Self-powered circuit for switching power supply, control chip, switching power supply and electrical device
A switching power supply and self-powered technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problems of large drop in feedback power supply voltage and affect the normal operation of the control circuit, etc., and achieve the effect of simple structure
Pending Publication Date: 2019-04-16
上海芯飞半导体技术有限公司
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to provide a kind of Self-powered circuit for powering switching power supply controller at light load or no-load, and control chip, switching power supply and electrical device including the self-powered circuit
Method used
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[0036] figure 2 It is the circuit principle diagram of the self-power supply circuit used in the switching power supply of the present invention. In various embodiments of the present invention, when the switching power supply is light-loaded or no-loaded, the main switch (that is, the switch part K) is configured as figure 2 connection shown.
[0037] Such as figure 2 As shown, the input circuit 1 is electrically connected (coupled) to the output circuit 2 through the converter 3 .
[0038] The first end of the switch component K is used to connect the primary coil of the switching power supply converter 3, and the second end is grounded through the energy storage capacitor C; the energy storage capacitor C supplies power for the control circuit 4 and the charge pump 5; the control circuit 4 is in a predetermined voltage range According to the level of the voltage Vcc of the energy storage capacitor C, the corresponding control signal V0 is output to the charge pump 5 t...
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The present invention relates to a self-powered circuit for a switching power supply, a control chip, the switching power supply and an electrical device. The self-powered circuit comprises a switching component, an energy storage capacitor, a control circuit and a charge pump. A first end of the switch component is used for connecting a primary coil of a switching power converter, and a second end is grounded through the energy storage capacitor. The energy storage capacitor is used for supplying power to the control circuit and the charge pump. The control circuit outputs a corresponding control signal to the charge pump to control the operation of the charge pump according to the magnitude of the voltage of the energy storage capacitor in a predetermined voltage range. The charge pump outputs a switching signal to a control end of the switching component according to the control signal of the control circuit so as to control the turn-on and turn-off of the switching component. By implementing the invention, when the switching power supply has a light load or empty load, the voltage of the energy storage capacitor is controlled within a predetermined voltage range, the energy storage capacitor provides normal working power supply for a controller or the control chip of the switching power supply such that the controller or the control chip of the switching power supply can work normally.
Description
technical field [0001] The invention relates to the field of switching power supplies, in particular to a self-power supply circuit of a switching power supply controller under light load or no load, a control chip including the self-power supply circuit, a switching power supply, and an electrical device powered by the switching power supply. Background technique [0002] Commonly used switching power converter circuits such as figure 1 As shown, the control circuit controls the switching on and off of the switching converter to achieve the energy conversion output of the switching converter. The control circuit itself also consumes energy, so it must supply power to the control circuit. The common way is to provide energy for the control circuit by the feedback circuit provided by the switching converter, but the output power supply voltage of this power supply circuit will vary with the output load. The feedback power supply voltage is high when it is loaded. When it is ...
Claims
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IPC IPC(8): H02M1/00
CPCH02M1/00H02M1/0006
Inventor 胡小波
Owner 上海芯飞半导体技术有限公司