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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

Inactive Publication Date: 2008-08-06
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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 electrical appliances

Method used

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Embodiment Construction

[0010] Please refer to Fig. 1, the preferred embodiment of the overvoltage and undervoltage protection device of the present invention comprises an AC power interface 10, a step-down transformer 20, a rectification filter circuit 30, a first sampling circuit 40, a second sampling circuit 50 . A voltage reference circuit 60 , an upper limit voltage comparator 70 , a lower limit voltage comparator 80 , an OR gate circuit 90 and a protection circuit 100 .

[0011] The AC power interface 10 includes contacts a and b, and the step-down transformer 20 includes a step-down capacitor C 1 and one with the step-down capacitor C 1 The bleeder resistor R connected in parallel 1 . The rectification filter circuit 30 includes a bridge rectifier Z (the bridge rectifier Z can also be replaced by a half-wave rectifier circuit) and a filter capacitor C 2 . The step-down capacitor C 1 Connected between the contact a of the AC power interface 10 and an input terminal A of the bridge rectifie...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/20H02H3/24
Inventor 徐法清唐沛聂俊
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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