CN105895451A - AC/DC universal intelligent contactor - Google Patents
AC/DC universal intelligent contactor Download PDFInfo
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- CN105895451A CN105895451A CN201610317175.4A CN201610317175A CN105895451A CN 105895451 A CN105895451 A CN 105895451A CN 201610317175 A CN201610317175 A CN 201610317175A CN 105895451 A CN105895451 A CN 105895451A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
- H01H47/223—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil adapted to be supplied by AC
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- Relay Circuits (AREA)
Abstract
The invention relates to an AC/DC universal intelligent contactor. The AC/DC universal intelligent contactor comprises an electromagnetic system and a contact system, wherein the electromagnetic system comprises a first AC/DC power supply, a rectification filter module, a coil voltage detection module, a coil current detection module, a switching power supply module, a first switching tube, a first power driving module, a second switching tube, a second power driving module, a microprocessor, a freewheeling diode, a clamping circuit and an excitation coil, and the contact system comprises a second AC/DC power supply, a third switching tube, a third power driving module, a contact current detection module, a contact voltage detection module, a first inductor, a second inductor, a fourth switching tube, a fourth power driving module, an overvoltage suppression and energy absorption loop, a main contact, a diode, a capacitor, a current limiting resistor and a load. By the AC/DC universal intelligent contactor, the AC/DC universality of the contact system, the AC/DC universality of the electromagnetic system and energy-saving silent running are achieved.
Description
Technical field
The present invention relates to electromagnetic AC contactor field, particularly a kind of AC/DC universal intelligent contactor.
Background technology
In recent years, the intelligent control technology of electromagnetic AC contactor quickly grows.At present, the intelligent control technology of Electromagnetic System of Contactor has been realized in Width funtion input, AC/DC universal controls, the no-voltage adhesive technology and the Zero current disjunction technology that apply simultaneously to contact system also reach its maturity, greatly improve the property indices of A.C. contactor, expand application.
Development along with new energy technology, the demand of high-capacity direct current catalyst gets more and more, it is widely used in the fields such as photovoltaic generation, wind-power electricity generation, electric automobile, hybrid power, subway, boats and ships, space flight and aviation, its reliability and service life are had higher requirement.But owing to DC current does not has natural zero-crossing point, cause direct-current arc to be difficult to extinguish, easily cause contact and corrode even melting welding, have a strong impact on the electric life of D.C. contactor and the operational reliability of system.
At present, composing in parallel composite switch frequently with electronic power switch and mechanical switch both at home and abroad, in mechanical switch Guan Bi and breaking course, electronic power switch works, and reaches the mechanical switch effect without arc action.But, in the breaking course of high-capacity direct current catalyst, electric current depends on arc voltage from mechanical switch to electronic power switch transfer, owing to arc voltage is less and the existence of commutating circuit stray inductance, causes transfer time longer.Simultaneously because the energy of storage must be born by electronic power switch completely in circuit, this not only brings challenge greatly to electronic power switch, often also need to the biggest heat dissipating mass, limit the application in high-capacity direct current catalyst of this technology to a certain extent, also become the bottleneck of DC application system development simultaneously.
Manually forcing zero passage technology, on the basis of DC current, superposition alternating current realizes manually forcing zero passage disjunction, and the defect that can effectively solve straight-flow system is avoided that again composite switch technology shortcoming in high-capacity direct current catalyst breaking course.But, conventional zero passage technology of manually forcing is applicable to the breaker control system infrequently operated, and the catalyst for frequent operation controls and inapplicable.Electric arc between the contact bounce in catalyst attracting process, the contact in breaking course, all produces serious influence to the index of aging of catalyst.If composite switch can control technology incorporate and manually force zero passage thinking, in conjunction with both advantages, can effectively solve the problems referred to above, can guarantee that again mechanical switch is without arc action.But, run on the electromagnetic treadle in low-voltage direct-current system, in breaking course, owing to demagnetization speed is slow, movement time is long, and its service behaviour cannot meet the requirement manually forcing zero passage technology.By taking to apply the quick demagnetization scheme of negative pressure, it is expected to the just-off speed of control contactor breaking course, intends meeting and manually force zero passage technology for the requirement of contact disjunction rapidity.
On the other hand, along with the development of low-voltage distribution system supplied by AC/DC electricity integration, the increase of alternating current-direct current electrical equipment, the single control model of contact system can not meet demand.And due to the kind of A.C. contactor and quantity D.C. contactor to be far longer than, for the catalyst of equivalent capability, the volume of A.C. contactor, cost, performance have overwhelming superiority.Therefore, usually occur holding A.C. contactor fall using the situation replacing D.C. contactor, and along with the demand of D.C. contactor gets more and more, this way will certainly cause waste greatly.Control technology in conjunction with composite switch, force zero passage technology, no-voltage adhesive to propose a kind of novel switched electrical equipment, the just thinking of the present invention with zero-current-break control technology.
Summary of the invention
In view of this, the purpose of the present invention is to propose to a kind of AC/DC universal intelligent contactor, it is achieved that the AC/DC universal of contact system, and the AC/DC universal of electromagnetic system, energy-saving, noiseless run.
The present invention uses below scheme to realize: a kind of AC/DC universal intelligent contactor, specifically includes electromagnetic system and contact system；Described electromagnetic system includes the first AC/DC power supply, rectification filtering module, coil voltage detection module, coil current detection module, switch power module, the first switching tube, the first power driver module, second switch pipe, the second power driver module, microprocessor, fly-wheel diode, clamp circuit, magnetizing coil；Described contact system includes the second AC/DC power supply, the 3rd switching tube, the 3rd power driver module, contact current detection module, contact voltage detection module, the first inductance, the second inductance, the 4th switching tube, the 4th power driver module, Overvoltage suppressing and energy absorption loop, main contact, diode, electric capacity, current-limiting resistance, load；
Described microprocessor is electrical connected with described first power driver module, the second power driver module, the 3rd power driver module, the 4th power driver module, switch power module, coil voltage detection module, coil current detection module, contact current detection module, contact voltage detection module；
Described switch power module is connected with described first AC/DC power supply, the first power driver module, the second power driver module, the 3rd power driver module, the 4th power driver module, microprocessor；
Described first AC/DC power supply is connected to rectification filtering module, coil voltage detection module；Described rectification filtering module is respectively connecting to described fly-wheel diode, magnetizing coil through described first switching tube；Described fly-wheel diode is through described second switch pipe ground connection；Described second switch pipe is also connected to described clamp circuit；Described magnetizing coil is electrical connected with described coil current detection module；
Described second AC/DC power supply forms major loop through described contact current detection module, described main contact and described load；Described main contact is also connected to described contact voltage detection module and described Overvoltage suppressing and energy absorption loop；Described 3rd switching tube, the first inductance, the second inductance, diode composition branch road and be connected to described main contact；The branch road of described second inductance and diode composition is also connected to described electric capacity；Described electric capacity is through described 4th switching tube, current-limiting resistance and is connected to load two ends；
Described first power driver module, the second power driver module, the 3rd power driver module, the 4th power driver module are respectively and electrically connected to described first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, drive described first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube in order to controlling.
First AC/DC power supply becomes stable direct current after rectifying and wave-filtering; Switching Power Supply provides electric energy for corresponding module in circuit; coil voltage detection module is used for detecting electromagnetic system magnitude of voltage; protection electromagnetic system normally works; microprocessor uses the single-chip computer control system of digit chip, and digital information processing system has the features such as speed is fast, precision is high, function is strong, control is flexible, versatility is good, capacity of resisting disturbance is strong.By the feedback quantity of coil current detection module, microprocessor control the first switching tube by the first power driver module, the DC voltage after rectification is carried out closed loop chop control, regulate magnetizing coil working current value；Second switch pipe, as auxiliary switch, constitutes afterflow demagnetization loop, the continuous current circuit that second switch pipe is constituted, work, regulating winding electric current when the first switching tube turns off with fly-wheel diode with fly-wheel diode and clamp circuit；Clamp circuit is made up of Transient Suppression Diode, parts selection, Parameter adjustable, forms demagnetization loop with fly-wheel diode, absorbs reverse transient energy, plays the effect of quickly demagnetization.Clamp circuit can arrange vacuum magnitude flexibly simultaneously, thus controls speed of demagnetizing so that when disjunction, the just-off speed of contact meets rapidity requirement.
Second AC/DC power supply is main circuit power supply power supply.Contact current detection module is used for detecting main contact current value, and contact voltage detection module is for judging type and the size of contact system the second AC/DC power supply.When the type of the second AC/DC power supply is for exchange, by contact voltage detection module and the feedback quantity of contact current detection module, make main contact action in no-voltage adhesive and Zero current disjunction.When the second AC/DC power supply is direct current, main contact, the 3rd switching tube, the first inductance, the second inductance, diode constitute composite switch, adhesive stage, microprocessor control the 3rd switching tube by the 3rd power driver module and make main contact close without arc；In the sticking stage, electric capacity, the 4th switching tube, current-limiting resistance constitute the charge circuit of electric capacity, are directly pre-charged electric capacity from the second AC/DC power supply extracting energy；The disjunction stage, 3rd switching tube, the first inductance, electric capacity, main contact form resonance current positive half period loop, by the feedback quantity of contact current detection module, microprocessor control the 3rd switching tube by the 3rd power driver module and make to force zero passage technology to come into operation in the expected value of contact electric current；Electric capacity, the second inductance, diode constitute resonance current negative half-cycle loop, it is to avoid main contact undertakes more than 2 times rated current and aggravates arc burning.After contact arc extinction, the 3rd switching tube turns off, and Overvoltage suppressing and energy absorption loop works prevent electronic component breakdown, absorbs the energy being stored in circuit simultaneously.
Further, when described second AC/DC power supply is direct current, the work process of described AC/DC universal intelligent contactor includes the three below stage:
The adhesive stage: when described coil voltage detection module detects that electromagnetic system voltage is in the range of adhesive, set PWM operating frequency and dutycycle and the reference value of exciting curent, the microprocessor feedback quantity by described coil current detection module, controls electromagnetic system closed loop and starts；When exciting curent reaches default expected value, turning on the 3rd switching tube, now main contact not yet closes, and main circuit current flows through from the 3rd switching tube, the first inductance, the second inductance, diode, forms composite switch；Owing to the 3rd switching tube is in the conduction state in main contact closing course, therefore closing course produces without electric arc；When main contact is of completely closed, because contact resistance is far smaller than the conducting resistance of the 3rd switching tube place branch road, main circuit current nature commutation is to main contact, and the 3rd switching tube turns off, and attracting process terminates；
The sticking stage: after the adhesive stage terminates, AC/DC universal intelligent contactor proceeds to sticking and controls program: reset PWM duty cycle, realize closed-loop current control, maintain the most constant, in the range of magnetizing coil electric current is maintained a default low value of magnetizing coil electric current；There is the features such as sticking power consumption is little, little by such environmental effects, control voltage variations affect is little, there is good stability and capacity of resisting disturbance.While proceeding to sticking control program, turning on the 4th switching tube, electric capacity is charged to contact system magnitude of voltage by current-limiting resistance by the second AC/DC power supply；Electric capacity charging voltage is directly from contact system voltage extracting, and without external dc power supply, control module volume reduces.
The disjunction stage: when coil voltage detection module detects electromagnetic system voltage less than release voltage, turning off second switch pipe and the 4th switching tube, clamp circuit works, magnetizing coil demagnetizes rapidly, sound iron core drives dynamic/static contact sharp separation, and electric arc produces, and main contact electric current begins to decline；By the feedback quantity of contact current detection module, controlling the 3rd switching tube and turn at the expected value of contact electric current, the first inductance and electric capacity start resonance, and resonance current flows through main contact, superposes manufacture of intraocular current zero-crossing point, arc extinction with DC current；If now medium recovery strength is more than recovering voltage strength, then arc extinction will not be restriked, and then the 3rd switching tube is setting time point shutoff, Overvoltage suppressing and energy absorption loop works, prevents electronic component breakdown, absorbs the energy being stored in circuit simultaneously；Introduce the feedback quantity of contact electric current, in order to judge the turn-on instant of the 3rd switching tube, having abandoned traditional scheme relies on the method for time delay to determine the input moment of resonance circuit, and the program is not only restricted to the impact of electromagnetic mechanism action dispersibility, and causes arc extinguishing failure or arc quenching effect to be deteriorated.If now medium recovery strength is less than recovering voltage strength, then electric arc is restriked；When capacitance voltage reaches reversed peak, resonance current is reverse, now diode is in forward bias conducting state, electric capacity, the second inductance, diode constitute resonance current negative half-cycle loop, it is to avoid resonance current forward flows through rated current that main contact causes main contact to undertake more than 2 times and aggravates arc burning and contact burning；When resonance current zero passage again, if electric arc does not also extinguish, then resonance current flows counterflow through main contact again, remanufactures artificial zero crossing；Resonant process has periodically, until arc extinction.Therefore, in any moment, main contact maximum current is only rated current, efficiently solves tradition and forces the drawback of zero passage technology.
Further, when described second AC/DC power supply is for exchange, the work process of described AC/DC universal intelligent contactor includes the three below stage:
The adhesive stage: when coil voltage detection module detect electromagnetic system voltage in the range of adhesive, by the point of zero voltage of contact voltage detection module detection contact system the second AC/DC power supply, through Program time delay, magnetizing coil obtains electric, and starting process starts；The microprocessor feedback quantity by coil current detection module, sets PWM operating frequency and dutycycle and the reference value of exciting curent, thus controls electromagnetic system closed loop and start；After the intrinsic movement time of electromagnetic mechanism, dynamic and static contact is in the point of zero voltage region adhesive of the second AC/DC power supply, it is achieved no-voltage attracting process controls；
In the sticking stage: after attracting process terminates, AC/DC universal intelligent contactor proceeds to sticking and controls program；Reset PWM duty cycle, it is achieved closed-loop current control, maintain the most constant, in the range of magnetizing coil electric current is maintained a default low value of magnetizing coil electric current；There is the features such as sticking power consumption is little, little by such environmental effects, control voltage variations affect is little, there is good stability and capacity of resisting disturbance.
The disjunction stage: when coil voltage detection module detects electromagnetic system voltage less than release voltage, zero point by contact current detection module detection main contact electric current, through Program time delay, magnetizing coil power-off, clamp circuit works, and magnetizing coil demagnetizes rapidly, after the intrinsic movement time of mechanism, dynamic/static contact disconnects in the current zero region set, it is achieved zero-current-break control.
Compared with prior art, the present invention has a following beneficial effect:
1, present invention achieves the AC/DC universal of contact system, and the AC/DC universal of electromagnetic system, energy-saving, noiseless run.And can automatically detect contact system of contactor operation occasion by contact voltage detection module.
2, the present invention works under DC circuit when contact system, in the adhesive stage, uses composite switch technology, utilizes electronic power switch, it is achieved without arc adhesive；In the disjunction stage, use and force zero passage technology, in conjunction with the feedback signal of contact current detection module, determine the input moment of resonance circuit, it is to avoid the impact of electromagnetic mechanism action dispersibility, be greatly improved reliability and the accuracy of disjunction.
3, the present invention is in adhesive and two stages of disjunction, shares same electronic power switch, and by composite switch technology and force the ingenious fusion of zero passage technology, the energy of electric capacity precharge simultaneously, directly from contact system voltage extracting, reduces Financial cost and module volume.Simultaneously as have employed the resonance circuit pattern of positive and negative half-wave different circuit, it is to avoid cause contact to undertake the situation of more than 2 times rated current due to disjunction failure.
4, the present invention works under alternating current circuit when contact system, by contact voltage detection module and the feedback signal of contact current detection module, microprocessor judges and analyzes, it is achieved connecting without arc and thick-less vane control of contact loop.
Accompanying drawing explanation
Fig. 1 is the system principle diagram of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described.
As it is shown in figure 1, present embodiments provide a kind of AC/DC universal intelligent contactor, specifically include electromagnetic system and contact system；Described electromagnetic system includes the first AC/DC power supply, rectification filtering module, coil voltage detection module, coil current detection module, switch power module, the first switching tube, the first power driver module, second switch pipe, the second power driver module, microprocessor, fly-wheel diode, clamp circuit, magnetizing coil；Described contact system includes the second AC/DC power supply, the 3rd switching tube, the 3rd power driver module, contact current detection module, contact voltage detection module, the first inductance, the second inductance, the 4th switching tube, the 4th power driver module, Overvoltage suppressing and energy absorption loop, main contact, diode, electric capacity, current-limiting resistance, load；
Described microprocessor is electrical connected with described first power driver module, the second power driver module, the 3rd power driver module, the 4th power driver module, switch power module, coil voltage detection module, coil current detection module, contact current detection module, contact voltage detection module；
Described switch power module is connected with described first AC/DC power supply, the first power driver module, the second power driver module, the 3rd power driver module, the 4th power driver module, microprocessor；
Described first AC/DC power supply is connected to rectification filtering module, coil voltage detection module；Described rectification filtering module is respectively connecting to described fly-wheel diode, magnetizing coil through described first switching tube；Described fly-wheel diode is through described second switch pipe ground connection；Described second switch pipe is also connected to described clamp circuit；Described magnetizing coil is electrical connected with described coil current detection module；
Described second AC/DC power supply forms major loop through described contact current detection module, described main contact and described load；Described main contact is also connected to described contact voltage detection module and described Overvoltage suppressing and energy absorption loop；Described 3rd switching tube, the first inductance, the second inductance, diode composition branch road and be connected to described main contact；The branch road of described second inductance and diode composition is also connected to described electric capacity；Described electric capacity is through described 4th switching tube, current-limiting resistance and is connected to load two ends；
Described first power driver module, the second power driver module, the 3rd power driver module, the 4th power driver module are respectively and electrically connected to described first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, drive described first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube in order to controlling.
In the present embodiment; first AC/DC power supply becomes stable direct current after rectifying and wave-filtering; Switching Power Supply provides electric energy for corresponding module in circuit; coil voltage detection module is used for detecting electromagnetic system magnitude of voltage; protection electromagnetic system normally works; microprocessor uses the single-chip computer control system of digit chip, and digital information processing system has the features such as speed is fast, precision is high, function is strong, control is flexible, versatility is good, capacity of resisting disturbance is strong.By the feedback quantity of coil current detection module, microprocessor control the first switching tube by the first power driver module, the DC voltage after rectification is carried out closed loop chop control, regulate magnetizing coil working current value；Second switch pipe, as auxiliary switch, constitutes afterflow demagnetization loop, the continuous current circuit that second switch pipe is constituted, work, regulating winding electric current when the first switching tube turns off with fly-wheel diode with fly-wheel diode and clamp circuit；Clamp circuit is made up of Transient Suppression Diode, parts selection, Parameter adjustable, forms demagnetization loop with fly-wheel diode, absorbs reverse transient energy, plays the effect of quickly demagnetization.Clamp circuit can arrange vacuum magnitude flexibly simultaneously, thus controls speed of demagnetizing so that when disjunction, the just-off speed of contact meets rapidity requirement.
Second AC/DC power supply is main circuit power supply power supply.Contact current detection module is used for detecting main contact current value, and contact voltage detection module is for judging type and the size of contact system the second AC/DC power supply.When the type of the second AC/DC power supply is for exchange, by contact voltage detection module and the feedback quantity of contact current detection module, make main contact action in no-voltage adhesive and Zero current disjunction.When the second AC/DC power supply is direct current, main contact, the 3rd switching tube, the first inductance, the second inductance, diode constitute composite switch, adhesive stage, microprocessor control the 3rd switching tube by the 3rd power driver module and make main contact close without arc；In the sticking stage, electric capacity, the 4th switching tube, current-limiting resistance constitute the charge circuit of electric capacity, are directly pre-charged electric capacity from the second AC/DC power supply extracting energy；The disjunction stage, 3rd switching tube, the first inductance, electric capacity, main contact form resonance current positive half period loop, by the feedback quantity of contact current detection module, microprocessor control the 3rd switching tube by the 3rd power driver module and make to force zero passage technology to come into operation in the expected value of contact electric current；Electric capacity, the second inductance, diode constitute resonance current negative half-cycle loop, it is to avoid main contact undertakes more than 2 times rated current and aggravates arc burning.After contact arc extinction, the 3rd switching tube turns off, and Overvoltage suppressing and energy absorption loop works prevent electronic component breakdown, absorbs the energy being stored in circuit simultaneously.
In the present embodiment, when described second AC/DC power supply is direct current, the work process of described AC/DC universal intelligent contactor includes the three below stage:
The adhesive stage: when described coil voltage detection module detects that electromagnetic system voltage is in the range of adhesive, set PWM operating frequency and dutycycle and the reference value of exciting curent, the microprocessor feedback quantity by described coil current detection module, controls electromagnetic system closed loop and starts；When exciting curent reaches default expected value, turning on the 3rd switching tube, now main contact not yet closes, and main circuit current flows through from the 3rd switching tube, the first inductance, the second inductance, diode, forms composite switch；Owing to the 3rd switching tube is in the conduction state in main contact closing course, therefore closing course produces without electric arc；When main contact is of completely closed, because contact resistance is far smaller than the conducting resistance of the 3rd switching tube place branch road, main circuit current nature commutation is to main contact, and the 3rd switching tube turns off, and attracting process terminates；
In the sticking stage: after the adhesive stage terminates, AC/DC universal intelligent contactor proceeds to sticking and controls program: resets PWM duty cycle, it is achieved closed-loop current control, maintains the most constant, in the range of magnetizing coil electric current maintains a low value of magnetizing coil electric current；There is the features such as sticking power consumption is little, little by such environmental effects, control voltage variations affect is little, there is good stability and capacity of resisting disturbance.While proceeding to sticking control program, turning on the 4th switching tube, electric capacity is charged to contact system magnitude of voltage by current-limiting resistance by the second AC/DC power supply；Electric capacity charging voltage is directly from contact system voltage extracting, and without external dc power supply, control module volume reduces.
The disjunction stage: when coil voltage detection module detects electromagnetic system voltage less than release voltage, turning off second switch pipe and the 4th switching tube, clamp circuit works, magnetizing coil demagnetizes rapidly, sound iron core drives dynamic/static contact sharp separation, and electric arc produces, and main contact electric current begins to decline；By the feedback quantity of contact current detection module, controlling the 3rd switching tube and turn at the expected value of contact electric current, the first inductance and electric capacity start resonance, and resonance current flows through main contact, superposes manufacture of intraocular current zero-crossing point, arc extinction with DC current；If now medium recovery strength is more than recovering voltage strength, then arc extinction will not be restriked, and then the 3rd switching tube is setting time point shutoff, Overvoltage suppressing and energy absorption loop works, prevents electronic component breakdown, absorbs the energy being stored in circuit simultaneously；Introduce the feedback quantity of contact electric current, in order to judge the turn-on instant of the 3rd switching tube, having abandoned traditional scheme relies on the method for time delay to determine the input moment of resonance circuit, and the program is not only restricted to the impact of electromagnetic mechanism action dispersibility, and causes arc extinguishing failure or arc quenching effect to be deteriorated.If now medium recovery strength is less than recovering voltage strength, then electric arc is restriked；When capacitance voltage reaches reversed peak, resonance current is reverse, now diode is in forward bias conducting state, electric capacity, the second inductance, diode constitute resonance current negative half-cycle loop, it is to avoid resonance current forward flows through rated current that main contact causes main contact to undertake more than 2 times and aggravates arc burning and contact burning；When resonance current zero passage again, if electric arc does not also extinguish, then resonance current flows counterflow through main contact again, remanufactures artificial zero crossing；Resonant process has periodically, until arc extinction.Therefore, in any moment, main contact maximum current is only rated current, efficiently solves tradition and forces the drawback of zero passage technology.
In the present embodiment, when described second AC/DC power supply is for exchange, the work process of described AC/DC universal intelligent contactor includes the three below stage:
The adhesive stage: when coil voltage detection module detect electromagnetic system voltage in the range of adhesive, by the point of zero voltage of contact voltage detection module detection contact system the second AC/DC power supply, through Program time delay, magnetizing coil obtains electric, and starting process starts；The microprocessor feedback quantity by coil current detection module, sets PWM operating frequency and dutycycle and the reference value of exciting curent, thus controls electromagnetic system closed loop and start；After the intrinsic movement time of electromagnetic mechanism, dynamic and static contact is in the point of zero voltage region adhesive of the second AC/DC power supply, it is achieved no-voltage attracting process controls；
In the sticking stage: after attracting process terminates, AC/DC universal intelligent contactor proceeds to sticking and controls program；Reset PWM duty cycle, it is achieved closed-loop current control, maintain the most constant, in the range of magnetizing coil electric current is maintained a default low value of magnetizing coil electric current；There is the features such as sticking power consumption is little, little by such environmental effects, control voltage variations affect is little, there is good stability and capacity of resisting disturbance.
The disjunction stage: when coil voltage detection module detects electromagnetic system voltage less than release voltage, zero point by contact current detection module detection main contact electric current, through Program time delay, magnetizing coil power-off, clamp circuit works, and magnetizing coil demagnetizes rapidly, after the intrinsic movement time of mechanism, dynamic/static contact disconnects in the current zero region set, it is achieved zero-current-break control.
The foregoing is only presently preferred embodiments of the present invention, all impartial changes done according to scope of the present invention patent and modification, all should belong to the covering scope of the present invention.
Claims (3)
1. an AC/DC universal intelligent contactor, it is characterised in that: include electromagnetic system and contact system；Described electromagnetic system includes the first AC/DC power supply, rectification filtering module, coil voltage detection module, coil current detection module, switch power module, the first switching tube, the first power driver module, second switch pipe, the second power driver module, microprocessor, fly-wheel diode, clamp circuit, magnetizing coil；Described contact system includes the second AC/DC power supply, the 3rd switching tube, the 3rd power driver module, contact current detection module, contact voltage detection module, the first inductance, the second inductance, the 4th switching tube, the 4th power driver module, Overvoltage suppressing and energy absorption loop, main contact, diode, electric capacity, current-limiting resistance, load；
Described microprocessor is electrical connected with described first power driver module, the second power driver module, the 3rd power driver module, the 4th power driver module, switch power module, coil voltage detection module, coil current detection module, contact current detection module, contact voltage detection module；
Described switch power module is connected with described first AC/DC power supply, the first power driver module, the second power driver module, the 3rd power driver module, the 4th power driver module, microprocessor；
Described first AC/DC power supply is connected to rectification filtering module, coil voltage detection module；Described rectification filtering module is respectively connecting to described fly-wheel diode, magnetizing coil through described first switching tube；Described fly-wheel diode is through described second switch pipe ground connection；Described second switch pipe is also connected to described clamp circuit；Described magnetizing coil is electrical connected with described coil current detection module；
Described second AC/DC power supply forms major loop through described contact current detection module, described main contact and described load；Described main contact is also connected to described contact voltage detection module and described Overvoltage suppressing and energy absorption loop；Described 3rd switching tube, the first inductance, the second inductance, diode composition branch road and be connected to described main contact；The branch road of described second inductance and diode composition is also connected to described electric capacity；Described electric capacity is through described 4th switching tube, current-limiting resistance and is connected to load two ends；
Described first power driver module, the second power driver module, the 3rd power driver module, the 4th power driver module are respectively and electrically connected to described first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, drive described first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube in order to controlling.
A kind of AC/DC universal intelligent contactor the most according to claim 1, it is characterised in that: when described second AC/DC power supply is direct current, the work process of described AC/DC universal intelligent contactor includes the three below stage:
The adhesive stage: when described coil voltage detection module detects that electromagnetic system voltage is in the range of adhesive, set PWM operating frequency and dutycycle and the reference value of exciting curent, the microprocessor feedback quantity by described coil current detection module, controls electromagnetic system closed loop and starts；When exciting curent reaches default expected value, turning on the 3rd switching tube, now main contact not yet closes, and main circuit current flows through from the 3rd switching tube, the first inductance, the second inductance, diode, forms composite switch；Owing to the 3rd switching tube is in the conduction state in main contact closing course, therefore closing course produces without electric arc；When main contact is of completely closed, because contact resistance is far smaller than the conducting resistance of the 3rd switching tube place branch road, main circuit current nature commutation is to main contact, and the 3rd switching tube turns off, and attracting process terminates；
In the sticking stage: after the adhesive stage terminates, AC/DC universal intelligent contactor proceeds to sticking and controls program: resets PWM duty cycle, it is achieved closed-loop current control, maintains the most constant, in the range of magnetizing coil electric current maintains a low value of magnetizing coil electric current；While proceeding to sticking control program, turning on the 4th switching tube, electric capacity is charged to contact system magnitude of voltage by current-limiting resistance by the second AC/DC power supply；
The disjunction stage: when coil voltage detection module detects electromagnetic system voltage less than release voltage, turning off second switch pipe and the 4th switching tube, clamp circuit works, magnetizing coil demagnetizes rapidly, sound iron core drives dynamic/static contact sharp separation, and electric arc produces, and main contact electric current begins to decline；By the feedback quantity of contact current detection module, controlling the 3rd switching tube and turn at the expected value of contact electric current, the first inductance and electric capacity start resonance, and resonance current flows through main contact, superposes manufacture of intraocular current zero-crossing point, arc extinction with DC current；If now medium recovery strength is more than recovering voltage strength, then arc extinction will not be restriked, and then the 3rd switching tube is setting time point shutoff, Overvoltage suppressing and energy absorption loop works, prevents electronic component breakdown, absorbs the energy being stored in circuit simultaneously；If now medium recovery strength is less than recovering voltage strength, then electric arc is restriked；When capacitance voltage reaches reversed peak, resonance current is reverse, now diode is in forward bias conducting state, electric capacity, the second inductance, diode constitute resonance current negative half-cycle loop, it is to avoid resonance current forward flows through rated current that main contact causes main contact to undertake more than 2 times and aggravates arc burning and contact burning；When resonance current zero passage again, if electric arc does not also extinguish, then resonance current flows counterflow through main contact again, remanufactures artificial zero crossing；Resonant process has periodically, until arc extinction.
A kind of AC/DC universal intelligent contactor the most according to claim 1, it is characterised in that: when described second AC/DC power supply is for exchange, the work process of described AC/DC universal intelligent contactor includes the three below stage:
The adhesive stage: when coil voltage detection module detect electromagnetic system voltage in the range of adhesive, by the point of zero voltage of contact voltage detection module detection contact system the second AC/DC power supply, through Program time delay, magnetizing coil obtains electric, and starting process starts；The microprocessor feedback quantity by coil current detection module, sets PWM operating frequency and dutycycle and the reference value of exciting curent, thus controls electromagnetic system closed loop and start；After the intrinsic movement time of electromagnetic mechanism, dynamic and static contact is in the point of zero voltage region adhesive of the second AC/DC power supply, it is achieved no-voltage attracting process controls；
In the sticking stage: after attracting process terminates, AC/DC universal intelligent contactor proceeds to sticking and controls program；Reset PWM duty cycle, it is achieved closed-loop current control, maintain the most constant, in the range of magnetizing coil electric current is maintained a default low value of magnetizing coil electric current；
The disjunction stage: when coil voltage detection module detects electromagnetic system voltage less than release voltage, zero point by contact current detection module detection main contact electric current, through Program time delay, magnetizing coil power-off, clamp circuit works, and magnetizing coil demagnetizes rapidly, after the intrinsic movement time of mechanism, dynamic/static contact disconnects in the current zero region set, it is achieved zero-current-break control.
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| CN105895451B (en) | 2017-10-20 |
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