CN104716738B - A kind of circuit for the automatic change-over electric appliance with duplicate for being used for CC grades - Google Patents

Abstract

The invention discloses a kind of circuit for the automatic change-over electric appliance with duplicate for being used for CC grades, it is characterized in crucial energy-saving circuit module there is provided capacity voltage dropping circuit and input selecting switch.Capacity voltage dropping circuit be provided with starting relay as short switch for contactor full voltage starting when use, and the relatively low contactor adhesive hold mode of power is then powered by capacity voltage dropping circuit, so as to realize that high voltage startup low pressure keeps energy saver mode, the main advantages of the present invention as follows：Energy-saving circuit module is connected and the matching of input selecting switch is used, can two A.C. contactors share an energy-saving circuit module, saved an energy-saving circuit module, simplified circuit structure, added the reliability of circuit；Cost power factor is saved close to 1, small power consumption；Good economy performance, cost performance are high, do not have A.C. contactor distinctive noise during operation, easy to manufacture, maintenance is also convenient for, and maintenance cost is low, energy-conserving and environment-protective.It can be used instead of PC grades of ATSE, with larger promotional value.

Description

A kind of circuit for the automatic change-over electric appliance with duplicate for being used for CC grades

Technical field

The present invention relates to a kind of low-voltage electrical apparatus, more particularly to a kind of dual power supply conversion using A.C. contactor as main switch is opened Powered-down device.

Background technology

The important events of some low-voltage distributions, for reduce because of power failure and caused by economic loss, powered using two road power supplys： Conventional, standby or standby each other, this two roads power supply can all be that power network is powered, and can also be powered all the way for power network, be all the way diesel oil Generator powered.When barrier is unable to normal power supply for some reason in power supply process for power supply all the way, its load is switched to another road The device of power supply is referred to as dual-power transfer switch electrical equipment, and abbreviation TSE, the device that its load is automatically handed over another road power supply claims For automatic transfer switching electric appliance, abbreviation ATSE.

At present, ATSE is typically made up of automatic change-over body and control circuit two parts, and being used primarily in does not allow to stop The important place of electricity.When the ATSE current power supply voltages or frequency for detecting load occurs more than the deviation of permission, ATSE automatically switches to another power supply and powered, it is ensured that load supplying is not interrupted.

TSE is generally classified as PC grades, CB grades and three ranks of CC levels, is defined as follows by short-circuit capacity：

CB grades --- the TSE of overcurrent release is equipped with, its main contact can be connected and for disjunction short circuit current flow.

CC grades --- it can connect and carry, but be not used in the TSE of disjunction short circuit current flow, the TSE is main to be contacted by meeting The electrical equipment of the national standard requirement of device is constituted.

PC grades --- it can connect and carry, but be not used in the TSE (notes of disjunction short circuit current flow：If PC grades can be met Test requirements document, contactor can be used for PC grades).

As understanding CC grade and PC grades substantially from definition, PC grades of a special case is considered as, is it by connecing Tentaculum is constituted.

CB grades of ATSE are not only in that disjunction short circuit current flow ability with PC grade ATSE differences, in machinery composition, contact material Select, there is also difference for security.CB grades of ATSE are made up of two breakers, be there are problems that slide fastener, are buckled again；Contact of breaker pressure Power is small, it is impossible to carrying short circuit tolerance electric current；Contact material uses oxidizable silver-colored tungsten, silver-colored tungsten carbide etc., and temperature rise is caused after oxidation Increase, switch may finally be caused to burn；There are problems that power supply superposition when also changing, residual current circuit breaker may be caused to jump Lock；When connecing fire-fighting load, national standard is not met《The control circuit of fixed fire-fighting pump controller》Middle regulation ATSE should not band Short circuit and the requirement of excess current protective function.After electrical apparatus release dropout disjunction short circuit current flow, it may appear that mains side has electricity, load-side is broken The situation of electricity, does not meet the power reguirements of I and II load.PC grades of ATSE overcome the problem of CB grades of ATSE are present, and such as it is touched Head pressure is difficult to be denounceed out greatly, and contact is difficult by melting welding, can bear more than 20Ie dash current, it is ensured that fire-fighting electric power system Deng the reliable power supply of important load.Contact material good in oxidation resistance, height flame resistant, such as silicon alloy, also using can from wiping point To clear up dust and oxide-film, service life is both improved, security performance is added again；Electric clearance, creep age distance allowance Greatly, thus its reliability is higher.

Current ATSE experienced for four stages at home.First stage is contactor type, belongs to CC grades, by two contactors and Its mechanically and electrically interlock constitute, reliability is low, power consumption is big, electrical engineering apply in replaced gradually.Second stage For breaker type, belong to CB grades, be made up of two breakers, motor drive mechanism and mechanical interlock mechanism, with short circuit or over current protection Protective function, volume is big, conversion speed is slow, mechanical interlocking reliability is not ideal enough, and the use for not meeting the places such as fire-fighting load will Ask, its application field has certain limitation.Phase III is on-load switch formula, belongs to PC grades, by two on-load switches and one The built-in interlocking mechanism of set combines, compact conformation, small volume, itself interlocking, conversion by magnet coil produce attraction Lai Driving switch, conversion speed is fast.Fourth stage is double-throw formula（Bikini）, PC grades are fallen within, main body is single-pole double throw integration Disconnecting switch, by built-in mechanical connection hold mode, conversion is driven by motor, and conversion is steady and speed is fast, it is simple in construction, It is small volume, itself interlocking, safe and reliable, and with zero passage bit function.

The current high ATSE of reliability not only requires to control Circuit Intelligent have various signals, fire-fighting link and communication to connect Mouthful, accuracy of detection is high, and the parameter setting scope such as voltage, frequency, delay time is wide, and Electro Magnetic Compatibility is good.Also require switch main body Shock resistance current capacity it is high, can frequent transitions, mechanical interlocking is reliable, conversion time is fast, zero-bit function, and isolation distance greatly, is held The voltage that is hit is high；The N poles of four-pole switch can first be closed to be divided afterwards, is occurred potential drifting on N lines during to prevent switching, is caused residual current Protection device misoperation.CB grades can not fully meet requirement, but PC grades of ATSE have that price is higher, maintenance cost, Typically only it can just be used in very important place.

Existing CC grades of ATSE improvement situation：Early stage CC grade ATSE majorities use auxiliary reclay or time relay conduct Control element builds the contactor on a control circuit, two major loops of control, realizes the conversion of two-way power supply.Ac contactor Device is a kind of highly developed industrial control electric appliance of technology, is mainly used in control motor start-up and stopping, can frequent movement, enough bear More than 20Ie peak impulse current.And the peak impulse current of motor start-up moment is generally 6e~7Ie, ATSE is main Loadtype majority is the mixed load such as illuminating lamp, UPS, and the moments that contact is connected, dash current is smaller, though for fire pump, The inductive loads such as smoke exhaust fan, because ATSE is switched fast, dash current is super not over 20Ie, contact hardly occurs and melts The situation of weldering.

Early stage ATSE mechanical interlocking and the undesirable defect of electric interlock reliability, enters to the voltage signal of each road power supply Row detection in real time, when there are the abnormal conditions such as decompression, under-voltage, over-pressed, carries out conversion operation automatically.Although Interlock Reliability is improved , but unresolved safety issue.

It is the operation principle based on " energization adhesive, powered holding, power-off release " as the A.C. contactor of key element On, i.e., when the coil is energized, static iron core produces electromagnetic attraction, by dynamic iron core adhesive, because contact system is and dynamic iron core Linkage, therefore dynamic iron core drives three movable contact springs to run simultaneously, the closing of contact, so as to switch on power.When the coil is de-energized, inhale Power is disappeared, and dynamic iron core linkage part is separated by the reaction force of spring, is disconnected main contact, is cut off the electricity supply.To realize it The course of work, technological design and is employed in corresponding structure, running, magnetic hystersis loss and vortex in iron core and short-circuited conducting sleeve Loss accounts for more than the 90% of total energy consumption, and power factor is low, and noise is big, and coil temperature rise is high, increases the electric energy on power network line Loss, reduces the service life of contactor coil.

In summary, the economical preferable advantages of CC grades of ATSE.Overcome the problem of Interlock Reliability is low at present, if The big weakness of its power consumption can be transformed with technological means row, the purpose of energy-conserving and environment-protective is reached, its temperature rise is reduced to improve its reliability, Then it is greatly improved its cost performance, it will the CC being replaced levels ATSE is radiated vigour again.

The content of the invention

There is drawbacks described above in the circuit for the automatic change-over electric appliance with duplicate for being currently used for CC grades for solution, the present invention is carried Quietly it is used for the circuit of CC grades of automatic change-over electric appliance with duplicate for a kind of reliability height, small power consumption, work.

To achieve the above object, the scheme taken of the present invention is：

A kind of circuit for the automatic change-over electric appliance with duplicate for being used for CC grades, including it is used as conventional power switch and standby Two A.C. contactors of power switch, and the control circuit that two A.C. contactors of control work；Wherein, located at conventional electricity The A.C. contactor at source switch end is defined as conventional contactor, and the A.C. contactor located at Backup Power Switch end is defined as standby Contactor；It is characterized in that：The control circuit includes the working power module powered for circuit system, at central data The control unit module of reason, the power supply voltage signal detection module being connected respectively with control unit module input, man-machine interaction Module and contactor working condition detection module, the working condition being connected respectively with control unit module output end show mould Block, output alarm signal module, the drive circuit module of the follow-up energy-saving circuit module work of control, are exported with drive circuit module End connect simultaneously export dc source driving A.C. contactor work energy-saving circuit module, and respectively with energy-saving circuit module and The input selecting switch of the output end connection of drive circuit module；Put into selecting switch and be provided with normally closed output end and normally opened output End, normally closed output end is connected with the coil input end of conventional contactor, normally opened output end and the coil input end of standby contactor Connection；Wherein, energy-saving circuit module is the direct current automatic switch-over circuit of exportable two kinds of voltage, in A.C. contactor adhesive It is exportable to ensure the higher direct current of A.C. contactor pick-up voltage and exportable after the completion of A.C. contactor adhesive ensure exchange Contactor keeps the relatively low direct current of attracting state voltage；Contactor working condition detection module respectively with conventional contactor and standby Connected with contactor.

As the improvement of such scheme, the contactor working condition detection module is located at conventional contactor and standby connect Auxiliary contact on tentaculum, the normally open contact and normally closed interlock that are linked with main contact that auxiliary contact is provided with.Touched by normally opened The connection of head and normally closed interlock, you can determine the state of main noddle on contactor；Regular alternating current also can be set using auxiliary contact to connect Tentaculum circuit interlock circuit, does not make further physical circuit explanation here.

The energy-saving circuit module is to control power supply to be changed into the circuit module of direct current from exchanging A.C. contactor, and it includes Be selected as the power selection switch of A.C. contactor power supply to commonly using power supply and stand-by power supply, exchange can be started and connect Tentaculum makees the instantaneous pressure start-up circuit of closed action, can low voltage keep the low pressure that A.C. contactor is kept closed Circuit；The input of power selection switch is connected with conventional power supply and stand-by power supply, the output end of power selection switch respectively with Instantaneous pressure start-up circuit is connected with the input of low pressure holding circuit, instantaneous pressure start-up circuit and low pressure holding circuit it is defeated Go out end with input selecting switch input to be connected.

The power selection switch be the power supply selective relay provided with two groups of normally closed normally open contacts, its normally closed interlock with often Connected with power supply, its normally open contact is connected with stand-by power supply.Power selection switch ensures that control circuit has two-way power supply to locate simultaneously In power supply state.Two groups of normally closed normally open contacts, it is ensured that have power supply normal power supply all the way, and occur without two-way power supply and power simultaneously, Cause to interfere with each other.

As a further illustration of the above scheme, the working power of control circuit is at least made up of two-way power supply, it is ensured that control The power supply all the way in office of circuit processed can normal work when breaking down；By power supply voltage signal detection module to two-way power supply Voltage signal is detected, to judge whether power supply status is normal；Contactor working condition detection module is simultaneously to two-way power supply A.C. contactor working condition detected, it is ensured that two contactor normal works；Control unit module according to testing result, Relevant information is handled, shown, and output control signal or alarm signal.Certainly, if Intelligent control circuit, may be used also With plus man-machine communication's platform.When result requires transformation into another road power supply, control unit module sends corresponding control Instruct to drive circuit module and selecting switch, drive circuit module disconnects the A.C. contactor of original mains side of devoting oneself to work Power supply is controlled, energy-saving circuit module dead electricity is output as zero, disconnects the contactor of former adhesive；Then quickly (can certainly root Enter line delay according to practical situations) connect another power supply of switching contactor control power supply, energy-saving circuit module obtain it is electric after, Full-voltage starting voltage after the rectification of output, to target contactor coil, makes A.C. contactor adhesive by selecting switch；Start After the completion of, power save circuit automatically switches to relatively low pulsating dc voltage, contactor is kept attracting state.

The use of energy-saving circuit module, makes the power factor of electromagnetic system after two A.C. contactor adhesives close to 1, power consumption Become very low, the range of decrease is up to more than 95%, and power savings are obvious, so as to realize the long-term continuous firing of contactor and keep low temperature Rise, perfection solve early stage CC grade ATSE Electromagnetic System of Contactor power consumption is big, coil temperature rise is high the problem of easily burn, increasing The strong service life of two A.C. contactors.Because the contact of two A.C. contactors is not simultaneously in closure state, section Can circuit module connection and the matching of input selecting switch use, can two A.C. contactors share an energy-saving circuit module, An energy-saving circuit module has been saved, circuit structure is simplified, the reliability of circuit has been added, saves cost.

For the ATSE without delay requirement, switching action can typically be completed in 0.2s, almost imperceptible power failure Feel, the appropriate selection preferable A.C. contactor of indices parameter and mix relatively reliable mechanical interlocks, completely can be with PC grades of ATSE indices are reached, can be used instead of PC grades of ATSE, its cost performance is high, are safeguarded more convenient.

It is worth further illustrating, the instantaneous pressure start-up circuit includes high-voltage rectifier bridge, and control moment height Press the starting relay of start-up circuit break-make；Low pressure holding circuit include sequentially connect capacity voltage dropping circuit, lower pressure rectifier bridge, High-low pressure isolating diode；Wherein, capacity voltage dropping circuit by be resistant to power frequency high voltage non-polar condenser and with the nonpolarity electricity Container discharge resistance composition in parallel；The common port of starting relay is connected with the first common port of power supply selective relay, high The input of pressure rectifier bridge is connected with the second common port of power supply selective relay and the normally opened output end of starting relay respectively, The second common port and the normally closed output end of starting relay of the input of capacity voltage dropping circuit respectively with power supply selective relay Connection；After high-voltage rectifier bridge output end is in parallel with foregoing high-low pressure isolating diode, pass through thermistor and input selecting switch Common port be connected.It is idle electronic component due to being depressured electric capacity used in capacity voltage dropping circuit, is not consumed in itself during work Active power, will not change the power supply sinusoidal waveform after decompression, and load characteristic is converted to capacitive character by original inductive load and born Carry, not but not pollution power network, do not play compensating action to power network also, produce positive effect.

Preferably, the non-polar condenser be CBB electric capacity, its pressure voltage be 240V ~ 1000V, its capacity be 0.1uF ~ 2.2uF.CBB electric capacity is polypropylene capactive, be using metal foil as electrode, by its with polypropylene film from two ends it is overlapping after, The capacitor of the construction of cylindrical shape is wound into, nonpolarity, insulation impedance is very high, and frequency characteristic is excellent, and dielectric loss very little. It is widely used on the circuit of resonance circuit, bypass circuit and high-frequency high-voltage.

Or, the non-polar condenser be safety electric capacity, its pressure voltage be 240V ~ 600V, its capacity be 0.1uF ~ 2.2uF.Safety electric capacity has after failure, will not cause electric shock, not jeopardize personal safety.

The contactor of different size is different with required holding force, correspondingly, and the operating current needed for its coil is not yet Together, generally between 5mA ~ 132mA, electric current when starting much smaller than it, similar contactor, its capacity is bigger, the electric capacity of selection The capacity of device is also bigger.

Be worth special instruction be：Due to contactor it is not closed when, its iron core is separated, i.e., dynamic iron core and electrostatic core be not Closure forms complete magnetic circuit, therefore static iron core needs larger magnetic force to attract to come by dynamic iron core when starting, after closure, Both form complete magnetic circuit, avoid the need for big magnetic force to maintain to be closed, and magnetic force flows through coil by electric current and produced, also It is to say, less electric current is only needed to after closure can maintain the closure state of contactor.Therefore, contactor or standby contact are commonly used Device is electrically actuated as high-pressure pulsating direct current after total head alternating current is rectified by after electricity, after A.C. contactor closure, cancels starting Signal, while be switched on capacity voltage dropping circuit, it is rectified after when providing long as low pressure Rectified alternating current for contactor coil Between the constant-current supply that works, capacity voltage dropping circuit key element non-polar condenser is wattless component, and itself does not consume wattful power Rate, does not also generate heat, while also load characteristic is converted, i.e., the inductive load of contactor coil is switched into capacitive load, The generation of harmonic wave is avoided, the harmonic pollution to power network is reduced.So the loss that hum bar comes all is eliminated, coil Temperature rise is also fallen too low therewith, and noise is also eliminated.

Starting circuit and reduction voltage circuit share a rectification circuit, are Rectified alternating current convert alternating current, then supply Coil,

Its principle of capacity voltage dropping circuit is actually to utilize capacitive reactance current limliting, and flowing through contactor coil by electric current produces magnetic force Carry out the attracting state of control contactor, its Current calculation formula is illustrated below.For example, being connected to 220V/50Hz exchange Voltage is as control voltage, when capacitance C is 1uF, if using the available electric current of full-wave rectification（Average value）For：I (AV)=0.89×V/Zc=0.89×220×2×∏×f×C =0.89×220×2×3.14×50×C=60000C = 60000×0.000001=0.06A=60mA。

The input selecting switch is, with the relay to few one group of normally open contact and normally closed interlock, to be defined as input choosing Select relay.

As the further improvement of such scheme, the conventional contactor and standby contactor include the iron as magnetic circuit Core, iron core is constituted for the pig iron or steel plate of monoblock.Because energy-saving circuit module is changed into A.C. contactor control power supply from exchanging Direct current, makes A.C. contactor to be worked in the way of high current adhesive low current sticking, is substantially exactly that A.C. contactor is worked as Used as D.C. contactor, Traditional DC contactor because its coil is taller and thinner and the scale of construction is relatively large, and avoid using identical The Traditional DC contactor of capacity, reduces the volume of contactor.It can make for the iron core in this ac contactor electromagnetic system Replace the of a relatively high silicon steel sheet of price with the relatively inexpensive material such as the pig iron or steel plate, and eliminate the short-circuited conducting sleeve on iron core, The intrinsic electromagnetic consumable of A.C. contactor " iron loss " and " copper loss " are so effectively eliminated, is also eliminated intrinsic during operation Exchange noise；Contactor processing technology without short-circuited conducting sleeve is decreased, brought by the damage of short-circuited conducting sleeve various therefore Barrier is also eliminated, and also saves material；Contactor coil operating voltage and electric current during due to sticking are greatly reduced, coil Line footpath also accordingly reduce, save copper material.A.C. contactor not only significantly reduces the power consumption of electromagnetic system after this transformation, The consumption of material is reduced, technique is simplified, cost is reduced, and low-down temperature rise also extends coil service life, Reliability and security is set to have qualitative leap.For rated current 400A above A.C. contactors, electric energy be up to 96% with On.

The line footpath of the coil of the conventional contactor and standby contactor is the line footpath of same specification ac contactor coil 90%.Due to direct current sucting speed than exchange sucting speed faster, electromagnetic attraction it is stronger, therefore in the feelings for keeping original working index Under condition, operating current can be more relatively small, is that the line footpath diminution of coil provides the foundation, in the constant situation of the number of turn of coil Under, be conducive to reducing the volume of coil, save the consumption of copper material, save resource, reduce cost.

The course of work is as follows：After upper electricity, when two-way power supply is all in normal condition, contactor closure is commonly used, by conventional electricity Source powers to the load, when decompression, phase shortage occur for conventional power supply or during under-voltage fault, and control unit module is to drive circuit module Input selecting switch is sent to send and go to standby contactor switching signal and contactor pickup signal, after contactor adhesive, contact Device pickup signal is released；Control unit module then sends contactor to drive circuit module and keeps pickup signal, realizes by standby Powered to the load with power supply.When conventional power up is normal, control unit module sends input selection to drive circuit module Switch, which is sent, goes to conventional contactor switching signal and contactor pickup signal, after contactor adhesive, contactor pickup signal solution Remove；Control unit module then sends contactor to drive circuit module and keeps pickup signal, realizes from commonly using power supply to load Power supply.

From the foregoing, it will be observed that the present invention mainly has the advantage that：The simple science of circuit, reliability is high, power factor is close to 1, work( Consumption is small；Not only good economy performance, cost performance are high, do not have A.C. contactor is distinctive to make an uproar in the absence of CB grades of ATSE defect, during operation Sound, easy to manufacture, maintenance is also convenient for, and maintenance cost is low, energy-conserving and environment-protective.It can be used instead of PC grades of ATSE, meet current low-carbon warp The social theme of Ji, also complies with the policy of current national energy-saving emission reduction, with larger promotional value.

Brief description of the drawings

Fig. 1 is schematic block circuit diagram of the invention..

Fig. 2 is Fig. 1 energy-saving circuit schematic diagram.

Main Reference label declaration：1st, instantaneous pressure start-up circuit 2, low pressure holding circuit 3, power selection switch 3.

Embodiment

Below in conjunction with the accompanying drawings and preferred embodiment, the present invention and its advantageous effects are carried out further specifically It is bright.

Embodiment 1：Referring to Fig. 1 ~ Fig. 2, the circuit for CC grades of automatic change-over electric appliance with duplicate is included as normal With the control electricity of power switch and two A.C. contactors of Backup Power Switch, and two A.C. contactor work of control Road；Wherein, the A.C. contactor located at conventional power switch end is defined as conventional contactor KM2, located at Backup Power Switch end A.C. contactor be defined as standby contactor KM1；Wherein, control circuit includes the working power mould powered for circuit system Block, the control unit module handled as central data, the power supply voltage signal being connected respectively with control unit module input Detection module, human-computer interaction module and contactor working condition detection module, are connected with control unit module output end respectively Working condition display module, output alarm signal module, the drive circuit module of control follow-up energy-saving circuit module work, with Drive circuit module output end connects and exports the energy-saving circuit module of dc source driving A.C. contactor work, and respectively The input selecting switch K2 being connected with the output end of energy-saving circuit module and drive circuit module；Selecting switch K2 is put into provided with normal Close output end and normally opened output end, normally closed output end is connected with conventional contactor KM2 coil input end, normally opened output end with it is standby Connected with contactor KM1 coil input end；Wherein, energy-saving circuit module automatically switches for the direct current of exportable two kinds of voltage Circuit, it is exportable in A.C. contactor adhesive to ensure the higher direct current of A.C. contactor pick-up voltage and A.C. contactor It is exportable after the completion of adhesive to ensure that A.C. contactor keeps the relatively low direct current of attracting state voltage；Contactor working condition is detected Module is connected with conventional contactor KM2 and standby contactor KM1 respectively.

Contactor working condition detection module is the auxiliary contact on conventional contactor KM2 and standby contactor KM1, The normally open contact and normally closed interlock that are linked with main contact that auxiliary contact is provided with.

Special instruction, energy-saving circuit module is the circuit mould for A.C. contactor control power supply being changed into from exchanging direct current Block, it includes be selected as the power selection switch 3 of A.C. contactor power supply to commonly using power supply and stand-by power supply, can Start A.C. contactor and make the instantaneous pressure start-up circuit 1 of closed action, can low voltage A.C. contactor is remained closed shape The low pressure holding circuit 2 of state；The input of power selection switch 3 is connected with conventional power supply and stand-by power supply, power selection switch 3 Input of the output end respectively with instantaneous pressure start-up circuit 1 and low pressure holding circuit 2 be connected, instantaneous pressure start-up circuit 1 It is connected with the output end of low pressure holding circuit 2 with input selecting switch K2 inputs.

Power selection switch 3 be the power supply selective relay K3 provided with two groups of normally closed normally open contacts, its normally closed interlock with often Connected with power supply, its normally open contact is connected with stand-by power supply.

Specifically, referring to Fig. 2, instantaneous pressure start-up circuit 1 includes high-voltage rectifier bridge BG2, and control instantaneous pressure is opened The starting relay K1 of the dynamic break-make of circuit 1；Low pressure holding circuit 2 include sequentially connect capacity voltage dropping circuit, lower pressure rectifier bridge, High-low pressure isolating diode D3；Wherein, capacity voltage dropping circuit is by being resistant to the non-polar condenser C1 of power frequency high voltage and electrodeless with this Property discharge resistance R1 compositions in parallel capacitor C1；Starting relay K1 common port is public with the first of power supply selective relay K3 End connection altogether, the second common port and starting relay of high-voltage rectifier bridge BG2 input respectively with power supply selective relay K3 K1 normally opened output end connection, the input of capacity voltage dropping circuit is respectively with power supply selective relay K3 the second common port and opening Motor type relay K1 normally closed output end connection；After high-voltage rectifier bridge BG2 output ends are in parallel with foregoing high-low pressure isolating diode D3, It is connected by thermistor Rt1 with putting into selecting switch K2 common port.

As important decompression device, non-polar condenser C1 is CBB electric capacity, and its pressure voltage is 240V ~ 1000V, and it holds Measure as 0.1uF ~ 2.2uF.Or non-polar condenser C1 is safety electric capacity, its pressure voltage is 240V ~ 600V, and its capacity is 0.1uF~2.2uF.Safety electric capacity is big due to allowance, from when, can be without considering the tolerances of pressure voltage, it is to avoid chose The excessive area of high pressure voltage busy line plate.It is, in general, that main switch contact capacity is bigger, the capacity of the capacitor of selection Also it is bigger.

Specifically, for the ATSE using main switch contact as 9A ~ 12A, the CJT1 systems that rated current is 9A ~ 12A be can select Row A.C. contactor；If during operating voltage 220V：It is that 400V, capacity are 0.33uF that non-polar condenser C1, which can select pressure voltage, CBB electric capacity；Or optional pressure voltage is the safety electric capacity that 240V, capacity are 0.33uF.If during operating voltage 380V：Nothing It is the CBB electric capacity that 630V, capacity are 0.15uF that polar capacitor C1, which can select pressure voltage,；Or optional pressure voltage be 400V, Capacity is 0.15uF safety electric capacity.

It is, with the relay to few one group of normally open contact and normally closed interlock, to be defined as input selection to put into selecting switch K2 Relay K2.

Conventional contactor KM2 and standby contactor KM1 includes the iron core as magnetic circuit, and iron core is the pig iron or steel plate of monoblock Constitute.

The line footpath of conventional contactor KM2 and standby contactor KM1 coil is the line footpath of same specification ac contactor coil 90%。

Embodiment 2：Referring to Fig. 2, the present embodiment is substantially the same manner as Example 1, and difference essentially consists in main switch contact The matching of capacity and capacity voltage dropping circuit：Specifically, for the ATSE using main switch contact as 16A ~ 25A, it can select specified electricity Flow the CJT1 Series AC Contactors for 9A ~ 12A；If during operating voltage 220V：Non-polar condenser C1 can select pressure voltage The CBB electric capacity for being 0.47uF for 400V, capacity；Or optional pressure voltage is the safety electric capacity that 240V, capacity are 0.47uF.Work If make voltage 380V：It is the CBB electric capacity that 630V, capacity are 0.22uF that non-polar condenser C1, which can select pressure voltage,；Or Optional pressure voltage is the safety electric capacity that 400V, capacity are 0.22uF.

Book and specific embodiment do not constitute any limitation to the present invention according to the above description, and the invention is not limited in upper The embodiment that face is disclosed and described, to some modification and variation of the present invention, it should also which the right for falling into the present invention will In the protection domain asked.

Claims (6)

1. a kind of circuit for the automatic change-over electric appliance with duplicate for being used for CC grades, including it is used as conventional power switch and standby electricity Two A.C. contactors of source switch, and the control circuit that two A.C. contactors of control work；Wherein, located at conventional power supply The A.C. contactor of switch terminals is defined as conventional contactor, and the A.C. contactor located at Backup Power Switch end is defined as standby connect Tentaculum；It is characterized in that：The control circuit includes the working power module powered for circuit system, is handled as central data Control unit module, the power supply voltage signal detection module being connected respectively with control unit module input, man-machine interaction mould Block and contactor working condition detection module, the working condition display module being connected respectively with control unit module output end, Output alarm signal module, the drive circuit module of the follow-up energy-saving circuit module work of control, with drive circuit module output end Connect and export dc source driving A.C. contactor work energy-saving circuit module, and respectively with energy-saving circuit module and drive The input selecting switch of the output end connection of dynamic circuit module；Put into selecting switch and be provided with normally closed output end and normally opened output end, Normally closed output end is connected with the coil input end of conventional contactor, and normally opened output end and the coil input end of standby contactor connect Connect；Wherein, energy-saving circuit module is the direct current automatic switch-over circuit of exportable two kinds of voltage, can in A.C. contactor adhesive Output ensures the higher direct current of A.C. contactor pick-up voltage and exportable after the completion of A.C. contactor adhesive ensures that exchange connects Tentaculum keeps the relatively low direct current of attracting state voltage；Contactor working condition detection module respectively with conventional contactor and standby Contactor is connected；The contactor working condition detection module touches for the auxiliary on conventional contactor and standby contactor Head, the normally open contact and normally closed interlock that are linked with main contact that auxiliary contact is provided with；The energy-saving circuit module is exchange Contactor control power supply is changed into the circuit module of direct current from exchanging, and it includes being selected as conventional power supply and stand-by power supply The power selection switch of A.C. contactor power supply, can start the instantaneous pressure startup electricity that A.C. contactor makees closed action Road, can low voltage make the low pressure holding circuit that A.C. contactor is kept closed；The input of power selection switch with often Be connected with power supply with stand-by power supply, the output end of power selection switch respectively with instantaneous pressure start-up circuit and low pressure holding circuit Input be connected, the output end of instantaneous pressure start-up circuit and low pressure holding circuit is connected with putting into selecting switch input； The power selection switch is the power supply selective relay provided with two groups of normally closed normally open contacts, and its normally closed interlock connects with conventional power supply Connect, its normally open contact is connected with stand-by power supply；The instantaneous pressure start-up circuit includes high-voltage rectifier bridge, and control moment height Press the starting relay of start-up circuit break-make；Low pressure holding circuit include sequentially connect capacity voltage dropping circuit, lower pressure rectifier bridge, High-low pressure isolating diode；Wherein, capacity voltage dropping circuit by be resistant to power frequency high voltage non-polar condenser and with the nonpolarity electricity Container discharge resistance composition in parallel；The common port of starting relay is connected with the first common port of power supply selective relay, high The input of pressure rectifier bridge is connected with the second common port of power supply selective relay and the normally opened output end of starting relay respectively, The second common port and the normally closed output end of starting relay of the input of capacity voltage dropping circuit respectively with power supply selective relay Connection；After high-voltage rectifier bridge output end is in parallel with foregoing high-low pressure isolating diode, pass through thermistor and input selecting switch Common port be connected.

2. it is used for the circuit of CC grades of automatic change-over electric appliance with duplicate as claimed in claim 1, it is characterized in that：The nothing Polar capacitor is CBB electric capacity, and its pressure voltage is 240V~1000V, and its capacity is 0.1uF~2.2uF.

3. it is used for the circuit of CC grades of automatic change-over electric appliance with duplicate as claimed in claim 1, it is characterized in that：The nothing Polar capacitor is safety electric capacity, and its pressure voltage is 240V~600V, and its capacity is 0.1uF~2.2uF.

4. the circuit of the automatic change-over electric appliance with duplicate for being used for CC grades as described in any one of claims 1 to 3, its feature It is：The input selecting switch be with the relay to few one group of normally open contact and normally closed interlock, be defined as input selection after Electrical equipment.

5. it is used for the circuit of CC grades of automatic change-over electric appliance with duplicate as claimed in claim 4, it is characterized in that：It is described normal Included constituting for the pig iron or steel plate of monoblock as the iron core of magnetic circuit, iron core with contactor and standby contactor.

6. it is used for the circuit of CC grades of automatic change-over electric appliance with duplicate as claimed in claim 5, it is characterized in that：It is described normal Line footpath with contactor and the coil of standby contactor is the line footpath 90% of same specification ac contactor coil.