CN202678932U

CN202678932U - Three-phase solid-state relay with missing phase-preventing function

Info

Publication number: CN202678932U
Application number: CN2012203754187U
Authority: CN
Inventors: 不公告发明人
Original assignee: HANGZHOU LONGKE ELECTRONICS CO Ltd
Current assignee: HANGZHOU LONGKE ELECTRONICS CO Ltd
Priority date: 2012-07-30
Filing date: 2012-07-30
Publication date: 2013-01-16
Anticipated expiration: 2022-07-30

Abstract

The utility model provides a three-phase solid-state relay with a missing phase-preventing function. The three-phase solid-state relay with the missing phase-preventing function comprises a connecting terminal, a data-processing ECU (Electronic Control Unit) circuit, a photoelectric isolating Opt circuit, a missing phase-detecting circuit, a thyristor SCR (Silicon Controlled Rectifier) and a protective element which are mutually connected, wherein the connecting terminal is used for receiving an external sensor signal and transmitting an original signal to a data-processing device; after the processed signal is isolated by the photoelectric isolating circuit, the trigger signal triggers the thyristor to switch on for work; and in the whole process, the missing phase-detecting circuit monitors whether power input has a missing phase phenomenon. When the missing phase phenomenon happens, an STA (Static Timing Analysis) end outputs direct current to supply working power to the alarm device; a control voltage is directly input into a CONT (control) end, so that the three-phase solid-state relay with the missing phase-preventing function can be used on an occasion where missing phase detection is not required; and the three-phase solid-state relay with the missing phase-preventing function is simple and stable in circuit and has wide application and popularization potentials.

Description

The open-phase protection three-phase solid relay

Affiliated technical field

The utility model relates to a kind of relay, especially can be in three-phase input any one automatically protection and the three-phase solid relay of reporting to the police when mutually open-phase fault occuring.

Background technology

At present, owing in the abominable occasion of some operating mode, because three-phase power supply system breaks down, cause threephase load in work power supply in service arbitrary mutually unexpected phase shortage to be arranged, cause threephase load to work, in the situation of frequent occurrence phase shortage even can be with the threephase load permanent damage.The generation of traditional reply phase shortage phenomenon, easy mode are to use fuse, but that its shortcoming is reaction speed is slow, Reliability of Microprocessor is poor, are inapplicable for the load appliance of precision; Or the special-purpose open phase protector of use, its shortcoming is that acquisition cost is expensive, and wiring is loaded down with trivial details, and equipment volume is larger etc., is unfavorable for the production application of each medium-sized and small enterprises.Solid-state relay is as contactless, no-spark, noiseless, and without electromagnetic interference, switching speed is fast, and the novel electron switch that antijamming capability is strong is of wide application.But because the in the past restriction of technical conditions is difficult to accomplish default-phase protection function is combined with solid-state relay.Someone once realized default-phase protection function with the mode that three luminous neon bulbs link to each other with dropping resistor, although can realize this function, it is owing to complex manufacturing, and manufacturing cost is higher, and the product defects rate is higher, is difficult to extensive popularization.

Summary of the invention

Can not realize detecting open-phase fault and start the automatically deficiency of protection in order to overcome existing solid-state relay; the utility model provides a kind of open-phase protection three-phase solid relay; this three-phase solid relay can not only detect three phase mains and open-phase fault whether occur; can also timely and effectively the load supplying loop be disconnected; guaranteed the safeguard protection to power consumption equipment, and the power supply of warning device is provided.

The technical scheme that its technical problem that solves the utility model adopts is: by binding post 4 pin and 2 pin access 12-24VDC signal, signal is after data processing unit ECU chip is processed, if phase shortage alarm signal PHFL is low level, then data processing unit ECU enters the photoelectricity isolated location with triggering signal TRIG with the form of high level.The central role of photoelectric isolating circuit is in the situation of electricity isolation, transmit signal take light as medium, can isolate the input and output circuit, thereby can effectively suppress system noise, eliminate the interference of grounded circuit, have that response speed is very fast, the life-span is long, the little benefit such as shock-resistant of volume, thyristor triggering signal TRIG is sent to the forceful electric power loop from weak electrical loop undistortedly.Synchronous working when three road thyristors are subject to triggering signal TRIG is connected three-phase major loop forceful electric power R, S, T.Work under the protection of deadlocked dose of epoxy resin in whole work loop, so that circuit safety, stable is not disturbed by external factor.

The beneficial effects of the utility model are, can be in the situations of three phase supply power phase shortage, and disconnecting consumers power supply timely and effectively, the output DC source is for warning device work simultaneously, and the circuit simple and stable can significantly be enhanced productivity.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is the intact phase time circuit waveform of three-phase figure.

Fig. 3 is embodiment of the present utility model system pie graph

1. test contact among the figure, 2. insulation crust, 3. spring, 4. concentric resistance, 5. current-limiting resistance, 6. shunt resistance, 7. identification electrode, 8. neon tube, 9. spring, 10. bonnet, 11. hand touched electrode, 12. dielectric isolation layers, 13. springs.

Embodiment

By binding post 4 pin and 2 pin access 12-24VDC signal, signal is after data processing unit ECU chip is processed, if phase shortage alarm signal PHFL is low level, then data processing unit ECU enters the photoelectricity isolated location with triggering signal TRIG with the form of high level.The central role of photoelectric isolating circuit is in the situation of electricity isolation, transmit signal take light as medium, can isolate the input and output circuit, thereby can effectively suppress system noise, eliminate the interference of grounded circuit, have that response speed is very fast, the life-span is long, the little benefit such as shock-resistant of volume, thyristor triggering signal TRIG is sent to the forceful electric power loop from weak electrical loop undistortedly.Synchronous working when three road thyristors are subject to triggering signal TRIG is connected three-phase major loop forceful electric power R, S, T.

When three-phase input voltage was normal, its three-phase was inputted phase voltage waveform as shown in Figure 2, in interval T1, and U _A＞U _C＞U _B, the A phase voltage is maximum, and the B phase voltage is minimum, therefore, the optocoupler D in Fig. 1 ₁With diode VD ₅Conducting, at this moment, control signal U _CBe low level, when the time from T ₁Enter T ₂When interval, U _A＞U _B＞U _C, the A phase voltage is maximum, and the C phase voltage is minimum, therefore, the optocoupler D in Fig. 1 ₁With diode VD ₄Conducting, U _CBe low level, so analogize, at interval T ₃, T ₄, T ₅, T ₆The time, U _CBe low level.So, in a power cycle, U _CBe low level, that is to say, when three-phase input voltage is normal (not phase shortage), U _CBe low level, be low level thereby make phase shortage alarm signal PHFL always, and the expression input is normal.

When the three-phase input voltage phase shortage, owing to lack the C phase time, line voltage only has U _ABOne phase is worked as U _ABWhen near zero-crossing point, optocoupler D ₁Not conducting, all the other two also not conductings of optocoupler, at this moment, control signal U _CBeing high level, is high level thereby make phase shortage alarm signal PHFL, and the expression input phase failure send data processing unit ECU to process.

Claims

1. an open-phase protection three-phase solid relay under epoxy encapsulation, is interconnected by binding post, data processing equipment ECU, photoelectricity isolation Opt circuit, lack detection circuit, thyristor SCR and protection component RC; It is characterized in that: binding post receives the external sense signal, primary signal is sent to data processes the ECU unit, and the signal after processing is processed triggers thyristor SCR conducting work by triggering signal TRIG after the isolation of photoelectricity isolation Opt circuit; In whole process, there is the input of lack detection circuit monitoring power supply the phase shortage phenomenon whether to occur.

2. open-phase protection three-phase solid relay according to claim 1; it is characterized in that: the 4th pin by the four-core binding post is anodal; input 12-24V direct current signal; with signal input data processing circuit ECU chip; under the lack detection circuit effect, judge whether further to provide thyristor SCR triggering signal TRIG simultaneously.

3. open-phase protection three-phase solid relay according to claim 1 is characterized in that: by the signal after the data processing unit ECU processing, through photoelectric coupling Opt circuit, with three road thyristor SCR major loop triggering and conducting in the three-phase circuit.

4. open-phase protection three-phase solid relay according to claim 1; it is characterized in that: after the phase shortage situation occurs; lack detection circuit feeds back to the PHFL high level rapidly data and processes the ECU unit, cuts off immediately the thyristor triggering signal TRIG in the photoelectric coupling Opt loop simultaneously.

5. open-phase protection three-phase solid relay according to claim 1 is characterized in that: can not occur under the work condition environment of power phase shortage, will control voltage and directly input the CONT end, then also can make easily common 3 phase AC solid relay and use.

6. open-phase protection three-phase solid relay according to claim 1 is characterized in that: the PHFL high level signal that lack detection circuit produces, behind the ECU unit, by triode and voltage-stabiliser tube with the STA end of DC signal output to the four-core binding post; STA holds d. c. indicator light, buzzer, the relay of external operating voltage 3-24Vdc, or is connected with other automatic control equipment, makes alarm.