CN202167825U - Three-phase overvoltage detection protective device - Google Patents
Three-phase overvoltage detection protective device Download PDFInfo
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- CN202167825U CN202167825U CN2011202268971U CN201120226897U CN202167825U CN 202167825 U CN202167825 U CN 202167825U CN 2011202268971 U CN2011202268971 U CN 2011202268971U CN 201120226897 U CN201120226897 U CN 201120226897U CN 202167825 U CN202167825 U CN 202167825U
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Abstract
The utility model discloses a three-phase overvoltage detection protective device which is used to simplify an overvoltage protective circuit of a three-phase power supply system. The three-phase overvoltage detection protective device includes a rectification unit, a detection unit, and a trigger unit, wherein the rectification unit includes three rectification circuits. Each rectification circuit converts an alternating voltage signal of one phase of the three-phase power supply system into a direct voltage signal, and then outputs the direct voltage signal to the detection unit. The detection unit includes three sampling circuits and a detection circuit, wherein when each sampling circuit acquires the direct voltage signal of one phase, the sampling circuit converts the direction voltage signal into a sampling signal, and then outputs the sampling signal to the detection circuit. The detection circuit determines the sampling signal having the largest voltage value in the three sampling signals as a detecting signal, and transmits a trigger signal to the trigger unit when the voltage value of the detecting signal is bigger than a set voltage value. The trigger unit responds to the trigger signal to generate a driving signal so as to cut off the electrical connection between the three-phase power supply system and a load.
Description
Technical field
The utility model relates to the protection switch technical field, and particularly a kind of three-phase overvoltage detects protective device.
Background technology
Increasingly high along with social electrification degree, also just increasingly high for the requirement of safety utilization of electric power.At present, in the electricity consumption of family or industry spot was used, three-phase power supply system was vulnerable to the extraneous factor influence and causes the unusual of power-supply system.For example: load break down the load that forms three-phase system asymmetric or, wiring error or power-supply system go wrong, and like this, is prone to the overvoltage phenomenon.And the high pressure after the overvoltage can cause damage to power consumption equipment.
At present; Overvoltage protection for three-phase power supply system adopts separating switch protection more, and promptly three separate single-phase overvoltage detecting units detect a phase power source voltage respectively, when the overvoltage phenomenon appears in a phase power supply; Can cut off the electricity supply, the protection power consumption equipment is not damaged.
Thus it is clear that, need three single-phase overvoltages detection detecting units could realize that like this, not only the overvoltage crowbar of three-phase power supply system is complicated, and cost is also somewhat expensive for the overvoltage protection of three-phase power supply system.
The utility model content
The utility model provides a kind of three-phase overvoltage to detect protective device, in order to simplify the overvoltage crowbar of three-phase power supply system.
The utility model provides a kind of three-phase overvoltage to detect protective device, comprising: rectification unit, detecting unit and trigger element, wherein,
Said rectification unit comprises: three rectification circuits, and wherein, every rectification circuit carries out rectification with the cross streams voltage signal in the three-phase power supply system and handles the d. c. voltage signal that obtains correspondence, and exports to detecting unit;
Said detecting unit comprises: three sample circuits and a testing circuit; Wherein, after every sample circuit obtains one road d. c. voltage signal, carry out sampling processing; And the sampled signal after will handling is exported to said testing circuit; The maximum sampled signal of magnitude of voltage is confirmed as detection signal in three tunnel sampled signals that said testing circuit will receive, and when the magnitude of voltage of said detection signal during greater than setting voltage value, triggering signal is sent to said trigger element;
Said trigger element produces a drive signal in response to said triggering signal, to cut off the electrical connection of said three-phase power supply system to load.
According to the utility model execution mode; The three-phase overvoltage detects protective device earlier with being converted into corresponding dc signal after the every cross streams signal of telecommunication rectification in the three-phase power supply system, then, every road direct current carried out sampling processing after; The sampled signal that magnitude of voltage is maximum is confirmed as detection signal; And the magnitude of voltage and the setting voltage of detection signal compared, when the magnitude of voltage of this detection signal surpasses setting voltage, produce a drive signal through trigger element; Cutting off said three-phase power supply system, thereby realized overvoltage protection to the electrical connection of load.
According to the utility model execution mode; The sample circuit that the three-phase overvoltage detects protective device comprises: series connection bleeder circuit and filter circuit; Wherein, Said series connection bleeder circuit comprises at least three resistance, the d. c. voltage signal that obtains is carried out voltage division processing after, export to said filter circuit and carry out Filtering Processing.Like this, be converted into the less and galvanic current signal of magnitude of voltage, promptly obtain the less and stable sampled signal of magnitude of voltage through the sample circuit half-wave DC signal of telecommunication that peakedness ratio is bigger.
Negative electrode and the parallel connection of the RC between ground filter branch that filter circuit comprises diode and is connected this diode.
According to the utility model execution mode; The testing circuit that the three-phase overvoltage detects protective device comprises: isolating switch circuit and comparison circuit; Wherein, After said isolating switch circuit obtained three tunnel sampled signals, the sampled signal that magnitude of voltage is maximum was confirmed as detection signal, and exports to said comparison circuit; Said comparison circuit compares the magnitude of voltage and the set point of said detection signal, and when the magnitude of voltage of said detection signal during greater than setting voltage value, the output triggering signal is given said trigger element.
And the isolating switch circuit comprises: three diodes, and wherein, the anode of each diode is connected with the output of a sample circuit respectively; The negative electrode of each diode all is connected diode with the input of said comparison circuit.Sampled signal through the isolating switch circuit is maximum with magnitude of voltage is confirmed as detection signal, has realized the isolation of three tunnel sampled signals.
According to the utility model execution mode, comparison circuit comprises in the three-phase overvoltage detection protective device: the product of maturation on these markets such as voltage comparator or voltage checking chip, like this, lowered the three-phase overvoltage and detected the cost of protective device.
The trigger element that the three-phase overvoltage detects in the protective device comprises controllable silicon, and this silicon controlled trigger end is connected with the output of testing circuit, has realized Signal Spacing like this, a bit triggers, and has improved the fail safe that three-phase power supply system uses.In addition, the trigger element that this three-phase overvoltage detects protective device also can comprise: the twitter circuit that disappears, the defeated triggering signal to said testing circuit output of the said twitter circuit that disappears carries out exporting to the silicon controlled trigger end after the Filtering Processing.This twitter circuit that disappears can prevent the shake of triggering signal, and the precision that has guaranteed triggering signal is with level and smooth.
According to the utility model execution mode; Three road d. c. voltage signals that the three-phase overvoltage detects three rectification circuit outputs described in the protective device break off so that said three-phase power supply system arrives the electrical connection of load as the power supply that drives tripping mechanism with isolation method; Like this; Three-phase ac signal in the three-phase power supply system is independent of each other, and has further improved the fail safe of three-phase power supply system.
Description of drawings
Hereinafter will be with clear and definite understandable mode through to the explanation of preferred implementation and combine accompanying drawing to come the above-mentioned characteristic of the utility model, technical characterictic, advantage and execution mode thereof are further specified, wherein:
Fig. 1 is according to the utility model execution mode, and the three-phase overvoltage detects the sketch map of protective device structure;
Fig. 2 is according to the utility model execution mode, and the three-phase overvoltage detects the sketch map of sample circuit in the protective device;
Fig. 3 is according to the utility model execution mode, and the three-phase overvoltage detects the sketch map of testing circuit in the protective device;
Fig. 4 is according to the utility model embodiment, and the three-phase overvoltage detects the sketch map of protective device structure.
The reference symbol table
100 rectification units
101-103 first to the 3rd rectification circuit
200 detecting units
201-203 first to the 3rd sample circuit testing circuit 204
210 series connection bleeder circuits
220 filter circuits
230 isolating switch circuit
240 comparison circuits
300 trigger elements
The D diode
C electric capacity
R resistance
The L coil
The U integrated chip
Embodiment
Be the technical characterictic to the utility model, purpose and effect have more clearly to be understood, and contrasts the embodiment of description of drawings the utility model at present, and identical label is represented identical part in each figure.Be the structure and the correlation thereof of clear each parts of expression, the proportionate relationship of each parts is merely schematically in the accompanying drawing, does not represent the proportionate relationship of practical structures.In addition, said " first ", " second " or " the 3rd " etc. only are used to distinguish each parts before the relevant title of specification, identify the relative position relation of each parts, do not represent absolute position, installation steps and the relative importance of parts.
Fig. 1 is that a kind of three-phase overvoltage of the utility model detects protective device, comprising: rectification unit 100, detecting unit 200 and trigger element 300, wherein,
Cross streams voltage signal output end in the corresponding three-phase power supply system of the input of every rectification circuit.Have 120 ° differ between each cross streams voltage signal in the three-phase power supply system, therefore, after rectification unit 100 rectifications, there are 120 ° of d. c. voltage signals that differ in three rectification circuits outputs.
Rectification circuit generally is constituted by a diode, and this diode can carry out halfwave rectifier to ac voltage signal, obtains d. c. voltage signal, and d. c. voltage signal is generally the half-wave DC voltage signal here.The peak value of this half-wave DC voltage signal is also bigger.For example: the peak value that obtains the half-wave DC voltage signal in the used electrical network of existing family after the rectification is 110V.
Detecting unit 200 comprises: three sample circuit 201-203 and a testing circuit 204, wherein, after every sample circuit obtains one road d. c. voltage signal, carry out sampling processing, and the sampled signal after will handling is exported to testing circuit 204.This testing circuit 204 can obtain three tunnel sampled signals like this, and wherein the maximum sampled signal of magnitude of voltage is confirmed as detection signal.When the magnitude of voltage of detection signal during greater than setting voltage value, comparison circuit sends a triggering signal to trigger element 300.
Here, three sample circuits are respectively first sample circuit, 201, the second sample circuits 202, and the 3rd sample circuit 203.The input of every sample circuit is corresponding with a rectification circuit output end in the rectification unit 100.For example: first sample circuit 201 is connected with first rectification circuit 101, and second sample circuit 202 is connected 102, the three sample circuits 203 and is connected with the 3rd rectification circuit 103 with second rectification circuit.
Like this, every sample circuit obtains d. c. voltage signal from the rectification circuit of correspondence, and carries out sampling processing, obtains the magnitude of voltage galvanic current and presses signal, i.e. sampled signal.Because every sample circuit obtains d. c. voltage signal and is generally the bigger half-wave DC voltage signal of peak value,, can obtain the less and galvanic current pressure signal of magnitude of voltage through after the sampling processing.For example: sample circuit can be that the half-wave DC voltage signal of 110V transfers the constant sampled signal of magnitude of voltage to peak value, and preferably, the magnitude of voltage of this sampled signal is less than 5V, for example: 4V, 3V.
After three sampled signals that testing circuit 204 obtains, the sampled signal that magnitude of voltage is maximum is confirmed as detection signal, and when the magnitude of voltage of detection signal during greater than setting voltage value, a triggering signal is sent to trigger element 300.The magnitude of voltage and the setting voltage value that are about to definite detection signal compare, and give trigger element 300 according to comparative result output high level or low level.For example: when the value of the detection signal of confirming during greater than setting voltage value; This testing circuit 204 output high level, i.e. effective trigger signals is when the value of the detection signal that obtains during less than setting voltage value; These testing circuit 204 output low levels, promptly invalid triggering signal.Can certainly be in contrast.
Among the utility model embodiment, this three-phase overvoltage detects protective device can unite use with circuit breaker, carries out overvoltage protection.The trigger element 300 that detects protective device in the three-phase overvoltage is connected to a tripping mechanism, and the drive signal that trigger element 300 produces can drive this tripping mechanism action, and makes circuit breaker break off the electrical connection from the three-phase power supply system to the load thus.Wherein tripping mechanism can comprise a tripping coil.Tripping coil is connected with the controllable silicon in the trigger element in one embodiment, and controllable silicon is in normally open, after controllable silicon is triggered, and the controllable silicon conducting, thus the tripping coil of series connection can be because of getting the electric action of threading off of carrying out with it.Preferably; In order to ensure safety; For example directly after the output parallel connection with three rectification circuits (for example, the d. c. voltage signal of No. three rectification circuits output connects with the mode that is isolated from each other, and is the drive circuitry of tripping mechanism) as the power supply that is used to drive tripping mechanism.For example, be connected an end of tripping coil after the output parallel connection of three rectification circuits, the other end of tripping coil is through trigger element 300 ground connection.Such benefit is, though certain phase power supply failover and power down, in case other two arbitraryly in mutually overvoltage occurs, tripping mechanism still electric and carry out the action of threading off.
Like this; The magnitude of voltage of confirming detection signals when comparison circuit 240 is during greater than setting voltage value; Triggering signal is sent to trigger element 300, and trigger element 300 produces a drive signal in response to this triggering signal, carry out the action of threading off to impel tripping coil; Break off the switch of three phase mains, thereby realized overvoltage protection to load circuit.
Among the utility model embodiment; Article three, the d. c. voltage signal of the output of rectification circuit also can be respectively through a parallelly connected again end that is linked into tripping coil behind the diode; The every road d. c. voltage signal that is rectification unit 100 outputs is connected with the anode of a diode respectively; Be connected with an end of tripping coil after the negative electrode parallel connection of each diode, the other end of coil is connected with ground through trigger element 300.Like this, when overvoltage appears in a phase power supply, the diode current flow that is connected with this, other two diodes end, and have realized the isolation of signal, have improved the stability of cutting off circuit, have also further improved the accuracy rate of overvoltage protection.
In the above-described embodiments, every sample circuit in the detecting unit 200 all is the same, as shown in Figure 2, and sample circuit comprises: series connection bleeder circuit 210 and filter circuit 220.Wherein,
Become series connection bleeder circuit 210 by at least three resistor group, two resistance series connection are arranged, also can carry out dividing potential drop; It is the less half-wave DC signal of telecommunication of peak value that but the half-wave DC signal of telecommunication that must peakedness ratio is bigger among the utility model embodiment changes dividing potential drop, like this, and during two resistance; Power can be bigger; Therefore, preferably need three, four or more a plurality of resistance string joint group one-tenth series connection bleeder circuit.In as shown in Figure 2, the series connection bleeder circuit comprises: three resistance are respectively R1, R2, R3.
Series connection bleeder circuit 210 is exported to filter circuit 220 and is carried out Filtering Processing after the d. c. voltage signal that obtains is carried out voltage division processing.Therefore, after the voltage division processing through series connection bleeder circuit 210, the peakedness ratio of the half-wave DC signal of telecommunication of filter circuit 220 two ends input is less.For example: the peak value of the input half-wave DC signal of telecommunication at filter circuit 220 two ends is less than 5V.Through the dividing potential drop of series connection bleeder circuit 210, the input at filter circuit 220 two ends be the less half-wave DC signal of telecommunication of peak value, obtain the little and galvanic current signal of magnitudes of voltage through filter circuit 200.
In as shown in Figure 2; Negative electrode and the parallel connection of the RC between ground filter branch that filter circuit 220 comprises diode and is connected this diode, promptly filter circuit 220 comprises: diode D1, capacitor C 1; And resistance R 4; Wherein, capacitor C 1 is connected other end ground connection with resistance R 4 parallel connection backs one end with the negative electrode of diode D1.
In the above-described embodiments, the testing circuit 204 in the detecting unit 200 is as shown in Figure 3, comprising: isolating switch circuit 230 and comparison circuit 240, wherein,
After isolating switch circuit 230 obtained three tunnel sampled signals, the sampled signal that magnitude of voltage is maximum was confirmed as detection signal, and exports to comparison circuit 240; And comparison circuit 240 compares the magnitude of voltage and the set point of detection signal, and when the magnitude of voltage of detection signal during greater than setting voltage value, the output triggering signal is given trigger element 300.
As shown in Figure 3, three diodes of isolating switch circuit 230 are respectively D1, D2 and D3, and wherein, the anode of each diode is connected with the output of a sample circuit respectively; The negative electrode of each diode all is connected with the input of comparison circuit 240.
When the magnitude of voltage of the sampled signal of the output of three sample circuits unequal; Wherein, the magnitude of voltage of the sampled signal of the output of a sample circuit is maximum, then connected diode current flow; And other diode ends; Therefore, behind isolating switch circuit 230, the maximum sampled signal of magnitude of voltage is imported in the comparison circuit 240.
When the magnitude of voltage of the sampled signal of the output of three sample circuits equated, then three diodes all ended, and no detection signal is imported in the comparison circuit 240.
In the foregoing description, the trigger element 300 that the three-phase overvoltage detects in the protective device can trigger or the low level triggering by high level, and generally this trigger element 300 comprises controllable silicon; But be not limited thereto among the utility model embodiment; This trigger element 300 also comprises the twitter circuit that disappears, and this twitter circuit that disappears carries out exporting to the silicon controlled trigger end after the Filtering Processing to the triggering signal of testing circuit 204 outputs, like this; Can prevent the shake of triggering signal, the precision that has guaranteed triggering signal is with level and smooth.The twitter circuit that disappears can be made up of parallel resistor and electric capacity.
Sample circuit has only been described in the foregoing description; And a kind of physical circuit form of testing circuit; But the utility model embodiment is not limited thereto, and other have sampling, and the circuit of functions such as isolation also can be used as sample circuit or the testing circuit among the utility model embodiment.
Below in conjunction with Figure of description the utility model embodiment is described in further detail.
Referring to Fig. 4, in the present embodiment, the three-phase alternating voltage of three-phase power supply system is respectively Ua, Ub, Uc.The ac voltage signal of Ua output is difference input diode D1 after diode D4 carries out the rectification processing, and among the R1.The ac voltage signal of Ub output is difference input diode D2 after diode D5 carries out the rectification processing, and among the R6.The ac voltage signal of Uc output is difference input diode D3 after diode D6 carries out the rectification processing, and among the R11.
Be that example is described with the realization overvoltage protection behind the A commutating phase below, R1, R2, R3 and R4 series connection, the series connection bleeder circuit in the sample circuit of composition three-phase overvoltage detection protective device.Diode D7, capacitor C 1, and the filter circuit in the sample circuit of resistance R 5 compositions, this filter circuit is parallelly connected with R4.In this filter circuit, capacitor C 1 is connected with the negative electrode of diode D7 with resistance R 5 parallel connection backs, and like this, D7, obtains the magnitude of voltage galvanic current and presses signal, i.e. sampled signal to charging capacitor C 1 folk prescription.
After A overvoltage occurred mutually, the magnitude of voltage of the corresponding sampled signal of A was respectively greater than the B phase, and the corresponding sampled signal of C, therefore, and D8 conducting, and D10, and D12 ends, at this moment, the corresponding sampled signal of A is among the detection signal input comparison circuit U1.
Promptly this detection signal inserts the input of comparison circuit U1 through the diode D8 in the isolating switch circuit.Here, comparison circuit UI is S80145, and the reference voltage of this testing circuit is generally 4.5V, and promptly setting voltage value is 4.5V in the present embodiment.
At this moment, the magnitude of voltage of detection signal is during greater than 4.5V, and S80145 output triggering signal is given trigger element, and triggering signal is a high level here.Trigger element comprises: controllable silicon U2, and the twitter circuit that disappears.This twitter circuit that disappears is made up of the R16 and the C4 of parallel connection.Triggering signal is through the trigger end of the input controllable silicon U2 behind the twitter circuit of disappearing like this.
Since after the negative electrode parallel connection of diode D1, D2 and D3 with tripping mechanism in the end of tripping coil L1 be connected, the other end of tripping coil L1 is connected with controllable silicon U2.Like this, and since the overvoltage of A phase, the D1 conducting, D2 and D3 end, controllable silicon U2 conducting, and tripping coil L1 carries out the action of threading off, thereby, make circuit breaker break off the electrical connection from the three-phase power supply system to the load, thereby, realized overvoltage protection.
The overvoltage protection of B, C phase is identical with said process, just no longer tired having stated.
In the above-described embodiments, respectively through a parallelly connected again end that inserts the tripping coil of circuit breaker behind the diode, the other end of this tripping coil is connected with ground through controllable silicon U2 after the three-phase ac signal rectification of three-phase power supply system output.Like this, controllable silicon U2 shows a phase power supply overvoltage after triggering, the diode current flow corresponding with this, thus tripping coil is carried out the action of threading off, and makes circuit breaker break off the electrical connection from the three-phase power supply system to the load.Because; Be connected with an end of coil through parallel connection behind the diode respectively after the three-phase ac signal rectification, like this, when overvoltage appears in any phase power supply in the three-phase power supply system; All can cut off load circuit; And, therefore, can not cause damage to other two-phase power supplies owing to end with other two corresponding diodes.
Certainly, the utility model embodiment is not limited thereto, a directly parallelly connected end that inserts tripping coil after the three-phase ac signal rectification of three-phase power supply system output, and the other end of this tripping coil is connected with ground through controllable silicon U2; Perhaps, be connected with an end of tripping coil through a diode behind any cross streams signal rectification of three-phase power supply system output, the other end of this tripping coil is connected with ground through controllable silicon U2; Perhaps, an end of straight make and break tripping coil connects behind any cross streams signal rectification of three-phase power supply system output, and the other end of this tripping coil is connected with ground through controllable silicon U2.
The utility model execution mode; The three-phase overvoltage detects protective device earlier with being converted into corresponding dc signal after the every cross streams signal of telecommunication rectification in the three-phase power supply system, then, every road direct current adopted processing after; Just the maximum sampled signal of magnitude of voltage is confirmed as detection signal; And the magnitude of voltage and the setting voltage of detection signal compared, when the magnitude of voltage of this detection signal surpasses setting voltage, produce a drive signal through trigger element; Cutting off said three-phase power supply system, thereby realized overvoltage protection to the electrical connection of load.
And the three-phase overvoltage detects protective device can obtain the corresponding sampled signal of every cross streams signal of telecommunication in the three-phase power supply system respectively, and before input detecting circuit; Isolate; Only that magnitude of voltage is maximum sampled signal is confirmed as detection signal, like this, only needs one tunnel sampled signal and setting voltage value are compared; Just can realize overvoltage protection, simplify circuit.
In addition; After the three-phase ac signal rectification of three-phase power supply system output respectively through behind the diode again parallel connection be connected with tripping coil in the tripping mechanism; Like this; Carried out the isolation of signal, the three-phase ac signal in the three-phase power supply system is independent of each other, and has further improved the fail safe of three-phase power supply system.
Preceding text have carried out detail and explanation through accompanying drawing and preferred implementation to the utility model; Yet the utility model is not limited to these execution modes that has disclosed, and other scheme that those skilled in the art therefrom derive out is also within the protection range of the utility model.
Claims (10)
1. a three-phase overvoltage detects protective device, comprising: rectification unit (100), detecting unit (200) and trigger element (300), wherein,
Said rectification unit (100) comprising: three rectification circuits, and wherein, every rectification circuit carries out rectification with the cross streams voltage signal in the three-phase power supply system and handles the d. c. voltage signal that obtains correspondence, and exports to detecting unit (200);
Said detecting unit (200) comprising: three sample circuits and a testing circuit (204); Wherein, After every sample circuit obtains one road d. c. voltage signal; Carry out sampling processing, and the sampled signal after will handling exports to said testing circuit (204), the maximum sampled signal of magnitude of voltage is confirmed as detection signal in three tunnel sampled signals that said testing circuit (204) will receive; And, triggering signal is sent to said trigger element (300) when the magnitude of voltage of said detection signal during greater than setting voltage value;
Said trigger element (300) produces a drive signal in response to said triggering signal, to cut off the electrical connection of said three-phase power supply system to load.
2. device as claimed in claim 1, said sample circuit comprises: series connection bleeder circuit (210) and filter circuit (220); Wherein,
Said series connection bleeder circuit (210) comprises at least three resistance, the d. c. voltage signal that obtains is carried out voltage division processing after, export to said filter circuit (220) and carry out Filtering Processing.
3. negative electrode and the parallel connection of the RC between ground filter branch that device as claimed in claim 2, wherein said filter circuit (220) comprise diode and be connected this diode.
4. device as claimed in claim 1, said testing circuit (204) comprising: isolating switch circuit (230) and comparison circuit (240), wherein,
After said isolating switch circuit (230) obtained three tunnel sampled signals, the sampled signal that magnitude of voltage is maximum was confirmed as detection signal, and exports to said comparison circuit (240);
Said comparison circuit (240) compares the magnitude of voltage and the set point of said detection signal, and when the magnitude of voltage of said detection signal during greater than setting voltage value, the output triggering signal is given said trigger element (300).
5. device as claimed in claim 4, said isolating switch circuit (230) comprising: three diodes, wherein,
The anode of each diode is connected with the output of a sample circuit respectively;
The negative electrode of each diode all is connected with the input of said comparison circuit (240).
6. device as claimed in claim 4, said comparison circuit (240) comprising: voltage comparator or voltage checking chip.
7. device as claimed in claim 1; Said trigger element (300) comprising: controllable silicon; Said silicon controlled trigger end is connected with the output of said testing circuit (204), in response to said triggering signal, and said controllable silicon conducting; So that drive signal to be provided, make said three-phase power supply system break off to the electrical connection of load.
8. device as claimed in claim 7, said trigger element (300) also comprises: the twitter circuit that disappears, the said twitter circuit that disappears carries out exporting to said silicon controlled trigger end after the Filtering Processing to the triggering signal of said testing circuit (204) output.
9. device as claimed in claim 8, the said twitter circuit that disappears comprises: parallel resistor and electric capacity.
10. device as claimed in claim 1, three road d. c. voltage signals of wherein said three rectification circuits output are to make said three-phase power supply system supply power to the mechanism that the electrical connection of load is broken off with the mode that is isolated from each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202268971U CN202167825U (en) | 2011-06-29 | 2011-06-29 | Three-phase overvoltage detection protective device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202268971U CN202167825U (en) | 2011-06-29 | 2011-06-29 | Three-phase overvoltage detection protective device |
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| CN202167825U true CN202167825U (en) | 2012-03-14 |
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| CN2011202268971U Expired - Lifetime CN202167825U (en) | 2011-06-29 | 2011-06-29 | Three-phase overvoltage detection protective device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513091A (en) * | 2013-10-12 | 2014-01-15 | 河南开启电力实业有限公司 | Abnormal overcurrent on-line detection device |
| CN107246703A (en) * | 2016-11-18 | 2017-10-13 | 奥克斯空调股份有限公司 | A kind of air-conditioning with error connection defencive function |
| CN111122955A (en) * | 2018-10-31 | 2020-05-08 | 宁波方太厨具有限公司 | Overvoltage detection circuit applied to range hood |
| US11456677B2 (en) | 2020-12-10 | 2022-09-27 | Rolls-Royce Corporation | Power converter protection circuit |
-
2011
- 2011-06-29 CN CN2011202268971U patent/CN202167825U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513091A (en) * | 2013-10-12 | 2014-01-15 | 河南开启电力实业有限公司 | Abnormal overcurrent on-line detection device |
| CN107246703A (en) * | 2016-11-18 | 2017-10-13 | 奥克斯空调股份有限公司 | A kind of air-conditioning with error connection defencive function |
| CN111122955A (en) * | 2018-10-31 | 2020-05-08 | 宁波方太厨具有限公司 | Overvoltage detection circuit applied to range hood |
| CN111122955B (en) * | 2018-10-31 | 2021-10-01 | 宁波方太厨具有限公司 | Overvoltage detection circuit applied to range hood |
| US11456677B2 (en) | 2020-12-10 | 2022-09-27 | Rolls-Royce Corporation | Power converter protection circuit |
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