CN103779831A - Self-recovery over-voltage and under-voltage protection device based on single-chip microcomputer - Google Patents

Self-recovery over-voltage and under-voltage protection device based on single-chip microcomputer Download PDF

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CN103779831A
CN103779831A CN201410046164.8A CN201410046164A CN103779831A CN 103779831 A CN103779831 A CN 103779831A CN 201410046164 A CN201410046164 A CN 201410046164A CN 103779831 A CN103779831 A CN 103779831A
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voltage
circuit
phase
chip microcomputer
latching relay
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CN201410046164.8A
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CN103779831B (en
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杨新宇
李军杰
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Xi'an A Pu Dun Electricity Technology Co ltd
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Abstract

The invention relates to a self-recovery over-voltage and under-voltage protection device based on a single-chip microcomputer. The number of existing over-voltage and under-voltage protection products special for three-phase voltage protection is very small, and complete synchronization of system functions can not be achieved because step-down transformers are adopted to complete voltage detection. The protection device is composed of a power circuit, a voltage detection sampling circuit, a single-chip microcomputer control circuit and a magnetic latching relay drive circuit. The input end of the power circuit is a three-phase inlet terminal, and the output terminals of the power circuit are the single-chip microcomputer control circuit and the magnetic latching relay drive circuit. The inlet terminal of the voltage detection sampling circuit is a three-phase inlet terminal, and the output terminal of the voltage detection sampling circuit is the single-chip microcomputer control circuit; the output terminal of the single-chip microcomputer control circuit is the magnetic latching relay drive circuit, and a voltage signal is received by the single-chip microcomputer control circuit, converted and judged and is then output to the magnetic latching relay drive circuit through delay control. The self-recovery over-voltage and under-voltage protection device is small in size, long in service life, good in uniformity, capable of precisely adjusting voltage protection parameters and reliable in protection.

Description

SCM Based three-phase self-resetting type over voltage protector
Technical field
the present invention relates to a kind of over voltage protective device of power supply, be specifically related to a kind of SCM Based three-phase self-resetting type over voltage protector.
Background technology
Within 2008, rise in " design of civil buildings standard " JGJ16-2008 of execution and stipulate, " end of incoming cables of Residential distribution box should install short circuit, overload and cross, under-voltage protector ".At present the commercially available individual event Self-recover overvoltage-undervoltage protector that is mostly, is applicable to the uses such as home dwelling, but there is equally even higher requirement in other larger Tenements to Electrical Safety as hotel, villa etc., and individual event protector can not meet.On market the existing overvoltage for three-phase electricity, undervoltage protection system be all with three independently single-phase simple concatenation form; in fact this usage is owing to itself constructing the limitation of design; can not realize synchronously, so can not play a protective role in reality is used.
Summary of the invention
The object of this invention is to provide a kind of SCM Based three-phase self-resetting type over voltage protector that is applicable to large-scale property, power consumption is lower, more reliable, longer service life.
The technical solution adopted in the present invention is:
SCM Based three-phase self-resetting type over voltage protector, is characterized in that:
Described protector is made up of power circuit, voltage detecting sample circuit, single chip machine controlling circuit and drive circuit of magnetic latching relay;
The input of described power circuit is three-phase electricity end of incoming cables, and output is single chip machine controlling circuit and drive circuit of magnetic latching relay;
The input of described voltage detecting sample circuit is three-phase electricity end of incoming cables, and output is single chip machine controlling circuit;
The output of described single chip machine controlling circuit is drive circuit of magnetic latching relay;
The voltage signal that single chip machine controlling circuit receiver voltage detects sample circuit to be provided is changed judgement, then exports drive circuit of magnetic latching relay to through time delay control, sampling voltage over voltage situation is judged.
In described power circuit, three-phase phase voltage A, B, the input of C Fen San road, phase voltage A, N are through piezo-resistance RV1 in parallel, after filter C1 filtering, the first via is through resistance R 1 dividing potential drop, by filter C2 filtering again, give diode D1, D2 and electric capacity E1 and carry out the flat ripple of halfwave rectifier, produce DC power supply, then send into voltage stabilizing circuit chip TL7812 through resistance R 9 and R2, triode Q5, resistance R 3 and diode D4, by its output 12V DC power supply; Power supply chip TL7805 formation+5V power supply is delivered on the second road;
B, C two-phase are mutually identical with A.
Described voltage detecting sample circuit gathers A, B, C three-phase electricity, for single-chip microcomputer provides voltage signal; A mutually electricity completes halfwave rectifier through diode D3, through resistance R 14, electric capacity E2 filtering step-down, by adjustable resistance W1 Gather and input signal, sends into single chip machine controlling circuit through electric capacity E3 filtering;
B, C two-phase are mutually identical with A.
Described single chip machine controlling circuit comprises single-chip microcomputer U2, capacitor C 7, voltage-stabiliser tube Z1, Z2, Z3;
Provide+5V of power circuit power supply provides power supply for single-chip microcomputer U2, and between its both positive and negative polarity, shunt-wound capacitance C7 completes filtering; Voltage-stabiliser tube Z1-Z3 for sampling input voltage signal abnormal protection is provided, its voltage stabilizing value is+5.1V that collection signal value is generally 1.5~3V, once input is abnormal, when be greater than+5.1V of signal value, voltage-stabiliser tube punctures input voltage value is clamped on to voltage stabilizing value, protection single-chip microcomputer;
A, B, the C three-phase voltage signal of the collection of voltage detecting sample circuit are sent into single-chip microcomputer U2, after inner A/D conversion, become digital signal, relatively produce over voltage and default phase signal with set point, be respectively used to drive light-emitting diode L1-L4 to show protector state; Meanwhile, the signal output order of generation exports drive circuit of magnetic latching relay to, is switched on or switched off protected main circuit according to detection limit size.
Described drive circuit of magnetic latching relay comprises magnetic latching relay K3, triode Q1-Q4 and resistance R 6, R7, R10, R11, R19, R20, R21 and R22;
Resistance R 7, R10, R19, R20 and Q1, Q3 form one group of power amplification circuit, when single-chip microcomputer U2 output order, its high level signal extremely forms loop through resistance R 10, triode Q3, make triode Q3 conducting, thereby make+12V power supply through triode Q1, resistance R 20, triode Q3 extremely, makes triode Q1 conducting, + 12V power supply adds to magnetic latching relay K3 coil through triode Q1, drive magnetic latching relay K3 work, its main contacts closure, connects three phase mains main circuit;
While there is over voltage fault in power supply; single-chip microcomputer U2 output order is through the power amplification circuit of resistance R 11, R6, triode Q2, Q4, resistance R 21, R22 composition; send into reverse impulse driving signal to 1,2 ends of magnetic latching relay K3; make its state reversion; main contacts disconnects, protection main circuit.
The present invention has the following advantages:
The over voltage protection system the present invention relates to has advantages of that power consumption is little, reliable operation, long service life, high conformity; And main control unit adopts Single-chip Controlling, can realize comparative voltage and arrange arbitrarily.
Accompanying drawing explanation
Fig. 1 is power circuit diagram (A phase).
Fig. 2 is voltage detecting sample circuit figure (A phase).
Fig. 3 is single chip machine controlling circuit figure.
Fig. 4 is drive circuit of magnetic latching relay.
The SCM Based three-phase self-resetting type of Fig. 5 over voltage protector software flow pattern.
Embodiment
Below in conjunction with embodiment, the present invention will be described in detail.
The SCM Based three-phase self-resetting type of one involved in the present invention over voltage protector, formed by power circuit, voltage detecting sample circuit, single chip machine controlling circuit and drive circuit of magnetic latching relay, the input of power circuit is three-phase electricity end of incoming cables, and output is single chip machine controlling circuit and drive circuit of magnetic latching relay; The input of voltage detecting sample circuit is three-phase electricity end of incoming cables, and output is single chip machine controlling circuit; The output of single chip machine controlling circuit is drive circuit of magnetic latching relay.The voltage signal that single chip machine controlling circuit receiver voltage detects sample circuit to be provided is changed judgement, then exports drive circuit of magnetic latching relay to through time delay control, sampling voltage over voltage situation is judged.When protector work, power circuit input three-phase voltage produces the required DC power supply of system through integrated stable voltage circuit; Voltage detecting sample circuit gathers A, B, C three-phase electricity, for single-chip microcomputer provides voltage signal; The voltage signal that Single-chip Controlling element circuit completes detecting judges processing through inner A/D conversion; Three-phase magnetic latching relay is accepted single-chip microcomputer output control command, by drive circuit drive actions, completes the protection to main power source.
The present invention has following structure function feature: (1) adopts special integrated stable voltage circuit voltage stabilizing, and the working power of system single-chip microcomputer and magnetic latching relay is provided; (2) Chip Microcomputer A/D converter sampling input signal and reference signal circuit, in order to input three-phase voltage and the reference voltage of sampling respectively; (3) single-chip microcomputer is to input and reference signal sampling, automatic decision overvoltage, under-voltage; (4) single-chip microcomputer and drive circuit output over voltage signal, produce the energy that drives magnetic latching relay; (5) dedicated magnetic latching relay, as actuator, is finally controlled the break-make of three phase mains.
Referring to Fig. 1, in power circuit, the input of three-phase phase voltage A, B, C Fen San road, phase voltage A, N be through piezo-resistance RV1 in parallel, then after filter C1 filtering, the first via is through resistance R 1 dividing potential drop, by filter C2 filtering, give diode D1, D2 and electric capacity E1 and carry out the flat ripple of halfwave rectifier, produce DC power supply, then send into voltage stabilizing circuit chip TL7812 through resistance R 9 and R2, triode Q5, resistance R 3 and diode D4, by its output 12V DC power supply; Power supply chip TL7805 formation+5V power supply is delivered on the second road.B, C two-phase are mutually identical with A.
Referring to Fig. 2, voltage detecting sample circuit gathers A, B, C three-phase electricity, for single-chip microcomputer provides voltage signal; A mutually electricity completes halfwave rectifier through diode D3, through resistance R 14, electric capacity E2 filtering step-down, by adjustable resistance W1 Gather and input signal, sends into single chip machine controlling circuit through electric capacity E3 filtering.B, C two-phase are mutually identical with A.
Referring to Fig. 3, single chip machine controlling circuit comprises single-chip microcomputer U2, capacitor C 7, voltage-stabiliser tube Z1, Z2, Z3.Provide+5V of power circuit power supply provides power supply for single-chip microcomputer U2, and between its both positive and negative polarity, shunt-wound capacitance C7 completes filtering; Voltage-stabiliser tube Z1-Z3 for sampling input voltage signal abnormal protection is provided, its voltage stabilizing value is+5.1V that collection signal value is generally 1.5~3V; once input is abnormal; when be greater than+5.1V of signal value, voltage-stabiliser tube punctures input voltage value is clamped on to voltage stabilizing value, protection single-chip microcomputer.A, B, the C three-phase voltage signal of the collection of voltage detecting sample circuit are sent into single-chip microcomputer U2, after inner A/D conversion, become digital signal, relatively produce over voltage and default phase signal with set point, be respectively used to drive light-emitting diode L1-L4 to show protector state; Meanwhile, the signal output order of generation exports drive circuit of magnetic latching relay to, is switched on or switched off protected main circuit according to detection limit size.
Referring to Fig. 4, drive circuit of magnetic latching relay comprises magnetic latching relay K3, triode Q1-Q4 and resistance R 6, R7, R10, R11, R19, R20, R21 and R22.Resistance R 7, R10, R19, R20 and Q1, Q3 form one group of power amplification circuit, when single-chip microcomputer U2 output order, its high level signal extremely forms loop through resistance R 10, triode Q3, make triode Q3 conducting, thereby make+12V power supply through triode Q1, resistance R 20, triode Q3 extremely, makes triode Q1 conducting, + 12V power supply adds to magnetic latching relay K3 coil through triode Q1, drive magnetic latching relay K3 work, its main contacts closure, connects three phase mains main circuit.While there is over voltage fault in power supply; single-chip microcomputer U2 output order is through the power amplification circuit of resistance R 11, R6, triode Q2, Q4, resistance R 21, R22 composition; send into reverse impulse driving signal to 1,2 ends of magnetic latching relay K3; make its state reversion; main contacts disconnects, protection main circuit.
Voltage detecting sample circuit is power supply signal input single-chip microcomputer U2, and single-chip microcomputer U2 detects in real time to line voltage, in the time detecting that voltage is within normal range (NR), sends pulse adhesive instruction by single-chip microcomputer U2 to drive circuit of magnetic latching relay.Drive circuit of magnetic latching relay drives the pull-in winding of magnetic latching relay, completes combined floodgate, powering load.If because of electric network source fault cause overtension or too low exceed setting after, start time delay, after delay arrival time, send the instruction of pulse separating brake by single-chip microcomputer U2, drive magnetic latching relay switching winding through drive circuit of magnetic latching relay again, complete separating brake, stop powering to the load.After cut-out powers to the load, single-chip microcomputer U2 is real-time detection of grid voltage still, in the time that line voltage returns to normal value, single-chip microcomputer U2 starts runback time delay, to prevent that voltage from recovering suddenly, and power supply de-stabilising effect user power utilization when power supply, after delay arrival time, send pulse adhesive instruction by single-chip microcomputer U2 to drive circuit of magnetic latching relay, complete the combined floodgate that automatically resets, recover powering load.Such time delay design, had both guaranteed power supply continuity, also can protect the safety utilization of electric power of power consumption equipment.
It is cited that content of the present invention is not limited to embodiment, and the conversion of any equivalence that those of ordinary skills take technical solution of the present invention by reading specification of the present invention, is claim of the present invention and contains.

Claims (5)

1. SCM Based three-phase self-resetting type over voltage protector, is characterized in that:
Described protector is made up of power circuit, voltage detecting sample circuit, single chip machine controlling circuit and drive circuit of magnetic latching relay;
The input of described power circuit is three-phase electricity end of incoming cables, and output is single chip machine controlling circuit and drive circuit of magnetic latching relay;
The input of described voltage detecting sample circuit is three-phase electricity end of incoming cables, and output is single chip machine controlling circuit;
The output of described single chip machine controlling circuit is drive circuit of magnetic latching relay;
The voltage signal that single chip machine controlling circuit receiver voltage detects sample circuit to be provided is changed judgement, then exports drive circuit of magnetic latching relay to through time delay control, sampling voltage over voltage situation is judged.
2. SCM Based three-phase self-resetting type over voltage protector according to claim 1, is characterized in that:
In described power circuit, three-phase phase voltage A, B, the input of C Fen San road, phase voltage A, N are through piezo-resistance RV1 in parallel, after filter C1 filtering, the first via is through resistance R 1 dividing potential drop, by filter C2 filtering again, give diode D1, D2 and electric capacity E1 and carry out the flat ripple of halfwave rectifier, produce DC power supply, then send into voltage stabilizing circuit chip TL7812 through resistance R 9 and R2, triode Q5, resistance R 3 and diode D4, by its output 12V DC power supply; Power supply chip TL7805 formation+5V power supply is delivered on the second road;
B, C two-phase are mutually identical with A.
3. SCM Based three-phase self-resetting type over voltage protector according to claim 2, is characterized in that:
Described voltage detecting sample circuit gathers A, B, C three-phase electricity, for single-chip microcomputer provides voltage signal; A mutually electricity completes halfwave rectifier through diode D3, through resistance R 14, electric capacity E2 filtering step-down, by adjustable resistance W1 Gather and input signal, sends into single chip machine controlling circuit through electric capacity E3 filtering;
B, C two-phase are mutually identical with A.
4. SCM Based three-phase self-resetting type over voltage protector according to claim 3, is characterized in that:
Described single chip machine controlling circuit comprises single-chip microcomputer U2, capacitor C 7, voltage-stabiliser tube Z1, Z2, Z3;
Provide+5V of power circuit power supply provides power supply for single-chip microcomputer U2, and between its both positive and negative polarity, shunt-wound capacitance C7 completes filtering; Voltage-stabiliser tube Z1-Z3 for sampling input voltage signal abnormal protection is provided, its voltage stabilizing value is+5.1V that collection signal value is generally 1.5~3V, once input is abnormal, when be greater than+5.1V of signal value, voltage-stabiliser tube punctures input voltage value is clamped on to voltage stabilizing value, protection single-chip microcomputer;
A, B, the C three-phase voltage signal of the collection of voltage detecting sample circuit are sent into single-chip microcomputer U2, after inner A/D conversion, become digital signal, relatively produce over voltage and default phase signal with set point, be respectively used to drive light-emitting diode L1-L4 to show protector state; Meanwhile, the signal output order of generation exports drive circuit of magnetic latching relay to, is switched on or switched off protected main circuit according to detection limit size.
5. SCM Based three-phase self-resetting type over voltage protector according to claim 4, is characterized in that:
Described drive circuit of magnetic latching relay comprises magnetic latching relay K3, triode Q1-Q4 and resistance R 6, R7, R10, R11, R19, R20, R21 and R22;
Resistance R 7, R10, R19, R20 and Q1, Q3 form one group of power amplification circuit, when single-chip microcomputer U2 output order, its high level signal extremely forms loop through resistance R 10, triode Q3, make triode Q3 conducting, thereby make+12V power supply through triode Q1, resistance R 20, triode Q3 extremely, makes triode Q1 conducting, + 12V power supply adds to magnetic latching relay K3 coil through triode Q1, drive magnetic latching relay K3 work, its main contacts closure, connects three phase mains main circuit;
While there is over voltage fault in power supply; single-chip microcomputer U2 output order is through the power amplification circuit of resistance R 11, R6, triode Q2, Q4, resistance R 21, R22 composition; send into reverse impulse driving signal to 1,2 ends of magnetic latching relay K3; make its state reversion; main contacts disconnects, protection main circuit.
CN201410046164.8A 2014-02-10 2014-02-10 SCM Based three-phase self-resetting type over voltage protector Active CN103779831B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106026013A (en) * 2016-05-19 2016-10-12 安徽信邦塑业有限公司 Protection circuit for storage battery charger
CN112821345A (en) * 2021-01-25 2021-05-18 上海电器科学研究所(集团)有限公司 Control device and control method for voltage fault protection

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106026013A (en) * 2016-05-19 2016-10-12 安徽信邦塑业有限公司 Protection circuit for storage battery charger
CN112821345A (en) * 2021-01-25 2021-05-18 上海电器科学研究所(集团)有限公司 Control device and control method for voltage fault protection

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