CN105810506A - Energy circulation control system for low-voltage electromagnetic switch - Google Patents
Energy circulation control system for low-voltage electromagnetic switch Download PDFInfo
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- CN105810506A CN105810506A CN201610229326.0A CN201610229326A CN105810506A CN 105810506 A CN105810506 A CN 105810506A CN 201610229326 A CN201610229326 A CN 201610229326A CN 105810506 A CN105810506 A CN 105810506A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
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Abstract
The invention relates to an energy circulation control system for a low-voltage electromagnetic switch. The control system adopts two mutually-separated magnetic circuit structures; under independent closed loop control action, a closed loop feedback idea is used in the whole switch movement process; on the basis, an energy management idea is fused to establish an energy circulation coordination control system; a cyclic utilization channel for the magnetic energy of the electromagnetic system, the heat of a contact system, and the circuit load residual energy is established; units for collecting, transferring and storing energy are designed; an energy management mechanism is adopted; a control policy is formed under the fault conditions of sudden increase or sudden drop of voltages, and the like; rapid transfer of the contact energy is realized; and the breaking capacity of the switch is improved.
Description
Technical field
The present invention relates to a kind of low voltage electromagnetic switch energy cyclic control system.
Background technology
For the challenge of reply global energy safety, environmental pollution and climate change, following power distribution network just enters the rear carbon period of " the Internet+distributed energy ", and actively development energy the Internet is one of China's main policies of tackling energy revolution next time.The introducing of new forms of energy, intelligent management and the Appropriate application of traditional energy, electrical equipment self energy-conservation and mutually coordinated, be all the hot issue of research at present.Improving electric energy at the proportion of final energy consumption, utilize the regenerative resources such as scattered wind energy, solar energy, the development distributed generation system for the treatment of in accordance with local conditions, is the important channel realizing energy the Internet.Randomness and intermittence due to renewable energy power generation; not only can bring the voltage pulsation of distribution network systems, frequency fluctuation; it is also possible to cause the series of problems such as the malfunction of protection system, tripping, sensitivity decrease, to controlling switch and protecting switch to propose new requirement in system.And existing using electricity system and electrical equipment carrying out energy management with energy-saving run is another important channel realizing energy the Internet.Current low voltage control protection switch to be expanded New function on the one hand and adapt to the demand of energy the Internet; realize Energy harvesting by the structural design of self and Based Intelligent Control on the other hand to maximize; self energy-saving and cost-reducing is used ultimate attainment, form New Generation of Intelligent and control device for switching.
The electric energy 80% that generating equipment produces according to statistics is above being transmitted by low-tension switch electric appliance and consuming, and low-tension switch electric appliance is generally as corollary equipment in power system, and demand is huge.Often newly-increased 10,000 kilowatts of generating capacity, about need 60,000 8 ten thousand low-voltage equipments matched, and its energy-saving and cost-reducing energy conservation with self has very important effect.Traditional low-tension switch electric appliance can be summarized as electrical power distribution apparatus according to its status residing in electric wiring and effect and control electrical equipment.External from the eighties in 20th century, China begins at from the nineties in 20th century and has progressively developed a collection of profile, structure, installation etc. low voltage terminal using electricity system and have common trait the low-voltage electrical apparatus established one's own system, and is commonly referred to terminal appliance.No matter it is electrical power distribution apparatus, controls electrical equipment, or terminal appliance, electromagnetic switch is all the class that consumption is maximum.It is made up of electromagnetic system, contact system and operating mechanism.Tradition electromagnetic switch has the disadvantage in that
(1) dynamic property is by the impact of exchange phase angle
The randomness of electromagnetic mechanism closing phase angle result in all change at random such as exciting curent in attracting process, speed unshakable in one's determination, will appear from difficult phenomenon of closing a floodgate, affect the reliability of switch under some phase angle；Though and can reliably close a floodgate under other phase angles, but sound iron core impact energy can be caused excessive, produce serious contact bounce, affect its electric life.
(2) operating voltage range is narrow, and reactance voltage falls ability
The rated voltage that running voltage national regulations is (85%～110%) of electromagnetic appliance, is easily generated lasting iron coring vibration, causes contact melting welding when critical pick-up voltage；Overtension or the too low temperature rise being likely to cause coil and iron core simultaneously rises, and power consumption increases, and even results in coil scaling loss.The field such as new forms of energy and on-board running cannot be adapted to.
Power system is in running, due to thunderbolt, short trouble reclosing, enterprise external or the reason such as internal electric network fault, main equipment starting, supply voltage is caused to rapidly drop to the 90%～10% of rated value, persistent period is 10ms to 1min, this phenomenon is called " Voltage Drop ", is commonly called as " shaking electric ".If coil voltage can cause contact separating brake lower than minimum dropout 5～10ms, business equipment unplanned shutdown can be made, cause huge economic loss.The field that oil, mine etc. are run continuously is huge.
(3) there is ac operation noise
The sinusoidal variations of alternating electromagnetic electric apparatus coil voltage cycle, causes the magnetic flux in electromagnetic mechanism, suction also periodic sinusoidal variations, and when suction is less than counter-force, iron core will produce vibration and noise；Divided magnetic ring is to solve the major measure of vibration and noise under ac electromagnetism system closure state at present, but the membership that adds of divided magnetic ring brings difficulty to design and the analysis of electromagnetic system simultaneously；The existence of divided magnetic ring can bring added losses and additional temperature rise to coil and iron core；Divided magnetic ring easy fracture, affects mechanical life.
(4) electromagnetic system temperature rise is higher
Electromagnetic system magnetic history can occur hysteresis, produce magnetic hystersis loss, when ac-excited, there is forward and reverse alternately and repeatedly magnetization, cause the periodicity magnetic hystersis loss can not ignore；In iron core periodically variable magnetic flux also can inductive loop, produce eddy-current loss；The core construction adopting stalloy is the major measure reducing magnetic hysteresis, eddy-current loss at present.Though Large Copacity electromagnetic appliance takes above measure, but most maintenance power consumption is still lost on magnetic hysteresis, eddy current and short-loop loss, makes electromagnetic system temperature rise higher, affects job security and energy-saving effect.Therefore, DC start, direct current sticking electromagnetic system duty be the commonly used control model of Based Intelligent Control.
(5) there is coil manipulation overvoltage
Alternating electromagnetic electrical equipment is when automatically controlling, and many employing its coils of Control carry out long-range divide-shut brake, owing to coil load is perceptual by force, will produce serious overvoltage when disjunction.Along with the raising of industry control automatization level, there is increasing electronic circuit in power distribution circuit, coil overvoltage may interfere with the normal operation of these circuit, even causes permanent damage.
As can be seen here, electromagnetic switch is in running, needed for adhesive stage, sticking stage, disjunction stage, energy has very big difference, and for the electromagnetic switch of frequent operation, its adhesive stage needs bigger energy, overcome system counter-force, band movable contact system closes, and the sticking stage has only to an only small energy, maintains switch and is in sticking state, in the disjunction stage, switch is required for normal disjunction circuit and selects different disjunction patterns with fault disjunction circuit conditions.
The nineties starts, and the Study of intelligent of low-voltage electrical apparatus is worked and is just already in full swing by industry.By intelligent control module realize to the Switch main body adhesive stage, the sticking stage, the disjunction stage Whole Process Control, improve the overall performance index of switch.The intelligentized control method of electromagnetic treadle and designing technique are paid close attention in recent years widely.The control model of the intelligent contactor electromagnetic mechanism " D.C. high-current segmentation adhesive, DC low current sticking " that early stage proposes, exists for Large Copacity catalyst and necessarily controls difficulty.For 630A A.C. contactor, adopting the strong excitatory adhesive pattern of direct current, its coil starting current peak value is up to about 150A, and so big starting current will make electromagnetic mechanism be in blasting state, and the magnetic circuit even causing electromagnetic mechanism is saturated, and adhesive power increases.Meanwhile, the switching tube controlling attracting process in electronic module will bear huge dash current, and the current stress of switching tube, cost, reliability are affected by impact.And, contactor coil belongs to inductive load, coil current can not suddenly change, the operating current of this control mode differs decades of times with holding current, by high pressure adhesive in the process of low pressure sticking, coil current to be decayed to holding current continuously by operating current, if adopting the powering mode of Switching Power Supply, the big electric current of switching moment pulls out from Switching Power Supply secondary, likely trigger the overcurrent protection function of Switching Power Supply or drag down the output voltage of Switching Power Supply, cause the job insecurity of whole system, even system reset, too increase the anti-interference difficulty of control circuit simultaneously.Therefore, adopt the intelligent contactor control model of PWM, obtain accreditation and development in recent years.
Perin, the scholars such as foreign scholar and domestic Xi'an Communications University such as A.J, by quickly detecting voltage or the electric current at coil two ends, compare with reference value as feedback signal, thus regulating electronic power switch cycle or dutycycle, closed loop regulates the excitatory magnetic potential being applied to coil two ends.The Espinosa of Univ Catalunya Politecnica of Spain, this thinking has been improved and has been furtherd investigate by the scholars such as A.G, and propose dynamic real-time displacement estimating techniques unshakable in one's determination in conjunction with equivalent magnetic circuit and coil inductance, fuzzy control strategy is adopted to draw the duty ratio calculation method in PWM each cycle, achieve the displacement closed loop control of A.C. contactor, decrease the contact bounce of starting process.Dynamic speed closed loop unshakable in one's determination is incorporated into Large Copacity A.C. contactor starting process and controls in real time by University of Fuzhou, the electric current descending slope caused by detecting dynamic motion back-emf unshakable in one's determination reflects dynamic speed unshakable in one's determination indirectly, current inner loop is controlled at the dynamic speed outer shroud unshakable in one's determination of starting process, thus Impact energy is directly controlled, drastically reduce the area starting process contact bounce.ABB AB of Switzerland have developed AF, GAF series AC and DC catalyst introducing control circuit in contactor electromagnetic mechanism, adopt PWM Closed loop Control, Width funtion Working concepts is incorporated into catalyst industrial control field, add threshold voltage adhesive, avoid shivering after the critical voltage critical adhesive of generation contact, scaling loss contact, so that its performance indications promote, adapts to the control field of new forms of energy；The AB company of the U.S. is based in the current closed-loop constant current starting scheme of low cost, catalyst coil current disjunction continuous current circuit is carried out corresponding design, after receiving breaking signal, automatically opens up degaussing loop, rapid release coil magnetic energy, it is to avoid the release delay problem that Based Intelligent Control is brought.
Intelligent control technology and the combination of intelligent design technology, result in the miniaturization of Switch main body structure and modularity so that incorporates energy circulation control system in the switch and is possibly realized.
Summary of the invention
It is an object of the invention to provide a kind of low voltage electromagnetic switch energy cyclic control system, to overcome the defect existed in prior art.
For achieving the above object, the technical scheme is that a kind of low voltage electromagnetic switch energy cyclic control system, including: the first electromagnetic module, the second electromagnetic module, contact module, control module, energy conversion module, hybrid energy-storing unit and two-way DC/DC module；The power end of described first electromagnetic module and the power end of described second electromagnetic module are all connected with a rectification filtering unit；Described rectification filtering unit and an AC/DC power supply are connected；Described rectification filtering unit and described AC/DC power supply are all connected with described control module through voltage sampling circuit；One end of described first electromagnetic module and described second electromagnetic module is connected with described control module；The other end of described first electromagnetic module and described second electromagnetic module and one end of a link gear are connected, and the other end of described link gear is connected with one end of described contact module；The other end of described contact module is connected with described energy conversion module one end；The other end of described energy conversion module is connected with one end of hybrid energy-storing unit；The other end of described hybrid energy-storing unit accesses described rectification filtering unit after being connected with described two-way DC/DC module one end；The described two-way DC/DC module other end is also connected with described control module.
In an embodiment of the present invention, described first electromagnetic module and described second electromagnetic module include the main circuit, electromagnetic mechanism and the sample circuit that are sequentially connected；Described main circuit includes the energizing loop, continuous current circuit and the energy regenerative loop that are connected respectively with described rectification filtering unit；Described electromagnetic mechanism is connected with described energizing loop, described continuous current circuit and described energy regenerative loop respectively；Described sample circuit includes the current sampling circuit and the voltage sampling circuit that are connected respectively with described electromagnetic mechanism, and described current sampling circuit and voltage sampling circuit are all connected with the sampling unit in described control module, the real-time operation unit being connected with the described sampling unit current signal to gathering and voltage signal are calculated, and generate drive control signal by the real-time controlling unit being connected with described real-time operation unit, through energizing loop described in the first drive unit drives, described continuous current circuit and energy regenerative loop, and then control the exciting curent of electromagnetic mechanism.
In an embodiment of the present invention, the electromagnetic force that the electromagnetic mechanism in described first electromagnetic module and the electromagnetic mechanism in described second electromagnetic module produce after being energized is contrary.
In an embodiment of the present invention, described energy conversion module includes the energy acceptance unit, receiving coil, compensation network and the power inverter that are sequentially connected；Described energy acceptance unit is connected with the form of field domain by described receiving coil with described compensation network, and it is used for the dump energy after receiving the energy of described contact module breaking course electric arc generation and disjunction circuit, described power inverter is connected with described hybrid energy-storing unit, is used for regulating and controlling described contact module energy.
In an embodiment of the present invention, described rectification filtering unit is connected to the sampling unit in described control module through the 4th voltage sampling circuit, the voltage of rectification filtering unit DC terminal described in described 4th sampling circuit samples, judges whether to start DC/DC changer for described sampling unit.
In an embodiment of the present invention, described AC/DC power supply is connected to the sampling unit in described control module through tertiary voltage sample circuit, the magnitude of voltage of described AC/DC power supply is sampled by described tertiary voltage sample circuit, and described sampling unit is using the sampled voltage judgment threshold as electromagnetic mechanism adhesive in described first electromagnetic module and described second electromagnetic module and disjunction.
In an embodiment of the present invention, described two-way DC/DC module includes a two-way DC/DC changer, and described two-way DC/DC changer one end is connected with described rectification filtering unit DC terminal, and the other end is connected with described hybrid energy-storing unit.
In an embodiment of the present invention, when described sampling unit judges that described rectification filtering unit DC terminal voltage exceedes upper limit secure threshold voltage, described two-way DC/DC changer starts, and working in decompression mode, described hybrid energy-storing unit is charged by described rectification filtering unit DC terminal voltage through decompression transformation；Real-time controlling unit in described control module exports the first voltage reference value through a D/A converting circuit, and this first voltage reference value forms the first outer voltage in conjunction with the voltage feedback value of described two-way DC/DC changer with the output of described hybrid energy-storing unit junction after error is amplified；This first outer voltage provides one first current reference value after one first compensation loop, and compares with the feedback current in described hybrid energy-storing unit charging process, forms the first current inner loop；This first current inner loop outputs control signals to one second driver element, and by described two-way DC/DC changer, the voltage and current of output to described hybrid energy-storing unit is carried out dynamic stability adjustment, until described rectification filtering unit DC terminal voltage is lower than described upper limit secure threshold voltage, close described two-way DC/DC changer.
In an embodiment of the present invention, when described sampling unit judges described rectification filtering unit DC terminal voltage lower than lower limit secure threshold voltage, described two-way DC/DC changer starts, and working in boost mode, described rectification filtering unit DC terminal is discharged by described hybrid energy-storing unit through boosting inverter；Real-time controlling unit in described control module exports the second voltage reference value through a D/A converting circuit, and this second voltage reference value forms the second outer voltage after the voltage feedback value in conjunction with described two-way DC/DC changer and the output of described rectification filtering unit DC terminal junction；This second outer voltage provides one second current reference value after one second compensation loop, and compares with the feedback current in described hybrid energy-storing cell discharge process, forms the second current inner loop；This second current inner loop outputs control signals to one second driver element, and by described two-way DC/DC changer, output to described rectification filtering unit DC terminal voltage is carried out dynamic stability adjustment.
Compared to prior art, the method have the advantages that
1, collection of energy, transfer, memory module are set up, for the electromagnetic system magnetic potential in motor process acute variation, unnecessary magnetic energy feedback is stored in hybrid energy-storing unit, back-up source during as Voltage Drop, fault disjunction, the power providing control system supports, and improves and controls module reliability of operation and complete machine operational efficiency；
2, there is contact module energy collection unit, set up energy management mechanism, formed between electromagnetic system, contact system energy recycle passage, realize switch energy dynamically to manage, solve the contradiction between switch frequent operation and high breaking capacity, be particluarly suitable in the field such as new forms of energy, electric automobile and apply；
3, electromagnet system adopts back-to-back magnetic structure, there is the independent magnetic circuit being separated from each other, two electromagnetic systems have each independent closed loop control link in the control module, thus controlling electromagnetic system to produce the electromagnetic force that direction is different, changing tradition electromagnetic system relies on merely relieving mechanism to carry out the pattern of disjunction, it is achieved frequent operation and high breaking capacity control flexibly.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the low voltage electromagnetic switch energy cyclic control system in the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme is specifically described.
The present invention provides a kind of low voltage electromagnetic switch energy cyclic control system, as it is shown in figure 1, XP is system input AC/DC power supply, for the DC source of exchange or any polarity, when adopting alternating current power supply, is converted to unidirectional current by rectification filtering unit；During according to DC source, any polarity accesses the unidirectional current all can determined by rectification filtering unit output polarity, but do not carry out rectified action, ZL is rectification filtering unit, DJ1 is that can to produce the electromagnetic mechanism 1, JC1 of electromagnetic attraction after energising be energizing loop 1, XL1 be continuous current circuit 1, KN1 is energy regenerative loop 1, and three forms the closed loop control main circuit 1 of electromagnetic mechanism 1；DL1 is current sampling circuit 1, DY1 is voltage sampling circuit 1, for gathering the electric current of electromagnetic mechanism 1, voltage signal as feedback parameters；DJ2 can produce the electromagnetic mechanism 2 of back-electromagnetic force after being switched on, counter-force direction is be energizing loop 2, XL2 be continuous current circuit 2, KN2 compared to electromagnetic mechanism 1, JC2 is energy regenerative loop 2, and three forms the closed loop control main circuit 2 of electromagnetic mechanism 2；DL2 is current sampling circuit 2, DY2 is voltage sampling circuit 2, for gathering the electric current of electromagnetic mechanism 2, voltage signal as feedback parameters；QD1 is drive circuit 1, controls module and sends control signal by drive circuit 1 to main circuit 1 and main circuit 2；CT is contact module, and contact module is used for conducting and the disjunction of line load；LD is link gear, and electromagnetic mechanism 1 and electromagnetic mechanism 2 are connected with contact module by link gear after connecting, and band moving contact moves；DY3 is voltage sampling circuit 3, and Gather and input power supply signal is as the judgment threshold of electromagnetic switch adhesive, disjunction；HC is hybrid energy-storing unit, for storing the electromagnetic system collected and contact system energy, the quick release of energy when needs；DC/DC is the main circuit with bi-directional power conversion, referred to as two-way DC/DC changer, is responsible for regulating the trend of power between rectification filtering module and hybrid energy-storing unit；WH1 is outer voltage 1, BH1 be compensation loop 1, NH1 be current inner loop 1, LC1 is the current feedback of charging process, and QD2 is drive circuit 2, DC1 is the Voltage Reference 1 during decompression mode, collectively constitutes control loop during two-way DC/DC changer decompression mode；The current feedback 2, DC2 of WH2 is outer voltage 2, BH2 be compensation loop 2, NH2 to be current inner loop 2, LC2 be discharge process is the Voltage Reference 2 during boost mode, collectively constitutes control loop during two-way DC/DC converter boost pattern；JS is energy acceptance unit, is used for the dump energy after receiving the energy of contact breaking course electric arc generation and disjunction circuit, and T1 is receiving coil, and BS is for compensating network, and GL is the power inverter for contact regulation of energy；Sampling unit CY, real-time operation unit YS and real-time controlling unit KZ collectively constitute digital core, and digitized programming in logic and the feedback parameters of being responsible for overall system control calculate, output drive signal；SM is D/A converter module, and the output signal of digital core is converted into analog references amount.DY4 is voltage sampling circuit 4, the voltage of sampling rectifying and wave-filtering DC terminal, is used for judging whether to start DC/DC changer.
Further, in the present embodiment, AC/DC power supply is, after any polar orientation access control system, to become, through current rectifying and wave filtering circuit, the direct current that polar orientation is determined, definition, here for DC terminal, filters differential mode therein and common mode interference signal simultaneously.nullThe sampling unit of voltage sampling circuit 3 Gather and input power supply signal input digital core，Real-time controlling unit is sent into through real-time operation unit，Judge input power kind (exchange or direct current)、Judge whether to meet starting conditions simultaneously，If reaching the start voltage thresholds of electromagnetic switch，Then real-time controlling unit controls main circuit 1 by drive circuit 1 output drive signal，Start electromagnetic mechanism 1，The electric current of the electromagnetic mechanism 1 that sampling unit real-time reception feeds back from current sampling circuit 1 and voltage sampling circuit 1 and voltage signal in starting process，Magnetic circuit inductance value is calculated by real-time operation unit，Relation by magnetic circuit inductance Yu electromagnetic mechanism displacement，Calculate electromagnetic mechanism 1 movement velocity，Real-time controlling unit builds digital current loop，The movement velocity of electromagnetic mechanism 1 is the input of digital current loop，Electric current loop exports digital control parameter，Main circuit 1 is regulated by drive circuit 1，Energizing loop can allow exciting curent rise rapidly，Continuous current circuit makes exciting curent decline continuously and slowly，Energy regenerative loop makes exciting curent rapid decrease，Main circuit 1 according to the feedback result of movement velocity at energizing loop、Continuous current circuit、High frequency switching between energy regenerative loop，Thus adjusting the exciting curent of electromagnetic mechanism 1，Directly regulate electromagnetic attraction，Control contact closure speed，Realize closed loop control.After contact closure, electromagnetic mechanism 1 is switched to maintenance state, in this process, exciting curent sharply changes from big to small, and magnetic energy needs release rapidly, energy regenerative loop fully opens, unnecessary magnetic energy is fed back to rapidly the DC terminal after rectification with the form of exciting curent, causes that DC terminal voltage constantly rises, if not being any limitation as, there is the hidden danger damaging circuit, cause the failure of control.Voltage sampling circuit 4 monitors DC terminal voltage all the time, when DC terminal voltage is increased beyond safety range, start DC/DC changer and cut off input power simultaneously, now DC/DC changer is operated in decompression mode, hybrid energy-storing unit is charged by the voltage of DC terminal through decompression transformation: definition DC/DC changer is connected with DC terminal and is output as high-pressure side, and being connected with hybrid energy-storing unit is output as low-pressure side.Real-time controlling unit provides the voltage reference value 1 for decompression mode through D/A converting circuit, the voltage feedback value of DC/DC changer low-pressure side and voltage reference value 1 amplify through error and form outer voltage, current reference value is provided through compensation loop 1, compare with the feedback current 1 of charging process, form current inner loop, internal ring output control signal regulates DC/DC changer by drive circuit 2, the voltage and current of output to hybrid energy-storing unit can be carried out dynamic stability adjustment simultaneously, now hybrid energy-storing unit is charged by DC terminal voltage through decompression transformation, DC terminal voltage drops to safety range, complete the absorption process to electromagnetic mechanism energy, it is then turned off DC/DC changer, again input power is accessed, contact is in sticking state.
Further, in the present embodiment, when contact needs disjunction, the input power of control system is cut off, voltage sampling circuit 3 detects that supply voltage is lower than disjunction threshold value, real-time controlling unit drives energy regenerative loop 1 to open, electromagnetic mechanism 1 demagnetizes rapidly, main circuit 2 controls electromagnetic mechanism 2 and opens, owing to adopting back-to-back frame mode, magnetic circuit separates, and the electromagnetic force direction that therefore electromagnetic mechanism 2 produces is contrary with electromagnetic mechanism 1, adjustment process is identical with the adjustment process of above-mentioned electromagnetic mechanism 1, and description is not repeated herein.Owing to input power alreadyes switch off, although there being the energy feedback of electromagnetic mechanism 1, but owing to magnetic potential when electromagnetic mechanism 1 keeps is originally just less, it is not enough to supplement electromagnetic mechanism 2 completely and starts the energy needed, energy expenditure causes that DC terminal voltage constantly declines, voltage detecting 4 monitors voltage and drops to the threshold value of setting, opens DC/DC changer.Now DC/DC changer is in boost mode, and DC terminal is discharged by hybrid energy-storing unit through boosting inverter, and the disjunction for electromagnetic mechanism 2 provides energy.When changer is in boost mode, real-time controlling unit exports the boost mode voltage reference value 2 input as outer voltage 2 by digital-to-analogue conversion, the high side voltage value of feedback that another input is DC/DC changer of outer voltage 2, through compensation loop 2 input current ring, reference current value as current inner loop 2, the feedback current 2 that another input is discharge process of current inner loop 2, outer voltage 2 controls current inner loop 2, current inner loop 2 carries out dynamic regulation through 2 pairs of on high-tension side output voltages of overdriving, realize the electric energy release to DC terminal of hybrid energy-storing unit, electromagnetic mechanism 2 is carried out disjunction control by supply main circuit 2.The quick demagnetization of electromagnetic mechanism 1, accelerates the disappearance of retentivity, and same time counter-force is not only provided by spring, dynamically regulated by electromagnetic mechanism 2 simultaneously, keep the quick disappearance of suction and the growth of counter-force, shifting, control therefore, it is possible to contact to be carried out quickly controlled disjunction.In the electromagnetic mechanism process with moving contact disjunction, existence due to circuit inductive load, contact electric arc produces and sends strong electromagnetic field of high frequency, electromagnetism is carried out by energy collection unit, the collection of remaining energy, to emission, adjusting compensation network makes receiving coil be operated in resonant condition, improve the efficiency receiving electromagnetic energy, the unstable voltage signal that receiving coil is produced by power inverter is adjusted to suitable voltage signal, thus hybrid energy-storing unit is charged, synchronization, hybrid energy-storing unit supplies electromagnetic mechanism 2 disjunction action to DC terminal electric discharge, this process completes the contact transfer to electromagnetic mechanism energy.
Electromagnetic mechanism adopts back-to-back magnetic structure, has the independent magnetic circuit being separated from each other, thus producing the electromagnetic attraction that direction is different, changing conventional low electromagnetic switch and relying on merely relieving mechanism to carry out the pattern of disjunction.Two electromagnetic mechanisms have each independent closed loop control link, the thinking of closed loop feedback is run through the breaking course of whole contact, in the disjunction stage, the impact velocity that just-off speed, the movement velocity of breaking course, disjunction terminate is carried out the real-time monitoring of different phase；Simultaneously by setting up rational energy management mechanism, set up the contact energy transfering channel to electromagnetic mechanism, reduce electric arc harm, power is provided to support for electromagnetic mechanism on the one hand, reduce the power output of input power, absorb electromagnetic mechanism on the other hand from magnetic energy unnecessary in motor control process, accelerate dynamic response the acceleration switch disjunction process of exciting curent, energy feedback is stored.
It is above presently preferred embodiments of the present invention, all changes made according to technical solution of the present invention, when produced function is without departing from the scope of technical solution of the present invention, belong to protection scope of the present invention.
Claims (9)
1. a low voltage electromagnetic switch energy cyclic control system, it is characterised in that including: the first electromagnetic module, the second electromagnetic module, contact module, control module, energy conversion module, hybrid energy-storing unit and two-way DC/DC module；The power end of described first electromagnetic module and the power end of described second electromagnetic module are all connected with a rectification filtering unit；Described rectification filtering unit and an AC/DC power supply are connected；Described rectification filtering unit and described AC/DC power supply are all connected with described control module through voltage sampling circuit；One end of described first electromagnetic module and described second electromagnetic module is connected with described control module；The other end of described first electromagnetic module and the second electromagnetic module and one end of a link gear are connected, and the other end of described link gear is connected with one end of described contact module；The other end of described contact module is connected with described energy conversion module one end；The other end of described energy conversion module is connected with one end of described hybrid energy-storing unit；The other end of described hybrid energy-storing unit accesses described rectification filtering unit after being connected with described two-way DC/DC module one end；The described two-way DC/DC module other end is also connected with described control module.
2. low voltage electromagnetic switch energy cyclic control system according to claim 1, it is characterised in that described first electromagnetic module and described second electromagnetic module include the main circuit, electromagnetic mechanism and the sample circuit that are sequentially connected；Described main circuit includes the energizing loop, continuous current circuit and the energy regenerative loop that are connected respectively with described rectification filtering unit；Described electromagnetic mechanism is connected with described energizing loop, described continuous current circuit and described energy regenerative loop respectively；Described sample circuit includes the current sampling circuit and the voltage sampling circuit that are connected respectively with described electromagnetic mechanism, and described current sampling circuit and voltage sampling circuit are all connected with the sampling unit in described control module, the real-time operation unit being connected with the described sampling unit current signal to gathering and voltage signal are calculated, and generate drive control signal by the real-time controlling unit being connected with described real-time operation unit, through energizing loop described in one first drive unit drives, described continuous current circuit and energy regenerative loop, and then control the exciting curent of electromagnetic mechanism.
3. low voltage electromagnetic switch energy cyclic control system according to claim 2, it is characterised in that the electromagnetic mechanism in described first electromagnetic module and the electromagnetic force produced after the energising of the electromagnetic mechanism in described second electromagnetic module are contrary.
4. low voltage electromagnetic switch energy cyclic control system according to claim 1, it is characterised in that described energy conversion module includes the energy acceptance unit, receiving coil, compensation network and the power inverter that are sequentially connected；Described energy acceptance unit is connected with the form of field domain by described receiving coil with described compensation network, and it is used for the dump energy after receiving the energy of described contact module breaking course electric arc generation and disjunction circuit, described power inverter is connected with described hybrid energy-storing unit, is used for regulating and controlling described contact module energy.
5. low voltage electromagnetic switch energy cyclic control system according to claim 1, it is characterized in that, described rectification filtering unit is connected to the sampling unit in described control module through the 4th voltage sampling circuit, the voltage of rectification filtering unit DC terminal described in described 4th sampling circuit samples, judges whether to start DC/DC changer for described sampling unit.
6. low voltage electromagnetic switch energy cyclic control system according to claim 5, it is characterized in that, described AC/DC power supply is connected to the sampling unit in described control module through tertiary voltage sample circuit, the magnitude of voltage of described AC/DC power supply is sampled by described tertiary voltage sample circuit, and described sampling unit is using the sampled voltage judgment threshold as electromagnetic mechanism adhesive in described first electromagnetic module and described second electromagnetic module and disjunction.
7. low voltage electromagnetic switch energy cyclic control system according to claim 6, it is characterized in that, described two-way DC/DC module includes a two-way DC/DC changer, described two-way DC/DC changer one end is connected with described rectification filtering unit DC terminal, and the other end is connected with described hybrid energy-storing unit.
8. low voltage electromagnetic switch energy cyclic control system according to claim 7, it is characterized in that, when described sampling unit judges that described rectification filtering unit DC terminal voltage exceedes upper limit secure threshold voltage, described two-way DC/DC changer starts, and working in decompression mode, described hybrid energy-storing unit is charged by described rectification filtering unit DC terminal voltage through decompression transformation；Real-time controlling unit in described control module exports the first voltage reference value through a D/A converting circuit, and this first voltage reference value forms the first outer voltage in conjunction with the voltage feedback value of described two-way DC/DC changer with the output of described hybrid energy-storing unit junction after error is amplified；This first outer voltage provides one first current reference value after one first compensation loop, and compares with the feedback current in described hybrid energy-storing unit charging process, forms the first current inner loop；This first current inner loop outputs control signals to one second driver element, and by described two-way DC/DC changer, the voltage and current of output to described hybrid energy-storing unit is carried out dynamic stability adjustment, until described rectification filtering unit DC terminal voltage is lower than described upper limit secure threshold voltage, close described two-way DC/DC changer.
9. low voltage electromagnetic switch energy cyclic control system according to claim 7, it is characterized in that, when described sampling unit judges described rectification filtering unit DC terminal voltage lower than lower limit secure threshold voltage, described two-way DC/DC changer starts, and working in boost mode, described rectification filtering unit DC terminal is discharged by described hybrid energy-storing unit through boosting inverter；Real-time controlling unit in described control module exports the second voltage reference value through a D/A converting circuit, and this second voltage reference value forms the second outer voltage after the voltage feedback value in conjunction with described two-way DC/DC changer and the output of described rectification filtering unit DC terminal junction；This second outer voltage provides one second current reference value after one second compensation loop, and compares with the feedback current in described hybrid energy-storing cell discharge process, forms the second current inner loop；This second current inner loop outputs control signals to one second driver element, and by described two-way DC/DC changer, output to described rectification filtering unit DC terminal voltage is carried out dynamic stability adjustment.
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