Over voltage and under-voltage device

An under-voltage protection and over-voltage technology, applied in the protection of over-voltage response, under-voltage or no-voltage protection, etc., can solve problems such as unstable power supply voltage, burnt electrical appliances, and electrical appliances work abnormally. , to achieve the effect of prolonging the service life
CN101237137AInactive Publication Date: 2008-08-06HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
Publication Date
2008-08-06
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to an overvoltage and undervoltage protecting device which comprises an alternating current power interface, a voltage reduction transformer, a rectification filter circuit, a first sample circuit, a second sample circuit, a voltage reference circuit, an upper-limit voltage comparator, a lower-limit voltage comparator, an or circuit and a protection circuit; the alternating current power interface is connected to two ends of power equipment; a first junction of the alternating current power interface is connected with an input terminal of the rectification filter circuit through the voltage reduction transformer; the other input terminal of the rectification filter circuit is connected with a second junction of the alternating current power interface; when an input voltage accessing to the alternating current power interface excesses a normal scope, an output terminal of the voltage reference circuit is in short connected with the second junction of the alternating current power interface by the protection circuit in order that an overcurrent protector connected between an alternating current input and the power equipment trips off to cut off the connection between the alternating current input and the power equipment. The overvoltage and undervoltage protecting device of the invention can carry out overvoltage and undervoltage protection to the power equipment, effectively protect the equipment and prolong the life-span of the power equipment.
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Description

technical field

[0001] The invention relates to a protection device, in particular to an overvoltage and undervoltage protection device. Background technique

[0002] At present, due to power shortage, the power supply voltage is very unstable. It may only be about 160 volts (undervoltage) during the peak power consumption, and it will exceed 250 volts (overvoltage) in the middle of the night. The unstable voltage will cause abnormal operation of electrical appliances and serious will burn out the appliance. In order to ensure the performance and life of household appliances, it is particularly important to protect household appliances from overvoltage and undervoltage.

[0003] At the same time, some areas or companies have multiple types of voltage (110 volts or 220 volts) requirements. In order to prevent voltage from being used incorrectly, it is also necessary to install overvoltage and undervoltage protection devices at the voltage input terminals of the equipment. ...

Claims

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