CN201877784U

CN201877784U - Overvoltage and undervoltage protection circuit with self-resetting function

Info

Publication number: CN201877784U
Application number: CN2010206653117U
Authority: CN
Inventors: 李明洁
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-12-17
Filing date: 2010-12-17
Publication date: 2011-06-22
Anticipated expiration: 2020-12-17

Abstract

The utility model relates to an overvoltage and undervoltage protection circuit with a self-resetting function, which comprises a phase voltage collection circuit, a single chip computer control circuit, a voice warning circuit, a driving circuit, a communication circuit and a watchdog circuit, wherein output signals of the phase voltage collection circuit are conveyed to the single chip computer control circuit after being compared by a voltage comparison circuit and an undervoltage comparison circuit and are output to the voice warning circuit, the driving circuit and the communication circuit through being controlled by a single chip computer control circuit, the watchdog circuit makes internal program of the single chip computer control circuit be automatically recovered, the circuit adopts the phase voltage collection circuit and a single chip computer for controlling the reset function, driving signals are given out when the voltage is in an abnormal state, a power cutoff device releases, the power supply is automatically recovered when the voltage is recovered to a normal state, the overvoltage and undervoltage protection circuit is also provided with the communication circuit and the voice warning circuit, the communication circuit is convenient for remote data transmission, and the overvoltage and undervoltage protection circuit is suitable for modern intelligent power distribution system networking.

Description

Band is from resetting over under-voltage protection circuit

Technical field

The utility model relates to a kind of band from resetting over under-voltage protection circuit.

Background technology

Under the single phase power supply situation, because power supply administration's transformer output overvoltage is too high or disconnected zero situation of chamber main line distribution system, to cause the too high or under voltage of phase voltage, finally cause power devices overvoltage/undervoltage fault, household electrical appliance such as refrigerator or air conditioner are under-voltage because of phase voltage, can make compressor can not rotate the back and produce fault or catch fire, and overtension can produce electric equipment and damages, even the breaking out of fire accident.

The utility model content

The purpose of this utility model is to overcome above-mentioned deficiency, provides a kind of band from resetting over under-voltage protection circuit.

The technical scheme that the utility model adopted is such: band is from resetting over under-voltage protection circuit; comprise phase voltage Acquisition Circuit, single chip machine controlling circuit, voice alarm circuit, drive circuit, telecommunication circuit, watchdog circuit; the output signal of described phase voltage Acquisition Circuit through voltage comparator circuit and under voltage comparison circuit relatively after; be transported to single chip machine controlling circuit; by single chip machine controlling circuit control output voice alarm circuit, drive circuit and telecommunication circuit, described watchdog circuit recovers the single chip machine controlling circuit internal processes automatically.

The phase voltage loop that described phase voltage Acquisition Circuit is made of live wire L, zero line N is secondary output to transformer after, connect bridge rectifier again and form, the voltage normal value in the phase voltage loop that described live wire L, zero line N constitute is AC150V-280V.

Described voice alarm circuit is made up of photoelectricity coupling circuit, 9561 speech chips, LM386 audio frequency power amplifier chip and loud speaker.

By adopting the aforementioned techniques scheme, the beneficial effects of the utility model are: this circuit adopts mutually electric Acquisition Circuit, Single-chip Controlling reset function, when voltage is in abnormal condition, send drive signal, allow breaker device thread off, when voltage recovers just often automatic recovery of power supply, and be provided with telecommunication circuit and be convenient to data remote, voice alarm circuit, be suitable for modern intelligent distribution system networking.

Description of drawings

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

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

Embodiment

Further specify the utility model below in conjunction with the drawings and specific embodiments.

As shown in Figure 1 and Figure 2, constitute the phase voltage loop by L, N, when its magnitude of voltage during at the AC220V state, its secondary output AC voltage is about 8V, through the bridge rectifier rectification of diode D1-D4 composition, again after capacitor C 1, C2 filtering, the 2nd, 3 pin that this direct voltage divides two-way to be input to integrated package of pressure-stabilizing IC1 are respectively handled back output 5V power supply supply local circuit and are provided the reference comparison voltages value for the IC2 comparator circuit through the inner voltage stabilizing of integrated package of pressure-stabilizing IC1.Work as L, N constitutes the phase voltage loop, when its magnitude of voltage is higher than AC280V, its secondary output AC voltage is about 11V, after rectification output, by being input to the 6th pin of overvoltage comparison circuit IC2a and the 3rd pin of under voltage comparison circuit IC2b after the adjustable resistance W2 adjustment, the 2nd pin of the 5th pin of overvoltage comparison circuit IC2a and under voltage comparison circuit IC2b carries out voltage ratio, the 6th pin voltage that has served as voltage comparator circuit IC2a is during greater than its 5th pin voltage reference value, overvoltage comparison circuit IC2a interior overturn, be input to the 36th pin of single-chip microcomputer U1 through resistance R 3 current limlitings by its 7th pin output high level, divide three tunnel outputs through the control of single-chip microcomputer U1 internal processes, first via output is from single-chip microcomputer U1 the 38th pin output low level signal, make photoelectricity coupling circuit IC3 conducting, also conducting thereupon of triode VT1 simultaneously, 9561 speech chip IC4, LM386 audio frequency power amplifier chip IC 5 respectively, the audio signal of 9561 speech chip IC4 output is input to LM386 audio frequency power amplifier chip IC 5 the 3rd pin through capacitor C 9 couplings, amplify promotion loud speaker Y by its 6th pin output through capacitor C 10 couplings and send chimes of doom after LM386 audio frequency power amplifier chip IC 5 internal audio frequencies amplify, the voltage failure situation has taken place in expression; The second tunnel output makes triode VT2 conducting by the 8th pin output high level signal of single-chip microcomputer U1 through resistance R 6 current limlitings, the relay J adhesive, and switch J1-1 transfers normal battle to by normally closed point, and breaker device power failure tripping protection power consumption equipment is because of the overtension event; Third Road output is exported through single-chip microcomputer U1 internal processes s operation control, the 1st, 2,3,4 pin of the 27th, 10,11 pin of single-chip microcomputer U1 and 75176 interface chip for driving U3 connect to form the communication data drive circuit, transfer two buses to by the 6th, 7 pin of 75176 interface chip for driving U3 and be connected to PC, send alert data information to PC simultaneously.When the magnitude of voltage that is made of the phase voltage loop L, N returns to 260V when following, its secondary output AC voltage is about 9V, after the bridge rectifier rectification that diode D1-D4 forms, again through capacitor C 1, C2 filtering, the 7th pin of overvoltage comparison circuit IC2a is output as low level, set through single-chip microcomputer U1 internal processes, be judged as normal condition, no signal output.

Work as L, N constitutes the phase voltage loop, when its magnitude of voltage is lower than AC150V, secondary output AC voltage is about 5V, after bridge rectifier rectification output, by being input to the 6th pin of overvoltage comparison circuit IC2a and the 3rd pin of under voltage comparison circuit IC2b after the adjustable resistance W2 adjustment, the 2nd pin of the 5th pin of overvoltage comparison circuit IC2a and under voltage comparison circuit IC2b carries out voltage ratio, when the 2nd pin voltage of under-voltage comparison circuit IC2b during greater than its 3rd pin voltage reference value, under-voltage comparison circuit IC2b interior overturn, be input to the 35th pin of single-chip microcomputer U1 through resistance R 2 current limlitings by its 1st pin output high level, divide three tunnel outputs through the control of single-chip microcomputer U1 internal processes, first via output is from the 38th pin output low level signal of single-chip microcomputer U1, make photoelectricity coupling circuit IC3 conducting, also conducting thereupon of triode VT1 simultaneously, 9561 speech chip IC4, LM386 audio frequency power amplifier chip IC 5 respectively, the 2nd pin output audio signal of 9561 speech chip IC4, be input to the 3rd pin of LM386 audio frequency power amplifier chip IC 5 through capacitor C 9 couplings, amplify promotion loud speaker Y by its 6th pin output through capacitor C 10 couplings and send chimes of doom after LM386 audio frequency power amplifier chip IC 5 internal audio frequencies amplify, the voltage failure situation has taken place in expression.The second tunnel output makes triode VT2 conducting by the 8th pin output high level signal of single-chip microcomputer U1 through resistance R 6 current limlitings, the relay J adhesive, and switch J1-1 transfers normal battle to by normally closed point, and breaker device power failure tripping protection power consumption equipment is because of the overtension fault.Third Road output is exported through single-chip microcomputer U1 internal processes s operation control, the 1st, 2,3,4 pin of the 27th, 10,11 pin of single-chip microcomputer U1 and 75176 interface chip for driving U3 connect to form the communication data drive circuit, transfer two buses to by the 6th, 7 pin of 75176 interface chip for driving U3 and be connected to PC, send alert data information to PC simultaneously.When the magnitude of voltage in the phase voltage loop that is made of L, N returns to 180V when following, its secondary output AC voltage is about 7V, bridge rectifier rectification circuit rectification through diode D1-D4 composition, again after capacitor C 1, C2 filtering, integrated package of pressure-stabilizing IC1DE the 1st pin is output as low level, set through single-chip microcomputer U1 internal processes, be judged as normal condition, no signal output.

The output of the 9th, 16 pin of described single-chip microcomputer IC1 connect 5054 watchdog circuit IC2 the 7th, pin, single-chip microcomputer IC1 internal processes is recovered automatically, prevent that its internal processes is in the endless loop state.

More than show and described basic principle of the present utility model and principal character and advantage thereof; the technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the explanation just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications; these changes and improvements all fall in claimed the utility model scope, and the claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. band is from resetting over under-voltage protection circuit, it is characterized in that: comprise phase voltage Acquisition Circuit (1), single chip machine controlling circuit (2), voice alarm circuit (3), drive circuit (4), telecommunication circuit (5), watchdog circuit (6), after the output signal process voltage comparator circuit (11) of described phase voltage Acquisition Circuit (1) and under voltage comparison circuit (12) compare, be transported to single chip machine controlling circuit (2), by single chip machine controlling circuit (2) control output voice alarm circuit (3), drive circuit (4) and telecommunication circuit (5), described watchdog circuit (6) recovers single chip machine controlling circuit (2) internal processes automatically;

The phase voltage loop that described phase voltage Acquisition Circuit (1) is made of live wire L, zero line N is secondary output to transformer after, connect bridge rectifier again and form, the voltage normal value in the phase voltage loop that described live wire L, zero line N constitute is AC150V-280V.

2. band according to claim 1 is from resetting over under-voltage protection circuit, and it is characterized in that: described voice alarm circuit (3) is made up of photoelectricity coupling circuit, 9561 speech chips, LM386 audio frequency power amplifier chip and loud speaker.