CN2924779Y

CN2924779Y - Disconnecting switch with overvoltage-undervoltage protection function

Info

Publication number: CN2924779Y
Application number: CN 200620031591
Authority: CN
Inventors: 李晓航; 李晓洋; 李建
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-04-14
Filing date: 2006-04-14
Publication date: 2007-07-18
Anticipated expiration: 2016-04-14

Abstract

A household breaker switch with the function of over voltage and under voltage protection can accurately detect the power supply voltage and when the voltage is higher or lower than the normal voltage scope, the utility model can generate the control action signal to drive the breaker switch to disconnect the power, so as to cut off the power supply, thereby disconnecting the power of the household electrical devices or electric appliances, further to avoid the economic losses. The switch has sensitive protection actions, safety, reliability and easy installation, which can be interchanged with the used breaker switches in the present markets.

Description

Disconnect with over-and under-voltage defencive function

Affiliated technical field

The utility model relates to the disconnect that a kind of family expenses have overvoltage, under-voltage, electric leakage, short circuit, overcurrent protection function, is fit to the mains switch of registering one's residence of household electricity system.Belong to the low voltage electrical apparatus technology field

Background technology

The employed disconnect of existing market is called " residual current operated protective device ", or the steelyard slepsydra electric switch, also has to claim electric protective device.To the safety utilization of electric power of family, played good protective action.Now be widely used in newly-built residential building.Its main effect is: when got an electric shock when the person (1), leakage switch will be cut off the electricity supply rapidly, guarantees personal safety, and prevented the generation of personnel casualty accidents.(2) when household electrical appliances device fails electric leakage, or during the damaged electric leakage of indoor circuit, leakage switch can be cut off the electricity supply in automatic trip, and home appliance has been played protective effect.But the function that does not possess overvoltage, under-voltage protection.Because people's living standard improves constantly, household electrical appliance become increasingly abundant, and are also more and more higher to the requirement of household electricity quality, but when the undesired fault of voltage appears in electric power system, household electricity device or electrical equipment often taking place damage, cause economic loss, produces the contradiction between power supply department and the user.Household electrical appliance such as air-conditioning, refrigerator, TV, stereo set are in running, if the scope of voltage overrate, breakdown, the discharge of electrical apparatus insulation meeting, make electrical equipment overcurrent or short circuit, very easy generation fire, if voltage is lower than the scope of rated value, then alternating current machine electric current under the nominal load situation can significantly rise, it is overheated that motor occurs, and also can cause electrical equipment to damage.When the utility model can solve electric power system voltage and is higher or lower than the normal voltage scope, the problem that causes household electricity device or electrical equipment to damage.

Summary of the invention

Technical problem underlying of the present utility model is: how to detect supply power voltage accurately, and can produce the control action signal when electric power system voltage is higher or lower than the normal voltage scope, drive disconnect and cut off the power supply immediately.

Circuit is made of three parts: 1) circuit system working power, it is made up of dividing potential drop electric capacity and rectifier diode, voltage-stabiliser tube, provides reliable and stable DC+5V operating voltage to control circuit.2) electric power system voltage sample and logic control circuit are made of voltage sample resistance and voltage comparator, logical circuit.When electric power system voltage is higher or lower than normal voltage, over-voltage comparator or under voltage comparator output high level, logic control circuit produces actuating signal, and actuator drives disconnect and cuts off the power supply immediately.3) major loop disconnect is subjected to logic control circuit to produce actuating signal and controls, and disconnects main circuit when voltage is undesired.

At first determine the numerical value of normal working voltage, the supply voltage V that supposes operate as normal makes VL=V1 when V=170V between 170V-240V, make VL=V2 when V=240V.After system's energized, the value of VL is to change along with mains voltage variations, V1 and V2 are owing to the effect of voltage-stabiliser tube D1 is not along with mains voltage variations changes, and UL compares and produce the corresponding action signal with the u1 of voltage comparator V1 and the u2 of voltage comparator V2 respectively.The output of voltage comparator V1 and voltage comparator V2 all is low level when supply voltage V is between 170V-240V, and relay J is failure to actuate, and main circuit switch continues to connect, and system power supply voltage is normal.As supply voltage V during less than 170V, undervoltage detection circuit detects UL less than u2, the output high level of voltage comparator V2, relay J action, main circuit switch cuts off the power supply immediately, as supply voltage V during greater than 240V, over-voltage detection circuit detects UL greater than u1, the output high level of voltage comparator V1, the relay J action, main circuit switch cuts off the power supply immediately

Use has and has overvoltage, the disconnect of under-voltage protection, can in time cut off the electricity supply when the undesired fault of voltage appears in electric power system, makes household electricity device or appliance cut-off, avoids causing economic loss.Highly stable, reliable through actual test circuit work, little power consumption, the numerical value of overvoltage and under voltage can be adjusted, and the disconnect action is accurately.This disconnect has that volume is little, and protection is active in one's movements, and is safe and reliable, easy for installation, can and the employed disconnect exchange of existing market, the wide popularization and application prospect is arranged.

Description of drawings

Fig. 1 is the connection figure of system, and V1, V2 are respectively overvoltage and under voltage sampling and logic control circuit among the figure, and I1 is electric leakage, excess load or line short protection control circuit, and J1 is the major loop disconnect.

Fig. 2 is overvoltage and under voltage protection circuit theory diagrams.

Fig. 3 is supply power voltage signals collecting and system works power circuit principle figure.

Embodiment

Introduce embodiment of the present utility model below in conjunction with accompanying drawing.

At first determine the numerical value of normal working voltage, the supply voltage V that supposes operate as normal makes VL=V1 when V=170V between 170V-240V, make VL=V2 when V=240V.After system's energized, the value of VL is to change along with mains voltage variations, V1 and V2 are owing to the effect of voltage-stabiliser tube D1 is not along with mains voltage variations changes, and UL compares and produce the corresponding action signal with the u1 of voltage comparator V1 and the u2 of voltage comparator V2 respectively.The output of voltage comparator V1 and voltage comparator V2 all is low level when supply voltage V is between 170V-240V, and relay J is failure to actuate, and main circuit switch continues to connect, and system power supply voltage is normal.As supply voltage V during less than 170V, undervoltage detection circuit detects UL less than u2, the output high level of voltage comparator V2, relay J action, main circuit switch cuts off the power supply immediately, as supply voltage V during greater than 240V, over-voltage detection circuit detects UL greater than u1, the output high level of voltage comparator V1, the relay J action, main circuit switch cuts off the power supply immediately.The normal range (NR) of supply voltage and overvoltage, under-voltage numerical value can be provided with as requested, adjust the value u1 that potentiometer W1 can be provided with overvoltage protection, adjust the value u2 that potentiometer W2 can be provided with under-voltage protection, and the normal range (NR) of supply voltage is less than ul, greater than u2.

Claims

1. disconnect with over-and under-voltage defencive function; the formation that comprises residual current operated protective device and switch; it is characterized in that forming by voltage detecting circuit, logic control circuit, system power supply circuit and main circuit switch control circuit; voltage detecting circuit links to each other with logic control circuit; logic control circuit is connected to control main circuit switch control circuit; the main circuit switch control circuit drives the actuator of disconnect, and the system power supply circuit provides working power to the each several part circuit.