CN2932790Y - An AC over-voltage protector - Google Patents
An AC over-voltage protector Download PDFInfo
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- CN2932790Y CN2932790Y CN 200620041492 CN200620041492U CN2932790Y CN 2932790 Y CN2932790 Y CN 2932790Y CN 200620041492 CN200620041492 CN 200620041492 CN 200620041492 U CN200620041492 U CN 200620041492U CN 2932790 Y CN2932790 Y CN 2932790Y
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Abstract
The utility model discloses an alternating current over-voltage protector. A main normally closed contact of an alternating current contactor is used in the alternating current main return circuit, the control circuit is divided into three-phase alternating current which are respectively independent, comprising a current fold-back circuit, an isolating circuit of alternating current signal, a constant voltage power supply circuit, an alternating current contactor, a sampling control circuit, a contactor solenoid protection circuit and an anti shake circuit, wherein the current fold-back circuit can provide protection during self-overflowing, a three-terminal adjustable by-pass datum chip TL431 is used as a main element in the sampling control circuit to compare and control the sampling signal, the anti shake circuit comprises a filter circuit, a feedback loop, a capacitor and a charge and discharge circuit of the capacitor. The utility model has the advantages of that: 1. three-phase independent control without any affection to each other. 2. The utility model will not lead to the breakage of the communication system during self-abnormal. 3. The utility model can effectively increase the operation voltage range of the alternating current contactor solenoid. 4. The utility model has a wide-range of the operation voltage. 5. The utility model has simple structure, and quick and reliable protections.
Description
Technical field
The utility model relates to a kind of AC overvoltage protection device, and particularly a kind of protection post and telecommunications equipment, particularly communication of aiming at designs, is applicable to the AC overvoltage protector in the various places that alternating current is comparatively abominable with high frequency switch power.
Background technology
Along with developing rapidly of the communication technology, people are to the hurried increase of communication requirement, and the communications equipment room facility has spreaded all over each corner in town and country.Normally carry out the power source of communication equipment for what ensure communication---communication has become a critical problem with the reliability of high frequency switch power supply system work.
Though communication has been accomplished wide voltage civil power accommodation: 90Vrms～300Vrms (single-phase) with high frequency switch power supply system, but the complexity of China's electric power system, make that different regions AC power difference in quality is very big, particularly away from some outlying rural areas in city, its city's electricity quality is more abominable, add some inherent external factors, as thunderbolt, transfer impedance, nonlinear load, the startup of motor load, and a large amount of uses of high-frequency changeover module etc., make AC power waveform distort, voltage still happens occasionally above the voltage range that the communication switch power system can bear.The instability of civil power has become present communication and has used one of main arch-criminal of high frequency switch power rectification module damage.
At present, though existing on the market multiple interchange overvoltage/undervoltage protective device is concluded and is got up to have following a few class characteristics:
1. protection range is narrow: this type of exchanges the protective device voltage range and mostly is: ± 15%, mainly be applicable to civilian level, and can't bring into play the advantage of communication with the wide voltage adaptation scope of high frequency switch power.
2. self operating voltage range is narrow, poor reliability: can carry out the reliable protection action with high frequency switch power supply system to communication though this type of exchanges protective device, can not long-term work exchange under the overvoltage condition, otherwise self damage, defencive function lost efficacy.
3. defencive function is not proper, during inefficacy, easily makes communications equipment room outage: when three phase supply, one mutually or two-phase occur when unusual, this type of exchanges protective device and three-phase alternating current all can be cut off.If the city power recovery is untimely, the danger at disconnected station might appear.Failure state is the interchange protective device of ac circuit off-state, in case the serious consequences such as will causing disconnected station that lost efficacy.
4. the protection movement response is slow: though exchanging protective device, this type of can move by execute protection, and its just action behind three, four ac cycles of ac high-voltage often, the possibility of result is that communication damages with the high frequency switch power rectification module.
5. price height: this type of exchanges protective device and is generally the automatic voltage regulation AC power, and jumbo stabilized voltage power supply, its price are expensive.
In sum, existing interchange over-pressure safety device is difficult to communication is accomplished real effective protection with high frequency switch power.
Summary of the invention
The purpose of this utility model is to provide a kind of AC overvoltage protector; can make a response rapidly at overvoltage, moment surging/pulse etc. in the civil power effectively; reach the function that the protection rectification module is not subjected to the ac high-voltage injury; it is narrow to have solved existing interchange overvoltage/undervoltage protective device protection range; self operating voltage range is narrow, poor reliability, and defencive function is not proper; easily make the communications equipment room outage during inefficacy, the slow and problem of ultra-high price of protection movement response.
In order to realize above purpose, the utility model provides a kind of AC overvoltage protector, comprise the current foldback circuit in this protector control circuit, the ac signal buffer circuit, voltage-stabilized power supply circuit, A.C. contactor, the controlling of sampling circuit is characterized in that: also comprise contactor line bag protective circuit and anti-twitter circuit; The control circuit of this protector is independent respectively for exchanging three-phase, is serially connected with an A.C. contactor independently in the three-phase alternating current major loop respectively, and A.C. contactor adopts normally-closed contact;
Three-phase alternating current is divided into two-way after the overcurrent protective circuit; one the tunnel is connected with contactor line bag protective circuit; power supply as contactor line bag protective circuit; another road is behind the ac signal buffer circuit; be divided into two-way output again: the one tunnel connects voltage-stabilized power supply circuit; produce the power supply of entire circuit; another road connects the controlling of sampling circuit; AC signal input as the controlling of sampling circuit; the output control signal of controlling of sampling circuit is through anti-twitter circuit; the power supply of control A.C. contactor line bag, thereby the switching of control ac main circuit.
Described current foldback circuit provides self overcurrent protection.Can adopt traditional fuse protected circuit, the also available self-resetting type current foldback circuit that constitutes by semistor with auto-reset function.
Described controlling of sampling circuit comprises a comparison controller spare, and sampled signal is compared control, the adjustable shunting fiducial chip of optional three ends of comparison controller spare TL431; One bleeder circuit will offer comparison controller spare after the sampled signal dividing potential drop.
Described anti-twitter circuit comprises a filter circuit, and the noise in the AC signal of sampling is carried out filtering; One feedback loop when the comparison controller spare sampling end current potential in the controlling of sampling circuit surpasses reference voltage, feeds back to sampling end with high potential; One electric capacity is charge-discharge circuit extremely, and the relay in the subsequent conditioning circuit is moved when controlling of sampling circuit output overvoltage signal immediately, resets during recovery latency.
Described contactor line bag protective circuit comprises surge absorber spare, and to absorb the impact of high voltage transient spike, surge absorber spare can be selected the TVS voltage stabilizing didoe for use, also can select varistor for use; One AC impedance device is connected with contactor line bag, and to reduce the voltage of contactor line bag, the AC impedance device can adopt R, C sequential circuit, also can adopt pure resistance.
The AC overvoltage protector can also comprise three-phase alternating current pressure condition LED indication and control loop functional test circuit.
The beneficial effects of the utility model are: adopt alternating current three-phase absolute construction, have three-phase and independently control, the function that is independent of each other; Ac main circuit adopts A.C. contactor master normally-closed contact, and its failure mode is the ac circuit closed mode, in the time of can preventing that self is unusual, causes the disconnected station of communication system; Distinctive contactor line bag current foldback circuit can effectively improve the job contract of A.C. contactor line and make voltage range; Self operating voltage range is wide, can reliably working in exchanging under the single-phase 400Vrms voltage; Circuit is simple, and the protection movement response is rapid and reliable.
Description of drawings
Fig. 1 is a circuit function block diagram of the present utility model
Fig. 2 is the circuit diagram of current foldback circuit
Fig. 3 is the internal circuit schematic diagram of the adjustable shunting fiducial chip of three ends TL431
Fig. 4 is the schematic symbol diagram of the adjustable shunting fiducial chip of three ends TL431
Fig. 5 is the circuit diagram of controlling of sampling circuit
Fig. 6 is the circuit diagram of anti-twitter circuit
Fig. 7 is the circuit diagram of contactor line bag protective circuit
Embodiment
Below in conjunction with drawings and Examples the utility model is further described
Ac main circuit in Fig. 1 circuit function block diagram: three-phase alternating current behind the main normally-closed contact of three A.C. contactors 8, is directly powered to power consumption equipment respectively.Its failure mode of this structure is the ac circuit closed mode, in the time of can preventing that contactor 8 self is unusual, causes the situation at the disconnected station of communication system.Control loop: three-phase alternating current is through being divided into two-way behind overcurrent and the surge protection circuit 1: after the path contactor line bag protective circuit 2, as the power supply of contactor line bag; Another road is behind ac signal buffer circuit 3, and be divided into two-way output again: the one tunnel connects voltage-stabilized power supply circuit 4, produces the power supply of entire circuit; Another road connects AC signal and monitors for TL431 through peak value sampling circuit 5.TL431 relatively judges through inside according to the signal of gathering, and produces control signal and controls the power supply of A.C. contactor line bag again through anti-twitter circuit 6, thereby realize the through and off of ac main circuit, and the protection power consumption equipment is not damaged by ac high-voltage.Entire circuit also is provided with three-phase alternating current pressure condition LED indication and control loop functional test circuit 7.When a certain cross streams voltage surpassed set point, the LED of corresponding phase can be lighted; When alternating voltage is normally worked down, want to judge whether the control circuit function is normal, when the scene can't maybe can not be simulated again, can put and press each corresponding test button, know just whether the function of control circuit is lost.
RT is the semistor (hereinafter to be referred as PPTC) with auto-reset function in Fig. 2 current foldback circuit, in order to replace traditional overcurrent fuse.Though these two kinds of products can both provide the overcurrent protection effect, and advantage is separately respectively arranged, same PPTC thermistor can repeatedly provide this protection, and fuse just must be replaced with other one after overcurrent protection is provided.In a single day overcurrent occurs in the circuit, PPTC can keep high resistance state up to fixing a breakdown always.Select for use suitable PPTC thermistor can effectively avoid transformer itself and associated circuit when abnormal current, to suffer badly damaged.
Ac signal buffer circuit: utilize traditional transformer that the working power of alternating voltage sampled signal and The whole control circuit is provided respectively, the electric network peak impulse disturbances is had good effect, also isolated the common mode disturbances of ground loop effectively.
Voltage-stabilized power supply circuit: but circuit adopts not only single phase power supply but also mode that can three phase supply in design, guarantee the power supply to the The whole control circuit.
Main device in Fig. 5 controlling of sampling circuit adopts the adjustable shunting fiducial chip of three ends TL431, its internal circuit as shown in Figure 3, symbol is as shown in Figure 4.In circuit, R is held as AC signal sampling input, utilize its inner 2.5V a reference source to compare control as the reference current potential.The voltage that is increased to R end when alternating voltage is during very near 2.5V a reference source, just having a stable unsaturation electric current in its inner triode passes through, and along with the minor variations of R terminal voltage, to change from 1 to 100mA by the triode electric current, convert this variable signal the voltage signal CTR1 of variation to, utilize CTR1 to reach the final interchange output function of control.This circuit tool circuit is simple, is quick on the draw advantages such as reliable operation.Gather the peak values of ac of coming and offer the TL431 detection through R1, R2 dividing potential drop.Change the voltage ratio of R1 and R2, just can change the value of the interchange over-voltage protection point of circuit.LED1 indicates as AC overvoltage; C1, R1, C2 form the π filter, and the pop wave absorbing circuit and the transformer isolation circuit that adopt with the front carry out filtering to useless noise in the AC signal of being sampled, thereby make TL431 be unlikely to misoperation; R4 is in order to regulate the K electrode current of TL431.
Fig. 6 prevents twitter circuit, adopted tertiary prevention relay R LY shake measure altogether: 1, noise filtering method: pop wave absorbing circuit, transformer isolation circuit and C1, R1, C2 form filter circuit, can carry out filtering to useless noise in the AC signal of being sampled, not therefore make TL431 be unlikely to misoperation, thereby guarantee that RLY can be and misoperation.2, alternating voltage recovers the return difference method: form positive feedback loop by R6 among Fig. 6 and D2, when making circuit at alternating voltage in case above set point, relay R LY is reliably adhesive just, and when alternating voltage fell back to certain return difference value, RLY just can reset.This return difference generally is set in about 10Vac.When the alternating voltage rising makes the R terminal potential of TL431 surpass 2.5V, the CTR1 level will be by " H " change " L ", and VCC will further improve the current potential that R holds by Q1 through the R end that D2, R6 feed back to TL431, make the CTR1 level remain on " L ", relay R LY just can be in attracting state.3, reset time expander method: Q1 and R7 and Q2, R8, R9 and D2, R6 of relay forms the charge-discharge circuit to C3, making control circuit have the overvoltage relay of interchange RLY can move immediately, the characteristics of RLY energy time-delay reset when alternating voltage recovers, thereby the frequent jitter phenomenon of further avoiding RLY to occur.
The three-phase alternating current major loop adopts a tool master normally-closed contact A.C. contactor as master component respectively, and its failure mode is the ac circuit closed mode, in the time of can preventing that self is unusual, causes the situation at the disconnected station of communication system.Owing to be to utilize the normally closed main contacts of contactor to control ac main circuit, at alternating voltage just often, contactor line Bao Buhui gets electric, so stand-by power consumption is minimum.But when overvoltage appears in interchange; major loop will disconnect; contactor line bag just can get; and the interchange of this moment is to be in overvoltage condition; its magnitude of voltage all surpassed the withstand voltage scope that contactor line bag can bear (GB: ± 15%Ue), so in circuit design, must consider safeguard measure to contactor line bag.This AC overvoltage protector mainly adopts the achieve a butt joint protection of tentaculum line bag of following measure: after 1, self-resetting type overcurrent and surge protection circuit are taken from the power supply of contactor line bag, can prevent contactor line bag not to be subjected to the impact of high voltage transient spike.2, the branch platen press reduces the voltage of contactor line bag.
Fig. 7 contactor line bag protective circuit: KM is an A.C. contactor line bag; K is the contactor normally closed auxiliary contact; RLY is the normally opened contact of relay; Rx is an AC impedance device, can be according to design requirement, select the step-down of R, C serial connection, or only with R etc.At alternating voltage just often, RLY is in normally open, and contactor line bag KM can not get electric, and major loop keeps normal output; When alternating voltage raises above setting protection point; RLY just can adhesive; alternating voltage is by normally-closed contact K; contact K provides moment a starting resistor for contactor line bag KM, in case after the contactor adhesive, just can be in off-state; this moment, Rx just can form the polyphone loop with contactor line bag KM; by Rx divide certain voltage, contactor line bag KM is still remained under the lower sustaining voltage when exchanging overvoltage, thereby has realized protection contactor line bag KM.Here mainly be to utilize contactor pick-up voltage height, the characteristic that sustaining voltage is low.Surge absorber spare 9 can be selected new and effective device TVS (Transient Voltage Suppressor) for use, and this kind device in fact is a kind of special voltage stabilizing didoe.When the high energy impact events of moment is stood at its two ends; it can become Low ESR to the resistance value between two ends by high impedance with high speed; absorb an instantaneous large-current; thereby on a predetermined numerical value, protected its both end voltage strangulation the circuit unit of back not to be subjected to the impact of high voltage transient spike.Just because of this, its lightning protection effect is also fine.Certainly surge absorber spare 9 also can be selected varistor for use, and the response time that is it is slow, is generally 5 * 10
-9S, its serviceability temperature narrow range, leakage current is big, and absorption current is little, and volume is also bigger.
Above-described embodiment is only in order to illustrate technological thought of the present utility model and characteristics; its purpose makes those of ordinary skill in the art can understand content of the present utility model and is implementing according to this; the scope of this patent also not only is confined to above-mentioned specific embodiment; be all equal variation or modifications of doing according to the spirit that the utility model disclosed, still be encompassed in the protection range of the present utility model.
Claims (10)
1, a kind of AC overvoltage protector comprises the current foldback circuit in this protector control circuit, the ac signal buffer circuit, voltage-stabilized power supply circuit, A.C. contactor, the controlling of sampling circuit is characterized in that: also comprise contactor line bag protective circuit and anti-twitter circuit;
The control circuit of this protector is for exchanging the three-phase overvoltage crowbar of independent control respectively, is serially connected with an A.C. contactor independently in the three-phase alternating current major loop respectively, and A.C. contactor adopts normally-closed contact;
Three-phase alternating current is divided into two-way behind the self-resetting type current foldback circuit; one the tunnel is connected with contactor line bag protective circuit; power supply as contactor line bag protective circuit; another road is behind the ac signal buffer circuit; be divided into two-way output again: the one tunnel connects voltage-stabilized power supply circuit; produce the power supply of entire circuit; another road connects the controlling of sampling circuit; AC signal input as the controlling of sampling circuit; the output control signal of controlling of sampling circuit is through anti-twitter circuit; the power supply of control A.C. contactor line bag, thereby the switching of control ac main circuit.
2, by the described a kind of AC overvoltage protector of claim 1, it is characterized in that: described current foldback circuit is self-resetting type current foldback circuit or electric fuse protective circuit.
3, by the described a kind of AC overvoltage protector of claim 2, it is characterized in that: be serially connected with a macromolecular positive temperature coefficient thermosensitive resistor with auto-reset function in the described self-resetting type current foldback circuit, so that overcurrent protection to be provided.
4, by the described a kind of AC overvoltage protector of claim 1, it is characterized in that: described controlling of sampling circuit comprises a comparison controller spare, and sampled signal is compared control; One bleeder circuit will offer comparison controller spare after the sampled signal dividing potential drop.
5, by the described a kind of AC overvoltage protector of claim 4, it is characterized in that: described comparison controller spare is the adjustable shunting fiducial chip of three ends TL431.
6, by the described a kind of AC overvoltage protector of claim 1, it is characterized in that: described anti-twitter circuit comprises a filter circuit, and the noise in the AC signal of sampling is carried out filtering; One feedback loop when the comparison controller spare sampling end current potential in the controlling of sampling circuit surpasses reference voltage, feeds back to sampling end with high potential; One electric capacity and charge-discharge circuit thereof move the relay in the subsequent conditioning circuit immediately when controlling of sampling circuit output overvoltage signal, reset during recovery latency.
7, by the described a kind of AC overvoltage protector of claim 1, it is characterized in that: described contactor line bag protective circuit comprises an AC impedance device, connects with contactor line bag, to reduce the voltage of contactor line bag; And surge absorber spare, to absorb the impact of high voltage transient spike.
8, by the described a kind of AC overvoltage protector of claim 7, it is characterized in that: described surge absorber spare can adopt the TVS voltage stabilizing didoe, also can adopt varistor.
9, by the described a kind of AC overvoltage protector of claim 7, it is characterized in that: described AC impedance device can adopt R, C sequential circuit, also can adopt pure resistance.
10, by the described a kind of AC overvoltage protector of claim 1, it is characterized in that: described AC overvoltage protector also comprises three-phase alternating current pressure condition LED indication and control loop functional test circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620041492 CN2932790Y (en) | 2006-04-29 | 2006-04-29 | An AC over-voltage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620041492 CN2932790Y (en) | 2006-04-29 | 2006-04-29 | An AC over-voltage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2932790Y true CN2932790Y (en) | 2007-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620041492 Expired - Fee Related CN2932790Y (en) | 2006-04-29 | 2006-04-29 | An AC over-voltage protector |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707266B (en) * | 2009-11-03 | 2011-10-12 | 深圳市科亮特科技有限公司 | Charge-discharge control circuit |
| CN103944140A (en) * | 2014-03-05 | 2014-07-23 | 重庆四联光电科技有限公司 | Alternating current input over-voltage protection circuit |
| TWI493197B (en) * | 2012-03-12 | 2015-07-21 | Panasonic Corp | Power meter |
| CN108173266A (en) * | 2018-01-25 | 2018-06-15 | 北京航天发射技术研究所 | A kind of DC uninterrupted electric power system and method for supplying power to |
| CN109755921A (en) * | 2017-11-08 | 2019-05-14 | 苏州益而益电器制造有限公司 | Ground-fault interrupter |
-
2006
- 2006-04-29 CN CN 200620041492 patent/CN2932790Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707266B (en) * | 2009-11-03 | 2011-10-12 | 深圳市科亮特科技有限公司 | Charge-discharge control circuit |
| TWI493197B (en) * | 2012-03-12 | 2015-07-21 | Panasonic Corp | Power meter |
| CN103944140A (en) * | 2014-03-05 | 2014-07-23 | 重庆四联光电科技有限公司 | Alternating current input over-voltage protection circuit |
| CN103944140B (en) * | 2014-03-05 | 2016-08-17 | 重庆四联光电科技有限公司 | Alternating-current input overvoltage protection circuit |
| CN109755921A (en) * | 2017-11-08 | 2019-05-14 | 苏州益而益电器制造有限公司 | Ground-fault interrupter |
| CN108173266A (en) * | 2018-01-25 | 2018-06-15 | 北京航天发射技术研究所 | A kind of DC uninterrupted electric power system and method for supplying power to |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070808 Termination date: 20140429 |