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Power supply circuit

A power supply circuit and circuit technology, applied in the direction of adjusting electrical variables, instruments, and converting irreversible AC power input to DC power output, etc., can solve the problems of unstable input power of isolated high-frequency transformers and large stress impact of post-stage circuits, etc. Achieve the effect of reducing stress shock and improving product reliability

Inactive Publication Date: 2009-07-22
INNOCOM TECH (SHENZHEN) CO LTD +1
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems in the prior art that the power supply circuit has a large stress impact on the subsequent circuit and the input power of the isolated high-frequency transformer is unstable, the present invention provides a power supply that has a small stress impact on the subsequent circuit and stabilizes the input power of the isolated high-frequency transformer. circuit

Method used

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Embodiment Construction

[0013] see image 3 , which is a circuit block diagram of the power supply circuit of the liquid crystal display device of the present invention. The power supply circuit 2 includes a bridge rectifier circuit 22, a control circuit 23, an isolated high frequency transformer 24, a rectification filter circuit 25, a negative feedback circuit 26, a buffer circuit 28 and a positive feedback circuit 29, the control circuit 23 includes a switch circuit 231 and a pulse width modulation circuit 232 .

[0014] see Figure 4 ,actually image 3 The specific circuit structure diagram of the power supply circuit shown. Wherein, the control circuit 23 is implemented by an integrated circuit IC805, and the negative feedback circuit 26 is implemented by an optocoupler feedback device IC804. The integrated circuit IC805 has input overvoltage and undervoltage protection functions. The positive feedback circuit 29 includes a first resistor 291, a second resistor 292 and a Zener diode 293, th...

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Abstract

The present invention provides a power supply circuit, which includes a bridge rectifier circuit, a control circuit, an isolated high-frequency transformer, at least one rectification filter circuit and a positive feedback circuit, and the control circuit further includes a switch circuit and a pulse width modulation circuit. The external AC voltage is converted into a DC voltage through the bridge rectifier circuit, and the DC voltage is output through the switch circuit, the isolated high-frequency transformer and the rectification filter circuit, and the positive feedback circuit receives the DC voltage output by the bridge rectifier circuit and feeds back To the pulse width modulation circuit, the pulse width modulation circuit receives the feedback signal to control the conduction time of the switch circuit.

Description

technical field [0001] The invention provides a power supply circuit, in particular to a power supply circuit applied to a liquid crystal display device. Background technique [0002] The power supply circuit of a liquid crystal display device generally adopts a flyback topology, and its AC input wide voltage (from 90V to 240V) design can simultaneously meet the requirements of users with different power supply specifications all over the world. Due to the large voltage span, it is very easy to cause a sudden increase and decrease of the input voltage due to the influence of the change of the power grid, resulting in unstable input power and a large stress impact on the secondary, reducing the safety of the product and the reliability of the device. Due to the instability of its power, it affects the stability of the power grid and does not meet the requirements of green environmental protection. [0003] see figure 1 , which is a circuit module diagram of a power supply c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/133H02M7/02G05F1/46
Inventor 肖华周通
Owner INNOCOM TECH (SHENZHEN) CO LTD
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