CN103456566A - Intelligent alternating current contactor capable of being controlled digitally and dynamically in whole process - Google Patents
Intelligent alternating current contactor capable of being controlled digitally and dynamically in whole process Download PDFInfo
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Abstract
The invention relates to the field of intelligent control over equipment, in particular to an intelligent alternating current contactor capable of being controlled digitally and dynamically in the whole process. A digital chip is used for realizing closed-loop control over the speed in an attraction process of the alternating current contactor (based on coil current falling edge slope), impact energy of a movable/static iron core and a movable/static contact is controlled directly, and bouncing of the iron core and the contact in the attraction process can be reduced substantially; the attraction and supporting process works in a current closed loop chopping mode, chopping frequency is adjusted automatically, and voice frequency noise is prevented from occurring; meanwhile, attraction and supporting currents can be kept stable in a wide input voltage range, and therefore energy-saving silent closed loop operation can be realized; a disjunction process applies direct current negative voltages to the two ends of a coil after rectification and filtration, so that the coil current is made to descend quickly, an electromagnetic system is demagnetized quickly, and the contact is disjunctive quickly at a moment before zero; the intelligent alternating current contactor also has a self correction function of zero-current disjunction, and therefore the problem that control over zero-current disjunction fails due to disperse movement of the contactor, abrasion of the contact and other factors can be solved.
Description
Technical field
The present invention relates to the apparatus field of intelligent control, particularly a kind of digitlization overall process is dynamically controlled intelligent AC contactor.
Background technology
The intellectuality of A.C. contactor is in recent years controlled development rapidly, the various control scheme occurred.The early stage open loop control program that mostly adopts the starting of A.C. contactor high-voltage direct-current, low-voltage direct-current to keep, the control module that is core by single-chip microcomputer combines with improved A.C. contactor body, realizes selectivity segmentation control and the operation of the energy-saving, noiseless in sticking stage of starting process.But, due to the A.C. contactor body construction, action dispersiveness unshakable in one's determination and coil is very large in the course of the work, even to the increase of same contactor work times, operating value also will change, and to Based Intelligent Control, bring certain difficulty.Along with the development of electronic technology and control technology, with the A.C. contactor pulse width modulation controlled scheme of FEEDBACK CONTROL, paid close attention to.Document [1-2] has proposed a kind of contactor pulse-width modulation Based Intelligent Control scheme of feedback with voltage, and the dynamic duty process of contactor and the heating situation of magnetic system are analyzed, document [3] adopts pulse modulation technology to control the permanent magnet contactor starting process, realized the permanent magnet contactor optimal control of position-sensor-free, but in its starting process, electric parameter is open loop control.The reactance voltage that document [4] has been studied the low capacity A.C. contactor falls the open loop control program, comprises the design of Switching Power Supply in control module and the realization of failure protection function.Document [5] has proposed a kind of A.C. contactor Based Intelligent Control scheme of closed loop copped wave starting, but the exciting curent of flexible contactor.In above control program, be all to using single-chip microcomputer as kernel control chip, whole service process to contactor is controlled, coordinate outside analog power control chip or switching circuit, the closed loop of the excitatory state of tentaculum of indirectly achieving a butt joint or open loop are controlled, make the performance of contactor obtain certain lifting, but required device is more, can not be by the achieve a butt joint direct control of the excitatory state of tentaculum of single control chip, be difficult to incorporate efficiently complicated control strategy in control procedure, restricted 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 of feedback intelligent contactor with voltage [J]. XI AN JIAOTONG UNIVERSITY Subject Index, 2010,44 (8): 90-95.
[3] Wang Xianbing, Lin Heyun, Fang Shuhua, etc. the weak magnetic control system of the intelligent permanent magnet contactor 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. closed loop copped wave starting A.C. contactor control module design [J]. Proceedings of the CSEE. 2013,33 (18): 132-139.
Summary of the invention
The objective of the invention is to invent a kind of digitlization overall process and dynamically control intelligent AC contactor.By adopting digitized chip to realize A.C. contactor attracting process speed closed loop control (based on coil current trailing edge slope), directly control the Impact energy of sound iron core and dynamic/static contact, can significantly reduce iron core and contact bounce in attracting process; Holding course works in current closed-loop copped wave pattern, automatically adjusts chopping frequency, prevents audio-frequency noise, can in wider input voltage range, maintain the stable of holding current simultaneously, carries out the energy-saving, noiseless operation with closed ring; Breaking course is applied to the coil two ends by the direct current negative pressure after rectifying and wave-filtering, force the coil current fast-descending, electromagnetic system demagnetizes fast, contact is a certain moment disjunction before zero rapidly, and there is the self-correcting function of Zero current disjunction, can overcome the zero-current-break control failure that the factors such as the action dispersiveness of contactor and contact abrasion cause.
The present invention adopts following scheme to realize: a kind of digitlization overall process is dynamically controlled 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 an end of resistance R 1, the first end of the first electronic power switch S1 and the end of the first fast recovery diode D2; The earth terminal of this direct current is connected with an end of resistance R 2, the end of the second fast recovery diode D3 and the second end of the second electronic power switch S4; The other end of described resistance R 1 is connected with the other end of resistance R 2; The second end of the second end of described the first electronic power switch S1, the second fast recovery diode D3 is connected with the end of contactor coil C; The other end of described the 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 for the self-tuning self-correcting circuit of described A.C. contactor break-time Z, contact current detection circuit K, man-machine interface circuit W, pump up voltage isolation sample circuit U, current sensor I, the first isolated drive circuit Q1 and the second isolated drive circuit Q2 for gathering the contactor coil electric current.
In an embodiment of the present invention, can define three kinds of circuit states according to the operating state of described the first electronic power switch S1, the second electronic power switch S4: when the first electronic power switch S1, the second electronic power switch S4 conducting simultaneously, the direct current forward voltage is applied to the coil two ends, and defining now circuit state is+1 state; The first electronic power switch S1, the second electronic power switch S4 end and coil current when non-vanishing simultaneously, coil current is by first and second fast recovery diode D2, D3 afterflow, energy feedback is arrived to filter capacitor D, contactor coil C bears the direct current negative voltage in two ends, and defining now circuit state is-1 state; The first electronic power switch S1, the second electronic power switch S4 only have a conducting and coil current when non-vanishing, coil is by one of them switching tube and a fast recovery diode afterflow, the 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 the adhesive control command; digital control unit M starts to control the starting of A.C. contactor closed loop; the PWM control mode is selected the ON/OFF control model, and the ON/OFF control model is divided into multistage by the timer by digital control unit M to be controlled, and each section has a fiducial value; when sampled value is greater than fiducial value; the pwm signal that output duty cycle is 0%, on-off switching tube, if sampled value is less than fiducial value; the pwm signal that output duty cycle is 100%, realize high-speed switch control;
The sticking stage: after attracting process finishes, A.C. contactor proceeds to the sticking control program, now, by setting PWM operating frequency and duty ratio, make circuit switching fast between+1 state and-1 state, thereby the keeping coil electric current is dynamically constant;
The disjunction stage: utilize the high speed analog comparator in digital control unit M to carry out the parallel zero-detection of hardware, the detection contact current zero-crossing point, when receiving the disjunction instruction, digital control unit M can from current zero-crossing point start to carry out to carry out the disjunction instruction after the time delay of a period of time, fast circuit is set to-1 state, coil current quickly falls to 0, guarantees that contact, in the quick disjunction of zero forefoot area of setting, reduces breaking arc.
In an embodiment of the present invention, the described sticking stage has speed closed loop and the two closed loop mode of operation of current closed-loop, with the speed outer shroud, controls current inner loop; Set the execution frequency of a current inner loop, high-speed AD sampling coil current value by digital control unit (M) and with set-point relatively, when being greater than set-point, duty ratio is updated to 0%, when being less than set-point, duty ratio is updated to 100%, and current inner loop arrives set-point by current value adjustment fast; Speed outer shroud magnetic test coil electric current trailing edge slope, in starting process, when circuit, during in-1 state, coil-end voltage is for negative, and this negative pressure can force the coil current fast-descending, coordinates the electric current fast rise under+1 state, improves the governing speed of electric current;
In an embodiment of the present invention, described digital control unit M has adopted the PWM pin to rewrite function, in starting process, the artificial PWM pin state of rewriting, the trailing edge slope that the trailing edge slope that-1 state is caused and motion back-emf cause is peeled off mutually, exits fast pin and rewrite after digital control unit M completes slope detection, by the PWM module, again takes over the pin state, for by the coil current quick adjustment to set-point, accomplish that slope detection and Current Control fast crosstalk carries out; Optimize the contactor starting process by controlling moving speed unshakable in one's determination in starting process, reduce contact bounce.
In an embodiment of the present invention, described self-correcting is controlled circuit Z containing control button and test circuit, before the 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 avoided the dispersiveness of contactor action.Contactor, after working long hours, due to reasons such as the aging and contact abrasions of mechanism, changes operate time, can carry out off-line calibration, guarantees the zero-current-break control of contactor, has improved the reliability of controlling.
The appearance of digital signal controller, make data processing speed and precision obtain larger lifting; Peripheral circuit is integrated, simplified hardware designs, have more cost advantage, wiring is simple, and the electromagnetic interference less is 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 has designed a kind of A.C. contactor digitlization overall process dynamic control scheme, adopt digitized chip to realize A.C. contactor attracting process speed closed loop control (based on coil current trailing edge slope), directly control the Impact energy of sound iron core and dynamic/static contact, can significantly reduce iron core and contact bounce in attracting process; Holding course works in current closed-loop copped wave pattern, automatically adjusts chopping frequency, prevents audio-frequency noise, can in wider input voltage range, maintain the stable of holding current simultaneously, carries out the energy-saving, noiseless operation with closed ring; Breaking course is applied to the coil two ends by the direct current negative pressure after rectifying and wave-filtering, force the coil current fast-descending, electromagnetic system demagnetizes fast, contact is a certain moment disjunction before zero rapidly, and there is the self-correcting function of Zero current disjunction, can overcome the zero-current-break control failure that the factors such as the action dispersiveness of contactor and contact abrasion cause.
With the Based Intelligent Control scheme of current A.C. contactor, compare, this problem has following advantage:
(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, and realized the software control flexibly of the excitatory state of magnetic circuit, is convenient to incorporate Intelligent Control Strategy in programming; Use after digital control and can dynamically change circuit structure, only depend on software control just can make circuit change between+1 state ,-1 state, 0 state; Contactor coil is high frequency pumping, at switching tube conducting and shutdown moment, can exist spike to disturb, and adopts after digital control can avoid spike and sampled, accurately magnetic test coil electric current and contact zero crossing; Can repeated detection calculate average current when calculating the electric current slope, then use the average current slope calculations, slope be calculated more accurate; These are all that analogue system and single-chip computer control system can't be accomplished.
(2) main circuit has adopted brand-new topological structure.Adopt two switching tubes to coordinate two fast recovery diodes can apply easily positive or negative driving voltage at the coil two ends, accelerated the governing speed of coil current, while having avoided applying negative pressure again, coil current is reverse simultaneously, prevent from occurring the phenomenon of heavily adhesive in disjunction is controlled, by the flexible control to the switching tube conducting state, can make circuit change flexibly between+1 state ,-1 state, 0 state, facilitate contactor attracting process speed closed loop to control and quick disjunction control.
(3) attracting process speed closed loop, slope detection are controlled.In attracting process, adopt speed closed loop to control the directly speed moving unshakable in one's determination of control contactor, and then directly controlled the stroke speed of dynamic/static contact and the stroke speed of sound iron core, from reducing in essence contact bounce; Speed closed loop is controlled and can be avoided the situation that speed unshakable in one's determination is 0 in the contactor starting process in addition, guarantees the reliable adhesive of contactor; Adopt slope detection indirectly to reflect that contactor moves speed unshakable in one's determination, thereby the contactor speed closed loop that carries out Speedless sensor is controlled, compare (general presence bit displacement sensor in circuit breaker) cost with the scheme of speed sensor low, there do not is installation question, also avoided 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, increased self-correcting off-line calibration function, before the AC contactor main contact energising, carry out intrinsic disjunction test operate time, it is recorded in chip, as the correction parameter of Zero current disjunction, has effectively avoided the dispersiveness of contactor action.After contactor works long hours, can also carry out the calibration of operate time, effectively improved the reliability of zero-current-break control, improved the contactor life-span.Simultaneously, the negative pressure that bear at the coil two ends, accelerated the decrease speed of coil current and the breaking speed of contact, reduced the impact of the dispersiveness of contactor action, the accurate control that has improved breaking course.
The accompanying drawing explanation
Fig. 1 is the dynamic control principle block diagram of digitlization self-correcting overall process.
In figure, P is AC power, A is rectification module, D is filter capacitor, R1, R2 are divider resistance, S1 is the first electronic power switch, S4 is the second electronic power switch, and D2, D3 are first and second fast recovery diode, and C is contactor coil, I is current sensor, W is man-machine interface circuit, and U is pump up voltage isolation sample circuit, and M is digital control unit, Z is that circuit is controlled in self-correcting, K is the 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 dynamically to control 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 an end of resistance R 1, the first end of the first electronic power switch S1 and the end of the first fast recovery diode D2; The earth terminal of this direct current is connected with an end of resistance R 2, the end of the second fast recovery diode D3 and the second end of the second electronic power switch S4; The other end of described resistance R 1 is connected with the other end of resistance R 2; The second end of the second end of described the first electronic power switch S1, the second fast recovery diode D3 is connected with the end of contactor coil C; The other end of described the 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 for the self-tuning self-correcting circuit of described A.C. contactor break-time Z, contact current detection circuit K, man-machine interface circuit W, pump up voltage isolation sample circuit U, current sensor I, the first isolated drive circuit Q1 and the second isolated drive circuit Q2 for gathering the contactor coil electric current.
Concrete, AC power P, after rectification module A and filter capacitor D, becomes direct current stably; S1, S4 are electronic power switch, can control its conducting or cut-off, D2, D3 are fast recovery diode, in the time of can defining 3 kinds of circuit state: S1, S4 conducting simultaneously according to the state of S1, two switching tubes of S4, the direct current forward voltage is applied to the coil two ends, and defining now circuit state is+1 state; S1, S4 end and coil current when non-vanishing simultaneously, and coil current is by diode D2, D3 afterflow, and by energy feedback, to filter capacitor, the direct current negative voltage is born at the coil two ends, and defining now circuit state is-1 state; S1, S4 only have a conducting and coil current when non-vanishing, and 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 detection of the contactor coil electric current; Man-machine interface circuit W is for the on off control of system, and the on-line operation of module or self-correcting condition selecting and running status show; Resistance R 1, R2 and pump up voltage isolation sample circuit U are for detection of the pump up voltage of filter capacitor; Isolated drive circuit Q1 and isolated drive circuit Q2 are respectively used to driving switch pipe S1, S4; Contact current detection circuit K is for detection of the current value of main noddle on contactor; Self-correcting circuit Z is for the self-correcting of contactor break-time; The core of whole control system is numerical control system M, according to coil current value and contact current value, 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.
The course of work is as follows:
1, the adhesive stage: after receiving the adhesive control command, numerical control system M starts to control the starting of A.C. contactor closed loop, the PWM control mode is selected the ON/OFF control model, and the ON/OFF control model is divided into multistage by the timer by chip to be controlled, and each section has a fiducial value, when sampled value is greater than fiducial value, the pwm signal that output duty cycle is 0%, on-off switching tube, if sampled value is less than fiducial value, the pwm signal that output duty cycle is 100%, realize high-speed switch control.The sticking stage has speed closed loop and the two closed loop mode of operation of current closed-loop, with the speed outer shroud, controls current inner loop, set the execution frequency of a current inner loop, high-speed AD sampling coil current value by digital control system and with set-point relatively, 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%, and current inner loop arrives set-point by current value adjustment fast, speed outer shroud magnetic test coil electric current trailing edge slope, in starting process, when circuit during in-1 state, coil-end voltage is for negative, this negative pressure can force the coil current fast-descending, coordinate the electric current fast rise under+1 state, improved the governing speed of electric current, the fast dynamic response of electric current is controlled speed closed loop unshakable in one's determination becomes possibility, in the electric current trailing edge slope that the motion back-emf causes but the electric current trailing edge slope that-1 state causes is added to simultaneously, make speed closed loop control the difficulty that becomes, the present invention has adopted the PWM pin to rewrite function, in starting process, the artificial PWM pin state of rewriting, the trailing edge slope that the trailing edge slope that-1 state is caused and motion back-emf cause is peeled off mutually, exiting fast pin after chip completes slope detection rewrites, again take over the pin state by the PWM module, for the coil current quick adjustment is arrived to set-point, accomplish that slope detection and Current Control fast crosstalk carries out, optimize the contactor starting process by controlling moving speed unshakable in one's determination in starting process, reduce contact bounce, this is a kind of brand-new control thinking, only has and has adopted digit chip just may complete.
2, the sticking stage: after attracting process finishes, contactor proceeds to the sticking control program, now, by setting PWM operating frequency and duty ratio, make circuit switching fast between+1 state and-1 state, thereby the keeping coil electric current is dynamically constant, and the coil current of contactor is maintained to a lower numerical value, can guarantee chopping frequency again, avoided Electromagnetic System of Contactor to produce audio-frequency noise simultaneously.
3, the disjunction stage: utilize the high speed analog comparator in numerical control system M to carry out the parallel zero-detection of hardware, the detection contact current zero-crossing point, when receiving the disjunction instruction, system can from current zero-crossing point start to carry out to carry out the disjunction instruction after the time delay of a period of time, fast circuit is set to-1 state, coil current quickly falls to 0, guarantees that contact, in the quick disjunction of zero forefoot area of setting, reduces breaking arc.
In breaking course, negative pressure has been accelerated the decrease speed of electric current and the breaking speed of contact, reduced dispersed impact, can accurately control the 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 has not only shortened the time delay just having divided from the execution disjunction to contact, has also improved the breaking speed of contact simultaneously, and these 2 successes that all are conducive to the quick disjunction of zero current are carried out.
The operation principle of circuit Z is controlled in self-correcting: self-correcting is controlled circuit Z containing control button and test circuit, before the 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 avoided the dispersiveness of contactor action.Contactor, after working long hours, due to reasons such as the aging and contact abrasions of mechanism, changes operate time, can carry out off-line calibration, guarantees the zero-current-break control of contactor, has improved the reliability of controlling.
Overvoltage and overcurrent protection: during system control coil electric current fast-descending, coil current is by two diode D2, D3 is fast to the 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, it is the pump up voltage that filter capacitor voltage can raise, the real-time detection filter electric capacity of system D pump up voltage and coil current I, if overvoltage and over current fault occur, system is set to circuit rapidly 0 state, the module afterflow is turn-offed, avoid continuing the pump up voltage continuation rising that energy regenerative causes, and locking PWM, send sound and light alarm simultaneously, wait for hand-reset.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing 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 (6)
1. a digitlization overall process is dynamically controlled 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 an end of resistance R 1, the first end of the first electronic power switch (S1) and an end of the first fast recovery diode (D2); The earth terminal of this direct current is connected with an end of resistance R 2, an end of the second fast recovery diode (D3) and the second end of the second electronic power switch (S4); The other end of described resistance R 1 is connected with the other end of resistance R 2; The second end of the second end of described the first electronic power switch (S1), the second fast recovery diode (D3) is connected with an end of contactor coil (C); The other end of described the 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 for the self-tuning self-correcting circuit of described A.C. contactor break-time (Z), contact current detection circuit (K), man-machine interface circuit (W), pump up voltage isolation sample circuit (U), current sensor (I), the first isolated drive circuit (Q1) and the second isolated drive circuit (Q2) for gathering the contactor coil electric current.
2. digitlization overall process according to claim 1 is dynamically controlled intelligent AC contactor, it is characterized in that: according to the operating state of described the 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, the direct current forward voltage is applied to the coil two ends, and defining now circuit state is+1 state; The first electronic power switch (S1), the second electronic power switch (S4) end and coil current when non-vanishing simultaneously, coil current is by first and second fast recovery diode (D2, D3) afterflow, energy feedback is arrived to filter capacitor (D), the direct current negative voltage is born at contactor coil (C) two ends, and defining now circuit state is-1 state; The first electronic power switch (S1), the second electronic power switch (S4) only have a conducting and coil current when non-vanishing, coil is by one of them switching tube and a fast recovery diode afterflow, the contactor coil terminal voltage is negative continued flow tube pressure drop, and defining now circuit state is 0 state.
3. digitlization overall process according to claim 2 is dynamically controlled intelligent AC contactor, it is characterized in that: the course of work of described A.C. contactor comprises three phases:
The adhesive stage: after receiving the adhesive control command, digital control unit (M) starts to control the starting of A.C. contactor closed loop, the PWM control mode is selected the ON/OFF control model, and the timer in digital control unit (M) is divided into multistage to be controlled, and each section has a fiducial value, when sampled value is greater than fiducial value, the pwm signal that output duty cycle is 0%, on-off switching tube, if sampled value is less than fiducial value, the pwm signal that output duty cycle is 100%, realize high-speed switch control;
The sticking stage: after attracting process finishes, A.C. contactor proceeds to the sticking control program, now, by setting PWM operating frequency and duty ratio, make circuit switching fast between+1 state and-1 state, thereby the keeping coil electric current is dynamically constant;
The disjunction stage: utilize the high speed analog comparator in digital control unit (M) to carry out the parallel zero-detection of hardware, the detection contact current zero-crossing point, when receiving the disjunction instruction, digital control unit (M) can from current zero-crossing point start to carry out to carry out the disjunction instruction after the time delay of a period of time, fast circuit is set to-1 state, coil current quickly falls to 0, guarantees that contact, in the quick disjunction of zero forefoot area of setting, reduces breaking arc.
4. digitlization overall process according to claim 3 is dynamically controlled intelligent AC contactor, it is characterized in that: the described sticking stage has speed closed loop and the two closed loop mode of operation of current closed-loop, with the speed outer shroud, controls current inner loop; Set the execution frequency of a current inner loop, high-speed AD sampling coil current value by digital control unit (M) and with set-point relatively, when being greater than set-point, duty ratio is updated to 0%, when being less than set-point, duty ratio is updated to 100%, and current inner loop arrives set-point by current value adjustment fast; Speed outer shroud magnetic test coil electric current trailing edge slope, in starting process, when circuit, during in-1 state, coil-end voltage is for negative, and this negative pressure can force the coil current fast-descending, coordinates the electric current fast rise under+1 state, improves the governing speed of electric current.
5. digitlization overall process according to claim 4 is dynamically controlled intelligent AC contactor, it is characterized in that: described digital control unit (M) has adopted the PWM pin to rewrite function, in starting process, the artificial PWM pin state of rewriting, the trailing edge slope that the trailing edge slope that-1 state is caused and motion back-emf cause is peeled off mutually, exiting fast pin after digital control unit (M) completes slope detection rewrites, again take over the pin state by the PWM module, for the coil current quick adjustment is arrived to set-point, accomplish that slope detection and Current Control fast crosstalk carries out, optimize the contactor starting process by controlling moving speed unshakable in one's determination in starting process, reduce contact bounce.
6. digitlization overall process according to claim 1 is dynamically controlled intelligent AC contactor, it is characterized in that: described self-correcting is controlled circuit (Z) containing control button and test circuit, before the 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 avoided the dispersiveness of contactor action; Contactor, after working long hours, due to reasons such as the aging and contact abrasions of mechanism, changes operate time, can carry out off-line calibration, guarantees the zero-current-break control of contactor, has improved the reliability of controlling.
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