Highly integrated switching power supply and control circuit
A technology for control circuits and switching power supplies, applied in control/regulating systems, electrical components, regulating electrical variables, etc., can solve problems such as exceeding output specifications, high system costs, and low device reliability, achieving high reliability and simplifying the system. , the effect of low cost
Active Publication Date: 2020-09-08
WUXI CHIPOWN MICROELECTRONICS
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Problems solved by technology
Wherein the output voltage feedback signal of the FB pin is obtained by dividing the voltage of the first feedback resistor R11 and the second resistor R12, and the primary current signal of the CS pin is obtained by the primary current sampling resistor R13; the primary current sampling resistor R3, If there is an open circuit or a short circuit in the voltage feedback upper resistor R11 and the second feedback resistor R12, the control circuit 100 cannot obtain accurate output voltage signals or transformer primary current information, and the output constant voltage function cannot be realized, even because the second feedback resistor Abnormal short circuit or open circuit of R12, abnormal output voltage feedback signal will lead to high or low output voltage, exceeding the output specification, thus damaging the load
[0004] The traditional switching power supply system, the peripheral design is complex, the system cost is high, and the reliability of the components is low
Method used
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[0029] refer to figure 2 , figure 2 It is a schematic structural diagram of a switching power supply system provided by an embodiment of the present invention.
[0030] figure 2 The shown switching power supply system includes: a transformer T21, an input circuit and an output circuit. The input circuit is coupled to the primary winding Np and the secondary winding Na of the transformer T21, and the output circuit is coupled to the secondary winding Ns of the transformer T21. The output circuit includes an output capacitor EC21, an output diode D23 and a dummy load resistor R26.
[0031] The input circuit includes: a first feedback resistor R21, the first end of which is coupled to the secondary winding, and the second end is coupled to the feedback pin (FB pin) of the control circuit; a power supply capacitor EC21 is suitable for supplying the control circuit providing electric energy; and a control circuit 200 adapted to sample the primary current on the primary windi...
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A highly integrated switching power supply and control circuit, the power switching system includes a transformer, the transformer includes a primary winding, a secondary winding and an auxiliary winding, the control circuit includes: the control circuit includes: a power switch tube , adapted to control the on-off of the primary winding of the transformer; a sampling tube, connected in parallel with the power switch tube, adapted to generate a current sampling signal, the current sampling signal is proportional to the primary current; and a current detection module, It is suitable for detecting the current sampling signal and outputting a sampling voltage, and the sampling voltage is positively correlated with the current sampling signal.
Description
technical field [0001] The invention relates to the field of electronic circuits, in particular to a highly integrated switching power supply and control circuit. Background technique [0002] figure 1 A schematic diagram of a simplified structure of a traditional switching power supply system is shown, which mainly includes: a transformer T11, an input circuit and an output circuit. The input circuit is coupled to the primary winding Np and the secondary winding Na of the transformer T11, and the output circuit is coupled to the secondary winding Ns of the transformer T11. Wherein, the input circuit includes: a power supply diode D12, a filter capacitor C1, a power supply capacitor EC11, a voltage feedback upper resistor R11, a voltage feedback lower resistor R12, a primary side current sampling resistor R13, a starting resistor R14 and a control circuit 100. The control The circuit 100 is integrated in a chip and includes a plurality of pins. The output circuit includes...
Claims
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IPC IPC(8): H02M3/335
CPCH02M3/33523H02M1/0009H02M1/36H02M3/156H02M3/33507
Inventor 赵倡申李海松刘文亮秦浩易扬波王旷
Owner WUXI CHIPOWN MICROELECTRONICS