CN109687390A - Tracking mode electronics fireproofing controller and its control method - Google Patents
Tracking mode electronics fireproofing controller and its control method Download PDFInfo
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- CN109687390A CN109687390A CN201910105665.1A CN201910105665A CN109687390A CN 109687390 A CN109687390 A CN 109687390A CN 201910105665 A CN201910105665 A CN 201910105665A CN 109687390 A CN109687390 A CN 109687390A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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Abstract
The present invention relates to a kind of tracking mode electronics fireproofing controller and its control methods, the control method is to connect rectifier bridge on an ac power supply line for constituting ac circuit, the output termination switching tube and load current sample resistance of rectifier bridge, to constitute the DC control circuit for carrying out on-off control to the ac circuit, the control electrode of switching tube connects signal control circuit, when load current sample resistance detects load current and is abnormal, signal control circuit issues cut-off signals, turn off switching tube, disconnect DC control circuit, rectifier bridge disconnects ac power supply line therewith, and swift electron self-lock switch then passes through self-locking function and switching tube is made to keep lasting off state, the load in ac circuit is set to remain powered off state, it is achieved in load and the short circuit of power supply line, overload and virtual connection protection.The Electrical Safety protection that present invention can be suitably applied to various places, can replace the control cabinet of various lathes, electrical equipment etc., can also be directly as inbeing safe explosion prevention product.
Description
Technical field
The present invention relates to a kind of safety devices against fire, specifically a kind of tracking mode electronics fireproofing controller and its control
Method.
Background technique
Electrical appliance is frequently resulted in the generation of electrical fire, is thus drawn due to factors such as route virtual connection, overload, short circuit sparkings
The fire disaster accident of hair, is often reported in media, and leads to the heavy losses of people's lives and properties.There are three types of the generations of electrical fire
Reason: first is that short-circuit fire, second is that virtual connection spark is (being commonly called as giving a tongue-lashing fire) on fire, third is that local fault or partial short-circuit generate high temperature and
It is on fire.In order to avoid the generation of fire incident, electrical appliance polygamy is a variety of auxiliary for overcurrent relay, the time relay, contactor etc.
Help appliance device.And these ancillary apparatus device types are various, applicable situation is different, and crucial is a little also to and electrical appliance
High current startup power matches, so the setting of protection value of risk is generally higher than normal operating value, is otherwise difficult to start, also very
Difficulty plays due protective effect.
Route virtual connection is a kind of common factors for causing electrical fire, and process is precisely due to connection is bad, internal resistance
Increase leads to instantaneous open circuit and fracture gap very little of opening a way, thus easily generates gap discharge, and the repetition of discharge process hair
It is raw, it is formed continuous pulse spark, causes fire incident.
Summary of the invention
It is an object of the invention to provide a kind of tracking mode electronics fireproofing controller and its control methods, to solve existing electricity
Gas control cabinet is because of the problem of electrical fire Frequent Accidents caused by protection device configuration is uncomfortable or missing.
The present invention is implemented as follows: a kind of tracking mode electronics fireproofing controller, comprising:
Virtual connection detection protection circuit, connects respectively with protective switch of the short circuit circuit and signal control circuit, for monitoring electrical appliance
Or the open circuit signaling of power supply line, when being judged as that virtual connection happens just to protective switch of the short circuit circuit and signal control circuit
Issue virtual connection power-off signal；
Overload detection control circuit connects respectively with protective switch of the short circuit circuit and signal control circuit, for monitoring electrical appliance
Overcurrent or partial short-circuit situation, when be judged as overload situations occur when just to protective switch of the short circuit circuit and signal control circuit
Issue overload power-off signal；
Protective switch of the short circuit circuit detects protection circuit, overload detection control circuit, signal control circuit and electricity with virtual connection respectively
Source circuit connects, for passing through swift electron self-lock switch when short circuit, virtual connection or overload situations occur for electrical appliance, power supply line
Circuit interrupting power circuit；
Starting current tracking adjustmenting circuit, connects with signal control circuit, for tracking the starting current of electrical appliance, and with opening
The variation of streaming current makes corresponding adjustment to protection value；
Signal control circuit detects protection circuit, overload detection control circuit, protective switch of the short circuit circuit respectively and is opened with virtual connection
Streaming current tracking adjustmenting circuit connects, and indicates for the immediate status to electrical appliance and power supply line；And
Power circuit provides working volts alternating current for load, and provides direct-current working volts for each part mentioned above circuit.
The circuit composition of the power circuit is that ac input end connects ac output end through protector BX1, is inputted in exchange
It is connected in parallel to capacitor C1 and varistor Ry1 between two connecting terminals at end, from two connecting terminals of ac input end
Upper lead connects the original side of transformer B1, divides two-way after the losing side of transformer B1 rectified bridge ZQ2 and filter capacitor C2, connects all the way
The input terminal of voltage-stablizer IC1, by voltage-stablizer IC1 output+12V DC operating voltage, another way connects the input terminal of voltage-stablizer IC2,
By voltage-stablizer IC2 output+5V direct-current working volts；The output end of voltage-stablizer IC1 is connected to after filter capacitor C3 and capacitor C4
The emitter of triode Q5, resistance R10 is connected in series after filter capacitor C5 and capacitor C6 in the output end of voltage-stablizer IC2, then connects
It is connected to the input anode of optocoupler GO1, the input cathode of optocoupler GO1 connects signal control circuit, the negative pole of output end of optocoupler GO1
Ground connection, the output head anode of optocoupler GO1 are connected to the base stage of triode Q5 through base resistance R11, and the collector of triode Q5 is through electricity
Resistance R9 connects protective switch of the short circuit circuit.
The circuit composition of the protective switch of the short circuit circuit is to connect on the power supply line all the way of connection ac output end whole
Flow the input terminal of bridge ZQ1, the negative pole of output end ground connection of rectifier bridge ZQ1, the input pole of output head anode connection switch pipe Q1, switch
The control electrode of pipe Q1 connects power circuit, three tunnels of output stage point of switching tube Q1, and the first via is grounded through load current sample resistance R2,
Second tunnel (through the end ZA1) taps overload detection control circuit and virtual connection detection protection circuit, and third road connects triode through resistance R3
The base stage of Q2, the resistance R4 and resistance R5 that the collector of triode Q2 is concatenated are followed by power circuit, to obtain+12V DC work
Make voltage, the lead in the connecting node of resistance R4 and resistance R5 connects virtual connection detection protection circuit (through the end ZA3) all the way, another
Road connects the base stage of triode Q3, and the emitter of triode Q3 connects power circuit, three tunnels of collector point of triode Q3, first via warp
Resistance R6 and diode D1(are through the end ZA2) set detection control circuit is taken over, the second tunnel connection signal control circuit is controlled to signal
Circuit output short-circuit signal, third road are grounded after resistance R7 and resistance R8, are drawn in connecting node of the resistance R7 with resistance R8
Line connects the base stage of triode Q4, the emitter ground connection of triode Q4, and the collector of triode Q4 divides two-way, meets switching tube Q1 all the way
Control electrode, another way connects power circuit.
Tracking mode electronics fireproofing controller of the present invention has the following characteristics that
1, using high-speed electronic components, quickly identification and response, can capture the short circuit that climbing is more than 50A/ μ S in 1 μ S
Signal, and in 1 μ S internal cutting off power supply, the generation of short-circuit spark can be avoided completely；And then for the starting of the high current of electrical equipment
It will not cut off the power.
2, it when virtual connection (showing as circuit disconnection connection again) phenomenon occurring in circuit system, quickly cuts off the power,
Avoid the fire incident caused since virtual connection is struck sparks；It also can avoid because dash current is failure or damage caused by electrical equipment
It is bad.
3, the current protection value when value of risk set by the present invention is normal operation circuit；When for electrical equipment starting
The high current of generation, tracking mode electronics fireproofing controller of the present invention are to set automatically at random according to normal start up curve, and open
Running protection value is automatically restored to after dynamic process, therefore will not generate fire hazard when equipment or electrical appliance normal operation,
It not will use electric equipment to run in spite of illness.
Tracking mode electronics fireproofing controller of the present invention can effectively avoid electrical appliance or power supply line because of virtual connection, overload, short circuit
The generation of electrical fire accident caused by sparking etc., direct short-circuit no-spark is a kind of with ultrahigh speed detection, identification and control
The comprehensive fire-proof type electric-controlled switch of function processed.Due to can adjust automatically value of risk, thus any load can be adapted to automatically
High current starting, can save a variety of auxiliary such as overcurrent relay, the time relay, the contactor that GPF (General Protection False electric appliance must use
Appliance device, and it protects value of risk that can accomplish adaptation automatically and adjustment in real time, thus avoid existing ancillary apparatus device
The protection value of risk of part universal higher or equipment the drawbacks such as run in spite of illness, it can be achieved that electrical equipment complete protection.
The present invention can be also implemented in this way: a kind of tracking mode electronics fire prevention control method, in a friendship for constituting ac circuit
Rectifier bridge, the output termination switching tube and load current sample resistance of rectifier bridge, to constitute to described are connected in stream power supply line
Ac circuit carries out the DC control circuit of on-off control, and the control electrode of switching tube connects signal control circuit, takes in load current
When sample resistance detects load current and is abnormal, signal control circuit issues cut-off signals, turns off switching tube, disconnects direct current
Control loop, therefore rectifier bridge disconnects ac power supply line, and swift electron self-lock switch then passes through self-locking function and makes to switch
Pipe keeps lasting off state, and so that the load in ac circuit is remained powered off state (needs weight after short circuit, virtual connection phenomenon occur
Open), it avoids failure from continuing to spread or damage electrical appliance, is achieved in load and the short circuit of power supply line and overload protection.
Tracking mode overload protecting circuit is connected on swift electron self-lock switch, with adjust automatically load current value of risk,
The high current starting of various loads is adapted to, and distinguishes starting current and overload current.
It is connected to virtual connection detection protection circuit on swift electron self-lock switch, is occurred in load and power supply line with detecting
Virtual connection, when detecting virtual connection generation, control circuit issues command signal, with on-off switching tube, utilizes rectifier bridge to disconnect and exchanges
Power supply line realizes the virtual connection protection of circuit system.
The Electrical Safety protection that present invention can be suitably applied to manufacturing enterprise, all kinds of buildings and residential building etc., can replace each
The control cabinet of kind lathe, electrical equipment etc., can be greatly reduced deployment cost, and control performance more improves reliable, avoidable electricity
The diffusion of gas equipment run in spite of illness with failure.Due to its tight security, and it is explosion-proof to comply fully with intrinsic safety type
Every technical requirements of product, thus can be directly as inbeing safe explosion prevention products application in explosion-proof place.
Detailed description of the invention
Fig. 1 is the circuit block diagram of controller of the present invention.
Fig. 2 is power circuit and protective switch of the short circuit circuit this two-part circuit diagram.
Fig. 3 is starting current tracking adjustmenting circuit and overload detection control circuit this two-part circuit diagram.
Fig. 4 is the circuit diagram of virtual connection detection protection circuit.
Fig. 5 is the circuit diagram of signal control circuit.
Specific embodiment
As shown in Figure 1, tracking mode electronics fireproofing controller of the present invention include power circuit 1, protective switch of the short circuit circuit 2,
The portions such as signal control circuit 3, starting current tracking adjustmenting circuit 4, overload detection control circuit 5 and virtual connection detection protection circuit 6
Point.Virtual connection detection protection circuit 6 connects with protective switch of the short circuit circuit 2 and signal control circuit 3 respectively, for monitoring electrical appliance
Or the open circuit signaling of power supply line, when being judged as that virtual connection happens just to protective switch of the short circuit circuit and signal control circuit
Issue virtual connection power-off signal.Overload detection control circuit 5 connects with protective switch of the short circuit circuit 2 and signal control circuit 3 respectively,
For monitoring the overcurrent or partial short-circuit situation of electrical appliance, when being judged as that overload situations occur just to protective switch of the short circuit circuit
Overload power-off signal is issued with signal control circuit.Protective switch of the short circuit circuit 2 detects protection circuit 6, overload with virtual connection respectively
Detection control circuit 5, signal control circuit 3 and power circuit 1 connect, for short circuit, virtual connection to occur in electrical appliance, power supply line
Or pass through swift electron self-locking switch circuit interrupting power circuit when overload situations.Starting current tracking adjustmenting circuit 4 respectively with
Overload detection control circuit 5 and signal control circuit 3 connect, for tracking the starting current of electrical appliance, and with starting current
Variation corresponding adjustment is made to protection value.Signal control circuit 3 detects protection circuit 6, overload detection control with virtual connection respectively
Circuit 5, protective switch of the short circuit circuit 2 and starting current tracking adjustmenting circuit 4 processed connect, for electrical appliance and power supply line
Immediate status is indicated.Power circuit 1 connects with each part mentioned above, while providing working volts alternating current for load, also
Direct-current working volts are provided for each part mentioned above circuit.
Power circuit 1 includes 12V2A power supply and 5V1A two parts.The response time of protective switch of the short circuit circuit 21 μ S with
Under, while also having both virtual connection power-off control function.Signal control circuit 3 is responsible for circuit immediate status (such as operation, short circuit, virtual connection
And overload) instruction.Starting current tracking adjustmenting circuit 4 is that (current-rising-rate is not more than when electrical appliance normally starts
If being more than 50A/ μ S, that this climbing is considered as short circuit), electric current rapid increase, value of risk also follow rising, and starting current is by low
Supreme, then again from high to low, the value of risk when it drops to current balance is normal operating value.Overload detection control electricity
Road 5 is to implement precisely detection and protection when overcurrent or partial short-circuit situation occurs, effectively to avoid failure from continuing to spread or damage
Ruin electrical appliance.What virtual connection detection protection circuit 6 was taken is to detect open circuit signaling at any time, and when connecting again after open lines
Virtual connection signal is issued, and circuit of cutting off the power immediately, to avoid the generation of virtual connection spark.
As shown in Fig. 2, the particular circuit configurations of power circuit 1 are, ac input end connects exchange output through protector BX1
End, is connected in parallel to capacitor C1 and varistor Ry1 between two connecting terminals of ac input end, from ac input end
The original side of lead connection transformer B1 on two connecting terminals, after the losing side of transformer B1 rectified bridge ZQ2 and filter capacitor C2
Divide two-way, connects the input terminal of voltage-stablizer IC1 all the way, by voltage-stablizer IC1 output+12V DC operating voltage, another way connects voltage-stablizer
The input terminal of IC2, by voltage-stablizer IC2 output+5V direct-current working volts；The output end of voltage-stablizer IC1 is through filter capacitor C3 and electricity
After holding C4, it is connected to the emitter of triode Q5, after filter capacitor C5 and capacitor C6, series connection connects the output end of voltage-stablizer IC2
Connecting resistance R10, is connected to the input anode of optocoupler GO1, and the input cathode of optocoupler GO1 connects signal control circuit, optocoupler
The negative pole of output end of GO1 is grounded, and the output head anode of optocoupler GO1 is connected to the base stage of triode Q5, triode through base resistance R11
The collector of Q5 connects protective switch of the short circuit circuit 2 through resistance R9.
The particular circuit configurations of protective switch of the short circuit circuit 2 are connected on the power supply line all the way of connection ac output end
The input terminal of rectifier bridge ZQ1, negative pole of output end (i.e. diode cathode) ground connection of rectifier bridge ZQ1, output head anode (i.e. diode
Cathode) be connected to switching tube field-effect tube Q1 drain electrode, the grid of field-effect tube Q1 connects the resistance in power circuit 1 all the way
R9 is grounded through discharge resistance R1 all the way, and three tunnels of source electrode point of field-effect tube Q1, the first via connects through load current sample resistance R2
Ground, the second tunnel tap overload detection control circuit 5 and virtual connection detection protection circuit 6 through the end ZA1, and third road connects three poles through resistance R3
The base stage of pipe Q2, the resistance R4 and resistance R5 that the collector of triode Q2 is concatenated be followed by power circuit+12V DC voltage is defeated
Outlet, to obtain+12V DC operating voltage, the lead in the connecting node of resistance R4 and resistance R5 is terminated through ZA3 empty all the way
Detection protection circuit 6 is connect, another way connects the base stage of triode Q3, and the emitter of triode Q3 connects the voltage-stablizer in power circuit 1
IC1+12V DC operating voltage output end, three tunnels of collector point of triode Q3, the first via is through resistance R6 and diode D1 warp
ZA2 terminates overload detection control circuit 5, the second tunnel connection signal control circuit 3, to 3 output short-circuit signal of signal control circuit,
Third road is grounded after resistance R7 and resistance R8, and lead connects the base of triode Q4 in the connecting node of resistance R7 and resistance R8
Pole, the emitter ground connection of triode Q4, the collector of triode Q4 divide two-way, connect the grid of field-effect tube Q1, another way all the way
The collector of triode Q5 is connect through the resistance R9 in power circuit 1.
In Fig. 2,220V alternating current (for three-phase 380V alternating current, needing to configure three sets of this controllers) is through protector BX1
Varistor Ry1 (471) are connected to, as lightning protection device.Capacitor C1 is the interference absorber part of upper frequency.Rectifier bridge
The input terminal of ZQ1 is directly connected to through loading protector for connection BX1, another input terminal with 220V alternating current.The output end of rectifier bridge ZQ1
Field-effect tube can be selected in connection switch pipe Q1(switching tube or IGBT, the present embodiment illustrate by taking field-effect tube as an example), field-effect tube
Q1(for ease of illustration and understand, be employed herein it is identical with switching tube label " Q1 ") source electrode and rectifier bridge ZQ1 cathode
Connection, when the grid of field-effect tube Q1 has signal voltage, field-effect tube Q1 conducting, rectifier bridge ZQ1 work, load can obtain electric
Work, resistance R1 are the gate discharge resistance of field-effect tube Q1；Resistance R2 is the load current sample resistance of power supply line.Short
In road protective switch circuit 2, constituted fastly by the high-frequency triode Q2-Q4 and resistance R3-R8 of characteristic frequency 100MHz or more
Fast electronics self-lock switch.
Circuit initialization process is that after power supply is connected, 220V alternating current is depressured through protector BX1 and transformer B1, electricity
After holding C2 filtering, it is connected to voltage-stablizer IC1(and selects 78M12 voltage-stablizer) and 7805 voltage-stablizers of voltage-stablizer IC2(selection).Voltage-stablizer
IC1 output+12V stable direct-current working volts provide power supply for short-circuit protection circuit 2；Voltage-stablizer IC2 is signal control circuit
3 offer+5V stable direct-current working volts.
As shown in figure 5, the circuit structure of signal control circuit 3 is, with single-chip microcontroller IC3(AT89S2051) for core element,
The P3.3 foot input terminal of single-chip microcontroller IC3 takes over the overload detection signals of set detection control circuit output, the P3.4 foot of single-chip microcontroller IC3
The virtual connection of input termination virtual connection detection protection circuit output detects signal, the P3.5 foot input termination triode Q6 of single-chip microcontroller IC3
Collector, the base stage of triode Q6 connects the short-circuit detection signal of protective switch of the short circuit circuit output, monolithic through base resistance R18
The P3.7 foot output end of machine IC3 is connected to the input cathode of the optocoupler GO1 in power-supplying circuit；The Vcc foot of single-chip microcontroller IC3
It is connected to the output end of the voltage-stablizer IC2 in power circuit, to obtain+5V direct-current working volts, also, in the Vcc of single-chip microcontroller IC3
Reset switch AN1 and capacitor C7 are also respectively connected between foot and RST foot, P1.4 to the P1.7 foot of single-chip microcontroller IC3 respectively connects
(total four tunnels) light emitting diode indicating circuit, the P3.7 foot of single-chip microcontroller IC3 are connected to optocoupler in power circuit through the end QD1 all the way
The input cathode of GO1.2-LED5 of Light-emitting diode LED in four light emitting diode indicating circuits refers to respectively as operation
Show, short circuit instruction, overload indicates and virtual connection instruction, the hair for separately having a routing Light-emitting diode LED 1 and resistance R13 to be composed in series
Optical diode indicating circuit is as power supply instruction.
As shown in Fig. 5, Fig. 2, the automatic starting that is programmed to be powered of signal control circuit 3, single-chip microcontroller IC3 after energization
P3.7 foot exports low level (Fig. 2) to the input cathode of optocoupler GO1 through the end QD1, and the input anode of optocoupler GO1 is through current limliting electricity
Resistance R10 is connected to the output end of voltage-stablizer IC2 in power circuit, obtains the direct-current working volts of+5V, thus leads optocoupler GO1
Lead to, and be connected to the base stage of triode Q5 through resistance R11, triode Q5 is connected, therefore the grid of field-effect tube Q1 obtains letter
Number voltage and force conducting, so that controller of the present invention is entered normal working condition.
When occurring short-circuit signal (current-rising-rate meets or exceeds 50A/ μ S) in load circuit, sample resistance R2 is loaded
The crest voltage at both ends will be more than 0.7V, and high-velocity electrons self-lock switch can lock conducting immediately, locking process are as follows: load takes
The voltage at the both ends sample resistance R2 is more than 0.7V, and triode Q2 obtains base current through resistance R3 and is connected, and triode Q3 is also therewith
Conducting, and provide electric current to the base stage of triode Q2 in turn again through resistance R6, and (namely locking is led for permanent retention this state
Logical state), and triode Q4 is also with being connected therewith, and by the grid shorted to earth of field-effect tube Q1, to close field-effect
Pipe Q1, closing velocity are below 2 μ S.That is, the maximum time of short circuit current does not exceed 2 μ S, and this duration
Under short circuit current be cannot produce it is pyrophoric.
As shown in figure 3, the circuit structure of starting current tracking adjustmenting circuit is, it is defeated by the voltage-stablizer IC1 in power circuit 1
Out+12V DC power supply point three tunnels, the first via connects the input terminal of voltage-stablizer IC4, and the second tunnel connects triode through base resistance R22
The base stage of Q7, third road connect the collector of triode Q7, what the output termination of voltage-stablizer IC4 was composed in series by resistance R20 and R21
Branch is divided, the inverting input terminal of amplifier IC5A is connect by the connecting node lead of resistance R20 and resistance R21, amplifier IC5A's
Homophase input is terminated with the differential circuit being made of resistance R19 and capacitor C10, connects short circuit in one end (through the end ZA1) of resistance R19
Protective switch circuit is connected to feedback resistance R23, the output of amplifier IC5A between the output end and inverting input terminal of amplifier IC5A
Tri- tunnel Duan Fen, the first via take over set detection control circuit, and the second tunnel connects the base stage of triode Q7 through resistance R25 and capacitor C12, the
Three tunnels connect the base stage of triode Q8, the emitter ground connection of triode Q8, the collector series connection resistance of triode Q8 through resistance R27
The swift electron self-lock switch in protective switch of the short circuit circuit is connect (through the end ZA2) after R28.
The circuit structure of overload detection control circuit is, by the voltage-stablizer IC1 output in power circuit 1+12V DC electricity
Source is grounded after resistance R24 and voltage-stabiliser tube DW1, connects amplifier IC5B's from lead in the connecting node of resistance R24 and voltage-stabiliser tube DW1
Inverting input terminal, the non-inverting input terminal of amplifier IC5B connect the amplifier IC5A's in starting current tracking adjustmenting circuit through resistance R26
Output end, the output end of amplifier IC5B connect the base stage of triode Q10 through resistance R33, and the collector of triode Q10 connects signal control
The P3.3 foot of single-chip microcontroller IC3 in circuit detects signal to 3 output overloading of signal control circuit, and the emitter of triode Q10 connects
Ground.The bleeder circuit that the collector of triode Q7 in starting current tracking adjustmenting circuit is formed via resistance R30 and resistance R32
After be grounded, the divider node lead of resistance R30 and resistance R32 connect the base stage of triode Q9, and the collector of triode Q9 is through resistance
After R31, it is connected to the non-inverting input terminal of amplifier IC5B all the way, another way is grounded through capacitor C13.
Starting current tracking adjustmenting circuit and overload detection control circuit are combined into an entirety, constitute a kind of tracking mode
Overload protecting circuit.The protection value of the circuit by the resistance value of the load current sample resistance R2 in protective switch of the short circuit circuit 2 Lai
It determines, is equal to operation or rated power by protected consuming device also to determine.For example, the electric appliance total work of one family
Rate is 8800W, and rated current is about 40A(peak point current about 56A), then, the resistance value of load current sample resistance R2 is exactly
12.5m Ω, power are 8 constantan-made resistances parallel connections composition that 100m Ω 5W can be selected in 40W().Starting or pause when normal work
Situation can occur at any time, since starting current is much larger than running current, (sent out in no short-circuit conditions when high current starts
When raw), the electric current of the upper end load current sample resistance R2 (i.e. the end ZA1) gradually rises, and forms through resistance R19 and capacitor C10
Differential circuit delay after, be connected to the non-inverting input terminal (3 foot) of amplifier IC5A, and the partial pressure circuit of steady voltage of inverting input terminal
(series circuit of resistance R20 and resistance R21) is obtained by adjustable voltage stabilizer IC4(LM317), resistance R20 and the partial pressure of resistance R21
Obtain the constant pressure value of 0.68V；When the voltage at the end ZA1 7 μ S of delay rise to greater than 0.68V, the circuit conducting of amplifier IC5A, this
When, the output end (1 foot) of amplifier IC5A exports high level, and provides base current through resistance R27 for triode Q8, makes triode
Q8 conducting, the current collection of triode Q8 extremely low level, then through the end resistance R28 and ZA2, be connected in swift electron self-lock switch
The base stage of triode Q2 forces swift electron self-lock switch to enter high current start-up mode.If load is normally to start, must
Can so meet electric current rapid increase after and slowly decline the start-up mode of this start up curve；Due to the electricity of entire start-up course
Stream is all greater than running current value, and the length of electric current decline process differs greatly, so in starting current tracking adjustment electricity
Electric current decline tracking circuit is devised in road.In Fig. 3, electric current decline is constituted by resistance R25, capacitor C12 and triode Q7 and is chased after
Track circuit.After loading starting, high level is presented in the output end (1 foot) of amplifier IC5A, is the fortune that circuit keeps nonoverload at this time
Row state；When starting current is in descending branch, triode Q8 can exit saturation conduction, output end (1 foot) electricity of amplifier IC5A
Position starts slowly decline, and charges to capacitor C12, which can provide base current for triode Q7, force triode
Q7 saturation conduction, triode Q9 are also connected therewith, and discharge through resistance R31 capacitor C13, make the non-inverting input terminal of amplifier IC5B
The current potential of (5 foot) declines, and avoids its output overloading signal.Only after electric current decline process, be possible to detect
It carries and output overloading signal.The output of overload signal is output end (7 foot), the capacitor C14, resistance R33, resistance by amplifier IC5B
What the circuit of the compositions such as R34, triode Q10 was completed, meanwhile, overload signal is also connected to the single-chip microcontroller in signal control circuit 3
The P3.3 foot of IC3 is shown by controlling the corresponding LED signal of progress in single-chip microcontroller, and exports high level by P3.7 foot, makes power supply
Optocoupler G01 in circuit 1 ends (Fig. 2), and the triode Q5 to connect with optocoupler G01 ends therewith, and field-effect tube Q1 loses because of grid
It removes signal voltage and turns off, so that rectifier bridge ZQ1 is disconnected AC load circuit, to realize overload protection.
As shown in figure 4, virtual connection detection protection circuit circuit structure be, by power circuit voltage-stablizer IC1 output+
12V DC power supply is grounded after the resistance R38 through being sequentially connected in series, resistance R39 and capacitor C17 all the way, and another way meets voltage-stablizer IC6
Input terminal, the bleeder circuit that is made of resistance R37 and resistance R36 of output termination of voltage-stablizer IC6, resistance R37 and resistance R36
Divider node be connected to the inverting input terminal of amplifier IC7, the non-inverting input terminal of amplifier IC7 is via resistance R35 and capacitor C15 group
At differential circuit after, (through the end ZA1) connects protective switch of the short circuit circuit 2, and the output end of amplifier IC7 is connected to resistance R39 and electricity
Hold in the connecting node between C17, the base stage of triode Q11 is connected in the connecting node of resistance R38 and resistance R39, three poles
The emitter of pipe Q11 connects+12V DC power supply, and the collector of triode Q11 is grounded through resistance R40 all the way, and another way is through resistance
R41 connects 14 feet of counter IC8, after 4 feet and 7 feet of counter IC8 respectively connect a diode (D2, D3), be connected to altogether by
The divider node lead of the bleeder circuit of resistance R43 and resistance R44 composition, resistance R43 and resistance R44 are connected to triode Q12
Base stage, the collector of triode Q12 connects protective switch of the short circuit circuit, another way warp after series resistor R45 (through the end ZA3) all the way
Diode D4 connects the P3.4 foot of the single-chip microcontroller IC3 in signal control circuit 3.
In Fig. 4, the voltage at the both ends load sample resistance R2 in protective switch of the short circuit circuit (Fig. 2) is connected to through the end ZA1
After the differential circuit being made of in virtual connection detection protection circuit 6 resistance R35 and capacitor C15, it is connected to the non-inverting input terminal of amplifier IC7
(3 foot), working voltage under normal conditions is in 0.4V or more；The inverting input terminal (2 foot) of amplifier IC7 is by voltage-stablizer IC6 and resistance R37
The constant voltage that partial pressure value is 10mV is provided with resistance R36, so the output end (1 foot) of amplifier IC7 remains high level.When
Occur just will appear of short duration when open circuit broken string (broken string factor is usually connector corrosion, aging, cracking etc.) in ac power supply line
Zero current or micro-current so that there is no-voltage in the non-inverting input terminal (3 foot) of amplifier IC7, and the output end (1 of amplifier IC7
Foot) it may occur in which low level, PNP triode Q11 can be connected at this time, and high level, counter IC8 occurs in collector
(CD4017) 14 foot input terminals are also high level, and 3 foot output ends become low level from high level, and 2 foot output ends are by low electricity
It is flat to become high level；When route is connected to again, the output end (1 foot) of amplifier IC7 is high level, and triode Q11 cut-off counts
The 14 foot input terminals of device IC8 are low level, and the output of counter is constant, if repeating the situation that breaks at this time, can be determined as
There is virtual connection situation in route.At this point, the 4 foot output ends of counter IC8 are high level, and through diode D2 and resistance R43, make three
Pole pipe Q12 conducting, the collector of triode Q12 become low level, and the resistance R45 which is concatenated all the way, (through the end ZA3) is defeated
Out to the base stage (Fig. 2) of the triode Q3 in protective switch of the short circuit circuit, swift electron self-lock switch is opened, turns off field-effect tube
Q1 makes rectifier bridge ZQ1 disconnect AC load circuit, to realize that virtual connection is protected.
Claims (8)
1. a kind of tracking mode electronics fireproofing controller, characterized in that include:
Virtual connection detection protection circuit, connects respectively with protective switch of the short circuit circuit and signal control circuit, for monitoring electrical appliance
Or the open circuit signaling of power supply line, when being judged as that virtual connection happens just to protective switch of the short circuit circuit and signal control circuit
Issue virtual connection power-off signal；
Overload detection control circuit connects respectively with protective switch of the short circuit circuit and signal control circuit, for monitoring electrical appliance
Overcurrent or partial short-circuit situation, when be judged as overload situations occur when just to protective switch of the short circuit circuit and signal control circuit
Issue overload power-off signal；
Protective switch of the short circuit circuit detects protection circuit, overload detection control circuit, signal control circuit and electricity with virtual connection respectively
Source circuit connects, for passing through swift electron self-lock switch when short circuit, virtual connection or overload situations occur for electrical appliance, power supply line
Circuit interrupting power circuit；
Starting current tracking adjustmenting circuit, connects with signal control circuit, for tracking the starting current of electrical appliance, and with opening
The variation of streaming current makes corresponding adjustment to protection value；
Signal control circuit detects protection circuit, overload detection control circuit, protective switch of the short circuit circuit respectively and is opened with virtual connection
Streaming current tracking adjustmenting circuit connects, and indicates for the immediate status to electrical appliance and power supply line；And
Power circuit provides working volts alternating current for load, and provides direct-current working volts for each part mentioned above circuit.
2. tracking mode electronics fireproofing controller according to claim 1, characterized in that the circuit of the power circuit is constituted
It is that ac input end connects ac output end through protector BX1, is connected in parallel between two connecting terminals of ac input end
Capacitor C1 and varistor Ry1, from the original side of lead connection transformer B1 on two connecting terminals of ac input end, transformer
Divide two-way after the losing side of B1 rectified bridge ZQ2 and filter capacitor C2, connects the input terminal of voltage-stablizer IC1 all the way, it is defeated by voltage-stablizer IC1
Out+12V DC operating voltage, another way connect the input terminal of voltage-stablizer IC2, by voltage-stablizer IC2 output+5V direct-current working volts；
The output end of voltage-stablizer IC1 is connected to the emitter of triode Q5 after filter capacitor C3 and capacitor C4, and voltage-stablizer IC2's is defeated
Outlet is connected in series resistance R10, is connected to the input anode of optocoupler GO1, optocoupler after filter capacitor C5 and capacitor C6
The input cathode of GO1 connects signal control circuit, and the negative pole of output end ground connection of optocoupler GO1, the output head anode of optocoupler GO1 is through base
Electrode resistance R11 is connected to the base stage of triode Q5, and the collector of triode Q5 connects protective switch of the short circuit circuit through resistance R9.
3. tracking mode electronics fireproofing controller according to claim 2, characterized in that the protective switch of the short circuit circuit
Circuit composition is the input terminal of rectifier bridge ZQ1 to be connected on the power supply line all the way of connection ac output end, rectifier bridge ZQ1's is defeated
Outlet cathode ground connection, the input pole of output head anode connection switch pipe Q1, the control electrode of switching tube Q1 connect power circuit, switching tube
The output stage of Q1 point three tunnels, the first via are grounded through load current sample resistance R2, the second tunnel tap overload detection control circuit and
Virtual connection detection protection circuit, third road connects the base stage of triode Q2, the resistance that the collector of triode Q2 is concatenated through resistance R3
R4 and resistance R5 are followed by power circuit, to obtain+12V DC operating voltage, draw in connecting node of the resistance R4 with resistance R5
Line connects virtual connection detection protection circuit all the way, and another way connects the base stage of triode Q3, and the emitter of triode Q3 connects power circuit,
Three tunnels of the collector of triode Q3 point, the first via take over set detection control circuit, the connection of the second tunnel through resistance R6 and diode D1
Signal control circuit, to signal control circuit output short-circuit signal, third road is grounded after resistance R7 and resistance R8, in resistance R7
The base stage of triode Q4, the emitter ground connection of triode Q4, the current collection of triode Q4 are connect with lead in the connecting node of resistance R8
Two-way is divided in pole, connects the control electrode of switching tube Q1 all the way, and another way connects power circuit.
4. tracking mode electronics fireproofing controller according to claim 3, characterized in that the circuit of the signal control circuit
Composition is, using single-chip microcontroller IC3 as core element, the P3.3 foot input terminal of single-chip microcontroller IC3 takes over the output of set detection control circuit
The virtual connection of overload detection signals, the P3.4 foot input termination virtual connection detection protection circuit output of single-chip microcontroller IC3 detects signal, monolithic
The collector of the P3.5 foot input termination triode Q6 of machine IC3, the base stage of triode Q6 connect short-circuit protection through base resistance R18 and open
The short-circuit detection signal of circuit output is closed, the P3.7 foot output end of single-chip microcontroller IC3 is connected to the optocoupler GO1 in power-supplying circuit
Input cathode；The Vcc foot of single-chip microcontroller IC3 is connected to the output end of the voltage-stablizer IC2 in power circuit, to obtain+5V direct current
Operating voltage, also, reset switch AN1 and capacitor C7, monolithic is also respectively connected between the Vcc foot and RST foot of single-chip microcontroller IC3
P1.4 to the P1.7 foot of machine IC3 respectively connects light emitting diode indicating circuit all the way, and the P3.7 foot of single-chip microcontroller IC3 connects power circuit
The input cathode of middle optocoupler GO1.
5. tracking mode electronics fireproofing controller according to claim 4, characterized in that the virtual connection detection protection circuit
Circuit composition be, by power circuit voltage-stablizer IC1 output+12V DC power supply, all the way the resistance R38 through being sequentially connected in series,
It is grounded after resistance R39 and capacitor C17, another way connects the input terminal of voltage-stablizer IC6, and the output of voltage-stablizer IC6 is terminated by resistance R37
With the bleeder circuit of resistance R36 composition, the divider node of resistance R37 and resistance R36 are connected to the inverting input terminal of amplifier IC7,
The non-inverting input terminal series resistor R35 of amplifier IC7 is followed by protective switch of the short circuit circuit, and the output end of amplifier IC7 is connected to resistance
In connecting node between R39 and capacitor C17, the base stage of triode Q11 is connected to the connecting node of resistance R38 Yu resistance R39
On, the emitter of triode Q11 connects+12V DC power supply, and the collector of triode Q11 is grounded through resistance R40 all the way, another way
14 feet of counter IC8 are connect through resistance R41,4 feet and 7 feet of counter IC8 are connected to altogether after respectively connecting a diode by electricity
The bleeder circuit of R43 and resistance R44 composition is hindered, the divider node lead of resistance R43 and resistance R44 is connected to triode Q12's
Base stage, series resistor R45 is followed by protective switch of the short circuit circuit to the collector of triode Q12 all the way, and another way connects through diode D4
The P3.4 foot of single-chip microcontroller IC3 in signal control circuit.
The control method 6. a kind of tracking mode electronics is prevented fires, characterized in that on an ac power supply line for constituting ac circuit
Rectifier bridge is connected, the output termination switching tube and load current sample resistance of rectifier bridge carry out the ac circuit to constitute
The DC control circuit of on-off control, the control electrode of switching tube connect signal control circuit, detect in load current sample resistance
When load current is abnormal, signal control circuit issues cut-off signals, turns off switching tube, disconnects DC control circuit, whole
Therefore stream bridge disconnects ac power supply line, and swift electron self-lock switch then passes through self-locking function and switching tube is made to keep lasting
Off state makes the load in ac circuit remain powered off state, is achieved in load and the short circuit of power supply line and overload is protected
Shield.
The control method 7. tracking mode electronics according to claim 6 is prevented fires, characterized in that on swift electron self-lock switch
It is connected to tracking mode overload protecting circuit, with adjust automatically load current value of risk, adapts to the high current starting of various loads, and area
Divide starting current and overload current.
The control method 8. tracking mode electronics according to claim 6 is prevented fires, characterized in that on swift electron self-lock switch
It is connected to virtual connection detection protection circuit, to detect the virtual connection occurred in load and power supply line, when detecting virtual connection generation, control
Circuit issues command signal, with on-off switching tube, disconnects ac power supply line using rectifier bridge, realizes that the virtual connection of circuit system is protected
Shield.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910105665.1A CN109687390B (en) | 2019-02-01 | 2019-02-01 | Tracking type electronic fire-proof controller and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910105665.1A CN109687390B (en) | 2019-02-01 | 2019-02-01 | Tracking type electronic fire-proof controller and control method thereof |
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| CN109687390B CN109687390B (en) | 2020-03-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350899A (en) * | 2019-08-09 | 2019-10-18 | 广东福田电器有限公司 | Noncontacting switch |
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| CN203660494U (en) * | 2013-12-25 | 2014-06-18 | 上海第二工业大学 | Device for realizing quick broken circuit protection in alternating-current circuit by using single IGBT tube |
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|---|---|---|---|---|
| CN2059774U (en) * | 1989-06-26 | 1990-07-25 | 张玉敏 | Power failure self-cut-off device |
| CN2342509Y (en) * | 1998-06-29 | 1999-10-06 | 胡新锁 | Anti-fire protector for AC loop |
| CN102130439A (en) * | 2011-03-16 | 2011-07-20 | 天津市鸿远电气设备有限公司 | Leakage protection switch with virtual connection preventing function |
| CN103107769A (en) * | 2011-11-10 | 2013-05-15 | 富士电机株式会社 | Power conversion device and over-current protection circuit |
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| CN109687390B (en) | 2020-03-10 |
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