CN103887115A - Instantaneous power failure preventing delayer - Google Patents
Instantaneous power failure preventing delayer Download PDFInfo
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- CN103887115A CN103887115A CN201410070031.4A CN201410070031A CN103887115A CN 103887115 A CN103887115 A CN 103887115A CN 201410070031 A CN201410070031 A CN 201410070031A CN 103887115 A CN103887115 A CN 103887115A
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Abstract
The invention provides an instantaneous power failure preventing delayer which comprises a filter unit, a rectification energy storage unit, a DC/DC conversion unit, a sampling unit, a single chip microcomputer control unit, a display setting unit and a switching unit. By means of the instantaneous power failure preventing delayer, a instantaneous power failure preventing delayer circuit is started to be adaptive to working voltage of an alternating-current contactor, reliability of full-range start is guaranteed, work of the instantaneous power failure preventing delayer circuit is maintained in the mode that the working voltage is converted to direct-current low voltage, the working mode substantially lowers power consumption of the alternating-current contactor, and energy is saved by more than 80%. When voltage fluctuation or an instantaneous power failure happens, work of the alternating-current contactor is directly maintained in a delayed mode, sectional model selection is not needed, universality is high, the size is small, and cost is low.
Description
Technical field
The present invention relates to a kind of delayer, be specifically related to a kind of voltage shock avoiding delayer.
Background technology
Electric power system is in running, due to thunderbolt, the reason such as electric network fault, main equipment starting of shorted to earth, reclosing prepared auto restart, enterprise outside, inside, the electric network fault causing, this electric network fault makes the phenomenon that voltage instantaneous fluctuates by a relatively large margin or momentary power failure recovers again be called " shaking electric ".
The application of A.C. contactor in low-tension motor control system is very extensive, has accounted for sizable ratio.Due to the operation principle feature of A.C. contactor, in the time that " shaking electric " appears in electrical network, can cause A.C. contactor actuating coil short supply interruption or brownout, be that A.C. contactor discharges, produce the major reason that power-off is shut down.International IEC standard regulation: 80% of rated voltage is the critical reliable pick-up voltage operating characteristics that is electromagnetic AC contactor, so be due to its principle because " shaking electric " causes electromagnetic AC contactor tripping grinder out of hand and natural." shake electric " short a few tens of milliseconds to several seconds; catastrophic to requiring large number quipments not allow the enterprise of motor tripping grinder in continuous production in technological process; the lighter's hundreds of thousands, up to ten million economic loss, serious also can breaking out of fire, blast and even personal safety.
Current existing technology has following two kinds:
The first kind is to start A.C. contactor work with high direct voltage output, uses DC low-voltage maintenance work state after starting.Accumulation of energy mode is electric capacity or battery, and when " shaking electric " or power down, can guarantee holds time is not less than set point.Be characterized in: energy-saving effect is remarkable.But also there is defect: 1,, because working method is to be connected across between input power and A.C. contactor, self breaks down, and original commutation circuit can not be worked, and causes secondary failure.2, be segmented control, there is requirements of type selecting, cause is that this kind of scheme is in the time starting, not with suitable alternating current work, during due to the different A.C. contactor adhesive of watt level, mechanical force is not of uniform size, each manufacturer ac contactor coil D.C. resistance is not quite similar, and therefore the different A.C. contactor of watt level is had to requirements of type selecting.3, wiring complexity (having different loads wire jumper), using adaptability is poor.
Equations of The Second Kind is AC starting, exchanges maintenance work state, in the time voltage fluctuation or " shake electricity " being detected, is switched to direct current pressure side and maintains A.C. contactor and do not thread off, and accumulation of energy mode is electric capacity.Be characterized in: under alternating voltage, work all the time, self has failure detector circuit, and self breaks down, can not affect original commutation circuit and normally work.There is following shortcoming in this technology: 1, owing to being just to keep end-grain cutting to change to direct voltage when voltage fluctuation or " shake electricity " detected, in industry spot due to the continual interference of electrical network, make to switch action too frequent, be easy to contact and mechanical switching device to damage, device damages and lost efficacy.If will detect loop sensitivity, may cause " shaking electric " time, be switched to direct current and keep end time delay, and cause A.C. contactor to keep unsuccessfully, can not guarantee the reliability of work.Be conflict and detect with switching, and field condition is complicated and changeable, limits due to operation principle design, antijamming capability is poor.2, volume is large, and cost is high, not energy-conservation.3, be segmented control, have requirements of type selecting, using adaptability is poor.
Summary of the invention
The present invention, according to the technical problem of above-mentioned existence, provides a kind of voltage shock avoiding delayer, and the commutation circuit that solves above-mentioned existence causes secondary failure and switches the problem of frequent breakage device can not work time.
The solution that the present invention adopts is: a kind of voltage shock avoiding delayer, comprising:
Filter unit, for carrying out the voltage signal after filtering output filtering to the line voltage of access;
Rectification energy-storage units, is connected with the output of filter unit, and filtered voltage signal is carried out to rectification output dc voltage, and carries out the storage of electric energy;
DC/DC converting unit, carries out DC voltage conversion output to the direct voltage of rectification energy-storage units output;
Sampling unit, described sampling unit is arranged on electrical network, and line voltage is sampled and exported;
Single-chip Controlling unit, described Single-chip Controlling unit is connected with DC/DC converting unit, receives the sample information of sampling unit, and exports control information;
Display setting device, is connected with Single-chip Controlling unit, receives the demonstration information that Single-chip Controlling unit sends to, and configuration information is sent to Single-chip Controlling unit;
Switch unit, described switch unit is arranged on A.C. contactor, is connected with the output of Single-chip Controlling unit.
Further, described filter unit adopts EMI(Electro Magnetic Interference, electromagnetic interference) filter unit, mainly formed by common mode choke and filter capacitor, the input of described filter unit is connected with electrical network, by the filter capacitor output on common mode choke and cross-over connection common mode choke.
Further, described rectification energy-storage units comprises rectification circuit and accumulator, and the input of described rectification circuit connects the output of described filter unit, and described accumulator is connected in parallel on the output of described rectification circuit.
Further, described accumulator is electric capacity.
Further, described accumulator is battery charger and storage battery, and the output of described filter unit connects described battery charger, and described battery charger is connected with storage battery.
Further, described DC/DC converting unit converts the high voltage direct current of storage capacitor to maintain A.C. contactor work and the desired corresponding direct voltage of single-chip computer control system work to.
Further, described Single-chip Controlling unit arranges watchdog circuit.
Further, described display setting device comprises display screen and input key, and described display setting device is connected with the output of Single-chip Controlling unit, and described load button is connected with the input of Single-chip Controlling unit.
Further, described sampling unit arranges buffer circuit.
Further, described buffer circuit is any one in transformer isolation or light-coupled isolation.
Advantage of the present invention is: a kind of voltage shock avoiding delayer that the present invention proposes, has overcome the problem that product can not complete series starts, without segmentation type selecting, highly versatile; Solve module self and broken down, can not affect original commutation circuit and normally work, can not cause secondary failure.Improve mode of operation; normal adhesive operating state and the delay protection in the time of voltage fluctuation or " shaking electric " unite two into one; when voltage fluctuation; directly time delay keeps, and without conversion, has greatly improved the reliability of antijamming capability and use; solve detection and switched the unsteadiness in keeping; adopt DC low-voltage to maintain its work, this kind of working method significantly reduced the power consumption of A.C. contactor simultaneously, energy-conservation more than 80%.Small product size is little, and cost is low.
Accompanying drawing explanation
Fig. 1 is the voltage shock avoiding delayer structural representation that the present invention proposes;
Fig. 2 is the voltage shock avoiding delayer practical application winding diagram that the present invention proposes.
Embodiment
Shown in Figure 1, be the voltage shock avoiding delayer structural representation that the present invention proposes.
As shown in Figure 1, a kind of voltage shock avoiding delayer, comprising:
Rectification energy-storage units 2, is connected with the output of filter unit, and filtered voltage signal is carried out to rectification output dc voltage, and carries out the storage of electric energy;
DC/DC converting unit 3, carries out DC voltage conversion output to the direct voltage of rectification energy-storage units output;
Single-chip Controlling unit 5, described Single-chip Controlling unit is connected with DC/DC converting unit, receives the sample information of sampling unit, and exports control information;
In the embodiment of the present invention, by voltage shock avoiding delay circuit, start with adaptive A.C. contactor operating voltage, guarantee the reliability that gamut starts, be converted to DC low-voltage again and maintain its work, this kind of working method significantly reduced the power consumption of A.C. contactor, energy-conservation more than 80%.In the time of voltage fluctuation or " shaking electric ", directly time delay keeps; Without segmentation type selecting, highly versatile; Volume is little, and cost is low.
Further, described filter unit adopts EMI filter unit, is mainly made up of common mode choke and filter capacitor, and the input of described filter unit is connected with electrical network, by the filter capacitor output on common mode choke and cross-over connection common mode choke.
In the embodiment of the present invention, filter unit is that electric network noise is disturbed and carries out filtering, and power supply noise is the one of electromagnetic interference, and the frequency spectrum of its conducted noise is roughly 10KHz～30MHz, reaches as high as 150MHz.EMI filter unit comprises common mode choke (also claiming common mode inductance) L, filter capacitor C.L is inoperative to series mode interference, but in the time there is common mode disturbances, because the flow direction of two coils is identical, after overcoupling, total inductance amount increases rapidly, therefore common-mode signal is presented to very large induction reactance, makes it to be difficult for passing through, and reaches the effect of eliminating electromagnetic interference.Two coils of common mode choke are respectively on the ferrite bead of low-loss, high permeability, and in the time having electric current to pass through, the magnetic field on two coils will be strengthened mutually.Filter capacitor and differential mode inductance play inhibitory action to differential mode interference signal.
Further, described rectification energy-storage units comprises rectification circuit and accumulator, and the input of described rectification circuit connects the output of described filter unit, and described accumulator is connected in parallel on the output of described rectification circuit.
In the embodiment of the present invention, the adhesive that maintains A.C. contactor in the situation that rolling is electric is to adopt the direct current way of output, and control circuit and single-chip microcomputer are to be all operated under DC power supply simultaneously, therefore adopt and convert alternating current input power supplying to direct voltage by rectifying and wave-filtering.
In the situation that rolling is electric, control circuit and A.C. contactor are wanted the time that can work in the several seconds simultaneously.Need in the process of power-off, continue electricity, required energy will store in advance.Adopt accumulator to carry out the supply of electric energy, in the embodiment of the present invention, accumulator can adopt electric capacity, also can adopt storage battery, can also be other circuit or elements that can carry out energy storage, the embodiment of the present invention is not restricted this, can realize this function be as the criterion with those skilled in the art.
Further, described accumulator is electric capacity.
In the embodiment of the present invention, accumulator adopts electric capacity, according to the difference of load object, select the electric capacity of different capabilities, electric capacity value at hundreds of between thousands of microfarads, for special A.C. contactor, in order to meet job requirement, need more jumbo electric capacity to carry out energy storage.
Further, described accumulator is battery charger and storage battery, and the output of described filter unit connects described battery charger, and described battery charger is connected with storage battery.
In the embodiment of the present invention, after adopting storage battery for power-off, provide electric energy, storage battery is connected with the output of filter unit by battery charger, is charge in batteries by electrical network, and not needing additionally increases power supply, and circuit structure is simple.
In the embodiment of the present invention, described DC/DC converting unit is that the high voltage direct current of storage capacitor is converted to and maintains A.C. contactor work and the desired corresponding direct voltage of single-chip computer control system work.For A.C. contactor, under the state of adhesive, most of contactor only need access 10 to 30 volts of direct voltages, provides ten in the situation of hundreds of milliampere electric current, can maintain reliable adhesive operating state.Maintain A.C. contactor work by high voltage direct current being converted to lower direct voltage, reduce the loss of electric energy.To providing power supply with single-chip microcomputer and other operating on low voltage equipment of operating on low voltage, do not need to configure separately power supply simultaneously, reduce circuit.Certainly also to consider the problem that the direct voltage of other auxiliary circuits provides here.
Further, described Single-chip Controlling unit arranges watchdog circuit.
In the embodiment of the present invention, Single-chip Controlling unit is coordinated unit and is carried out work.The single-chip microcomputer that the present invention adopts is mainly considered the antijamming capability of single-chip microcomputer work under industrial environment.By being set, house dog improves the reliability of circuit system, single-chip microcomputer externally drives the different level control of many legs and the monostable mode jointly controlling of adopting simultaneously, guarantee, after single-chip microcomputer damage or program inefficacy, the impact of the tradition control function on contactor to be reduced to minimum.After this delay circuit is impaired, do not affect the normal work of former control circuit.
Described display setting device comprises display screen and input key, and described display setting device is connected with the output of Single-chip Controlling unit, and described load button is connected with the input of Single-chip Controlling unit.
In the embodiment of the present invention, display setting device and single machine unit are one, be used for the operating state of display module, simultaneously under the control of single-chip microcomputer, the workflow of the selection decision module by button and select to shake after electricity, A.C. contactor requires to maintain the time of adhesive, and all settings are stored in single-chip microcomputer.
Further, described sampling unit arranges buffer circuit.
Sampling unit gathers external environment condition and current state, and sends on single-chip microcomputer, and single-chip microcomputer receives the collection signal of sampling unit, and then determines next step workflow.The signal of sampling unit collection comprises: line voltage, the state of contactor control switch, the phase angle of alternating voltage, ambient temperature, empty electric situation etc.
In the process gathering, should guarantee the instantaneity of collection capacity, guarantee again the reliability of signal.Therefore enter for module-external analog acquisition time need to isolate, for isolated outside High-frequency Interference.Isolation method can be realized and being as the criterion with those skilled in the art, and the buffer circuit of sampling unit adopts transformer isolation or light-coupled isolation.
Fig. 2 is the voltage shock avoiding delayer practical application winding diagram that the present invention proposes.
Shown in Figure 2, switch unit is directly connected with A.C. contactor, and A.C. contactor is controlled.Traditional A.C. contactor control connection scheme is that K point is connected with A1 point, increase after delay circuit, switch unit is connected between K point and A1 point, under the control of single-chip microcomputer, A.C. contactor control is switched to direct voltage by switch unit, makes being connected with DC/DC converting unit of A.C. contactor, in the time of single-chip microcomputer damage or fault, switch unit is connected K point with A1 point, get back to initial condition.
The workflow of a kind of voltage shock avoiding delayer provided by the invention is as follows:
1), after initially powering on, A.C. contactor is in traditional connected mode.Alternating current, after first module EMI filtering, is eliminated high-frequency electromagnetic interference noise.
2) by second unit rectifying and wave-filtering, AC-input voltage being converted to high voltage direct current is stored in energy storage device.
3) DC/DC is transformed into high voltage direct current: the 10V-30V direct current that 1. maintains contactor.2. the DC voltage of auxiliary circuit.3. the DC5V of single-chip microcomputer work.
4) now single-chip microcomputer is controlled according to the parameter having arranged.First, whether single-chip microcomputer check system is normal, as undesired, maintains current state.
5) as circuit is normal, check that whether external voltage is normal, namely alternating voltage should be at the more than 80% of normal value.Undesired, wait for normal always.
6) AC-input voltage normal after, check whether A.C. contactor enters operating state.No, wait for.
7) contactor enters after operating state, and short wait, so that contactor is stablized adhesive, is then switched to DC control by contactor.
8) check whether external control switch will disconnect contactor, as cut-off signal detected, single-chip microcomputer disconnects contactor by instruction, jumps to 5.
9) check whether shake electricity, do not jump to 8.
10) carry out time delay according to setup times, after the time arrives, disconnect contactor, jump to 5.
In workflow 8, while checking external switch, check the situation of empty electricity simultaneously.Specifically, in the time that external voltage is normal, switching voltage, more than empty electric switch sill, is considered as not disconnecting.Below empty electric switch sill time, be considered as disconnecting.The setting of empty electric switch sill is depending on on-the-spot circuit situation.
The electric threshold of rolling of the present invention is designed to lower than 20% to 30% of normal voltage, also can be given according to user and actual conditions, and the present invention is not restricted this.
Above a kind of voltage shock avoiding delayer provided by the present invention is described in detail, applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention meanwhile.
Claims (10)
1. a voltage shock avoiding delayer, is characterized in that, comprising:
Filter unit, for carrying out the voltage signal after filtering output filtering to the line voltage of access;
Rectification energy-storage units, is connected with the output of filter unit, and filtered voltage signal is carried out to rectification output dc voltage, and carries out the storage of electric energy;
DC/DC converting unit, carries out DC voltage conversion output to the direct voltage of rectification energy-storage units output;
Sampling unit, described sampling unit is arranged on electrical network, and line voltage is sampled and exported;
Single-chip Controlling unit, described Single-chip Controlling unit is connected with DC/DC converting unit, receives the sample information of sampling unit, and exports control information;
Display setting device, is connected with Single-chip Controlling unit, receives the demonstration information that Single-chip Controlling unit sends to, and configuration information is sent to Single-chip Controlling unit;
Switch unit, described switch unit is arranged on A.C. contactor, is connected with the output of Single-chip Controlling unit.
2. a kind of voltage shock avoiding delayer according to claim 1, it is characterized in that, described filter unit adopts EMI filter unit, mainly formed by common mode choke and filter capacitor, the input of described filter unit is connected with electrical network, by the filter capacitor output on common mode choke and cross-over connection common mode choke.
3. a kind of voltage shock avoiding delayer according to claim 1, it is characterized in that, described rectification energy-storage units comprises rectification circuit and accumulator, and the input of described rectification circuit connects the output of described filter unit, and described accumulator is connected in parallel on the output of described rectification circuit.
4. a kind of voltage shock avoiding delayer according to claim 3, is characterized in that, described accumulator is electric capacity.
5. a kind of voltage shock avoiding delayer according to claim 3, is characterized in that, described accumulator is battery charger and storage battery, and the output of described filter unit connects described battery charger, and described battery charger is connected with storage battery.
6. a kind of voltage shock avoiding delayer according to claim 1, is characterized in that, described DC/DC converting unit converts the high voltage direct current of storage capacitor to maintain A.C. contactor work and the desired corresponding direct voltage of single-chip computer control system work to.
7. a kind of voltage shock avoiding delayer according to claim 1, is characterized in that, described Single-chip Controlling unit arranges watchdog circuit.
8. a kind of voltage shock avoiding delayer according to claim 1, it is characterized in that, described display setting device comprises display screen and input key, and described display setting device is connected with the output of Single-chip Controlling unit, and described load button is connected with the input of Single-chip Controlling unit.
9. a kind of voltage shock avoiding delayer according to claim 1, is characterized in that, described sampling unit arranges buffer circuit.
10. a kind of voltage shock avoiding delayer according to claim 9, is characterized in that, described buffer circuit is any one in transformer isolation or light-coupled isolation.
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| CN201410070031.4A CN103887115A (en) | 2014-02-27 | 2014-02-27 | Instantaneous power failure preventing delayer |
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| CN201410070031.4A CN103887115A (en) | 2014-02-27 | 2014-02-27 | Instantaneous power failure preventing delayer |
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| CN113783282A (en) * | 2020-06-09 | 2021-12-10 | 中石大蓝天(青岛)石油技术有限公司 | Anti-interference electricity device |
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