CN101060242B - Current anomaly protective circuit - Google Patents
Current anomaly protective circuit Download PDFInfo
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- CN101060242B CN101060242B CN2007100970192A CN200710097019A CN101060242B CN 101060242 B CN101060242 B CN 101060242B CN 2007100970192 A CN2007100970192 A CN 2007100970192A CN 200710097019 A CN200710097019 A CN 200710097019A CN 101060242 B CN101060242 B CN 101060242B
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Abstract
The protective circuit for abnormal current comprises: a power unit for supplying power to other units, a current detection unit to detect objective current and generate relative signal for abnormal current to send to the next unit, a control unit generating relative control signal according to its received signal, and an executive unit to cut the wire according to control signal. This invention can cut the fire line or both zero and fire lines simultaneously to prevent electric larceny or leakage, or prevent burning out the electric equipment and the fire hazard, so as to effectively guarantee the properties of the electric power department and the terminal user are not lose..
Description
The application is 200610018814.3 Chinese patent application based on the application number of submitting on April 18th, 2006, and requires its priority.The full content of aforementioned application is incorporated this paper by reference into.
Technical field
The present invention relates to the electrical management technology, relate in particular to a kind of protective circuit of tackling the current anomaly phenomenon.
Background technology
At present, unusual such situation appears in the electric current of running in the electrical network through regular meeting in administration of power networks.For example, when having electricity filching behavior or leaky in the electrical network, electric current will occur unusually.In this case, power supply department or terminal use's electric power property will suffer heavy losses.For another example, when terminal use's load is excessive, also can cause anomalies such as electric current increase, the electric current of this increase gently then can burn out power consumption equipment, heavy then fire hazardous.Therefore, do not suffer a loss, need to take effective measure to tackle the current anomaly phenomenon in the electrical network urgently for the property that ensures power department and terminal use.Yet, also do not have comparatively effectively counter-measure in the existing administration of power networks at above-mentioned current anomaly phenomenon.
Summary of the invention
For solving the problems of the technologies described above; the invention provides a kind of current anomaly protective circuit; it can live wire in the line disconnection occur when unusual or cut off live wire simultaneously and the power line of zero line is connected at electric current; to stop electricity filching behavior or leaky; perhaps prevent to burn out power consumption equipment and breaking out of fire, and then guarantee that effectively power department and terminal use's property do not suffer a loss.
For this reason, technical scheme of the present invention is: a kind of current anomaly protective circuit is provided, it comprises power subsystem, current detecting unit, control unit and performance element, and wherein, described power subsystem is used to described current detecting unit, control unit and performance element that operating voltage is provided; Described current detecting unit comprises the current balance type detection sub-unit, be used for detecting disequilibrium between the live wire electric current of test line and the neutral line current, the current balance type detection sub-unit comprises the copper-manganese sheet and first comparator of paired setting, the first copper-manganese sheet in a pair of copper-manganese sheet of described paired setting and the second copper-manganese sheet are serially connected in the live wire of test line respectively and are serially connected in the zero line of test line, corresponding to the electric current that flows through described copper-manganese sheet, the two ends of the described first copper-manganese sheet produce first voltage difference, the described second copper-manganese sheet produces second voltage difference, described first voltage difference and second voltage difference are through after amplifying, isolate in-phase input end and the inverting input that transfers to described first comparator by the signal isolation circuit that comprises light-emitting diode and phototriode of correspondence respectively again, and when described first voltage difference and second voltage difference are unequal, described first comparator will represent that unbalanced high level signal transfers to described control unit between live wire electric current and the neutral line current; Described control unit produces control signal corresponding according to the signal of telecommunication from described current detecting unit, and described control signal is transferred to performance element; Described performance element moves according to described control signal, connects with the power line that cuts off the place circuit.
Wherein, described current detecting unit comprises the load current detection sub-unit, and when the load current in the test line was excessive, described load current detection sub-unit just produced the corresponding with it signal of telecommunication, and transmitted it to described control unit.
Preferably, described load current detection sub-unit comprises the load current detecting element and second comparator, described load current detecting element comprises the copper-manganese sheet, described copper-manganese sheet is serially connected in the live wire of test line, corresponding to the live wire electric current that flows through described copper-manganese sheet, described copper-manganese sheet produces the correspondent voltage signal, and transmit it to the in-phase input end of described second comparator, described second comparator compares described voltage signal and the second predetermined reference voltage value that is input to its inverting input, when the voltage signal from described copper-manganese sheet is higher than described second reference voltage value, described second comparator will represent that the excessive high level signal of load transfers to described control unit.
Preferably, described second reference voltage value is adjustable according to actual needs.
Preferably, current anomaly protective circuit provided by the invention also comprises the moving envelope detecting unit of electronics envelope, and whether its envelope body that is used to detect described electronics envelope is by loosening, if detect described envelope body by loosening, just produce the described envelope body of expression by the loosening signal of telecommunication, and transmit it to control unit; Described control unit produces control signal corresponding according to the signal of telecommunication that seals detecting unit automatically, and described control signal is transferred to performance element; Described performance element moves according to described control signal, connects with the power line that cuts off the place circuit.
Wherein, described moving envelope detecting unit comprises pressure sensor or normal open switch.Described pressure sensor detects the pressure during less than set point that comes self-styled body, just produces the described envelope body of expression by the loosening moving envelope signal of telecommunication, and transmits it to control unit.When described normal open switch was become flexible at described Feng Tiwei, its moving contact contacted with fixed contact under the compressing of envelope body, and normal open switch is in closure state; When described envelope body was become flexible, described moving contact separated with fixed contact, and normal open switch is in off-state, just produced the described envelope body of expression by the loosening moving envelope signal of telecommunication, and transmitted it to control unit.
Preferably, the executive component of described performance element is a relay.
Preferably, described control unit also comprises the triode that is at least two-stage cascade, when current anomaly, and the conducting of first order triode, second level triode ends, and makes the described actuating of relay connect with the power line that cuts off the place circuit; Electric current recover normal after, first order triode ends, second level triode conducting makes described relay auto-closing and the power line that recovers the place circuit connect.
With respect to prior art, beneficial effect of the present invention is: because current anomaly protective circuit provided by the invention comprises current detecting unit, control unit and performance element, like this, in case occur current anomaly in the circuit, current detecting unit just produces and this current anomaly corresponding voltage signal, and this voltage signal is transferred to control unit; Control unit compares this voltage signal with predefined reference voltage value, in case this voltage signal departs from reference voltage value, just send control signal to performance element, the power line that cuts off the place circuit with control execution unit connects (promptly, cut off supply of electric power), so just, can stop electricity filching behavior or leaky effectively, perhaps prevent to burn out power consumption equipment and avoid breaking out of fire, and then can guarantee that power department and terminal use's property do not suffer a loss.
In addition, in a preferred implementation provided by the invention, the moving envelope detecting unit that also comprises the electronics envelope, when detecting described envelope body when loosening, should just produce the described envelope body of expression by the loosening signal of telecommunication by moving envelope detecting unit, and transmitting it to control unit, control unit produces control signal corresponding according to this signal of telecommunication and comes control execution unit to move, and connects with the power line that cuts off the place circuit.So just can be when electric current occur unusual and/or the stealing of the moving envelope of people is arranged, the power line that can cut off the place circuit connects, thus the property that more effectively guarantees power department and terminal use is not suffered a loss.
Have again, in a preferred implementation provided by the invention, control unit can adopt the mode of three triode cascades (certain, can or be the mode of more a plurality of triode cascades also) for the mode of two triode cascades, so just, can be when current anomaly, make the conducting of first order triode, second level triode ends, and the control relay action connects with the power line that cuts off the place circuit; And after electric current recovers normally, first order triode is ended, and second level triode conducting, control relay auto-closing and the power line connection that recovers the place circuit, thus the trouble of having removed manual closing operation from has been saved artificial.
Description of drawings
Fig. 1 is the theory diagram of the current anomaly protective circuit of first embodiment of the invention;
Fig. 2 is the physical circuit figure of the current anomaly protective circuit in the first embodiment of the invention;
The physical circuit figure that Fig. 3 seals for the electronics that is adopted in the first embodiment of the invention;
Fig. 4 is the another kind of implementation of moving envelope detecting unit among Fig. 3;
The mechanical structure schematic diagram that Fig. 5 seals for the electronics that is adopted in the first embodiment of the invention;
Fig. 6 is the structural representation of envelope body when loosening of electronics shown in Figure 5 envelope;
Fig. 7 is the theory diagram of the current anomaly protective circuit of second embodiment of the invention;
Fig. 8 is the physical circuit figure of the current anomaly protective circuit of second embodiment of the invention.
Embodiment
For making those skilled in the art person understand the solution of the present invention better, current anomaly protective circuit provided by the invention is described in detail below in conjunction with accompanying drawing.
See also Fig. 1, current anomaly protective circuit provided by the invention comprises power subsystem 210, current detecting unit 220, control unit 230 and performance element 240.Wherein, current detecting unit 220 comprises current balance type detection sub-unit 221 and load current detection sub-unit 222 again.
Preferably, current anomaly protective circuit provided by the invention can also have the function of electronics envelope.That is, current anomaly protective circuit provided by the invention can also comprise moving envelope detecting unit 250, and whether the envelope body that seals in order to detected electrons is become flexible.If moving envelope detecting unit 250 detects the envelope body by loosening, just produce this envelope body of expression by the 3rd loosening signal of telecommunication, and transmit it to control unit 230; Control unit 230 produces control signal corresponding according to the 3rd signal of telecommunication, and this control signal is transferred to performance element 240; This performance element 240 moves according to this control signal, to cut off the supply of electric power of place circuit.
Wherein, the detecting element of moving envelope detecting unit 250 can be pressure sensor.When this pressure sensor detects the pressure during less than set point that comes self-styled body, just produce this envelope body of expression by the 3rd loosening signal of telecommunication, and transmit it to control unit 230.
Certainly, the detecting element of moving envelope detecting unit 250 also can be normal open switch.When this normal open switch was become flexible at this Feng Tiwei, its moving contact contacted with fixed contact under the compressing of envelope body, and normal open switch is in closure state; When this envelope body was become flexible, the moving contact of normal open switch separated with fixed contact, and normal open switch just is in off-state, thereby produced this envelope body of expression by the 3rd loosening signal of telecommunication, and transmitted it to control unit 230.
See also Fig. 2, power subsystem comprises capacitor C 1, C2, resistance R 1, R2, R3, diode D1, D2, D3, D4, triode T1, T2.Wherein, after capacitor C 1 step-down, obtain direct voltage through diode D1-D4 bridge rectifier again, from the voltage of live wire A and zero line N then through capacitor C 2 filtering.Filtered direct voltage is after sample resistance R2 and R3, triode T1 and T2 voltage stabilizing, and the output galvanic current is pressed to current detecting unit 220, control unit 230 and performance element 240.
The current balance type detecting element comprises zero sequence current mutual inductor CT1, and it is enclosed within on live wire A and the zero line N.When between the electric current of the electric current of live wire A and zero line N during disequilibrium, this zero sequence current mutual inductor CT1 induces the correspondent voltage signal, and transmits it to the in-phase input end of comparator IC1.The inverting input input of this comparator IC1 has first reference voltage value of being determined by resistance R 6, and this first reference voltage value is according to actual needs that it can change set point by the resistance of adjusting divider resistance R4 and R6 and predefined.Comparator IC1 will compare from the voltage signal and first reference voltage value of zero sequence current mutual inductor CT1, when the voltage signal from zero sequence current mutual inductor is higher than first reference voltage value, the unbalanced high level signal of comparator IC1 output expression electric current, this high level signal is input to the base stage of triode T3 through diode D9 and resistance R 7, make triode T3 conducting, and triode T4 and T5 correspondingly end, so, the power line that these two executive components of relay J 1 and J2 disconnect live wire A simultaneously respectively is connected with the power line of zero line N and is connected, and promptly cuts off power supply.
The load current detecting element comprises load current instrument transformer CT2, and it is enclosed within on the live wire A.Corresponding to the electric current of the live wire A that flows through, this load current instrument transformer CT2 induces the correspondent voltage signal, and this voltage signal is transferred to the in-phase input end of comparator IC2.The inverting input input of this comparator IC2 has second reference voltage value of being determined by adjustable resistance R11, and this second reference voltage value is according to actual needs that it can change set point by the resistance of regulating adjustable resistance R11 and predefined.The comparator IC2 voltage signal and second reference voltage value of conceited live current transformer CT2 in the future compares, when the voltage signal from load current instrument transformer CT2 is higher than second reference voltage value, the excessive high level signal of comparator IC2 output expression load current, this high level signal is input to the base stage of triode T3 through diode D8 and resistance R 7, make triode T3 conducting, triode T4 and T5 correspondingly end, so, the power line that these two executive components of relay J 1 and J2 disconnect live wire A simultaneously respectively is connected with the power line of zero line N and is connected, and promptly cuts off supply of electric power.
Be appreciated that, the mode that control unit in the present embodiment adopts three triode connection to connect, this both can realize the T3 conducting when current anomaly, T4, T5 end, and are connected thereby make relay J 1 and J2 action be connected with the power line of zero line N with the power line that cuts off live wire A simultaneously; Again can electric current recover normal after, realize that T3 ends, T4, T5 conducting are connected thereby make relay J 1 and J2 action be connected with the power line of zero line N with the power line of the cut live wire A of automatic recovery, so just can remove the trouble of manual closing operation from.
See also Fig. 3, be the physical circuit figure of the electronics that adopted in first embodiment of the invention envelope.
Wherein, the circuit of power subsystem constitutes and operation principle is similar to power subsystem shown in Figure 2, does not repeat them here.
Moving envelope detecting unit comprises sensitive switch K, resistance 2R4,2R5,2R7,2R8, diode 2D5,2D6, comparator 2IC1.Wherein, resistance 2R7,2R8 are divider resistance, are reference voltage with the voltage of resistance 2R8, and this reference voltage is input to the inverting input of 2IC1.When sensitive switch K is disconnected, a point current potential raises, be input to the in-phase input end of comparator 2IC1 through diode 2D5, resistance 2R5, through with reference voltage relatively after, comparator 2IC1 output high potential (promptly, the 3rd signal of telecommunication) give control unit, simultaneously this high potential through diode 2D6, resistance 2R5 be input to comparator 2IC1 in-phase input end so that the circuit self-locking can't restore electricity thereby make this electronics seal pairing circuit.
Control unit comprises diode 2D7,2D8,2D9, resistance 2R6, triode 2T3,2T4,2T5 and 2T6.This control unit carries out following two kinds of controls: first kind, the executive component in the performance element is controlled, to cut off supply of electric power (that is, cutting off the live wire A of this electronics envelope institute corresponding circuits and/or the connection of zero line N); Second kind, the unit of warning in the performance element is controlled, make it send the information of warning, that is, the unit of warning of control execution unit by means of the carrier transmit circuit to control terminal (figure do not show) transmission of control signals to carry out long-range warning.
The unit of warning can comprise warning unit and/or alarm unit.Warn the unit according to the various operations of warning of control signal execution from control unit, for example, warn moving envelope personnel " not moving without authorization envelope " by various ways such as voice, literal, and/or report to the police so that remind the relevant personnel such as user/administrative staff " the moving envelope of people to be arranged " by various ways such as sound, light, electricity, literal, impel user/administrative staff etc. to take measures to stop moving envelope, thereby avoid loss.Therefore, warning that the present invention mentions both comprises in order to remind the relevant personnel's such as user/administrative staff warning, also comprises in order to warn moving envelope personnel's warning.
The executive component of performance element comprises relay 2J1,2J2.When the comparator 2IC1 output high potential in the moving envelope detecting unit, the triode 2T3 conducting of control unit, triode 2T4,2T5 end, relay 2J1, the 2J2 of performance element correspondingly disconnect, thereby this electronics seals the connection of pairing live wire A and/or zero line N and is disconnected, that is, cut off supply of electric power.
The partial circuit of the unit of warning of performance element comprises resistance 2R9～2R13, electric capacity 2C3～2C5, inductance 2L1,2L2, diode 2D10,2D11, LED, triode 2T6,2T7, crystal oscillator BC, code switch DIP, integrated circuit 2IC2,2IC3 etc.When the diode 2D8 of high potential in control unit of the comparator 2IC1 output in the moving envelope detecting unit imports the base stage of triode 2T6, the 2T6 conducting, make the signal of pin one 7 outputs of the integrated circuit 2IC2 in the performance element transfer to integrated circuit 2IC3 through resistance 2R11, the frequency signal of pin 6 outputs of integrated circuit 2IC3 transfers to the base stage of triode 2T7 through diode (LED) and resistance 2R13, triode 2T7 corresponding to this frequency conducting or by, coil 2L1 correspondingly switches on or cuts off the power supply, so induction coil 2L2 correspondingly outwards launches electrical signal of reaction, receive and carry out the operation of warning accordingly with terminal to be controlled.
As can be seen, in the unit of warning of Fig. 3, the circuit that sends the information of warning by various ways such as sound, light, electricity, literal is not shown, and this part circuit is known general knowledge for a person skilled in the art, does not repeat them here.
In the practical application, the course of work of the electronics envelope of present embodiment is: when envelope body 1 is become flexible, the sensitive switch K of moving envelope detecting unit disconnects, the anodal current potential of diode 2D5 raises, and the homophase input current potential of comparator 2IC1 raises, and is higher than reference voltage, this moment, comparator 2IC1 produced the 3rd signal of telecommunication, and transmitting it to control unit, relay 2J1, the 2J2 of performance element disconnect under the control of control unit, thereby realize cutting off the function of supply of electric power; Simultaneously, the unit of warning of performance element will be sent to remote control terminal from the control signal of control unit by the carrier transmit circuit and carry out long-range warning, and wait with the administrative staff that remind the control terminal place and take the corresponding protection measure, avoid loss.
Comparator 2IC1 in the present embodiment can adopt integrated circuit LM324, UA741, and integrated circuit 2IC2 can adopt PT2262, and integrated circuit 2IC3 can adopt CD4069.
See also Fig. 4, the circuit of the moving envelope detecting unit among Fig. 3 can be substituted by transistor switching circuit.X among Fig. 4, Y, Z point be connected with the corresponding X of moving envelope detecting unit, Y, Z point among Fig. 3 respectively can finish this alternative and realization identical functions, promptly, when envelope body 1 is become flexible, sensitive switch K disconnects, and the anodal current potential of diode DA raises, and makes the current potential of triode TA base stage raise, so triode TA conducting, correspondingly Z point current potential raises, and has so just produced the 3rd signal of telecommunication, and then by subsequent conditioning circuit the 3rd signal of telecommunication has been transferred to control unit.
Be applied to the mechanical structure of the electronics envelope in the first embodiment of the invention below with reference to Fig. 5 and Fig. 6 explanation.
See also Fig. 5, this electronics package is drawn together envelope body 1, envelope seat 2 and sensitive switch 3.Wherein, envelope body 1 is a screw rod, and sensitive switch 3 is a normal open switch.In the present embodiment, envelope seat 2 is fixed in by on the casing of for example electric quantity metering box of envelope object (figure does not show), and sensitive switch 3 is arranged at the bottom of envelope seat 2.Envelope body 1 passes the case lid (figure does not show) and the precession envelope seat 2 of electric quantity metering box, thereby case lid and casing are executed envelope, to prevent illegally to open this electric quantity metering box.Under the normal condition, the shell fragment 33 of sensitive switch 3 is pushed down in the lower end of envelope body 1, makes the moving contact 31 and fixed contact 32 closures of sensitive switch 3.At this moment, the electronics envelope does not produce expression envelope body 1 by the 3rd loosening signal of telecommunication.
See also Fig. 6, Fig. 6 and Fig. 5 similar, the two difference are sensitive switch 3 residing state differences: among Fig. 5, sensitive switch 3 is in closure state; Among Fig. 6, sensitive switch 3 is in off-state.As shown in Figure 6, envelope body 1 is by loosening, and the moving contact 31 of sensitive switch 3 separates with fixed contact 32.At this moment, the electronics envelope will produce the 3rd signal of telecommunication.
See also Fig. 7, be the theory diagram of the current anomaly protective circuit of second embodiment of the invention.Current anomaly protective circuit in the present embodiment comprises power subsystem 300, current detecting unit 310, control unit 320 and performance element 330.
Wherein, power subsystem 300 provides operating voltage for current detecting unit 310, control unit 320 and performance element 330.
Particularly, the current balance type detection sub-unit comprises: live wire current detection circuit 301, first signal amplification circuit 302, first signal isolation circuit 303, neutral line current testing circuit 311, secondary signal amplifying circuit 312, secondary signal buffer circuit 313 and current balance type be circuit 314 relatively.Live wire current detection circuit 301 detects the live wire electric current in the test line in real time, and output and this live wire electric current corresponding voltage signal to the first signal amplification circuit 302, to amplify; Voltage signal after amplifying is transferred to first signal isolation circuit 303, exports its isolation to current balance type relatively circuit 314 by first signal isolation circuit 303.Simultaneously, neutral line current testing circuit 311 detects the neutral line currents in the test lines in real time, and output and this neutral line current corresponding voltage signal are to secondary signal amplifying circuit 312, to amplify; Voltage signal after amplifying is transferred to secondary signal buffer circuit 313, exports its isolation to current balance type relatively circuit 314 by secondary signal buffer circuit 313.Current balance type comparison circuit 314 will be imported comparing corresponding to the voltage signal of live wire electric current with corresponding to the voltage signal of neutral line current wherein, as long as these two voltage signals are inconsistent, then the signal of telecommunication of the current unbalance of test line is represented in output, and transmits it to control unit 320.
The load current detection sub-unit comprises: live wire current detection circuit 301, first signal amplification circuit 302, first signal isolation circuit 303 and load current comparison circuit 304.Live wire current detection circuit 301 detects the live wire electric current in the test line in real time, and output and this live wire electric current corresponding voltage signal to the first signal amplification circuit 302, to amplify; Voltage signal after amplifying is transferred to first signal isolation circuit 303, exports its isolation to load current comparison circuit 304 by first signal isolation circuit 303.The voltage signal corresponding to the live wire electric current that load current comparison circuit 304 will be imported wherein compares with predetermined reference voltage signal, if corresponding to the voltage signal of live wire electric current greater than reference voltage signal, then the excessive signal of telecommunication of load of test line is represented in output, and transmits it to control unit 320.
Be similar to control unit 230 and performance element 240 among Fig. 1 as for the operation principle of control unit 320 and performance element 330, do not repeat them here.
In the present embodiment, the detecting element in the current balance type detection sub-unit is a pair of copper-manganese sheet that is provided with in pairs.Wherein, the first copper-manganese sheet and the second copper-manganese sheet are serially connected in the live wire of test line respectively and are serially connected in the zero line of test line.Corresponding to the electric current that flows through the copper-manganese sheet, the two ends of the first copper-manganese sheet produce first voltage difference, and the second copper-manganese sheet produces second voltage difference.
In the present embodiment, the detecting element in the load current detection sub-unit is the copper-manganese sheet, and it is serially connected in the live wire of test line.Corresponding to the live wire electric current that flows through this copper-manganese sheet, this copper-manganese sheet produces the correspondent voltage signal.
See also Fig. 8, be the physical circuit figure of the current anomaly protective circuit of second embodiment of the invention.Wherein, the live wire current measuring element of live wire current detection module comprises copper-manganese sheet 1R2; The current signal amplifier circuit of live wire current detection module comprises electric capacity 1C5,1C6,1C7, resistance 1R4,1R5,1R6,1R7 and integrated circuit 1IC5; The signal isolation circuit of live wire current detection module comprises IC3.
The neutral line current detecting element of neutral line current detection module comprises copper-manganese sheet 1R8; The current signal amplifier circuit of neutral line current detection module comprises 1C8,1C9,1C13, resistance 1R9,1R10,1R11,1R12 and integrated circuit 1IC6; The Signal Spacing of neutral line current detection module comprises 1IC4.
Current balance type comparison circuit comprises: integrated circuit 1IC3,1IC4,1IC7-1, resistance 1R14,1R16 and diode 1D8.
The load current comparison circuit comprises: integrated circuit 1IC7-2, resistance 1R21,1R22 and diode 1D9.
Control unit comprises resistance 1R15, triode 1V2,1V3 and diode 1D3.Performance element comprises relay 1J1.
Power subsystem comprises: the power circuit of the live wire current signal amplifier circuit of being made up of electric capacity 1C1,1C4, resistance 1R1, diode 1D1, voltage-stabiliser tube 1DW1 and integrated circuit 1IC1, the power circuit of the neutral line current signal amplification circuit of forming by electric capacity 1C2, resistance 1R3, diode 1D2, voltage-stabiliser tube 1DW2, integrated circuit 1IC8, and the power circuit of the control circuit of forming by piezo-resistance 1R21, resistance 1R13,1R17,1R18,1R19, electric capacity 1C3,1C11,1C12 and integrated circuit 1IC2.
The operation principle of the current anomaly protective circuit of present embodiment and process are: when the second copper-manganese sheet that electric current is represented by the first copper-manganese sheet represented by resistance 1R2 or by 1R8, it is poor that the two ends of the first copper-manganese sheet 1R2 or the second copper-manganese sheet 1R8 form correspondent voltage.The voltage difference (first voltage difference) at the first copper-manganese sheet 1R2 two ends isolates being transported to the in-phase input end that current balance type compares the comparator 1IC7-1 in the circuit again through the signal isolation circuit of live wire current detection module after the current signal amplifier circuit of live wire current detection module amplifies.The voltage difference (second voltage difference) at the second copper-manganese sheet 1R8 two ends isolates being transported to the inverting input that current balance type compares the comparator 1IC7-1 in the circuit again through the signal isolation circuit of neutral line current detection module after the current signal amplifier circuit of neutral line current detection module amplifies.Like this, come first voltage difference and second voltage difference are compared by comparator 1IC7-1.If live wire electric current by resistance 1R2 and the neutral line current imbalance by resistance 1R8, then first voltage difference and second voltage difference are unequal, and in this case, the current balance type relatively comparator 1IC7-1 in the circuit will be exported high potential.This high potential is input to the base stage of triode 1V2 through diode 1D8,1R15, so, triode 1V2 conducting, triode 1V3 correspondingly ends, thereby makes relay 1J1 action, supplies with deenergization.And when live wire electric current and neutral line current restored balance, comparator 1IC7-1 did not export high potential, so triode 1V2 is by, correspondingly conducting of triode 1V3, thereby make relay 1J1 action, the power line that has been disconnected with automatic recovery connects, and promptly recovers power supply and supplies with.
In addition, the voltage difference at the first copper-manganese sheet 1R2 two ends is after the current signal amplifier circuit of live wire current detection module amplifies, isolate the in-phase input end that is transported to the comparator 1IC7-2 in the load current comparison circuit through the signal isolation circuit of live wire current detection module again, the inverting input input of comparator 1IC7-2 has reference voltage value.When by the detected load current of the first copper-manganese sheet 1R2 during greater than the reference voltage value that presets, the comparator 1IC7-2 output high potential in the load current comparison circuit.This high potential is through diode 1D9, resistance 1R15 and be input to the base stage of triode 1V2, so, triode 1V2 conducting, triode 1V3 correspondingly ends, thereby makes relay 1J1 action, supplies with deenergization.And when the live wire electric current recovers just often, comparator 1IC7-2 does not export high potential, then triode 1V2 by, correspondingly conducting of triode 1V3, thereby make relay 1J1 action, the power line that has been disconnected with automatic recovery connects, and promptly recovers power supply and supplies with.
Be understandable that above execution mode only is the illustrative embodiments that adopts for principle of the present invention is described, yet the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement also are considered as protection scope of the present invention.
Claims (9)
1. current anomaly protective circuit is characterized in that comprising: power subsystem, current detecting unit, control unit and performance element, wherein
Described power subsystem is used to described current detecting unit, control unit and performance element that operating voltage is provided;
Described current detecting unit comprises the current balance type detection sub-unit, be used for detecting disequilibrium between the live wire electric current of test line and the neutral line current, the current balance type detection sub-unit comprises the copper-manganese sheet and first comparator of paired setting, the first copper-manganese sheet in a pair of copper-manganese sheet of described paired setting and the second copper-manganese sheet are serially connected in the live wire of test line respectively and are serially connected in the zero line of test line, corresponding to the electric current that flows through described copper-manganese sheet, the two ends of the described first copper-manganese sheet produce first voltage difference, the described second copper-manganese sheet produces second voltage difference, described first voltage difference and second voltage difference are through after amplifying, isolate in-phase input end and the inverting input that transfers to described first comparator by the signal isolation circuit that comprises light-emitting diode and phototriode of correspondence respectively again, and when described first voltage difference and second voltage difference are unequal, described first comparator will represent that unbalanced high level signal transfers to described control unit between live wire electric current and the neutral line current;
Described control unit produces control signal corresponding according to the signal of telecommunication from described current detecting unit, and described control signal is transferred to performance element;
Described performance element moves according to described control signal, connects with the power line that cuts off the place circuit.
2. current anomaly protective circuit as claimed in claim 1; it is characterized in that: described current detecting unit also comprises the load current detection sub-unit; when the load current in the test line surpasses threshold value; described load current detection sub-unit just produces the corresponding with it signal of telecommunication, and transmits it to described control unit.
3. current anomaly protective circuit as claimed in claim 2 is characterized in that: described load current detection sub-unit comprises the load current detecting element and second comparator, and described load current detecting element comprises the first copper-manganese sheet,
The described first copper-manganese sheet is serially connected in the live wire of test line, corresponding to the live wire electric current that flows through the described first copper-manganese sheet, the described first copper-manganese sheet produces the correspondent voltage signal, and transmit it to the in-phase input end of described second comparator, described second comparator compares described voltage signal and the second predetermined reference voltage value that is input to its inverting input, when the voltage signal from the described first copper-manganese sheet is higher than described second reference voltage value, described second comparator will represent that the excessive high level signal of load transfers to described control unit.
4. current anomaly protective circuit as claimed in claim 3 is characterized in that: according to actual needs, described second reference voltage value is adjustable.
5. current anomaly protective circuit as claimed in claim 2, it is characterized in that also comprising the moving envelope detecting unit of electronics envelope, whether it is used to detect the envelope body of described electronics envelope by loosening, if detect described envelope body by loosening, just produce the described envelope body of expression by the loosening signal of telecommunication, and transmit it to described control unit;
Described control unit produces control signal corresponding according to the signal of telecommunication that seals detecting unit automatically, and described control signal is transferred to described performance element;
Described performance element moves according to described control signal, connects with the power line that cuts off the place circuit.
6. current anomaly protective circuit as claimed in claim 5 is characterized in that: described moving envelope detecting unit comprises pressure sensor,
Described pressure sensor detects the pressure during less than set point that comes self-styled body, just produces the described envelope body of expression by the loosening moving envelope signal of telecommunication, and transmits it to control unit.
7. current anomaly protective circuit as claimed in claim 5, it is characterized in that: described moving envelope detecting unit comprises normal open switch, when wherein said normal open switch was become flexible at described Feng Tiwei, its moving contact contacted with fixed contact under the compressing of envelope body, and normal open switch is in closure state; When described envelope body was become flexible, described moving contact separated with fixed contact, and normal open switch is in off-state, just produced the described envelope body of expression by the loosening moving envelope signal of telecommunication, and transmitted it to control unit.
8. current anomaly protective circuit as claimed in claim 2 is characterized in that: the executive component of described performance element is a relay.
9. current anomaly protective circuit as claimed in claim 8, it is characterized in that: described control unit comprises the triode that is at least two-stage cascade, when current anomaly, the conducting of first order triode, second level triode ends, and makes the described actuating of relay connect with the power line that cuts off the place circuit; Electric current recover normal after, first order triode ends, second level triode conducting makes described relay auto-closing and the power line that recovers the place circuit connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100970192A CN101060242B (en) | 2006-04-18 | 2007-04-18 | Current anomaly protective circuit |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610018814 | 2006-04-18 | ||
| CN200610018814.3 | 2006-04-18 | ||
| CN2007100970192A CN101060242B (en) | 2006-04-18 | 2007-04-18 | Current anomaly protective circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101060242A CN101060242A (en) | 2007-10-24 |
| CN101060242B true CN101060242B (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007100970192A Expired - Fee Related CN101060242B (en) | 2006-04-18 | 2007-04-18 | Current anomaly protective circuit |
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| CN (1) | CN101060242B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101477927B (en) * | 2008-01-04 | 2012-01-04 | 湖北盛佳电器设备有限公司 | Electricity exception protection circuit applied to circuit breaker |
| CN102590597A (en) * | 2011-11-29 | 2012-07-18 | 深圳市金立通信设备有限公司 | Circuit and method for detecting abnormal current of mobile phone |
| CN102638024B (en) * | 2012-04-16 | 2015-08-26 | 北京航天发射技术研究所 | Interruption line protector |
| CN103837806A (en) * | 2012-11-21 | 2014-06-04 | 赵元雷 | Insulation degree monitoring alarm device of electric automobile high voltage power supply system |
| CN105702491A (en) * | 2014-11-26 | 2016-06-22 | 中国科学院沈阳自动化研究所 | Limit switch applicable to strong magnetic environments for underwater robots |
| CN105514959A (en) * | 2015-11-30 | 2016-04-20 | 江苏茶花电气股份有限公司 | Switching value current sensor |
| CN106410743B (en) * | 2016-11-22 | 2019-06-18 | 海信(广东)厨卫系统有限公司 | A kind of power sense circuit and electronic product |
| CN106711923B (en) * | 2017-02-17 | 2018-06-19 | 中领世能（天津）科技有限公司 | Isolating and protecting device and electric power system |
| US11251729B2 (en) | 2018-07-02 | 2022-02-15 | Infinno Technology Corp. | Device and method for over-current protection |
| CN112290685B (en) * | 2020-11-12 | 2022-05-20 | 杭州凯达电力建设有限公司自动化运维分公司 | Electric energy management integrated monitoring system |
| EP4240113A1 (en) * | 2022-01-21 | 2023-09-06 | Shenzhen Hontech-Wins Electronics Co., Ltd. | Novel short circuit protection brct clamping and absorption circuit |
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| CN101060242A (en) | 2007-10-24 |
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