CN103346553A - Reverse-connection-resisting and relay-coil-short-circuit-resisting control circuit of electronic controller - Google Patents
Reverse-connection-resisting and relay-coil-short-circuit-resisting control circuit of electronic controller Download PDFInfo
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- CN103346553A CN103346553A CN2013102859782A CN201310285978A CN103346553A CN 103346553 A CN103346553 A CN 103346553A CN 2013102859782 A CN2013102859782 A CN 2013102859782A CN 201310285978 A CN201310285978 A CN 201310285978A CN 103346553 A CN103346553 A CN 103346553A
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Abstract
The invention provides a reverse-connection-resisting and relay-coil-short-circuit-resisting control circuit of an electronic controller. The reverse-connection-resisting and relay-coil-short-circuit-resisting control circuit comprises a power source, a relay, a driving circuit, a switch, a protection diode, a protection capacitor, a divider resistor and a protection resistor. The problem that a fuse can be burnt when multiple power sources are in reverse connection at present so that the replacement of the fuse wastes time and labor is solved, and the reverse-connection-resisting and relay-coil-short-circuit-resisting control circuit is suitable for equipment with the high power and equipment with the low power. Meanwhile, the reverse-connection-resisting and relay-coil-short-circuit-resisting control circuit has the delayed outage function, data when the control circuit or rear-end equipment works can be stored, and the data losses can be prevented. Meanwhile, damage to the control circuit or the rear-end equipment due to the fact that a relay coil is in a short circuit can be effectively prevented, and the control circuit or the rear-end equipment can be effectively protected.
Description
Technical field
The present invention relates to the electronic controller field, particularly anti-reverse the and anti-relay coil short-circuit control circuit of a kind of electronic controller.
Background technology
In the environment for use of DC power supply, the user may not connect power positive cathode anti-when not noting in operation, causes control circuit or rear end equipment to be burnt.And major part prevents that the guard method of this type of problem from being blown fuse at present, namely when the power supply reversal connection, blown fuse, protection control circuit or rear end equipment are not damaged, waste time and energy but change fuse, cause control circuit or rear end equipment not to be worked after the blown fuse simultaneously, need the cost resource to go for the place of seeking the system failure, not only influence system's operation, also waste the great amount of manpower resource; Patent of invention (200620141245.7) discloses a kind of anti-power supply reversal connection circuit, uses diode to carry out anti-reverse protection, because there is forward voltage drop in diode, has power loss, only is applicable to low-power equipment.For relay itself; because uses that generation is for a long time worn out, in replacing or the debug process; exist the relay coil short circuit to take place; very easily cause the control circuit that involves great expense or rear end equipment to damage, but at present not at the method for after the relay coil short circuit control circuit or rear end equipment being protected.
Simultaneously, rear end equipment needs certain hour to preserve current operational data when outage, but present most of control circuit cuts off the power supply immediately at switch disconnection back control circuit or rear end equipment, important process data before the outage are lost immediately, can't preserve current operational data, cause unnecessary loss; And at present major part can realize waking up the control circuit with sleep mode, all there is certain loss in power supply, when power supply is powered battery, if control circuit or rear end equipment are in resting state for a long time, this loss may exhaust the energy content of battery, causes the outage of control circuit or rear end equipment.
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Summary of the invention
The technical problem that the present invention solves is, at the above-mentioned defective on the prior art, provides a kind of electronic controller anti-reverse and anti-relay coil short-circuit control circuit, and control circuit or rear end equipment are effectively protected, and high or low power all is fit to.
The technical solution adopted for the present invention to solve the technical problems is: constitute the anti-reverse and anti-relay coil short-circuit control circuit of a kind of electronic controller, comprise power supply, relay, drive circuit, switch, protection diode, protection electric capacity, divider resistance and current-limiting resistance, described power supply comprises positive source and power cathode; Described relay has coil anode, coil negative terminal, common port, normal-closed end and normal beginning; Described drive circuit is formed by driving triode, and described driving triode comprises that first drives triode and the second driving triode; Described protection diode comprises the first protection diode, the second protection diode, the 3rd protection diode, the 4th protection diode, the 5th protection diode, the 6th protection diode, the 7th protection diode, the 8th protection diode and the 9th protection diode; Described divider resistance comprises first divider resistance and second divider resistance; Described current-limiting resistance comprises first current-limiting resistance, second current-limiting resistance and the 3rd current-limiting resistance.
The positive port of described coil connects the negative pole of the 6th protection diode, the negative pole and second of the 4th protection diode drives the collector electrode of triode, and described coil negative terminal mouth connects positive pole and the power cathode of the 6th protection diode.
Described second drives the emitter of triode and an end of second divider resistance; the negative pole of the 9th protection diode; the negative pole of the 5th protection diode links to each other with protection electric capacity one end; the positive pole of the 9th protection diode links to each other with the Chang Kaiduan of relay; the protection electric capacity other end links to each other with the 5th protection diode cathode; the 5th protection diode cathode links to each other with the second protection diode, one end with first current-limiting resistance, one end; the first current-limiting resistance other end links to each other with switch one end with second current-limiting resistance, one end; the switch other end links to each other with positive source; the second current-limiting resistance other end links to each other with the 3rd protection diode cathode with the first protection diode cathode, and the first protection diode cathode links to each other with power cathode with the second protection diode other end.
Described second base stage that drives triode links to each other with an end of the second divider resistance other end and first divider resistance, the first divider resistance other end links to each other with first collector electrode that drives triode, and first emitter that drives triode links to each other with power cathode with resistance one end.
Described first base stage that drives triode links to each other with the 8th protection diode cathode; the 8th protection diode cathode connects the 7th protection diode cathode, the resistance other end, the 4th protection diode cathode and the 3rd protection diode cathode; the 7th protection diode cathode links to each other with the 3rd current-limiting resistance one end, and the 3rd current-limiting resistance other end links to each other with control end.
Described second protects diode and protects electric capacity, and the second protection diode is two-way transient peak absorption tube, and effect is to absorb instant high-voltage, protective circuit as if having surge and quick electric pulse group time.
The described first protection diode is the 4.7V voltage-stabiliser tube; if have surge or quick electric pulse group; though two-way transient peak absorption tube absorbs instant high-voltage; but still there is a very high voltage in the junction of first protective resistance and second protective resistance; this moment first the protection diode with its clamper about 4.7V, thereby protective circuit.
Described the 3rd protection diode; if during switch external parallel connection inductive load; moment in the switch outage produces negative voltage; the 8th diode cathode voltage can be dragged down; cause the first driving triode not worked; be that relay disconnects, the 3rd diode can prevent that this negative voltage from dragging down the 8th diode cathode voltage.
Described the 4th protection diode and the 8th protection diode; when acting on the relay coil short circuit; the 4th protection diode and the 8th protection diode drive transistor base with first and are clamped to 0V; make first to drive triode and the second driving triode shutoff, prevent from driving triode because the relay coil short circuit damages second.
Described the 5th the protection diode and the 9th the protection diode, its act as or relation, make relay before adhesive by power drives, power on the back driven by VBAT.
Described the 6th protection diode is the afterflow effect, prevents that the negative voltage that produces when relay disconnects from driving triode with second and puncturing.
Described the 7th protection diode, if effect is to prevent its anti-filling to control chip when having high voltage, causes control chip to damage.
Enforcement the invention has the beneficial effects as follows: prevent the power supply reversal connection, prevent the relay coil short circuit, the time-delay power down, can realize anti-short circuit and anti-reverse high-low level output function after simplifying circuit, can realize loss-free waking up and sleep mode, can satisfy voltage (peak value, open circuit): line/ground is 1 kV, line/line is the surge anti-interference test of 0.5 kV, and also can satisfy voltage peak (open circuit): power line is 2kV(line/ground) the impulse train duration: 15 ms; Electricity fast-pulse group immunity experiment.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is the circuit theory diagrams after the simplification of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is further specified, as shown in Figure 1:
RL is relay; Q1 is the first driving triode (NPN pipe), and Q2 is the second driving triode (PNP pipe); D1 is the first protection diode (4.7V voltage stabilizing didoe), D2 is the second protection diode (two-way transient peak absorption tube), D3 is the 3rd protection diode, D4 is the 4th protection diode, D5 is the 5th protection diode, and D6 is the 6th protection diode, and D7 is the 7th protection diode, D8 is the 8th protection diode, and D9 is the 9th protection diode; C1 is protection electric capacity (102/2KV); R1 is first current-limiting resistance (5), and R2 is second current-limiting resistance (1K), and R3 is the 3rd current-limiting resistance (1K), and R4 is first divider resistance (5.1K), and R5 is second divider resistance (10K); PTx is control signal; VBAT is the back-end circuit power supply.
Anti-reverse and the anti-relay coil short-circuit control circuit of electronic controller of the present invention does not have any when unusual, and circuit normally powers on, behind the switch closure, signal enters from switch, through R1, the D5 emitter to triode Q2, D3, D8 are passed through to the base stage of triode Q1 again through R2 and voltage-stabiliser tube D1 in another road of signal, make the conducting of Q1 triode, thereby the base stage of Q2 is low level, makes triode Q2 conducting, and electric current forms the loop, control relay adhesive, back-end circuit or device power.
Time-delay power down function of the present invention, when MCU detects switching signal and is low level, the control mouth of MCU produces the unlatching that high level signal is kept triode Q1, relay is powered by VBAT, electric current enters relay through D9, Q2, reach the purpose of delay cut-off, data during to control circuit or rear end equipment work are stored, prevent loss of data, can control by switch simultaneously and wake up and dormancy, because power unit did not have load to connect when switch disconnected, so there is not the loss phenomenon in power supply.
Relay coil short-circuit protection function of the present invention: when the relay coil short circuit; be that the RLY-ON current potential is when being 0V; can cause the positive electrode potential of D4 to be pulled to about 0.7V, so the Q1 base potential is 0V, Q1 manages shutoff; Q2 manages shutoff; Q2 can not damage by overcurrent, thus protection power supply and control circuit, and the benefit of this design is; when control chip is not worked, just can reach the effect of protection by circuit itself.
Anti-reverse function of the present invention, when power positive cathode connects inverse time, not adhesive of relay, positive source links to each other with the positive pole of D1, arrive ground through R2, and another road makes its nonpassage by D3 and D4, relay coil no current process, thereby not adhesive of relay guarantees that control circuit or rear end equipment are not damaged.
Be illustrated in figure 2 as the circuit theory diagrams after the anti-reverse and anti-relay coil short-circuit control circuit of electronic controller of the present invention is simplified.
Circuit after the present invention simplifies can be realized anti-short circuit and anti-reverse high-low level output function.When control pin PTx was high level, Q1 managed conducting, and the base stage of Q2 is that voltage drags down, and Q2 manages conducting, is output as VRLY.
Anti-short-circuit function: if output pin is ground, D3 is 0.7V just very, and the Q1 pipe turn-offs like this, and Q2 manages shutoff, thereby power supply can short circuit not cause power supply, control circuit or rear end equipment to be damaged.
Anti-reverse function: when the power supply reversal connection, owing to have D1 and D2, cause power supply and control pin obstructed, thereby the protection control chip does not damage.
The invention is not restricted to above-mentioned concrete application example, also be applicable to the occasion that other needs similar functions.
Claims (7)
1. the anti-reverse and anti-relay coil short-circuit control circuit of electronic controller comprises power supply, relay, drive circuit, switch, protection diode, protection electric capacity, divider resistance and current-limiting resistance, and described power supply comprises positive source and power cathode; Described relay has coil anode, coil negative terminal, common port, normal-closed end and normal beginning; Described drive circuit is formed by driving triode; Described driving triode comprises that first drives triode and the second driving triode; Described protection diode comprises the first protection diode, the second protection diode, the 3rd protection diode, the 4th protection diode, the 5th protection diode, the 6th protection diode, the 7th protection diode, the 8th protection diode and the 9th protection diode; Described divider resistance comprises first divider resistance and second divider resistance; Described current-limiting resistance comprises first current-limiting resistance, second current-limiting resistance and the 3rd current-limiting resistance; It is characterized in that:
The positive port of described coil connects the negative pole of the 6th protection diode, the negative pole and second of the 4th protection diode drives the collector electrode of triode, and described coil negative terminal mouth connects positive pole and the power cathode of the 6th protection diode;
Described second drives the emitter of triode and an end of second divider resistance, the negative pole of the 9th protection diode, the negative pole of the 5th protection diode links to each other with protection electric capacity one end, the positive pole of the 9th protection diode links to each other with the Chang Kaiduan of relay, the protection electric capacity other end links to each other with the 5th protection diode cathode, the 5th protection diode cathode links to each other with the second protection diode, one end with first current-limiting resistance, one end, the first current-limiting resistance other end links to each other with switch one end with second current-limiting resistance, one end, the switch other end links to each other with positive source, the second current-limiting resistance other end links to each other with the 3rd protection diode cathode with the first protection diode cathode, and the first protection diode cathode links to each other with power cathode with the second protection diode other end;
Described second base stage that drives triode links to each other with an end of the second divider resistance other end and first divider resistance, the first divider resistance other end links to each other with first collector electrode that drives triode, and first emitter that drives triode links to each other with power cathode with resistance one end;
Described first base stage that drives triode links to each other with the 8th protection diode cathode; the 8th protection diode cathode connects the 7th protection diode cathode, the resistance other end, the 4th protection diode cathode and the 3rd protection diode cathode; the 7th protection diode cathode links to each other with the 3rd current-limiting resistance one end, and the 3rd current-limiting resistance other end links to each other with control end.
2. the anti-reverse and anti-relay coil short-circuit control circuit of electronic controller according to claim 1 is characterized in that, the described first protection diode is voltage-stabiliser tube.
3. the anti-reverse and anti-relay coil short-circuit control circuit of electronic controller according to claim 1 is characterized in that, the described second protection diode is two-way transient peak absorption tube.
4. the anti-reverse and anti-relay coil short-circuit control circuit of electronic controller according to claim 1 is characterized in that, the described first control triode is NPN type triode, and the described second control triode is the positive-negative-positive triode.
5. the anti-reverse and anti-relay coil short-circuit control circuit of electronic controller according to claim 1, it is characterized in that, described time-delay power down function, when MCU detects switching signal and is low level, the control mouth of MCU produces the unlatching that high level signal is kept triode Q1, relay is powered by VBAT, electric current enters relay through D9, Q2, reach the purpose of delay cut-off, data during to control circuit or rear end equipment work are stored, prevent loss of data, can control by switch simultaneously and wake up and dormancy.
6. the anti-reverse and anti-relay coil short-circuit control circuit of electronic controller according to claim 1; it is characterized in that; described relay coil short-circuit protection function; when the relay coil short circuit, when namely the RLY-ON current potential is 0V, can cause the positive electrode potential of D4 to be pulled to about 0.7V; therefore the Q1 base potential is 0V; Q1 manages shutoff, and Q2 manages shutoff, and Q2 can not damage by overcurrent.
7. the anti-reverse and anti-relay coil short-circuit control circuit of electronic controller according to claim 1, it is characterized in that, described anti-reverse function, when power positive cathode connects inverse time, not adhesive of relay, positive source links to each other with the positive pole of D1, arrive ground through R2, and another road makes its nonpassage by D3 and D4, relay coil no current process, not adhesive of relay.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310285978.2A CN103346553B (en) | 2013-07-09 | 2013-07-09 | Anti-reverse and the anti-relay coil short-circuit control circuit of a kind of electronic controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310285978.2A CN103346553B (en) | 2013-07-09 | 2013-07-09 | Anti-reverse and the anti-relay coil short-circuit control circuit of a kind of electronic controller |
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| CN103346553A true CN103346553A (en) | 2013-10-09 |
| CN103346553B CN103346553B (en) | 2015-10-21 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104477043A (en) * | 2014-11-14 | 2015-04-01 | 中国北车集团大连机车车辆有限公司 | DC power source time-delay supply circuit of urban rail vehicle |
| CN105857215A (en) * | 2016-04-21 | 2016-08-17 | 中国北方车辆研究所 | Reverse-connection-preventing and power-off post-processing circuit for vehicle-mounted control unit power supply |
| CN107613201A (en) * | 2017-09-13 | 2018-01-19 | 苏州科可瑞尔航空技术有限公司 | Image capturing system |
| CN113629661A (en) * | 2021-09-16 | 2021-11-09 | 中国北方发动机研究所(天津) | Heavy current reverse connection prevention and short circuit self-recovery power supply circuit |
| CN114597853A (en) * | 2022-03-07 | 2022-06-07 | 潍柴动力股份有限公司 | Wake-up short-circuit protection circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1713477A (en) * | 2004-06-15 | 2005-12-28 | 江苏苏亚机电制造有限公司 | Controller of outputting circuit for relay |
| CN201011705Y (en) * | 2006-12-20 | 2008-01-23 | 张忠平 | Brushless DC motor circuit for preventing power supply reverse connection |
| DE202011004621U1 (en) * | 2011-03-30 | 2011-11-02 | Andreas Heublein | Electromechanical safety circuit for solar systems |
-
2013
- 2013-07-09 CN CN201310285978.2A patent/CN103346553B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1713477A (en) * | 2004-06-15 | 2005-12-28 | 江苏苏亚机电制造有限公司 | Controller of outputting circuit for relay |
| CN201011705Y (en) * | 2006-12-20 | 2008-01-23 | 张忠平 | Brushless DC motor circuit for preventing power supply reverse connection |
| DE202011004621U1 (en) * | 2011-03-30 | 2011-11-02 | Andreas Heublein | Electromechanical safety circuit for solar systems |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104477043A (en) * | 2014-11-14 | 2015-04-01 | 中国北车集团大连机车车辆有限公司 | DC power source time-delay supply circuit of urban rail vehicle |
| CN105857215A (en) * | 2016-04-21 | 2016-08-17 | 中国北方车辆研究所 | Reverse-connection-preventing and power-off post-processing circuit for vehicle-mounted control unit power supply |
| CN105857215B (en) * | 2016-04-21 | 2017-11-14 | 中国北方车辆研究所 | Vehicular control unit power supply reverse connection protection and power down post processing circuitry |
| CN107613201A (en) * | 2017-09-13 | 2018-01-19 | 苏州科可瑞尔航空技术有限公司 | Image capturing system |
| CN113629661A (en) * | 2021-09-16 | 2021-11-09 | 中国北方发动机研究所(天津) | Heavy current reverse connection prevention and short circuit self-recovery power supply circuit |
| CN113629661B (en) * | 2021-09-16 | 2023-07-21 | 中国北方发动机研究所(天津) | Heavy-current reverse connection preventing and short-circuit self-recovery power supply circuit |
| CN114597853A (en) * | 2022-03-07 | 2022-06-07 | 潍柴动力股份有限公司 | Wake-up short-circuit protection circuit |
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| Publication number | Publication date |
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| CN103346553B (en) | 2015-10-21 |
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Effective date of registration: 20201111 Address after: Fuxing Road, Yicheng Economic Development Zone, Zaozhuang City, Shandong Province Patentee after: Zaozhuang Zhibo Intelligent Technology Co.,Ltd. Address before: 212009 Zhenjiang city of Jiangsu province science and Technology Park pan Zong Lu 38-4 Dingmao Patentee before: HENTS TECHNOLOGIES Inc. |
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Effective date of registration: 20230306 Address after: 277300 Ruibo fuel yard, Yinping Town, Yicheng District, Zaozhuang City, Shandong Province Patentee after: Huayue Drilling (Shandong) Craft Jewelry Co.,Ltd. Address before: 277300 Fuxing Road, Yicheng Economic Development Zone, Zaozhuang City, Shandong Province Patentee before: Zaozhuang Zhibo Intelligent Technology Co.,Ltd. |
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Effective date of registration: 20230331 Address after: 277300 South Kaibo Port Co., Ltd., Daliuzhuang Village, Gushao Town, Yicheng District, Zaozhuang City, Shandong Province Patentee after: Zaozhuang Kaibo Port Co.,Ltd. Address before: 277300 Ruibo fuel yard, Yinping Town, Yicheng District, Zaozhuang City, Shandong Province Patentee before: Huayue Drilling (Shandong) Craft Jewelry Co.,Ltd. |
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Denomination of invention: An electronic controller anti reverse connection and anti relay coil short circuit control circuit Effective date of registration: 20230831 Granted publication date: 20151021 Pledgee: Agricultural Bank of China Limited Zaozhuang Yicheng sub branch Pledgor: Zaozhuang Kaibo Port Co.,Ltd. Registration number: Y2023980054891 |