CN202084904U

CN202084904U - Safety controller for water heater

Info

Publication number: CN202084904U
Application number: CN2011201966942U
Authority: CN
Inventors: 傅梨花
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-06-13
Filing date: 2011-06-13
Publication date: 2011-12-21
Anticipated expiration: 2021-06-13

Abstract

The utility model relates to the technical field of electric water heaters, in particular to a safety controller for electric water heaters, which comprises an electric leakage signal collecting and amplifying circuit, a single chip microcomputer control circuit, a display circuit, a power-off driving circuit, a phase-locking circuit and a frequency selective amplifier circuit, wherein an output signal of the electric leakage signal collecting and amplifying circuit is sent to the single chip microcomputer control circuit through an A/D data conversion circuit, a control output of the single chip microcomputer control circuit is connected with the display circuit, the power-off driving circuit and the phase-locking circuit, and an output signal of the phase-locking circuit is transmitted to a carrier signal decoding circuit through the frequency selective amplifier circuit. In case of electric leakage failure of an electric water heater, a single chip microcomputer sends a control signal to drive a power-off device to cut off power and simultaneously drive the a carrier signal to send warning information to a main machine, so as to avoid personnel casualty accidents due to the failure of an electric leakage protector and achieve the purpose of remote safety monitoring and control.

Description

A kind of electric heater safety governor

Technical field

The utility model relates to the electric heater technical field, particularly be a kind of electric heater safety governor.

Background technology

Electric heater has been widely used in huge numbers of families, and in a single day the electric leakage accident appears in electric heater, just will cause personnel casualty accidents.But traditional electric heater only has creepage protection function, if earth leakage protective device is malfunctioning or tripping also can the generation accident.

The utility model content

The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of electric heater safety governor is provided.

The technical scheme that its technical problem that solves the utility model adopts is: a kind of electric heater safety governor, comprise electric leakage signal collection amplifying circuit, single chip machine controlling circuit, display circuit, the outage drive circuit, phase lock circuitry and frequency selective amplifier circuit, the output signal that described electric leakage signal is gathered amplifying circuit through A the D data converting circuit send to single chip machine controlling circuit, single chip machine controlling circuit control output is connected to display circuit, outage drive circuit and phase lock circuitry, the output signal of described phase lock circuitry through the frequency selective amplifier circuit transmission to the carrier signal decoding circuit.

Described electric leakage signal is gathered amplifying circuit by the output of amorphous zero sequence current mutual inductor LN potentiometer R2 in parallel, diode D1, diode D2, capacitor C1 respectively, and the input that is connected to AD623 operational amplifier IC3 by the output of capacitor C1 constitutes again.

Described display circuit adopts the LCD LCD.

Described phase lock circuitry is made of LM567 tone decoder U1 and peripheral electric capacity 2C1, resistance 2R1, resistance 2R2 thereof.

Described frequency selective amplifier circuit is made of elementary L1, electric capacity 2C2, the capacitor 2C3 of triode VT1, audio frequency transformer T, and sends data-signal through power line to the carrier signal decoding circuit by secondary L2, the electric capacity 2C4 of audio frequency transformer T.

Described carrier signal decoding circuit is made of the audio frequency transformer T1, LM567 ATD U2, triode VT2, the LED that connect successively.

By adopting above-mentioned technical scheme; the beneficial effects of the utility model are: when thermoelectric device generation leak current fault; single-chip microcomputer sends control signal and drives breaker device dropout outage; drive carrier signal simultaneously and send warning message to main frame; avoid because of the earth leakage protective device fault causes personnel casualty accidents, reach the purpose of telesecurity monitoring.

Description of drawings

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

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

As Fig. 1, shown in Figure 2, a kind of electric heater safety governor of the present utility model, comprise electric leakage signal collection amplifying circuit 1, single chip machine controlling circuit 3, display circuit 4, outage drive circuit 5, phase lock circuitry 6 and frequency selective amplifier circuit 7, the output signal that described electric leakage signal is gathered amplifying circuit 1 through A D data converting circuit 2 send to single chip machine controlling circuit 3, single chip machine controlling circuit 3 control outputs are connected to display circuit 4, outage drive circuit 5 and phase lock circuitry 6, the output signal of described phase lock circuitry 6 transfers to carrier signal decoding circuit 8 through frequency selective amplifier circuit 7.

Described electric leakage signal is gathered the output difference in parallel potentiometer R2 of amplifying circuit 1 by amorphous zero sequence current mutual inductor LN, diode D1, diode D2, capacitor C1, the input that is connected to AD623 operational amplifier IC3 by the output of capacitor C1 constitutes again, phase line and zero line should pass amorphous zero sequence current mutual inductor LN simultaneously and gather the residual current signal, when the water heater phase line has the earth leakage fault, the magnetic flux of amorphous zero sequence current mutual inductor LN and no longer wait zero, it produces small induced voltage signal, this signal is through resistance R 1 current limliting, potentiometer R2 dividing potential drop, adjust potentiometer R2 and can change signal input current size, through diode D1, the D2 amplitude limit, be input to the 3rd pin of AD623 operational amplifier IC3, after the inner amplification of AD623 operational amplifier IC3, change potentiometer R3 scalable multiplication factor, the 6th pin output signal of AD623 operational amplifier IC3 is after diode D3 is rectified into d. c. voltage signal, again through resistance R 4 current limlitings, resistance R 5 dividing potential drops, capacitor C 2 filtering output linear voltage is input to the 2nd pin input of A D data transaction chip IC 4 again, after the A/D conversion, signal is input to the 22nd of single-chip microcomputer IC1,23,24 pin, through single-chip microcomputer IC1 read A after the data of D data transaction chip IC 4, handle above set point time-divisions three tunnel output by single-chip microcomputer IC1 internal processes, first via output is by the 8th pin output high level signal of single-chip microcomputer IC1, through resistance R 9 current limlitings, make triode Q1 conducting, the relay J adhesive, its contact J-1 also transfers normally closed point to, promote contactor KM adhesive, make the breaker device outage, cut off water heater power supply, support personnel's safety; The second tunnel output is formed display circuit 4 by the 1st, 2,38,39 pin of single-chip microcomputer IC1 and the 3rd, 4,5,6 pin of LCD LCD IC2, by single-chip microcomputer IC1 read A the signal of D data transaction chip IC 4 data transaction, after single-chip microcomputer IC1 internal logic is judged, send control signal driving LCD LCD IC2 and show current leakage current value; Third Road is formed phase lock circuitry 6 by LM567 tone decoder U1 and peripheral electric capacity 2C1, resistance 2R1 thereof, the multivibrator that resistance 2R2 constitutes, its frequency of oscillation is by the parameter decision of electric capacity 2C1, resistance 2R1, and carrier frequency is adjusted in the 150-300KHZ scope.Elementary L1, electric capacity 2C2, capacitor 2C3 by triode VT1, audio frequency transformer T constitute frequency selective amplifier circuit 7, the 6th pin output high level signal by single-chip microcomputer IC1, make LM567 tone decoder U1 obtain working power, LM567 tone decoder U1 starts working, be coupled on local telephone network speaking wire or the AC network AC220V power line and send by secondary L2, the electric capacity 2C4 of audio frequency transformer T, send data-signal to the carrier wave main frame.

Described carrier signal decoding circuit 8 is by the audio frequency transformer T1 that connects successively, LM567 ATD U2, triode VT2, LED constitutes, resistance 1R1, the time constant of electric capacity 1C5 network has determined the voltage controlled oscillator of LM567 ATD U2, when the carrier wave extension set when main frame sends 150-300KHZ carrier wave command signal, through electric capacity 1C1, audio frequency transformer T1 is coupled to the secondary L3 of audio frequency transformer T, its secondary L3, electric capacity 1C2, electric capacity 1C3 forms a carrier wave frequency-selective network, signal after the frequency-selecting is coupled to the 3rd pin signal input part of LM567 ATD U2 through electric capacity 1C4, after LM567 ATD U2 decoding, by its 8th pin output output low level, make triode VT2 conducting, LED is lighted, the carrier data signal of receiving extension set is described, leak current fault appears in the expression water heater, should in time get rid of, reach the telesecurity monitoring.

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

Claims

1. electric heater safety governor, it is characterized in that: comprise electric leakage signal collection amplifying circuit (1), single chip machine controlling circuit (3), display circuit (4), outage drive circuit (5), phase lock circuitry (6) and frequency selective amplifier circuit (7), the output signal that described electric leakage signal is gathered amplifying circuit (1) through A D data converting circuit (2) send to single chip machine controlling circuit (3), single chip machine controlling circuit (3) control output is connected to display circuit (4), outage drive circuit (5) and phase lock circuitry (6), the output signal of described phase lock circuitry (6) transfers to carrier signal decoding circuit (8) through frequency selective amplifier circuit (7).

2. a kind of electric heater safety governor according to claim 1, it is characterized in that: described electric leakage signal is gathered amplifying circuit (1) by the output of amorphous zero sequence current mutual inductor LN potentiometer R2 in parallel, diode D1, diode D2, capacitor C1 respectively, and the input that is connected to AD623 operational amplifier IC3 by the output of capacitor C1 constitutes again.

3. a kind of electric heater safety governor according to claim 1 is characterized in that: described display circuit (4) adopts the LCD LCD.

4. a kind of electric heater safety governor according to claim 1 is characterized in that: described phase lock circuitry (6) is made of LM567 tone decoder U1 and peripheral electric capacity 2C1, resistance 2R1, resistance 2R2 thereof.

5. a kind of electric heater safety governor according to claim 1, it is characterized in that: described frequency selective amplifier circuit (7) is made of elementary L1, electric capacity 2C2, the capacitor 2C3 of triode VT1, audio frequency transformer T, and sends data-signal through power line to carrier signal decoding circuit (8) by secondary L2, the electric capacity 2C4 of audio frequency transformer T.

6. a kind of according to claim 1 or 5 electric heater safety governor is characterized in that: described carrier signal decoding circuit (8) is made of the audio frequency transformer T1, LM567 ATD U2, triode VT2, the LED that connect successively.