started through constant high voltage so as to charge the charging capacitor of the quasi resonant controller, such that quick start of the quasi resonant controller can be realized; and the constant high voltage-started current can be cut off effectively after the start of the quasi resonant controller is realized, and therefore, the efficiency of the quasi resonant flyback power supply can be improved, and energy loss of a quasi resonant flyback power supply system when the quasi resonant flyback power supply is in a standby state can be decreased.
Description
technical field [0001] The invention relates to the field of power starting, in particular to a high-voltage starting circuit of a quasi-resonant flyback power supply. Background technique [0002] In the current continuous innovation of global electronic products, low-power power supplies have reached about 70% of the global power supplies, and most of them are designed with flyback topology. The low efficiency of flyback power supplies has become a fatal difficulty in designing small power supplies. The quasi-resonant flyback power supply can effectively improve the efficiency, and the continuous innovation of the power supply during the quasi-resonant flyback also presents a restriction on the startup circuit under high voltage conditions. For example, the rectified voltage of the three AC inputs at the input terminal of the charger is already higher than 500V. The most indispensable thing in every charger is the auxiliary power supply. Therefore, the high-voltage start-u...
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IPC IPC(8): H02M1/36
CPCY02B70/10
Inventor 张滨常志国曹亚张向炜孔德原王涵袁顺刚郭浩王锐王宁
Owner XJ ELECTRIC