Under-voltage protection circuit

An undervoltage protection and circuit technology, applied in the field of power supply protection circuit, can solve the problem that the hysteresis of the power supply controller cannot meet the actual application requirements, and achieve the effect of accelerating the power supply shutdown speed, low cost, and simple and reliable circuit

Active Publication Date: 2009-07-01
SHENZHEN TCL NEW-TECH CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0007] The technical scheme of the present invention has low cost, simple and reliable circuit, solves the problem that the hysteresis of the p

Method used

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[0010] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0011] Please refer to figure 1 versus figure 2 In the technical solution of the present invention, sampling is performed at the output terminal VA point of the bridge rectifier unit (D, C1). When the grid voltage VC changes, the sampling voltage VA also changes. The comparison result of the sampling voltage VA and the startup threshold voltage V-on and the shutdown threshold voltage V-off of the power controller is used to control the shutdown or restart of the power controller. .

[0012] The power supply undervoltage protection circuit of the present invention is a resistance sampling volt...

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Abstract

The invention provides an under-voltage protection circuit used for protecting a power supply of an electric appliance when an external input voltage is too low. The electric appliance comprises a filter network, a bridge rectifier unit, an active power factor correction boost module, and a power supply controller. The under-voltage protection circuit is characterized in that the circuit is connected between an output terminal of the bridge rectifier unit and an input terminal of the power supply controller; and when the output voltage of the under-voltage protection circuit is lower than the turn-off threshold voltage of the power supply controller, the power supply controller stops working, and the power supply of the electric appliance is cut off. The technical proposal has lower cost and simple and reliable circuit, solves the problem that the hysteresis amount of the power supply controller in the prior art can not meet the demands in practical application, and improves the turn-off speed of the power supply.

Description

technical field [0001] The invention relates to a power supply protection circuit, in particular to an undervoltage protection circuit of a household appliance. Background technique [0002] At present, due to the unstable voltage of the power supply grid in some areas, the fluctuation is relatively large. Therefore, when the grid voltage exceeds a certain range (usually the voltage is too low, that is, undervoltage), it is necessary to stop the power supply of household appliances, such as televisions, to protect the power supply. Generally, a power controller is set inside the household appliance, and the voltage obtained by sampling is compared with a preset reference voltage of the power controller. If the sampling voltage is lower than the shutdown threshold voltage of the power controller, the power controller is controlled to stop working, and the power supply is cut off for power protection; if the sampling voltage is higher than the startup threshold voltage of the...

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Application Information

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IPC IPC(8): H02H3/24
Inventor 李锦乐周迎锋
Owner SHENZHEN TCL NEW-TECH CO LTD
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