Power circuit
A technology of power supply circuit and feedback circuit, which is applied in emergency protection circuit devices, electrical components, irreversible AC power input conversion to DC power output, etc. It can solve problems such as changes in overcurrent points and achieve the effect of overvoltage protection
Inactive Publication Date: 2008-07-02
INNOCOM TECH SHENZHEN +1
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Problems solved by technology
[0007] In order to solve the problem that the overcurrent point of the output end of the power supply circuit varies greatly in the prior art, the present invention provides a power supply circuit that stabilizes the overcurrent point of the output end
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[0012] Please refer to FIG. 2 , which is a schematic diagram of the circuit structure of the power supply circuit of the present invention. The power supply circuit 20 includes a first rectification filter circuit 21, a protection circuit 23, an isolated high frequency transformer 24, a second rectification filter circuit 25, a transistor 27, a first feedback circuit 28, a pulse width modulation control 29, a second feedback circuit 31 and a third feedback circuit 35. Wherein, the first rectification and filtering circuit 21 includes two input terminals 211 and 212 , a full bridge rectification circuit 213 , a filter capacitor 214 and an output terminal 215 . The isolated high frequency transformer 24 includes a primary winding 241 , a secondary winding 242 , a first auxiliary winding 30 and a second auxiliary winding 33 . The second rectifying and filtering circuit 25 includes two input terminals 251 , 252 and an output terminal 250 . The PWM controller 29 includes a contro...
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The invention provides a power supply circuit, which comprises a first rectifier-filter circuit, an isolated high-frequency transformer, a second rectifier-filter circuit, a transistor, a first feedback circuit, a second feedback circuit, a third feedback circuit and a pulse-width modulation controller. Under the control of the transistor, the outside alternating voltage outputs the direct voltage through the first rectifier-filter circuit, the isolated high-frequency transformer and the second rectifier-filter circuit. The output voltage of a primary winding is fed back to a voltage sampling terminal of the pulse-width modulation controller through the first feedback circuit, while the induction voltage of a first auxiliary winding of is fed back to the voltage sampling terminal of the pulse-width modulation controller through the second feedback circuit. The induction voltage of a second auxiliary winding is fed back to an overvoltage protective terminal of the pulse-width modulation controller through the third feedback circuit, and the pulse-width modulation controller controls the working state of the power supply circuit according to the feedback signal which is input.
Description
technical field [0001] The invention relates to a power circuit. Background technique [0002] see figure 1 , which is a schematic circuit structure diagram of a prior art power supply circuit. The power supply circuit 10 includes a first rectifying and filtering circuit 11, a protection circuit 13, an isolated high-frequency transformer 14, a second rectifying and filtering circuit 15, a transistor 17, a feedback circuit 18 and a pulse width modulation controller 19 . Wherein, the first rectification filter circuit 11 includes two input ends 111, 112, a full bridge rectification circuit 113, a filter capacitor 114 and an output end 115, and the isolated high frequency transformer 14 includes a primary winding 141 and a secondary winding 142 , the second rectifying and filtering circuit 15 includes two input terminals 151 , 152 and an output terminal 150 , and the pulse width modulation controller 19 includes a control terminal 191 and a voltage sampling terminal 192 . ...
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IPC IPC(8): H02M7/04H02H7/10
Inventor 颜怀柱周通
Owner INNOCOM TECH SHENZHEN