CN202817697U

CN202817697U - Electrical protection system

Info

Publication number: CN202817697U
Application number: CN 201220434061
Authority: CN
Inventors: 吴桂林; 黄永福
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-08-29
Filing date: 2012-08-29
Publication date: 2013-03-20
Anticipated expiration: 2022-08-29

Abstract

The utility model relates to an electrical protection system, comprising an AC voltage sampling circuit, a current acquisition circuit and a one-chip microcomputer control circuit. The output signal of the AC voltage sampling circuit is transmitted to the one-chip microcomputer control circuit through a trigger circuit; the output signal of the current acquisition circuit is transmitted to the one-chip microcomputer control circuit through a comparator circuit; and the output signal of the one-chip microcomputer control circuit is controlled to be sent to a driving output circuit. When overvoltage or under-voltage happens to the AC voltage, the power supply is automatically cut off through the electrical protection system, power supply is automatically recovered when the voltage is recovered, faults such as overcurrent, short-circuit, overvoltage and under-voltage protection functions are possessed, and the electrical protection system is advantageous in that the functions are complete, cost is low, the reliability is strong, etc.

Description

A kind of electrical protection systems

Technical field

The utility model relates to a kind of protection system, particularly be a kind of electrical protection systems.

Background technology

The generation of electrical fire, most because the faults such as supply line's overcurrent, short circuit, over voltage cause, according to the interrelated data statistics, electrical fire accounts for more than 30% of fire generation, and traditional electrical fire protective device, defencive function is more single.

The utility model content

The purpose of this utility model is to provide a kind of error protection electrical protection systems such as overcurrent, short circuit, over voltage that have.

The technical scheme that its technical problem that solves the utility model adopts is: a kind of electrical protection systems; comprise alternating current voltage sampling circuit, current collection circuit and single chip machine controlling circuit; the output signal of described alternating current voltage sampling circuit transfers to single chip machine controlling circuit through circuits for triggering; the output signal of described current collection circuit transfers to single chip machine controlling circuit through comparator circuit, and the output signal control of described single chip machine controlling circuit is sent to the driver output circuit.

Preferably, described circuits for triggering adopt the rest-set flip-flop that is made of time-base integrated circuit IC1.

Preferably, to capacitor C 7 capacitor chargings, its output signal re-sends to current rectifying and wave filtering circuit and consists of the voltage signal that described current collection circuit is produced by current transformer L1 through R9.

Preferably, described comparator circuit adopts LM324 comparator IC4.

Preferably, described single chip machine controlling circuit adopts 2051 single-chip microcomputer IC2.

By adopting above-mentioned technical scheme; the beneficial effects of the utility model are: in the situation of alternating voltage overvoltage or under-voltage, overcurrent; the utility model automatic cut-off power; until automatic recovery of power supply when recovering normal; have the failure protection functions such as overcurrent, short circuit, over voltage, but also have the advantages such as multiple functional, that cost is low, reliability is strong.

Description of drawings

Fig. 1 is frame assumption diagram of the present utility model;

Fig. 2 is electricity of the present utility model. the road schematic diagram.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

As shown in Figure 1 and Figure 2; a kind of electrical protection systems of the present utility model; comprise alternating current voltage sampling circuit 1, current collection circuit 2 and single chip machine controlling circuit 3; the output signal of described alternating current voltage sampling circuit 1 transfers to single chip machine controlling circuit 3 through circuits for triggering 11; the output signal of described current collection circuit 2 transfers to single chip machine controlling circuit 3 through comparator circuit 21, and the output signal control of described single chip machine controlling circuit 3 is sent to driver output circuit 31.

Described circuits for triggering 11 adopt the rest-set flip-flop that is made of time-base integrated circuit IC1, and civil power is after diode VD1 rectification, capacitor C 2 step-downs, voltage stabilizing didoe DW voltage stabilizing in the circuit, and output dc voltage is for this device provides working power.Time-base integrated circuit IC1 has been connected into the triggering mode of operation of a RS, because voltage stabilizing didoe VD2 place in circuit, so that the reference voltage clamp voltage of time-base integrated circuit IC1 internal comparator is approximately about 4V, the 2nd pin trigger end of the sampling value that transfinites control time-base integrated circuit IC1, the 4th pin preset end of under-voltage sampling value voltage control time-base integrated circuit IC1, if the sampling value on the 2nd pin of time-base integrated circuit IC1 is lower than 2V, and the resetting voltage value of the sampling value voltage ratio 0.7V on its 4th pin is high, time-base integrated circuit IC1 just resets so, subsequently, the 3rd pin output high level of time-base integrated circuit IC1, this signal is input to the 19th pin I/O end of 2051 single-chip microcomputer IC2 through resistance R 6 current limlitings, after 2051 single-chip microcomputer IC2 internal processes are judged, be judged as normal condition, do not send the driving signal.

If supply power voltage transfinites when 265V or under-voltage 155V; time-base integrated circuit IC1 resets; level on the 3rd pin of time-base integrated circuit IC1 will change into low level from high level; this signal is input to the 19th pin I/O end of 2051 single-chip microcomputer IC2 through resistance R 6 current limlitings; judge internal delay time after 5 seconds through 2051 single-chip microcomputer IC2 internal processes, by the 11st pin output low level triggering signal of 2051 single-chip microcomputer IC2, make the controllable silicon SCR cut-off; thereby the cut-out load power source, the safety of protection electric equipment.

The voltage signal that described current collection circuit 2 is produced by current transformer L1 through R9 to capacitor C 7 capacitor chargings, its output signal re-sends to current rectifying and wave filtering circuit and consists of, when live wire passes current transformer L1, phase line has electric current to pass through, the ac voltage signal that the phase line current is responded to according to the current transformer L1 of load electric power is along with size of current changes and changes.When overcurrent or short circuit; refer generally to In1.05-In10 times above rated current; so when having electric current to pass through current transformer L1; the secondary of current transformer L1 can produce voltage signal; resistance R 9 is to capacitor C 7 capacitor chargings; by diode VD3 rectification; by by capacitor C 8; C9; C10; the ∏ type filter integral circuit that resistance R 11 forms; resistance by transformation resistance R13 can change the time of discharging and recharging; be input to the 6th pin of LM324 comparator IC4; by resistance R 12; the composition setting voltage values such as R14 are added to the 5th pin of LM324 comparator IC4; the 5th of LM324 comparator IC4; 6; 7 pin form a voltage comparator circuit; when the 6th pin voltage of LM324 comparator IC4 during greater than its 5th pin voltage; the upset of LM324 comparator IC4 internal comparator circuit; the 7th pin of LM324 comparator IC4 uprises level by low level; directly be added to the 1st pin of photoelectrical coupler IC3; the inner optocoupler circuit turn-on of photoelectrical coupler IC3; the 3rd pin of photoelectrical coupler IC3 becomes low level by original high level; this signal is input to the 14th pin I/O end of 2051 single-chip microcomputer IC2; judge internal delay time or the instantaneous control signal of sending through 2051 single-chip microcomputer IC2 internal processes; the 11st pin output low level triggering signal by 2051 single-chip microcomputer IC2; make the controllable silicon SCR cut-off; thereby the cut-out load power source, the safety of protection electric equipment.

Above-described only is a preferred embodiment of the present utility model, can not limit the scope that the utility model is implemented, and every equalization of doing according to the utility model claim changes and decorates, and all should still belong in the scope that the utility model contains.

Claims

1. electrical protection systems; it is characterized in that: comprise alternating current voltage sampling circuit (1), current collection circuit (2) and single chip machine controlling circuit (3); the output signal of described alternating current voltage sampling circuit (1) transfers to single chip machine controlling circuit (3) through circuits for triggering (11); the output signal of described current collection circuit (2) transfers to single chip machine controlling circuit (3) through comparator circuit (21), and the output signal control of described single chip machine controlling circuit (3) is sent to driver output circuit (31).

2. electrical protection systems according to claim 1 is characterized in that: the rest-set flip-flop that described circuits for triggering (11) employing is made of time-base integrated circuit IC1.

3. electrical protection systems according to claim 1 is characterized in that: to capacitor C 7 capacitor chargings, its output signal re-sends to current rectifying and wave filtering circuit and consists of the voltage signal that described current collection circuit (2) is produced by current transformer L1 through R9.

4. it is characterized in that according to claim 1 or 3 described electrical protection systems: described comparator circuit (21) adopts LM324 comparator IC4.

5. electrical protection systems according to claim 1 is characterized in that: described single chip machine controlling circuit (3) employing 2051 single-chip microcomputer IC2.