CN204925363U - Detection circuitry of three -phase uninterrupted power source input zero line disappearance - Google Patents
Detection circuitry of three -phase uninterrupted power source input zero line disappearance Download PDFInfo
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- CN204925363U CN204925363U CN201520749391.7U CN201520749391U CN204925363U CN 204925363 U CN204925363 U CN 204925363U CN 201520749391 U CN201520749391 U CN 201520749391U CN 204925363 U CN204925363 U CN 204925363U
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- zero line
- operational amplifier
- power supply
- fault
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Abstract
The utility model relates to a detection circuitry of three -phase uninterrupted power source input zero line disappearance, including 10 ground voltage sampling circuit and rather than a fault -signal isolated transmission circuit that links to each other, zero ground voltage sampling circuit includes a first resistance R1, a second resistance R2, a third resistance R3, a fourth resistance R4 and an operational amplifier, the fault -signal isolated transmission circuit includes 1 the 5th resistance R5, 1 the 1st optoelectronic coupler, 1 the 6th resistance R6 and 1 the 2nd optoelectronic coupler. The utility model discloses can solve and with high costsly when adopting current transformer to detect the zero line disappearance not enough or need consume the not enough of the inside resource of more CPU when utilizing the software algorithm.
Description
Technical field
The utility model relates to field of power electronics, particularly a kind of testing circuit of three-phase uninterrupted power supply input zero line disappearance.
Background technology
The input of three-phase UPS is generally three-phase five-wire mode, the i.e. U phase line of AC network, V phase line, W phase line, zero line and ground wire, as shown in Figure 1, input zero line and the electrical network zero line of UPS link together, and the input ground wire of UPS and UPS casing and electrical network ground wire link together.Electrical network ground wire is 0 absolute potential reference point.Ideally, the zero line of UPS and ground wire are iso-electric, and part-loading goods Un is 0, but because there is the situations such as zero line cable resistance, impedance ground, the unbalance load of UPS band, in fact the part-loading goods of UPS is not 0, but a little value.When UPS input zero line disappearance time, UPS part-loading goods will become a larger difference, this value may be on the occasion of also may be negative value.When zero line lacks, need detect in time, to ensure that UPS can normally work.
The detection method that current three-phase UPS inputs zero line disappearance is generally detect neutral line current size to judge by installing a current transformer on the zero line cable of three-phase UPS inside additional, but the method is because needing an extra current transformer, and cost is high.In addition, also have the magnitude of voltage by the method detection input three-phase mains of software and judged by some software algorithms, but the method needs more complicated software algorithm and consumes more CPU internal resource, inapplicable when cpu resource anxiety.
Summary of the invention
In view of this, the purpose of this utility model is to provide the testing circuit of a kind of three-phase uninterrupted power supply input zero line disappearance, the deficiency that when adopting current transformer to detect zero line disappearance in order to solve, cost is high or need when utilizing software algorithm to consume the deficiency compared with multi-CPU internal resource.
The utility model adopts following scheme to realize: a kind of testing circuit of three-phase uninterrupted power supply input zero line disappearance, comprises a part-loading goods sample circuit and a coupled fault-signal isolation and transmission circuit; Described part-loading goods sample circuit comprises one first resistance R1, one second resistance R2, one the 3rd resistance R3, one the 4th resistance R4 and an operational amplifier; Described fault-signal isolation and transmission circuit comprises one the 5th resistance R5, one first photoelectrical coupler, one the 6th resistance R6 and one second photoelectrical coupler.
Further, the inverting input of operational amplifier described in described part-loading goods sample circuit connects the earth sampling spot through described first resistance R1, and the in-phase input end of described operational amplifier is connected to a UPS through described second resistance R2 and inputs zero line sampling spot; The inverting input of described operational amplifier also connects one end of described 3rd resistance R3, and the other end of described 3rd resistance R3 is connected to the output terminal of described operational amplifier; The in-phase input end of described operational amplifier also connects one end of described 4th resistance R4, and another termination operational amplifier power supply of described 4th resistance R4 is with reference to ground.
Further, the former limit of the first photoelectrical coupler described in described fault-signal isolation and transmission circuit is one first light emitting diode, and the former limit of described second photoelectrical coupler is one second light emitting diode; One end of described 5th resistance R5 is connected with the output terminal of described operational amplifier, and the other end of described 5th resistance R5 is connected with the positive pole of the negative pole of described first light emitting diode and described second light emitting diode; The positive pole of described first light emitting diode and the negative pole of described second light emitting diode all connect operational amplifier power supply with reference to ground.
Further, the secondary of the first photoelectrical coupler described in described fault-signal isolation and transmission circuit is one first phototriode, and the secondary of described second photoelectrical coupler is one second phototriode; The collector of described first phototriode and the collector of described second phototriode are all connected to one end of described 6th resistance R6, and the other end of described 6th resistance R6 is connected to an insulating power supply; The emitter of described first phototriode and the emitter of described second phototriode all connect insulating power supply with reference to ground; One end of described 6th resistance R6 can be used as the output terminal of described zero line miss fault signal-isolated transmission circuit, in order to export a fault-signal.
Preferably, described first resistance R1 is identical with the resistance of described second resistance R2; Described 3rd resistance R3 is identical with the resistance of described 4th resistance R4.
Compared with prior art, the utility model, when three-phase UPS zero line lacks, can detect fault and take corresponding measure with the serious consequence preventing UPS from cannot normally work, and compared with prior art to have following beneficial effect in time:
1, the deficiency that when adopting current transformer detection zero line disappearance, device cost is high is overcome;
2, overcome software algorithm complexity when adopting software algorithm and need to consume the deficiency compared with multi-CPU internal resource.
Accompanying drawing explanation
Fig. 1 is that in prior art, three-phase UPS inputs schematic diagram.
Fig. 2 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
The present embodiment provides a kind of testing circuit of three-phase uninterrupted power supply input zero line disappearance, as shown in Figure 1, comprises a part-loading goods sample circuit and a coupled fault-signal isolation and transmission circuit; Described part-loading goods sample circuit comprises one first resistance R1, one second resistance R2, one the 3rd resistance R3, one a 4th resistance R4 and operational amplifier IC1; Described fault-signal isolation and transmission circuit comprises one the 5th resistance R5, one first photoelectrical coupler IC2, one the 6th resistance R6 and one second photoelectrical coupler IC3.
In the present embodiment, the inverting input of operational amplifier described in described part-loading goods sample circuit connects the earth sampling spot through described first resistance R1, and the in-phase input end of described operational amplifier IC1 is connected to a UPS through described second resistance R2 and inputs zero line sampling spot; The inverting input of described operational amplifier IC1 also connects one end of described 3rd resistance R3, and the other end of described 3rd resistance R3 is connected to the output terminal of described operational amplifier IC1; The in-phase input end of described operational amplifier IC1 also connects one end of described 4th resistance R4, and another termination operational amplifier power supply of described 4th resistance R4 is with reference to ground.
In the present embodiment, the former limit of the first photoelectrical coupler IC2 described in described fault-signal isolation and transmission circuit is one first light emitting diode, and the former limit of described second photoelectrical coupler IC3 is one second light emitting diode; One end of described 5th resistance R5 is connected with the output terminal of described operational amplifier IC1, and the other end of described 5th resistance R5 is connected with the positive pole of the negative pole of described first light emitting diode and described second light emitting diode; The positive pole of described first light emitting diode and the negative pole of described second light emitting diode all connect operational amplifier power supply with reference to ground.
In the present embodiment, the secondary of the first photoelectrical coupler IC2 described in described fault-signal isolation and transmission circuit is one first phototriode, and the secondary of described second photoelectrical coupler IC3 is one second phototriode; The collector of described first phototriode and the collector of described second phototriode are all connected to one end of described 6th resistance R6, and the other end of described 6th resistance R6 is connected to an insulating power supply; The emitter of described first phototriode and the emitter of described second phototriode all connect insulating power supply with reference to ground; One end of described 6th resistance R6 can be used as the output terminal of described zero line miss fault signal-isolated transmission circuit, in order to export a fault-signal Fault.
In the present embodiment, preferably, described first resistance R1 is identical with the resistance of described second resistance R2; Described 3rd resistance R3 is identical with the resistance of described 4th resistance R4.
In the present embodiment, the principle of work of described circuit is as follows: one end of described operational amplifier IC1 is connected to UPS by the second resistance R2 and inputs zero line sampling spot, the other end of operational amplifier IC1 is connected to the earth sampling spot by the first resistance R1, and the 3rd resistance R3 and the 4th resistance R4 can arrange the attenuation coefficient of part-loading goods.As resistance R1=R2, during R3=R4, the output voltage Vout=(Un-UGND of operational amplifier IC1) × R3/R1.The former limit of the 5th resistance R5 and photoelectrical coupler IC2, IC3 forms threshold voltage detection circuit, and wherein the 5th resistance R5 is for arranging the On current of photoelectrical coupler.Photoelectrical coupler IC2, IC3 secondary and the 6th resistance R6 form fault-signal isolation and transmission circuit, and the 6th resistance R6 plays the effect of level pull-up.Getting part-loading goods threshold value is | K|.As Un>|K| or Un<-|K|, the primary current I=(Vout-Vop of photoelectrical coupler IC3 or photoelectrical coupler IC2)/R5, Vop is the conduction voltage drop of the former limit light emitting diode of photoelectrical coupler, the value of the 5th resistance R5 is set, make primary current be enough to photoelectrical coupler IC3 or the effective conducting of photoelectrical coupler IC2, fault-signal Fault becomes low level.When part-loading goods is in normal range, namely-| during K|<Un<|K|, make the resistance of the 5th resistance R5 be not enough to photoelectrical coupler IC2 or the effective conducting of photoelectrical coupler IC3, now fault-signal Fault is high level.By detecting Fault signal, UPS judges whether input zero line lacks, and to make corresponding measure, prevents UPS emergency protection.
Above content is only preferred embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
Claims (5)
1. a testing circuit for three-phase uninterrupted power supply input zero line disappearance, is characterized in that: comprise a part-loading goods sample circuit and a coupled fault-signal isolation and transmission circuit; Described part-loading goods sample circuit comprises one first resistance R1, one second resistance R2, one the 3rd resistance R3, one the 4th resistance R4 and an operational amplifier; Described fault-signal isolation and transmission circuit comprises one the 5th resistance R5, one first photoelectrical coupler, one the 6th resistance R6 and one second photoelectrical coupler.
2. the testing circuit of a kind of three-phase uninterrupted power supply input zero line disappearance according to claim 1, it is characterized in that: the inverting input of operational amplifier described in described part-loading goods sample circuit connects the earth sampling spot through described first resistance R1, the in-phase input end of described operational amplifier is connected to a UPS through described second resistance R2 and inputs zero line sampling spot; The inverting input of described operational amplifier also connects one end of described 3rd resistance R3, and the other end of described 3rd resistance R3 is connected to the output terminal of described operational amplifier; The in-phase input end of described operational amplifier also connects one end of described 4th resistance R4, and another termination operational amplifier power supply of described 4th resistance R4 is with reference to ground.
3. the testing circuit of a kind of three-phase uninterrupted power supply input zero line disappearance according to claim 1, it is characterized in that: the former limit of the first photoelectrical coupler described in described fault-signal isolation and transmission circuit is one first light emitting diode, the former limit of described second photoelectrical coupler is one second light emitting diode; One end of described 5th resistance R5 is connected with the output terminal of described operational amplifier, and the other end of described 5th resistance R5 is connected with the positive pole of the negative pole of described first light emitting diode and described second light emitting diode; The positive pole of described first light emitting diode and the negative pole of described second light emitting diode all connect operational amplifier power supply with reference to ground.
4. the testing circuit of a kind of three-phase uninterrupted power supply input zero line disappearance according to claim 1, it is characterized in that: the secondary of the first photoelectrical coupler described in described fault-signal isolation and transmission circuit is one first phototriode, the secondary of described second photoelectrical coupler is one second phototriode; The collector of described first phototriode and the collector of described second phototriode are all connected to one end of described 6th resistance R6, and the other end of described 6th resistance R6 is connected to an insulating power supply; The emitter of described first phototriode and the emitter of described second phototriode all connect insulating power supply with reference to ground; One end of described 6th resistance R6 can be used as the output terminal of described zero line miss fault signal-isolated transmission circuit, in order to export a fault-signal.
5. the testing circuit of a kind of three-phase uninterrupted power supply input zero line disappearance according to claim 2, is characterized in that: described first resistance R1 is identical with the resistance of described second resistance R2; Described 3rd resistance R3 is identical with the resistance of described 4th resistance R4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520749391.7U CN204925363U (en) | 2015-09-25 | 2015-09-25 | Detection circuitry of three -phase uninterrupted power source input zero line disappearance |
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| CN201520749391.7U CN204925363U (en) | 2015-09-25 | 2015-09-25 | Detection circuitry of three -phase uninterrupted power source input zero line disappearance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109298354A (en) * | 2018-11-14 | 2019-02-01 | 厦门科华恒盛股份有限公司 | The detection method and device of system zero-line failure are fallen in a kind of input of uninterruptible power supply |
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2015
- 2015-09-25 CN CN201520749391.7U patent/CN204925363U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109298354A (en) * | 2018-11-14 | 2019-02-01 | 厦门科华恒盛股份有限公司 | The detection method and device of system zero-line failure are fallen in a kind of input of uninterruptible power supply |
| WO2020098399A1 (en) * | 2018-11-14 | 2020-05-22 | 科华恒盛股份有限公司 | Method and apparatus for detecting input neutral line disconnection fault of uninterruptible power supply |
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