CN104377645A - Low-power-consumption undervoltage tripper - Google Patents
Low-power-consumption undervoltage tripper Download PDFInfo
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- CN104377645A CN104377645A CN201410683268.XA CN201410683268A CN104377645A CN 104377645 A CN104377645 A CN 104377645A CN 201410683268 A CN201410683268 A CN 201410683268A CN 104377645 A CN104377645 A CN 104377645A
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Abstract
The invention relates to a low-power-consumption undervoltage tripper. The low-power-consumption undervoltage tripper comprises an electromagnet coil, an armature, a rectifying circuit, a step-down circuit, a relay, line voltage detection modules, a sampling circuit and a master control module. A nominal voltage Ue and a forced start voltage value are stored in the master control module, and the master control module is used for collecting the output voltage and the voltage period of each line voltage detection module so as to work out the effective value of each line voltage of a three-phase supply; when the effective values of all the line voltages of the three-phase supply reach 80% of the nominal voltage Ue at the same time and the sampling voltage of the sampling circuit reaches the forced start voltage value, the master control module controls a normally open contact to be closed and then controls a switching circuit to be closed, and after the armature is attracted, the master control module controls the normally open contact to be opened; if the effective value of any line voltage is lower than 50% of the nominal voltage Ue, the master control module controls the switching circuit to be opened.
Description
The application is application number is 201210227665.7, and the applying date is on July 2nd, 2012, and invention and created name is the divisional application of the application for a patent for invention of " a kind of low-power consumption and be applicable to the device for under-voltage releasing equipment of three phase mains ".
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 circuit breaker, especially one of the critical elements of frame-type circuit breaker.Under-voltage release is when its terminal voltage is down to a certain prescribed limit, make a kind of release that circuit breaker has time delay or disconnects without time delay, when supply voltage declines (even slowly declining) in 70% to 35% scope of rated operational voltage, under-voltage release answers action (trip coil dead electricity, in coil, moving armature has back-moving spring to eject-thread off), under-voltage release is when supply voltage equals 35% of release rated operational 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 ensure that reliably closed (trip coil obtains electric circuit breaker, in coil, moving armature has coil electromagnetic force to overcome spring force to suck and keep certain moment-" adhesive ", providing condition for circuit breaker reliably closes a floodgate).The essence of undervoltage tripping, be prevent circuit breaker subordinate electric equipment be operated in electric current under under-voltage condition excessive after, the effective measures that electric equipment self-heating increases the weight of.
With reference to mentioned above principle, existing device for under-voltage releasing equipment, be single phase poaer supply working method mostly.The device for under-voltage releasing equipment of the integration in three-phase circuit, yet there are no comparatively ripe device for under-voltage releasing equipment scheme and product occurs.
And existing device for under-voltage releasing equipment, circuit design is comparatively simple or imperfection mostly, and at the occasion that interference is comparatively serious, the circuit breaker especially near intermediate frequency use occasion, device for under-voltage releasing equipment wherein is usually subject to intermediate frequency and disturbs and misoperation.Or in the occasion of marine generator frequency change, because frequency change causes device for under-voltage releasing equipment misoperation.The misoperation of device for under-voltage releasing equipment, causes the mistake separating brake of circuit breaker.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of startup fast, the device for under-voltage releasing equipment being applicable to three phase mains of low-power consumption.
For solving the problems of the technologies described above, the invention provides a kind of low-power consumption and being applicable to the device for under-voltage releasing equipment of three phase mains, comprising: electromagnet coil, the armature controlled by described electromagnet coil; Rectification circuit, its input is connected with the arbitrary line voltage in three phase mains; Reduction voltage circuit, its input is connected with the positive output end of described rectification circuit, its output is connected with the current input terminal of described electromagnet coil, for providing the voltage maintaining armature adhesive; Relay, its a pair normally opened contact is connected with the current input terminal of described electromagnet coil with the output of described rectification circuit respectively; Switching circuit, the current output terminal of described electromagnet coil is connected with the input of this switching circuit; Line voltage detection module, is located at the output of described three phase mains, for detecting at least two group line voltages; Sample circuit, for detecting the output voltage of described rectification circuit; Main control module, store rated voltage Ue and the strong magnitude of voltage started, for gathering the output voltage of described each line voltage detection module to calculate each line voltage effective word of described three phase mains, when each line voltage effective value of described 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 described strong startup, first control described normally opened contact to close, the described switching circuit conducting of rear control, after described armature adhesive, then control the disconnection of described normally opened contact; If arbitrary line voltage effective value lower than rated voltage Ue 50% time, then control described switching circuit disconnect.
Further, described main control module also for the frequency or the cycle that obtain the line voltage of described three phase mains according to the rising edge of output voltage or trailing edge that gather described each line voltage detection module, to calculate each line voltage effective value of described three phase mains.The present invention is first by magnitude of voltage and the cycle of the sampling of described main control module detection line voltage detection module road output, to obtain the voltage effective value of line accurately of outer net (i.e. three phase mains), can judge whether the effective value of the line voltage of outer net reaches 80% of rated voltage Ue more accurately, so this release is also applicable to the occasion applying to different frequency very much, be particularly suitable for the alternating voltage that frequency is 20Hz ~ 65Hz.So second technical problem can also be solved be to provide a kind of anti-harmonic wave and the device for under-voltage releasing equipment being applicable to multi-frequency three phase mains.
Further, electric current during electromagnet coil short circuit described in order to more effective reduction, avoids circuit burnout, establishes a decompression capacitor CK at the input of described rectification circuit, and the capacitive reactance of described decompression capacitor CK makes short circuit current less.
Further, in order to better avoid the harmonic wave in electrical network to the interference of release, an EMC(electromagnetic compatibility is established at the input of described rectification circuit) power-supply filter.EMC power-supply filter, have another name called " Electro Magnetic Compatibility filter ", be mainly used in instrument and meter, automation control system, be used for suppressing and eliminate the strong electromagnetic at industrial automation system scene and electric spark interference, proofread and correct field instrumentation instrument, ensure the safe and reliable operation of automation control system
Further, in order to make described solenoid obtain high pressure, establish the last one start-up capacitance C1 at described reduction voltage circuit input, charging voltage is input ac voltage
doubly (being about 3 ~ 5 times of electromagnet coil rated operational voltage).Moment connected by switching circuit, and on storage capacitor C1, electric charge is all discharged by solenoid, reaches the object of " starting by force " adhesive.
In order to avoid peripheral electrical network is to the interference of weak electric signal, described line voltage detection module, comprising: the reduction voltage circuit be connected with line voltage, the photoelectrical coupler be connected with reduction voltage circuit output, and the output of described photoelectric coupled circuit is connected with described main control module.
Described main control module can be the single-chip microcomputer (MCU) of any model, SOC (system on a chip) (SOC), CPLD, FPGA or ARM and DSP.
Further, in order to need the occasion of delayed releasing to use, described main control module is being a single chip circuit, and it comprises: the BCD toggle switch being suitable for the opening time of switching circuit time delay described in setup control be connected with single-chip microcomputer.
Further, the power unit of described main control module, switching circuit, relay is all provided by described reduction voltage circuit.
Further, in order to prevent pouring in down a chimney of VH voltage, described normally opened contact is stoped to disconnect the back-emf of moment described electromagnet coil generation, protection reduction voltage circuit on the other hand.Described device for under-voltage releasing equipment also comprises, a diode D2, and the anode of described diode D2 is connected with the output of described reduction voltage circuit, and its negative electrode is connected with described electromagnet coil input.
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, comprising:
1. when after described device for under-voltage releasing equipment access three phase mains, described main control module is detected by line voltage detection module and calculates the effective value of each line voltage of described three phase mains;
2. after described each line voltage reaches 80% of described rated voltage Ue simultaneously, described main control module carries out sample acquisitions to the output voltage of described rectification circuit, if when this output voltage reaches the magnitude of voltage of described strong startup, normally opened contact between the output being connected to described rectification circuit of the first control relay of described main control module and the current input terminal of electromagnet coil closes, control the switching circuit conducting be connected with the current output terminal of described electromagnet coil again, electric to make described electromagnet coil obtain, i.e. armature adhesive;
Then, control described normally opened contact and disconnect, namely only provide by described reduction voltage circuit the voltage maintaining described armature adhesive;
3. when arbitrary line voltage lower than described rated voltage Ue 50% time, described in described master control module controls switching circuit disconnect, to make described electromagnet coil dead electricity, namely armature eject.
Further, judge to comprise the method that described electromagnet coil accesses:
A: when described line voltage is normal, if when described sampling voltage is not equal to the magnitude of voltage of described maintenance armature adhesive, then described master control module controls switching circuit disconnects;
B: when described sampling voltage returns to the magnitude of voltage of described strong startup, then described main control module produces one and controls described switching circuit conducting, to detect the pulse signal whether described electromagnet coil accesses;
C: when described sampling voltage declines, then judge that described electromagnet coil accesses, and when waiting for described sampling voltage to the magnitude of voltage of described strong startup, it is electric to make described electromagnet coil obtain that described main control module then controls described switching circuit conducting.
The present invention has the following advantages: (1) carries out startup by reduction voltage circuit control relay and ME for maintenance switches, and overcomes the problem that when existing device for under-voltage releasing equipment normally works, coil heating amount is large; By the strong start-up capacitance C1 of access, overcome staring torque little, often have not adhesive phenomenon and make circuit design simple; (2) by line voltage detection module, detect two groups of line voltages simultaneously, obtain the magnitude of voltage of three phase lines, and judge whether input voltage reaches 80% of rated voltage by single-chip microcomputer, making release work in three phase mains by detecting strong starting resistor, solving the technical problem that existing device for under-voltage releasing equipment can not work etc. under three phase mains; (3) adopt single-chip microcomputer to carry out under-voltage control, can power consumption be effectively reduced; (4) the line voltage detection module adopted, it realizes the collection of SA, SB signal by photoelectric coupling, and circuit is simple, and isolation effect is good; (5) by single-chip microcomputer and line voltage detection module to the detection of mains frequency, obtain effective value accurately further, the rated voltage that armature adhesive reaches enough can be ensured, and widened the use occasion of release; (6) effectively can remove the interference of harmonic wave in electrical network to the collection of mains frequency, coordinate with EMC bidirectional filtering power-supply filter, more effectively can avoid the humorous wave interference in electrical network.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below basis specific embodiment and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is anti-harmonic wave of the present invention and multi-frequency and is applicable to the circuit theory diagrams of the device for under-voltage releasing equipment of three phase mains;
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 described photoelectrical coupler of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail:
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 define device for under-voltage releasing equipment.Under the requirement of this standard, exemplify following examples and be described.
Embodiment 1
See Fig. 1-2, a kind of device for under-voltage releasing equipment, comprising: electromagnet coil 3, the armature controlled by described electromagnet coil 3; Rectification circuit 1, its input is connected with the arbitrary line voltage in three phase mains; Reduction voltage circuit 2, its input is connected with the positive output end of described rectification circuit 1, its output is connected with the current input terminal of described electromagnet coil 3, for providing the voltage maintaining armature adhesive; Relay 4, its a pair normally opened contact is connected with the current input terminal of described electromagnet coil 3 with the output of described rectification circuit 1 respectively; Switching circuit 7, the current output terminal of described electromagnet coil 3 is connected with the input of this switching circuit 7; Line voltage detection module, is located at the output of described three phase mains, for detecting at least two group line voltages; Sample circuit 5, for detecting the output voltage of described rectification circuit 1; Main control module 8, store rated voltage Ue and the strong magnitude of voltage started, for gathering the output voltage of described each line voltage detection module 6 to calculate each line voltage effective value of described three phase mains, when each line voltage effective value of described 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 described strong startup, first control described normally opened contact to close, the conducting of rear control described switching circuit 7, after described armature adhesive, then control the disconnection of described normally opened contact; If arbitrary line voltage effective value lower than rated voltage Ue 50% time, then control described switching circuit 7 and disconnect.Described main control module 8 also for the frequency or the cycle that obtain the line voltage of described three phase mains according to the rising edge of output voltage or trailing edge that gather described each line voltage detection module, to calculate each line voltage effective value of described three phase mains.Concrete grammar is: described main control module opens the rising edge and the trailing edge that interrupt exporting SA, SB signal with detection line voltage detection module road, to obtain cycle or the frequency of line voltage, and carry out with the magnitude of voltage of the sampling of line voltage detection module road output the voltage effective value of line accurately calculating to obtain outer net, can judge whether the effective value of outer net voltage reaches 80% of rated voltage Ue more accurately, so this release is also applicable to the occasion applying to different frequency very much, be particularly suitable for the alternating voltage that frequency is 20Hz ~ 65Hz.
A decompression capacitor CK and EMC power-supply filter is established at the input of described rectification circuit 1.
The last one start-up capacitance C1 is established at the output of described rectification circuit 1.
Described line voltage detection module, comprising: the reduction voltage circuit 6-1 be connected with line voltage, and the output of the photoelectrical coupler 6-2 be connected with reduction voltage circuit output, described photoelectric coupled circuit 6-2 is connected with described main control module 8.
Described line voltage detection module, can also adopt rectification circuit to be connected with a bleeder circuit, sample from a point pressure side, keeps the linear relationship of sampling voltage.
Described reduction voltage circuit also provides the working power of described main control module, switching circuit, relay.
Described main control module 8 is a single chip circuit, and it comprises: the BCD toggle switch being suitable for the opening time of switching circuit 7 time delay described in setup control be connected with single-chip microcomputer.
Described 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, after described rectification circuit 1, forms all-wave pulsating voltage VH and charges to described strong start-up capacitance C1.Power to after VH voltage has reduction voltage circuit 2 step-down described main control module 8, provide power supply to described relay 4 and switching circuit 2 simultaneously, described reduction voltage circuit 2 coating-forming voltage VO voltage VP after diode D2 isolates is that described electromagnet coil 3 is powered.Resistance R1 and R2 forms the sampling circuit of VH, and sampled signal SH send described main control module 8.
Wherein said line voltage detection module comprises: connect the First Line voltage detection module 6a between any two line voltages and the second line voltage detection module 6b respectively; Described main control module 8 interrupts the output voltage SA from First Line voltage detection module (6a) by rising edge (or trailing edge), the output voltage SB of the second line voltage detection module (6b), obtain the grid cycle time (frequency), and SA several times of sampling in one-period, the methods such as application FFT, calculate " effective value " of corresponding grid line voltage, according to effective value, when judging to be greater than 80% of nominal voltage (rated voltage), described main control module 8 judges whether voltage VH reaches certain value simultaneously further.When these two conditions all meet, described main control module 8 control relay make contact is 1.-2., for described electromagnet coil 3 provides a high starting resistor, then, described main control module 8 controls described switching circuit 2 and connects described electromagnet coil 3, and described electromagnet coil 3 achieves strong startup.After strong startup completes, 1. described main control module 8 controls described relay 4 break contact-and 2., voltage VP maintains the certain moment of described electromagnet coil 3.When effective value is less than 50% of nominal voltage, described main control module 8 controls the electric current that described switching circuit 2 disconnects described electromagnet coil 3, armature ejects by the back-moving spring of described electromagnet coil 3 inside, and armature backs down circuit breaker self-locking mechanism, realizes the separating brake of circuit breaker.
Isolating diode D1 is set after full-wave rectification, makes the charging voltage (VH) on described strong start-up capacitance C1, do not affect the information of electrical network pulsating voltage (SP).For resolving line voltage cycle, harmonic wave, provide conveniently.
In the present invention, the leading make contact of described relay 4 1.-2., the starting resistor of described electromagnet coil 3, is the charging voltage (VH) of described strong start-up capacitance C1, for input ac voltage
doubly (several times for described electromagnet coil 3 rated operational voltage).Moment connected by described switching circuit 2, and on described strong start-up capacitance C1, electric charge is all discharged by described electromagnet coil 3, reaches the object of " starting by force " adhesive.The power of strong startup, described strong start-up capacitance C1 capacity, except meeting reduction voltage circuit minimum requirements, can also be optimized by the capacitance suitably strengthening described strong start-up capacitance C1 further.
In the present invention, the current input terminal of described electromagnet coil 3 is fixedly connected with voltage VP in advance, prevents contact 1.-and the 2. transition period, described electromagnet coil 3 loses voltage and disconnects voluntarily.After described electromagnet coil the last 3 starts, maintained the prime power of described electromagnet coil 3 by voltage VP, meet the requirement of described electromagnet coil 3 low power run, both achieved high-torque and started, make again the overall caloric value of device for under-voltage releasing equipment little, its circuit structure is simple.
In the present invention; the output voltage VO of reduction voltage circuit 2 forms VP and powers to described electromagnet coil 3 after described diode D2 isolates; described diode D2 mono-aspect prevents pouring in down a chimney of VH voltage; stop contact 1. on the other hand-2. disconnect the back-emf of moment described electromagnet coil 3 generation, protection reduction voltage circuit.
In the present invention, input voltage is through full-wave rectification, and described isolating diode D1 isolates backward described strong startup C1 and charges, and has generation 5V, 12V and VO voltage of reduction voltage circuit.These three groups of voltages, have nothing to do with the frequency of input voltage, harmonic wave.
In the present invention, the grid cycle (frequency) that described main control module 8 is obtained by line voltage detection module, accurately resolve the effective value that SA, SB calculated signals goes out grid line voltage, effective value is corresponding with the cycle.According to effective value, when judging to be greater than 80% of nominal voltage, described main control module 8 judges whether VH reaches certain value simultaneously further.When these two conditions all meet, 1. described main control module 8 controls described relay 4 make contact-2., for described electromagnet coil 3 provides a high starting resistor, then, described main control module 8 controls described switching circuit 2 and connects described electromagnet coil 3, described electromagnet coil 3 achieves strong startup, ensure that absolutely adhesive.
Embodiment 3
See Fig. 1-4, on the basis of embodiment 1-2, adopt single chip circuit for 330V voltage, described main control module 8, illustrate and anti-humorously involve the under-voltage device for under-voltage releasing equipment major part execution mode being applicable to three phase mains of multi-frequency.
Line voltage connects described rectification circuit 1 two inputs after EMC bidirectional filtering.The anode of described rectification circuit 1 is defined as (VH), negativing ending grounding (GND).
After powering on, ac voltage rectifier is DC pulse moving voltage SP by described rectification circuit 1, charge to described strong start-up capacitance C1 through described isolating diode D1, and charging voltage VH is input ac voltage
doubly (effective value of 80%, approximates 430V).This charged electrical is pressed with the voltage sample circuit 5 that R1 and R2 is composed in series, and production sampled signal SH sends into single-chip microcomputer.Voltage VH powers to reduction voltage circuit.
The 12V(15V that described reduction voltage circuit 2 produces) for described switching circuit 7 and described relay 4, the 5V(3.3V of generation) for single chip circuit, the VO(30V of generation) be connected to the anode of described diode D2.The negative electrode of described diode D2 connects one end of described electromagnet coil 3, and is labeled as VP.
Described main control module 8 interrupts the output voltage SA from First Line voltage detection module 6a by rising edge (or trailing edge), the output voltage SB of the second line voltage detection module 6b, obtain the grid cycle time (frequency), and SA several times of sampling in one-period, the methods such as application FFT, calculate " effective value " of corresponding grid line voltage, according to effective value, when judging to be greater than 80% of nominal voltage (rated voltage), described single chip circuit judges whether voltage VH reaches certain value (as being greater than 430V) simultaneously further.When these two conditions all meet, described single chip circuit control relay make contact is 1.-2., for described electromagnet coil 3 provides a high starting resistor, after time delay (100ms), described single chip circuit controls described switching circuit 2 and connects described electromagnet coil 3, and described electromagnet coil 3 achieves strong startup.After strong startup completes, continue time delay (100ms), 1. described single chip circuit controls described relay 4 break contact-and 2., voltage VP maintains the certain moment of described electromagnet coil 3.When effective value is less than 50% of nominal voltage, described single chip circuit controls the electric current that described switching circuit 2 disconnects described electromagnet coil 3, armature ejects by the back-moving spring of described electromagnet coil 3 inside, and armature backs down 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, arranges different toggle switch combinations, after single-chip microcomputer reads this signal, determines the delay time of delayed releasing.As three binary-coded decimal toggle switchs, represent time delay respectively 0 second, 1 second, 2 seconds, 3 seconds, 4 seconds, 5 seconds, 10 seconds, 20 seconds, or other time value.Wherein time delay in 0 second represents (not time delay) " instantaneous disconnection ", and 10 stopwatches show that, after input voltage is less than 50% of Ue, time delay disconnects after 10 seconds again.
In order to further illustrate the operation principle of phase-voltage measurement module, the execution mode of three-phase device for under-voltage releasing equipment key link is described.
Suppose that First Line voltage detection module 6a connects between A-B.Resistance R3 one end is connected to A phase, and the other end is connected to an input of the second rectifier bridge B2.Another input termination B phase of described second rectifier bridge B2.The anode of photoelectrical coupler 6-2 input described in the positive termination that described second rectifier bridge B2 exports, the negative terminal that described second rectifier bridge B2 exports connects the negative electrode of described photoelectrical coupler 6-2 input.The collector electrode of described photoelectrical coupler 6-2 output meets 5V, emitter connecting resistance R4, and is connected to single-chip microcomputer.The other end ground connection of R4.Described photoelectrical coupler 6-2 can be precision photoelectric coupler, if the transfer characteristics such as PC817 are the photoelectrical coupler of monotonic function.
The present invention re-detection " adhesive " and the magnitude of voltage of " discharging (dropout) " 2 points, by choosing the resistance value of suitable R3, R4, described photoelectrical coupler 6-2 can be made to keep linear, to meet the needs that voltage accurately detects, see Fig. 4.When supposing that input voltage is the Ue of 50%, output voltage SA is 1V, corresponding
apoint; When supposing that input voltage is the Ue of 80%, output voltage SA is 3.8V, corresponding
bpoint.Then this simple isolation detection circuit, meets undervoltage tripping testing requirement completely.In addition, when the disconnected phase time of generation, output voltage SA is 0V, and single-chip microcomputer also easily can tell phase of whether breaking.
Embodiment 4
On the basis of embodiment 1-3, described main control module 8, its " effective value " method resolving corresponding line voltage is, sampled voltage SA, SB is obtained respectively by first, second line voltage detection module described, the open rising edge of described main control module or trailing edge interrupt, obtain the frequency that SA, SB signal is corresponding, thus obtain the cycle of line voltage, and in one-period, by cycle time divided by 32, obtain the sampling time, (such as, mains frequency 50Hz, cycle time is 20ms, after full-wave rectification, be divided into 2 positive half waves, each positive half wave cycle is 10ms.10ms/32==0.3125ms=312us), carry out pointwise sampling by this interval time, form the database of 32.
Can be calculated further by following two methods " effective value " of concrete corresponding grid line voltage:
Method one, employing fft algorithm (Fourier algorithm), with 32 point data bases " extraction " primary wave (first-harmonic), judge whether to be greater than 80% with first-harmonic; This algorithm, to anti-interference rear complicated wave form, especially resists the satisfactory for result of the waveform of severe jamming.
Method two, employing rms algorithm, namely
; Wherein ui is the instantaneous value of input ac voltage, and this penalty values can compensate by the sampled signal being input to described main control module 8 and obtain; The waveform (THD total harmonic distortion is less than 15%) that the dry high order harmonic component of this algorithm antagonism is not serious, satisfactory for result.
Embodiment 5
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, comprising:
1. when after described device for under-voltage releasing equipment access three phase mains, described main control module 8 is detected by line voltage detection module 6 and calculates the effective value of each line voltage of described three phase mains;
2. after described each line voltage reaches 80% of described rated voltage Ue simultaneously, the output voltage of described main control module 8 to described rectification circuit 1 carries out sample acquisitions, if when this output voltage reaches the magnitude of voltage of described strong startup, normally opened contact between the output being connected to described rectification circuit 1 of the first control relay of described main control module 84 and the current input terminal of electromagnet coil 3 closes, control switching circuit 7 conducting be connected with the current output terminal of described electromagnet coil 3 again, to make described electromagnet coil 3 obtain electric, i.e. armature adhesive;
Then, control described normally opened contact and disconnect, namely only provide by described reduction voltage circuit 2 voltage maintaining described armature adhesive;
3. when arbitrary line voltage lower than described rated voltage Ue 50% time, described main control module 8 controls described switching circuit 7 and disconnects, to make described electromagnet coil 3 dead electricity, namely armature eject.
Judge to comprise the method that described electromagnet coil 3 accesses:
A: when described line voltage is normal, if when described sampling voltage is not equal to the magnitude of voltage of described maintenance armature adhesive, then described main control module 8 control switch circuit 7 disconnects;
B: when described sampling voltage returns to the magnitude of voltage of described strong startup, then described main control module 6 produces the conducting of a control described switching circuit 7, to detect the pulse signal whether described electromagnet coil 3 accesses;
C: when described sampling voltage declines, then judge that described electromagnet coil 3 accesses, when waiting for described sampling voltage to the magnitude of voltage of described strong startup, described main control module 6 control the conducting of described switching circuit 2 with make described electromagnet coil 3 electric.
Obviously, above-described embodiment is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all execution modes.And these belong to spirit institute's apparent change of extending out of the present invention or change and are still among protection scope of the present invention.
Claims (1)
1. a low-power consumption device for under-voltage releasing equipment, comprising: electromagnet coil (3), the armature controlled by described electromagnet coil (3); Characterized by further comprising:
Rectification circuit (1), its input is connected with the arbitrary line voltage in three phase mains;
Reduction voltage circuit (2), its input is connected with the positive output end of described rectification circuit (1), its output is connected with the current input terminal of described electromagnet coil (3), for providing the voltage maintaining armature adhesive;
Relay (4), its a pair normally opened contact is connected with the current input terminal of described electromagnet coil (3) with the output of described rectification circuit (1) respectively;
Switching circuit (7), the current output terminal of described electromagnet coil (3) is connected with the input of this switching circuit (7);
Line voltage detection module, is located at the output of described three phase mains, for detecting at least two group line voltages;
Sample circuit (5), for detecting the output voltage of described rectification circuit (1);
Main control module (8), store rated voltage Ue and the strong magnitude of voltage started, for gathering the output voltage of described each line voltage detection module (6) to calculate each line voltage effective value of described three phase mains, when each line voltage effective value of described 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 described strong startup, first control described normally opened contact to close, the described switching circuit of rear control (7) conducting, after described armature adhesive, then control the disconnection of described normally opened contact; If arbitrary line voltage effective value lower than rated voltage Ue 50% time, then control described switching circuit (7) disconnect;
Described main control module (8) also for the frequency or the cycle that obtain the line voltage of described three phase mains according to the rising edge of output voltage or trailing edge that gather described each line voltage detection module, to calculate each line voltage effective value of described three phase mains;
A decompression capacitor CK and EMC power-supply filter is established at the input of described rectification circuit (1);
Described device for under-voltage releasing equipment also comprises, a diode (D2), and the anode of described diode (D2) is connected with the output of described reduction voltage circuit (2), and its negative electrode is connected with described electromagnet coil (3) input.
Priority Applications (1)
| 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 |
Applications Claiming Priority (2)
| 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 |
| CN201210227665.7A CN102768924B (en) | 2012-07-02 | 2012-07-02 | Undervoltage tripper with low power consumption and applicable to three-phase supply |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210227665.7A Division CN102768924B (en) | 2012-07-02 | 2012-07-02 | Undervoltage tripper with low power consumption and applicable to three-phase supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104377645A true CN104377645A (en) | 2015-02-25 |
| CN104377645B CN104377645B (en) | 2018-08-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108964455A (en) * | 2017-05-23 | 2018-12-07 | 常熟开关制造有限公司(原常熟开关厂） | A kind of electromagnetic mechanism and its method for controlling power supply |
| US10614985B2 (en) | 2017-01-05 | 2020-04-07 | Lsis Co., Ltd. | 3 phase undervoltage trip device and molded case circuit breaker therewith |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10614985B2 (en) | 2017-01-05 | 2020-04-07 | Lsis Co., Ltd. | 3 phase undervoltage trip device and molded case circuit breaker therewith |
| CN108964455A (en) * | 2017-05-23 | 2018-12-07 | 常熟开关制造有限公司(原常熟开关厂） | A kind of electromagnetic mechanism and its method for controlling power supply |
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| CN104377645B (en) | 2018-08-24 |
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