CN103456566B - Digitlization overall process Dynamic controlling intelligent AC contactor - Google Patents
Digitlization overall process Dynamic controlling intelligent AC contactor Download PDFInfo
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Abstract
The present invention relates to field of intelligent control over equipment, particularly a kind of digitlization overall process Dynamic controlling intelligent AC contactor.By adopting digitized chip to achieve A.C. contactor attracting process velocity close-loop control (based on coil current trailing edge slope), directly controlling the Impact energy of sound iron core and dynamic/static contact, significantly can reduce the iron core in attracting process and contact bounce; Holding course works in current closed-loop chopping mode, automatically adjusts chopping frequency, prevents audio-frequency noise, can maintain the stable of holding current simultaneously, carry out energy-saving, noiseless operation with closed ring in wider input voltage range; Direct current negative pressure after rectifying and wave-filtering is applied to coil two ends by breaking course, coil current is forced to decline fast, electromagnetic system demagnetizes fast, contact a certain moment disjunction before zero rapidly, and there is the self-correcting function of Zero current disjunction, the zero-current-break control failure that the factors such as the dispersed and contact abrasion of the action of contactor cause can be overcome.
Description
Technical field
The present invention relates to field of intelligent control over equipment, particularly a kind of digitlization overall process Dynamic controlling intelligent AC contactor.
Background technology
Rapidly, there is various control scheme in the intelligentized control method development of A.C. contactor in recent years.The early stage opened loop control scheme mostly adopting the starting of A.C. contactor high-voltage direct-current, low-voltage direct-current maintenance, be that the control module of core combines with improved A.C. contactor body by single-chip microcomputer, the selectivity Discrete control and the energy-saving, noiseless in sticking stage that realize starting process run.But due to A.C. contactor body construction, action dispersiveness unshakable in one's determination and coil is very large in the course of the work, even if the increase to same contactor work times, operating value also will change, and bring certain difficulty to Based Intelligent Control.Along with the development of electronic technology and control technology, the A.C. contactor pulse width modulation controlled scheme of band FEEDBACK CONTROL is paid close attention to.Document [1-2] proposes a kind of contactor pulse-width modulation intelligent control scheme of feedback with voltage, and the dynamic duty process of contactor and the heat condition of magnetic system are analyzed, document [3] adopts pulse modulation technology to control permanent magnet contactor starting process, achieve the permanent magnet contactor optimal control of position-sensor-free, but in its starting process, electric parameter is opened loop control.The reactance voltage that document [4] have studied low capacity A.C. contactor falls opened loop control scheme, comprises the design of control module breaker in middle power supply and the realization of failure protection function.Document [5] proposes the A.C. contactor intelligent control scheme that a kind of closed loop copped wave is started, can the exciting curent of flexible contactor.All using single-chip microcomputer as kernel control chip in above control program, the whole service process of contactor is controlled, coordinate outside analog power control chip or switching circuit, the closed loop of the excitatory state of tentaculum that indirectly achieves a butt joint or opened loop control, the performance of contactor is made to obtain certain lifting, but required device is more, the direct control of the excitatory state of tentaculum that do not achieve a butt joint by single control chip, be difficult to incorporate complicated control strategy efficiently in control procedure, constrain effective control of contactor.
List of references
[1] Liu Yingyi, Chen Degui, the knob spring duckweed, etc. the intelligent contactor dynamic characteristic of feedback with voltage and the emulation of contact bounce and research [J]. Proceedings of the CSEE, 2007,27 (30): 20-25.
[2] Ji Liang, Chen Degui, Liu Yingyi, etc. the thermal model [J] of feedback intelligent contactor with voltage. XI AN JIAOTONG UNIVERSITY Subject Index, 2010,44 (8): 90-95.
[3] Wang Xianbing, Lin Heyun, Fang Shuhua, etc. the intelligent permanent magnet contactor weak magnetics detect of position-sensor-free and combined floodgate dynamic analysis [J]. Proceedings of the CSEE, 2011,31 (18): 93-99.
[4] Tang Longfei, Xu Zhihong. A.C. contactor novel intelligent reactance voltage falls the design [J] of control module. Proceedings of the CSEE, 2012,32 (27): 95-103.
[5] Tang Longfei, Xu Zhihong. A.C. contactor control module design [J] is started in closed loop copped wave. Proceedings of the CSEE .2013,33 (18): 132-139.
Summary of the invention
The object of the invention is to invent a kind of digitlization overall process Dynamic controlling intelligent AC contactor.By adopting digitized chip to achieve A.C. contactor attracting process velocity close-loop control (based on coil current trailing edge slope), directly controlling the Impact energy of sound iron core and dynamic/static contact, significantly can reduce the iron core in attracting process and contact bounce; Holding course works in current closed-loop chopping mode, automatically adjusts chopping frequency, prevents audio-frequency noise, can maintain the stable of holding current simultaneously, carry out energy-saving, noiseless operation with closed ring in wider input voltage range; Direct current negative pressure after rectifying and wave-filtering is applied to coil two ends by breaking course, coil current is forced to decline fast, electromagnetic system demagnetizes fast, contact a certain moment disjunction before zero rapidly, and there is the self-correcting function of Zero current disjunction, the zero-current-break control failure that the factors such as the dispersed and contact abrasion of the action of contactor cause can be overcome.
The present invention adopts following scheme to realize: a kind of digitlization overall process Dynamic controlling intelligent AC contactor, comprise an AC power P, it is characterized in that: also comprise a digital control unit M, described AC power P becomes direct current after rectification module A and filter capacitor D, and the output of this direct current is connected with the first end of one end of resistance R1, the first electronic power switch S1 and one end of the first fast recovery diode D2; The earth terminal of this direct current is connected with one end of one end of resistance R2, the second fast recovery diode D3 and second end of the second electronic power switch S4; The other end of described resistance R1 is connected with the other end of resistance R2; Second end of described first electronic power switch S1, second end of the second fast recovery diode D3 are connected with one end of contactor coil C; The other end of described first fast recovery diode D2 is connected with the first end of the second electronic power switch S4; Described digital control unit M is connected with and isolates sample circuit U, for gathering current sensor I, the first isolated drive circuit Q1 and the second isolated drive circuit Q2 of contactor coil electric current for described A.C. contactor break-time self-tuning self-correcting circuit Z, contact current detection circuit K, man-machine interface circuit W, pumping voltage.
In an embodiment of the present invention, operating state according to described first electronic power switch S1, the second electronic power switch S4 can define three kinds of circuit states: when the first electronic power switch S1, the second electronic power switch S4 conducting simultaneously, direct current forward voltage is applied to coil two ends, and defining now circuit state is+1 state; First electronic power switch S1, the second electronic power switch S4 end simultaneously and coil current is non-vanishing time, coil current is by first and second fast recovery diode D2, D3 afterflow, by energy feedback to filter capacitor D, contactor coil C bears direct current negative voltage in two ends, and defining now circuit state is-1 state; First electronic power switch S1, the second electronic power switch S4 only have a conducting and coil current is non-vanishing time, coil is by one of them switching tube and a fast recovery diode afterflow, contactor coil terminal voltage is negative continued flow tube pressure drop, and defining now circuit state is 0 state.
In an embodiment of the present invention, the course of work of described A.C. contactor comprises three phases:
The adhesive stage: after receiving adhesive control command; digital control unit M starts to control A.C. contactor closed loop and starts; PWM control mode selects ON/OFF control model, and ON/OFF control model is by being divided into multistage to control the timer in digital control unit M, and each section has a fiducial value; when sampled value is greater than fiducial value; output duty cycle is the pwm signal of 0%, on-off switching tube, if sampled value is less than fiducial value; then output duty cycle is the pwm signal of 100%, realizes high-speed switch and controls;
In the sticking stage: after attracting process terminates, A.C. contactor proceeds to sticking control program, now, by setting PWM operating frequency and duty ratio, circuit is switched fast between+1 state and-1 state, thus keeping coil electric current is dynamically constant;
The disjunction stage: utilize the High Speed Analog comparator in digital control unit M to carry out hardware and to walk abreast zero-detection, detection contact current zero-crossing point, when receiving disjunction instruction, digital control unit M performs disjunction instruction after carrying out the time delay of a period of time from a upper current zero-crossing point, fast circuit is set to-1 state, coil current quickly falls to 0, ensures the zero forefoot area quick disjunction of contact in setting, reduces breaking arc.
In an embodiment of the present invention, the described sticking stage has speed closed loop and current closed-loop two close cycles mode of operation, controls current inner loop with speed outer shroud; The execution frequency of a setting current inner loop, compared with set-point by the high-speed AD sampling coil current value of digital control unit (M), when being greater than set-point, duty ratio is updated to 0%, when being less than set-point, duty ratio is updated to 100%, current inner loop fast by current value adjustment to set-point; Speed outer shroud magnetic test coil electric current trailing edge slope, in starting process, when circuit is in-1 state, coil-end voltage is negative, and this negative pressure can force coil current to decline fast, coordinates the electric current under+1 state to rise fast, improves the governing speed of electric current;
In an embodiment of the present invention, described digital control unit M have employed PWM pin and rewrites function, in starting process, artificial rewriting PWM pin state, the trailing edge slope that the trailing edge slope that-1 state is caused and motion back-emf cause is peeled off mutually, exits pin fast and rewrite, by PWM module again adapter pin state after digital control unit M completes slope detection, for by coil current quick adjustment to set-point, accomplish that slope detection and Current Control fast crosstalk are carried out; In starting process, optimizing contactor starting process by controlling dynamic speed unshakable in one's determination, reducing contact bounce.
In an embodiment of the present invention, described Self-correc ting control circuit Z is containing control button and test circuit, before AC contactor main contact energising, press control button, carry out intrinsic disjunction test operate time, be recorded in chip, as the correction parameter of Zero current disjunction, effectively prevent the dispersiveness of contactor action.Contactor, after working long hours, due to reasons such as the aging and contact abrasions of mechanism, changes, can carry out off-line calibration, guarantee the zero-current-break control of contactor, improve the reliability of control operate time.
The appearance of digital signal controller, makes data processing speed and precision obtain larger lifting; Peripheral circuit is integrated, and simplify hardware designs, have more cost advantage, wiring is simple, and electromagnetic interference is relatively little, reliable and stable; Switching tube loss under digital control is little, and efficiency is high; Adopt digital signal processor to control A.C. contactor, can realize the process control of various complexity, good operation stability, flexibility is high, versatility good.
The present invention devises a kind of A.C. contactor digitlization overall process dynamic control scheme, digitized chip is adopted to achieve A.C. contactor attracting process velocity close-loop control (based on coil current trailing edge slope), the Impact energy of direct control sound iron core and dynamic/static contact, significantly can reduce the iron core in attracting process and contact bounce; Holding course works in current closed-loop chopping mode, automatically adjusts chopping frequency, prevents audio-frequency noise, can maintain the stable of holding current simultaneously, carry out energy-saving, noiseless operation with closed ring in wider input voltage range; Direct current negative pressure after rectifying and wave-filtering is applied to coil two ends by breaking course, coil current is forced to decline fast, electromagnetic system demagnetizes fast, contact a certain moment disjunction before zero rapidly, and there is the self-correcting function of Zero current disjunction, the zero-current-break control failure that the factors such as the dispersed and contact abrasion of the action of contactor cause can be overcome.
Compared with the intelligent control scheme of current A.C. contactor, this problem tool has the following advantages:
(1) digit chip is introduced in the Based Intelligent Control of A.C. contactor.The functions such as the detection at zero point of sucting speed ring, holding current ring and breaking course, all can adopt software programming to complete, achieve the software control flexibly of the excitatory state of magnetic circuit, be convenient to incorporate Intelligent Control Strategy in programming; Use digital control after dynamically can change circuit structure, only circuit just can be made to change between+1 state ,-1 state, 0 state by software control; Contactor coil is high frequency pumping, can there is spike interference in switching tube conducting and shutdown moment, adopt digital control after can avoid spike and sample, accurate magnetic test coil electric current and contact zero crossing; Repeated detection can calculate average current when calculating current slope, then use average current slope calculations, slope is calculated more accurate; These are all that analogue system and single-chip computer control system cannot be accomplished.
(2) main circuit have employed brand-new topological structure.Two switching tubes are adopted to coordinate two fast recovery diodes can apply positive or negative driving voltage at coil two ends easily, accelerate the governing speed of coil current, turn avoid coil current when applying negative pressure reverse simultaneously, prevent the phenomenon occurring heavily adhesive in disjunction controls, by the flexible control of switch tube conducting state, circuit can be made to change flexibly between+1 state ,-1 state, 0 state, facilitate contactor attracting process velocity close-loop control and disjunction control fast.
(3) attracting process speed closed loop, slope detection control.In attracting process, adopt velocity close-loop control can the speed dynamic unshakable in one's determination of direct control contactor, and then directly control the stroke speed of dynamic/static contact and the stroke speed of sound iron core, inherently reduce contact bounce; Velocity close-loop control can avoid speed unshakable in one's determination in contactor starting process to be the situation of 0 in addition, ensures the reliable adhesive of contactor; Contactor moves speed unshakable in one's determination to adopt slope detection indirectly to reflect, thus carry out the contactor velocity close-loop control of Speedless sensor, (in circuit breaker general presence bit displacement sensor) cost is low compared with the scheme of speed sensor, there is not installation question, it also avoid the problem in useful life of transducer, a kind of desirable control program of can yet be regarded as simultaneously.
(4) there is self-correcting function.In breaking course, add self-correcting off-line calibration function, before AC contactor main contact energising, carry out intrinsic disjunction test operate time, be recorded in chip, as the correction parameter of Zero current disjunction, effectively prevent the dispersiveness of contactor action.After contactor works long hours, the calibration of operate time can also be carried out, effectively improve the reliability of zero-current-break control, improve the contactor life-span.Meanwhile, the negative pressure that coil two ends are born, accelerates the decrease speed of coil current and the breaking speed of contact, reduces the impact of the dispersiveness of contactor action, improves the accurate control of breaking course.
Accompanying drawing explanation
Fig. 1 is digitlization self-correcting overall process Dynamic controlling theory diagram.
In figure, P is AC power, and A is rectification module, and D is filter capacitor, R1, R2 are divider resistance, and S1 is the first electronic power switch, and S4 is the second electronic power switch, D2, D3 are first and second fast recovery diode, and C is contactor coil, and I is current sensor, W is man-machine interface circuit, and U is pumping voltage isolation sample circuit, and M is digital control unit, Z is Self-correc ting control circuit, K is probe of contactor current detection circuit, and Q1 is the first isolated drive circuit, and Q2 is the second isolated drive circuit.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
Refer to Fig. 1, the present embodiment provides a kind of digitlization overall process Dynamic controlling intelligent AC contactor, comprise an AC power P, it is characterized in that: also comprise a digital control unit M, described AC power P becomes direct current after rectification module A and filter capacitor D, and the output of this direct current is connected with the first end of one end of resistance R1, the first electronic power switch S1 and one end of the first fast recovery diode D2; The earth terminal of this direct current is connected with one end of one end of resistance R2, the second fast recovery diode D3 and second end of the second electronic power switch S4; The other end of described resistance R1 is connected with the other end of resistance R2; Second end of described first electronic power switch S1, second end of the second fast recovery diode D3 are connected with one end of contactor coil C; The other end of described first fast recovery diode D2 is connected with the first end of the second electronic power switch S4; Described digital control unit M is connected with and isolates sample circuit U, for gathering current sensor I, the first isolated drive circuit Q1 and the second isolated drive circuit Q2 of contactor coil electric current for described A.C. contactor break-time self-tuning self-correcting circuit Z, contact current detection circuit K, man-machine interface circuit W, pumping voltage.
Concrete, AC power P, after rectification module A and filter capacitor D, becomes stable direct current; S1, S4 are electronic power switch, can control its conducting or cut-off, D2, D3 are fast recovery diode, can define 3 kinds of circuit states according to the state of S1, S4 two switching tubes: during S1, S4 conducting simultaneously, direct current forward voltage is applied to coil two ends, and defining now circuit state is+1 state; S1, S4 end simultaneously and coil current is non-vanishing time, coil current is by diode D2, D3 afterflow, and by energy feedback to filter capacitor, direct current negative voltage is born at coil two ends, and defining now circuit state is-1 state; S1, S4 only have a conducting and coil current is non-vanishing time, coil is by a switching tube and a fly-wheel diode afterflow (being assumed to be S4, D3), and coil-end voltage is negative continued flow tube pressure drop, and amplitude is less, and defining now circuit state is 0 state.Hall current sensor I is for detecting contactor coil electric current; Man-machine interface circuit W is used for the on off control of system, the on-line operation of module or self-correcting condition selecting and running status display; Resistance R1, R2 and pumping voltage isolation sample circuit U are used for the pumping voltage of detection filter electric capacity; Isolated drive circuit Q1 and isolated drive circuit Q2 is respectively used to driving switch pipe S1, S4; Contact current detection circuit K is for detecting the current value of main noddle on contactor; Self-correcting circuit Z is used for the self-correcting of contactor break-time; The core of whole control system is numerical control system M, carries out the starting of the stage speed closed loop of adhesive flexibly, the silent running of sticking stage energy-saving, breaking course zero-current-break control according to coil current value and contact current value.
The course of work is as follows:
1, the adhesive stage: after receiving adhesive control command, numerical control system M starts to control A.C. contactor closed loop and starts, PWM control mode selects ON/OFF control model, and ON/OFF control model is by being divided into multistage to control the timer in chip, and each section has a fiducial value, when sampled value is greater than fiducial value, output duty cycle is the pwm signal of 0%, on-off switching tube, if sampled value is less than fiducial value, then output duty cycle is the pwm signal of 100%, realizes high-speed switch and controls.The sticking stage has speed closed loop and current closed-loop two close cycles mode of operation, controls current inner loop with speed outer shroud, the execution frequency of a setting current inner loop, compared with set-point by the high-speed AD sampling coil current value of digital control system, when being greater than set-point, duty ratio is updated to 0%, and when being less than set-point, duty ratio is updated to 100%, current inner loop fast by current value adjustment to set-point, speed outer shroud magnetic test coil electric current trailing edge slope, in starting process, when circuit is in-1 state, coil-end voltage is negative, this negative pressure can force coil current to decline fast, the electric current under+1 state is coordinated to rise fast, improve the governing speed of electric current, the fast dynamic response of electric current makes velocity close-loop control unshakable in one's determination become possibility, in the electric current trailing edge slope that motion back-emf causes but the electric current trailing edge slope that-1 state causes is added to simultaneously, velocity close-loop control is made to become difficulty, present invention employs PWM pin and rewrite function, in starting process, artificial rewriting PWM pin state, the trailing edge slope that the trailing edge slope that-1 state is caused and motion back-emf cause is peeled off mutually, after chip completes slope detection, exit pin fast rewrite, by PWM module again adapter pin state, for by coil current quick adjustment to set-point, accomplish that slope detection and Current Control fast crosstalk are carried out, in starting process, optimize contactor starting process by controlling dynamic speed unshakable in one's determination, reduce contact bounce, this is a kind of control thinking completely newly, only have employed digit chip and just may complete.
2, the sticking stage: after attracting process terminates, contactor proceeds to sticking control program, now, by setting PWM operating frequency and duty ratio, circuit is switched fast between+1 state and-1 state, thus keeping coil electric current is dynamically constant, the coil current of contactor is maintained a lower numerical value, can chopping frequency be ensured again simultaneously, avoid Electromagnetic System of Contactor and produce audio-frequency noise.
3, the disjunction stage: utilize the High Speed Analog comparator in numerical control system M to carry out hardware and to walk abreast zero-detection, detection contact current zero-crossing point, when receiving disjunction instruction, system performs disjunction instruction after carrying out the time delay of a period of time from a upper current zero-crossing point, fast circuit is set to-1 state, coil current quickly falls to 0, ensures the zero forefoot area quick disjunction of contact in setting, reduces breaking arc.
In breaking course, negative pressure accelerates the decrease speed of electric current and the breaking speed of contact, reduce dispersed impact, can accurately control breaking current phase place, accomplish the quick disjunction in a certain specific region before the zero point of main circuit current, significantly reduce the energy of breaking arc, improve the electric life of contactor.Negative pressure not only shorten from perform disjunction just to have divided to contact time delay, also improve the breaking speed of contact, these 2 successes being all conducive to the quick disjunction of zero current are carried out simultaneously.
The operation principle of Self-correc ting control circuit Z: Self-correc ting control circuit Z is containing control button and test circuit, before AC contactor main contact energising, press control button, carry out intrinsic disjunction test operate time, be recorded in chip, as the correction parameter of Zero current disjunction, effectively prevent the dispersiveness of contactor action.Contactor, after working long hours, due to reasons such as the aging and contact abrasions of mechanism, changes, can carry out off-line calibration, guarantee the zero-current-break control of contactor, improve the reliability of control operate time.
Overvoltage and overcurrent protection: when Systematical control coil current declines fast, coil current is by two diode D2, D3 is fast to filter capacitor feedback electric energy, the magnetic field energy of magnetic circuit is converted into rapidly the electric field energy of filter capacitor, in this conversion process of energy, filter capacitor voltage can raise i.e. pumping voltage, system real-time detection filter electric capacity D pumping voltage and coil current I, if there is overvoltage and over current fault, then circuit is set to 0 state rapidly by system, module afterflow turns off, the pumping voltage avoiding continuation energy regenerative to cause continues to raise, and lock PWM, send sound and light alarm simultaneously, wait for hand-reset.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (5)
1. a digitlization overall process Dynamic controlling intelligent AC contactor, comprise an AC power (P), it is characterized in that: also comprise a digital control unit (M), described AC power (P) becomes direct current after rectification module (A) and filter capacitor (D), and the output of this direct current is connected with the first end of one end of resistance R1, the first electronic power switch (S1) and one end of the first fast recovery diode (D2); The earth terminal of this direct current is connected with one end of one end of resistance R2, the second fast recovery diode (D3) and the second end of the second electronic power switch (S4); The other end of described resistance R1 is connected with the other end of resistance R2; Second end of described first electronic power switch (S1), the second end of the second fast recovery diode (D3) are connected with one end of contactor coil (C); The other end of described first fast recovery diode (D2) is connected with the first end of the second electronic power switch (S4); Described digital control unit (M) be connected with for the self-tuning self-correcting circuit (Z) of described A.C. contactor break-time, contact current detection circuit (K), man-machine interface circuit (W), pumping voltage isolation sample circuit (U), for gathering the current sensor (I) of contactor coil electric current, the first isolated drive circuit (Q1) and the second isolated drive circuit (Q2); Operating state according to described first electronic power switch (S1), the second electronic power switch (S4) can define three kinds of circuit states: during the conducting simultaneously of the first electronic power switch (S1), the second electronic power switch (S4), direct current forward voltage is applied to coil two ends, and defining now circuit state is+1 state; First electronic power switch (S1), the second electronic power switch (S4) end simultaneously and coil current is non-vanishing time, coil current is by first and second fast recovery diode (D2, D3) afterflow, by energy feedback to filter capacitor (D), direct current negative voltage is born at contactor coil (C) two ends, and defining now circuit state is-1 state; First electronic power switch (S1), the second electronic power switch (S4) only have a conducting and coil current is non-vanishing time, coil is by one of them switching tube and a fast recovery diode afterflow, contactor coil terminal voltage is negative continued flow tube pressure drop, and defining now circuit state is 0 state.
2. digitlization overall process Dynamic controlling intelligent AC contactor according to claim 1, is characterized in that: the course of work of described A.C. contactor comprises three phases:
The adhesive stage: after receiving adhesive control command; digital control unit (M) starts to control A.C. contactor closed loop and starts; PWM control mode selects ON/OFF control model; ON/OFF control model is by being divided into multistage to control the timer in digital control unit (M); each section has a fiducial value; when sampled value is greater than fiducial value; output duty cycle is the pwm signal of 0%; on-off switching tube; if sampled value is less than fiducial value; then output duty cycle is the pwm signal of 100%, realizes high-speed switch and controls;
In the sticking stage: after attracting process terminates, A.C. contactor proceeds to sticking control program, now, by setting PWM operating frequency and duty ratio, circuit is switched fast between+1 state and-1 state, thus keeping coil electric current is dynamically constant;
The disjunction stage: utilize the High Speed Analog comparator in digital control unit (M) to carry out hardware and to walk abreast zero-detection, detection contact current zero-crossing point, when receiving disjunction instruction, digital control unit (M) performs disjunction instruction after carrying out the time delay of a period of time from a upper current zero-crossing point, fast circuit is set to-1 state, coil current quickly falls to 0, ensures the zero forefoot area quick disjunction of contact in setting, reduces breaking arc.
3. digitlization overall process Dynamic controlling intelligent AC contactor according to claim 2, is characterized in that: the described sticking stage has speed closed loop and current closed-loop two close cycles mode of operation, controls current inner loop with speed outer shroud; The execution frequency of a setting current inner loop, compared with set-point by the high-speed AD sampling coil current value of digital control unit (M), when being greater than set-point, duty ratio is updated to 0%, when being less than set-point, duty ratio is updated to 100%, current inner loop fast by current value adjustment to set-point; Speed outer shroud magnetic test coil electric current trailing edge slope, in starting process, when circuit is in-1 state, coil-end voltage is negative, and this negative pressure can force coil current to decline fast, coordinates the electric current under+1 state to rise fast, improves the governing speed of electric current.
4. digitlization overall process Dynamic controlling intelligent AC contactor according to claim 3, it is characterized in that: described digital control unit (M) have employed PWM pin and rewrites function, in starting process, artificial rewriting PWM pin state, the trailing edge slope that the trailing edge slope that-1 state is caused and motion back-emf cause is peeled off mutually, after digital control unit (M) completes slope detection, exit pin fast rewrite, by PWM module again adapter pin state, for by coil current quick adjustment to set-point, accomplish that slope detection and Current Control fast crosstalk are carried out, in starting process, optimizing contactor starting process by controlling dynamic speed unshakable in one's determination, reducing contact bounce.
5. digitlization overall process Dynamic controlling intelligent AC contactor according to claim 1; it is characterized in that: described Self-correc ting control circuit (Z) is containing control button and test circuit; before AC contactor main contact energising; press control button; carry out intrinsic disjunction test operate time; be recorded in chip, as the correction parameter of Zero current disjunction, effectively prevent the dispersiveness of contactor action; Contactor is after working long hours, and because mechanism is aging and contact abrasion, operate time changes, and carries out off-line calibration, guarantees the zero-current-break control of contactor, improves the reliability of control.
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