CN102761095B - Undervoltage-overvolprotection protection device and method - Google Patents
Undervoltage-overvolprotection protection device and method Download PDFInfo
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- CN102761095B CN102761095B CN201110108523.4A CN201110108523A CN102761095B CN 102761095 B CN102761095 B CN 102761095B CN 201110108523 A CN201110108523 A CN 201110108523A CN 102761095 B CN102761095 B CN 102761095B
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Abstract
The present invention proposes a kind of Undervoltage-overvolprotection protection device.This protective device comprises: single tripping coil (210), and it is connected in supply line, for performing trip action when obtaining big current; Testing circuit (220), for when line voltage distribution being detected lower than the first predetermined threshold or higher than the second predetermined threshold, produces under-voltage-overvoltage protection triggering signal; Drive unit (230), in response to described under-voltage-overvoltage protection triggering signal, make described tripping coil obtain big current, thus drive described tripping coil perform trip action.Adopt this Undervoltage-overvolprotection protection device only just can be realized the duplicate protection of under-voltage-overvoltage by a tripping coil.
Description
Technical field
The present invention relates to a kind of Undervoltage-overvolprotection protection device and method, particularly relate to and a kind ofly use single tripping coil to carry out under-voltage and apparatus and method that are overvoltage double protection.
Background technology
Generally speaking, the voltage in supply line is not a steady state value, and it may the corresponding generation fluctuation because of the change of load.This voltage fluctuation (as under-voltage or overvoltage) in supply line, once the scope exceeding that power consumption equipment can bear, will bring adverse influence to power consumption equipment, even cause the damage of power consumption equipment.Therefore, under-voltage protection and over-pressure safety device is usually adopted to ensure that power consumption equipment runs under normal power supply state.
Under-voltage protection generally refers to when supply line's voltage is lower than a predetermined threshold (such as lower than 80% of nominal voltage); protective device cuts off supply line automatically; until when line voltage distribution returns to normal range (NR), protective device manually can be returned to on-state again.Comparatively speaking; overvoltage protection refers to when line voltage distribution is more than a predetermined value (such as higher than 10% of nominal voltage); in order to prevent causing damage to power consumption equipment, the same line disconnection automatically of protective device and can manually recovering again when line voltage distribution recovers normal.
Undervoltage-overvolprotection protection device in the market mainly adopts 2 discrete tripping coils to realize detection and the protection act of under-voltage and overvoltage respectively.Fig. 1 schematically illustrates a kind of schematic diagram of existing Undervoltage-overvolprotection protection device 100.As shown in Figure 1, supply line L (live wire) and N (zero line) is used for providing electric energy to power consumption equipment 150.Protective device 100 is arranged on power consumption equipment side, and comprises two tripping coils 110 and 120.These two tripping coils are respectively used to perform trip action when under-voltage or overvoltage being detected.The trip action of tripping coil 110 and 120 and then drive circuit breaker 130 to disconnect the electrical connection of supply line to power consumption equipment 150 with mechanical drive mode.
Specifically, in FIG, the two ends of tripping coil 110 are connected on circuit L and N.When line voltage distribution V is lower than a predetermined threshold Vmin (namely under-voltage), the push rod in tripping coil 110 is in position 2, i.e. trip status, and and then the circuit breaker 130 on circuit L and N is disconnected for electrical connection.When line voltage distribution V reaches normal range (NR), the push rod in this tripping coil 110 transforms to position 1 from position 2, circuit breaker 130 is closed, line conduction.Tripping coil 120 is connected on supply line L and N via over-voltage detection circuit 140.When over-voltage detection circuit 140 detects that line voltage distribution V is normal, the push rod in tripping coil 120 is in position 1, circuit breaker 130 is closed, supply line's conducting.When over-voltage detection circuit 140 detects line voltage distribution V more than a predetermined threshold Vmax; it exports an overvoltage protection triggering signal; the push rod in tripping coil 120 is made to transform to position 2 from position 1; namely enter trip status, and and then cause the circuit breaker 130 on circuit L and N to disconnect for electrical connection.
Adopt structure as shown in Figure 1 can realize duplicate protection that is under-voltage, overvoltage.But, as seen from Figure 1, this Undervoltage-overvolprotection protection device need two independently tripping coil realize under-voltage, overvoltage protection respectively.And each tripping coil is because its volume of feature of its mechanical structure is relatively large, cost is also higher, particularly all the more so compared with electronic component.This shortcoming obviously can not meet the requirement of the miniaturization of current protective device, low cost.Therefore, existing this Undervoltage-overvolprotection protection device also requires further improvement.
Summary of the invention
The present invention is intended to propose a kind of Undervoltage-overvolprotection protection device and the method that use single tripping coil.This Undervoltage-overvolprotection protection device is obviously better than the existing Undervoltage-overvolprotection protection device with two tripping coil because only comprising a tripping coil on volume He on cost.
According to one aspect of the invention, Undervoltage-overvolprotection protection device comprises: single tripping coil, and it is connected in supply line, for performing trip action when obtaining big current; Testing circuit, for when line voltage distribution being detected lower than the first predetermined threshold or higher than the second predetermined threshold, produces under-voltage-overvoltage protection triggering signal; Drive unit, in response to described under-voltage-overvoltage protection triggering signal, make described tripping coil obtain big current, thus drive described tripping coil perform trip action.Adopt this Undervoltage-overvolprotection protection device only just can be realized the duplicate protection of under-voltage-overvoltage by a tripping coil.
In an embodiment of the invention; for driving the drive unit of tripping coil can be connected in parallel on the switching device in the load of connecting with described tripping coil in protective device; and this switching device in response to described under-voltage-overvoltage protection triggering signal and closing, namely short circuit is fallen load and is obtained big current to make tripping coil.Preferably, described switching device comprises transistor, field effect transistor, controllable silicon, electron tube or relay etc.Falling load by switching device short circuit can make tripping coil obtain big current easily, and circuit is simple, be easy to realize.More preferably, described testing circuit is the load of connecting with described tripping coil.
In an embodiment of the invention; described testing circuit in protective device can comprise over-voltage detection circuit and undervoltage detection circuit two parts, and to the testing result of over-voltage detection circuit and undervoltage detection circuit perform operate with (AND) after obtain described under-voltage-overvoltage protection triggering signal.Alternatively, under-voltage and over-voltage detection circuit also can integrate and be realized by one single chip.Preferably, described overvoltage and undervoltage detection circuit are realized by comparator, or are describedly realized by line and mode with logical operation.
In another embodiment, the described testing circuit in protective device can also comprise proof scheme, for verify described be greater than the 3rd predetermined threshold with logical operation result time export described under-voltage-overvoltage protection triggering signal.Alternatively, described testing circuit also comprises delay circuit, for carrying out time delay to described and logical consequence.The use of time delay and proof scheme can avoid the interference of short time, thus guarantees that protective device is more reliable.
In another embodiment of the present invention; protective device also comprises residual current protection circuit; its for detect there is leaky time; export earth leakage protective triggering signal; and described drive unit also makes described tripping coil obtain big current in response to described earth leakage protective triggering signal, thus described tripping coil performs trip action.So, residual current protection circuit is integrated in under-voltage overvoltage crowbar, and only uses single tripping coil just to achieve under-voltage, overvoltage and earth leakage protective triple functions.
According to a further aspect of the present invention, also proposed a kind of method of carrying out under-voltage-overvoltage protection.The method comprises: use single tripping coil, and described tripping coil to be connected in supply line and to perform trip action when obtaining big current; When line voltage distribution being detected lower than the first predetermined threshold or higher than the second predetermined threshold, produce under-voltage-overvoltage protection triggering signal; In response to described under-voltage-overvoltage protection triggering signal, make described tripping coil obtain big current, thus cause described tripping coil perform trip action.Thus, adopt the present invention propose method can realize under-voltage, overvoltage double protection by single tripping coil, thus reduce product volume, reduce cost.
Preferably, the method is also included in and detects when there is leaky, produces earth leakage protective triggering signal; Make described tripping coil obtain big current in response to described earth leakage protective triggering signal, thus described tripping coil perform trip action.Like this, the method adopting the present invention to propose can also while realizing under-voltage, overvoltage protection, integrated electricity leakage protection, and namely under-voltage, overvoltage and electric leakage triple protection are all realized by single tripping coil.This reduces small product size and cost further.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein,
Fig. 1 illustrates the schematic diagram of existing Undervoltage-overvolprotection protection device;
Fig. 2 exemplarily illustrates the structural representation of Undervoltage-overvolprotection protection device according to an embodiment of the invention;
Fig. 3 illustrates the circuit theory diagrams of Undervoltage-overvolprotection protection device according to an embodiment of the invention;
Fig. 4 illustrates the circuit theory diagrams of the Undervoltage-overvolprotection protection device according to another embodiment of the present invention.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.
Fig. 2 schematically illustrates the schematic diagram of Undervoltage-overvolprotection protection device 200 according to an embodiment of the invention.As shown in Figure 2, protective device 200 comprises single tripping coil 210, testing circuit 220 and drive unit 230 according to an embodiment of the invention.In protective device 200, only use a tripping coil 210 to be turned on or off for electrical connection with the circuit breaker 130 (such as miniature circuit breaker MCCB) on mechanical drive mode driver circuit L and N.Whether testing circuit 220 monitoring circuit occurs under-voltage or overvoltage, and it is once detect that under-voltage or overvoltage just sends a protection triggering signal to drive unit 230.In response to this protection triggering signal, drive unit 230 makes tripping coil 210 thread off because obtaining a big current, and and then causes circuit breaker 130 to disconnect for electrical connection.So, in the present invention, no matter testing circuit 220 detects under-voltage or overvoltage, all triggers a unique tripping coil by drive unit and realizes protection act.Adopt the protective device 200 shown in Fig. 2 just can realize the dual-use function of under-voltage-overvoltage protection only by single tripping coil 210, the volume of protective device 200 and cost are all reduced thus, can adapt to the demand of current miniaturization.
In fig. 2, testing circuit 220 and drive unit 230 can have multiple implementation.Such as, drive unit 230 can be a switching device being connected in parallel in the load of connecting with tripping coil 210.In a preferred simple embodiment, testing circuit is the load of connecting with tripping coil 210.Such as, but it will be understood by those skilled in the art that this load also may comprise other forms, it also can comprise the resistance R0 (as shown in Figure 3) in parallel with testing circuit alternatively.This switching device can close in response to the protection triggering signal of testing circuit 220, and namely, the testing circuit fallen as load by short circuit makes tripping coil 210 obtain a big current, and drives it to perform trip action thus.Alternatively, drive unit 230 can also be realized by other circuit, makes tripping coil 210 obtain a big current as by capacitor discharge, etc.
Similarly, testing circuit 220 also can have multiple implementation, and such as testing circuit can comprise over-voltage detection circuit and undervoltage detection circuit two parts, also can realize under-voltage and detection that is overvoltage by single integrated chip.Analog comparison circuit known in the field and under-voltage or over-voltage detection circuit itself can be implemented as the comparator as being made up of amplifier, also can use obtainable voltage checking chip on market, even can be used to realize.
Fig. 3 shows the circuit diagram of Undervoltage-overvolprotection protection device 300 according to an embodiment of the invention.In protective device 300, tripping coil 210 is connected in supply line.Drive unit is embodied as a switching device, such as controllable silicon 330.Testing circuit 320 comprises two comparators be made up of amplifier U1 and U2, for realizing under-voltage (322) and overvoltage detection (321) respectively.Testing result that is under-voltage and overvoltage performs line and operation at a B, and acquired results is under-voltage-overvoltage protection triggering signal, in order to trigger controllable silicon 330.
Specifically, in figure 3, tripping coil 210 is a high-tension coil, and it can perform trip action when operating voltage is such as greater than 50V.In figure 3, this tripping coil 210 was such as connected on circuit L before rectification circuit.Line voltage distribution V1 after rectification is added on testing circuit 320 and controllable silicon 330, and testing circuit 320 can regard as the load of connecting with tripping coil thus, and this testing circuit and resistance R0 all in parallel with controllable silicon.
As shown in Figure 3, on a branch road, line voltage distribution V1 is added in the series arm that the electric capacity C4 of resistance R10 and parallel connection and voltage stabilizing didoe D1 forms, with at an A for each amplifier U1-U3 provides stable power supply.Meanwhile, the voltage of some A is also added in the series arm of resistance R7, R8 and R4, and is respectively at an A1 and some A2 reference voltage Vmin and Vmax that amplifier U1 and U2 provides stable.
On another branch road, line voltage distribution V1 is added in the series arm that the R3 of resistance R11 and parallel connection and electric capacity C1 forms, and the line voltage distribution V2 obtain dividing potential drop on electric capacity C1 after.Line voltage distribution V2 is fed to the input of two amplifier U1 and U2 respectively as the line voltage distribution detected.Amplifier U1 is used as the comparator that overvoltage detects (321), and when voltage V2 is greater than Vmax, when namely there is overvoltage, U1 exports a high level, phase reinfusion low level.Amplifier U2 is used as the comparator of under-voltage detection (322), and when voltage V2 is less than Vmin, when namely occurring under-voltage, U2 exports a high level.
The result that U1 and U2 exports at a B place line and.That is, when in U1 and U2, the testing result of any one is high, some B voltage is high.In other words, under-voltage or overvoltage no matter detected, some B is height.Here the simplest wired-AND logic circuits is merely provided.According to actual needs, can also via such as coming with logical circuits such as doors to perform the result that U1 and U2 exports and the operation of logic.Can directly as protecting triggering signal to drive controllable silicon 330 with the result of operation.If B point is high (having occurred under-voltage or overvoltage), then controllable silicon 330 conducting, the whole testing circuit 320 as load is shorted, and tripping coil 210 is threaded off because obtaining big current thus, and then causes circuit breaker 130 to disconnect for electrical connection.On the contrary, if B point is low (do not occur under-voltage, also do not occur overvoltage), then controllable silicon 330 ends, and tripping coil 210 normally works, line conduction.
In order to avoid because disturbing the misoperation caused, in the example shown in Fig. 3, be also preferably provided with delay circuit 325 and proof scheme 327.Delay circuit 325 is made up of resistance R5 and electric capacity C2, and delay time can be set to tens as required to hundreds of millisecond.Signal Vb after time delay sends into proof scheme 327.In proof scheme 327, a signal Vb and reference voltage Vref (it is obtained by divider resistance R9 and R6) after time delay compares by U3.If U3 comparative result is Vb be greater than Vref, then prove really to have occurred under-voltage or overvoltage, U3 exports a high level, and as protection triggering signal, this high level can drive controllable silicon 330 equally.In addition, in the example shown in Fig. 3, also more preferably include a filter circuit at the output of U3, it is made up of R13, C3 and R14, in order to eliminate the high frequency variable quantity in protection triggering signal, in order to avoid misoperation.
In the example shown in Fig. 3, switching device 330 adopts controllable silicon to realize.But, it will be understood by those skilled in the art that this switching device can also adopt such as field effect transistor, triode, electron tube, relay etc. to realize.And deficient, over-voltage detection circuit shown in Fig. 3 also can carry out alternative amplifier with other comparison circuits that such as analog element realizes.
Fig. 4 schematically shows in accordance with another embodiment of the present invention with the circuit diagram of earth leakage protective Undervoltage-overvolprotection protection device 400.As shown in Figure 4, Undervoltage-overvolprotection protection device 400 difference compared with the protective device 300 shown in Fig. 3 is to add residual current protection circuit 450.As shown in Figure 4, residual current protection circuit 450, once detect that leaky just exports a high level to the output D of U3, performs line and operation with the Output rusults of U3.That is, no matter under-voltage or overvoltage whether being detected, once electric leakage be detected, trigger controllable silicon 330 conducting, to make tripping coil 210 thread off because obtaining big current, and and then causing circuit breaker 130 open circuit to connect.
Fig. 4 illustrate only an example of residual current protection circuit 450.This circuit 450 comprises leakage indicator 451 and control chip 455.The leakage current detected is sent into the pin one-2 of control chip 455 by creepage mutual inductor 451.The leakage current of control chip 455 to input judges.Once control chip 455 is judged as having occurred leaky, then export the output of an earth leakage protective triggering signal to U3 at its pin 7, perform corresponding operating to drive controllable silicon.The structure of residual current protection circuit is here only an example.Those skilled in the art can according to practical application need other residual current protection circuits are integrated into according to of the present invention under-voltage-overvoltage crowbar in.In addition, the output of residual current protection circuit also can be added in a B position, after via U3 checking, drive controllable silicon 330 again.
Fig. 2-4 shows the structure of the Undervoltage-overvolprotection protection device 200,300,400 proposed according to the embodiment of the present invention.Said apparatus is formed according to following mentality of designing substantially, that is, use single tripping coil, and described tripping coil is connected in supply line, and it performs trip action when obtaining big current; When line voltage distribution being detected lower than the first predetermined threshold or more than the second predetermined threshold, produce under-voltage-overvoltage protection triggering signal; In response to described under-voltage-overvoltage protection triggering signal, impel described tripping coil obtain big current, thus cause described tripping coil perform trip action.The above-mentioned mentality of designing that the present invention proposes can be guaranteed to realize under-voltage and duplicate protection that is overvoltage when being only suitable for single tripping coil, and thus this mentality of designing can make the volume of Undervoltage-overvolprotection protection device reduce, and is applicable to the demand of current miniaturization.Meanwhile, above-mentioned mentality of designing realizes easy, only can realize with the electronic component of low cost, thus while reduced volume, also reduce equipment cost.
Preferably, this mentality of designing is also included in and detects when there is leaky, produces earth leakage protective triggering signal; Make described tripping coil obtain big current in response to described earth leakage protective triggering signal, thus described tripping coil perform trip action.Like this, the mentality of designing adopting the present invention to propose can also while realizing under-voltage, overvoltage protection, integrated electricity leakage protection, and namely under-voltage, overvoltage and electric leakage triple protection are all realized by single tripping coil.This reduces small product size and cost further.
Be to be understood that, although this specification describes according to each embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
The foregoing is only the schematic embodiment of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present invention and principle, amendment and combination, all should belong to the scope of protection of the invention.
Claims (12)
1. a Undervoltage-overvolprotection protection device, this device (200,300,400) comprising:
Single tripping coil (210), is connected in supply line, for performing trip action when obtaining big current;
Testing circuit (220), for when line voltage distribution being detected lower than the first predetermined threshold or higher than the second predetermined threshold, produces under-voltage-overvoltage protection triggering signal;
Drive unit (230), in response to described under-voltage-overvoltage protection triggering signal, make described tripping coil obtain big current, thus drive described tripping coil perform trip action;
Residual current protection circuit (450); comprise leakage indicator (451) and control chip (455); for detect there is leaky time; the leakage current detected is sent into control chip (455) by described leakage indicator (451); trigger described control chip (455) and export earth leakage protective triggering signal; and described drive unit (230) also makes described tripping coil (210) obtain big current in response to described earth leakage protective triggering signal; thus described tripping coil (210) performs trip action
Wherein, described drive unit (230) also in response to described earth leakage protective triggering signal and described under-voltage-overvoltage protection triggering signal between drive described tripping coil with operating result.
2. Undervoltage-overvolprotection protection device as claimed in claim 1; wherein said drive unit (230) for being connected in parallel on the switching device (330) in the load of connecting with described tripping coil, and this switching device (330) in response to described under-voltage-overvoltage protection triggering signal and closing.
3. Undervoltage-overvolprotection protection device as claimed in claim 2, wherein, described switching device (330) comprises transistor.
4. Undervoltage-overvolprotection protection device as claimed in claim 2, wherein, described switching device (330) comprises in field effect transistor, controllable silicon, electron tube and relay arbitrary.
5. Undervoltage-overvolprotection protection device as claimed in claim 2, wherein said testing circuit (220) is connected with described tripping coil as described load.
6. Undervoltage-overvolprotection protection device as claimed in claim 1; wherein; described testing circuit (320) comprises over-voltage detection circuit (321) and undervoltage detection circuit (322), and for the testing result of over-voltage detection circuit and undervoltage detection circuit is done operate with (AND) and logical circuit.
7. Undervoltage-overvolprotection protection device as claimed in claim 6, wherein, described overvoltage and undervoltage detection circuit comprise comparator (U1, U2).
8. Undervoltage-overvolprotection protection device as claimed in claim 7; wherein; described testing circuit (320) also comprises proof scheme (327), for verify the described signal exported with logical circuit export when being greater than the 3rd predetermined threshold described under-voltage-overvoltage protection triggering signal.
9. Undervoltage-overvolprotection protection device as claimed in claim 8, wherein, described testing circuit (320) also comprises delay circuit (325), for the signal exported with logical circuit described in time delay.
10. Undervoltage-overvolprotection protection device as claimed in claim 1, wherein, described tripping coil (210) is high-tension coil.
11. 1 kinds of methods of carrying out under-voltage-overvoltage protection, in the device as described in any one of claim 1-10, comprising:
Use single tripping coil, described tripping coil is connected in supply line, and performs trip action when obtaining big current;
When line voltage distribution being detected lower than the first predetermined threshold or higher than the second predetermined threshold, produce under-voltage-overvoltage protection triggering signal;
In response to described under-voltage-overvoltage protection triggering signal, make described tripping coil obtain big current, thus cause described tripping coil perform trip action;
Detect there is leaky time, produce earth leakage protective triggering signal;
Make described tripping coil (210) obtain big current in response to described earth leakage protective triggering signal, thus described tripping coil (210) perform trip action,
Wherein said under-voltage-overvoltage protection triggering signal and earth leakage protective triggering signal perform and operation, and with operating result for driving described tripping coil.
12. methods as claimed in claim 11, wherein make described tripping coil obtain the step of big current and comprise falling the load of connecting with described tripping coil by short circuit and making described tripping coil obtain big current.
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| CN201110108523.4A CN102761095B (en) | 2011-04-28 | 2011-04-28 | Undervoltage-overvolprotection protection device and method |
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| CN201110108523.4A CN102761095B (en) | 2011-04-28 | 2011-04-28 | Undervoltage-overvolprotection protection device and method |
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| CN102761095B true CN102761095B (en) | 2015-09-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6168491B2 (en) * | 2013-03-29 | 2017-07-26 | パナソニックＩｐマネジメント株式会社 | Circuit breaker undervoltage trip device and overvoltage / undervoltage trip device |
| JP6168342B2 (en) * | 2013-03-29 | 2017-07-26 | パナソニックＩｐマネジメント株式会社 | Circuit breaker overvoltage / undervoltage trip device |
| JP2014199724A (en) * | 2013-03-29 | 2014-10-23 | パナソニック株式会社 | Undervoltage tripper for circuit breaker and overvoltage/undervoltage tripper |
| CN103326322A (en) * | 2013-06-14 | 2013-09-25 | 常熟市九洲电器设备有限公司 | Motor voltage protection and control circuit |
| CN104577947A (en) * | 2013-10-21 | 2015-04-29 | 无锡华阳科技有限公司 | Overvoltage and undervoltage protection device with function of displaying overvoltage or undervoltage |
| CN105991101B (en) * | 2015-03-06 | 2019-07-23 | 展讯通信（上海）有限公司 | A kind of supply self adaptation operational amplifier |
| CN108155622A (en) * | 2018-01-24 | 2018-06-12 | 宁波大家小家网络科技有限公司 | A kind of overvoltage/undervoltage protective device for electric system |
| CN109193561A (en) * | 2018-09-30 | 2019-01-11 | 公牛集团股份有限公司 | A kind of integrated-type residual current action breaker |
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| US20090237187A1 (en) * | 2006-09-21 | 2009-09-24 | Daniel Gawendowicz | Auxiliary release for a circuit breaker |
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| CN200987066Y (en) * | 2006-12-19 | 2007-12-05 | 欣灵电气股份有限公司 | Household line protector |
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