CN219626553U - Control device for preventing relay contact adhesion - Google Patents
Control device for preventing relay contact adhesion Download PDFInfo
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- CN219626553U CN219626553U CN202321015892.3U CN202321015892U CN219626553U CN 219626553 U CN219626553 U CN 219626553U CN 202321015892 U CN202321015892 U CN 202321015892U CN 219626553 U CN219626553 U CN 219626553U
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Abstract
The utility model discloses a control device for preventing relay contacts from being adhered, which comprises a controller, a zero-crossing detection unit, a relay unit, a current sampling unit, a communication unit, a display unit and a power supply unit, wherein the power supply unit is electrically connected with the controller through the zero-crossing detection unit, the controller is electrically connected with the relay unit, the output end of the relay unit is electrically connected with the current sampling unit, the communication unit and the display unit are electrically connected with the controller, the controller drives the relay unit to act when in zero potential, the relay unit is closed when in zero potential, surge current is small, and the risk of relay contacts adhesion is avoided.
Description
Technical Field
The utility model belongs to the technical field of relays, and particularly relates to a control device for preventing relay contacts from adhesion.
Background
At present, with the continuous perfection of an automatic control circuit, various types of loads connected with the rear end of a control output relay on a controller are correspondingly increased, wherein capacitive loads and inductive loads with different sizes can generate surge currents of more than tens times at the moment of contact attraction and disconnection, especially, in the process of switching on and off of a special phase angle of an alternating current power supply, the contacts of the relay are possibly oxidized and damaged by sequential switching, adhesion phenomenon is caused, finally, the control of the whole equipment is invalid, serious consequences are caused, in addition, the contact state of the relay cannot be known, and after the contacts are adhered, equipment replacement cannot be performed timely.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a control device for preventing relay contacts from adhesion.
The specific scheme is as follows:
the utility model provides a prevent controlling means of relay contact adhesion, includes controller, zero crossing detection unit, relay unit, current sampling unit, communication unit, display element and power supply unit, power supply unit pass through zero crossing detection unit with the controller electricity is connected, the controller with the relay unit electricity is connected, the output and the current sampling unit electricity of relay unit are connected, current sampling unit, communication unit and display element all with the controller electricity is connected.
The power supply unit comprises an alternating current input end and a voltage stabilizing unit, wherein the alternating current input end is electrically connected with the controller through a zero-crossing detection unit, and the controller, the zero-crossing detection unit, the relay unit, the communication unit and the display unit are all electrically connected with the voltage stabilizing unit.
The voltage stabilizing unit comprises a step-down transformer, a bridge rectifier circuit and a three-terminal voltage stabilizer, wherein the alternating current input end is electrically connected with the bridge rectifier circuit through the step-down transformer, and the bridge rectifier circuit is electrically connected with the three-terminal voltage stabilizer.
The zero-crossing detection unit comprises a first voltage dividing resistor and a comparator, the power supply unit is electrically connected with the comparator through the first voltage dividing resistor, and the comparator is electrically connected with the controller.
The relay unit comprises a driving triode and a relay, the controller is connected with the relay through the driving triode, the relay comprises a protective diode, a coil, a switching end and a normally open contact, the normally open contact is in contact connection with the switching end, the switching end is connected with the coil through electromagnetic induction, one end of the coil is electrically connected with the driving triode, the other end of the coil is electrically connected with the power supply unit, and the two ends of the coil are connected with the protective diode in parallel.
The current sampling unit comprises a sampling resistor, a second voltage-dividing resistor and a sampling triode, wherein the output end of the relay unit is electrically connected with the sampling resistor, the sampling resistor is electrically connected with the second voltage-dividing resistor, and the second voltage-dividing resistor is electrically connected with the controller through the sampling triode.
The communication unit is any one of a nine-pin serial port, a 2G module, a 4G module or an NB module, and the display unit is a liquid crystal display screen.
The utility model discloses a control device for preventing relay contacts from adhering, which comprises a controller, a zero crossing detection unit and a relay unit, wherein the zero crossing detection unit is used for detecting zero potential of alternating current and inputting the zero potential into the controller, the controller drives the relay unit to act when the zero potential is applied, the relay unit is closed when the zero potential is applied, surge current is smaller, the risk of relay contacts adhering is avoided, in addition, the current sampling unit can feed back the opening or closing state of the relay unit into the controller, the controller displays the opening and closing state of the current relay through a display unit, or the opening and closing state of the relay is remotely transmitted through a communication unit, so that the state of the relay can be acquired in time conveniently.
Drawings
Fig. 1 is a schematic view of the overall structure of the present utility model.
Fig. 2 is a schematic circuit configuration diagram of the zero-crossing detection unit.
Fig. 3 is a schematic circuit configuration of the power supply unit.
Fig. 4 is a schematic circuit configuration diagram of the relay unit and the current employing unit.
Fig. 5 is a schematic diagram of the time points at which the controller drives the relay to operate.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the present utility model. It will be apparent to those skilled in the art that the described embodiments are only a part, but not all, of the implementations of the utility model, and that all other embodiments, based on which those skilled in the art will come to lie within the scope of the utility model without making any inventive effort.
As shown in fig. 1, a control device for preventing relay contact adhesion comprises a controller 6, a zero-crossing detection unit 9, a relay unit 4, a current sampling unit 5, a communication unit 8, a display unit 7 and a power supply unit 1, wherein the power supply unit 1 is electrically connected with the controller 6 through the zero-crossing detection unit 9, the controller 6 is electrically connected with the relay unit 4, the output end of the relay unit 4 is electrically connected with the current sampling unit 5, and the current sampling unit 5, the communication unit 8 and the display unit 7 are electrically connected with the controller 6.
The power supply unit 1 comprises an alternating current input end 2 and a voltage stabilizing unit 3, wherein the alternating current input end 2 is electrically connected with the controller 6 through a zero-crossing detection unit 9, and the controller 6, the zero-crossing detection unit 9, the relay unit 4, the communication unit 8 and the display unit 7 are all electrically connected with the voltage stabilizing unit 3.
As shown in fig. 3, the voltage stabilizing unit 3 includes a step-down transformer 12, a bridge rectifier circuit 13 and a three-terminal voltage stabilizer, the ac input terminal 2 is electrically connected to the bridge rectifier circuit 13 through the step-down transformer 12, the bridge rectifier circuit 13 is electrically connected to the three-terminal voltage stabilizer, the three-terminal voltage stabilizer includes 7912 and 7805, the 7912 is a 12V voltage stabilizer, and the 7805 is a 5V voltage stabilizer.
The voltage stabilizing unit 3 steps down and sorts 50HZ and 220V alternating current into a 12V direct current power supply and a 5V direct current power supply, and provides proper working voltage for the normal work of the controller 6, the zero crossing detection unit 9, the relay unit 4 and the communication unit 8.
As shown in fig. 2, the zero-crossing detection unit 9 includes a first voltage-dividing resistor 10 and a comparator 11, the power supply unit 1 is electrically connected to the comparator 11 through the first voltage-dividing resistor 10, and the comparator 11 is electrically connected to the controller 6. The 220V alternating current is attenuated after being divided by the first voltage dividing resistor 10, the divided voltage is input to the positive end of the comparator 11, the reverse end of the voltage divider 11 is connected with the power ground and corresponds to zero, when the alternating current input exceeds zero reference voltage, the output state of the comparator 11 jumps once, and the controller can detect the zero moment of the alternating current according to the jump signal.
As shown in fig. 4, the relay unit 4 includes a driving triode 14 and a relay, the controller 6 is connected with the relay through the driving triode 14, the relay includes a protection diode 16, a coil 15, a switching end 18 and a normally open contact 17, the normally open contact 17 is connected with the switching end 18 in a contact manner, the switching end 18 is connected with the coil 15 by electromagnetic induction, one end of the coil 15 is electrically connected with the driving triode 14, the other end of the coil 15 is electrically connected with the power supply unit 1, and two ends of the coil 15 are connected with the protection diode 16 in parallel.
The controller 6 sends different high and low level signals to the driving triode 14 to drive the relay to open and close. In this embodiment, the controller 6 sends a high-level signal to the driving triode 14, the driving triode 14 is electrically conducted, after the driving triode 14 is conducted, the coil 15 of the relay is powered on, and after the coil 15 is powered on, the switching end 18 contacts and conducts with the normally open contact 17 under the action of electromagnetic force, so that the load 22 starts to work, and meanwhile, current is collected in the current sampling unit 5 to flow.
The controller 6 sends a low level signal to the driving transistor 14, the driving transistor 14 is in a cut-off state, at this time, the relay coil 15 is powered down, the switching end 18 is disconnected from the contact 17, the load 22 stops working, and no current flows in the current sampling unit 5.
The actuation time and the opening time of the relay contacts, i.e. the time taken by the switching end 18 from the start of the action to the complete contact with the contact 17, and the opening time taken by the switching end 18 from the complete contact with the contact 17 to the complete disconnection of the switching end 18 from the contact, are identical to those skilled in the art.
As shown in fig. 5, for the alternating current of 50Hz,220v, the period is a fixed value, i.e. 1/50 hz=20ms, in one period, there are two zero values, after the zero-crossing detection unit detects one zero value, the controller delays for a period of time, and when the next zero comes, the relay unit 4 is driven to act, so that when the relay in the relay unit 4 acts, there is a smaller surge current, and the phenomenon of adhesion of the relay contacts is avoided.
The suction time or the disconnection time of the relay contact is ts obtained by measuring the relay for a plurality of times, the suction time or the disconnection time ts of the relay contact is prestored in the controller 6, when the zero crossing detection unit 9 detects the zero point of alternating current, in order to ensure that the relay is in a suction or disconnection state when the zero point of the next alternating current is detected, a driving signal is required to be sent to the relay unit 4 in advance of the time ts before the zero point of the next alternating current is reached, so that the relay is in the suction or disconnection state when the zero point of the alternating current is just ensured, and the adhesion of the contact is avoided.
The controller 6 is a singlechip, the singlechip comprises a timer, the timer starts to work after the controller 6 detects a zero point, and when the timing duration tm=10-ts of the timer, the controller 6 sends a driving signal to the relay unit 4, so that the relay is in a suction or disconnection state when the zero point is exchanged, and the adhesion of contacts is avoided.
The current sampling unit 5 comprises a sampling resistor 21, a second voltage-dividing resistor 19 and a sampling triode 20, the output end of the relay unit 4 is electrically connected with the sampling resistor 21, the sampling resistor 21 is electrically connected with the second voltage-dividing resistor 19, and the second voltage-dividing resistor 19 is electrically connected with the controller 6 through the sampling triode 20.
The communication unit 8 is any one of a nine-pin serial port, a 2G module, a 4G module or an NB module, and the display unit 7 is a liquid crystal display.
When the relay contacts are on, when current flows in the sampling resistor 21, the sampling triode 20 is in a conducting state, at the moment, the sampling triode 20 sends a low-level signal to the controller 6, and the controller 6 sends the low-level signal to the display unit for display or carries out remote transmission through the communication unit 8 so as to refer to the relay state manually.
When the relay contacts are disconnected, when no current flows in the sampling resistor 21, the sampling triode 20 is in a cut-off state, at the moment, the sampling triode 20 sends a high-level signal to the controller 6, and the controller 6 sends the high-level signal to the display unit for display or carries out remote transmission through the communication unit 8 so as to refer to the relay state manually.
The control device for preventing relay contact adhesion comprises the following specific working processes:
after the zero-crossing detection unit 9 detects the zero value of the alternating current, the zero-crossing detection unit 9 sends a jump signal to the controller 6, the time ts for switching on or off the relay contact and the half-period time value of the alternating current are stored in the controller 6, after the controller 6 receives the jump signal, timing is started, when the timing value reaches 10ms-ts, the controller 6 sends a high-level signal or a low-level signal to the relay unit, the high-level signal drives the relay contact to be switched on, at the moment, a load connected with the rear end of the relay starts to work, and the low-level signal drives the relay contact to be switched off, at the moment, the load connected with the rear end of the relay stops working;
when the relay is turned on or off, the current sampling unit performs current sampling, the sampling triode 20 sends different level signals to the controller 6, and the controller 6 sends the different level signals to the display unit for display or performs remote transmission through the communication unit 8 so as to refer to the relay state for manual inspection.
The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.
Claims (7)
1. A control device for preventing relay contact adhesion is characterized in that: including controller (6), zero crossing detection unit (9), relay unit (4), current sampling unit (5), communication unit (8), display element (7) and power supply unit (1), power supply unit (1) pass through zero crossing detection unit (9) with controller (6) electricity is connected, controller (6) with relay unit (4) electricity is connected, the output and the current sampling unit (5) electricity of relay unit (4) are connected, current sampling unit (5), communication unit (8) and display element (7) all with controller (6) electricity is connected.
2. The control device for preventing relay contact adhesion according to claim 1, wherein: the power supply unit (1) comprises an alternating current input end (2) and a voltage stabilizing unit (3), wherein the alternating current input end (2) is electrically connected with the controller (6) through a zero-crossing detection unit (9), and the controller (6), the zero-crossing detection unit (9), the relay unit (4), the communication unit (8) and the display unit (7) are electrically connected with the voltage stabilizing unit (3).
3. The control device for preventing relay contact adhesion according to claim 2, wherein: the voltage stabilizing unit (3) comprises a step-down transformer (12), a bridge rectifier circuit (13) and a three-terminal voltage stabilizer, wherein the alternating current input end (2) is electrically connected with the bridge rectifier circuit (13) through the step-down transformer (12), and the bridge rectifier circuit (13) is electrically connected with the three-terminal voltage stabilizer.
4. The control device for preventing relay contact adhesion according to claim 1, wherein: the zero-crossing detection unit (9) comprises a first voltage-dividing resistor (10) and a comparator (11), the power supply unit (1) is electrically connected with the comparator (11) through the first voltage-dividing resistor (10), and the comparator (11) is electrically connected with the controller (6).
5. The control device for preventing relay contact adhesion according to claim 1, wherein: the relay unit (4) comprises a driving triode (14) and a relay, the controller (6) is connected with the relay through the driving triode (14), the relay comprises a protection diode (16), a coil (15), a switching end (18) and a normally open contact (17), the normally open contact (17) is in contact connection with the switching end (18), the switching end (18) is connected with the coil (15) through electromagnetic induction, one end of the coil (15) is electrically connected with the driving triode (14), the other end of the coil (15) is electrically connected with the power supply unit (1), and two ends of the coil (15) are connected with the protection diode (16) in parallel.
6. The control device for preventing relay contact adhesion according to claim 1, wherein: the current sampling unit (5) comprises a sampling resistor (21), a second voltage-dividing resistor (19) and a sampling triode (20), the output end of the relay unit (4) is electrically connected with the sampling resistor (21), the sampling resistor (21) is electrically connected with the second voltage-dividing resistor (19), and the second voltage-dividing resistor (19) is electrically connected with the controller (6) through the sampling triode (20).
7. The control device for preventing relay contact adhesion according to claim 1, wherein: the communication unit (8) is any one of a nine-pin serial port, a 2G module, a 4G module or an NB module, and the display unit (7) is a liquid crystal display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321015892.3U CN219626553U (en) | 2023-04-28 | 2023-04-28 | Control device for preventing relay contact adhesion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321015892.3U CN219626553U (en) | 2023-04-28 | 2023-04-28 | Control device for preventing relay contact adhesion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219626553U true CN219626553U (en) | 2023-09-01 |
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ID=87796819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321015892.3U Active CN219626553U (en) | 2023-04-28 | 2023-04-28 | Control device for preventing relay contact adhesion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219626553U (en) |
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2023
- 2023-04-28 CN CN202321015892.3U patent/CN219626553U/en active Active
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