CN204031113U - A kind of electronic type voltage relay - Google Patents
A kind of electronic type voltage relay Download PDFInfo
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- CN204031113U CN204031113U CN201420460538.6U CN201420460538U CN204031113U CN 204031113 U CN204031113 U CN 204031113U CN 201420460538 U CN201420460538 U CN 201420460538U CN 204031113 U CN204031113 U CN 204031113U
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Abstract
The utility model discloses a kind of electronic type voltage relay, comprise voltage detecting circuit and bidirectional switch circuit, photoelectric coupled device is connected with between voltage detecting circuit and bidirectional switch circuit, the input of voltage detecting circuit is as the input of electronic type voltage relay, the output of voltage detecting circuit is connected with the optical transmitting set of photoelectric coupled device, the input of bidirectional switch circuit connects the optical receiver of photoelectric coupled device, and the output of bidirectional switch circuit is as the output of electronic type voltage relay.Compare traditional electromagnetic potential relay and there is the shortcoming that the life-span is short, cost is low, electronic type voltage relay of the present utility model relies on electronic device can realize the controlling functions of relay completely, long service life and price is lower, can be widely used in the middle of various electrical equipment.
Description
Technical field
The utility model relates to a kind of electronic type voltage relay, particularly a kind of electronic type voltage relay for electric motor starting.
Background technology
Electromagnetic potential relay is the normal electric motor starting relay adopted in household electrical appliance, is made up of coil, iron core, movable iron, movable contact, fixed contact and lead terminal etc.As shown in Figure 1, the coil 1 of voltage-type starting relay is in parallel with electric motor starting winding 2, and its normally-closed contact 3 is connected with start-up capacitance device 4, and after electric motor starting, the voltage at relay coil two ends increases along with the rising of motor speed.When the rotating speed of motor reaches 70% ~ 80% of rated speed, the voltage on coil makes it to produce electromagnetic attracting force armature, and normally-closed contact is disconnected, and start-up capacitance is ineffective; When motor power-off, normally-closed contact closes under the action of the spring automatically, for motor restart ready.What electromagnetic potential relay should be employing is mechanical contact switch, relies on the effect of spring to carry out folding, may occur the situation of loose contact, cause useful life short after repeatedly using; This voltage relay is made up of metals such as noble metal contact, coil, iron cores in addition, and cost is higher, and price is more expensive.
Utility model content
the utility model provides that a kind of cost is lower, the electronic type voltage relay of long service life.
A kind of electronic type voltage relay described in the utility model, comprise voltage detecting circuit and bidirectional switch circuit, photoelectric coupled device is connected with between voltage detecting circuit and bidirectional switch circuit, the input of voltage detecting circuit is as the input of electronic type voltage relay, the output of voltage detecting circuit is connected with the optical transmitting set of photoelectric coupled device, the input of bidirectional switch circuit connects the optical receiver of photoelectric coupled device, and the output of bidirectional switch circuit is as the output of electronic type voltage relay.
Electronic type voltage relay of the present utility model, its input is equivalent to the terminals of conventional electromagnetic voltage relay solenoid, can with the startup winding parallel of motor, its output is equivalent to the normally-closed contact of conventional electromagnetic voltage relay, can connect with start-up capacitance device.The voltage detecting circuit of this electronic type voltage relay will detect the voltage of input, if the voltage of input is lower than operation voltage value, voltage detecting circuit does not have drive current to export, photoelectric coupled device feed drive signal is to bidirectional switch circuit, at this moment bidirectional switch circuit is in conducting state, if the voltage rise of input is extremely higher than operation voltage value, voltage detecting circuit output driving current signal, photoelectric coupled device feed drive signal is to bidirectional switch circuit, at this moment bidirectional switch circuit is transformed into off-state, if when the voltage of input drops to resetting voltage value again, the drive current that voltage detecting circuit exports will end, at this moment bidirectional switch circuit returns back to conducting state again.Because voltage detecting circuit comprises circuits for triggering, so the operation voltage value of this electronic type voltage relay is higher than resetting voltage value.This electronic type voltage relay can be used as the starting relay of motor, realize controlling the startup of motor, compare traditional electromagnetic potential relay and there is the shortcoming that the life-span is short, cost is high, electronic type voltage relay of the present utility model relies on electronic device can realize the controlling functions of relay completely, long service life, and price is lower, can be widely used in the middle of various motor.
Accompanying drawing explanation
The circuit theory diagrams of the existing electromagnetic potential relay of Fig. 1.
Fig. 2 is a kind of circuit theory diagrams of electronic type voltage relay.
Fig. 3 is the circuit theory diagrams of the utility model as motor starting relay.
Embodiment
A kind of electronic type voltage relay as shown in Figure 2, comprise voltage detecting circuit and bidirectional switch circuit, photoelectric coupled device is connected with between voltage detecting circuit and bidirectional switch circuit, the input of voltage detecting circuit is as the input of electronic type voltage relay, the output of voltage detecting circuit is connected with the optical transmitting set of photoelectric coupled device, the input of bidirectional switch circuit connects the optical receiver of photoelectric coupled device, and the output of bidirectional switch circuit is as the output of electronic type voltage relay.Voltage detecting circuit comprises AC/DC convertor, the input of AC/DC convertor is as the input of voltage detecting circuit, connect successively the 3rd resistance R3, the first triode T6 of the output of AC/DC convertor is connected with the optical transmitting set of photoelectric coupled device T4 with after the second triode T5, is in series with the 4th resistance R4 between the 3rd resistance R3 and the second triode T5 collector electrode.Bidirectional switch circuit comprises the 3rd triode T3, first resistance R1, second resistance R2, field-effect transistor T2 and thyristor T1, the base stage of the 3rd triode T3 is connected with the optical receiver of photoelectric coupled device T4, the collector electrode of the 3rd triode T3 is connected with the grid of field-effect transistor T2, the source electrode of field-effect transistor T2 is connected with the control pole of thyristor T1, the emitter of the 3rd triode T3 is connected with the negative electrode of thyristor T1, the second resistance is connected with between the collector electrode of the 3rd triode T3 and field-effect transistor T2 drain, the first resistance is connected with between the drain electrode of field-effect transistor T2 and the anode of thyristor T1.
The magnitude of voltage that the electric current of the output of voltage detecting circuit can detect with input changes, when the input voltage that voltage detecting circuit detects is higher than operating value voltage, 3rd triode will conducting, thus drag down the driving voltage of field effect transistor gate, at this moment field-effect transistor is in off-state, do not have enough drive currents to export the control pole of thyristor to, at this moment thyristor is in off-state, and namely bidirectional switch circuit is in off-state; When the input voltage that voltage detecting circuit detects drops to resetting voltage value, 3rd triode will be in off-state, the voltage at field effect transistor gate place arrives driving voltage value, at this moment field-effect transistor is in conducting state, thyristor is triggered conducting, namely bidirectional switch circuit is in conducting state, and this electronic type voltage relay can realize disconnecting output according to the situation of input or the control of conducting, can be applicable to electrical equipment and uses as starting relay.
When the utility model is used as the voltage-type starting relay of motor as shown in Figure 1, can one end of voltage input end be connected as common port with one end of bidirectional switch circuit output, as shown in Figure 3.
Claims (3)
1. an electronic type voltage relay, it is characterized in that: comprise voltage detecting circuit and bidirectional switch circuit, photoelectric coupled device is connected with between voltage detecting circuit and bidirectional switch circuit, the input of voltage detecting circuit is as the input of electronic type voltage relay, the output of voltage detecting circuit is connected with the optical transmitting set of photoelectric coupled device, the input of bidirectional switch circuit connects the optical receiver of photoelectric coupled device, and the output of bidirectional switch circuit is as the output of electronic type voltage relay.
2. a kind of electronic type voltage relay according to claim 1, it is characterized in that: described voltage detecting circuit comprises AC/DC convertor, the input of AC/DC convertor is as the input of voltage detecting circuit, the output of AC/DC convertor is connected successively after the 3rd resistance, the first triode and the second triode and is connected with the optical transmitting set of photoelectric coupled device, is in series with the 4th resistance between the 3rd resistance and the second transistor collector.
3. a kind of electronic type voltage relay according to claim 1 and 2, it is characterized in that: described bidirectional switch circuit comprises the 3rd triode, first resistance, second resistance, field-effect transistor and thyristor, the base stage of the 3rd triode is connected with the optical receiver of photoelectric coupled device, the collector electrode of the 3rd triode is connected with the grid of field-effect transistor, the source electrode of field-effect transistor is connected with the control pole of thyristor, the emitter of the 3rd triode is connected with the negative electrode of thyristor, the second resistance is connected with between the collector electrode of the 3rd triode and field-effect transistor drain, the first resistance is connected with between the drain electrode of field-effect transistor and the anode of thyristor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420460538.6U CN204031113U (en) | 2014-08-15 | 2014-08-15 | A kind of electronic type voltage relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420460538.6U CN204031113U (en) | 2014-08-15 | 2014-08-15 | A kind of electronic type voltage relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204031113U true CN204031113U (en) | 2014-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420460538.6U Active CN204031113U (en) | 2014-08-15 | 2014-08-15 | A kind of electronic type voltage relay |
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| CN (1) | CN204031113U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI578363B (en) * | 2015-11-13 | 2017-04-11 | 環旭電子股份有限公司 | Electronic relay for starter motor |
-
2014
- 2014-08-15 CN CN201420460538.6U patent/CN204031113U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI578363B (en) * | 2015-11-13 | 2017-04-11 | 環旭電子股份有限公司 | Electronic relay for starter motor |
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