CN203386661U - Power saving AC contactor provided with threshold voltage - Google Patents

Abstract

Provided is a power saving AC contactor provided with a threshold voltage. The power saving AC contactor is composed of three parts, i.e., a first voltage controlled switch circuit, an energy storage circuit and a second voltage controlled switch circuit. The power saving AC contactor is characterized by comprising a four-port network; ports N1, N2 are input ports; ports P1, P2 are output ports; the input ports N1, N2 are respectively connected with the S1, S2 ends of an AC voltage; the output ports P1, P2 are respectively connected with the A1, A2 ends of an excitation coil L in a conventional AC contactor; the N1 port, the first voltage controlled switch circuit, the energy storage circuit, the second voltage controlled switch circuit and the N2 port are successively connected in series; the P1 port is led out from the connection position of the first voltage controlled switch circuit and the energy storage circuit; and the P2 port and the N2 port are connected.

Description

Be provided with the power-saving alternating-current contactor of threshold voltage

Technical field

The utility model relates to Low Voltage Electrical Apparatus, relates in particular to a kind of electricity saving function power-saving alternating-current contactor that is provided with threshold voltage that has.

Background technology

A.C. contactor is a kind of application low-voltage electrical apparatus very widely.Its operation principle is to utilize electromagnet drive moving contact (make contact) with fixed contact (break contact) closure or separate, and reaches the purpose that switches on or off circuit.It is applicable to starting or controls three phase induction motor and other power consumption equipment.

The fundamental diagram that Fig. 1 is traditional A.C. contactor.This traditional A.C. contactor mainly is comprised of moving iron core, static iron core, magnet exciting coil, back-moving spring, break contact, make contact.When magnet exciting coil is connected AC220V, AC110V or AC380V voltage (following common name AC220V, AC110V or AC380V are AC voltage or field power supply), the effect of the magnetic force that moving iron core is produced by magnet exciting coil and with the static iron core closure, also thereupon closed with the make contact of moving iron core interlock, external circuit is just connected by this make contact; When AC voltage on magnet exciting coil disconnects, moving iron core loss of excitation also is subject to the effect of back-moving spring and separates with static iron core, the make contact disconnection that resets, and external circuit just is cut off thereupon.

In sum, the course of work of this traditional A.C. contactor can be divided into " adhesive ", " sticking ", " resetting " three phases:

1, adhesive: magnet exciting coil and AC voltage are connected, dynamic and static iron core adhesive.In this stage, for overcoming

The inertia of moving iron core and the elastic force of back-moving spring, field power supply must provide larger power (being " adhesive power " hereinafter referred to as this power), the adhesive mutually of dynamic and static iron core ability;

2, sticking: magnet exciting coil continues to connect with AC voltage, and dynamic and static iron core continues to keep the state of adhesive.In this stage, field power supply need only provide less power (being " holding power " hereinafter referred to as this power), and dynamic and static iron core also can continue adhesive.If in this stage, field power supply provides excessive holding power, will cause waste of energy and cause A.C. contactor unnecessary heating up;

3, reset: magnet exciting coil disconnects AC voltage, the separation that " resets " of dynamic and static iron core.

The purposes of A.C. contactor varies, and structure also varies, but their operation principle is all identical with Fig. 1.

Traditional A.C. contactor is because adhesive all passes to identical AC voltage with in sticking stage magnet exciting coil,

Therefore there is following critical defect:

1, meaningless power consumption: front already described, in adhesive and sticking stage, all pass to " identical " AC voltage in the magnet exciting coil of traditional A.C. contactor, make holding power excessive, caused meaningless electric energy loss;

2, heating: the disastrous effect of meaningless electric energy loss institute association is " heating heats up ", when serious, even can burn the magnet exciting coil of traditional A.C. contactor;

3, the quality " with fortune " of adhesive action: connect the moment of AC voltage at magnet exciting coil, when the instantaneous value of AC voltage is higher, the powerful adhesive of described conventional AC contactor; On the contrary, described magnet exciting coil is connected the moment of AC voltage, when the instantaneous value of AC voltage is low, and the slow adhesive of described conventional AC contactor, in the case, its make contact or break contact just may seriously burn because striking sparks.

The critical defect existed for traditional A.C. contactor, the technical staff in electronics, electrical apparatus industry studies, has designed multiple " electricity-saving circuit ", " electricity-saving appliance ", " energy saving ac contactor " for improving traditional A.C. contactor performance." a kind of energy saving ac contactor " that " energy-saving alternating current contactor unit " that " high-effect energy-saving ac contactor " that Chinese Patent Application No. is 97216246.1, application number are 94202133.9, application number are 201010144412.4 discloses patent applicant's achievement in research separately; Hangzhou, Changzhou, Zhuhai Deng Di universities and colleges or manufacturer also are useful on " electricity-saving appliance " that improve conventional AC contactor performance and come out.

Above-mentioned prior art really, for improving the performance of conventional AC contactor, has been made useful exploration and has been obtained certain achievement, but the following defect of ubiquity:

1, complex structure, be difficult to carry out;

2, electronic device used is too many, and electronic circuit is too complicated; Adopt monolithic processor controlled " economizer of AC. contactor " to be subject to the electromagnetic interference of the electrical equipment such as A.C. contactor itself or motor and cause internal processes execution error, generation " flyer " mistake control-this mistake control can breed disaster in some occasion!

3, the product price that enforcement is produced is too high, and the price of the QXJB type economizer of AC. contactor that for example Zhuhai City, Guangdong Province Co., Ltd produces is up to 1500 yuan/platform! Just more than 20 yuan of the price of small-sized A.C. contactor, the price of medium-sized A.C. contactor also only has hundreds of unit, and so expensive " QXJB type economizer of AC. contactor " will make the user very few.

4, due to the electronic circuit complexity, electronic device used is many, and therefore, the economize on electricity of A.C. contactor is controlled part and is difficult to become one with A.C. contactor, and part is controlled in described economize on electricity must separately establish a box, causes user installation inconvenience, wiring trouble.

Have above defect just because of prior art, so following situation occurred: " China's electricity-saving type A.C. contactor has had certain market at present, but universal not enough, and traditional A.C. contactor is occupied an leading position at present on the user uses.Main cause is that the power-saving contactor price is more expensive, and the user can't accept on disposable input, awaits country and strengthen the policy dynamics in the popularization of energy-saving type contactor, promotes the extensive use of energy-saving type contactor ".(list of references 1: money Jinchuan etc. the alternating-current contactor energy-saving technology summary. the 4th phase of the market conditions .2011 of China Electronics).

For the present situation of prior art, the target that the utility model will reach is:

1, grasping the starting point of " to extremely letter of essence; have simple and practical ability only and spread for a long time ", " application electric technology; rebuild traditional industry ", design a kind of electronic circuit as far as possible simple, used device try one's best honest and clean, the performance of few, price of trying one's best surpass " power save unit " of power-saving alternating-current contactor special use prior art, " to essence to letter ";

2, should " power save unit " to essence to letter can be used for transforming the conventional AC contactor of online use, and make these A.C. contactor upgradings become " electricity-saving type A.C. contactor ";

3, should also can be integrated in the conventional AC contactor that will produce to " power save unit " of essence to letter, the manufacturer of A.C. contactor is produced and " power save unit " integrated novel " power-saving alternating-current contactor ".

The utility model content

In order to reach above-mentioned target, the technical scheme of the utility model design is: a kind of power-saving alternating-current contactor that is provided with threshold voltage, by the first pressuring controling switch circuit, accumulator and the second pressuring controling switch circuit three parts, formed, be characterised in that: it is four port networks, port N1, N2 are its input port, and port P1, P2 are its output port; Input port N1, N2 are connected with S1, the S2 of AC voltage end respectively, and output port P1, P2 hold and are connected with A1, the A2 of magnet exciting coil L in the conventional AC contactor respectively; And described the first pressuring controling switch circuit, accumulator, the second pressuring controling switch circuit can form described four port networks by following three kinds of methods:

(a) N1 end, the first pressuring controling switch circuit, accumulator, the second pressuring controling switch circuit, the series connection successively of N2 end, the P1 end is drawn from the junction of the first pressuring controling switch circuit and accumulator, and the P2 end is drawn from the junction of accumulator and the second pressuring controling switch circuit;

(b) N1 end, the first pressuring controling switch circuit, the second pressuring controling switch circuit, accumulator, the series connection successively of N2 end, the P1 end is drawn from the junction of the second pressuring controling switch circuit and accumulator, and the P2 end is connected with the N2 end;

(c) N1 end, accumulator, the first pressuring controling switch circuit, the second pressuring controling switch circuit, the series connection successively of N2 end, the P1 end is connected with the N1 end, and the P2 end is drawn from the junction of accumulator and the first pressuring controling switch circuit.

The S1 of described AC voltage end, S2 end can the reciprocity connectivity ports, and the A1 end of described magnet exciting coil, the A2 end also can the reciprocity connectivity port.

The power save unit of A.C. contactor described in the utility model combines with the conventional AC contactor, can form novel electricity-saving type A.C. contactor.

Described the first pressuring controling switch circuit by monopole type transient voltage suppressor diode TVS1 form, accumulator by capacitor C form, the second pressuring controling switch circuit is comprised of monopole type transient voltage suppressor diode TVS2.

The circuit structure of the power save unit of described A.C. contactor is:

(a) negative pole of monopole type transient voltage suppressor diode TVS1 connects the N1 end of described four port networks, the P1 end that positive pole connects four port networks; One end of capacitor C also connects described P1 end, the P2 end of described four port networks of another termination; The positive pole of monopole type transient voltage suppressor diode TVS2 also connects described P2 end, and negative pole connects described four port network N2 ends;

Be perhaps (b): an end of the positive pole of described N1 end, monopole type transient voltage suppressor diode TVS1, the negative pole of TVS1, P1 end, capacitor C, the other end of capacitor C, P2 end, the negative pole of monopole type transient voltage suppressor diode TVS2, the positive pole of TVS2, N2 end are in series successively and form the power save unit of described A.C. contactor;

Be perhaps (c): the positive pole of the negative pole of described N1 end, monopole type transient voltage suppressor diode TVS1, the positive pole of TVS1, monopole type transient voltage suppressor diode TVS2, the negative pole of TVS2, P1 end, an end of capacitor C, the other end of capacitor C, P2 end, N2 end are in series successively and form the power save unit of described A.C. contactor;

Be perhaps (d): the negative pole of the positive pole of described N1 end, monopole type transient voltage suppressor diode TVS1, the negative pole of TVS1, monopole type transient voltage suppressor diode TVS2, the positive pole of TVS2, P1 end, an end of capacitor C, the other end of capacitor C, P2 end, N2 end are in series successively and form the power save unit of described A.C. contactor;

Be perhaps (e): the negative pole of an end of described N1 end, P1 end, capacitor C, the other end of capacitor C, P2 end, monopole type transient voltage suppressor diode TVS1, the positive pole of TVS1, the positive pole of monopole type transient voltage suppressor diode TVS2, the negative pole of TVS2, N2 end are in series successively and form the power save unit of described A.C. contactor;

Be perhaps (f): the positive pole of an end of described N1 end, P1 end, capacitor C, the other end of capacitor C, P2 end, monopole type transient voltage suppressor diode TVS1, the negative pole of TVS1, the negative pole of monopole type transient voltage suppressor diode TVS2, the positive pole of TVS2, N2 end are in series successively and form the power save unit of described A.C. contactor.

The common trait of the power save unit of the A.C. contactor of above-mentioned multiple circuit structure is; By forming after monopole type transient voltage suppressor diode TVS1, monopole type transient voltage suppressor diode TVS2, three electronic component series connection of capacitor C, its output P1 all draws from an end of capacitor C, and another output P2 all draws from the other end of capacitor C.

Described monopole type transient voltage suppressor diode can substitute with ambipolar transient voltage suppressor diode, piezo-resistance or voltage stabilizing didoe.

The long operation result of theory analysis and experimental prototype (the utility model only has three electronic components, and model machine is easy to do) all proves that application the utility model can be obtained following beneficial effect:

1, inexpensive: in the utility model for improvement of conventional AC contactor performance to the essence to the letter " power save unit ", monopole type transient voltage suppressor diode TVS1, monopole type transient voltage suppressor diode TVS2, three electronic components of capacitor C are only arranged, and total cost is less than 0.4 yuan.Only spend 0.4 yuan, just can make the conventional AC contactor be promoted to " the electricity-saving type A.C. contactor " of premium properties, solved the problem that list of references 1 discloses: " China's electricity-saving type A.C. contactor has had certain market at present; but universal not enough, traditional A.C. contactor is occupied an leading position at present on the user uses.Main cause is that the power-saving contactor price is more expensive, the user can't accept on disposable input, await country and strengthen the policy dynamics in the popularization of energy-saving type contactor, promote the extensive use of energy-saving type contactor ", for electricity-saving type A.C. contactor spread has been created condition;

2, thing U.S.: the volume of above-mentioned three electronic components is all fine, they can be integrated into to the inside of conventional AC contactor, manufactures the electricity-saving type A.C. contactor integrated, that outward appearance is pleasing.This point, prior art all too far behind to catch up, be difficult to accomplish;

3, reliable: the quantity of the reliability of electronic product and electronic device used is inversely proportional to, price and used

The quantity of electronic device be directly proportional.Electronic device used is more, and electronic circuit is more complicated, just means that reliability is lower, price is higher.The utility model is only used three electronic devices, and is all the power-type device of not being afraid of electromagnetic interference that forceful electric power is used, and therefore, not only cost is low, and reliability is high;

4, lengthen the life: a traditional CJX2 A.C. contactor, a CJX2 A.C. contactor with " power save unit " of the present utility model transformation, after the same place that is 34 ° of C in room temperature is moved 10 hours simultaneously, the temperature on the former surface has surpassed 50 ° of C, touches scalding one's hand; The latter, the temperature on surface is still room temperature.Temperature rise is the formidable enemy of electronics, electric equipment products, and temperature rise is higher, and the useful life of product is just shorter, otherwise just can extend useful life.Therefore, the utlity model has and extend product " lengthening the life " function in useful life;

5, quick: the utility model is provided with " threshold voltage ", and AC voltage is greater than " threshold voltage ", " pick-up voltage " when enough high, and A.C. contactor is just done the adhesive action.Therefore, the utility model adhesive action is strong and powerful, clear, sucting speed is fast.The advantage of the utility model quick pick-up, can reduce contact electric arc, prevent that contact from burning inefficacy, to the protection contact, extend the contactor life-span and there is important effect.

6, economize on electricity: temperature rise is low, is the visualize of economize on electricity, and measured result also shows, electric energy of the present utility model is greater than 80 ℅.

7, material-saving: choose the value of suitable capacitor C, both can reduce the number of turns of magnet exciting coil L, can guarantee electricity saving performance again.Bring into play this advantage of the present utility model, just can make A.C. contactor reduce the consumption of expensive enamel covered wire.

The accompanying drawing explanation

The fundamental diagram that Fig. 1 is A.C. contactor;

The functional-block diagram that Fig. 2 is embodiment 1, embodiment 2;

The circuit theory diagrams that Fig. 3 is embodiment 1;

The circuit theory diagrams that Fig. 4 is embodiment 2;

The functional-block diagram that Fig. 5 is embodiment 3, embodiment 4;

The circuit theory diagrams that Fig. 6 is embodiment 3;

The circuit theory diagrams that Fig. 7 is embodiment 4;

The functional-block diagram that Fig. 8 is embodiment 5, embodiment 6;

The circuit theory diagrams that Fig. 9 is embodiment 5;

The circuit theory diagrams that Figure 10 is embodiment 6:

The oscillogram that Figure 11 is AC voltage and damped oscillation voltage U C.

Embodiment

Below in conjunction with accompanying drawing, execution mode of the present utility model is described.

The embodiment 1 that Fig. 2 is the utility model, the functional-block diagram of embodiment 2, the circuit theory diagrams that Fig. 3 is embodiment 1.In Fig. 2, Fig. 3: dashed rectangle 100 means that the utility model are the power save unit (hereinafter to be referred as " power save unit ") of A.C. contactor, and it is that to have two inputs be that N1 is four port networks that P1 and P2 hold with N2 end, two outputs; In described power save unit 100 101 is that the first pressuring controling switch circuit, 102 is that accumulator, 103 is that the second pressuring controling switch circuit, L are the magnet exciting coil in the conventional AC contactor, two connectivity ports that A1, A2 are it.

In conjunction with Fig. 2; N1 end, the first pressuring controling switch circuit 101, accumulator 102, the second pressuring controling switch circuit 103, N2 end are composed in series described power save unit 100 successively, and its P1 end is drawn from the first pressuring controling switch circuit 101 and the junction of accumulator 102, the P2 end is drawn from the junction of accumulator 102 and the second pressuring controling switch circuit 103; Input port N1, N2 are connected with S1, the S2 end of AC voltage respectively, and output port P1, P2 are connected with A1, the A2 end of magnet exciting coil L respectively.

The S1 of described AC voltage end, S2 end can the reciprocity connectivity ports, and the A1 end of described magnet exciting coil, the A2 end also can the reciprocity connectivity port.

Power save unit 100 described in the utility model combines with the conventional AC contactor, can form novel electricity-saving type A.C. contactor.

Again in conjunction with Fig. 2, Fig. 3: the first pressuring controling switch circuit 101 by monopole type transient voltage suppressor diode TVS1 form, accumulator 102 by capacitor C form, the second pressuring controling switch circuit 103 is comprised of monopole type transient voltage suppressor diode TVS2.

The circuit structure of the present embodiment 1 is: the output P1 end that the input N1 end of the negative pole termination power save unit 100 of monopole type transient voltage suppressor diode TVS1, positive pole connect power save unit 100; One end of capacitor C also connects the output P1 end of power save unit 100, the output P2 end of another termination power save unit 100; The positive pole of monopole type transient voltage suppressor diode TVS2 also connects described P2 end, and negative pole connects the input N2 end of power save unit 100.

Set forth the course of work of the present embodiment 1 below in conjunction with accompanying drawing:

In conjunction with Fig. 2, Fig. 3, Figure 11: from the mathematic(al) representation of the AC voltage of S1, S2 end input be:

u=UmSin（2πft＋φ）

In above formula: the instantaneous value that u is AC voltage, the amplitude that Um is AC voltage, the frequency that f is AC voltage, the initial phase angle that φ is AC voltage.

For concise explanation, now suppose initial phase angle φ=0, the expression formula of the instantaneous value u of AC voltage is:

u=UmSin2πft

Its waveform as shown in figure 11.In figure: t means the time.

During t=t1, AC voltage is connected, and now, before the connection of AC voltage, capacitor C and magnet exciting coil L electric discharge all finish, therefore the voltage at capacitor C two ends (being the output voltage of power save unit 100) UC=0; At this t=t1 constantly: monopole type transient voltage suppressor diode TVS1 reverse bias, monopole type transient voltage suppressor diode TVS2 forward bias, the instantaneous value of AC voltage:

u1＝UmSin2πft1＜UT1

The reverse breakdown voltage that in above formula, UT1 is monopole type transient voltage suppressor diode TVS1.Because u1=UmSin2 π ft1<UT1 event monopole type transient voltage suppressor diode TVS1 is equivalent to open circuit, the output voltage U C=0 of power save unit 100, not adhesive of A.C. contactor.

In conjunction with Fig. 1, the professional and technical personnel should be clear: upper if the instantaneous value u1=UmSin2 π ft1 of AC voltage by t=t1 constantly directly is applied to magnet exciting coil L, may produce one of following bad phenomenon:

1, the value of u1 is too low, and its magnetic force produced is less than the elastic force of back-moving spring F, A.C. contactor power consumption and not adhesive in vain;

2, the value of u1 is large not, and its magnetic force produced only is slightly larger than the elastic force of back-moving spring F, and A.C. contactor is adhesive reluctantly and feebly, and its contact is because of the long scaling loss that subjects to of sparking time.

Above-mentioned phenomenon is one of shortcoming of conventional AC contactor.

In the time domain of t1～t10, the AC voltage grading, monopole type transient voltage suppressor diode TVS1 continues to end not conducting, still not adhesive of A.C. contactor.

In the time domain of t10～t2, monopole type transient voltage suppressor diode TVS1 forward bias, monopole type transient voltage suppressor diode TVS2 reverse bias.In this time domain, the value of AC voltage all is less than the reverse breakdown voltage UT2 of monopole type transient voltage suppressor diode TVS2, therefore monopole type transient voltage suppressor diode TVS2 is equivalent to open circuit, and the output voltage U C=0 of power save unit 100, still not adhesive of A.C. contactor.

During t=t2, the instantaneous value of AC voltage: u2=UmSin2 π ft2 >=UT2, monopole type transient voltage suppressor diode TVS2 punctures conducting, is equivalent to short circuit.AC voltage charges to capacitor C and makes the powerful adhesive of A.C. contactor and enter the sticking state.

Analyze so far, can reach a conclusion: the random AC voltages of connecting of 100 pairs of power save unit have the function of automatic discriminating: when the instantaneous value u=UmSin2 of AC voltage π ft<UT1 or u=UmSin2 π ft<UT2, the voltage U C=0 of described power save unit 100 outputs, not adhesive of A.C. contactor; When the instantaneous value u=UmSin2 of AC voltage π ft >=UT1 or u=UmSin2 π ft >=UT2,, the powerful adhesive of A.C. contactor.

Therefore, as long as select the value (being called for short UT1 or UT2 is " threshold voltage ") of sufficiently high UT1 and UT2, AC voltage just can provide larger " adhesive power ", can guarantee that the A.C. contactor adhesive is strong and powerful.

In other words: as long as select the sufficiently high monopole type transient voltage suppressor diode of reverse breakdown voltage TVS1, TVS2 to form power save unit 100, just can guarantee A.C. contactor strong and powerful ground adhesive when AC voltage is enough high.

In brief: when AC voltage is greater than " threshold voltage ", can guarantee the adhesive of strong and powerful ground of A.C. contactor.

In other words: the utility model is provided with " threshold voltage ", and when AC voltage is greater than " threshold voltage ", A.C. contactor is just done the adhesive action.

Be provided with threshold voltage, can guarantee that the A.C. contactor adhesive is strong and powerful, clear, sucting speed is fast.The characteristics of the utility model quick pick-up, can reduce contact electric arc, prevent that contact from burning inefficacy, to the protection contact, extend the contactor life-span and there is important effect, be one of significant advantage of the utility model.

During t=t3, the voltage at capacitor C two ends is charged to UC3, and the voltage at monopole type transient voltage suppressor diode TVS2 two ends is that UmSin2 π ft3-UC3<UT2 makes its shutoff, it is equivalent to open circuit.

In the time domain of t3～t20, because capacitor C and magnet exciting coil L all contain electric energy, therefore, they make Figure 11 represented " damped oscillation " (envelope that in figure, E1, E2 are damped oscillation), and its cycle T b, frequency f b are respectively:

Tb＝2 fb＝1／T＝1╱2

A.C. contactor relies on this damped oscillation and maintains the sticking state.

Analyze so far, can draw to draw a conclusion:

1, the electrical quantity of capacitor C and magnet exciting coil L has determined the slope of damped oscillation frequency f b and damped oscillation envelope.When magnet exciting coil L is the situation of definite value, can, by adjusting the value of capacitor C, make the slope of damped oscillation frequency f b and damped oscillation envelope be the optimum value that electric energy is the highest;

2, reduce the number of turns of magnet exciting coil L, choose the value of suitable capacitor C, also can make the utility model enter the state that economize on electricity is best.

In brief: choose the value of suitable capacitor C, can reduce the number of turns of magnet exciting coil L.

This is one of important advantage of the utility model, and experimental prototype of the present utility model proves: application the utility model, the number of turns of the magnet exciting coil L of conventional AC contactor is reduced to 200 circles, and application the utility model, still can obtain and be greater than 70% electric energy.Bring into play this advantage of the present utility model, just can make A.C. contactor reduce the consumption of expensive enamel covered wire.

In the time domain of t20～t4, monopole type transient voltage suppressor diode TVS1 reverse bias, monopole type transient voltage suppressor diode TVS2 forward bias, the value of AC voltage is less than UT1, therefore monopole type transient voltage suppressor diode TVS1 equivalence open circuit, capacitor C and magnet exciting coil L continue damped oscillation, and A.C. contactor continues to maintain the sticking state.

During t=t4, the voltage U c=uc4 at capacitor C two ends,

The instantaneous value u4=UmSin2 π ft4 of AC voltage,

Now, the voltage at monopole type transient voltage suppressor diode TVS1 two ends is:

u4—Uc＝UmSin2πft4—uc4≥UT1

Therefore monopole type transient voltage suppressor diode TVS1 reverse breakdown, equivalent short circuit, AC voltage charges to capacitor C.

During t=t5, the voltage U c=uc5 at capacitor C two ends

The instantaneous value u5=UmSin2 π ft5 of AC voltage

Now, the voltage at monopole type transient voltage suppressor diode TVS1 two ends is:

u5—Uc＝UmSin2πft5—uc5＜UT1

Therefore monopole type transient voltage suppressor diode TVS1 cut-off, the equivalence open circuit, capacitor C and magnet exciting coil L damped oscillation, A.C. contactor continues to maintain the sticking state.

In the time domain of t5～t30, capacitor C and magnet exciting coil L continue damped oscillation, and A.C. contactor continues to maintain the sticking state.

In the time domain of t30～t6, monopole type transient voltage suppressor diode TVS1 forward bias, monopole type transient voltage suppressor diode TVS2 reverse bias, the value of AC voltage is less than UT2, therefore monopole type transient voltage suppressor diode TVS2 equivalence open circuit, capacitor C and magnet exciting coil L continue damped oscillation, and A.C. contactor continues to maintain the sticking state.

During t=t6, the voltage U c=uc6 at capacitor C two ends

The instantaneous value u6=UmSin2 π ft6 of AC voltage

Now, the voltage at monopole type transient voltage suppressor diode TVS2 two ends is:

u6—Uc＝UmSin2πft6—uc6≥UT2

Therefore monopole type transient voltage suppressor diode TVS2 reverse breakdown, equivalent short circuit, AC voltage charges to capacitor C.

The repetition so gone round and begun again, can maintain the sticking state of A.C. contactor.

In conjunction with Figure 11, can draw to draw a conclusion again:

1, the conventional AC contactor all is connected with AC voltage (or claiming the energising of full-time territory) at the sticking state, and the holding power that AC voltage provides is excessive, will cause waste of energy and cause A.C. contactor unnecessary heating up;

2, in the utility model, AC voltage is only in the local time domain of monopole type transient voltage suppressor diode TVS1 or monopole type transient voltage suppressor diode TVS2 short circuit conducting, and for example the time domain (being the time domain that the angle of flow is Q3) of the time domain (being the time domain that the angle of flow is Q2) of the time domain of t2～t3 (being the time domain that the angle of flow is Q1), t4～t5, t6～t7 is to capacitor C and magnet exciting coil L energising energy storage;

In brief: AC voltage is in the time domain of monopole type transient voltage suppressor diode TVS1 or TVS2 short circuit conducting, to capacitor C and magnet exciting coil L energising energy storage.

3, the reverse voltage at monopole type transient voltage suppressor diode TVS1 two ends is greater than its reverse breakdown voltage UT1(or claims threshold voltage UT1) time, its equivalent short circuit, AC voltage for example, to capacitor C charging (time domain that the angle of flow is Q2).

In brief: when the reverse voltage at monopole type transient voltage suppressor diode TVS1 two ends is greater than its threshold voltage UT1, AC voltage charges to capacitor C.

4, the reverse voltage at monopole type transient voltage suppressor diode TVS2 two ends is greater than its reverse breakdown voltage UT2(or claims threshold voltage UT2) time, its equivalent short circuit, AC voltage for example, to capacitor C charging (time domain that the angle of flow is Q1, Q3).

In brief: when the reverse voltage at monopole type transient voltage suppressor diode TVS2 two ends is greater than its threshold voltage UT2, AC voltage charges to capacitor C.

Adopting the technology of " local time domain energising ", is one of the utility model economize on electricity mechanism.

The circuit theory diagrams that Fig. 4 is embodiment 2.With embodiment 1, compare, the present embodiment has changed the polarity of monopole type transient voltage suppressor diode TVS1 and TVS2, becomes following method and connects: an end of the positive pole of described N1 end, monopole type transient voltage suppressor diode TVS1, the negative pole of TVS1, P1 end, capacitor C, the other end of capacitor C, P2 end, the negative pole of monopole type transient voltage suppressor diode TVS2, the positive pole of TVS2, N2 end are composed in series described power save unit 100 successively.After having done such change, its operation principle and the course of work are still identical with embodiment 1.

The functional-block diagram that Fig. 5 is embodiment 3, embodiment 4, in figure: described the first pressuring controling switch circuit 101, the second pressuring controling switch circuit 103, accumulator 102 form described power save unit 100:N1 end, the first pressuring controling switch circuit 101, the second pressuring controling switch circuit 103, accumulator 102, the series connection successively of N2 end as follows, the P1 end is drawn from the second pressuring controling switch circuit 103 and the junction of accumulator 102, and the P2 end is connected with the N2 end;

The feature of above-mentioned method of attachment is: described A2 holds, P2 holds, N2 holds, the S2 end all is connected to each other, and becomes for ease of connection or is convenient to integrated common port.

The circuit theory diagrams that Fig. 6 is embodiment 3, with embodiment 1, compare, the present embodiment has changed the position of monopole type transient voltage suppressor diode TVS2, described TVS1, TVS2 become the connection of " back-to-back " that be connected for positive pole, become following method and connect: the positive pole of the negative pole of described N1 end, monopole type transient voltage suppressor diode TVS1, the positive pole of TVS1, monopole type transient voltage suppressor diode TVS2, the negative pole of TVS2, P1 end, an end of capacitor C, the other end of capacitor C, P2 end, N2 end are composed in series described power save unit 100 successively.After having done such change, its operation principle and the course of work are still identical with embodiment 1.

The circuit theory diagrams that Fig. 7 is embodiment 4, with embodiment 1, compare, the present embodiment has changed the position of monopole type transient voltage suppressor diode TVS2, described TVS1, TVS2 become the connection of " face-to-face " that be connected for negative pole, become following method and connect: the negative pole of the positive pole of described N1 end, monopole type transient voltage suppressor diode TVS1, the negative pole of TVS1, monopole type transient voltage suppressor diode TVS2, the positive pole of TVS2, P1 end, an end of capacitor C, the other end of capacitor C, P2 end, N2 end are composed in series described power save unit 100 successively.After having done such change, its operation principle and the course of work are still identical with embodiment 1.

The functional-block diagram that Fig. 8 is embodiment 5, embodiment 6, in figure: described the first pressuring controling switch circuit 101, the second pressuring controling switch circuit 103, accumulator 102 form described power save unit 100:N1 end, accumulator 102, the first pressuring controling switch circuit 101, the second pressuring controling switch circuit 103, the series connection successively of N2 end as follows, the P1 end is connected with the N1 end, and the P2 end is drawn from the junction of accumulator 102 and the first pressuring controling switch circuit 101.

The feature of above-mentioned method of attachment is: described S1 holds, N1 holds, P1 holds, the A1 end all is connected to each other, and becomes for ease of connection or is convenient to integrated common port.

The circuit theory diagrams that Fig. 9 is embodiment 5, with embodiment 1, compare, the present embodiment has changed the position of monopole type transient voltage suppressor diode TVS1, described TVS1, TVS2 become the connection of " back-to-back " that be connected for positive pole, become following method and connect: the negative pole of an end of described N1 end, P1 end, capacitor C, the other end of capacitor C, P2 end, monopole type transient voltage suppressor diode TVS1, the positive pole of TVS1, the positive pole of monopole type transient voltage suppressor diode TVS2, the negative pole of TVS2, N2 end are composed in series described power save unit 100 successively.After having done such change, its operation principle and the course of work are still identical with embodiment 1.

The circuit theory diagrams that Figure 10 is embodiment 6, with embodiment 1, compare, the present embodiment has changed the position of monopole type transient voltage suppressor diode TVS1, described TVS1, TVS2 become the connection of " face-to-face " that be connected for negative pole, become following method and connect: the positive pole of an end of described N1 end, P1 end, capacitor C, the other end of capacitor C, P2 end, monopole type transient voltage suppressor diode TVS1, the negative pole of TVS1, the negative pole of monopole type transient voltage suppressor diode TVS2, the positive pole of TVS2, N2 end are composed in series described power save unit 100 successively.After having done such change, its operation principle and the course of work are still identical with embodiment 1.

The common trait of above-described embodiment is; Described power save unit 100 is by monopole type transient voltage suppressor diode TVS1, monopole type transient voltage suppressor diode TVS2, three rear compositions of electronics series connection of capacitor C, its output P1 all draws from an end of capacitor C, and another output P2 all draws from the other end of capacitor C.

It will be apparent to those skilled in the art: described monopole type transient voltage suppressor diode can substitute with ambipolar transient voltage suppressor diode, piezo-resistance or voltage stabilizing didoe.

More than set forth the technical solution of the utility model, all technology that do not break away from the essence of the technical solution of the utility model substitute, all should be in the scope of claim of the present utility model.

Claims (2)

1. a power-saving alternating-current contactor that is provided with threshold voltage, by the first pressuring controling switch circuit, accumulator and the second pressuring controling switch circuit three parts, formed, be characterised in that: the described power-saving alternating-current contactor that is provided with threshold voltage is four port networks, has first input end mouth (N1), the second input port (N2), the first output port (P1) and the second output port (P2); First input end mouth (N1), the second input port (N2) are connected with the second end (S2) with the first end (S1) of AC voltage respectively, and the first output port (P1) is connected with the second end (A2) with the first end (A1) of magnet exciting coil (L) respectively with the second output port (P2);

Wherein, first input end mouth (N1), the first pressuring controling switch circuit, the second pressuring controling switch circuit, accumulator, the second input port (N2) are connected successively, the first output port (P1) is drawn from the junction of the second pressuring controling switch circuit and accumulator, and the second output port (P2) is connected with the second input port (N2);

Wherein, the second end (A2) common-battery position of second end (S2) of AC voltage, the second input port (N2), the second output port (P2) and magnet exciting coil (L).

2. the power-saving alternating-current contactor that is provided with threshold voltage as claimed in claim 1 is characterized in that:

The first pressuring controling switch circuit by the first monopole type transient voltage suppressor diode (TVS1) form, accumulator by electric capacity (C) form, the second pressuring controling switch circuit is comprised of the second monopole type transient voltage suppressor diode (TVS2);

Wherein, described first input end mouth (N1) connects the negative pole of the first monopole type transient voltage suppressor diode (TVS1), the positive pole of the first monopole type transient voltage suppressor diode (TVS1) connects the positive pole of the second monopole type transient voltage suppressor diode (TVS2), the negative pole of the second monopole type transient voltage suppressor diode (TVS2) connects an end of the first output port (P1) and electric capacity (C), the other end of electric capacity (C) connects the second end (S2) with AC voltage, the second input port (N2), the second end (A2) common-battery position of the second output port (P2) and magnet exciting coil (L).

Images