CN102946106A - Silicon controlled rectifier combination switch - Google Patents
Silicon controlled rectifier combination switch Download PDFInfo
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- CN102946106A CN102946106A CN2012104867562A CN201210486756A CN102946106A CN 102946106 A CN102946106 A CN 102946106A CN 2012104867562 A CN2012104867562 A CN 2012104867562A CN 201210486756 A CN201210486756 A CN 201210486756A CN 102946106 A CN102946106 A CN 102946106A
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- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a silicon controlled rectifier combination switch. The silicon controlled rectifier combination switch comprises a bidirectional silicon controlled rectifier (SCR), a first electromagnetic switch K1, a second electromagnetic switch K2 and a resistor R. The bidirectional SCR is provided with a control end G, a first main terminal T1 and a second main terminal T2, wherein the first main terminal T1 and the second main terminal T2 of the bidirectional SCR are in parallel connection with two ends of a normally opened contact K1-1 of the first electromagnetic switch K1. A normally opened contact K2-1 of the second electromagnetic switch K2 is in series connection with the resistor R. Two ends of a series circuit formed by the normally opened contact K2-1 of the second electromagnetic switch K2 and the resistor R are connected to two ends of the normally opened contact K1-1 of the first electromagnetic switch K1 in parallel. The silicon controlled rectifier combination switch has the advantages of achieving zero-current silicon controlled rectifier breakover, being reliable in switching process and the like.
Description
Technical field
The present invention relates to a kind of controllable silicon compound switch, it is the device for the control capacitor switching, is the important component part of reactive compensator of electrical network, and the quality of fling-cut switch element function plays very important effect to the reliability of reactive power compensator.
Background technology
In the implementation process of electric network reconstruction, often need to increase the shunt capacitor reactive power compensator, to improving the supply power voltage quality, excavate the potentiality of power supply unit, reduce line loss and energy-conservationly all play a positive role.
Early stage reactive power compensator mostly adopts the switching modes such as A.C. contactor, controllable silicon electronic switch, A.C. contactor can produce very large shoving and overvoltage when capacitor drops into and excise, the high pressure of transient state and switching impulse current can cause capacitor insulation puncture, probe of contactor scaling loss; Although and the controllable silicon electronic switch has solved the problems such as shoving in the capacitor switching process, overvoltage, breaking arc, but it dispels the heat difficult, need add that the auxiliary heat dissipation device is many, complex structure, cost be high, it is large to take up room, dual mode compensation effect and all not ideal enough on useful life.
In recent years, the development of power electronic technology and controllable silicon technology derives a kind of new device---combination switch in reactive power compensator.Existing compound switch structure is with controllable silicon and relay and connects, as shown in Figure 5.The implementation method that generally believes at present is: during input, at the voltage zero-cross moment zero cross fired controllable silicon in parallel with relay or contactor, stable after again with relay or contactor adhesive conducting; And when cutting out, first with controlled silicon conducting, then relay or contacts of contactor are disconnected, produce electric arc when avoiding relay or contactor to disconnect, turn-off at current zero-crossing point place controllable silicon at last, thereby realize that current over-zero cuts off.
This area those skilled in the art as can be known, make controlled silicon conducting (take one-way SCR as example), need two necessary conditions: the one, between its anode A and negative electrode K, add forward voltage, the 2nd, between its control utmost point G and negative electrode K, input a forward trigger voltage (being commonly called as an individual Trig control signal).In other words, no matter be the one-way SCR conducting, or the bidirectional triode thyristor conducting, must satisfy the controllable silicon two ends has the pressure drop and the trigger electrode that satisfy conducting that two conditions of triggering signal are arranged, and could realize the purpose of conducting.The cutting-off process of existing combination switch when being relay or contactor K disjunction, thinks that this moment, controllable silicon was conducting state, so relay or contactor do not produce electric arc when the K disjunction.And the fact is, the closure state before the disjunction of relay K contact, and the two ends, contact do not form voltage, namely, do not form forward voltage between silicon controlled anode A and the negative electrode K, although triggering signal is arranged, controllable silicon can not conducting.The contact of relay K will cut off operating current when disjunction like this, can produce a large amount of electric arc in this process, particularly in combination switch to the Capacity Selection of relay, generally be to satisfy running current to be as the criterion, do not consider fully and drop into and cut off the required capacity of main circuit operating current, so, a large amount of electric arcs that relay contact produces during cut-out make the relay contact of the combination switch in the existing structure damage easily, cause the poor reliability of combination switch work, have a strong impact on the q﹠r of power supply.
Existing most of patent has only been described the course of work in combination switch excision stage, is illustrated by following patent.Such as the patent No. " ZL200620098117.9 ", name is called the utility model patent of " dynamic reactive power compensation equipment ", adopted the quick compound relay of its delay time＜5 second in the compensating circuit of this compensation arrangement, when controlled silicon conducting, its relay normally open contact is also closed, contact resistance when closed is very little, can pass through most of electric current, is passing through the silicon controlled electric current no better than zero.Like this, in conducting process, without pressure drop with without heating, and eliminated harmonic wave on the controllable silicon, thereby compensation arrangement can be moved under dynamical state reliably.This patent has specifically described in conducting process, and controllable silicon only has triggering signal, but there is no pressure drop, do not satisfy the silicon controlled turn-on condition, be not have pressure drop between silicon controlled anode A and the negative electrode K, therefore, the compensation arrangement of this kind structure can not move under dynamical state reliably.
" 201220121016.4 " such as the patent No., name is called " a kind of contactor combination switch of operating passing zero ": testing circuit detects control signal and removes during excision, the storage capacitor delay circuit still can continue to provide the power supply of necessity, logic control is wanted isolated drive circuit and is enabled controllable silicon, then make relay disconnect contactor coil, the disjunction of contactor mechanical contact also switches to controlled silicon conducting after a period of time, and the controllable silicon electric current is zero shutoff.The patent No. " 201220016674.7 ", name are called " minute plerosis combination switch ": during excision, and the conducting of controllable silicon elder generation, then the contact of relay separates, and electric current flows through controllable silicon, and after 50 milliseconds, controllable silicon turn-offs, and current cut-off is finished the excision action.
Such as the patent No. " 200810050960.3 ", name is called " intelligent marshalling combination switch ": during excision single-phase electricity container, single-chip microcomputer is according to the order that receives, the triggering and conducting order of sending first electronic AC switch, just automatic conducting when voltage zero-cross of electronic AC switch.The patent No. " 200820216223.1 ", name is called " a kind of intelligent compound switch of dynamic passive compensation " and thinks: when cutting out operation, only need provide first the controllable silicon program sends triggering signal, send again the signal that relay disconnects, postpone to remove silicon controlled trigger signal behind tens of milliseconds, utilize the controllable silicon self-characteristic when current over-zero, to cut off voluntarily.The patent No. " 201110032781.9 ", name is called " a kind of Intelligent composite integrated switch ": when controller unit 3 receives a certain will cut off mutually the instruction of compensation condenser the time, start bidirectional triode thyristor and drive circuits for triggering, the bidirectional triode thyristor conducting is incorporated on the magnetic maintained switch, and then indicator cock drives circuits for triggering output pulse negative voltage, make switch contact be converted to normally open, at last, controller unit indication bidirectional triode thyristor drives circuits for triggering Automatic-searching zero crossing and cuts out bidirectional triode thyristor, cuts off and replenishes capacitor.The patent No. " 201020652595.6 ", name is called " dynamic combination switch ": when automatic reactive compensated controller will be withdrawn from a certain circuit capacitor, send to combination switch and to withdraw from signal, Master control chip receives removes signal, namely order the thyristor conducting, make the magnetic latching relay dead electricity after time-delay is less than 1 second, after magnetic latching relay main contacts and compensation condenser disconnected, compensation condenser also worked on by thyristor.After time-delay was less than 1 second, Master control chip was output as 0, the cut-off of optocoupler trigger, and thyristor will be in capacitor at current over-zero and disconnect, and the compensation condenser no-flashy-flow is out of service.
The patent No. " 201120498683.X ", name is called " a kind of combination switch ": when switching circuit is received the sub-gate signal that governor circuit sends, there is first large electric current to make the bidirectional triode thyristor conducting, then relay disconnects, bidirectional triode thyristor is from the full load current to the zero to cut-off, in fact, before relay disconnected, bidirectional triode thyristor is conducting not.The patent No. " ZL201220121016 " and for example, name is called in a kind of utility model patent of contactor combination switch of operating passing zero, recognize the defective that present contactor class combination switch can not disjunction when current over-zero, therefore, possess at existing combination switch on the basis of no-voltage input function, control signal is monitored, when detecting control signal and remove, still guarantee the power supply of control circuit, and again connect controllable silicon in parallel, divide fully Deng contacts of contactor and to have no progeny, make again the controllable silicon zero-current switching, realized that voltage zero-cross is connected and the function of current over-zero disjunction power capacitor, the fact is: under this operating state, when contacts of contactor disconnected, controllable silicon is conducting not.So it is inevitable that contacts of contactor forms electric arc in this state, also just will inevitably affect the reliability of combination switch.
Summary of the invention
The objective of the invention is: provide a kind of at the current over-zero controlled silicon conducting, make combination switch cut out the more reliable controllable silicon compound switch of process, can improve combination switch operating efficiency and useful life, power supply quality is high, can apply to frequent switching, require response speed and the very large occasion of switching precision, overcome the deficiency of prior art.
In order to achieve the above object, the first technical scheme of the present invention is: a kind of controllable silicon compound switch, comprise bidirectional triode thyristor SCR and the first electromagnetic switch K1, described bidirectional triode thyristor SCR has control end G and the first main terminal T1 and the second main terminal T2, and the two ends of the normally opened contact K1-1 of the first main terminal T1 of bidirectional triode thyristor SCR and the second main terminal T2 and the first electromagnetic switch K1 are in parallel, and its:
A, also comprise the second electromagnetic switch K2 and resistance R;
The normally opened contact K2-1 of b, the second electromagnetic switch K2 connects with resistance R;
C, be connected in parallel on the two ends of the normally opened contact K1-1 of the first electromagnetic switch K1 by the two ends of the normally opened contact K2-1 of the second electromagnetic switch K2 and the series circuit that resistance R consists of.
In above-mentioned first technical scheme, described the first electromagnetic switch K1 and the second electromagnetic switch K2 are relay or contactor.
In above-mentioned first technical scheme, described the first electromagnetic switch K1 and the second electromagnetic switch K2 are magnetic latching relay.
In order to achieve the above object, the second technical scheme of the present invention is: a kind of controllable silicon compound switch, comprise bidirectional triode thyristor SCR and the first electromagnetic switch K1, described bidirectional triode thyristor SCR has control end G and the first main terminal T1 and the second main terminal T2, and its:
A, also comprise the second electromagnetic switch K2 and resistance R;
The normally opened contact K2-1 of b, the second electromagnetic switch K2 connects with resistance R;
C, be in parallel by the normally opened contact K2-1 of the second electromagnetic switch K2 and series circuit that resistance R consists of and the first main terminal T1 and the second main terminal T2 of bidirectional triode thyristor SCR;
The two ends of the normally opened contact K1-1 of d, the first electromagnetic switch K1 are connected in parallel on the two ends of resistance R.
In above-mentioned second technical scheme, described the first electromagnetic switch K1 and the second electromagnetic switch K2 are relay or contactor.
In above-mentioned second technical scheme, described the first electromagnetic switch K1 and the second electromagnetic switch K2 are magnetic latching relay.
In order to achieve the above object, the third technical scheme of the present invention is: a kind of controllable silicon compound switch, comprise two unidirectional controllable silicon S CR1, SCR2, and the first electromagnetic switch K1, described two unidirectional controllable silicon S CR1, SCR2 has respectively control end G1 and control end G2, and two unidirectional controllable silicon S CR1, the SCR2 reverse parallel connection also forms the first terminals A1 and the second terminals A2, two unidirectional controllable silicon S CR1, the two ends of the normally opened contact K1-1 of SCR2 reverse parallel connection and the first terminals A1 that forms and the second terminals A2 and the first electromagnetic switch K1 are in parallel, and its:
A, also comprise the second electromagnetic switch K2 and resistance R;
The normally opened contact K2-1 of b, the second electromagnetic switch K2 connects with resistance R;
C, be connected in parallel on the two ends of the normally opened contact K1-1 of the first electromagnetic switch K1 by the two ends of the normally opened contact K2-1 of the second electromagnetic switch K2 and the series circuit that resistance R consists of.
In above-mentioned the 3rd technical scheme, described the first electromagnetic switch K1 and the second electromagnetic switch K2 are relay or contactor.Certainly, the present invention preferentially selects magnetic latching relay.
In order to achieve the above object, the 4th kind of technical scheme of the present invention is: a kind of controllable silicon compound switch, comprise two unidirectional controllable silicon S CR1, SCR2, and the first electromagnetic switch K1, described two unidirectional controllable silicon S CR1, SCR2 have respectively control end G1 and control end G2, and two unidirectional controllable silicon S CR1, SCR2 reverse parallel connections also form the first terminals A1 and the second terminals A2, it is characterized in that:
A, also comprise the second electromagnetic switch K2 and resistance R;
The normally opened contact K2-1 of b, the second electromagnetic switch K2 connects with resistance R;
C, by the two ends of the normally opened contact K2-1 of the second electromagnetic switch K2 and the series circuit that resistance R consists of be in parallel by two unidirectional controllable silicon S CR1, SCR2 reverse parallel connection and the first terminals A1 and the second terminals A2 that form;
The two ends of the normally opened contact K1-1 of d, the first electromagnetic switch K1 are connected in parallel on the two ends of resistance R.
In above-mentioned the 4th technical scheme, described the first electromagnetic switch K1 and the second electromagnetic switch K2 are relay or contactor.Certainly, the present invention preferentially selects magnetic latching relay.
The good effect that the present invention has is: after adopting said structure, the present invention when dropping into by the conducting (voltage zero-cross conducting) of bidirectional triode thyristor SCR elder generation, first, second electromagnetic switch of rear closure K1, K2; When cutting out, disjunction the first electromagnetic switch K1 of elder generation, electric current forms voltage drop by the normally opened contact K2-1 of the second electromagnetic switch K2 and the series circuit of resistance R formation, be between two main terminals of bidirectional triode thyristor pressure drop to be arranged, trigger when triggering bidirectional triode thyristor SCR(zero passage), bidirectional triode thyristor SCR conducting, this moment, operating current was respectively by bidirectional triode thyristor SCR and the first electromagnetic switch K1, but the electric current of the bidirectional triode thyristor SCR that flows through is much larger than the electric current of the first electromagnetic switch K1 that flows through, with the first electromagnetic switch K1 disjunction, bidirectional triode thyristor SCR delay zero-crossing turn-offs.Whole cutting out in the process, do not bear electric current during the first electromagnetic switch K1 disjunction, only bear very little electric current during the second electromagnetic switch K2 disjunction, that is to say by the control to the first electromagnetic switch K1 and the second electromagnetic switch K2, the realization electromagnetic switch is guaranteed the conducting of controllable silicon elder generation before the disjunction main circuit current, then the electromagnetic switch contact of disjunction main circuit makes the main circuit contact in the Weak current disjunction, controls at last controllable silicon and turn-offs at current zero-crossing point.Certainly, bidirectional triode thyristor SCR also can replace to the ghyristor circuit that is made of two unidirectional controllable silicon S CR1, SCR2 reverse parallel connection, and the good effect that produces is identical with bidirectional triode thyristor.The invention enables main circuit before cutting out, can make controllable silicon really realize passing zero trigger, and under the state of controlled silicon conducting, the electromagnetic switch contact of disjunction main circuit, thereby thoroughly overcome the defective that prior art its contact when the electromagnetic switch disjunction produces a large amount of electric arcs, solved when electromagnetic switch is cut off main circuit current in the industry prior art, the electromagnetic switch contact produces a large amount of electric arcs and causes the insecure problem of combination switch work, present ubiquitous understanding mistaken ideas in the industry have been solved, greatly improved the dependable with function of combination switch work, prolonged the life-span of combination switch, for the switching of capacitor reactive compensation and the construction of intelligent grid have a positive effect.
Description of drawings
Fig. 1 is the circuit theory schematic diagram of the first implementation of the present invention;
Fig. 2 is the circuit theory schematic diagram of the second implementation of the present invention;
Fig. 3 is the circuit theory schematic diagram of the third implementation of the present invention;
Fig. 4 is the circuit theory schematic diagram of the 4th kind of implementation of the present invention;
Fig. 5 is the circuit theory schematic diagram of existing combination switch.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Embodiment 1
As shown in Figure 1, a kind of controllable silicon compound switch, comprise bidirectional triode thyristor SCR and the first electromagnetic switch K1, described bidirectional triode thyristor SCR has control end G and the first main terminal T1 and the second main terminal T2, and the two ends of the normally opened contact K1-1 of the first main terminal T1 of bidirectional triode thyristor SCR and the second main terminal T2 and the first electromagnetic switch K1 are in parallel, and also comprise the second electromagnetic switch K2 and resistance R; The normally opened contact K2-1 of the second electromagnetic switch K2 connects with resistance R; Be connected in parallel on the two ends of the normally opened contact K1-1 of the first electromagnetic switch K1 by the two ends of the normally opened contact K2-1 of the second electromagnetic switch K2 and the series circuit that resistance R consists of.
Described the first electromagnetic switch K1 of the present invention and the second electromagnetic switch K2 are relay or contactor.
Certainly, the present invention preferentially selects magnetic latching relay.
When embodiment 1 uses, below all select magnetic latching relay as example take the first electromagnetic switch K1 and the second electromagnetic switch K2.The control end G of bidirectional triode thyristor SCR is electrically connected with the triggering signal control end of controllable silicon drive circuit, the coil of the coil of the first magnetic latching relay K1 and the second magnetic latching relay K2 is electrically connected with the corresponding link of drive circuit of magnetic latching relay respectively, and the first main terminal T1 of bidirectional triode thyristor SCR and the second main terminal T2 are electrically connected with reactive power compensation circuit or the corresponding link of motor-drive circuit respectively.
The course of work of embodiment 1: by the conducting (voltage zero-cross conducting) of bidirectional triode thyristor SCR elder generation, first, second magnetic latching relay of rear closure K1, K2(are certain when dropping into, also closed the first magnetic latching relay K1 only); When cutting out, disjunction the first magnetic latching relay K1, if (closed the first magnetic latching relay K1 only when dropping into, closed the second magnetic latching relay K2 of elder generation when then cutting out, disjunction the first magnetic latching relay K1 again,) electric current passes through the normally opened contact K2-1 of the second magnetic latching relay K2 and the series circuit of resistance R formation forms voltage drop, be between the first main terminal T1 of bidirectional triode thyristor SCR and the second main terminal T2 pressure drop to be arranged, at this moment, trigger bidirectional triode thyristor SCR conducting (triggering during zero passage), the operating current overwhelming majority bidirectional triode thyristor of flowing through, disjunction the second magnetic latching relay K2 again, last bidirectional triode thyristor SCR disconnects.
Embodiment 2
As shown in Figure 2, a kind of controllable silicon compound switch comprises bidirectional triode thyristor SCR and the first electromagnetic switch K1, and described bidirectional triode thyristor SCR has control end G and the first main terminal T1 and the second main terminal T2, also comprises the second electromagnetic switch K2 and resistance R; The normally opened contact K2-1 of the second electromagnetic switch K2 connects with resistance R; Be in parallel by the normally opened contact K2-1 of the second electromagnetic switch K2 and series circuit that resistance R consists of and the first main terminal T1 and the second main terminal T2 of bidirectional triode thyristor SCR; The two ends of the normally opened contact K1-1 of the first electromagnetic switch K1 are connected in parallel on the two ends of resistance R.
Described the first electromagnetic switch K1 of the present invention and the second electromagnetic switch K2 are relay or contactor.
Certainly, the present invention preferentially selects magnetic latching relay.
When embodiment 2 uses, below all select magnetic latching relay as example take the first electromagnetic switch K1 and the second electromagnetic switch K2.The control end G of bidirectional triode thyristor SCR is electrically connected with the triggering signal control end of controllable silicon drive circuit, the coil of the coil of the first magnetic latching relay K1 and the second magnetic latching relay K2 is electrically connected with the corresponding link of drive circuit of magnetic latching relay respectively, and the first main terminal T1 of bidirectional triode thyristor SCR and the second main terminal T2 are electrically connected with reactive power compensation circuit or the corresponding link of motor-drive circuit respectively.
The course of work of embodiment 2: when dropping into by the conducting (voltage zero-cross conducting) of bidirectional triode thyristor SCR elder generation, first, second magnetic latching relay of rear closure K1, K2; When cutting out, disjunction the first magnetic latching relay K1, electric current forms voltage drop by the normally opened contact K2-1 of the second magnetic latching relay K2 and the series circuit of resistance R formation, be between the first main terminal T1 of bidirectional triode thyristor SCR and the second main terminal T2 pressure drop to be arranged, at this moment, trigger bidirectional triode thyristor SCR conducting (triggering during zero passage), the operating current overwhelming majority bidirectional triode thyristor of flowing through, disjunction the second magnetic latching relay K2 again, last bidirectional triode thyristor SCR disconnects.
If embodiments of the invention 1 and embodiment 2 will be used for the high pressure occasion, single bidirectional triode thyristor of the present invention can be replaced to the circuit that a plurality of bidirectional triode thyristor series connection consist of.
Embodiment 3
As shown in Figure 3, a kind of controllable silicon compound switch, comprise two unidirectional controllable silicon S CR1, SCR2, and the first electromagnetic switch K1, described two unidirectional controllable silicon S CR1, SCR2 have respectively control end G1 and control end G2, and two unidirectional controllable silicon S CR1, SCR2 reverse parallel connections also form the first terminals A1 and the second terminals A2, the two ends of the normally opened contact K1-1 of two unidirectional controllable silicon S CR1, SCR2 reverse parallel connection and the first terminals A1 that forms and the second terminals A2 and the first electromagnetic switch K1 are in parallel, and also comprise the second electromagnetic switch K2 and resistance R; The normally opened contact K2-1 of the second electromagnetic switch K2 connects with resistance R; Be connected in parallel on the two ends of the normally opened contact K1-1 of the first electromagnetic switch K1 by the two ends of the normally opened contact K2-1 of the second electromagnetic switch K2 and the series circuit that resistance R consists of.
Described the first electromagnetic switch K1 of the present invention and the second electromagnetic switch K2 are relay or contactor.
Certainly, the present invention preferentially selects magnetic latching relay.
When embodiment 3 uses, below all select magnetic latching relay as example take the first electromagnetic switch K1 and the second electromagnetic switch K2.Two unidirectional controllable silicon S CR1, the control end G1 that SCR2 has respectively and control end G2 are electrically connected with the corresponding triggering signal control end of controllable silicon drive circuit respectively, two unidirectional controllable silicon S CR1, the negative electrode of SCR2 and anode are electrically connected with the corresponding input of controllable silicon drive circuit respectively, the coil of the coil of the first magnetic latching relay K1 and the second magnetic latching relay K2 is electrically connected with the corresponding link of drive circuit of magnetic latching relay respectively, two unidirectional controllable silicon S CR1, SCR2 reverse parallel connection and the first terminals A1 and the second terminals A2 that form are electrically connected with reactive power compensation circuit or the corresponding link of motor-drive circuit respectively.
The course of work of embodiment 3: the ghyristor circuit elder generation conducting (voltage zero-cross conducting) that when dropping into, is consisted of by two unidirectional controllable silicon S CR1, SCR2 reverse parallel connection, first, second magnetic latching relay of rear closure K1, K2; When cutting out, disjunction the first magnetic latching relay K1, electric current forms voltage drop by the normally opened contact K2-1 of the second magnetic latching relay K2 and the series circuit of resistance R formation, between the first terminals A1 of the ghyristor circuit that is namely consisted of by two unidirectional controllable silicon S CR1, SCR2 reverse parallel connection and the second terminals A2 pressure drop is arranged, at this moment, trigger ghyristor circuit conducting (triggering during zero passage), the operating current overwhelming majority ghyristor circuit of flowing through, disjunction the second magnetic latching relay K2 again, last ghyristor circuit disconnects.
Embodiment 4
As shown in Figure 4, a kind of controllable silicon compound switch, comprise two unidirectional controllable silicon S CR1, SCR2, and the first electromagnetic switch K1, described two unidirectional controllable silicon S CR1, SCR2 have respectively control end G1 and control end G2, and two unidirectional controllable silicon S CR1, SCR2 reverse parallel connections also form the first terminals A1 and the second terminals A2, also comprise the second electromagnetic switch K2 and resistance R; The normally opened contact K2-1 of the second electromagnetic switch K2 connects with resistance R; Two ends by the normally opened contact K2-1 of the second electromagnetic switch K2 and the series circuit that resistance R consists of are in parallel with the first terminals A1 and the second terminals A2 that are also formed by two unidirectional controllable silicon S CR1, SCR2 reverse parallel connection; The two ends of the normally opened contact K1-1 of the first electromagnetic switch K1 are connected in parallel on the two ends of resistance R.
The first electromagnetic switch K1 of the present invention and the second electromagnetic switch K2 are relay or contactor.Certainly, the present invention preferentially selects magnetic latching relay.
When embodiment 4 uses, below all select magnetic latching relay as example take the first electromagnetic switch K1 and the second electromagnetic switch K2.Two unidirectional controllable silicon S CR1, the control end G1 that SCR2 has respectively and control end G2 are electrically connected with the corresponding triggering signal control end of controllable silicon drive circuit respectively, two unidirectional controllable silicon S CR1, the negative electrode of SCR2 and anode are electrically connected with the corresponding input of controllable silicon drive circuit respectively, the coil of the coil of the first magnetic latching relay K1 and the second magnetic latching relay K2 is electrically connected with the corresponding link of drive circuit of magnetic latching relay respectively, two unidirectional controllable silicon S CR1, SCR2 reverse parallel connection and the first terminals A1 and the second terminals A2 that form are electrically connected with reactive power compensation circuit or the corresponding link of motor-drive circuit respectively.
The course of work of embodiment 4: the ghyristor circuit elder generation conducting (voltage zero-cross conducting) that when dropping into, is consisted of by two unidirectional controllable silicon S CR1, SCR2 reverse parallel connection, first, second magnetic latching relay of rear closure K1, K2; When cutting out, disjunction the first magnetic latching relay K1, electric current forms voltage drop by the normally opened contact K2-1 of the second magnetic latching relay K2 and the series circuit of resistance R formation, between the first terminals A1 of the ghyristor circuit that is namely consisted of by two unidirectional controllable silicon S CR1, SCR2 reverse parallel connection and the second terminals A2 pressure drop is arranged, at this moment, trigger ghyristor circuit conducting (triggering during zero passage), the operating current overwhelming majority ghyristor circuit of flowing through, disjunction the second magnetic latching relay K2 again, last ghyristor circuit disconnects.
If embodiments of the invention 3 and embodiment 4 will be used for the high pressure occasion, the ghyristor circuit that two unidirectional controllable silicon S CR1 of the present invention, SCR2 reverse parallel connection consist of can be replaced to the series circuit of the ghyristor circuit of two unidirectional controllable silicon S CR1 of many groups, SCR2 reverse parallel connection formation.
The present invention can be applicable to the capacitance compensation field, and the occasion that needs the control circuit break-make.
Hence one can see that, the present invention is when cutting out, satisfied two ends during the controllable silicon SCR conducting pressure drop and two necessary conditions of triggering signal have been arranged, the electromagnetic switch contact is not fragile yet, greatly improved combination switch work reliability and operating efficiency, prolonged working life, power supply quality is high, can apply to frequent switching, requires response speed and the very large occasion of switching precision.
The above only is preferred implementation of the present invention; but be not limited to this; be noted that for those skilled in the art; under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. controllable silicon compound switch, comprise bidirectional triode thyristor SCR and the first electromagnetic switch K1, described bidirectional triode thyristor SCR has control end G and the first main terminal T1 and the second main terminal T2, and the two ends of the normally opened contact K1-1 of the first main terminal T1 of bidirectional triode thyristor SCR and the second main terminal T2 and the first electromagnetic switch K1 are in parallel, and it is characterized in that:
A, also comprise the second electromagnetic switch K2 and resistance R;
The normally opened contact K2-1 of b, the second electromagnetic switch K2 connects with resistance R;
C, be connected in parallel on the two ends of the normally opened contact K1-1 of the first electromagnetic switch K1 by the two ends of the normally opened contact K2-1 of the second electromagnetic switch K2 and the series circuit that resistance R consists of.
2. controllable silicon compound switch according to claim 1, it is characterized in that: described the first electromagnetic switch K1 and the second electromagnetic switch K2 are relay or contactor.
3. controllable silicon compound switch according to claim 1 and 2, it is characterized in that: described the first electromagnetic switch K1 and the second electromagnetic switch K2 are magnetic latching relay.
4. a controllable silicon compound switch comprises bidirectional triode thyristor SCR and the first electromagnetic switch K1, and described bidirectional triode thyristor SCR has control end G and the first main terminal T1 and the second main terminal T2, it is characterized in that:
A, also comprise the second electromagnetic switch K2 and resistance R;
The normally opened contact K2-1 of b, the second electromagnetic switch K2 connects with resistance R;
C, be in parallel by the normally opened contact K2-1 of the second electromagnetic switch K2 and series circuit that resistance R consists of and the first main terminal T1 and the second main terminal T2 of bidirectional triode thyristor SCR;
The two ends of the normally opened contact K1-1 of d, the first electromagnetic switch K1 are connected in parallel on the two ends of resistance R.
5. controllable silicon compound switch according to claim 4, it is characterized in that: described the first electromagnetic switch K1 and the second electromagnetic switch K2 are relay or contactor.
6. according to claim 4 or 5 described controllable silicon compound switch, it is characterized in that: described the first electromagnetic switch K1 and the second electromagnetic switch K2 are magnetic latching relay.
7. controllable silicon compound switch, comprise two unidirectional controllable silicon S CR1, SCR2, and the first electromagnetic switch K1, described two unidirectional controllable silicon S CR1, SCR2 have respectively control end G1 and control end G2, and two unidirectional controllable silicon S CR1, SCR2 reverse parallel connections also form the first terminals A1 and the second terminals A2, the two ends of the normally opened contact K1-1 of two unidirectional controllable silicon S CR1, SCR2 reverse parallel connection and the first terminals A1 that forms and the second terminals A2 and the first electromagnetic switch K1 are in parallel, and it is characterized in that:
A, also comprise the second electromagnetic switch K2 and resistance R;
The normally opened contact K2-1 of b, the second electromagnetic switch K2 connects with resistance R;
C, be connected in parallel on the two ends of the normally opened contact K1-1 of the first electromagnetic switch K1 by the two ends of the normally opened contact K2-1 of the second electromagnetic switch K2 and the series circuit that resistance R consists of.
8. controllable silicon compound switch according to claim 7, it is characterized in that: described the first electromagnetic switch K1 and the second electromagnetic switch K2 are relay or contactor.
9. controllable silicon compound switch, comprise two unidirectional controllable silicon S CR1, SCR2, and the first electromagnetic switch K1, described two unidirectional controllable silicon S CR1, SCR2 have respectively control end G1 and control end G2, and two unidirectional controllable silicon S CR1, SCR2 reverse parallel connections also form the first terminals A1 and the second terminals A2, it is characterized in that:
A, also comprise the second electromagnetic switch K2 and resistance R;
The normally opened contact K2-1 of b, the second electromagnetic switch K2 connects with resistance R;
C, by the two ends of the normally opened contact K2-1 of the second electromagnetic switch K2 and the series circuit that resistance R consists of be in parallel by two unidirectional controllable silicon S CR1, SCR2 reverse parallel connection and the first terminals A1 and the second terminals A2 that form;
The two ends of the normally opened contact K1-1 of d, the first electromagnetic switch K1 are connected in parallel on the two ends of resistance R.
10. controllable silicon compound switch according to claim 9, it is characterized in that: described the first electromagnetic switch K1 and the second electromagnetic switch K2 are relay or contactor.
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