CN214254275U - Relay control device for electrical equipment - Google Patents
Relay control device for electrical equipment Download PDFInfo
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- CN214254275U CN214254275U CN202120651768.0U CN202120651768U CN214254275U CN 214254275 U CN214254275 U CN 214254275U CN 202120651768 U CN202120651768 U CN 202120651768U CN 214254275 U CN214254275 U CN 214254275U
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Abstract
The utility model relates to a relay control device for electrical equipment, including the relay, rectifier circuit, voltage stabilizing circuit, selector switch, first switch tube and second switch tube, the relay includes control coil, rectifier circuit becomes required direct current with 220V alternating current rectification, it can drop into the power according to actual conditions to combine selector switch, and, carry out the steady voltage through voltage stabilizing circuit, make output give the stable direct current of control coil, avoid leading to the unable normal reliable action of contact switch because of the power fluctuation, and, first switch tube and the parallelly connected setting of second switch tube, as long as there is a switch tube to switch on, just can realize that control coil is electrified, even if there is a switch tube trouble, still can control the relay and switch on, from this one side of switch tube that is used for the control power to insert, promote the stability and the reliability of relay action.
Description
Technical Field
The utility model relates to a relay control device for electrical equipment.
Background
The electric equipment has a wide application range, and if the electric equipment has a switch control function, the electric equipment is provided with a relay, and the conduction state of each contact switch of the relay is controlled by controlling the power-on state of a control coil of the relay.
The relay control is essentially the power-on control of the control coil of the relay, whether the contact switch of the relay can reliably work depends on whether the power supply accessed by the control coil is normally stable or not, and whether the power supply is normally stable or not is divided into two conditions: (1) whether the power supply is stable or not, (2) whether a switching tube for controlling the power supply to be connected is stable and reliable or not. If the power supply connected to the control coil is unstable, the contact switch may not operate normally and reliably.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a relay control device for electrical equipment.
A relay control device for electrical equipment comprises a relay, a rectifying circuit, a voltage stabilizing circuit, a selection switch, a first switch tube and a second switch tube, wherein the relay comprises a control coil;
the alternating current side of the rectifying circuit is used for inputting 220V alternating current, the rectifying circuit is used for rectifying the 220V alternating current into direct current required by the control coil, the direct current side of the rectifying circuit is connected with the first input end of the selection switch, the second input end of the selection switch is used for inputting external direct current, the external direct current is also the direct current required by the control coil, the output end of the selection switch is connected with the input end of the control coil through the voltage stabilizing circuit, the output end of the control coil is connected with the input end of the first switch tube, the output end of the first switch tube is grounded, and the first switch tube and the second switch tube are connected in parallel;
the control end of the first switch tube is used for inputting a first conduction control signal, and the control end of the second switch tube is used for inputting a second conduction control signal.
In a specific embodiment, the relay control device for electrical equipment further comprises a first high-level signal generating circuit and a second high-level signal generating circuit, the first high-level signal generating circuit and the second high-level signal generating circuit are both used for generating continuous high-level signals according to rising edge signals, the output end of the first high-level signal generating circuit is connected with the control end of the first switch tube, and the output end of the second high-level signal generating circuit is connected with the control end of the second switch tube; the first switch tube and the second switch tube are both used for being conducted when a high-level signal is input.
In one embodiment, the relay control device for electrical equipment further includes a third switching tube, and the third switching tube is arranged in series between the output end of the first switching tube and the grounding point.
In one embodiment, the relay control device for electrical equipment further comprises a high-low level signal generating circuit, wherein the high-low level signal generating circuit is used for generating a continuous low level signal according to a falling edge signal and generating a continuous high level signal according to a rising edge signal, and the output end of the high-low level signal generating circuit is connected with the control end of the third switching tube; the third switching tube is disconnected when a low level signal is input and is connected when a high level signal is input.
In one embodiment, the relay control device for electrical equipment further includes a protection resistor, the protection resistor is arranged in series between the output end of the first switching tube and a grounding point, and the protection resistor is used for being in a failure state and being in an off state when a current flowing through the protection resistor is too large.
In one embodiment, the relay control device for electrical equipment further includes a diode and a capacitor, a cathode of the diode is connected to the input end of the control coil, an anode of the diode is connected to the output end of the control coil, and the capacitor is connected in parallel with the diode.
The utility model has the advantages that: the 220V alternating current can be rectified into direct current required by a control coil of the relay through the rectifying circuit, and two input ends of the selector switch are respectively connected with the direct current obtained by rectification of the rectifying circuit and external direct current, so that the 220V alternating current or the external direct current can be connected according to actual conditions, the power supply requirement of the control coil of the relay is met, and the direct current is output to the control coil after voltage stabilization through the voltage stabilizing circuit no matter the output of the rectifying circuit or the external direct current, so that the direct current output to the control coil is stable, and the problem that the contact switch cannot normally and reliably act due to fluctuation of the direct current is prevented; be provided with two switch tubes, these two switch tube parallel connection, these two switch tubes input the control signal that switches on that corresponds respectively, consequently, as long as have a switch tube to switch on, just can make control coil electrified, so, even if there is a switch tube trouble, still can control the relay and switch on, from this aspect of switch tube that is used for the control power to insert, promote the stability and the reliability of relay action.
Drawings
Fig. 1 is a circuit diagram of a relay control device for an electrical apparatus.
Detailed Description
The present embodiment provides a relay control device for an electrical apparatus, as shown in fig. 1, including a relay, a rectifying circuit, a voltage stabilizing circuit, a selector switch K1, a first switch tube Q1, and a second switch tube Q2.
The relay is a conventional relay device, and includes a control coil T1, and further includes a contact switch S1. The rectifying circuit is a conventional alternating current-to-direct current power conversion circuit, the alternating current side of the rectifying circuit is used for inputting 220V alternating current, the rectifying circuit is used for rectifying the 220V alternating current into direct current, and the direct current is used for supplying power to the control coil T1, so that the direct current rectified by the rectifying circuit is the direct current required by the control coil T1. The selector switch K1 is a conventional manual selector switch, such as: the selector switch K1 comprises a first input end, a second input end and an output end, and is used for realizing the gating of the first input end and the output end or the gating of the second input end and the output end. The voltage stabilizing circuit is a conventional voltage stabilizing circuit, such as a voltage regulator tube, the voltage stabilizing value of the voltage regulator tube is the direct current voltage value required by the control coil T1, and the voltage stabilizing circuit is used for stabilizing the direct current output by the output end of the selection switch K1 into the direct current required by the control coil T1 so as to prevent voltage fluctuation. The first switch transistor Q1 and the second switch transistor Q2 are conventional switch transistor devices, such as a triode, a MOS transistor, etc. In this embodiment, the first switch Q1 and the second switch Q2 are triodes, specifically NPN-type triodes. Then, the first switch tube Q1 and the second switch tube Q2 are turned on when a high level signal is inputted, and correspondingly, may be turned off when a low level signal is inputted.
As shown in fig. 1, the dc side of the rectifier circuit is connected to a first input terminal of the selection switch K1. The second input end of the selector switch K1 is used for inputting external direct current (for example, connecting to an external direct current power supply), the external direct current is also the direct current required by the control coil T1, the output end of the selector switch K1 is connected to the input end of the control coil T1 through a voltage stabilizing circuit, the output end of the control coil T1 is connected to the input end of the first switch tube Q1, the output end of the first switch tube Q1 is grounded, and the first switch tube Q1 and the second switch tube Q2 are connected in parallel.
The control terminal of the first switch transistor Q1 is used for inputting a first conduction control signal, and the control terminal of the second switch transistor Q2 is used for inputting a second conduction control signal. The first conduction control signal and the second conduction control signal are different conduction control signals and can be output by a controller, specifically: the controller is provided with two conduction control signal output pins which respectively output a first conduction control signal and a second conduction control signal.
In this embodiment, the relay control device for electrical equipment further includes a first high level signal generating circuit and a second high level signal generating circuit, an output end of the first high level signal generating circuit is connected to a control end of the first switching tube Q1, and an output end of the second high level signal generating circuit is connected to a control end of the second switching tube Q2. The first high level signal generating circuit and the second high level signal generating circuit have the same function and are both used for generating continuous high level signals according to rising edge signals, for example, the first high level signal generating circuit is used, a first conduction control signal output pin of the controller is connected with an input end of the first high level signal generating circuit, when the first high level signal generating circuit receives the rising edge signals output by the first conduction control signal output pin of the controller, the first high level signal generating circuit continuously outputs high level signals, even if signals output by the first conduction control signal output pin of a subsequent controller change, for example, the signals change into low level signals, the first high level signal generating circuit still continuously outputs high level signals. As a specific implementation manner, both the first high-level signal generating circuit and the second high-level signal generating circuit may be conventional flip-flop circuits, and the flip-flop circuits are triggered by the rising edge signals and output high-level signals after being triggered. Alternatively, the first high-level signal generating circuit and the second high-level signal generating circuit may also be control chips, a software program is preset in the control chips, and when the rising edge signal is received, the software program is executed, so as to output a high-level signal.
Therefore, the first high-level signal generating circuit and the second high-level signal generating circuit are arranged, so long as the first high-level signal generating circuit and the second high-level signal generating circuit are triggered to output high-level signals, even if control signals of input ends of the first high-level signal generating circuit and the second high-level signal generating circuit are changed, the conducting state of the first switch tube Q1 and the conducting state of the second switch tube Q2 cannot be changed, the conducting state of the relay cannot be changed, and the reliability of relay control is improved.
In this embodiment, the relay control device for electrical equipment further includes a third switching tube Q3, and the third switching tube Q3 is a conventional switching tube device, such as a triode, a MOS transistor, or the like. In this embodiment, the third switching transistor Q3 is a transistor, specifically, an NPN transistor. Then, the third switching tube Q3 is turned on when a high level signal is inputted, and is turned off when a low level signal is inputted. As shown in fig. 1, the third switching tube Q3 is serially connected between the output terminal of the first switching tube Q1 and the ground point. The control end of the third switch tube Q3 is used for inputting an on-off control signal, wherein the on-off control signal includes an off control signal and a third on control signal, when the off control signal is inputted, the third switch tube Q3 is turned off under the action of the off control signal, and when the third on control signal is inputted, the third switch tube Q3 is turned on under the action of the third on control signal. In this embodiment, the on-off control signal may also be output by the controller, that is, the controller has an on-off control signal output pin. The third switching tube Q3 is provided, so that the reliability of the relay opening control can be improved. In another embodiment, the first switch tube Q1 and the second switch tube Q2 may control the relay to be turned off, so that the third switch tube Q3 is not required.
Further, in order to improve the control reliability, the relay control device for the electrical equipment further comprises a high-low level signal generating circuit. The high-low level signal generating circuit is used for generating a continuous low level signal according to the falling edge signal and generating a continuous high level signal according to the rising edge signal. The output end of the high-low level signal generating circuit is connected with the control end of the third switching tube Q3. Then, when the high-low level signal generating circuit receives a falling edge signal output by the on-off control signal output pin of the controller, the high-low level signal generating circuit continuously outputs a low level signal, and when the high-low level signal generating circuit receives a rising edge signal output by the on-off control signal output pin of the controller, the high-low level signal generating circuit continuously outputs a high level signal. As a specific embodiment, the high-low level signal generating circuit may be a conventional flip-flop circuit, and the flip-flop circuit is triggered by a falling edge signal or a rising edge signal, and outputs a low level signal after being triggered by the falling edge signal, and outputs a high level signal after being triggered by the rising edge signal. Or, the high-low level signal generating circuit may also be a control chip, and a software program is preset in the control chip, and when a falling edge signal is received, the software program is executed to output a low level signal, and when a rising edge signal is received, the software program is executed to output a high level signal. Then, when the first switch Q1 and the second switch Q2 are controlled to be turned on by the first high level signal generating circuit and the second high level signal generating circuit, the third switch Q3 needs to be controlled to be turned on by the high low level signal generating circuit, so as to enable the control coil T1 to be powered.
In this embodiment, the relay control device for electrical equipment further includes a protection resistor R1, the protection resistor R1 is serially connected between the output terminal of the first switching tube Q1 and the ground point, and as a specific embodiment, the protection resistor R1 is serially connected between the output terminal of the third switching tube Q3 and the ground point. The protection resistor R1 is used to fail to be in an off state when the current flowing through it is too large, such as: if each switching tube Q1 is broken down, the voltage and current at two ends of the protection resistor R1 are increased, and the protection resistor R1 is in an off state due to failure, so that the control coil T1 loses power, the safety of a circuit is improved, and the relay is prevented from being damaged.
In this embodiment, the relay control device for electric equipment further includes a diode D1 and a capacitor C1, a cathode of the diode D1 is connected to an input terminal of the control coil T1, an anode of the diode D1 is connected to an output terminal of the control coil T1, and the capacitor C1 is connected in parallel to the diode D1. When the control coil T1 is controlled to be switched on and switched off, the capacitor C1 and the diode D1 are used for absorbing the transient voltage spike generated by the control coil T1, so that other related electronic devices are prevented from being damaged by the transient voltage spike, and the operation reliability of the circuit is improved.
Claims (6)
1. A relay control device for electrical equipment is characterized by comprising a relay, a rectifying circuit, a voltage stabilizing circuit, a selection switch, a first switch tube and a second switch tube, wherein the relay comprises a control coil;
the alternating current side of the rectifying circuit is used for inputting 220V alternating current, the rectifying circuit is used for rectifying the 220V alternating current into direct current required by the control coil, the direct current side of the rectifying circuit is connected with the first input end of the selection switch, the second input end of the selection switch is used for inputting external direct current, the external direct current is also the direct current required by the control coil, the output end of the selection switch is connected with the input end of the control coil through the voltage stabilizing circuit, the output end of the control coil is connected with the input end of the first switch tube, the output end of the first switch tube is grounded, and the first switch tube and the second switch tube are connected in parallel;
the control end of the first switch tube is used for inputting a first conduction control signal, and the control end of the second switch tube is used for inputting a second conduction control signal.
2. The relay control device for the electrical equipment as claimed in claim 1, further comprising a first high level signal generating circuit and a second high level signal generating circuit, wherein the first high level signal generating circuit and the second high level signal generating circuit are both used for generating continuous high level signals according to rising edge signals, the output end of the first high level signal generating circuit is connected with the control end of the first switch tube, and the output end of the second high level signal generating circuit is connected with the control end of the second switch tube; the first switch tube and the second switch tube are both used for being conducted when a high-level signal is input.
3. The relay control device for electric equipment as claimed in claim 1, further comprising a third switching tube provided in series between an output terminal of the first switching tube and a ground point.
4. The relay control device for the electrical equipment as claimed in claim 3, further comprising a high-low level signal generating circuit for generating a continuous low level signal according to a falling edge signal and a continuous high level signal according to a rising edge signal, wherein an output terminal of the high-low level signal generating circuit is connected to the control terminal of the third switching tube; the third switching tube is disconnected when a low level signal is input and is connected when a high level signal is input.
5. The relay control device for electrical equipment as claimed in claim 1, further comprising a protection resistor connected in series between the output terminal of the first switching tube and a ground point, wherein the protection resistor is configured to fail to be in an off state when a current flowing therethrough is excessive.
6. The relay control device for electric equipment according to claim 1, further comprising a diode and a capacitor, wherein a cathode of the diode is connected to an input terminal of the control coil, an anode of the diode is connected to an output terminal of the control coil, and the capacitor is connected in parallel to the diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120651768.0U CN214254275U (en) | 2021-03-31 | 2021-03-31 | Relay control device for electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120651768.0U CN214254275U (en) | 2021-03-31 | 2021-03-31 | Relay control device for electrical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214254275U true CN214254275U (en) | 2021-09-21 |
Family
ID=77728599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120651768.0U Expired - Fee Related CN214254275U (en) | 2021-03-31 | 2021-03-31 | Relay control device for electrical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214254275U (en) |
-
2021
- 2021-03-31 CN CN202120651768.0U patent/CN214254275U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210921 |