CN103762121A - Energy storage voltage stabilizing circuit for contactor power supply - Google Patents
Energy storage voltage stabilizing circuit for contactor power supply Download PDFInfo
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- CN103762121A CN103762121A CN201310755650.2A CN201310755650A CN103762121A CN 103762121 A CN103762121 A CN 103762121A CN 201310755650 A CN201310755650 A CN 201310755650A CN 103762121 A CN103762121 A CN 103762121A
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- power supply
- contactor
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- negative pole
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Abstract
The invention discloses an energy storage voltage stabilizing circuit for contactor power supply. One end of an inductor L is connected with a positive electrode of a power supply B, and the other end of the inductor L is connected with a positive electrode of a diode D. One end of a capacitor C2 is connected with a negative electrode of the diode D, and the other end of the capacitor C2 is connected with a negative electrode of the power supply B. One end of a resistor R1 is connected with the negative electrode of the diode D, and the other end of the resistor R1 is connected with one end of a resistor R2. One end of the resistor R2 is connected with the resistor R1, and the other end of the resistor R2 is connected with the negative electrode of the power supply B. One end of a contactor K coil is connected with the negative electrode of the diode D, and the other end of the contactor K coil is connected with a switch rube Q2. The shortcoming that in the prior art, contactor sucking closing is not reliable due to the fact power supply voltages are lowered is overcome, stability of the voltages at the two ends of a contactor is guaranteed, and the fault caused by the fact that contactor sucking closing is not reliable is effectively avoided.
Description
Technical field
The present invention relates to a kind of contactor power supply circuits, be specifically related to a kind of energy-storage voltage stabilizing circuit for contactor power supply.
Technical background
Contactor refers to frequently the switching device of the overload current of switch, carrying normal current and regulation, and it is applicable to far distance controlled, is the critical elements in automatic control system, is widely used in the start and stop of Electric Machine Control, blower fan, pump equipment etc.In the high-voltage power loop of electric automobile, often use contactor to carry out the control of low pressure break-make.Because vehicle-mounted power consumption equipment is a lot, when multiple equipment is worked simultaneously, when especially the powerful device such as air-conditioning, starter starts, can cause power supply voltage fluctuation, have a strong impact on the normal working voltage on contactor coil, cause contactor adhesive to obtain unreliable, under external force, even vehicle vibrations all may cause contactor to disconnect.Contactor disconnects extremely, can cause contactor to damage, when more serious, even can cause controller to burn, for overcoming the above problems, the present invention adopts accumulator, and electric energy is pre-stored, when there is fluctuation in contactor coil voltage, discharge storage of electrical energy, to reduce contactor coil voltage fluctuation, guarantee the reliability of contactor adhesive.
Summary of the invention
The present invention, for overcoming deficiency of the prior art, utilizes the energy storage characteristic of electric capacity, inductance, has solved the insecure problem of contactor adhesive that the mains fluctuations of prior art cause.
For achieving the above object, technical scheme of the present invention is:
For an energy-storage voltage stabilizing circuit for contactor power supply, be connected between power supply B and contactor K, comprising:
Power supply B positive pole is connected with inductance L one end, and negative pole is connected with triode Q1 emitter, capacitor C 2 one end, resistance R 2 one end, switching tube Q2 one end; Inductance L one end connects power supply B positive pole, and the other end is connected with diode D positive pole, triode Q1 emitter; Triode Q1 emitter connects inductance L, diode D positive pole, and base stage connects the output of PWM comparator, and collector electrode is connected with power supply B negative pole; Anodal inductance L one end, the triode Q1 emitter of connecting of diode D, negative pole is connected with capacitor C 2 one end, resistance R 1 one end, contactor K coil one end; Capacitor C 2 one end are connected with diode D negative pole, and the other end connects power supply B negative pole; Resistance R 1 one end is connected with diode D negative pole, and the other end is connected with resistance R 2 one end, EA amplifier inverting input; Resistance R 2 one end contact resistance R1, EA amplifier inverting input, the other end connects power supply B negative pole; Contactor K coil one end connects diode D negative pole, the other end and switching tube Q2 one end; Switching tube Q2 mono-termination contactor K coil one end, the other end is connected with power supply B negative pole; EA amplifier inverting input contact resistance R1 one end, resistance R 2 one end, in-phase input end connects reference voltage V
ref, output connects PWM comparator negative input end; PWM comparator positive input terminal connects a voltage source, and negative input end connects the output of EA amplifier, the base stage of output connecting triode Q1.
Described circuit also comprises capacitor C 1, and its one end connects power supply B positive pole, and the other end connects power supply B negative pole; Triode Q1 is mosfet transistor; It is triangle wave voltage source that PWM comparator positive input terminal connects voltage source; One end of switch Q2 connects MCU, is realized the break-make of contactor K by the break-make of MCU control Q2.
Compare existing contactor power supply, the present invention has remarkable advantage and beneficial effect, is embodied as:
Use this energy-storage voltage stabilizing circuit, can reduce the voltage fluctuation on contactor coil, to realize the reliable adhesive of contactor, effectively prevent the abnormal disconnection of contactor, extend the useful life of contactor, improve the performance of car load.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of contactor energy-storage voltage stabilizing circuit of the present invention.
Embodiment
Specific embodiment of the invention method is as follows:
Contactor comprises coil, iron core, contact etc., and when after contactor coil energising, coil current can produce magnetic field, and the magnetic field of generation makes iron core produce electromagnetic attraction, drives contact closure, switch conduction; When coil blackout, electromagnetic attraction disappears, and contact restores, and switch disconnects.
As Fig. 1, in this contactor electric power loop: power supply B positive pole is connected with inductance L one end, capacitor C 1 one end, negative pole is connected with capacitor C 1 other end, mosfet transistor Q1 source electrode, capacitor C 2 one end, resistance R 2 one end, mosfet transistor Q2 source electrode; Capacitor C 1 one end connects power supply B positive pole, and the other end connects power supply B negative pole; Inductance L one end connects power supply B positive pole, and the other end connects diode D positive pole, mosfet transistor Q1 drain electrode; Mosfet transistor Q1 drain electrode connects inductance L, diode D positive pole, and grid connects the output of PWM comparator, and source electrode is connected with power supply B negative pole; The anodal connection of diode D inductance L one end, mosfet transistor Q1 drain electrode, negative pole is connected with capacitor C 2 one end, resistance R 1 one end, contactor K coil one end; Capacitor C 2 one end are connected with diode D negative pole, and the other end connects power supply B negative pole; Resistance R 1 one end is connected with diode D negative pole, and the other end is connected with resistance R 2 one end, EA amplifier inverting input; Resistance R 2 one end contact resistance R1, EA amplifier inverting input, the other end connects power supply B negative pole; Contactor K coil one end connects diode D negative pole, the other end and mosfet transistor Q2 drain electrode; Mosfet transistor Q2 drain electrode connects contactor K coil one end, and source electrode is connected with power supply B negative pole; EA amplifier inverting input contact resistance R1 one end, resistance R 2 one end, in-phase input end connects reference voltage V
ref, output connects PWM comparator negative input end; PWM comparator positive input terminal connects a voltage source, and negative input end connects the output of EA amplifier, and output connects the grid of mosfet transistor Q1.
Above-mentioned capacitor C 1 is for filtering; Resistance R 1 and resistance R 2 are to gather contactor K both end voltage for EA amplifier, are convenient to monitor in real time the operating voltage of contactor K; It is triangle wave voltage source that PWM comparator positive input terminal connects voltage source; The grid of mosfet transistor Q2 connects MCU, is realized the break-make of contactor K by the break-make of MCU control Q2; The contactor K both end voltage that EA amplifier arrives Real-time Collection is with reference voltage V
refrelatively, and feed back to PWM comparator after both differences are amplified, by this difference, with PWM comparator positive input terminal voltage ratio, controlled the break-make of mosfet transistor Q1, to guarantee that the voltage of contactor K maintains its optimum operating voltage.
When power supply B-source is during higher than the optimum operating voltage of contactor K, mosfet transistor Q1 conducting, by power supply, B charges to inductance L, electric energy conversion is that magnetic energy is stored in inductance L, now capacitor C 2 both end voltage are approximately equal to supply voltage, by capacitor C 2, power to contactor K, diode D prevents that electric current from flowing back to power supply B.When power supply B undertension, contactor K voltage is during lower than optimum operating voltage, and mosfet transistor Q1 disconnects, and inductance L magnetic energy converts electric energy to, now the voltage V of contactor K
ofor the electromotive force of inductance L generation and the stack of power supply B voltage, be greater than power supply B voltage V
i, charge to capacitor C 2 simultaneously.Mosfet transistor Q1 switch periods is T, T
onfor ON time, contactor K voltage V
0=V
i× [T/ (T-T
on)].Contactor K voltage V
oby mosfet transistor Q1 ON time, determined, and ON time T
onconcrete size by feedback control loop, determined.So when contactor K both end voltage is more than or equal to its optimum operating voltage, mosfet transistor Q1 ON time is elongated, when contactor K both end voltage is during lower than its optimum operating voltage, mosfet transistor Q1 ON time shortens, and makes contactor K both end voltage maintain optimum operating voltage.For being example embodiment of the present invention; should be understood to is a certain demonstrative example wherein in the protection range of claims of the present invention; there is the directiveness effect that those skilled in the art is realized to corresponding technical scheme, but not limitation of the invention.
Claims (5)
1. for an energy-storage voltage stabilizing circuit for contactor power supply, it is characterized in that: be connected between power supply B and contactor K, comprise:
Power supply B positive pole is connected with inductance L one end, and negative pole is connected with triode Q1 emitter, capacitor C 2 one end, resistance R 2 one end, switching tube Q2 one end;
Inductance L one end connects power supply B positive pole, and the other end is connected with diode D positive pole, triode Q1 emitter;
Triode Q1 emitter connects inductance L, diode D positive pole, and base stage connects the output of PWM comparator, and collector electrode is connected with power supply B negative pole;
Anodal inductance L one end, the triode Q1 emitter of connecting of diode D, negative pole is connected with capacitor C 2 one end, resistance R 1 one end, contactor K coil one end;
Capacitor C 2 one end are connected with diode D negative pole, and the other end connects power supply B negative pole;
Resistance R 1 one end is connected with diode D negative pole, and the other end is connected with resistance R 2 one end, EA amplifier inverting input;
Resistance R 2 one end contact resistance R1, EA amplifier inverting input, the other end connects power supply B negative pole;
Contactor K coil one end connects diode D negative pole, the other end and switching tube Q2 one end;
Switching tube Q2 mono-termination contactor K coil one end, the other end is connected with power supply B negative pole;
EA amplifier inverting input contact resistance R1 one end, resistance R 2 one end, in-phase input end connects reference voltage V
rEF, output connects PWM comparator negative input end;
PWM comparator positive input terminal connects a voltage source, and negative input end connects the output of EA amplifier, the base stage of output connecting triode Q1.
2. a kind of energy-storage voltage stabilizing circuit for contactor power supply according to claim 1, is characterized in that: described circuit also comprises capacitor C 1, and its one end connects power supply B positive pole, and the other end connects power supply B negative pole.
3. a kind of energy-storage voltage stabilizing circuit for contactor power supply according to claim 1, is characterized in that: described triode Q1 is mosfet transistor.
4. a kind of energy-storage voltage stabilizing circuit for contactor power supply according to claim 1, is characterized in that: it is triangle wave voltage source that described PWM comparator positive input terminal connects voltage source.
5. a kind of energy storage booster circuit for contactor power supply according to claim 1, is characterized in that: one end of described switch Q2 connects MCU, is realized the break-make of contactor K by the break-make of MCU control Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310755650.2A CN103762121A (en) | 2013-12-27 | 2013-12-27 | Energy storage voltage stabilizing circuit for contactor power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310755650.2A CN103762121A (en) | 2013-12-27 | 2013-12-27 | Energy storage voltage stabilizing circuit for contactor power supply |
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| Publication Number | Publication Date |
|---|---|
| CN103762121A true CN103762121A (en) | 2014-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310755650.2A Pending CN103762121A (en) | 2013-12-27 | 2013-12-27 | Energy storage voltage stabilizing circuit for contactor power supply |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5930104A (en) * | 1998-03-06 | 1999-07-27 | International Controls And Measurement Corp. | PWM relay actuator circuit |
| CN2556778Y (en) * | 2002-07-05 | 2003-06-18 | 北京通力环电气股份有限公司 | Constand-current driven DC relay controller |
| CN101552540A (en) * | 2008-04-02 | 2009-10-07 | 邓琦 | A boost converter and a power comprising the converter |
| US20090316323A1 (en) * | 2008-06-18 | 2009-12-24 | Sma Solar Technology Ag | Circuit arrangement with a relay incorporating one field coil as well as switch contacts |
| CN102624223A (en) * | 2012-04-06 | 2012-08-01 | 阳光电源股份有限公司 | Drive power circuit and driving method of low-energy-consumption relay |
-
2013
- 2013-12-27 CN CN201310755650.2A patent/CN103762121A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5930104A (en) * | 1998-03-06 | 1999-07-27 | International Controls And Measurement Corp. | PWM relay actuator circuit |
| CN2556778Y (en) * | 2002-07-05 | 2003-06-18 | 北京通力环电气股份有限公司 | Constand-current driven DC relay controller |
| CN101552540A (en) * | 2008-04-02 | 2009-10-07 | 邓琦 | A boost converter and a power comprising the converter |
| US20090316323A1 (en) * | 2008-06-18 | 2009-12-24 | Sma Solar Technology Ag | Circuit arrangement with a relay incorporating one field coil as well as switch contacts |
| CN102624223A (en) * | 2012-04-06 | 2012-08-01 | 阳光电源股份有限公司 | Drive power circuit and driving method of low-energy-consumption relay |
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Application publication date: 20140430 |