CN102768924A - Undervoltage tripper with low power consumption and applicable to three-phase supply - Google Patents
Undervoltage tripper with low power consumption and applicable to three-phase supply Download PDFInfo
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- CN102768924A CN102768924A CN2012102276657A CN201210227665A CN102768924A CN 102768924 A CN102768924 A CN 102768924A CN 2012102276657 A CN2012102276657 A CN 2012102276657A CN 201210227665 A CN201210227665 A CN 201210227665A CN 102768924 A CN102768924 A CN 102768924A
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Abstract
The invention relates to an undervoltage tripper with low power consumption and applicable to a three-phase supply. The undervoltage tripper comprises an electromagnet coil, an armature, a rectification circuit, a buck circuit, a relay, line voltage detection modules, a sampling circuit and a main control module, wherein the main control module stores a rated voltage Ue and a strong start voltage value and is used for collecting an output voltage and a voltage period of each line voltage detection module, so that an effective value of each line voltage of the three-phase supply is calculated; when the effective value of each line voltage of the three-phase supply reaches to 80% of the rated voltage Ue and a sampling voltage of the sampling circuit reaches to the strong start voltage value, a normally opened contact is closed firstly, and a switch circuit is turned on, after the armature is closed, the normally open contact is disconnected; and when the effective value of any one line voltage is less than 50% of the rated voltage Ue, the switch circuit is turned off.
Description
Technical field
The present invention relates to a kind of low-power consumption and be applicable to the device for under-voltage releasing equipment of three phase mains.
Background technology
Device for under-voltage releasing equipment is a circuit breaker, especially one of critical elements of frame-type circuit breaker.Under-voltage release is when its terminal voltage is reduced to a certain prescribed limit; Make circuit breaker that a kind of release of delaying time or not having the time-delay disconnection arranged; When supply voltage descends (even slowly descending) in 70% to 35% scope of rated operational voltage; Under-voltage release should move (trip coil dead electricity; Moving armature has back-moving spring to eject-thread off in the coil), under-voltage release equals 35% o'clock of release rated operational voltage at supply voltage, and under-voltage release should be able to prevent breaker closing; When supply voltage is equal to or greater than the rated operational voltage of 85% under-voltage release; Under hot condition; Should be able to guarantee that (trip coil gets the reliable closure of circuit breaker; The interior moving armature of coil has the coil electromagnetic force to overcome the spring force suction and keeps certain moment-" adhesive ", and closing a floodgate for circuit breaker is reliable provides condition).The essence of undervoltage tripping, be prevent circuit breaker subordinate electric equipment be operated under the under-voltage condition electric current excessive after, the effective measures that the electric equipment self-heating increases the weight of.
With reference to mentioned above principle, existing device for under-voltage releasing equipment is the single phase poaer supply working method mostly.Incorporate device for under-voltage releasing equipment in the three-phase circuit, also not seeing has comparatively ripe device for under-voltage releasing equipment scheme and product to occur.
And existing device for under-voltage releasing equipment, the comparatively simple mostly or imperfection of circuit design is disturbing near the circuit breaker of comparatively serious occasion, especially intermediate frequency use occasion, and device for under-voltage releasing equipment wherein usually receives intermediate frequency and disturbs and misoperation.Perhaps in the occasion of marine generator frequency change, because of frequency change causes the device for under-voltage releasing equipment misoperation.The misoperation of device for under-voltage releasing equipment has caused the mistake separating brake of circuit breaker.
Summary of the invention
The technical problem that the present invention will solve provides a kind of quick startup, the device for under-voltage releasing equipment that is applicable to three phase mains of low-power consumption.
For solving the problems of the technologies described above, the present invention provides a kind of low-power consumption and is applicable to the device for under-voltage releasing equipment of three phase mains, comprising: electromagnet coil, by the armature of said electromagnet coil control; Rectification circuit, its input links to each other with arbitrary line voltage in the three phase mains; Reduction voltage circuit, its input links to each other with the positive output end of said rectification circuit, its output links to each other with the current input terminal of said electromagnet coil, is used to provide the voltage of keeping the armature adhesive; Relay, one of which links to each other with the output of said rectification circuit and the current input terminal of said electromagnet coil respectively to normally opened contact; Switching circuit, the current output terminal of said electromagnet coil links to each other with the input of this switching circuit; The line voltage detection module is located at the output of said three phase mains, is used for detecting at least two group line voltages; Sample circuit is used to detect the output voltage of said rectification circuit; Main control module; Store rated voltage Ue and the strong magnitude of voltage that starts; The output voltage that is used to gather said each line voltage detection module to be calculating each line voltage effective word of said three phase mains, and when each line voltage effective value of said three phase mains reaches 80% of rated voltage Ue simultaneously, and the sampling voltage of sample circuit is when reaching the magnitude of voltage of said strong startup; The said normally opened contact of control is closed earlier; The said switching circuit conducting of back control, treat said armature adhesive after, control said normally opened contact again and break off; If arbitrary line voltage effective value is lower than at 50% o'clock of rated voltage Ue, then controls said switching circuit and break off.
Further, said main control module also is used for: according to the rise of output voltage of gathering said each line voltage detection module along or trailing edge obtain the frequency or the cycle of the line voltage of said three phase mains, to calculate each line voltage effective value of said three phase mains.The present invention is the magnitude of voltage and the cycle of the sampling through said main control module detection line voltage detection module road output earlier; To obtain the voltage effective value of line accurately of outer net (being three phase mains); Whether the effective value that can judge the line voltage of outer net more accurately reaches 80% of rated voltage Ue; So this release also is fit to apply to the occasion of different frequency very much, be particularly suitable for the alternating voltage that frequency is 20Hz～65Hz.So can also solve the device for under-voltage releasing equipment that second technical problem provides a kind of anti-harmonic wave and be applicable to the multi-frequency three phase mains.
Further, the electric current during for the said electromagnet coil short circuit of more effective reduction is avoided circuit burnout, establishes a decompression capacitor CK at the input of said rectification circuit, and the capacitive reactance of said decompression capacitor CK makes short circuit current littler.
Further, in order better to avoid harmonic wave in the electrical network, establish an EMC (electromagnetic compatibility) power-supply filter at the input of said rectification circuit to the interference of release.The EMC power-supply filter; Have another name called " Electro Magnetic Compatibility filter "; Be mainly used in instrument and meter, the automation control system; Be used for suppressing and eliminate on-the-spot strong electromagnetic of industrial automation system and electric spark interference, proofread and correct the field instrumentation instrument, guarantee the safe and reliable operation of automation control system
Further; In order to make said solenoid obtain high pressure; Establish the last one at said reduction voltage circuit input and start capacitor C 1, charging voltage is
doubly the 3-5 of electromagnet coil rated operational voltage (is about doubly) of input ac voltage.Switching circuit is connected moment, and storage capacitor C1 goes up electric charge and all discharges through solenoid, reaches the purpose of " the strong startup " adhesive.
For fear of the interference of peripheral electrical network to weak electric signal, said line voltage detection module comprises: the reduction voltage circuit that links to each other with line voltage, with the photoelectrical coupler that the reduction voltage circuit output links to each other, the output of said photoelectric coupled circuit links to each other with said main control module.
Said main control module can be single-chip microcomputer (MCU), SOC(system on a chip) (SOC), CPLD, FPGA or the ARM and the DSP of any model.
Further, in order to use in the occasion that is needing delayed releasing, said main control module is a single chip circuit, and it comprises: what link to each other with single-chip microcomputer is suitable for setting the BCD toggle switch that the said switching circuit of control is delayed time opening time.
Further, the power unit of said main control module, switching circuit, relay is all provided by said reduction voltage circuit.
Further, in order to prevent pouring in down a chimney of VH voltage, stop said normally opened contact to break off the back-emf of said electromagnet coil generation of moment on the other hand, the protection reduction voltage circuit.Said device for under-voltage releasing equipment also comprises, a diode D2, and the anode of said diode D2 links to each other with the output of said reduction voltage circuit, and its negative electrode links to each other with said electromagnet coil input.
A kind of anti-harmonic wave, multi-frequency and be applicable to the method for work of the device for under-voltage releasing equipment of three phase mains comprise:
1. after said device for under-voltage releasing equipment inserted three phase mains, said main control module detected and calculates the effective value of each line voltage of said three phase mains through the line voltage detection module;
2. when described each line voltage reach simultaneously described rated voltage Ue 80% after; Said main control module carries out sample acquisitions to the output voltage of said rectification circuit; When if this output voltage reaches the magnitude of voltage of said strong startup; Normally opened contact between the output that is connected in said rectification circuit of the first control relay of said main control module and the current input terminal of electromagnet coil is closed; Control the switching circuit conducting that links to each other with the current output terminal of said electromagnet coil again, so that said electromagnet coil gets is electric, i.e. armature adhesive;
Then, control said normally opened contact and break off, promptly only the voltage of keeping said armature adhesive is provided by said reduction voltage circuit;
3. when arbitrary line voltage be lower than described rated voltage Ue 50% the time, the said switching circuit of said master control module controls breaks off so that said electromagnet coil dead electricity, promptly armature ejects.
Further, judge the method that said electromagnet coil inserts, comprising:
A: when said line voltage just often, if when said sampling voltage is not equal to the said magnitude of voltage of keeping the armature adhesive, then said master control module controls switching circuit breaks off;
B: when said sampling voltage returns to the magnitude of voltage of said strong startup, then said main control module produces the said switching circuit conducting of a control, to detect the pulse signal whether said electromagnet coil inserts;
C: when said sampling voltage descends, judge that then said electromagnet coil inserts, wait for that said main control module was then controlled said switching circuit conducting so that said electromagnet coil gets when said sampling voltage arrived the magnitude of voltage of said strong startup.
The present invention has the following advantages: (1) starts through the reduction voltage circuit control relay and keeps voltage and switch, the big problem of coil heating amount when having overcome existing device for under-voltage releasing equipment operate as normal; Through the strong startup capacitor C 1 that inserts, overcome staring torque little, often not adhesive phenomenon and make circuit design simple arranged; (2) through the line voltage detection module; Detect two groups of line voltages simultaneously; Obtain the magnitude of voltage of three phase lines; And judge through single-chip microcomputer whether input voltage reaches 80% of rated voltage, and make release work in three phase mains through detecting strong starting resistor, solved the technical problem that existing device for under-voltage releasing equipment can not be worked etc. under three phase mains; (3) adopt single-chip microcomputer to carry out under-voltage control, can effectively reduce power consumption; (4) the line voltage detection module that adopts, it is coupled through photoelectricity and realizes the collection of SA, SB signal, and circuit is simple, and isolation effect is good; (5) pass through single-chip microcomputer and line voltage detection module to the detection of mains frequency, further obtain effective value accurately, can guarantee that the armature adhesive reaches enough rated voltages, and widen the use occasion of release; (6) can effectively remove the interference of harmonic wave in the electrical network to the collection of mains frequency, cooperate, more can effectively avoid the Harmonic Interference in the electrical network with EMC bidirectional filtering power-supply filter.
Description of drawings
For content of the present invention is more clearly understood, below basis specific embodiment and combine accompanying drawing, the present invention is done further detailed explanation, wherein
The circuit theory diagrams that Fig. 1 is multi-frequency and the device for under-voltage releasing equipment that is applicable to three phase mains for anti-harmonic wave of the present invention;
Fig. 2 is the circuit structure one of line voltage detection module of the present invention;
Fig. 3 is the circuit structure two of line voltage detection module of the present invention;
Fig. 4 is the Voltammetric Relation curve chart of said photoelectrical coupler of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is elaborated:
The parameter designing of interchange shunt release of the present invention meets the important technological parameters that low voltage switchgear and control appliance standard: GB14048.1-2006 and GB14048.2-2008 have defined device for under-voltage releasing equipment.Under the requirement of this standard, the following examples of giving an example describe.
See Fig. 1-2, a kind of device for under-voltage releasing equipment comprises: electromagnet coil 3, by the armature of said electromagnet coil 3 controls; Rectification circuit 1, its input links to each other with arbitrary line voltage in the three phase mains; Reduction voltage circuit 2, its input links to each other with the positive output end of said rectification circuit 1, its output links to each other with the current input terminal of said electromagnet coil 3, is used to provide the voltage of keeping the armature adhesive; Relay 4, one of which links to each other with the output of said rectification circuit 1 and the current input terminal of said electromagnet coil 3 respectively to normally opened contact; Switching circuit 7, the current output terminal of said electromagnet coil 3 links to each other with the input of this switching circuit 7; The line voltage detection module is located at the output of said three phase mains, is used for detecting at least two group line voltages; Sample circuit 5 is used to detect the output voltage of said rectification circuit 1; Main control module 8; Store rated voltage Ue and the strong magnitude of voltage that starts; The output voltage that is used to gather said each line voltage detection module 6 to be calculating each line voltage effective value of said three phase mains, and when each line voltage effective value of said three phase mains reaches 80% of rated voltage Ue simultaneously, and the sampling voltage of sample circuit 5 is when reaching the magnitude of voltage of said strong startup; The said normally opened contact of control is closed earlier; Said switching circuit 7 conductings of back control, treat said armature adhesive after, control said normally opened contact again and break off; If arbitrary line voltage effective value is lower than at 50% o'clock of rated voltage Ue, then controls said switching circuit 7 and break off.Said main control module 8 also is used for: according to the rise of output voltage of gathering said each line voltage detection module along or trailing edge obtain the frequency or the cycle of the line voltage of said three phase mains, to calculate each line voltage effective value of said three phase mains.Concrete grammar is: said main control module is opened rising edge and the trailing edge of interruption with detection line voltage detection module road output SA, SB signal; With cycle or the frequency that obtains line voltage; And calculate to obtain the voltage effective value of line accurately of outer net with the magnitude of voltage of the sampling of line voltage detection module road output; Whether the effective value that can judge outer net voltage more accurately reaches 80% of rated voltage Ue; So this release also is fit to apply to the occasion of different frequency very much, be particularly suitable for the alternating voltage that frequency is 20Hz～65Hz.
Establish a decompression capacitor CK and EMC power-supply filter at the input of said rectification circuit 1.
Establish the last one at the output of said rectification circuit 1 and start capacitor C 1.
Said line voltage detection module comprises: the reduction voltage circuit 6-1 that links to each other with line voltage, and the photoelectrical coupler 6-2 that links to each other with the reduction voltage circuit output, the output of said photoelectric coupled circuit 6-2 links to each other with said main control module 8.
Said line voltage detection module can also adopt rectification circuit to link to each other with a bleeder circuit, takes a sample from the dividing potential drop end, keeps the linear relationship of sampling voltage.
Said reduction voltage circuit also provides the working power of said main control module, switching circuit, relay.
Said main control module 8 is a single chip circuit, and it comprises: being suitable for of linking to each other with single-chip microcomputer set the said switching circuit of the control BCD toggle switch of 7 time-delay opening times.
Said main control module 8 can be single-chip microcomputer (MCU), SOC(system on a chip) (SOC), CPLD, FPGA or ARM and DSP.
Embodiment 2
See Fig. 1-3, on the basis of embodiment 1, the execution mode of this device for under-voltage releasing equipment major part is described.
Alternating current forms all-wave pulsating voltage VH to said strong startup capacitor C 1 charging through behind the said rectification circuit 1.VH voltage is given said main control module 8 power supplies after reduction voltage circuit 2 step-downs are arranged, and provides power supply to said relay 4 and switching circuit 2 simultaneously, and it is said electromagnet coil 3 power supplies that said reduction voltage circuit 2 forms voltage VO voltage VP after diode D2 isolates.Resistance R 1 and R2 form the sampling circuit of VH, and sampled signal SH send said main control module 8.
Wherein said line voltage detection module comprises: connect the first line voltage detection module 6a and the second line voltage detection module 6b between any two line voltages respectively; Said main control module 8 interrupts the output voltage SA from the first line voltage detection module (6a) through rising edge (or trailing edge); The output voltage SB of the second line voltage detection module (6b); Obtain electrical network cycle time (frequency), and the SA several times of in one-period, sampling, methods such as FFT used; Calculate " effective value " of corresponding grid line voltage; According to effective value, judgement was greater than 80% o'clock of nominal voltage (rated voltage), and said main control module 8 further judges whether voltage VH has reached certain value simultaneously.When these two conditions all satisfy; Said main control module 8 control relay make contacts are 1.-2., and for said electromagnet coil 3 provides a high starting resistor, then; The said switching circuit 2 of said main control module 8 controls is connected said electromagnet coil 3, and said electromagnet coil 3 has been realized strong startup.After strong startup was accomplished, 1. said main control module 8 controlled said relay 4 break contacts-and 2., voltage VP keeps said electromagnet coil 3 certain moments.When effective value less than nominal voltage 50% the time; The said switching circuit 2 of said main control module 8 controls breaks off the electric current of said electromagnet coil 3; Said electromagnet coil 3 inner back-moving springs eject armature, and armature backs down the circuit breaker self-locking mechanism, realizes the separating brake of circuit breaker.
Isolating diode D1 is set after full-wave rectification, makes charging voltage (VH) on the said strong startup capacitor C 1, do not influence the information of electrical network pulsating voltage (SP).For resolving line voltage cycle, harmonic wave, convenience is provided.
Among the present invention; 1. said relay 4 goes ahead of the rest make contact-2.; The starting resistor of said electromagnet coil 3; Be the charging voltage (VH) of said strong startup capacitor C 1, be
times (being the several times of said electromagnet coil 3 rated operational voltages) of input ac voltage.Said switching circuit 2 is connected moment, and electric charge all discharges through said electromagnet coil 3 on the said strong startup capacitor C 1, reaches the purpose of " the strong startup " adhesive.The power of strong startup, said strong startup capacitor C 1 capacity can also come further to optimize except that satisfying the reduction voltage circuit minimum requirements through the capacitance of the said strong startup capacitor C 1 of suitable increasing.
Among the present invention, the current input terminal predetermined fixed of said electromagnet coil 3 connects voltage VP, prevents that the contact is 1.-and 2. the transition period, said electromagnet coil 3 loses voltage and breaks off voluntarily.After said electromagnet coil the last 3 starts; Keep the prime power of said electromagnet coil 3 through voltage VP, satisfy the requirement of said electromagnet coil 3 low power runs, both realized that big moment started; Make that again the whole caloric value of device for under-voltage releasing equipment is little, its circuit structure is simple.
Among the present invention; The output voltage VO of reduction voltage circuit 2 forms VP to said electromagnet coil 3 power supplies after said diode D2 isolates; Said diode D2 prevents pouring in down a chimney of VH voltage on the one hand; Stop the contact on the other hand 1.-2. break off the back-emf of said electromagnet coil 3 generations of moment, the protection reduction voltage circuit.
Among the present invention, input voltage is through full-wave rectification, and said isolating diode D1 isolates the back to said strong startup C1 charging, and generation 5V, 12V and the VO voltage of reduction voltage circuit is arranged.These three groups of voltages have nothing to do with frequency of input voltage, harmonic wave.
Among the present invention, the electrical network cycle (frequency) that said main control module 8 obtains through the line voltage detection module, accurately resolve the effective value that SA, SB calculated signals go out grid line voltage, effective value is corresponding with the cycle.According to effective value, judgement was greater than 80% o'clock of nominal voltage, and said main control module 8 further judges whether VH has reached certain value simultaneously.When these two conditions all satisfy; 1. said main control module 8 controls said relay 4 make contacts-2.; For said electromagnet coil 3 provides a high starting resistor, then, the said switching circuit 2 of said main control module 8 controls is connected said electromagnet coil 3; Said electromagnet coil 3 has been realized strong startup, has guaranteed absolutely adhesive.
See Fig. 1-4, on the basis of embodiment 1-2, adopting single chip circuit with 330V voltage, said main control module 8 is example, and the anti-humorous under-voltage device for under-voltage releasing equipment major part execution mode that is applicable to three phase mains of multi-frequency that involves is described.
Line voltage connects 1 two inputs of said rectification circuit behind the EMC bidirectional filtering.The anode of said rectification circuit 1 is defined as (VH), negativing ending grounding (GND).
After powering on; Said rectification circuit 1 is dc pulse moving voltage SP with ac voltage rectifier; Charge to said strong startup capacitor C 1 through said isolating diode D1; Charging voltage VH is input ac voltage
doubly (80% effective value approximates 430V).The voltage sample circuit 5 that this charging voltage has R1 and R2 to be composed in series, production sampled signal SH sends into single-chip microcomputer.Voltage VH supplies power to reduction voltage circuit.
The 12V (15V) that said reduction voltage circuit 2 produces supplies said switching circuit 7 and said relay 4 to use, and the 5V of generation (3.3V) supplies single chip circuit to use, and the VO of generation (30V) is connected to the anode of said diode D2.The negative electrode of said diode D2 connects an end of said electromagnet coil 3, and is labeled as VP.
Said main control module 8 interrupts the output voltage SA from the first line voltage detection module 6a through rising edge (or trailing edge); The output voltage SB of the second line voltage detection module 6b; Obtain electrical network cycle time (frequency), and the SA several times of in one-period, sampling, methods such as FFT used; Calculate " effective value " of corresponding grid line voltage; According to effective value, judgement was greater than 80% o'clock of nominal voltage (rated voltage), and said single chip circuit judges further whether voltage VH has reached certain value (as greater than 430V) simultaneously.When these two conditions all satisfy; Said single chip circuit control relay make contact is 1.-2.; For said electromagnet coil 3 provides a high starting resistor; After the time-delay (100ms), said single chip circuit is controlled said switching circuit 2 and is connected said electromagnet coil 3, and said electromagnet coil 3 has been realized strong startup.After strong startup is accomplished, continue time-delay (100ms), 1. said single chip circuit controls said relay 4 break contacts-and 2., voltage VP keeps said electromagnet coil 3 certain moments.When effective value less than nominal voltage 50% the time; Said single chip circuit is controlled the electric current that said switching circuit 2 breaks off said electromagnet coil 3; Said electromagnet coil 3 inner back-moving springs eject armature, and armature backs down the circuit breaker self-locking mechanism, realizes the separating brake of circuit breaker.
Single chip circuit comprises the auxiliary circuit of toggle switch, is needing the occasion of delayed releasing, and different toggle switch combinations is set, and after single-chip microcomputer reads this signal, confirms the delay time of delayed releasing.Like three binary-coded decimal toggle switchs, the representative time-delay is 0 second, 1 second, 2 seconds, 3 seconds, 4 seconds, 5 seconds, 10 seconds, 20 seconds respectively, or other time value.Wherein time-delay expression (not delaying time) " instantaneous disconnection " in 0 second, 10 stopwatches show when input voltage less than Ue 50% after, the disconnection again after 10 seconds of delaying time.
In order to further specify the operation principle of phase voltage detection module, the execution mode of three-phase device for under-voltage releasing equipment key link is described.
Suppose between first line voltage detection module 6a connection and the A-B.Resistance R 3 one ends are connected in the A phase, and the other end is connected in the input of the second rectifier bridge B2.Another input termination B phase of the said second rectifier bridge B2.The anode of the said photoelectrical coupler 6-2 of the positive termination input of said second rectifier bridge B2 output, the negative terminal of said second rectifier bridge B2 output connects the negative electrode of said photoelectrical coupler 6-2 input.The collector electrode of said photoelectrical coupler 6-2 output meets 5V, emitter connecting resistance R4, and be connected to single-chip microcomputer.The other end ground connection of R4.Said photoelectrical coupler 6-2 can be a precision photoelectric coupler, is the photoelectrical coupler of monotonic function like transfer characteristics such as PC817.
The present invention the magnitude of voltage of re-detection " adhesive " and " discharging (dropout) " 2 points, through choosing the resistance value of suitable R 3, R4, can make said photoelectrical coupler 6-2 keep linear, to satisfy the accurately needs of detection of voltage, sees Fig. 4.When supposing that input voltage is 50% Ue, output voltage SA is 1V, corresponding a point; When supposing that input voltage is 80% Ue, output voltage SA is 3.8V, corresponding b point.Then this simple isolation detection circuit has satisfied undervoltage tripping fully and has detected requirement.In addition, when the phase failure took place, output voltage SA was 0V, and single-chip microcomputer also can easily be told the whether phase failure.
Embodiment 4
On the basis of embodiment 1-3, said main control module 8, its " effective value " method of resolving corresponding line voltage is; Obtain sampled voltage SA, SB respectively through said first, second line voltage detection module, open rising edge of said main control module or trailing edge interrupt, and obtain the frequency of SA, SB signal correspondence; Thereby obtain the cycle of line voltage, and in one-period, with cycle time divided by 32; Obtain the sampling time, (for example, mains frequency 50Hz; Be 20ms cycle time, after full-wave rectification, is divided into 2 positive half waves, and each positive half wave cycle is 10ms.10ms/32==0.3125ms=312us), by carrying out the pointwise sampling this blanking time, form 32 database.
Can further calculate " effective value " of concrete corresponding grid line voltage through following two methods:
Method one, employing fft algorithm (Fourier algorithm) with 32 point data bases " extraction " primary waves (first-harmonic), judge whether greater than 80% with first-harmonic; This algorithm is to anti-interference back complicated wave form, and especially the serious waveform that disturbs of antagonism is satisfactory for result.
Method two, employing effective value algorithm; Promptly
wherein ui be the instantaneous value of input ac voltage, this loss value can compensate with the sampled signal that is input to said main control module 8 and obtain; The not serious waveform (the THD total harmonic distortion is less than 15%) of high order harmonic component is done in this algorithm antagonism, and is satisfactory for result.
See Fig. 1-2, on the basis of embodiment 1-4, a kind of anti-harmonic wave, multi-frequency and be applicable to the method for work of the device for under-voltage releasing equipment of three phase mains comprise:
1. after said device for under-voltage releasing equipment inserted three phase mains, said main control module 8 detected and calculates the effective value of each line voltage of said three phase mains through line voltage detection module 6;
2. when described each line voltage reach simultaneously described rated voltage Ue 80% after; The output voltage of 8 pairs of said rectification circuits 1 of said main control module carries out sample acquisitions; When if this output voltage reaches the magnitude of voltage of said strong startup; Normally opened contact between the output that is connected in said rectification circuit 1 of said main control module 8 first control relays 4 and the current input terminal of electromagnet coil 3 is closed; Control switching circuit 7 conductings that link to each other with the current output terminal of said electromagnet coil 3 again, so that said electromagnet coil 3 must be electric, i.e. armature adhesive;
Then, control said normally opened contact and break off, promptly only the voltage of keeping said armature adhesive is provided by said reduction voltage circuit 2;
3. when arbitrary line voltage be lower than described rated voltage Ue 50% the time, the said switching circuit 7 of said main control module 8 controls breaks off so that said electromagnet coil 3 dead electricity, promptly armature ejects.
Judge the method that said electromagnet coil 3 inserts, comprising:
A: when said line voltage just often, if when said sampling voltage is not equal to the said magnitude of voltage of keeping the armature adhesive, then said main control module 8 control switch circuit 7 break off;
B: when said sampling voltage returns to the magnitude of voltage of said strong startup, then said main control module 6 produces said switching circuit 7 conductings of a control, to detect the pulse signal whether said electromagnet coil 3 inserts;
C: when said sampling voltage descends, judge that then said electromagnet coil 3 has inserted, wait for when said sampling voltage arrives the magnitude of voltage of said strong startup that 6 of said main control modules are controlled said switching circuit 2 conductings so that said electromagnet coil 3 gets.
Obviously, the foregoing description only be for clearly the present invention is described and is done for example, and be not to be qualification to execution mode of the present invention.For the those of ordinary skill in affiliated field, on the basis of above-mentioned explanation, can also make other multi-form variation or change.Here need not also can't give exhaustive to all execution modes.And these belong to conspicuous variation or the change that spirit of the present invention extended out and still are among protection scope of the present invention.
Claims (10)
1. device for under-voltage releasing equipment comprises: electromagnet coil (3), by the armature of said electromagnet coil (3) control; It is characterized in that also comprising:
Rectification circuit (1), its input links to each other with arbitrary line voltage in the three phase mains;
Reduction voltage circuit (2), its input links to each other with the positive output end of said rectification circuit (1), its output links to each other with the current input terminal of said electromagnet coil (3), is used to provide the voltage of keeping the armature adhesive;
Relay (4), one of which links to each other with the output of said rectification circuit (1) and the current input terminal of said electromagnet coil (3) respectively to normally opened contact;
Switching circuit (7), the current output terminal of said electromagnet coil (3) links to each other with the input of this switching circuit (7);
The line voltage detection module is located at the output of said three phase mains, is used for detecting at least two group line voltages;
Sample circuit (5) is used to detect the output voltage of said rectification circuit (1);
Main control module (8); Store rated voltage Ue and the strong magnitude of voltage that starts; The output voltage that is used to gather said each line voltage detection module (6) to be calculating each line voltage effective value of said three phase mains, and when each line voltage effective value of said three phase mains reaches 80% of rated voltage Ue simultaneously, and the sampling voltage of sample circuit (5) is when reaching the magnitude of voltage of said strong startup; The said normally opened contact of control is closed earlier; The conducting of back control said switching circuit (7), treat said armature adhesive after, control said normally opened contact again and break off; If arbitrary line voltage effective value is lower than at 50% o'clock of rated voltage Ue, then controls said switching circuit (7) and break off.
2. device for under-voltage releasing equipment according to claim 1; It is characterized in that: said main control module (8) also is used for: according to the rise of output voltage of gathering said each line voltage detection module along or trailing edge obtain the frequency or the cycle of the line voltage of said three phase mains, to calculate each line voltage effective value of said three phase mains.
3. device for under-voltage releasing equipment according to claim 2 is characterized in that: establish a decompression capacitor CK and EMC power-supply filter at the input of said rectification circuit (1).
4. according to the arbitrary described device for under-voltage releasing equipment of claim 1-3, it is characterized in that: establish the last one at the output of said rectification circuit (1) and start capacitor C 1.
5. device for under-voltage releasing equipment according to claim 1; It is characterized in that: said line voltage detection module (6); Comprise: the reduction voltage circuit (6-1) that links to each other with line voltage; The photoelectrical coupler (6-2) that links to each other with the reduction voltage circuit output, the output of said photoelectric coupled circuit (6-2) links to each other with said main control module (8).
6. device for under-voltage releasing equipment according to claim 1 is characterized in that: said reduction voltage circuit also provides the working power of said main control module, switching circuit, relay.
7. device for under-voltage releasing equipment according to claim 1 is characterized in that: said main control module (8) is a single chip circuit, and it comprises: said switching circuit (7) the time-delay BCD toggle switch of opening time is controlled in the setting that is suitable for that links to each other with single-chip microcomputer.
8. device for under-voltage releasing equipment according to claim 1; It is characterized in that: said device for under-voltage releasing equipment also comprises; One diode (D2), the anode of said diode (D2) links to each other with the output of said reduction voltage circuit (2), and its negative electrode links to each other with said electromagnet coil (3) input.
9. the method for work of a device for under-voltage releasing equipment as claimed in claim 1 comprises:
1. after said device for under-voltage releasing equipment inserted three phase mains, said main control module (8) detected and calculates the effective value of each line voltage of said three phase mains through line voltage detection module (6);
2. when described each line voltage reach simultaneously described rated voltage Ue 80% after; Said main control module (8) carries out sample acquisitions to the output voltage of said rectification circuit (1); When if this output voltage reaches the magnitude of voltage of said strong startup; Normally opened contact between the output that is connected in said rectification circuit (1) of the first control relay of said main control module (8) (4) and the current input terminal of electromagnet coil (3) is closed; Control switching circuit (7) conducting that links to each other with the current output terminal of said electromagnet coil (3) again, so that said electromagnet coil (3) must be electric, i.e. armature adhesive;
Then, control said normally opened contact and break off, promptly only the voltage of keeping said armature adhesive is provided by said reduction voltage circuit (2);
3. when arbitrary line voltage be lower than described rated voltage Ue 50% the time, said main control module (8) is controlled said switching circuit (7) and is broken off so that said electromagnet coil (3) dead electricity, promptly armature ejects.
10. the method for work of device for under-voltage releasing equipment according to claim 9 also comprises: judge the method that said electromagnet coil (3) inserts, comprising:
A: when said line voltage just often, if when said sampling voltage is not equal to the said magnitude of voltage of keeping the armature adhesive, then said main control module (8) control switch circuit (7) breaks off;
B: when said sampling voltage returns to the magnitude of voltage of said strong startup, then said main control module (6) produces control said switching circuit (a 7) conducting, to detect the pulse signal whether said electromagnet coil (3) inserts;
C: when said sampling voltage descends; Judge that then said electromagnet coil (3) inserts; Wait for when said sampling voltage arrives the magnitude of voltage of said strong startup that said main control module (6) is then controlled (2) conducting of said switching circuit so that said electromagnet coil (3) gets.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410683268.XA CN104377645B (en) | 2012-07-02 | 2012-07-02 | Low-power consumption device for under-voltage releasing equipment |
| CN201410684888.5A CN104377094B (en) | 2012-07-02 | 2012-07-02 | A kind of low-power consumption device for under-voltage releasing equipment |
| CN201210227665.7A CN102768924B (en) | 2012-07-02 | 2012-07-02 | Undervoltage tripper with low power consumption and applicable to three-phase supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210227665.7A CN102768924B (en) | 2012-07-02 | 2012-07-02 | Undervoltage tripper with low power consumption and applicable to three-phase supply |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410683268.XA Division CN104377645B (en) | 2012-07-02 | 2012-07-02 | Low-power consumption device for under-voltage releasing equipment |
| CN201410684888.5A Division CN104377094B (en) | 2012-07-02 | 2012-07-02 | A kind of low-power consumption device for under-voltage releasing equipment |
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| Publication Number | Publication Date |
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| CN102768924A true CN102768924A (en) | 2012-11-07 |
| CN102768924B CN102768924B (en) | 2014-12-17 |
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| CN201210227665.7A Expired - Fee Related CN102768924B (en) | 2012-07-02 | 2012-07-02 | Undervoltage tripper with low power consumption and applicable to three-phase supply |
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| CN111640604A (en) * | 2020-05-28 | 2020-09-08 | 新驰电气集团有限公司 | Low-power-consumption control and protection switching device |
| CN113985107A (en) * | 2021-11-23 | 2022-01-28 | 珠海格力电器股份有限公司 | Voltage detection method and device and readable storage medium |
| CN117434333A (en) * | 2023-12-01 | 2024-01-23 | 深圳智芯微电子科技有限公司 | Micro-grid line voltage abnormality detection circuit, energy management system and electric equipment |
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| CN102768924B (en) | 2014-12-17 |
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