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Power circuit

A technology of power supply circuit, rectification filter circuit, applied in emergency protection circuit devices, electrical components, adjusting electrical variables, etc.

Inactive Publication Date: 2010-04-14
INNOCOM TECH (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem of high cost of the power supply circuit in the prior art, it is necessary to provide a low-cost power supply circuit

Method used

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Embodiment Construction

[0013] see figure 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 pulse width modulation controller 23, an isolation high frequency transformer 24, a second rectification filter circuit 25, a field effect transistor 27, an overvoltage protection circuit 29, A first resistor 221 , a second resistor 222 and an output terminal 250 . 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 PWM controller 23 includes a control terminal 231 and an undervoltage protection terminal 232 . The isolated high frequency transformer 24 includes a primary winding 241 , a secondary winding 242 and an auxiliary winding 243 . The overvoltage protection circuit 29 includes a resistor R1, a bipolar transistor 29...

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Abstract

The invention provides a power supply circuit, which comprises a first rectifier-filter circuit, a pulse-width modulation controller, an isolated high-frequency transformer, a second rectifier-filtercircuit, a transistor and an overvoltage protective circuit; wherein, the isolated high-frequency transformer comprises an auxiliary winding and the pulse-width modulation controller comprises an undervoltage protective end. 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. When the output voltage exceeds the maximum output voltage allowed by the transistor, the inductive voltage of the auxiliary winding is feedback to the undervoltage protective end through the overvoltage protective circuit and the pulse-width modulation controller is stopped from working.

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, an isolated high-frequency transformer 14, a second rectifying and filtering circuit 15, a transistor 17, an optocoupler 18, a first resistor 121, a second resistor 122, An overvoltage protection circuit 16 and a pulse width modulation controller 19 . Wherein, the first rectification and filtering circuit 11 includes two input terminals 111 and 112 , a full bridge rectification circuit 113 , a filter capacitor 114 and an output terminal 115 . 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 . The overvoltage protection circuit 16 incl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M3/335H02H7/122
Inventor 周洪波乐昆周通
Owner INNOCOM TECH (SHENZHEN) CO LTD
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