CN214542042U - Electromagnet on-off control circuit - Google Patents
Electromagnet on-off control circuit Download PDFInfo
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- CN214542042U CN214542042U CN202121071464.3U CN202121071464U CN214542042U CN 214542042 U CN214542042 U CN 214542042U CN 202121071464 U CN202121071464 U CN 202121071464U CN 214542042 U CN214542042 U CN 214542042U
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- electromagnet
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Abstract
The utility model provides an electro-magnet on-off control circuit, electro-magnet and power are connected to control circuit's output, control circuit includes optical coupler, triode, field effect transistor, the signal of telecommunication input is connected to optical coupler's input, optical coupler's output is connected the base of triode, the projecting pole of triode is connected field effect transistor's grid, field effect transistor's drain electrode is connected electro-magnet and power. After the grid voltage of the field effect tube is pulled down through the triode, the field effect tube is not conducted, and then the electromagnet is disconnected. The power supply does not need to be additionally arranged in the control circuit, the input voltage of the control circuit can be basically the same as the control voltage of the electromagnet, the electromagnet control circuit is optimized, and the on-off of the electromagnet can be controlled more accurately.
Description
Technical Field
The utility model relates to a field of electrified display particularly, relates to be applied to electro-magnet on-off control circuit in electrified display.
Background
The electromagnet is a device which generates electromagnetism when being electrified, and the electromagnet is widely applied to electric appliances, detection equipment and large mechanical devices. In the existing electromagnet control circuit, relay control is mostly adopted, when the relay is adopted to control the electromagnet to be switched on and off, a power supply needs to be provided for a control loop of the relay independently, and the power supply circuit and the control circuit are complex, high in cost and large in circuit size. The market urgently needs a simplified control circuit, and the control circuit power can be shared with the electromagnet power, so that the cost is reduced, the circuit size is reduced, and meanwhile, the control accuracy is ensured.
In view of the above, the inventors of the present invention have made a study of the prior art and then have made the present application.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electro-magnet on-off control circuit aims at optimizing electro-magnet control circuit, improves the precision of control.
For solving the technical problem, the utility model provides an electro-magnet on-off control circuit, electro-magnet and power are connected to control circuit's output, control circuit includes optical coupler, triode, field effect transistor, the signal of telecommunication input is connected to optical coupler's input, optical coupler's output is connected the base of triode, the projecting pole of triode is connected field effect transistor's grid, field effect transistor's drain electrode is connected electro-magnet and power.
In one embodiment, the control circuit includes a voltage holding circuit, and the voltage holding circuit is disposed between the transistor and the fet.
In one embodiment, the transistor is a PNP transistor.
In one embodiment, the drain of the field effect transistor is connected with a rectifier bridge, and the rectifier bridge is connected with the electromagnet and the power supply.
In an embodiment, the voltage holding circuit includes a first filter and a second filter, two ends of the first filter are respectively connected to the emitter of the triode and the gate of the field effect transistor, and two ends of the second filter are respectively connected to the emitter of the triode and the drain of the field effect transistor.
In an embodiment, the first filter includes a first capacitor, a second capacitor, a first resistor, and a second resistor, an emitter of the triode is connected to an anode of the first capacitor, one end of the first resistor is connected to the second capacitor and the second resistor, cathodes of the first capacitor and the second capacitor are grounded, and the other end of the second resistor is connected to a gate of the fet.
In an embodiment, the second filter includes a third resistor, a fourth resistor, and a diode, one end of the third resistor is connected to the emitter of the triode, the other end of the third resistor and the cathode of the diode are both connected to one end of the fourth resistor, the anode of the diode is grounded, and the other end of the fourth resistor is connected to the drain of the field effect transistor.
By adopting the technical scheme, the utility model discloses can gain following technological effect:
after the grid voltage of the field effect tube is pulled down through the triode, the field effect tube is not conducted, and then the electromagnet is disconnected. The power supply does not need to be additionally arranged in the control circuit, the input voltage of the control circuit can be basically the same as the control voltage of the electromagnet, the electromagnet control circuit is optimized, and the on-off of the electromagnet can be controlled more accurately.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a block diagram of a control circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a control circuit according to an embodiment of the present invention.
1. An electrical signal module; 2. a control circuit; 3. an electromagnet.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 and 2, an input end of the control circuit 2 is connected to the electric signal module 1, and an output end of the control circuit 2 is connected to the electromagnet 3. The control circuit 2 comprises an optical coupler U1, a triode Q2 and a field effect transistor Q1, wherein the input end of the optical coupler U1 is connected with an electric signal input, the output end of the optical coupler U1 is connected with the base electrode of the triode Q2, the emitter electrode of the triode Q2 is connected with the grid electrode of the field effect transistor Q1, and the drain electrode of the field effect transistor Q1 is connected with the electromagnet 3.
After the gate voltage of the fet Q1 is pulled low by the transistor Q2, the fet Q1 is turned off and the electromagnet 3 is turned off. The power supply does not need to be additionally arranged in the control circuit 2, the input voltage of the control circuit 2 can be basically the same as the control voltage of the electromagnet 3, the control circuit 2 of the electromagnet 3 is optimized, and the on-off of the electromagnet 3 can be controlled more accurately.
The transistor Q2 is a PNP transistor.
The control circuit 2 includes a voltage holding circuit provided between the transistor Q2 and the field effect transistor Q1. The voltage holding circuit comprises a first filter and a second filter, wherein two ends of the first filter are respectively connected with an emitting electrode of the triode Q2 and a grid electrode of the field-effect tube Q1, and two ends of the second filter are respectively connected with an emitting electrode of the triode Q2 and a drain electrode of the field-effect tube.
The drain electrode of the field effect transistor Q1 is connected with a rectifier bridge DB1, and the rectifier bridge DB1 is connected with the electromagnet 3 and a power supply.
Specifically, the optical coupler U1 adopts a triode-type photoelectric coupler, the input end of the optical coupler U1 is connected to the electrical signal module 1, and the output end of the optical coupler U1 is connected to the base of the triode Q2.
The source of transistor Q2 is connected to ground and the emitter of transistor Q2 is connected to a voltage holding circuit. One end of the fifth resistor R16 is a base of the transistor Q2, and the other end thereof is connected to an emitter of the transistor Q2.
The first filter comprises a first capacitor C22, a second capacitor C23, a first resistor R18 and a second resistor R31, an emitter of the triode Q2 is connected with the anode of the first capacitor C22, one end of the first resistor R18 is connected with the second capacitor C23 and the second resistor R31, cathodes of the first capacitor C22 and the second capacitor C23 are grounded, and the other end of the second resistor R31 is connected with the gate of the field effect transistor Q1.
The second filter comprises a third resistor R17, a fourth resistor R20 and a diode D11, one end of the third resistor R17 is connected with an emitter of a triode Q2, the other end of the third resistor R17 and a cathode of a diode D11 are both connected with one end of a fourth resistor R20, an anode of the diode D11 is grounded, and the other end of the fourth resistor R20 is connected with a drain of a field effect transistor Q1.
The drain electrode of the field effect transistor Q1 is connected with a rectifier bridge DB1, one pin of the rectifier bridge DB1 is grounded, and the other two pins of the rectifier bridge DB1 are connected with the electromagnet 3 and a power supply.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The electromagnet on-off control circuit is characterized in that the control circuit comprises an optical coupler, a triode and a field effect tube, wherein the input end of the optical coupler is connected with an electric signal input, the output end of the optical coupler is connected with the base electrode of the triode, the emitting electrode of the triode is connected with the grid electrode of the field effect tube, and the drain electrode of the field effect tube is connected with the electromagnet and the power supply.
2. The control circuit of claim 1, wherein the control circuit comprises a voltage holding circuit, the voltage holding circuit being disposed between the transistor and the fet.
3. The control circuit of claim 1, wherein the transistor is a PNP transistor.
4. The control circuit of claim 1, wherein a rectifier bridge is connected to the drain of the fet, the rectifier bridge being connected to the electromagnet and the power source.
5. The control circuit of claim 2, wherein the voltage holding circuit comprises a first filter and a second filter, wherein two ends of the first filter are respectively connected to the emitter of the triode and the gate of the field effect transistor, and two ends of the second filter are respectively connected to the emitter of the triode and the drain of the field effect transistor.
6. The control circuit according to claim 5, wherein the first filter comprises a first capacitor, a second capacitor, a first resistor, and a second resistor, wherein an emitter of the transistor is connected to an anode of the first capacitor, one end of the first resistor is connected to the second capacitor and the second resistor, cathodes of the first capacitor and the second capacitor are grounded, and the other end of the second resistor is connected to a gate of the fet.
7. The control circuit according to claim 5, wherein the second filter includes a third resistor, a fourth resistor, and a diode, one end of the third resistor is connected to the emitter of the transistor, the other end of the third resistor and the cathode of the diode are both connected to one end of the fourth resistor, the anode of the diode is grounded, and the other end of the fourth resistor is connected to the drain of the fet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121071464.3U CN214542042U (en) | 2021-05-19 | 2021-05-19 | Electromagnet on-off control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121071464.3U CN214542042U (en) | 2021-05-19 | 2021-05-19 | Electromagnet on-off control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN214542042U true CN214542042U (en) | 2021-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121071464.3U Active CN214542042U (en) | 2021-05-19 | 2021-05-19 | Electromagnet on-off control circuit |
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| CN (1) | CN214542042U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115497204A (en) * | 2022-09-23 | 2022-12-20 | 泉州砾鹰石科技有限公司 | Circuit for preventing strong magnetic interference from causing failure of access control system |
-
2021
- 2021-05-19 CN CN202121071464.3U patent/CN214542042U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115497204A (en) * | 2022-09-23 | 2022-12-20 | 泉州砾鹰石科技有限公司 | Circuit for preventing strong magnetic interference from causing failure of access control system |
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