CN103413727B

CN103413727B - A.C. contactor

Info

Publication number: CN103413727B
Application number: CN201310340519.XA
Authority: CN
Inventors: 汪孟金
Original assignee: Ningbo Zhenhai Huatai Electric Factory
Current assignee: Ningbo Yinzhou Electric Power Equipment Manufactory Co ltd; Yinzhou Electric Branch Of Ningbo Yongneng Electric Power Industry Investment Co ltd; Ningbo Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Priority date: 2013-08-06
Filing date: 2013-08-06
Publication date: 2015-08-12
Anticipated expiration: 2033-08-06
Also published as: CN103413727A

Abstract

The invention discloses a kind of not only economize on electricity but also the quiet A.C. contactor without making an uproar, comprise conventional AC contactor and economize on electricity muting unit two parts, described threshold control circuit is made up of piezo-resistance (VDR1), and described accumulator is made up of electric capacity (C).

Description

A.C. contactor

Technical field

The present invention relates to Low Voltage Electrical Apparatus, particularly relate to a kind of A.C. contactor having economize on electricity and noise elimination function concurrently.

Background technology

A.C. contactor is a kind of application low-voltage electrical apparatus widely, and end 2012, the A.C. contactor of China's on-line operation reaches 1,000,000,000, and to increase the speed increase of 8,000 ten thousand every year newly.Its operation principle utilizes electromagnet to drive moving contact (make contact) close with fixed contact (break contact) or be separated, and reaches the object switching on or off circuit.It is applicable to start or control three phase induction motor and other power consumption equipment.

Fig. 1 is the fundamental diagram of traditional A.C. contactor.This traditional A.C. contactor is primarily of dynamic iron core, static iron core, magnet exciting coil, back-moving spring, break contact, make contact composition.When magnet exciting coil connects AC220V, AC110V or AC380V voltage (being generally called AC220V, AC110V or AC380V is below AC voltage or field power supply), dynamic iron core closes with static iron core by the effect of the magnetic force of magnet exciting coil generation, the make contact linked with dynamic iron core also closes thereupon, and external circuit is just connected by this make contact; When the AC voltage on magnet exciting coil disconnects, dynamic iron core loss of excitation is also separated with static iron core by the effect of back-moving spring, and make contact resets and disconnects, and external circuit is just cut off thereupon.

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

1, adhesive: magnet exciting coil and AC Voltage On state, dynamic and static iron core adhesive.In this stage, for overcoming

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

2, sticking: magnet exciting coil continues and AC Voltage On state, dynamic and static iron core continues the state keeping adhesive.In this stage, field power supply need only provide less power (be " 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, dynamic and static iron core " reset " is separated.

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 all passes to identical AC voltage with sticking stage magnet exciting coil due to adhesive,

Therefore there is following critical defect:

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

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

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

4, there is annoying AC noise;

5, power factor (PF) is low.

For the critical defect that traditional A.C. contactor exists, the technical staff in electronics, electrical apparatus industry studying, devising multiple " electricity-saving circuit ", " electricity-saving appliance ", " energy saving ac contactor " for improving traditional A.C. contactor performance." 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 be 201010144412.4 " a kind of energy saving ac contactor " disclose patent applicant's achievement in research separately; Universities and colleges or the manufacturer on the ground such as Hangzhou, Changzhou, Zhuhai also have " electricity-saving appliance " for improving conventional AC contactor performance to come out.

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

1, complex structure, is difficult to carry out;

2, electronic device used is too many, and electronic circuit is too complicated; Adopt monolithic processor controlled " ac contactor

Device electricity-saving appliance " be then 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 " control by mistake-this mistake control can breed disaster in some occasion!

The product price of 3, implementing to produce is too high, and the price of the QXJB type economizer of AC. contactor that such as Zhuhai City, Guangdong Province Co., Ltd produces is up to 1500 yuan/platform! The price of small-sized A.C. contactor just more than 20 yuan, 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 user very few.

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

5, because electronic circuit is complicated, electronic device used is many, therefore, the power consumption (AC-DC transition loss, IC power consumption, actuator power consumption etc.) of the economize on electricity control part self of A.C. contactor will increase, and what have is even large to the stage comparable with the holding power of small-size contactor.

Above defect is there is, so there is following situation: " current China electricity-saving type A.C. contactor has had certain market, but universal not enough, and traditional A.C. contactor is occupied an leading position at present on user uses just because of prior art.Main cause is that power-saving contactor price is more expensive, and user can't accept in disposable input, awaits country's increasing 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. alternating-current contactor energy-saving technology summary. China Electronics market conditions .2011 the 4th phase)

For the present situation of prior art, the present invention want Da to target be:

1, the aim of " must to letter to essence; have simple and practical ability only and spread for a long time " and " not best; to only have better " is grasped, " application electric technology; rebuild traditional industry ", design a kind of electronic circuit as far as possible device simple, used as far as possible few, price as far as possible honest and clean, performance exceed prior art, " economize on electricity muting unit " that the economize on electricity noise elimination A.C. contactor of " to essence to letter " is special;

2, should can be used for transforming the online conventional AC contactor used to essence to " the economize on electricity muting unit " of letter, these A.C. contactors are upgraded to be become " not only economize on electricity but also the quiet A.C. contactor without making an uproar ";

3, should to essence to " the economize on electricity muting unit " of letter also accessible site in the conventional AC contactor that will produce, the manufacturer of A.C. contactor is produced integrated with " economize on electricity muting unit " novel " not only economize on electricity but also the A.C. contactor that quiet nothing is made an uproar ".

Summary of the invention

A kind ofly not only to economize on electricity but also the quiet A.C. contactor without making an uproar, comprise economize on electricity muting unit and conventional AC contactor two part be made up of break contact, make contact, dynamic iron core, static iron core, back-moving spring, magnet exciting coil L, it is characterized in that: described economize on electricity muting unit has N1, N2, P1, P2 tetra-ports, is four port networks; Port N1, N2 are two input port, and P1, P2 are two output port; Its input port N1, N2 hold with S1, S2 of AC voltage respectively and are connected, and output port P1, P2 hold with A1, A2 of described magnet exciting coil L respectively and be connected; Its structure is:

A (), described economize on electricity muting unit are held be composed in series successively by N1 end, threshold control circuit, P1 end, accumulator, P2 end, N2;

Or be: (b), described economize on electricity muting unit are held be composed in series successively by N1 end, P1 end, accumulator, P2 end, threshold control circuit, N2.

Described economize on electricity muting unit and conventional AC contactor are combined by described mode, can form novel " not only economize on electricity but also the quiet A.C. contactor without making an uproar ".

Described economize on electricity muting unit has to the random AC voltage connected the function automatically differentiated: when the instantaneous value of AC voltage is less than the threshold voltage of described threshold control circuit, A.C. contactor not adhesive; Otherwise, when the instantaneous value of AC voltage be greater than described threshold voltage, its adhesive power provided enough large time, A.C. contactor just powerful adhesive.

Described threshold control circuit is made up of piezo-resistance VDR1, accumulator is made up of electric capacity C.

The circuit structure of described economize on electricity muting unit is:

A economize on electricity muting unit that (), N1 end, piezo-resistance VDR1, P1 end, electric capacity C, P2 end, N2 end are in series namely described in composition successively;

Or for: the economize on electricity muting unit that (b), N1 end, P1 end, electric capacity C, P2 end, piezo-resistance VDR1, N2 end are in series namely described in composition successively.

The common trait of the economize on electricity muting unit of above-mentioned two kinds of circuit structures is;

A (), electric capacity C and magnet exciting coil L are in parallel, after their parallel connections, one end connects output P1 end, and the other end connects output P2 end;

B (), threshold voltage control conducting or the cut-off of piezo-resistance VDR1: when the voltage at piezo-resistance VDR1 two ends is greater than its threshold voltage, its conducting; Otherwise, when the voltage at piezo-resistance VDR1 two ends is less than its threshold voltage, its cut-off;

During piezo-resistance VDR1 conducting described in (c), electric capacity C charging energy-storing; Otherwise during piezo-resistance VDR1 cut-off, described electric capacity C and described magnet exciting coil L complementation is discharged.

Application the present invention, can obtain following beneficial effect:

1, inexpensive: for improvement of " the economize on electricity muting unit " to essence to letter of conventional AC contactor performance in the present invention, only have piezo-resistance VDR1, electric capacity C bis-electronic components, total cost is less than 0.3 yuan.Only spend 0.3 yuan, conventional AC contactor just can be made to be promoted to premium properties " not only having economized on electricity but also the quiet A.C. contactor without making an uproar ", solve the problem that list of references 1 discloses: " current China electricity-saving type A.C. contactor has had certain market; but universal not enough, traditional A.C. contactor is occupied an leading position at present on user uses.Main cause is that power-saving contactor price is more expensive, user can't accept in disposable input, await country's increasing 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 creates condition;

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

3, reliable: the reliability of electronic product and the quantity of electronic device used are 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 present invention only uses two electronic devices, and is all the power-type device not being afraid of electromagnetic interference of forceful electric power, and therefore, not only cost is low, and reliability is high;

4, lengthen the life: traditional CJX2 A.C. contactor, a CJX2 A.C. contactor transformed with " economize on electricity muting unit " of the present invention, after the same place that room temperature is 34 ° of C runs 10 hours simultaneously, the temperature on the former surface has surpassed 60 ° 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 shorter, otherwise useful life just can extend.Therefore, the present invention has " lengthening the life " function extending product useful life;

5, quick: the present invention is provided with " threshold voltage ", AC voltage be greater than " threshold voltage ", " adhesive power " enough large time, A.C. contactor just does adhesive action.Therefore, adhesive action of the present invention is strong and powerful, clear, sucting speed is fast.The advantage of quick pick-up of the present invention, can reduce the electric arc of contact, prevent contact from burning inefficacy, has important effect to protection contact, prolongation contactor life-span.

6, economize on electricity: temperature rise is low, be the visualize of economize on electricity, measured result also shows, the present invention has higher electric energy.

In order to survey electric energy of the present invention, just making model machine (only need two electronic components, model machine is easy to do), having measured the index of following two kinds of A.C. contactors with " EPM8200 multifunctional electrical parameter measuring instrument " respectively:

(1) the conventional AC contactor CJX2(of the present invention's it " economize on electricity muting unit ", is not added hereinafter referred to as traditional part);

(2), by method of the present invention, novel " not only economize on electricity but also the quiet A.C. contactor without making an uproar " (hereinafter referred to as part of the present invention) that described conventional AC contactor CJX2 adds that " economize on electricity muting unit " transform afterwards.

Result is as following table 1:

Table 1

Above measured result shows: " active power power saving rate " of the present invention reaches 65%, and " apparent power power saving rate " reaches 86%.

After application the present invention, every CJX2 type A.C. contactor can power saving 8.2va.1,000,000,000 A.C. contactors in the whole nation (all by the calculating of CJX2 type) then can power saving 8,200,000 Kva, and the total installation of generating capacity in hydraulic engineering the biggest in the world-power station, the Yangtze River Gorges is 1,820 ten thousand Kva.If 1,000,000,000 A.C. contactors in the whole nation all apply this patent, be then equivalent to build power station, nearly half Yangtze River Gorges, show the large economic and social profit of tool that the present invention is contained!

7, noise elimination.After nineteen twenty-four, the first in the world A.C. contactor was born, AC noise and A.C. contactor with regard to " as shade with ", the stage that the AC noise of industry personnel to conventional AC contactor reaches " customary, face the fearful with no fears ".The present invention can accomplish quiet noiseless, even if in the dead of night, also can't hear noise, makes onlooker in the industry express one's surprise, wonder, etc in fact.

Accompanying drawing explanation

Fig. 1 is the fundamental diagram of conventional AC contactor;

Fig. 2 is the functional-block diagram of embodiment 1;

Fig. 3 is the circuit theory diagrams of embodiment 1;

Fig. 4 is the working state figure of embodiment 1 in t2 ~ t3 time domain, in figure:

The charging current that i23 provides in t2 ~ t3 time domain for AC voltage, ic23 are the charging current of electric capacity C in t2 ~ t3 time domain, iL23 is the charging current of magnet exciting coil L in t2 ~ t3 time domain;

Fig. 5 is the working state figure of embodiment 1 in t3 ~ t4 time domain, in figure:

Ic34 is the discharging current of electric capacity C in t3 ~ t4 time domain, iL34 is the discharging current of magnet exciting coil L in t3 ~ t4 time domain;

Fig. 6 is the working state figure of embodiment 1 in t4 ~ t5 time domain, in figure:

The charging current that i45 provides in t4 ~ t5 time domain for AC voltage, ic45a are the charging current of electric capacity C in t4 ~ t5 time domain, ic45b is the discharging current of electric capacity C in t4 ~ t5 time domain, iL45 is the freewheel current of magnet exciting coil L in t4 ~ t5 time domain;

Fig. 7 is the working state figure of embodiment 1 in t5 ~ t6 time domain, in figure:

The charging current that i56 provides in t5 ~ t6 time domain for AC voltage, ic5 6 are the charging current of electric capacity C in t5 ~ t6 time domain, iL5 6 is the charging current of magnet exciting coil L in t5 ~ t6 time domain;

Fig. 8 is the working state figure of embodiment 1 in t6 ~ t7 time domain, in figure:

Ic67 is the discharging current of electric capacity C in t6 ~ t7 time domain, iL67 is the discharging current of magnet exciting coil L in t6 ~ t7 time domain;

Fig. 9 is the working state figure of embodiment 1 in t7 ~ t8 time domain, in figure:

The charging current that i78 provides in t7 ~ t8 time domain for AC voltage, ic78a are the charging current of electric capacity C in t7 ~ t8 time domain, ic78b is the discharging current of electric capacity C in t7 ~ t8 time domain, iL78 is the freewheel current of magnet exciting coil L in t7 ~ t8 time domain;

Figure 10 is the working state figure of embodiment 1 in t8 ~ t9 time domain, in figure:

The charging current that i89 provides in t8 ~ t9 time domain for AC voltage, ic89 are the charging current of electric capacity C in t8 ~ t9 time domain, iL89 is the charging current of magnet exciting coil L in t5 ~ t6 time domain;

Figure 11 is the functional-block diagram of embodiment 2:

Figure 12 is the circuit theory diagrams of embodiment 2;

Figure 13 is magnet exciting coil L, the current waveform figure of storage capacitor C and AC voltage oscillogram, in figure:

When IL4 is t=t4, the freewheel current of magnet exciting coil L; When Ih is t=th, the charging current of magnet exciting coil L; When IL6 is t=t6, the charging current of magnet exciting coil L; When IL7 is t=t7, the freewheel current of magnet exciting coil L; When IL9 is t=t9, the charging current of magnet exciting coil L;

IC3, IC4, IC6, IC7 are respectively the discharging current of storage capacitor C when t=t3, t=t4, t=t6, t=t7;

U1, u2, uh, u4, u6, u7, u9 are respectively the instantaneous value of AC voltage when t=t1, t=t2, t=th, t=t4, t=t6, t=t7, t=t9.

Embodiment

Below in conjunction with accompanying drawing, embodiments of the present invention are described.

Fig. 2 is the functional-block diagram of the embodiment 1 of the present invention, and Fig. 3 is the circuit theory diagrams of embodiment 1.In Fig. 2, Fig. 3: dashed rectangle 100 represents economize on electricity muting unit of the present invention, it is four port networks with two inputs and N1 and N2 end, two outputs and P1 and P2 end; In described economize on electricity muting unit 100 101 be that threshold control circuit, 102 is accumulator, L is magnet exciting coil in conventional AC contactor, A1, A2 are it two connectivity ports.

Composition graphs 2; A kind ofly not only to economize on electricity but also the quiet A.C. contactor without making an uproar, comprise economize on electricity muting unit 100 and conventional AC contactor two part be made up of break contact DD, make contact DH, dynamic iron core M, static iron core G, back-moving spring F, magnet exciting coil L, it is characterized in that: described economize on electricity muting unit 100 has N1, N2, P1, P2 tetra-ports, is four port networks; Port N1, N2 are two input port, and P1, P2 are two output port; Its structure and connected mode are: described economize on electricity muting unit 100 is held by N1, threshold control circuit 101, P1 hold, accumulator 102, P2 hold, N2 holds and is composed in series successively; Its input port N1, N2 hold with S1, S2 of AC voltage respectively and are connected, and output port P1, P2 hold with A1, A2 of magnet exciting coil L respectively and be connected.

Described economize on electricity muting unit 100 is combined by described mode with conventional AC contactor, can form novel " not only economize on electricity but also the quiet A.C. contactor without making an uproar ".

Composition graphs 2, Fig. 3 again: described threshold control circuit 101 is made up of piezo-resistance VDR1, accumulator 102 is made up of electric capacity C.

The circuit structure of the present embodiment 1 for: be in series successively economize on electricity muting unit 100, N1 namely described in composition, N2 of N1 end, piezo-resistance VDR1, P1 end, electric capacity C, P2 end, N2 end be two input port P1, P2 is two output port.

The course of work of the present embodiment 1 is set forth below in conjunction with accompanying drawing:

Composition graphs 2, Fig. 3, Figure 13: be from the mathematic(al) representation of the AC voltage of S1, S2 end input:

u=Umsin（2πft＋φ）

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

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

u=Umsin2πft

Its waveform as shown in figure 13.In figure: t represents the time.

During t=t1, AC Voltage On state, now, before AC Voltage On state, electric capacity C and magnet exciting coil L electric discharge terminates all, therefore the voltage at electric capacity C two ends (output voltage of the muting unit 100 that namely economizes on electricity) UC=0; In this t=t1 moment, the instantaneous value of AC voltage:

u1＝Umsin2πft1＜UT

In above formula, UT is the puncture voltage (be threshold voltage hereinafter referred to as this puncture voltage UT) of piezo-resistance VDR1.

Because u1=Umsin2 π ft1 < UT event piezo-resistance VDR1 is equivalent to open circuit, the output voltage UC=0 of economize on electricity muting unit 100, A.C. contactor not adhesive.

Composition graphs 1, professional and technical personnel should be clear: if be directly applied on the magnet exciting coil L of conventional AC contactor by the instantaneous value u1=Umsin2 π ft1 of the AC voltage in t=t1 moment, then 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 is only slightly larger than the elastic force of back-moving spring F, and the inadequate and slow ground adhesive of A.C. contactor, its contact subjects to scaling loss because the sparking time is longer.

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

When composition graphs 3, Figure 13: t=t2, the instantaneous value of AC voltage:

u2＝Umsin2πft2＞UT

Piezo-resistance VDR1 punctures conducting, is equivalent to short circuit.Composition graphs 3, Fig. 4, Figure 13 again, because piezo-resistance VDR1 punctures conducting, the charging current i23 that AC voltage just provides, electric capacity C, magnet exciting coil L just obtain the charging current of ic23, iL23 respectively; During to t=th, the voltage at economize on electricity muting unit 100 output voltage and electric capacity C or magnet exciting coil L two ends is enough high, is:

Uch＝uh＝Umsin2πfth

In above formula, Uch represents the output voltage of economize on electricity muting unit 100 when t=th.

During t=th, AC voltage has ordered about magnet exciting coil L and has obtained enough strong charging current and exciting current Ih, enough greatly, under the effect of enough large adhesive power that produces of enough strong Uch, Ih, A.C. contactor just powerful adhesive enter sticking state.

Analyze so far, can reach a conclusion: economize on electricity muting unit 100 has to the random AC voltage connected the function automatically differentiated: instantaneous value u=Umsin2 π ft < UT(and threshold voltage when AC voltage) time, the voltage U C=0 that described economize on electricity muting unit 100 exports, A.C. contactor not adhesive; When the instantaneous value u=Umsin2 π ft > UT of AC voltage, piezo-resistance VDR1 punctures conducting, AC voltage provides adhesive power are enough large, A.C. contactor just powerful adhesive.

In brief: economize on electricity muting unit 100 has to the random AC voltage connected the function automatically differentiated: when the instantaneous value of AC voltage is less than threshold voltage UT, A.C. contactor not adhesive; Otherwise, when the instantaneous value of AC voltage be greater than threshold voltage UT, its adhesive power provided enough large time, A.C. contactor just powerful adhesive.

Therefore, as long as select the sufficiently high piezo-resistance VDR1 of UT, can guarantee that A.C. contactor adhesive is strong and powerful.

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

Composition graphs 1, after A.C. contactor adhesive when t=th, dynamic iron core M, the mutual adhesive of static iron core G, the inductance value comparatively adhesive precontract of magnet exciting coil L is anxious increases 200 times.

The inductance value of composition graphs 4, Figure 13 again, magnet exciting coil L when t=th anxious increase 200 times after, the charging current iL23 on it also should correspondingly suddenly subtract, but can not suddenly change due to the electric current on inductance, therefore in th ~ t3 time domain, the charging current iL23 ≈ Ih on it.

Again when composition graphs 4, Figure 13, t=t3, the voltage at electric capacity C two ends is charged to UC3, and the voltage at piezo-resistance VDR1 two ends is that Umsin2 π ft3-UC3 < UT makes that it turns off, it is equivalent to open circuit.

Composition graphs 5 again, in the time domain of t3 ~ t4:

Due to piezo-resistance VDR1 turn off, it is equivalent to open circuit, therefore, be equivalent to economize on electricity muting unit 100 and disconnect with AC voltage;

Before AC voltage disconnects, electric capacity C and magnet exciting coil L all contains electric energy;

Energy is released in electric capacity C electric discharge, and its discharging current is ic34; Because the electric current on magnet exciting coil L can not suddenly change, therefore it take electric current as iL34 " afterflow "; The discharging current ic34 of electric capacity C, both freewheel current iL34 numerical value of magnet exciting coil L are equal, and direction is complementary, and A.C. contactor continues to keep sticking state with electric capacity C and magnet exciting coil L complementation electric discharge.

In other words: in the time domain that piezo-resistance VDR1 turns off, A.C. contactor relies on the electric energy that stores of electric capacity C and magnet exciting coil L and maintains sticking state.

When composition graphs 6, Figure 13, t=t4:

AC voltage is in S2 and holds as high level, S1 end are low level negative half period, and namely S2 holds is anode, S1 end is negative terminal, and its instantaneous value is u4=Umsin2 π ft4;

When being discharged to t=t4, electric capacity C remain P1 end for just, P2 end for negative voltage U c4(herein, claim voltage U c4 to be " residual voltage ");

Now, the voltage at piezo-resistance VDR1 two ends is: Uc4+u4=Uc4+Umsin2 π ft4 > UT, and it punctures conducting, is equivalent to short circuit; AC voltage charges to electric capacity C again, and charging current is ic45a;

Now, the freewheel current of magnet exciting coil L is iL45, and because the electric current on inductance can not suddenly change, therefore it is still by the afterflow of former direction.According to the polarity of now AC voltage, AC voltage can not provide this afterflow iL45, and the residual voltage Uc4 now on electric capacity C just in time can provide described afterflow iL45, therefore the residual voltage Uc4 on electric capacity C is not by AC tension discharge (if so, power factor will decline) but with discharging current ic45b=iL45 to magnet exciting coil L complementation electric discharge, make magnetic coil L keep " afterflow ".Power factor of the present invention that Here it is is far above the major reason of the power factor of conventional AC contactor.

Again in conjunction with Figure 13, Fig. 7, during t=t5:

" afterflow " electric current on magnet exciting coil L reduce to zero, AC voltage with electric current be i56 to electric capacity C, magnet exciting coil L charging energy-storing, the charging stream on electric capacity C is ic56, and the charging stream on magnet exciting coil L is iL56.During to t=t6, the voltage at piezo-resistance VDR1 two ends is:

u6－Uc6＝Umsin2πft6－Uc6＜UT

In above formula, u6 is the instantaneous value of AC voltage when t=t6, the Uc6 voltage that to be electric capacity C be when t=t6.Piezo-resistance VDR1 ends, be equivalent to open circuit, be equivalent to AC voltage and electric capacity C, magnet exciting coil L disconnect, it is equivalent that the present invention enters again Fig. 8: electric capacity C maintains the state of A.C. contactor sticking with current i L67 complementation electric discharge with current i c67, magnet exciting coil L.

When t=t6, because A.C. contactor is in the state of adhesive, the inductance value of magnet exciting coil L is relatively large, therefore the numerical value of its charging current IL6 when t=t6 is much smaller than the numerical value of described Ih (in Figure 13, for ease of signal of drawing, the numerical value of Ih, IL6 in figure is disproportionate mutually).

As previously mentioned, in the time domain of t6 ~ t7, piezo-resistance VDR1 ends, be equivalent to open circuit, be equivalent to AC voltage and electric capacity C, magnet exciting coil L disconnect, the operating state that the present invention keeps Fig. 8 equivalent: electric capacity C discharges with current i L67 complementation with current i c67, magnet exciting coil L and maintains the state of A.C. contactor sticking.

Operating state in t4 ~ t5 time domain that operating state in t7 ~ t8 time domain that Fig. 9 is equivalent is equivalent to Fig. 6 is similar, no longer repeats here to set forth.

Operating state in t5 ~ t6 time domain that operating state in t8 ~ t9 time domain that Figure 10 is equivalent is equivalent to Fig. 7 is similar, also no longer repeats here to set forth.

The repetition gone round and begun again foregoing, can maintain the economize on electricity of A.C. contactor and the quiet sticking state without making an uproar.

It will be apparent to those skilled in the art: the inductance value of the threshold voltage of piezo-resistance VDR1, the capacitance of electric capacity C, magnet exciting coil L is important three electrical quantitys of the present invention, the combination that this three electrical quantitys are different, produces different operating states by making the present invention.

Figure 11 is the functional-block diagram of embodiment 2, and Figure 12 is the circuit theory diagrams of embodiment 2.

In conjunction with Figure 11; A kind ofly not only to economize on electricity but also the quiet A.C. contactor without making an uproar, comprise economize on electricity muting unit 100 and conventional AC contactor two part be made up of break contact DD, make contact DH, dynamic iron core M, static iron core G, back-moving spring F, magnet exciting coil L, it is characterized in that: described economize on electricity muting unit 100 has N1, N2, P1, P2 tetra-ports, is four port networks; Port N1, N2 are two input port, and P1, P2 are two output port; Its structure and connected mode are: described economize on electricity muting unit 100 is held by N1, P1 holds, accumulator 102, P2 hold, threshold control circuit 101, N2 hold and be composed in series successively; Its input port N1, N2 hold with S1, S2 of AC voltage respectively and are connected, and output port P1, P2 hold with A1, A2 of magnet exciting coil L respectively and be connected.

Again in conjunction with Figure 11, Figure 12: described threshold control circuit 101 is made up of piezo-resistance VDR1, accumulator 102 is made up of electric capacity C.

The economize on electricity muting unit 100, N1 that the circuit structure of the present embodiment 2 is: N1 end, P1 end, electric capacity C, P2 end, piezo-resistance VDR1, N2 end are in series successively namely described in composition, N2 are two input port P1, P2 is two output port.

Compared with embodiment 1, although the circuit structure of the present embodiment 2 has done variation, its operation principle and the course of work are still identical with embodiment 1.

In sum, feature of the present invention can be summed up:

1, electric capacity C and magnet exciting coil L is in parallel, and after their parallel connections, one end connects output P1 and holds, and the other end connects output P2 and holds.

2, threshold voltage controls conducting or the cut-off of piezo-resistance VDR1: when the voltage at piezo-resistance VDR1 two ends is greater than its threshold voltage, its conducting; When the voltage at piezo-resistance VDR1 two ends is less than its threshold voltage, its cut-off.

3, during piezo-resistance VDR1 conducting, described electric capacity C charging energy-storing; Otherwise during piezo-resistance VDR1 cut-off, described electric capacity C and described magnet exciting coil L complementation is discharged.

4, the muting unit 100 that economizes on electricity has to the random AC voltage connected the function automatically differentiated: when the instantaneous value of AC voltage is less than threshold voltage UT, A.C. contactor not adhesive; Otherwise, when the instantaneous value of AC voltage be greater than threshold voltage UT, its adhesive power provided enough large time, A.C. contactor just powerful adhesive.

Above describe technical scheme of the present invention, all do not depart from the technical substitution of the essence of technical scheme of the present invention, all should in the scope of claim of the present invention.

Claims

1. an A.C. contactor, comprises conventional AC contactor and economize on electricity muting unit two parts; It is characterized in that:

Described conventional AC contactor is made up of break contact (DD), make contact (DH), dynamic iron core (M), static iron core (G), back-moving spring (F), magnet exciting coil (L);

Described economize on electricity muting unit is four port networks, comprises 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) and the second input port (N2) are connected with the first end (S1) of AC voltage and the second end (S2) respectively, and the first output port (P1) and the second output port (P2) are connected with the first end (A1) of described magnet exciting coil (L) and the second end (A2) respectively; Further, described economize on electricity muting unit only comprises two electronic components, is respectively: piezo-resistance (VDR1) and electric capacity (C); Described piezo-resistance (VDR1) forms threshold control circuit, described electric capacity (C) forms accumulator, wherein, first input end mouth (N1), piezo-resistance (VDR1), the first output port (P1), electric capacity (C), the second output port (P2), the second input port (N2) are connected successively; Wherein, electric capacity (C) and magnet exciting coil (L) are in parallel, make one end of electric capacity (C) connect the first output port (P1), the other end of electric capacity (C) connects the second output port (P2);

The threshold voltage of piezo-resistance (VDR1) controls conducting or the cut-off of piezo-resistance (VDR1): when the voltage at piezo-resistance (VDR1) two ends is greater than its threshold voltage, its conducting; Otherwise, when the voltage at piezo-resistance (VDR1) two ends is less than its threshold voltage, its cut-off; And when piezo-resistance (VDR1) conducting, electric capacity (C) charging energy-storing; Otherwise when piezo-resistance (VDR1) is ended, described electric capacity (C) discharges with described magnet exciting coil (L) complementation;

Thus, when the instantaneous value of AC voltage is less than the threshold voltage of piezo-resistance (VDR1), the not adhesive of described A.C. contactor; When the instantaneous value of AC voltage is greater than the threshold voltage of piezo-resistance (VDR1), A.C. contactor adhesive.