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Power supply circuit and LCD device using the same

A technology of liquid crystal display device and power supply circuit, which is applied in the direction of output power conversion device, electrical components, adjusting electrical variables, etc., can solve the problems of low power utilization rate of power supply circuit and the like

Inactive Publication Date: 2008-10-08
INNOCOM TECH SHENZHEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the problem of low power utilization rate of the prior art power supply circuit, it is necessary to provide a power supply circuit with high power utilization rate

Method used

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  • Power supply circuit and LCD device using the same
  • Power supply circuit and LCD device using the same
  • Power supply circuit and LCD device using the same

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Experimental program
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Embodiment Construction

[0019] see figure 2 , which is a schematic diagram of the circuit structure of the first embodiment of the power supply circuit of the present invention. The power circuit 200 includes two DC input terminals 201 , 202 , a full bridge circuit 210 , a transformer 220 , an output circuit 230 and an output terminal 240 .

[0020] The full bridge circuit 210 includes four first field effect transistors 211 , second field effect transistors 212 , third field effect transistors 213 and fourth field effect transistors 214 connected in the form of a full bridge. The transformer 220 includes a primary winding 221 and a secondary winding 222 .

[0021] The two input terminals of the full bridge circuit 210 are the two DC power supply input terminals 201 and 202, the first field effect transistor 211, the second field effect transistor 212, the third field effect transistor 213 and the fourth field effect transistor 214 are all Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFET...

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Abstract

A power supply circuit comprises two AC input ends, a transformer, an output circuit and an output end, the transformer comprises a primary winding and a secondary winding, the output circuit comprises a first inductance, a second inductance, a first diode, a second diode and a filter capacitor, the two AC input ends are respectively connected to the two ends of the primary winding, the one end of the secondary winding is connected in series to the first inductance, then is connected to the output end, the other end is connected in series to the second inductance, then is connected to the output end, the first diode positive pole is connected to one end of the secondary winding, the negtive pole is connected to the ground, the second diode positive pole is connected to the other end of the secondary winding, the negtive pole is connected to the ground, the filter capacitor is connected between the output end and the ground. The power supply circuit has advantage of high electric energy utilance. The invention also provides a LCD device using the power supply circuit.

Description

technical field [0001] The invention relates to a power supply circuit and a liquid crystal display device using the power supply circuit. Background technique [0002] Power supply circuits are widely used in circuits of various electrical appliances to provide working power for different circuits. [0003] see figure 1 , which is a schematic circuit structure diagram of a prior art power supply circuit. The power circuit 100 includes two DC input terminals 101 , 102 , a full bridge circuit 110 , a transformer 120 , an output circuit 130 and an output terminal 140 . [0004] The full bridge circuit 110 includes four first field effect transistors 111, second field effect transistors 112, third field effect transistors 113 and fourth field effect transistors 114 connected in the form of a full bridge. The gates of the four field effect transistors The on and off are controlled by the control signal respectively. The transformer 120 includes a primary winding 121 and a se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28H02M3/335H02M1/14G09G3/36
Inventor 鲁建辉
Owner INNOCOM TECH SHENZHEN
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