CN1469408A - Controller for electromagnetic system of universal contactor - Google Patents
Controller for electromagnetic system of universal contactor Download PDFInfo
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- CN1469408A CN1469408A CNA021368813A CN02136881A CN1469408A CN 1469408 A CN1469408 A CN 1469408A CN A021368813 A CNA021368813 A CN A021368813A CN 02136881 A CN02136881 A CN 02136881A CN 1469408 A CN1469408 A CN 1469408A
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- effect transistor
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Abstract
The present invention discloses one kind of controller for electromagnetic system of universal contactor. The present invention features the regulation of exciting winding voltage via controlling the duty ratio of power supply in switching on, maintaining the core closed state with the aftercurrent loop comprising the exciting winding and one FET, the shut-off of the timer controlled after the operation of the core and the end of vibration for smooth switching on, and turning off the FET with a delayer for fast attenuation of the aftercurrent in switching off. The contactor with the said controller has the capacity of switching on and off short-circuit current similar to that of a breaker, and may be cooperated with weak electrical control circuit to realize remote automatic control.
Description
Technical field
The present invention relates to a kind of controller of ac contactor electromagnetic system, adopt the A.C. contactor of the controller of electromagnetic system of the present invention, can turn-off continuous current circuit fast after the outage, make disengaging movement speed unshakable in one's determination far above traditional contactor, thereby the ability with disjunction short circuit current, thereby the controller of a kind of electromagnetic system of universal contactor of more specifically saying so.
Background technology
Adopt contactor positive and negative variation of magnetic flux unshakable in one's determination in the connection process of alternating electromagnet, it is 0 that magnetic flux is crossed 0 o'clock suction, so switching force fluctuates, during disjunction because the short-circuited conducting sleeve afterflow, the degaussing time unshakable in one's determination is long, cause disjunction long time of delay, and the disjunction movement velocity is low.
Adopt the contactor of DC electromagnet, alternating current 220V voltage is given excitatory coil of wire power supply again behind bridge rectifier after the series capacitance step-down, so become the little electric current of low-voltage after the step-down.When energized, the travel switch K in parallel with electric capacity makes the capacitor C short circuit, so the 220V high voltage is directly excitatory for excitatory coil of wire high-voltage large current behind bridge rectifier.The contactor disjunction of this circuit is to be realized by the control power supply that turn-offs 220V, after 220V is turned off, the excitatory coil of wire constitutes the continuous current circuit of conducting through bridge rectifier, the whole excitatory coil of wire becomes a big short-circuited conducting sleeve, it can make afterflow keep the 100ms-200ms time, in the moving disengaging movement process unshakable in one's determination, magnetic flux descends and produces induced potential u for negative on just down in the excitatory coil of wire, and this pressure energy induced electricity strengthens afterflow and makes separating rate decline unshakable in one's determination.Therefore the contact separating rate can only reach below the 0.2m/s; so time of afterflow is very long; disjunction length time of delay and disjunction movement velocity are low to cause the contactor arcing time long; breaking capacity is low; thereby the making capacity of traditional A.C. contactor to compare with circuit breaker with breaking capacity be very low; therefore the ability that does not have connection and disjunction short circuit current does not just possess short-circuit protection function yet.And because travel switch and interlock unshakable in one's determination, therefore unshakable in one's determination just having opened at closed front travel switch inserted energizing loop with decompression capacitor, therefore this moment, exciting curent became little electric current by big current conversion, suction can diminish suddenly when closed, cause contact and iron coring vibration big, make making capacity low.
Further analyze, why circuit breaker has the ability of connection and disjunction short circuit current, be because the switching force or the separating brake power of circuit breaker realize by energy-stored spring, active force is all identical when therefore each connection or disjunction, and active force can not suddenly change and fluctuate when connecting, just can not occur spring or vibration when contact is connected so yet, can not occur time of delay during disjunction simultaneously as the contactor as the contactor.
Summary of the invention
What the present invention will solve is that existing contactor time of afterflow when disjunction is long, and breaking capacity is low, does not have short-circuit protection function, and contact and iron coring vibration are big when closing a floodgate, and adhesive is unreliable, the problem that making capacity is low.
The technical scheme that addresses the above problem employing is: the controller of electromagnetic system of universal contactor, comprise rectification circuit, after connecting with field effect transistor, magnetizing coil constitutes the total head energizing loop with rectifier bridge, magnetizing coil and another field effect transistor form continuous current circuit, during combined floodgate, field effect transistor in the described total head energizing loop is turn-offed by electronic timer control in closed stable back unshakable in one's determination and is entered the gap conducting state, and it is excitatory that described total head energizing loop and continuous current circuit alternate conduction make magnetizing coil L1 keep low-voltage; During disjunction, described field effect transistor is turn-offed by the electronic delay device, and the time of delay of described electronic delay device is less than the afterflow damping time constant.
The present invention adopts a kind of electronic circuit to control the exciting curent of DC electromagnet, turn-off exciting curent by field effect transistor during disjunction, make suction unshakable in one's determination be tending towards 0 fast by stationary value, time of delay even also shorter than circuit breaker, when the large opening sum of two fractures is equal to or greater than circuit breaker fracture distance, contactor has just had the ability of the disjunction short circuit current as the circuit breaker so, and has shortened the arcing time, and electric life is long.Because the double break point, so breaking speed is also fast than circuit breaker.In addition, the present invention utilizes the duty of control power supply switching recently to adjust the magnetizing coil both end voltage, and the continuous current circuit that is formed by magnetizing coil and another field effect transistor is kept closed iron core again; After the timing turn-off time of timer circuit is controlled at adhesive unshakable in one's determination and vibrates end, also promptly after unshakable in one's determination and contact adhesive are stablized, just excitatory big current conversion is become to keep little electric current, the DC electromagnet magnetic flux is evenly to rise in this process, do not have 0 point again, so switching force is stable just as the energy-stored spring power in the circuit breaker.
As a further improvement on the present invention, described timer circuit comprises the triode Q2 of field effect transistor Q3 conducting or shutoff in the described total head energizing loop of control, and the base voltage of described triode Q3 is provided by the control circuit of a gap zero crossing.The base voltage control circuit of described triode Q3 comprises resistance R 3, R8, capacitor C 3 and voltage-stabiliser tube D11, it is in parallel after resistance R 8 is connected with voltage-stabiliser tube D11 with capacitor C 3, then connect with resistance R 3 again and insert rectifier bridge, described resistance R 8 is connected across on the base stage and collector electrode of triode Q2.Series connection prevents that described capacitor C 3 from providing the diode D9 of base current to triode Q2 on described capacitor C 3 branch roads.
Further improve described capacitor C 3 two ends bleeder resistance R6 in parallel again as of the present invention.Behind power cut-off, make capacitor C 3 repid discharges, drop to 0 until capacitor C 3 voltages, guarantee the accuracy of closing a floodgate and regularly turn-offing field effect transistor Q3 next time.
Further improve as of the present invention, the electronic delay device of controlling described field effect transistor Q1, Q3 time delayed turn-off is made of the circuit that resistance and electric capacity are in parallel again, and two circuit time of delay sum less than afterflow damping time constant T.Described magnetizing coil L1 two ends parallel connection prevents the capacitor C 4 of the piezo-resistance VR1 and the absorbing high-frequency voltage of too high voltages.Between the grid of described field effect transistor Q1, Q3 and the source electrode respectively cross-over connection prevent voltage-stabiliser tube D7, the D12 that gate bias are too high.
Further improve again as of the present invention, also be provided with weak control circuit, described weak control circuit comprises light current combined floodgate control loop and light current separating brake control loop, controls field effect transistor Q3 in the described total head energizing loop and/or the field effect transistor Q1 break-make in the described continuous current circuit by electronic trip unit.Described light current combined floodgate control loop is made up of resistance R 9, capacitor C 5, photoelectric coupling circuit Q6 and K switch 1, described light current separating brake control loop is made up of resistance R 10, photoelectric coupling circuit Q4, Q5 and K switch 2, and described K switch 1 and K2 are the toggle switches of same single-pole double throw.The present invention has communication, measurement, calculating simultaneously, shows memory like this, functions such as storage, and can realize remote measurement, functions such as remote regulating, distant news, remote control.
The above-mentioned feature of controller makes universal contactor that two kinds of different control modes be arranged: first kind of control mode is to connect and the electric current of disjunction controller makes connection of universal contactor major loop and disjunction, and this control mode is identical with the control mode of traditional contactor.The power supply that second kind of control mode is controller always is in "on" position, make the controlled respectively connection and the disjunction that just can control the universal contactor major loop equally of field effect transistor of solid switch in the controller and series excitation coil with combined floodgate knob and separating brake knob, this control mode can replace combined floodgate knob and separating brake knob by the weakness signal, therefore universal contactor can be directly and computer networking, directly controlled by computer.
Description of drawings
Fig. 1 is the schematic diagram of existing ac contactor electromagnetic system controller.
Fig. 2 is the circuit block diagram of the controller of electromagnetic system of universal contactor of the present invention.
Fig. 3 is the circuit diagram of the controller of electromagnetic system of universal contactor of the present invention.
Embodiment
Figure 1 shows that the schematic diagram of existing ac contactor electromagnetic system controller, alternating current 220V voltage is powered to magnetizing coil behind bridge rectifier after the series capacitance step-down again, travel switch K is in parallel with electric capacity, when closing a floodgate and interlock unshakable in one's determination make the capacitor C short circuit, reach the excitatory low voltage sustain of high pressure.The shortcoming front of the controller of this structure was mentioned, and was not repeated.
With reference to Fig. 2,3, electromagnetic system of universal contactor controller of the present invention, ac control power supply is at first powered to controller behind the bridge rectifier that D1, D2, D3, D4 form, direct voltage is added on the magnetizing coil L1 through diode D5, field effect transistor Q3 total head, the afterflow within a certain period of time of total head energizing loop, iron core is kept closed can keeps more than 100 milliseconds, magnetizing coil L1 forms another continuous current circuit through diode D10, field effect transistor Q1.The total head rectification forms than the galvanic current potential source through capacitor C 2 filtering, diode D6 prevents that capacitor C 2 from discharging through magnetizing coil L1 loop, direct voltage on the capacitor C 2 provides grid voltage for field effect transistor Q3 through voltage-stabiliser tube D8, resistance R 4, resistance R 7 is a field effect transistor Q3 gate charge discharge loop resistance, and voltage-stabiliser tube D12 prevents that field effect transistor Q3 gate bias from surpassing permissible value.Triode Q2 is the control valve of field effect Q3 conducting or shutoff, when the control power supply rigidly connect logical after, give capacitor C 3 chargings through resistance R 3, diode D9, capacitor C 3 voltages rise gradually, when less than voltage-stabiliser tube D11 voltage stabilizing value, triode Q2 is in off state, field effect transistor Q3 gate bias are higher than the unlatching value, field effect transistor Q3 conducting total head is added on the magnetizing coil L1, after the closure unshakable in one's determination, capacitor C 3 voltages rise greater than after the voltage stabilizing D11 voltage stabilizing value, and voltage stabilizing D11 conducting makes triode Q2 conducting, therefore field effect transistor Q3 gate bias reduce to 0, and field effect transistor Q3 is turn-offed.But form after providing base current by resistance R 3 step-downs to Q2, ripple electric capacity is not considered in resistance R 3 upper ends, is moment of 0 so all there is voltage in every half-wave, and this moment, triode Q2 did not end because of having base current, and field effect transistor Q3 is also just in this moment conducting so.Therefore a low voltage pulse shaping exciting curent will appear in every half-wave, field effect transistor Q3 closes and has no progeny, the continuous current circuit that exciting curent is formed by magnetizing coil L1, diode D10, field effect transistor Q1 and conducting, diode D9 prevents that capacitor C 3 from provide base current for triode Q2.Resistance R 6 is bleeder resistances of capacitor C 3, behind power cut-off, makes capacitor C 3 repid discharges, drops to 0 until capacitor C 3 voltages, guarantees the accuracy of closing a floodgate and regularly turn-offing field effect transistor Q3 next time.The grid voltage of field effect transistor Q1 provides for capacitor C 1 charging by capacitor C 2 through resistance R 1, and resistance R 2 is bleeder resistances of capacitor C 1, and D7 prevents that field effect transistor Q1 gate bias from exceeding the voltage-stabiliser tube of permissible value.Photoelectric coupling circuit Q7 and Q8 form the electronic trip unit interface, photoelectric coupling circuit Q4, Q5, resistance R 10, K switch 2 are formed the disjunction control loop of light current control mode, and photoelectric coupling circuit Q6, capacitor C 5, resistance R 9 and K switch 1 are formed the connection control loop of light current control mode.D5 prevents that capacitor C 2 is by the diode of resistance R 1 to the discharge of triode Q2 base stage.
During disjunction, after turn-offing the control power supply, capacitor C 2 both end voltage are by resistance R 5 discharges, drop to D8 voltage stabilizing value when following, field effect transistor Q3 turn-offs, capacitor C 1 through resistance R 2 discharge voltages drop to field effect transistor Q1 cut-in voltage when following field effect transistor Q1 turn-off, field effect transistor Q1 closes and has no progeny, and movingly unshakable in one's determinationly just does disengaging movement breaking speed just can be very big so; If moving iron core had begun to have done disengaging movement before field effect transistor Q1 turn-offed, breaking speed will be very low so.As long as when guaranteeing R5C2+R2C1＜T, field effect transistor Q1 will will turn-off before moving iron core is done disengaging movement, wherein: the time constant T=L1/R that afterflow decays among the magnetizing coil L1, L1 is the electromagnet coil inductance, R is internal resistance.For preventing that too high impulse overvoltage from appearring in magnetizing coil, answers the capacitor C 4 of piezo-resistance Rv in parallel and absorbing high-frequency voltage.
Claims (10)
1, the controller of electromagnetic system of universal contactor, comprise rectification circuit, it is characterized in that: constitute the total head energizing loop with rectifier bridge after magnetizing coil (L1) is connected with field effect transistor (Q3), magnetizing coil (L1) forms continuous current circuit with another field effect transistor (Q1), during combined floodgate, field effect transistor (Q3) in the described total head energizing loop is turn-offed by electronic timer control in closed stable back unshakable in one's determination and is entered the gap conducting state, and it is excitatory that described total head energizing loop and continuous current circuit alternate conduction make magnetizing coil (L1) keep low-voltage; During disjunction, described field effect transistor (Q1, Q3) is turn-offed by the electronic delay device, and the time of delay of described electronic delay device is less than afterflow damping time constant T.
2, the controller of electromagnetic system of universal contactor as claimed in claim 1, it is characterized in that described timer circuit comprises the triode (Q2) of field effect transistor (Q3) conducting or shutoff in the described total head energizing loop of control, the base voltage of described triode Q3 is provided by the control circuit of a gap zero crossing.
3, the controller of electromagnetic system of universal contactor as claimed in claim 2, the base voltage control circuit that it is characterized in that described triode (Q3) comprises resistance (R3, R8), electric capacity (C3) and voltage-stabiliser tube (D11), it is in parallel after resistance (R8) is connected with voltage-stabiliser tube (D11) with electric capacity (C3), then connect with resistance (R3) again and insert rectifier bridge, described resistance (R8) is connected across on the base stage and collector electrode of triode (Q2).
4, the controller of electromagnetic system of universal contactor as claimed in claim 3 is characterized in that series connection prevents that described electric capacity (C3) from providing the diode (D9) of base current to triode (Q2) on described electric capacity (C3) branch road.
5, the controller of electromagnetic system of universal contactor as claimed in claim 4 is characterized in that described electric capacity (C3) two ends bleeder resistance (R6) in parallel.
6, the controller of electromagnetic system of universal contactor as claimed in claim 5, it is characterized in that the electronic delay device of controlling described field effect transistor (Q1, Q3) time delayed turn-off is made of the circuit that comprises resistance and electric capacity, and two circuit time of delay sum less than afterflow damping time constant T.
7, the controller of electromagnetic system of universal contactor as claimed in claim 6 is characterized in that described magnetizing coil L1 two ends parallel connection prevents the piezo-resistance (VR1) of too high voltages and the electric capacity (C4) of absorbing high-frequency voltage.
8, the controller of electromagnetic system of universal contactor as claimed in claim 7 is characterized in that between the grid of described field effect transistor (Q1, Q3) and the source electrode that cross-over connection prevents the too high voltage-stabiliser tube of gate bias (D7, D12) respectively.
9, as the controller of any one described electromagnetic system of universal contactor of claim 1～8, it is characterized in that also being provided with weak control circuit, described weak control circuit comprises light current combined floodgate control loop and light current separating brake control loop, controls field effect transistor (Q3) in the described total head energizing loop and/or field effect transistor (Q1) break-make in the described continuous current circuit by electronic trip unit.
10, the controller of electromagnetic system of universal contactor as claimed in claim 9, it is characterized in that described light current combined floodgate control loop is made up of resistance (R9), electric capacity (C5), photoelectric coupling circuit (Q6) and switch (K1), described light current separating brake control loop is made up of resistance (R10), photoelectric coupling circuit (Q4, Q5) and switch (K2), and described two switches (K1, K2) are the toggle switches of same single-pole double throw.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02266969.8U CN2596536Y (en) | 2002-09-06 | 2002-09-06 | Controller of general contactor electromagnetic system |
| CN02136881.3A CN1233009C (en) | 2002-09-06 | 2002-09-06 | Controller for electromagnetic system of universal contactor |
| AU2003261592A AU2003261592A1 (en) | 2002-09-04 | 2003-09-02 | A controller for electromagnetic systems of current contactors |
| PCT/CN2003/000737 WO2004023505A1 (en) | 2002-09-04 | 2003-09-02 | A controller for electromagnetic systems of current contactors |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02266969.8U CN2596536Y (en) | 2002-09-06 | 2002-09-06 | Controller of general contactor electromagnetic system |
| CN02136881.3A CN1233009C (en) | 2002-09-06 | 2002-09-06 | Controller for electromagnetic system of universal contactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1469408A true CN1469408A (en) | 2004-01-21 |
| CN1233009C CN1233009C (en) | 2005-12-21 |
Family
ID=50138111
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN02136881.3A Expired - Lifetime CN1233009C (en) | 2002-09-04 | 2002-09-06 | Controller for electromagnetic system of universal contactor |
| CN02266969.8U Expired - Lifetime CN2596536Y (en) | 2002-09-06 | 2002-09-06 | Controller of general contactor electromagnetic system |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN02266969.8U Expired - Lifetime CN2596536Y (en) | 2002-09-06 | 2002-09-06 | Controller of general contactor electromagnetic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN1233009C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103065890A (en) * | 2012-12-18 | 2013-04-24 | 上海电器科学研究院 | Shock resisting under-voltage release device and method |
| CN105355514A (en) * | 2015-12-14 | 2016-02-24 | 宁波市镇海华泰电器厂 | Power-saving low-heat silencing alternating-current contactor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7859811B2 (en) * | 2007-09-19 | 2010-12-28 | General Electric Company | Modular communication plug-in module for an electronic trip unit |
-
2002
- 2002-09-06 CN CN02136881.3A patent/CN1233009C/en not_active Expired - Lifetime
- 2002-09-06 CN CN02266969.8U patent/CN2596536Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103065890A (en) * | 2012-12-18 | 2013-04-24 | 上海电器科学研究院 | Shock resisting under-voltage release device and method |
| CN103065890B (en) * | 2012-12-18 | 2015-03-04 | 上海电器科学研究院 | Shock resisting under-voltage release device and method |
| CN105355514A (en) * | 2015-12-14 | 2016-02-24 | 宁波市镇海华泰电器厂 | Power-saving low-heat silencing alternating-current contactor |
| CN105355514B (en) * | 2015-12-14 | 2018-03-27 | 宁波市镇海华泰电器厂 | The A.C. contactor of economize on electricity low-heat noise elimination |
Also Published As
| Publication number | Publication date |
|---|---|
| CN2596536Y (en) | 2003-12-31 |
| CN1233009C (en) | 2005-12-21 |
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Owner name: CORRECT ZHENGTAI GROUP CO., LTD. Free format text: FORMER NAME OR ADDRESS: CORRECT ZHENGTAI GROUP CO.,LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 325603 CHINT hi tech Industrial Park, North white elephant, Wenzhou, Zhejiang Patentee after: CHINT Group Corp. Address before: 325603 CHINT hi tech Industrial Park, North white elephant, Wenzhou, Zhejiang Patentee before: Chint Group Corp. |
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Owner name: ZHEJIANG ZHENGTAI ELECTRIC APPLIANCE CO., LTD. Free format text: FORMER OWNER: CORRECT ZHENGTAI GROUP CO., LTD. Effective date: 20070817 |
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Effective date of registration: 20070817 Address after: 325603 CHINT Industrial Park, North white elephant, Zhejiang, Yueqing Patentee after: ZHEJIANG CHINT ELECTRICS Co.,Ltd. Address before: 325603 CHINT hi tech Industrial Park, North white elephant, Wenzhou, Zhejiang Patentee before: CHINT Group Corp. |
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Granted publication date: 20051221 |
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