CN101237136B - Intelligent over-current protection method - Google Patents
Intelligent over-current protection method Download PDFInfo
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- CN101237136B CN101237136B CN2007100102306A CN200710010230A CN101237136B CN 101237136 B CN101237136 B CN 101237136B CN 2007100102306 A CN2007100102306 A CN 2007100102306A CN 200710010230 A CN200710010230 A CN 200710010230A CN 101237136 B CN101237136 B CN 101237136B
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Abstract
The invention relates to an intelligent overcurrent protection method which is characterized in that the intelligent overcurrent protection method can realize the control of the overcurrent protection on the circuit through a circuit under the time-sharing period and different current amplitudes; the circuit comprises a long time-delay control circuit (1) and a short time-delay control circuit (2). When current in the circuit reaches in a certain scope above a rated current, the circuit is cut off by delaying a certain time and realized through the long time-delay control circuit (1); when the current in the circuit reaches a certain definite value above the rated current, the circuit is cut off by delaying another fixed time and realized through the short time-delay control circuit (2). The intelligent overcurrent protection method can carry out accurate control, has good reliability, can realize the control of the overcurrent protection on the circuit under the time-sharing period and different current amplitudes and overcome the disadvantages of the simple control of the prior protection method.
Description
Technical field
The present invention relates to circuit control field, a kind of intelligent over-current protection method is provided especially.
Background technology
Overcurrent protection is the material particular of electric power system, because load circuit makes the circuit main circuit current strengthen unusually, the power-supplying circuit link is damaged.Surge appears in power-supplying circuit, causes that overload will damage the electricity consumption link, thus for fear of occur because of power supply or electricity consumption link break down cause large tracts of land to damage that overcurrent protection between power supply and load become must means.The simplest method is direct protection (adding the Fuse Type fuse) and indirect protection (add control circuit, cut off the electricity supply by conversion and control and realize protection).This is the means that most of electric equipments are taked.But this protection is disposable, needs to change fusible link.Indoor in the residential houses, earth leakage protective is adopted in power supply, and electric leakage exceeds standard and protects to equipment.In direct current supply, adopt the bimetallic protection switch that overcurrent is controlled or the like.
The above guard method control is simple, but general low, the poor reliability of protective circuit control precision.To accurately control, and only control with the different electric current width of cloth at times and still can not satisfy the demand with said method.
Summary of the invention
The objective of the invention is with the different electric current width of cloth overcurrent protection of circuit to be controlled at times in order to realize.A kind of intelligent over-current protection method is provided, has it is characterized in that: described intelligent over-current protection method can be realized at times and the control of circuit being carried out overcurrent protection under the different electric current width of cloth.
When described intelligent over-current protection method can realize in the circuit that electric current reaches on the rated current within the certain limit, the time-delay certain hour disconnected circuit, realizes by long delay control circuit 1; And can be implemented in electric current in the circuit simultaneously and reach certain and exceed the certain value of rated current the time, another set time of delaying time disconnects circuit, realizes by short time delay control circuit 2.
Also comprise switch 3 in the circuit of described intelligent over-current protection method, sample resistance 4, load 5, triode 6, the actuator 7 of open circuit;
Wherein: switch 3 one ends link to each other with power supply, the other end links to each other with sample resistance 4, sample resistance 4 links to each other with an end of long delay control circuit 1, short time delay control circuit 2 and load 5 respectively, the other end of load 5 links to each other with ground wire, long delay control circuit 1, short time delay control circuit 2 link to each other with the base stage of triode 6 simultaneously, the emitter of triode 6 links to each other with ground wire, and collector electrode links to each other with actuator 7, and the other end of actuator 7 links to each other with switch 3.
Described long delay control circuit 1 comprises first amplifier 101, earth resistance 1, and first threshold circuit 103, trigger 1 is with door 105, the first diodes 106, time delay resistance, electric capacity;
Wherein: comprise that first amplifier 101 is connected with sample resistance 4, earth resistance 1, first threshold circuit 103 respectively, earth resistance 1 is connected with ground wire, first threshold circuit 103 simultaneously with trigger 1 be connected with door 105, trigger 1 is with linking to each other with door 105, and link to each other with time delay resistance, electric capacity one end links to each other with time delay resistance, and the other end links to each other with ground wire, with door 105 and 106 anodal linking to each other of first diode, first diode, 106 negative poles link to each other with the base stage of triode 6.
Described short time delay control circuit 2 comprises second amplifier 201, earth resistance 2 202, second threshold circuit 203, trigger 2 204, second diode 205;
Wherein: comprise that second amplifier 201 is connected with sample resistance 4, earth resistance 2 202, second threshold circuit 203 respectively, earth resistance 2 202 is connected with ground wire, second threshold circuit 203 is connected with trigger 2 204, trigger 2 204 and 205 anodal linking to each other of second diode, second diode, 205 negative poles link to each other with the base stage of triode 6.
The actuator 7 of described open circuit is an electromagnet.
The operation principle of system:
Sampling amplification circuit: in power supply and load circuit, seal in the very little resistance of resistance for example 0.1 Ω or 0.01 Ω full figure in current conversion become voltage drop, the variation of voltage drop has reflected the situation of change of power supply or load current, and voltage is sent into current amplifier I
C1, I
C2Precision current amplifier for texas,U.S company.After the pressure drop amplification with sample resistance, send into threshold circuit.Because the high common-mode rejection ratio 100DB of current-amplifying appliance adds input sample resistance and incorporates amplifier in into extremely low impedance, makes interference signal can't enter amplifier, has guaranteed certainty of measurement and stability.Amplifier magnification ratio is 100 times, and load current is 10A when sample resistance is 0.01 Ω, and amplifier out voltage is 10V, and the load capacity of amplifier is 8～14mA, enough is used to drive threshold circuit.
Threshold circuit: threshold circuit is selected to start to control a little to be provided with for trigger.For example load circuit 10A is set is the upscale protection value greater than 10A for example 10.1A will cut off the electricity supply immediately to realize protection; the threshold circuit main task is that amplitude is differentiated; because feed the signal of threshold circuit and be the current amplitude of representing load circuit, the precision of discriminating is exactly the control precision of this circuit
Trigger: flip-flop circuit is the change over switch usefulness as control, before circuit enters protection.Trigger does not overturn, and avoids interference the influence of signal to control reliability.
Though big but the weak point of holding time inserted the RC delay circuit circuit delay is started less than 1 second or several seconds amplitudes for instantaneous big pulse.When normal connection is still kept in big pulse later circuit, if surpass set thresholding should protection the time for example the 11A duration greater than set time of delay circuit start by with door for drive circuit works, and make electromagnet drive master switch K to disconnect.
With door is to be the locking to the discriminator circuit output signal, and when surpassing the setting protective current, electric current one tunnel enters and door through trigger, and another road directly enters and door.When through postponing and confirming to surpass set point,, fully overcome misoperation with door output control signal.
Advantage of the present invention:
Described intelligent over-current protection method can accurately be controlled, and good reliability can realize at times and the control of circuit being carried out overcurrent protection under the different electric current width of cloth.
Description of drawings
The present invention is further detailed explanation below in conjunction with drawings and the embodiments.
Fig. 1 is circuit principle structure figure.
Embodiment
The described intelligent over-current protection method of present embodiment is characterized in that: described intelligent over-current protection method can be realized at times and the control of circuit being carried out overcurrent protection under the different electric current width of cloth
Described intelligent over-current protection method can realize that electric current reaches 3 amperes of rated current in the circuit, on 6.1 amperes to 15 ampere-hours, delaying time made circuit disconnect in 6 seconds, realized by long delay control circuit 1; And can be implemented in the circuit electric current simultaneously and surpass 15 ampere-hours, delay time made circuit disconnect in 1 second, by 2 realizations of short time delay control circuit.
Also comprise switch 3 in the circuit of described intelligent over-current protection method, sample resistance 4, load 5, triode 6, the actuator 7 of open circuit;
Wherein: switch 3 one ends link to each other with power supply, the other end links to each other with sample resistance 4, sample resistance 4 links to each other with an end of long delay control circuit 1, short time delay control circuit 2 and load 5 respectively, the other end of load 5 links to each other with ground wire, long delay control circuit 1, short time delay control circuit 2 link to each other with the base stage of triode 6 simultaneously, the emitter of triode 6 links to each other with ground wire, and collector electrode links to each other with actuator 7, and the other end of actuator 7 links to each other with switch 3.
Described long delay control circuit 1 comprises first amplifier 101, earth resistance 1, and first threshold circuit 103, trigger 1 is with door 105, the first diodes 106, time delay resistance, electric capacity;
Wherein: comprise that first amplifier 101 is connected with sample resistance 4, earth resistance 1, first threshold circuit 103 respectively, earth resistance 1 is connected with ground wire, first threshold circuit 103 simultaneously with trigger 1 be connected with door 105, trigger 1 is with linking to each other with door 105, and link to each other with time delay resistance, electric capacity one end links to each other with time delay resistance, and the other end links to each other with ground wire, with door 105 and 106 anodal linking to each other of first diode, first diode, 106 negative poles link to each other with the base stage of triode 6.
Described short time delay control circuit 2 comprises second amplifier 201, earth resistance 2 202, second threshold circuit 203, trigger 2 204, second diode 205;
Wherein: comprise that second amplifier 201 is connected with sample resistance 4, earth resistance 2 202, second threshold circuit 203 respectively, earth resistance 2 202 is connected with ground wire, second threshold circuit 203 is connected with trigger 2 204, trigger 2 204 and 205 anodal linking to each other of second diode, second diode, 205 negative poles link to each other with the base stage of triode 6.
Described first amplifier 101 and second amplifier 201 adopt is that the SMD model of precision current amplifier of texas,U.S company is 169.
The actuator 7 of described open circuit is an electromagnet.
The operation principle of system:
Sampling amplification circuit: in power supply and load circuit, seal in very little resistance 0.01 Ω of resistance full figure in current conversion become voltage drop, the variation of voltage drop has reflected the situation of change of power supply or load current, and voltage is sent into current amplifier I
C1, I
C2Precision current amplifier for texas,U.S company.After the pressure drop amplification with sample resistance, send into threshold circuit.Because the high common-mode rejection ratio 100DB of current-amplifying appliance adds input sample resistance and incorporates amplifier in into extremely low impedance, makes interference signal can't enter amplifier, has guaranteed certainty of measurement and stability.Amplifier magnification ratio is 100 times, and load current is 10A when sample resistance is 0.01 Ω, and amplifier out voltage is 10V, and the load capacity of amplifier is 8～14mA, enough is used to drive threshold circuit.
Threshold circuit: threshold circuit is selected to start to control a little to be provided with for trigger.For example load circuit 10A is set is the upscale protection value greater than 10A for example 10.1A will cut off the electricity supply immediately to realize protection; the threshold circuit main task is that amplitude is differentiated; because feed the signal of threshold circuit and be the current amplitude of representing load circuit, the precision of discriminating is exactly the control precision of this circuit
Trigger: flip-flop circuit is the change over switch usefulness as control, before circuit enters protection.Trigger does not overturn, and avoids interference the influence of signal to control reliability.
Though big but the weak point of holding time inserted the RC delay circuit circuit delay is started less than 1 second amplitude for instantaneous big pulse.When normal connection is still kept in big pulse later circuit, if surpass set thresholding should protection the time for example the 11A duration greater than set time of delay circuit start by with door for drive circuit works, and make electromagnet drive master switch K to disconnect.
With door is to be the locking to the discriminator circuit output signal, and when surpassing the setting protective current, electric current one tunnel enters and door through trigger, and another road directly enters and door.When through postponing and confirming to surpass set point,, fully overcome misoperation with door output control signal.
The described intelligent over-current protection method of present embodiment is characterized in that: described intelligent over-current protection method can be realized at times and the control of circuit being carried out overcurrent protection under the different electric current width of cloth
Described intelligent over-current protection method can realize that electric current reaches 3 amperes of rated current in the circuit, on 6.1 amperes to 20 ampere-hours, delaying time made circuit disconnect in 8 seconds, realized by long delay control circuit 1; And can be implemented in the circuit electric current simultaneously and surpass 20 ampere-hours, delay time made circuit disconnect in 1 second, by 2 realizations of short time delay control circuit.
Also comprise switch 3 in the circuit of described intelligent over-current protection method, sample resistance 4 is 0.1 Ω, load 5, triode 6, the actuator 7 of open circuit;
Wherein: switch 3 one ends link to each other with power supply, the other end links to each other with sample resistance 4, sample resistance 4 links to each other with an end of long delay control circuit 1, short time delay control circuit 2 and load 5 respectively, the other end of load 5 links to each other with ground wire, long delay control circuit 1, short time delay control circuit 2 link to each other with the base stage of triode 6 simultaneously, the emitter of triode 6 links to each other with ground wire, and collector electrode links to each other with actuator 7, and the other end of actuator 7 links to each other with switch 3.
Described long delay control circuit 1 comprises first amplifier 101, earth resistance 1, and first threshold circuit 103, trigger 1 is with door 105, the first diodes 106, time delay resistance, electric capacity;
Wherein: comprise that first amplifier 101 is connected with sample resistance 4, earth resistance 1, first threshold circuit 103 respectively, earth resistance 1 is connected with ground wire, first threshold circuit 103 simultaneously with trigger 1 be connected with door 105, trigger 1 is with linking to each other with door 105, and link to each other with time delay resistance, electric capacity one end links to each other with time delay resistance, and the other end links to each other with ground wire, with door 105 and 106 anodal linking to each other of first diode, first diode, 106 negative poles link to each other with the base stage of triode 6.
Described short time delay control circuit 2 comprises second amplifier 201, earth resistance 2 202, second threshold circuit 203, trigger 2 204, second diode 205;
Wherein: comprise that second amplifier 201 is connected with sample resistance 4, earth resistance 2 202, second threshold circuit 203 respectively, earth resistance 2 202 is connected with ground wire, second threshold circuit 203 is connected with trigger 2 204, trigger 2 204 and 205 anodal linking to each other of second diode, second diode, 205 negative poles link to each other with the base stage of triode 6.
Described first amplifier 101 and second amplifier 201 adopt is that the SMD model of precision current amplifier of texas,U.S company is 169.
The actuator 7 of described open circuit is an electromagnet.
The described intelligent over-current protection method of present embodiment is characterized in that: described intelligent over-current protection method can be realized at times and the control of circuit being carried out overcurrent protection under the different electric current width of cloth
Described intelligent over-current protection method can realize that electric current reaches 3 amperes of rated current in the circuit, on 6.1 amperes to 15 ampere-hours, delaying time made circuit disconnect in 8 seconds, realized by long delay control circuit 1; And can be implemented in the circuit electric current simultaneously and surpass 15 ampere-hours, delay time made circuit disconnect in 1 second, by 2 realizations of short time delay control circuit.
Comprise long delay control circuit 1 in the circuit of described intelligent over-current protection method, short time delay control circuit 2, switch 3, sample resistance 4 is 0.01 Ω, load 5, triode 6, the actuator 7 of open circuit;
Wherein: switch 3 one ends link to each other with power supply, the other end links to each other with sample resistance 4, sample resistance 4 links to each other with an end of long delay control circuit 1, short time delay control circuit 2 and load 5 respectively, the other end of load 5 links to each other with ground wire, long delay control circuit 1, short time delay control circuit 2 link to each other with the base stage of triode 6 simultaneously, the emitter of triode 6 links to each other with ground wire, and collector electrode links to each other with actuator 7, and the other end of actuator 7 links to each other with switch 3.
Described long delay control circuit 1 comprises first amplifier 101, earth resistance 1, and first threshold circuit 103, trigger 1 is with door 105, the first diodes 106, time delay resistance, electric capacity;
Wherein: comprise that first amplifier 101 is connected with sample resistance 4, earth resistance 1, first threshold circuit 103 respectively, earth resistance 1 is connected with ground wire, first threshold circuit 103 simultaneously with trigger 1 be connected with door 105, trigger 1 is with linking to each other with door 105, and link to each other with time delay resistance, electric capacity one end links to each other with time delay resistance, and the other end links to each other with ground wire, with door 105 and 106 anodal linking to each other of first diode, first diode, 106 negative poles link to each other with the base stage of triode 6.
Described short time delay control circuit 2 comprises second amplifier 201, earth resistance 2 202, second threshold circuit 203, trigger 2 204, second diode 205;
Wherein: comprise that second amplifier 201 is connected with sample resistance 4, earth resistance 2 202, second threshold circuit 203 respectively, earth resistance 2 202 is connected with ground wire, second threshold circuit 203 is connected with trigger 2 204, trigger 2 204 and 205 anodal linking to each other of second diode, second diode, 205 negative poles link to each other with the base stage of triode 6.
Described first amplifier 101 and second amplifier 201 adopt is that the SMD model of precision current amplifier of texas,U.S company is 165.
The actuator 7 of described open circuit is an electromagnet.
Claims (4)
1. intelligent over-current protection method can be realized at times and the control of circuit being carried out overcurrent protection under different current amplitudes by circuit, can realize that the described circuit of described method comprises long delay control circuit (1) and short time delay control circuit (2); When intelligent over-current protection method can realize in the circuit that electric current reaches on the rated current within the certain limit, the time-delay certain hour disconnected circuit, realizes by long delay control circuit (1); And can be implemented in electric current in the circuit simultaneously and reach certain and exceed the certain value of rated current the time, another set time of delaying time disconnects circuit, realizes by short time delay control circuit (2); The actuator (7) that also comprises switch (3), sample resistance (4), load (5), triode (6) and open circuit in the described circuit of the described method of energy realization;
Wherein: switch (3) one ends link to each other with power supply, the other end links to each other with sample resistance (4), sample resistance (4) links to each other with long delay control circuit (1), short time delay control circuit (2) and an end of load (5) respectively, the other end of load (5) links to each other with ground wire, long delay control circuit (1), short time delay control circuit (2) link to each other with the base stage of triode (6) simultaneously, the emitter of triode (6) links to each other with ground wire, collector electrode links to each other with an end of the actuator (7) of open circuit, and the other end of the actuator of open circuit (7) links to each other with switch (3).
2. according to the described intelligent over-current protection method of claim 2, it is characterized in that: described long delay control circuit (1) comprises first amplifier (101), earth resistance one (102), first threshold circuit (103), trigger one (104), with door (105), first diode (106), time delay resistance and electric capacity;
Wherein: first amplifier (101) is connected with sample resistance (4), earth resistance one (102), first threshold circuit (103) respectively, earth resistance one (102) is connected with ground wire, first threshold circuit (103) simultaneously with trigger one (104) be connected with door (105), trigger one (104) is with linking to each other with door (105), and link to each other with time delay resistance, electric capacity one end links to each other with time delay resistance, the other end links to each other with ground wire, link to each other with door (105) and first diode (106) are anodal, first diode (106) negative pole links to each other with the base stage of triode (6).
3. according to the described intelligent over-current protection method of claim 1, it is characterized in that: described short time delay control circuit (2) comprises second amplifier (201), earth resistance two (202), second threshold circuit (203), the trigger two (204) and second diode (205);
Wherein: second amplifier (201) is connected with sample resistance (4), earth resistance two (202), second threshold circuit (203) respectively, earth resistance two (202) is connected with ground wire, second threshold circuit (203) is connected with trigger two (204), trigger two (204) links to each other with second diode (205) is anodal, and second diode (205) negative pole links to each other with the base stage of triode (6).
4. according to the described intelligent over-current protection method of claim 2, it is characterized in that: the actuator of described open circuit (7) is electromagnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100102306A CN101237136B (en) | 2007-01-31 | 2007-01-31 | Intelligent over-current protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100102306A CN101237136B (en) | 2007-01-31 | 2007-01-31 | Intelligent over-current protection method |
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| Publication Number | Publication Date |
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| CN101237136A CN101237136A (en) | 2008-08-06 |
| CN101237136B true CN101237136B (en) | 2011-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007100102306A Expired - Fee Related CN101237136B (en) | 2007-01-31 | 2007-01-31 | Intelligent over-current protection method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522725B (en) * | 2011-12-21 | 2014-12-10 | 北京自动测试技术研究所 | Intelligent overcurrent protection circuit for integrated circuit test system |
| CN106712199B (en) * | 2017-01-22 | 2023-12-29 | 湖南电将军新能源有限公司 | Overcurrent protection circuit and method for automobile starting power supply |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4266259A (en) * | 1979-09-04 | 1981-05-05 | General Electric Company | Long-time and short-time overcurrent signal processor for circuit breaker static trip units |
| US4571659A (en) * | 1982-07-12 | 1986-02-18 | Merlin Gerin | Static overcurrent trip device to operate a circuit breaker in response of fault conditions in an alternating current net system |
| US4717985A (en) * | 1985-02-25 | 1988-01-05 | Merlin Gerin S.A. | Circuit breaker with digitized solid-state trip unit with inverse time tripping function |
| CN1419727A (en) * | 2000-06-28 | 2003-05-21 | 西门子公司 | Electronic overload trip for a low-voltage circuit breaker |
-
2007
- 2007-01-31 CN CN2007100102306A patent/CN101237136B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4266259A (en) * | 1979-09-04 | 1981-05-05 | General Electric Company | Long-time and short-time overcurrent signal processor for circuit breaker static trip units |
| US4571659A (en) * | 1982-07-12 | 1986-02-18 | Merlin Gerin | Static overcurrent trip device to operate a circuit breaker in response of fault conditions in an alternating current net system |
| US4717985A (en) * | 1985-02-25 | 1988-01-05 | Merlin Gerin S.A. | Circuit breaker with digitized solid-state trip unit with inverse time tripping function |
| CN1419727A (en) * | 2000-06-28 | 2003-05-21 | 西门子公司 | Electronic overload trip for a low-voltage circuit breaker |
Non-Patent Citations (2)
| Title |
|---|
| US 4717985 A,全文. |
| 全文. |
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