CN204203345U - A kind of voltage detecting circuit - Google Patents
A kind of voltage detecting circuit Download PDFInfo
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- CN204203345U CN204203345U CN201420753617.6U CN201420753617U CN204203345U CN 204203345 U CN204203345 U CN 204203345U CN 201420753617 U CN201420753617 U CN 201420753617U CN 204203345 U CN204203345 U CN 204203345U
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Abstract
The utility model provides a kind of voltage detecting circuit, comprise the first testing circuit, whether the three-phase voltage for detecting conventional power supply there is phase shortage, decompression or under-voltage, and the voltage of the arbitrary phase line of conventional power supply all do not occur phase shortage, decompression or under-voltage time conducting, the first signal is exported to double power supply automatic transfer switch, otherwise cut-off, does not export the first signal to double power supply automatic transfer switch; Second testing circuit, whether the three-phase voltage for detecting standby power supply there is phase shortage, decompression or under-voltage, and the voltage of the arbitrary phase line of standby power supply all do not occur phase shortage, decompression or under-voltage time conducting, secondary signal is exported to double power supply automatic transfer switch, otherwise cut-off, does not export described secondary signal to double power supply automatic transfer switch.Thus provide the voltage detecting circuit for double power supply automatic transfer switch that a kind of circuit is simple, control is accurate, antijamming capability is strong.
Description
Technical field
The utility model relates to power supply technique field.Relate in particular to a kind of voltage detecting circuit for double power supply automatic transfer switch.
Background technology
ATS also claims ATSE, and be the english abbreviation of Automatic transfer Switching equipment, Chinese full name is automatic transfer switching electric appliance, is commonly called as double power supply automatic transfer switch.The GB standard of ATS product is defined as and is made up of one (or several) transfer switching equipment and other required electrical equipment, for detecting power circuit, and conventional supply voltage generation phase shortage, decompression or under-voltage time, one or more load circuit is transformed into automatically the electrical equipment of standby power supply from the conventional power supply broken down.Ensure that reliability and the security of power supply.Be widely used in the important place that skyscraper, community, hospital, airport, harbour, fire-fighting, metallurgy, chemical industry, weaving etc. do not allow to have a power failure, unmanned can be realized and power continuously.
In prior art, voltage detecting circuit one for double power supply automatic transfer switch utilizes mutual inductor whether to there occurs phase shortage, decompression or under-voltage in conjunction with discharge circuit to detect power circuit voltage, but it is high that shortcoming is cost, circuit is complicated, and the volume taken is larger; Another kind utilizes optocoupler whether to there occurs phase shortage, decompression or under-voltage to detect power circuit voltage, Power convert is controlled again in conjunction with 555 timers and peripheral mimic channel, but it is easily non-linear that shortcoming is optocoupler, or the erroneous judgement by accuracy of detection deviation can be made after temperature drift comparatively large, the components and parts of mimic channel are many, busy line plate area is large, and the probability broken down is high, and signal controls to be subject to electromagnetic interference (EMI).
Utility model content
For this reason, technical problem to be solved in the utility model is the voltage detecting circuit for double power supply automatic transfer switch of the prior art, circuit is complicated, volume is large, the probability that breaks down is high, be subject to electromagnetic interference (EMI), thus provides the voltage detecting circuit for double power supply automatic transfer switch that a kind of circuit is simple, control is accurate, antijamming capability is strong.
For solving the problems of the technologies described above, the technical solution of the utility model is as follows:
The utility model provides a kind of voltage detecting circuit, comprising:
First testing circuit, whether the three-phase voltage for detecting conventional power supply there is phase shortage, decompression or under-voltage, and the voltage of the arbitrary phase line of described conventional power supply all do not occur phase shortage, decompression or under-voltage time conducting, the first signal is exported to double power supply automatic transfer switch, otherwise cut-off, does not export described first signal to described double power supply automatic transfer switch;
Second testing circuit, whether the three-phase voltage for detecting standby power supply there is phase shortage, decompression or under-voltage, and the voltage of the arbitrary phase line of described standby power supply all do not occur phase shortage, decompression or under-voltage time conducting, secondary signal is exported to described double power supply automatic transfer switch, otherwise cut-off, does not export described secondary signal to described double power supply automatic transfer switch.
Voltage detecting circuit described in the utility model, described first testing circuit comprises: the first detecting unit, whether the A phase voltage for detecting described conventional power supply there is phase shortage, decompression or under-voltage, and it comprises the first rectification chip U1, the first divider resistance R13, the second divider resistance R19, the first power monitoring chip U7 and the first opto-coupler chip G1;
Described first rectification chip U1 two input ends couple with the live wire of the A phase of described conventional power supply and zero line respectively, the live wire of the A phase of described conventional power supply is become after direct current with the AC rectification between zero line and exports, the forward voltage output terminal of described first rectification chip U1 and one end of described first divider resistance R13 couple, the other end of described first divider resistance R13 after described second divider resistance R19 with the ground terminal of described first power monitoring chip U7, common port after the first input end of described first power monitoring chip U7 is connected with the second input end and between described first divider resistance R13 and described second divider resistance R19 couples, the positive terminal of the illuminator in the output terminal of described first power monitoring chip U7 and described first opto-coupler chip G1 couples, the negative pole end ground connection of the illuminator in described first opto-coupler chip G1, the input termination high level of the light-receiving device in described first opto-coupler chip G1,
When the A phase voltage of described conventional power supply do not occur phase shortage, decompression or under-voltage time, the forward voltage output terminal of described first rectification chip U1 exports high level, first input end and second input end of described first power monitoring chip U7 is transferred to after described first divider resistance R13 dividing potential drop, the output terminal of described first power monitoring chip U7 is made to export high level, now, illuminator conducting in described first opto-coupler chip G1 is luminous, makes the light-receiving device conducting in described first opto-coupler chip G1; Otherwise, the light-receiving device cut-off in described first opto-coupler chip G1.
Voltage detecting circuit described in the utility model, described first testing circuit also comprises: the second detecting unit, whether the B phase voltage for detecting described conventional power supply there is phase shortage, decompression or under-voltage, and it comprises the second rectification chip U2, the 3rd divider resistance R14, the 4th divider resistance R20, second source monitoring chip U8 and the second opto-coupler chip G2;
Described second rectification chip U2 two input ends couple with the live wire of the B phase of described conventional power supply and zero line respectively, the live wire of the B phase of described conventional power supply is become after direct current with the AC rectification between zero line and exports, the forward voltage output terminal of described second rectification chip U2 and one end of described 3rd divider resistance R14 couple, the other end of described 3rd divider resistance R14 after described 4th divider resistance R20 with the ground terminal of described second source monitoring chip U8, common port after the first input end of described second source monitoring chip U8 is connected with the second input end and between described 3rd divider resistance R14 and described 4th divider resistance R20 couples, the positive terminal of the illuminator in the output terminal of described second source monitoring chip U8 and described second opto-coupler chip G2 couples, the negative pole end ground connection of the illuminator in described second opto-coupler chip G2, the output terminal of the light-receiving device in the input end of the light-receiving device in described second opto-coupler chip G2 and described first opto-coupler chip G1 couples,
When the A phase voltage of described conventional power supply and B phase voltage all do not occur phase shortage, decompression or under-voltage time, the forward voltage output terminal of described second rectification chip U2 exports high level, first input end and second input end of described second source monitoring chip U8 is transferred to after described 3rd divider resistance R14 dividing potential drop, the output terminal of described second source monitoring chip U8 is made to export high level, now, illuminator conducting in described second opto-coupler chip G2 is luminous, makes the light-receiving device conducting in described second opto-coupler chip G2; Otherwise, the light-receiving device cut-off in described second opto-coupler chip G2.
Voltage detecting circuit described in the utility model, described first testing circuit also comprises: the 3rd detecting unit, whether the C phase voltage for detecting described conventional power supply there is phase shortage, decompression or under-voltage, and it comprises the 3rd rectification chip U3, the 5th divider resistance R15, the 6th divider resistance R21, the 3rd power monitoring chip U9 and the 3rd opto-coupler chip G3;
Described 3rd rectification chip U3 two input ends couple with the live wire of the C phase of described conventional power supply and zero line respectively, the live wire of the C phase of described conventional power supply is become after direct current with the AC rectification between zero line and exports, the forward voltage output terminal of described 3rd rectification chip U3 and one end of described 5th divider resistance R15 couple, the other end of described 5th divider resistance R15 after described 6th divider resistance R21 with the ground terminal of described 3rd power monitoring chip U9, common port after the first input end of described 3rd power monitoring chip U9 is connected with the second input end and between described 5th divider resistance R15 and described 6th divider resistance R21 couples, the positive terminal of the illuminator in the output terminal of described 3rd power monitoring chip U9 and described 3rd opto-coupler chip G3 couples, the negative pole end ground connection of the illuminator in described 3rd opto-coupler chip G3, the output terminal of the light-receiving device in the input end of the light-receiving device in described 3rd opto-coupler chip G3 and described second opto-coupler chip G2 couples,
When the A phase voltage of described conventional power supply, B phase voltage and C phase voltage all do not occur phase shortage, decompression or under-voltage time, the forward voltage output terminal of described 3rd rectification chip U3 exports high level, first input end and second input end of described 3rd power monitoring chip U9 is transferred to after described 5th divider resistance R15 dividing potential drop, the output terminal of described 3rd power monitoring chip U9 is made to export high level, now, illuminator conducting in described 3rd opto-coupler chip G3 is luminous, makes the light-receiving device conducting in described 3rd opto-coupler chip G3; Otherwise the light-receiving device cut-off in described 3rd opto-coupler chip G3, the output terminal of the light-receiving device in described 3rd opto-coupler chip G3 is the output terminal of described first testing circuit, for exporting described first signal to described double power supply automatic transfer switch.
Voltage detecting circuit described in the utility model, described second testing circuit comprises: the 4th detecting unit, whether the A phase voltage for detecting described standby power supply there is phase shortage, decompression or under-voltage, and it comprises the 4th rectification chip U4, the 7th divider resistance R16, the 8th divider resistance R22, the 4th power monitoring chip U10 and the 4th opto-coupler chip G4;
Described 4th rectification chip U4 two input ends couple with the live wire of the A phase of described standby power supply and zero line respectively, the live wire of the A phase of described standby power supply is become after direct current with the AC rectification between zero line and exports, the forward voltage output terminal of described 4th rectification chip U4 and one end of described 7th divider resistance R16 couple, the other end of described 7th divider resistance R16 after described 8th divider resistance R22 with the ground terminal of described 4th power monitoring chip U10, common port after the first input end of described 4th power monitoring chip U10 is connected with the second input end and between described 7th divider resistance R16 and described 8th divider resistance R22 couples, the positive terminal of the illuminator in the output terminal of described 4th power monitoring chip U10 and described 4th opto-coupler chip G4 couples, the negative pole end ground connection of the illuminator in described 4th opto-coupler chip G4, the input termination high level of the light-receiving device in described 4th opto-coupler chip G4,
When the A phase voltage of described standby power supply do not occur phase shortage, decompression or under-voltage time, the forward voltage output terminal of described 4th rectification chip U4 exports high level, first input end and second input end of described 4th power monitoring chip U10 is transferred to after described 7th divider resistance R16 dividing potential drop, the output terminal of described 4th power monitoring chip U10 is made to export high level, now, illuminator conducting in described 4th opto-coupler chip G4 is luminous, makes the light-receiving device conducting in described 4th opto-coupler chip G4; Otherwise, the light-receiving device cut-off in described 4th opto-coupler chip G4.
Voltage detecting circuit described in the utility model, described second testing circuit also comprises: the 5th detecting unit, whether the B phase voltage for detecting described standby power supply there is phase shortage, decompression or under-voltage, and it comprises the 5th rectification chip U5, the 9th divider resistance R17, the tenth point of piezoresistance R23, the 5th power monitoring chip U11 and the 5th opto-coupler chip G5;
Described 5th rectification chip U5 two input ends couple with the live wire of the B phase of described standby power supply and zero line respectively, the live wire of the B phase of described standby power supply is become after direct current with the AC rectification between zero line and exports, the forward voltage output terminal of described 5th rectification chip U5 and one end of described 9th divider resistance R17 couple, the other end of described 9th divider resistance R17 after the described ten point of piezoresistance R23 with the ground terminal of described 5th power monitoring chip U11, common port after the first input end of described 5th power monitoring chip U11 is connected with the second input end and between described 9th divider resistance R17 and the described ten point piezoresistance R23 couples, the positive terminal of the illuminator in the output terminal of described 5th power monitoring chip U11 and described 5th opto-coupler chip G5 couples, the negative pole end ground connection of the illuminator in described 5th opto-coupler chip G5, the output terminal of the light-receiving device in the input end of the light-receiving device in described 5th opto-coupler chip G5 and described 4th opto-coupler chip G4 couples,
When the A phase voltage of described standby power supply and B phase voltage all do not occur phase shortage, decompression or under-voltage time, the forward voltage output terminal of described 5th rectification chip U5 exports high level, first input end and second input end of described 5th power monitoring chip U11 is transferred to after described 9th divider resistance R17 dividing potential drop, the output terminal of described 5th power monitoring chip U11 is made to export high level, now, illuminator conducting in described 5th opto-coupler chip G5 is luminous, makes the light-receiving device conducting in described 5th opto-coupler chip G5; Otherwise, the light-receiving device cut-off in described 5th opto-coupler chip G5.
Voltage detecting circuit described in the utility model, described second testing circuit also comprises: the 6th detecting unit, whether the C phase voltage for detecting described standby power supply there is phase shortage, decompression or under-voltage, and it comprises the 6th rectification chip U6, the 11 divider resistance R18, the 12 divider resistance R24, the 6th power monitoring chip U12 and the 6th opto-coupler chip G6;
Described 6th rectification chip U6 two input ends couple with the live wire of the C phase of described standby power supply and zero line respectively, the live wire of the C phase of described standby power supply is become after direct current with the AC rectification between zero line and exports, the forward voltage output terminal of described 6th rectification chip U6 and one end of described 11 divider resistance R18 couple, the other end of described 11 divider resistance R18 after described 12 divider resistance R24 with the ground terminal of described 6th power monitoring chip U12, common port after the first input end of described 6th power monitoring chip U12 is connected with the second input end and between described 11 divider resistance R18 and described 12 divider resistance R24 couples, the positive terminal of the illuminator in the output terminal of described 6th power monitoring chip U12 and described 6th opto-coupler chip G6 couples, the negative pole end ground connection of the illuminator in described 6th opto-coupler chip G6, the output terminal of the light-receiving device in the input end of the light-receiving device in described 6th opto-coupler chip G6 and described 5th opto-coupler chip G5 couples,
When the A phase voltage of described standby power supply, B phase voltage and C phase voltage all do not occur phase shortage, decompression or under-voltage time, the forward voltage output terminal of described 6th rectification chip U6 exports high level, first input end and second input end of described 6th power monitoring chip U12 is transferred to after described 11 divider resistance R18 dividing potential drop, the output terminal of described 6th power monitoring chip U12 is made to export high level, now, illuminator conducting in described 6th opto-coupler chip G6 is luminous, makes the light-receiving device conducting in described 6th opto-coupler chip G6; Otherwise the light-receiving device cut-off of described 6th opto-coupler chip G6, the output terminal of the light-receiving device in described 6th opto-coupler chip G6 is the output terminal of described second testing circuit, for exporting described secondary signal to described double power supply automatic transfer switch.
Technique scheme of the present utility model has the following advantages compared to existing technology:
The utility model provides a kind of voltage detecting circuit, comprise the first testing circuit, whether the three-phase voltage for detecting conventional power supply there is phase shortage, decompression or under-voltage, and the voltage of the arbitrary phase line of conventional power supply all do not occur phase shortage, decompression or under-voltage time conducting, the first signal is exported to double power supply automatic transfer switch, otherwise cut-off, does not export the first signal to double power supply automatic transfer switch; Second testing circuit, whether the three-phase voltage for detecting standby power supply there is phase shortage, decompression or under-voltage, and the voltage of the arbitrary phase line of standby power supply all do not occur phase shortage, decompression or under-voltage time conducting, secondary signal is exported to double power supply automatic transfer switch, otherwise cut-off, does not export described secondary signal to double power supply automatic transfer switch.When conventional power supply puts into operation, if double power supply automatic transfer switch does not receive the first signal, then disconnect conventional power supply, enable standby power supply, when in-put of spare power supply runs, if double power supply automatic transfer switch does not receive secondary signal, then disconnect standby power supply, enable conventional power supply, thus provide the voltage detecting circuit for double power supply automatic transfer switch that a kind of circuit is simple, control is accurate, antijamming capability is strong.
Accompanying drawing explanation
In order to make content of the present utility model be more likely to be clearly understood, below according to specific embodiment of the utility model also by reference to the accompanying drawings, the utility model is described in further detail, wherein
Fig. 1 is the structured flowchart of voltage detecting circuit described in the utility model;
Fig. 2 is the circuit theory diagrams of the first testing circuit in voltage detecting circuit described in the utility model;
Fig. 3 is the circuit theory diagrams of the second testing circuit in voltage detecting circuit described in the utility model.
In figure, Reference numeral is expressed as: 1-first testing circuit, 2-commonly uses power supply, 3-double power supply automatic transfer switch, 4-second testing circuit, 5-standby power supply, 6-load, 11-first detecting unit, 12-second detecting unit, 13-the 3rd detecting unit, 41-the 4th detecting unit, 42-the 5th detecting unit, 43-the 6th detecting unit.
Embodiment
Present embodiments provide a kind of voltage detecting circuit, as shown in Figure 1, comprising:
First testing circuit 1, whether the three-phase voltage for detecting conventional power supply 2 there is phase shortage, decompression or under-voltage, and the voltage of the arbitrary phase line of described conventional power supply 2 all do not occur phase shortage, decompression or under-voltage time conducting, the first signal is exported to double power supply automatic transfer switch 3, otherwise cut-off, does not export described first signal to described double power supply automatic transfer switch 3;
Second testing circuit 4, whether the three-phase voltage for detecting standby power supply 5 there is phase shortage, decompression or under-voltage, and the voltage of the arbitrary phase line of described standby power supply 5 all do not occur phase shortage, decompression or under-voltage time conducting, secondary signal is exported to described double power supply automatic transfer switch 3, otherwise cut-off, does not export described secondary signal to described double power supply automatic transfer switch 3.
Particularly, when conventional power supply 2 comes into operation, if double power supply automatic transfer switch 3 does not receive the first signal, then illustrate that a certain phase line in conventional power supply 2 there occurs phase shortage, decompression or under-voltage, in order to the reliability of powering and security, load 6 circuit can be transformed into standby power supply 5 from the conventional power supply 2 broken down by double power supply automatic transfer switch 3 automatically; When standby power supply 5 comes into operation, if double power supply automatic transfer switch 3 does not receive secondary signal, then illustrate that a certain phase line in standby power supply 5 there occurs phase shortage, decompression or under-voltage, in order to the reliability of powering and security, load 6 circuit can be transformed into conventional power supply 2 from the standby power supply 5 broken down by double power supply automatic transfer switch 3 automatically.
Preferably, as shown in Figure 2, described first testing circuit 1 can comprise: the first detecting unit 11, whether the A phase voltage for detecting described conventional power supply 2 there is phase shortage, decompression or under-voltage, and it comprises the first rectification chip U1, the first divider resistance R13, the second divider resistance R19, the first power monitoring chip U7 and the first opto-coupler chip G1;
Described first rectification chip U1 two input ends couple with the live wire of the A phase of described conventional power supply 2 and zero line respectively, the live wire of the A phase of described conventional power supply 2 is become after direct current to export with the AC rectification between zero line, the forward voltage output terminal of described first rectification chip U1 and one end of described first divider resistance R13 couple, the other end of described first divider resistance R13 after described second divider resistance R19 with the ground terminal of described first power monitoring chip U7, common port after the first input end of described first power monitoring chip U7 is connected with the second input end and between described first divider resistance R13 and described second divider resistance R19 couples, the positive terminal of the illuminator in the output terminal of described first power monitoring chip U7 and described first opto-coupler chip G1 couples, the negative pole end ground connection of the illuminator in described first opto-coupler chip G1, the input termination high level of the light-receiving device in described first opto-coupler chip G1,
When the A phase voltage of described conventional power supply 2 do not occur phase shortage, decompression or under-voltage time, the forward voltage output terminal of described first rectification chip U1 exports high level, first input end and second input end of described first power monitoring chip U7 is transferred to after described first divider resistance R13 dividing potential drop, the output terminal of described first power monitoring chip U7 is made to export high level, now, illuminator conducting in described first opto-coupler chip G1 is luminous, makes the light-receiving device conducting in described first opto-coupler chip G1; Otherwise, the light-receiving device cut-off in described first opto-coupler chip G1.
Particularly, when conventional power supply 2 A phase voltage generation decompression or under-voltage time, the high level of the forward voltage output terminal output of the first rectification chip U1, first input end and second input end of the first power monitoring chip U7 is transferred to after the first divider resistance R13 dividing potential drop, now, because the A phase voltage generation decompression or under-voltage of conventional power supply 2, the first input end of the first power monitoring chip U7 and the voltage of the second input end are lower than the magnitude of voltage of the first power monitoring chip U7 nominal, make the output terminal meeting output low level of the first power monitoring chip U7, because the positive terminal of the illuminator in the output terminal of the first power monitoring chip U7 and the first opto-coupler chip G1 couples, cannot illuminator in conducting first opto-coupler chip G1 during output low level, and illuminator is not luminous, naturally the light-receiving device conducting in the first opto-coupler chip G1 cannot also be made, otherwise, under normal circumstances, the first input end of the first power monitoring chip U7 and the voltage of the second input end are higher than the magnitude of voltage of the first power monitoring chip U7 nominal, the output terminal of the first power monitoring chip U7 is made to export high level, now, the positive terminal of the illuminator in the first opto-coupler chip G1 is high level, and illuminator conducting is luminous, makes the light-receiving device in the first opto-coupler chip G1 also can light conducting.
When the A phase voltage generation phase shortage of conventional power supply 2, first rectification chip U1 Non voltage output, naturally can not to make in the first opto-coupler chip G1 illuminator conducting, and illuminator in the first opto-coupler chip G1 is not luminous yet, naturally also can not light-receiving device in conducting first opto-coupler chip G1.
Therefore, be in by the light-receiving device in the first opto-coupler chip G1 the state that conducting still ends, can know whether the A phase voltage of conventional power supply 2 there occurs phase shortage, decompression or under-voltage.
Preferably, as shown in Figure 2, described first testing circuit 1 can also comprise: the second detecting unit 12, whether the B phase voltage for detecting described conventional power supply 2 there is phase shortage, decompression or under-voltage, and it comprises the second rectification chip U2, the 3rd divider resistance R14, the 4th divider resistance R20, second source monitoring chip U8 and the second opto-coupler chip G2;
Described second rectification chip U2 two input ends couple with the live wire of the B phase of described conventional power supply 2 and zero line respectively, the live wire of the B phase of described conventional power supply 2 is become after direct current to export with the AC rectification between zero line, the forward voltage output terminal of described second rectification chip U2 and one end of described 3rd divider resistance R14 couple, the other end of described 3rd divider resistance R14 after described 4th divider resistance R20 with the ground terminal of described second source monitoring chip U8, common port after the first input end of described second source monitoring chip U8 is connected with the second input end and between described 3rd divider resistance R14 and described 4th divider resistance R20 couples, the positive terminal of the illuminator in the output terminal of described second source monitoring chip U8 and described second opto-coupler chip G2 couples, the negative pole end ground connection of the illuminator in described second opto-coupler chip G2, the output terminal of the light-receiving device in the input end of the light-receiving device in described second opto-coupler chip G2 and described first opto-coupler chip G1 couples,
When the A phase voltage of described conventional power supply 2 and B phase voltage all do not occur phase shortage, decompression or under-voltage time, the forward voltage output terminal of described second rectification chip U2 exports high level, first input end and second input end of described second source monitoring chip U8 is transferred to after described 3rd divider resistance R14 dividing potential drop, the output terminal of described second source monitoring chip U8 is made to export high level, now, illuminator conducting in described second opto-coupler chip G2 is luminous, makes the light-receiving device conducting in described second opto-coupler chip G2; Otherwise, the light-receiving device cut-off in described second opto-coupler chip G2.
Particularly, when phase shortage does not occur the A phase voltage of conventional power supply 2, decompression or under-voltage time, light-receiving device in first opto-coupler chip G1 is conducting, because the input termination high level of the light-receiving device in the first opto-coupler chip G1, during light-receiving device conducting in the first opto-coupler chip G1, the input end of the light-receiving device in the second opto-coupler chip G2 is also high level, if now there is not phase shortage in the B phase voltage of conventional power supply 2 yet, decompression or under-voltage, illuminator then in the second opto-coupler chip G2 is switched on luminous, and then the light-receiving device light conducting making in the second opto-coupler chip G2, otherwise, if the A phase voltage generation phase shortage of conventional power supply 2, decompression or under-voltage time, light-receiving device cut-off in first opto-coupler chip G1, the input end of the light-receiving device of second source monitoring chip U8 is made to obtain high level, light-receiving device cut-off in second opto-coupler chip G2, if the B phase voltage generation phase shortage of conventional power supply 2, decompression or under-voltage time, second source monitoring chip U8 output low level, the light-receiving device in second source monitoring chip U8 cannot conducting luminous, the light-receiving device in the second opto-coupler chip G2 also can end.Therefore, be in by the light-receiving device in the second opto-coupler chip G2 the state that conducting still ends, can know whether the A phase voltage of conventional power supply 2 or B phase voltage there occurs phase shortage, decompression or under-voltage.
Preferably, as shown in Figure 2, described first testing circuit 1 can also comprise: the 3rd detecting unit 13, whether the C phase voltage for detecting described conventional power supply 2 there is phase shortage, decompression or under-voltage, and it comprises the 3rd rectification chip U3, the 5th divider resistance R15, the 6th divider resistance R21, the 3rd power monitoring chip U9 and the 3rd opto-coupler chip G3;
Described 3rd rectification chip U3 two input ends couple with the live wire of the C phase of described conventional power supply 2 and zero line respectively, the live wire of the C phase of described conventional power supply 2 is become after direct current to export with the AC rectification between zero line, the forward voltage output terminal of described 3rd rectification chip U3 and one end of described 5th divider resistance R15 couple, the other end of described 5th divider resistance R15 after described 6th divider resistance R21 with the ground terminal of described 3rd power monitoring chip U9, common port after the first input end of described 3rd power monitoring chip U9 is connected with the second input end and between described 5th divider resistance R15 and described 6th divider resistance R21 couples, the positive terminal of the illuminator in the output terminal of described 3rd power monitoring chip U9 and described 3rd opto-coupler chip G3 couples, the negative pole end ground connection of the illuminator in described 3rd opto-coupler chip G3, the output terminal of the light-receiving device in the input end of the light-receiving device in described 3rd opto-coupler chip G3 and described second opto-coupler chip G2 couples,
When the A phase voltage of described conventional power supply 2, B phase voltage and C phase voltage all do not occur phase shortage, decompression or under-voltage time, the forward voltage output terminal of described 3rd rectification chip U3 exports high level, first input end and second input end of described 3rd power monitoring chip U9 is transferred to after described 5th divider resistance R15 dividing potential drop, the output terminal of described 3rd power monitoring chip U9 is made to export high level, now, illuminator conducting in described 3rd opto-coupler chip G3 is luminous, makes the light-receiving device conducting in described 3rd opto-coupler chip G3; Otherwise the light-receiving device cut-off in described 3rd opto-coupler chip G3, the output terminal of the light-receiving device in described 3rd opto-coupler chip G3 is the output terminal of described first testing circuit 1, for exporting described first signal to described double power supply automatic transfer switch 3.
Particularly, when the A phase voltage of conventional power supply 2, B phase voltage all do not occur phase shortage, decompression or under-voltage time, first opto-coupler chip G1 and the equal conducting of the second opto-coupler chip G2, now the input end of the 3rd opto-coupler chip G3 is also high level, when the C phase voltage of conventional power supply 2 do not occur yet phase shortage, decompression or under-voltage time, 3rd power monitoring chip U9 exports high level, and the illuminator conducting in the 3rd opto-coupler chip G3 is luminous, makes the light-receiving device light conducting in the 3rd opto-coupler chip G3, if otherwise the A phase voltage of conventional power supply 2, arbitrary phase line generation phase shortage in B phase voltage and C phase voltage, decompression or under-voltage time, light-receiving device cut-off in 3rd opto-coupler chip G3, because the output terminal of the light-receiving device in the 3rd opto-coupler chip G3 is the output terminal of the first testing circuit 1, for exporting described first signal to described double power supply automatic transfer switch 3, therefore the A phase voltage when conventional power supply 2 is only had, all there is not phase shortage in B phase voltage and C phase voltage, decompression or under-voltage time, light-receiving device in 3rd opto-coupler chip G3 just conducting can export the first signal to double power supply automatic transfer switch 3, when the A phase voltage of conventional power supply 2, arbitrary phase line generation phase shortage in B phase voltage and C phase voltage, decompression or under-voltage time, light-receiving device cut-off in 3rd opto-coupler chip G3, the first signal can not be exported to double power supply automatic transfer switch 3.Therefore be in by the light-receiving device in the 3rd opto-coupler chip G3 the state that conducting still ends, can know whether the A phase voltage of conventional power supply 2, B phase voltage and C phase voltage there occurs phase shortage, decompression or under-voltage.
Particularly, the first power monitoring chip U7 can select the power monitoring chip of the models such as 7044,7027, namely realizes above-mentioned functions by the internal hardware circuit structure in power monitoring chip.Complete the phase shortage to voltage, decompression or under-voltage detection.First opto-coupler chip G1 can select non-linear opto-coupler chip.
The principle of work of the second testing circuit 4 is close with the principle of work of the first testing circuit 1, preferably, as shown in Figure 3, described second testing circuit 4 can comprise: the 4th detecting unit 41, whether the A phase voltage for detecting described standby power supply 5 there is phase shortage, decompression or under-voltage, and it comprises the 4th rectification chip U4, the 7th divider resistance R16, the 8th divider resistance R22, the 4th power monitoring chip U10 and the 4th opto-coupler chip G4;
Described 4th rectification chip U4 two input ends couple with the live wire of the A phase of described standby power supply 5 and zero line respectively, the live wire of the A phase of described standby power supply 5 is become after direct current with the AC rectification between zero line and exports, the forward voltage output terminal of described 4th rectification chip U4 and one end of described 7th divider resistance R16 couple, the other end of described 7th divider resistance R16 after described 8th divider resistance R22 with the ground terminal of described 4th power monitoring chip U10, common port after the first input end of described 4th power monitoring chip U10 is connected with the second input end and between described 7th divider resistance R16 and described 8th divider resistance R22 couples, the positive terminal of the illuminator in the output terminal of described 4th power monitoring chip U10 and described 4th opto-coupler chip G4 couples, the negative pole end ground connection of the illuminator in described 4th opto-coupler chip G4, the input termination high level of the light-receiving device in described 4th opto-coupler chip G4,
When the A phase voltage of described standby power supply 5 do not occur phase shortage, decompression or under-voltage time, the forward voltage output terminal of described 4th rectification chip U4 exports high level, first input end and second input end of described 4th power monitoring chip U10 is transferred to after described 7th divider resistance R16 dividing potential drop, the output terminal of described 4th power monitoring chip U10 is made to export high level, now, illuminator conducting in described 4th opto-coupler chip G4 is luminous, makes the light-receiving device conducting in described 4th opto-coupler chip G4; Otherwise, the light-receiving device cut-off in described 4th opto-coupler chip G4.
Be in by the light-receiving device in the 4th opto-coupler chip G4 the state that conducting still ends, can know whether the A phase voltage of standby power supply 5 there occurs phase shortage, decompression or under-voltage.
Preferably, as shown in Figure 3, described second testing circuit 4 can also comprise: the 5th detecting unit 42, whether the B phase voltage for detecting described standby power supply 5 there is phase shortage, decompression or under-voltage, and it comprises the 5th rectification chip U5, the 9th divider resistance R17, the tenth point of piezoresistance R23, the 5th power monitoring chip U11 and the 5th opto-coupler chip G5;
Described 5th rectification chip U5 two input ends couple with the live wire of the B phase of described standby power supply 5 and zero line respectively, the live wire of the B phase of described standby power supply 5 is become after direct current with the AC rectification between zero line and exports, the forward voltage output terminal of described 5th rectification chip U5 and one end of described 9th divider resistance R17 couple, the other end of described 9th divider resistance R17 after the described ten point of piezoresistance R23 with the ground terminal of described 5th power monitoring chip U11, common port after the first input end of described 5th power monitoring chip U11 is connected with the second input end and between described 9th divider resistance R17 and the described ten point piezoresistance R23 couples, the positive terminal of the illuminator in the output terminal of described 5th power monitoring chip U11 and described 5th opto-coupler chip G5 couples, the negative pole end ground connection of the illuminator in described 5th opto-coupler chip G5, the output terminal of the light-receiving device in the input end of the light-receiving device in described 5th opto-coupler chip G5 and described 4th opto-coupler chip G4 couples,
When the A phase voltage of described standby power supply 5 and B phase voltage all do not occur phase shortage, decompression or under-voltage time, the forward voltage output terminal of described 5th rectification chip U5 exports high level, first input end and second input end of described 5th power monitoring chip U11 is transferred to after described 9th divider resistance R17 dividing potential drop, the output terminal of described 5th power monitoring chip U11 is made to export high level, now, illuminator conducting in described 5th opto-coupler chip G5 is luminous, makes the light-receiving device conducting in described 5th opto-coupler chip G5; Otherwise, the light-receiving device cut-off in described 5th opto-coupler chip G5.
Be in by the light-receiving device in the 5th opto-coupler chip G5 the state that conducting still ends, can know whether the A phase voltage of standby power supply 5 or B phase voltage there occurs phase shortage, decompression or under-voltage.
Preferably, as shown in Figure 3, described second testing circuit 4 can also comprise: the 6th detecting unit 43, whether the C phase voltage for detecting described standby power supply 5 there is phase shortage, decompression or under-voltage, and it comprises the 6th rectification chip U6, the 11 divider resistance R18, the 12 divider resistance R24, the 6th power monitoring chip U12 and the 6th opto-coupler chip G6;
Described 6th rectification chip U6 two input ends couple with the live wire of the C phase of described standby power supply 5 and zero line respectively, the live wire of the C phase of described standby power supply 5 is become after direct current with the AC rectification between zero line and exports, the forward voltage output terminal of described 6th rectification chip U6 and one end of described 11 divider resistance R18 couple, the other end of described 11 divider resistance R18 after described 12 divider resistance R24 with the ground terminal of described 6th power monitoring chip U12, common port after the first input end of described 6th power monitoring chip U12 is connected with the second input end and between described 11 divider resistance R18 and described 12 divider resistance R24 couples, the positive terminal of the illuminator in the output terminal of described 6th power monitoring chip U12 and described 6th opto-coupler chip G6 couples, the negative pole end ground connection of the illuminator in described 6th opto-coupler chip G6, the output terminal of the light-receiving device in the input end of the light-receiving device in described 6th opto-coupler chip G6 and described 5th opto-coupler chip G5 couples,
When the A phase voltage of described standby power supply 5, B phase voltage and C phase voltage all do not occur phase shortage, decompression or under-voltage time, the forward voltage output terminal of described 6th rectification chip U6 exports high level, first input end and second input end of described 6th power monitoring chip U12 is transferred to after described 11 divider resistance R18 dividing potential drop, the output terminal of described 6th power monitoring chip U12 is made to export high level, now, illuminator conducting in described 6th opto-coupler chip G6 is luminous, makes the light-receiving device conducting in described 6th opto-coupler chip G6; Otherwise the light-receiving device cut-off of described 6th opto-coupler chip G6, the output terminal of the light-receiving device in described 6th opto-coupler chip G6 is the output terminal of described second testing circuit 4, for exporting described secondary signal to described double power supply automatic transfer switch 3.
Only have when the A phase voltage of standby power supply 5, B phase voltage and C phase voltage all do not occur phase shortage, decompression or under-voltage time, light-receiving device in 6th opto-coupler chip G6 just conducting can export secondary signal to double power supply automatic transfer switch 3, when the arbitrary phase line generation phase shortage in the A phase voltage of standby power supply 5, B phase voltage and C phase voltage, decompression or under-voltage time, light-receiving device cut-off in 6th opto-coupler chip G6, can not export secondary signal to double power supply automatic transfer switch 3.Therefore be in by the light-receiving device in the 6th opto-coupler chip G6 the state that conducting still ends, can know whether the A phase voltage of standby power supply 5, B phase voltage and C phase voltage there occurs phase shortage, decompression or under-voltage.
Voltage detecting circuit described in the utility model, circuit is simple, control is accurate, antijamming capability is strong, the accurate state of conventional power supply or standby power supply can be exported, for the accurate control of double power supply automatic transfer switch 3 is had laid a good foundation to double power supply automatic transfer switch 3.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain that the utility model creates.
Claims (7)
1. a voltage detecting circuit, is characterized in that, comprising:
First testing circuit (1), whether the three-phase voltage for detecting conventional power supply (2) there is phase shortage, decompression or under-voltage, and the voltage of the arbitrary phase line of described conventional power supply (2) all do not occur phase shortage, decompression or under-voltage time conducting, the first signal is exported to double power supply automatic transfer switch (3), otherwise cut-off, does not export described first signal to described double power supply automatic transfer switch (3);
Second testing circuit (4), whether the three-phase voltage for detecting standby power supply (5) there is phase shortage, decompression or under-voltage, and the voltage of described standby power supply (5) arbitrary phase line all do not occur phase shortage, decompression or under-voltage time conducting, secondary signal is exported to described double power supply automatic transfer switch (3), otherwise cut-off, does not export described secondary signal to described double power supply automatic transfer switch (3).
2. voltage detecting circuit according to claim 1, it is characterized in that, described first testing circuit (1) comprising: the first detecting unit (11), whether the A phase voltage for detecting described conventional power supply (2) there is phase shortage, decompression or under-voltage, and it comprises the first rectification chip (U1), the first divider resistance (R13), the second divider resistance (R19), the first power monitoring chip (U7) and the first opto-coupler chip (G1);
Described first rectification chip (U1) two input ends couple with the live wire of the A phase of described conventional power supply (2) and zero line respectively, the live wire of the A phase of described conventional power supply (2) is become after direct current to export with the AC rectification between zero line, the forward voltage output terminal of described first rectification chip (U1) and one end of described first divider resistance (R13) couple, the other end of described first divider resistance (R13) after described second divider resistance (R19) with the ground terminal of described first power monitoring chip (U7), the common port that the first input end of described first power monitoring chip (U7) is connected with the second input end afterwards and between described first divider resistance (R13) and described second divider resistance (R19) couples, the positive terminal of the illuminator in the output terminal of described first power monitoring chip (U7) and described first opto-coupler chip (G1) couples, the negative pole end ground connection of the illuminator in described first opto-coupler chip (G1), the input termination high level of the light-receiving device in described first opto-coupler chip (G1),
When the A phase voltage of described conventional power supply (2) do not occur phase shortage, decompression or under-voltage time, the forward voltage output terminal of described first rectification chip (U1) exports high level, first input end and second input end of described first power monitoring chip (U7) is transferred to after described first divider resistance (R13) dividing potential drop, the output terminal of described first power monitoring chip (U7) is made to export high level, now, illuminator conducting in described first opto-coupler chip (G1) is luminous, makes the light-receiving device conducting in described first opto-coupler chip (G1); Otherwise, the light-receiving device cut-off in described first opto-coupler chip (G1).
3. voltage detecting circuit according to claim 2, it is characterized in that, described first testing circuit (1) also comprises: the second detecting unit (12), whether the B phase voltage for detecting described conventional power supply (2) there is phase shortage, decompression or under-voltage, and it comprises the second rectification chip (U2), the 3rd divider resistance (R14), the 4th divider resistance (R20), second source monitoring chip (U8) and the second opto-coupler chip (G2);
Described second rectification chip (U2) two input ends couple with the live wire of the B phase of described conventional power supply (2) and zero line respectively, the live wire of the B phase of described conventional power supply (2) is become after direct current to export with the AC rectification between zero line, the forward voltage output terminal of described second rectification chip (U2) and one end of described 3rd divider resistance (R14) couple, the other end of described 3rd divider resistance (R14) after described 4th divider resistance (R20) with the ground terminal of described second source monitoring chip (U8), the common port that the first input end of described second source monitoring chip (U8) is connected with the second input end afterwards and between described 3rd divider resistance (R14) and described 4th divider resistance (R20) couples, the positive terminal of the illuminator in the output terminal of described second source monitoring chip (U8) and described second opto-coupler chip (G2) couples, the negative pole end ground connection of the illuminator in described second opto-coupler chip (G2), the output terminal of the light-receiving device in the input end of the light-receiving device in described second opto-coupler chip (G2) and described first opto-coupler chip (G1) couples,
When the A phase voltage of described conventional power supply (2) and B phase voltage all phase shortage do not occur, decompression or under-voltage time, the forward voltage output terminal of described second rectification chip (U2) exports high level, first input end and second input end of described second source monitoring chip (U8) is transferred to after described 3rd divider resistance (R14) dividing potential drop, the output terminal of described second source monitoring chip (U8) is made to export high level, now, illuminator conducting in described second opto-coupler chip (G2) is luminous, make the light-receiving device conducting in described second opto-coupler chip (G2), otherwise, the light-receiving device cut-off in described second opto-coupler chip (G2).
4. voltage detecting circuit according to claim 3, it is characterized in that, described first testing circuit (1) also comprises: the 3rd detecting unit (13), whether the C phase voltage for detecting described conventional power supply (2) there is phase shortage, decompression or under-voltage, and it comprises the 3rd rectification chip (U3), the 5th divider resistance (R15), the 6th divider resistance (R21), the 3rd power monitoring chip (U9) and the 3rd opto-coupler chip (G3);
Described 3rd rectification chip (U3) two input ends couple with the live wire of the C phase of described conventional power supply (2) and zero line respectively, the live wire of the C phase of described conventional power supply (2) is become after direct current to export with the AC rectification between zero line, the forward voltage output terminal of described 3rd rectification chip (U3) and one end of described 5th divider resistance (R15) couple, the other end of described 5th divider resistance (R15) after described 6th divider resistance (R21) with the ground terminal of described 3rd power monitoring chip (U9), the common port that the first input end of described 3rd power monitoring chip (U9) is connected with the second input end afterwards and between described 5th divider resistance (R15) and described 6th divider resistance (R21) couples, the positive terminal of the illuminator in the output terminal of described 3rd power monitoring chip (U9) and described 3rd opto-coupler chip (G3) couples, the negative pole end ground connection of the illuminator in described 3rd opto-coupler chip (G3), the output terminal of the light-receiving device in the input end of the light-receiving device in described 3rd opto-coupler chip (G3) and described second opto-coupler chip (G2) couples,
When the A phase voltage of described conventional power supply (2), all there is not phase shortage in B phase voltage and C phase voltage, decompression or under-voltage time, the forward voltage output terminal of described 3rd rectification chip (U3) exports high level, first input end and second input end of described 3rd power monitoring chip (U9) is transferred to after described 5th divider resistance (R15) dividing potential drop, the output terminal of described 3rd power monitoring chip (U9) is made to export high level, now, illuminator conducting in described 3rd opto-coupler chip (G3) is luminous, make the light-receiving device conducting in described 3rd opto-coupler chip (G3), otherwise, light-receiving device cut-off in described 3rd opto-coupler chip (G3), the output terminal of the light-receiving device in described 3rd opto-coupler chip (G3) is the output terminal of described first testing circuit (1), for exporting described first signal to described double power supply automatic transfer switch (3).
5. voltage detecting circuit according to claim 1, it is characterized in that, described second testing circuit (4) comprising: the 4th detecting unit (41), whether the A phase voltage for detecting described standby power supply (5) there is phase shortage, decompression or under-voltage, and it comprises the 4th rectification chip (U4), the 7th divider resistance (R16), the 8th divider resistance (R22), the 4th power monitoring chip (U10) and the 4th opto-coupler chip (G4);
Described 4th rectification chip (U4) two input ends couple with the live wire of the A phase of described standby power supply (5) and zero line respectively, the live wire of the A phase of described standby power supply (5) is become after direct current with the AC rectification between zero line and exports, the forward voltage output terminal of described 4th rectification chip (U4) and one end of described 7th divider resistance (R16) couple, the other end of described 7th divider resistance (R16) after described 8th divider resistance (R22) with the ground terminal of described 4th power monitoring chip (U10), the common port that the first input end of described 4th power monitoring chip (U10) is connected with the second input end afterwards and between described 7th divider resistance (R16) and described 8th divider resistance (R22) couples, the positive terminal of the illuminator in the output terminal of described 4th power monitoring chip (U10) and described 4th opto-coupler chip (G4) couples, the negative pole end ground connection of the illuminator in described 4th opto-coupler chip (G4), the input termination high level of the light-receiving device in described 4th opto-coupler chip (G4),
When the A phase voltage of described standby power supply (5) do not occur phase shortage, decompression or under-voltage time, the forward voltage output terminal of described 4th rectification chip (U4) exports high level, first input end and second input end of described 4th power monitoring chip (U10) is transferred to after described 7th divider resistance (R16) dividing potential drop, the output terminal of described 4th power monitoring chip (U10) is made to export high level, now, illuminator conducting in described 4th opto-coupler chip (G4) is luminous, makes the light-receiving device conducting in described 4th opto-coupler chip (G4); Otherwise, the light-receiving device cut-off in described 4th opto-coupler chip (G4).
6. voltage detecting circuit according to claim 5, it is characterized in that, described second testing circuit (4) also comprises: the 5th detecting unit (42), whether the B phase voltage for detecting described standby power supply (5) there is phase shortage, decompression or under-voltage, and it comprises the 5th rectification chip (U5), the 9th divider resistance (R17), the tenth point of piezoresistance (R23), the 5th power monitoring chip (U11) and the 5th opto-coupler chip (G5);
Described 5th rectification chip (U5) two input ends couple with the live wire of the B phase of described standby power supply (5) and zero line respectively, the live wire of the B phase of described standby power supply (5) is become after direct current with the AC rectification between zero line and exports, the forward voltage output terminal of described 5th rectification chip (U5) and one end of described 9th divider resistance (R17) couple, the other end of described 9th divider resistance (R17) after the described ten point of piezoresistance (R23) with the ground terminal of described 5th power monitoring chip (U11), the common port that the first input end of described 5th power monitoring chip (U11) is connected with the second input end afterwards and between described 9th divider resistance (R17) and the described ten point of piezoresistance (R23) couples, the positive terminal of the illuminator in the output terminal of described 5th power monitoring chip (U11) and described 5th opto-coupler chip (G5) couples, the negative pole end ground connection of the illuminator in described 5th opto-coupler chip (G5), the output terminal of the light-receiving device in the input end of the light-receiving device in described 5th opto-coupler chip (G5) and described 4th opto-coupler chip (G4) couples,
When the A phase voltage of described standby power supply (5) and B phase voltage all phase shortage do not occur, decompression or under-voltage time, the forward voltage output terminal of described 5th rectification chip (U5) exports high level, first input end and second input end of described 5th power monitoring chip (U11) is transferred to after described 9th divider resistance (R17) dividing potential drop, the output terminal of described 5th power monitoring chip (U11) is made to export high level, now, illuminator conducting in described 5th opto-coupler chip (G5) is luminous, make the light-receiving device conducting in described 5th opto-coupler chip (G5), otherwise, the light-receiving device cut-off in described 5th opto-coupler chip (G5).
7. voltage detecting circuit according to claim 6, it is characterized in that, described second testing circuit (4) also comprises: the 6th detecting unit (43), whether the C phase voltage for detecting described standby power supply (5) there is phase shortage, decompression or under-voltage, and it comprises the 6th rectification chip (U6), the 11 divider resistance (R18), the 12 divider resistance (R24), the 6th power monitoring chip (U12) and the 6th opto-coupler chip (G6);
Described 6th rectification chip (U6) two input ends couple with the live wire of the C phase of described standby power supply (5) and zero line respectively, the live wire of the C phase of described standby power supply (5) is become after direct current with the AC rectification between zero line and exports, the forward voltage output terminal of described 6th rectification chip (U6) and one end of described 11 divider resistance (R18) couple, the other end of described 11 divider resistance (R18) after described 12 divider resistance (R24) with the ground terminal of described 6th power monitoring chip (U12), the common port that the first input end of described 6th power monitoring chip (U12) is connected with the second input end afterwards and between described 11 divider resistance (R18) and described 12 divider resistance (R24) couples, the positive terminal of the illuminator in the output terminal of described 6th power monitoring chip (U12) and described 6th opto-coupler chip (G6) couples, the negative pole end ground connection of the illuminator in described 6th opto-coupler chip (G6), the output terminal of the light-receiving device in the input end of the light-receiving device in described 6th opto-coupler chip (G6) and described 5th opto-coupler chip (G5) couples,
When the A phase voltage of described standby power supply (5), all there is not phase shortage in B phase voltage and C phase voltage, decompression or under-voltage time, the forward voltage output terminal of described 6th rectification chip (U6) exports high level, first input end and second input end of described 6th power monitoring chip (U12) is transferred to after described 11 divider resistance (R18) dividing potential drop, the output terminal of described 6th power monitoring chip (U12) is made to export high level, now, illuminator conducting in described 6th opto-coupler chip (G6) is luminous, make the light-receiving device conducting in described 6th opto-coupler chip (G6), otherwise, the light-receiving device cut-off of described 6th opto-coupler chip (G6), the output terminal of the light-receiving device in described 6th opto-coupler chip (G6) is the output terminal of described second testing circuit (4), for exporting described secondary signal to described double power supply automatic transfer switch (3).
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| CN110161325A (en) * | 2018-02-14 | 2019-08-23 | 台达电子工业股份有限公司 | Voltage detecting circuit |
| CN110161325B (en) * | 2018-02-14 | 2022-04-19 | 台达电子工业股份有限公司 | Voltage detection circuit |
| CN108427022A (en) * | 2018-04-20 | 2018-08-21 | 苏州科技大学 | The detuning protective device of high-pressure series Resonance Voltage Withstand Test |
| CN110554260A (en) * | 2019-08-13 | 2019-12-10 | 威胜信息技术股份有限公司 | double-circuit voltage switching line loss measuring system and control method and device |
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