Electric power circuit

A technology of power supply circuit and DC stabilized power supply, which is applied in the direction of electrical components, regulating electrical variables, transformer/inductor coil/winding/connection, etc. Effect

CN101399497BInactive Publication Date: 2011-06-29INNOCOM TECH (SHENZHEN) CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2011-06-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a power supply circuit. The power supply circuit comprises DC regulated power supply, a switching element, a plurality of output branch circuits and at least a bridge resistance. Each output branch circuit comprises a transformer, a rectifying filtrating circuit and an output end which are connected in sequence, the DC regulated power supply provides an DC power supply voltage, the transformer of each output branch circuit transfers the DC power supply voltage to an alternating voltage by the switch element respectively, the corresponding rectifying filtrating circuit outputs the alternating voltage after being rectified and filtrated to the output end respectively, and a plurality of output branch circuits carry out energy support mutually by the bridge resistance.
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Description

technical field

[0001] The invention relates to a power circuit. Background technique

[0002] Power supply circuits are widely used in various consumer electronic products such as liquid crystal displays, liquid crystal televisions, etc., to provide working power for functional circuits inside the electronic products.

[0003] Please refer to FIG. 1 , which is a schematic circuit diagram of a prior art power supply circuit. The power supply circuit 100 includes a DC stabilized power supply 110, a transformer 120, a rectification filter circuit 124, a DC output terminal 125, a feedback circuit 160, a pulse width modulation integrated circuit 170, a switch tube 180, a first load circuit 101 , a second load circuit 102 and a third load circuit 103 .

[0004] The transformer 120 includes a primary coil 121 and a secondary coil 122 . The feedback circuit 160 includes an optocoupler 161 . The PWM IC 170 includes a feedback input 178 and a pulse output 179 . The switch tube 1...

Examples

Embodiment Construction

[0016] Please refer to FIG. 2 , which is a schematic circuit diagram of the first embodiment of the power supply circuit of the present invention. The power supply circuit 200 includes a DC regulated power supply 210, a first output branch 220, a second output branch 230, a third output branch 240, a feedback circuit 260, a pulse width modulation integrated circuit 270, a A switch tube 280 , a first load circuit 201 , a second load circuit 202 and a third load circuit 203 .

[0017] The DC stabilized power supply 210 is a single-phase low-power power supply. The first output branch 220 includes a first transformer 221 , a first rectification filter circuit 224 and a first DC output terminal 225 . The circuit structure of the second output branch 230 is similar to that of the first output branch 220 , and includes a second transformer 231 , a second rectification and filtering circuit 234 and a second DC output 235 . The circuit structure of the third output branch 240 is als...