CN102426984A - High-frequency control system for electricity interference resisting intelligent alternating current contactor - Google Patents
High-frequency control system for electricity interference resisting intelligent alternating current contactor Download PDFInfo
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- CN102426984A CN102426984A CN2011103857836A CN201110385783A CN102426984A CN 102426984 A CN102426984 A CN 102426984A CN 2011103857836 A CN2011103857836 A CN 2011103857836A CN 201110385783 A CN201110385783 A CN 201110385783A CN 102426984 A CN102426984 A CN 102426984A
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Abstract
The invention relates to a high-frequency control system for an electricity interference resisting intelligent alternating current contactor. According to the high-frequency control system, a PWM (Pulse Width Modulation) control system subjected to closed loop control of a double-current loop is applied to the control over of the electricity interference resisting intelligent alternating current contactor; the high-frequency control system comprises a direct current power supply, an energy storage circuit, a power electronic module, a fault detection circuit, a PWM isolation driving module, a follow current protection circuit, a contactor coil, a voltage sampling circuit, a current detection circuit, a human-machine interaction module, a microprocessor, a multi-channel simulation switch, two signal conditioning modules, two program-controllable amplifying modules and two PWM control circuits. According to the high-frequency control system, the full-process dynamic optimizing control over the electricity interference resisting intelligent alternating current contactor is realized by adjusting two current closed loops at high frequency and high efficiency.
Description
Technical field
The present invention relates to the apparatus field of intelligent control, particularly anti-flashover intelligent AC contactor high frequency control system.
Background technology
Electromagnetic AC contactor is as a kind of traditional low-pressure electronic equipment product, and its performance index directly have influence on the safety and stablization of whole using electricity system and control system.Along with deepening constantly of environmental protection, energy-saving and emission-reduction theory, traditional electrical equipment and electrical industry is had higher requirement.Electric voltage dropping---rolling electric fault is present comparatively common a kind of fault, and is very harmful to system, especially those oil, chemical industry, metallurgy etc. needed the enterprise of operation continuously, endangers bigger.At present, the research of anti-flashover intelligent product and contactor control resist technology has obtained paying attention to widely.High frequency control technology, switch power technology, power electronic technology, error protection technology etc. are introduced low-voltage electrical apparatus control field; Can change the operational mode of anti-flashover intelligent AC contactor; Realize comprehensive raising of its performance index, lay the foundation for developing brand-new renewal product.
Anti-flashover intelligent AC contactor also must have the anti-rolling electric protection function when the rolling electrification takes place except that the function with the optimal control of intelligent AC contactor overall process, this is for jumbo A.C. contactor control particularly difficulty.
Most of electromagnetic AC contactor all belongs to the mode of operation of voltage fed.In this pattern; Because the variation of working gas gap; Make in whole motion process parameter such as AC inductance change, parameters such as the voltage in dynamic process in its system, electric current, magnetic flux, magnetic linkage, displacement, speed, suction all change in time, cause the control difficult point.Magnetic state with open position after mechanism's closure differs greatly, and adopts the control model that changes voltage mostly in the past, as: the control method of " high voltage starting, low-voltage maintenance ".This control can't be controlled the excitatory magnetic potential in the magnetic circuit effectively, in real time, can only realize that in starting process segmentation changes control voltage, and different electromagnetic mechanisms is needed the Different control program, is difficult to realize optimal control.Moreover when contactor is in the close position, if supply voltage fluctuates, the magnetic potential in the magnetic circuit will change, and low-voltage keeps and will be affected.
Electromagnetic AC contactor for traditional AC excitation; AC electromagnetic mechanism has that the ferromagnetic material loss is big, divided magnetic ring easy fracture, AC noise in service are big, starting process receives shortcomings such as the adhesive phase angle influences, the incompatible development of intelligent control at present.
Summary of the invention
The objective of the invention is to invent a kind of anti-flashover intelligent AC contactor high frequency control module,, realize anti-flashover intelligent AC contactor overall process optimal control in dynamic through two current closed-loops of adjusting of high frequency efficient.
The present invention adopts following scheme to realize: a kind of anti-flashover intelligent AC contactor high frequency control system; Comprise DC power supply, contactor coil and be provided with the microprocessor of human-computer interaction module; It is characterized in that: described DC power supply is connected with an electric power electronic module through an accumulator; Described electric power electronic module carries out high frequency chopping to the direct voltage of input, delivers to said contactor coil two ends; Said contactor coil is provided with current detection circuit, voltage detecting circuit and afterflow protective circuit; Described voltage detecting circuit is gathered the voltage signal of contactor coil, sends into one first program control amplifier module through the first signal condition module; The output of the described first program control amplifier module is connected with a multichannel analog switch through one first pwm control circuit; Described current detection circuit is measured the current value of contactor coil, sends into one second program control amplifier module through a secondary signal conditioning module, and the output of the described second program control amplifier module is connected with said multichannel analog switch through second pwm control circuit; Described microprocessor connects respectively at the described first program control amplifier module, the second program control amplifier module and multichannel analog switch; The output of described multichannel analog switch is connected with described electric power electronic module through a PWM isolated drive circuit; Described PWM isolated drive circuit also is connected with the failure detector circuit that is used for detection system overvoltage, overcurrent or short trouble signal.
Compare with present anti-flashover intelligent AC contactor, the present invention has following advantage:
(1) adopted electronic power switch as master element, the position of master switch is placed on the high-pressure side of control module, has realized high frequency chopping, by the mode of operation of all current limlitings.Need not connect power electronic device and just can directly gather current signal, further improve the rapidity and the stability of control.And the overvoltage on the power electronic device reduces significantly, and system reliability further improves.
(2) have two PWM control system; Realize the starting process and the control transformation in sticking stage through modular converter, starting process and maintenance process all adopt the high speed current sense comparator, have accelerated Whole Response speed; Improve the Current Control precision, reduced the ripple coefficient of holding current.
(3) in control system, added fault detection module and PWM isolation drive module, when detecting overvoltage, overcurrent or short-circuit signal, can trigger the relevant hardware circuit and block PWM output, turn-offed electronic power switch, defencive function is further strengthened.
(4) if adopt the control mode of Voltage loop, because AC electromagnetic mechanism has been fed the dc magnetizing power supply, the reactance in the magnetic reactance in its magnetic circuit (magnetic hysteresis, eddy current loss cause), the circuit will be greatly, even disappear, and the electric current in the coil will increase considerably.In control procedure, the switching tube of start loop will bear great rush of current, and especially to jumbo contactor (as: 630A and above A.C. contactor), control is difficulty very.And the control model of the two closed loops of the high-frequency current that the present invention adopts, this problem will be readily solved, and the scope of application further enlarges.
Description of drawings
Fig. 1 is the system principle configuration diagram of the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of anti-flashover intelligent AC contactor high frequency control system; Comprise DC power supply, contactor coil and be provided with the microprocessor of human-computer interaction module; It is characterized in that: described DC power supply is connected with an electric power electronic module through an accumulator; Described electric power electronic module carries out high frequency chopping to the direct voltage of input, delivers to said contactor coil two ends; Said contactor coil is provided with current detection circuit, voltage detecting circuit and afterflow protective circuit; Described voltage detecting circuit is gathered the voltage signal of contactor coil, sends into one first program control amplifier module through one first signal condition module; The output of the described first program control amplifier module is connected with a multichannel analog switch through first pwm control circuit; Described current detection circuit is measured the current value of contactor coil, sends into one second program control amplifier module through a secondary signal conditioning module, and the output of the described second program control amplifier module is connected with said multichannel analog switch through second pwm control circuit; Described microprocessor connects respectively at the described first program control amplifier module, the second program control amplifier module and multichannel analog switch; The output of described multichannel analog switch is connected with described electric power electronic module through a PWM isolated drive circuit; Described PWM isolated drive circuit also is connected with the failure detector circuit that is used for detection system overvoltage, overcurrent or short trouble signal.Described human-computer interaction module is a touch display screen.Described DC power supply is to be made up of ac/dc power supply, current rectifying and wave filtering circuit and protective circuit cascade successively.
Please continue with reference to Fig. 1, Fig. 1 is the system principle configuration diagram of the embodiment of the invention.When system powered on, micro controller system W at first got into self-check program, if module is undesired, sent alarm signal, simultaneously, cut off the control power supply.If module is normal, micro controller system W detects the level state that electronic circuit is set, and according to different level states, can get into the parameter setting program or load and last time parameter is set and directly moves.If be positioned at parameter state be set, through parameter setting and display module S (being human-computer interaction module), the starting current time-domain curve of device for switching can be set, holding current value and anti-rolling electricity time-delay break-time, and storage and demonstration are provided with parameter.System of the present invention has the disjunction measuring ability can distinguish rolling electricity and outage, and if the disjunction if the rolling electricity is then delayed time is then disjunction at once of normal power down.In the present embodiment, described microprocessor also is connected with communication module, and system also can accept the Long-distance Control of host computer through this communication module.
During running status; System voltage sample circuit V circulating sampling system voltage; If magnitude of voltage is within set adhesive threshold value; Microcontroller W starts the first signal condition module I 1 and secondary signal conditioning module I2 respectively; The signal of the first signal condition module I 1 is directly taken from voltage sampling circuit V; The signal of secondary signal conditioning module I2 obtains through current detection circuit E, sends into the first program control amplifier module K1 and the second program control amplifier module K2 respectively through the signal of signal condition resume module, and the signal of the first program control amplifier module K1 and the second program control amplifier module K2 is sent into the first pwm control circuit C1 and the second pwm control circuit C2 respectively; Microprocessor W is provided with different yield values through the first program control amplifier module K1 with the second program control amplifier module K2, and the operation through multichannel analog switch D control contactor is in adhesive stage or sticking stage.External power source is sent into contactor coil R through power module P, rectification filtering module Z, protective circuit B, accumulator C through the electronic power switch modules A, makes the contactor starting.AC power becomes DC power supply through rectification filtering module Z, and the electronic power switch modules A is carried out high frequency chopping to direct voltage, delivers to contactor coil R two ends, and the contactor coil electric current begins rising and produces field ampere-turns.Voltage sampling circuit V, the first signal condition module I, 1, the first program control amplifier module K1, a PWM control system C1, multichannel analog switch D, PWM isolation drive module G, electronic power switch modules A, contactor coil R constitute the starting closed loop, and the contactor starting current is carried out accurate closed-loop control.
The starting process of contactor is following: voltage sampling circuit V circulating sampling supply voltage; When being positioned within the adhesive threshold value of setting, microprocessor starts the first pwm control circuit C1, and the driving electric electronic switch carries out copped wave control to main circuit; Contactor begins starting; The voltage signal that voltage sampling circuit V is gathered is sent into the first program control amplifier module K1 through the first signal condition module I 1, the gain control instruction that the first program control amplifier module I 1 is sent according to microprocessor W; Input signal is handled; Voltage signal after the gain is linked in the current sense comparator in the pwm control circuit C1 and compares with reference value, for PWM output provides criterion, through regulating duty ratio and the turn-on cycle number of output PWM; After electric current is adjusted to the microprocessor system set point rapidly, with certain clock frequency electric current carried out dynamic compensation and make electric current keep dynamically constant; The starting process of contactor can be divided into a plurality of time periods; Single-chip microcomputer can write different current value gain command in the different time section; Current values different in the starting process is linked up, become the time-domain curve of starting current, according to different contactors; Different starting current curves is set, realizes the optimal control of contactor starting process.
Current detection circuit E, secondary signal conditioning module I2, the second program control amplifier module K2, the second pwm control circuit C2, multichannel analog switch D, PWM isolation drive module G, electronic power switch modules A, contactor coil R constitute the maintenance closed loop; Current detection circuit E measures the current value in the contactor coil; Send into the second program control amplifier module K2 through secondary signal conditioning module I2; The gain control instruction of sending according to microprocessor W after the input signal processing and amplifying, is delivered to signal in the second pwm control circuit C2 and to be compared; For PWM output provides criterion; Through regulating duty ratio and the turn-on cycle number of output PWM, electric current is adjusted to the microprocessor system set point rapidly, with certain clock frequency electric current is carried out quick dynamic compensation and make electric current keep dynamically constant; According to the contactor of different capabilities, microprocessor W can write different current value gain command to the second program control amplifier module I 2, thereby the steady state value of control holding current makes this control module have broad applicability.
In system's running, when voltage sampling circuit detected supply voltage and is positioned at the disjunction threshold value of setting, microprocessor W was judged as normal disjunction and still shakes electric fault, thereby carries out corresponding disjunction control subprogram.Directly disjunction, microprocessor W then controls PWM control module isolation drive module G, and quick closedown PWM output makes the rapid disjunction of contactor.The rolling electric fault, microprocessor system W starting accumulator C according to the delay time of setting, resists the time-delay of rolling electricity.
In addition, when in a single day failure detector circuit Q detects fault-signals such as overvoltage, overcurrent or short circuit are arranged in the circuit among the figure, can block PWM output rapidly, close electronic power switch A.Afterflow protective circuit X prevents that the overvoltage that contactor coil produces is provided with in course of action.Parameter setting and display module S can show and be provided with parameters such as current threshold, operation voltage, the rolling electricity delay time of contactor.
The above is merely preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (4)
1. anti-flashover intelligent AC contactor high frequency control system; Comprise DC power supply, contactor coil and be provided with the microprocessor of human-computer interaction module; It is characterized in that: described DC power supply is connected with an electric power electronic module through an accumulator; Described electric power electronic module carries out high frequency chopping to the direct voltage of input, delivers to said contactor coil two ends; Said contactor coil is provided with current detection circuit, voltage detecting circuit and afterflow protective circuit; Described voltage detecting circuit is gathered the voltage signal of contactor coil, sends into one first program control amplifier module through one first signal condition module; The output of the described first program control amplifier module is connected with a multichannel analog switch through one first pwm control circuit; Described current detection circuit is measured the current value of contactor coil, sends into one second program control amplifier module through a secondary signal conditioning module, and the output of the described second program control amplifier module is connected with said multichannel analog switch through second pwm control circuit; Described microprocessor connects respectively at the described first program control amplifier module, the second program control amplifier module and multichannel analog switch; The output of described multichannel analog switch is connected with described electric power electronic module through a PWM isolated drive circuit; Described PWM isolated drive circuit also is connected with the failure detector circuit that is used for detection system overvoltage, overcurrent or short trouble signal.
2. anti-flashover intelligent AC contactor high frequency control system according to claim 1 is characterized in that: described human-computer interaction module is a touch display screen.
3. anti-flashover intelligent AC contactor high frequency control system according to claim 1 is characterized in that: described DC power supply is to be made up of ac/dc power supply, current rectifying and wave filtering circuit and protective circuit cascade successively.
4. anti-flashover intelligent AC contactor high frequency control system according to claim 1, it is characterized in that: described microprocessor is connected with communication module, realizes and the upper PC communication of far-end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103857836A CN102426984B (en) | 2011-11-29 | 2011-11-29 | High-frequency control system for electricity interference resisting intelligent alternating current contactor |
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| CN2011103857836A CN102426984B (en) | 2011-11-29 | 2011-11-29 | High-frequency control system for electricity interference resisting intelligent alternating current contactor |
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| CN102426984A true CN102426984A (en) | 2012-04-25 |
| CN102426984B CN102426984B (en) | 2013-12-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109144159A (en) * | 2018-09-14 | 2019-01-04 | 江苏国网自控科技股份有限公司 | A kind of single-phase rolling electrical analogue generating device and its control method based on self-contained power voltage regulator controllers |
| CN112366104A (en) * | 2016-03-01 | 2021-02-12 | 原子动力公司 | Hybrid air gap and solid state circuit breaker |
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| US4978865A (en) * | 1988-07-20 | 1990-12-18 | Vdo Adolf Schindling Ag | Circuit for regulating a pulsating current |
| DE29909901U1 (en) * | 1999-06-08 | 1999-09-30 | Moeller Gmbh | Electronic drive control for a contactor drive |
| CN101127282A (en) * | 2007-06-08 | 2008-02-20 | 西安交通大学 | Intelligent AC contactor control unit based on current-variable control |
| US20090052107A1 (en) * | 2007-08-24 | 2009-02-26 | Maclennan David Scott S | Automatically configuring vacuum contactor |
| CN101477919A (en) * | 2009-01-23 | 2009-07-08 | 东南大学 | Intelligent control module for permanent magnet contactor |
| CN201348976Y (en) * | 2009-01-22 | 2009-11-18 | 厦门士林电机有限公司 | Drive circuit for coil of contactor |
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2011
- 2011-11-29 CN CN2011103857836A patent/CN102426984B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4978865A (en) * | 1988-07-20 | 1990-12-18 | Vdo Adolf Schindling Ag | Circuit for regulating a pulsating current |
| DE29909901U1 (en) * | 1999-06-08 | 1999-09-30 | Moeller Gmbh | Electronic drive control for a contactor drive |
| CN101127282A (en) * | 2007-06-08 | 2008-02-20 | 西安交通大学 | Intelligent AC contactor control unit based on current-variable control |
| US20090052107A1 (en) * | 2007-08-24 | 2009-02-26 | Maclennan David Scott S | Automatically configuring vacuum contactor |
| CN201348976Y (en) * | 2009-01-22 | 2009-11-18 | 厦门士林电机有限公司 | Drive circuit for coil of contactor |
| CN101477919A (en) * | 2009-01-23 | 2009-07-08 | 东南大学 | Intelligent control module for permanent magnet contactor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112366104A (en) * | 2016-03-01 | 2021-02-12 | 原子动力公司 | Hybrid air gap and solid state circuit breaker |
| CN109144159A (en) * | 2018-09-14 | 2019-01-04 | 江苏国网自控科技股份有限公司 | A kind of single-phase rolling electrical analogue generating device and its control method based on self-contained power voltage regulator controllers |
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