CN220963143U - Self-adaptive zero-crossing start-stop circuit of relay - Google Patents
Self-adaptive zero-crossing start-stop circuit of relay Download PDFInfo
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- CN220963143U CN220963143U CN202322702085.5U CN202322702085U CN220963143U CN 220963143 U CN220963143 U CN 220963143U CN 202322702085 U CN202322702085 U CN 202322702085U CN 220963143 U CN220963143 U CN 220963143U
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- 230000009286 beneficial effect Effects 0.000 abstract description 5
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Abstract
The application discloses a self-adaptive zero-crossing start and stop circuit of a relay, which comprises a zero-crossing control module, an MCU, a relay opening and closing control module and a zero-crossing opening and closing module; the MCU is provided with self-adaptive adjusting time; the zero-crossing control module outputs a zero-crossing signal to the MCU when the load circuit approaches zero, the MCU starts self-adaptive adjustment time countdown when receiving the zero-crossing signal, and outputs an opening and closing control signal after reaching the self-adaptive adjustment time; when receiving the opening and closing control signal, the contact switch of the relay is controlled to be closed or opened; the MCU detects a falling edge signal in the load circuit, and when the falling edge signal is not received, the MCU adjusts the self-adaptive adjustment time to enable the contact switch of the relay to be attracted or disconnected near the zero point of the load circuit. The application has the effect of providing a relay capable of controlling the opening and closing time of the relay, and is beneficial to further prolonging the service life of the relay.
Description
Technical Field
The application relates to the technical field of intelligent switches, in particular to a self-adaptive zero-crossing start-stop circuit of a relay.
Background
When the relay is used as a switching element, if the relay is opened or closed under the condition of high voltage, the problem that the on-off contact of the relay is oxidized and the contact is easy to adhere easily occurs, and the service life of the contactor is shortened.
In order to reduce the adhesion of contacts of an electric shock device and prolong the service life of a relay, a method for opening and closing when a circuit passes zero (the alternating current phase angle is 0 degree) is generally used by utilizing the characteristic that the voltage, the current and the direction of alternating current change periodically; however, when the relay is used for a long time, deviation between the opening and closing of the relay and the zero crossing point is easy to occur.
In order to solve the problems, an on-off circuit capable of controlling the opening and closing time of the relay is designed, so that the on-off circuit has important practical significance and application value.
Disclosure of utility model
In order to provide a relay capable of controlling the opening and closing time of the relay and further prolonging the service life of the relay, the application provides a self-adaptive zero-crossing start-stop circuit of the relay.
The application provides a self-adaptive zero-crossing start-stop circuit of a relay, which adopts the following technical scheme:
the relay self-adaptive zero-crossing start and stop circuit comprises a zero-crossing control module, an MCU, a relay opening and closing control module and a zero-crossing opening and closing module;
The zero-crossing control module is connected with the input end of the MCU, and the MCU is provided with self-adaptive adjustment time; the zero-crossing control module outputs a zero-crossing signal to the MCU when the load circuit approaches zero, the MCU starts self-adaptive adjustment time countdown when receiving the zero-crossing signal, and outputs an opening and closing control signal after reaching the self-adaptive adjustment time;
The relay opening and closing control module is connected with a relay; the relay opening and closing control module is connected with the output end of the MCU to control the contact switch of the relay to be closed or opened when the opening and closing control signal is received;
The zero opening and closing module is connected with the relay opening and closing control module, the zero opening and closing module is connected with the MCU, the zero opening and closing module is conducted when the contact switch of the relay is attracted, and the zero opening and closing module is cut off when the contact switch of the relay is disconnected;
The MCU is used for detecting a falling edge signal in the load circuit when the zero opening and closing module is turned on and off, and the MCU adjusts the self-adaptive adjusting time when the falling edge signal is not received so that a contact switch of the relay is attracted or disconnected near the zero point of the load circuit.
By adopting the technical scheme, when the load circuit approaches zero, the zero crossing control module outputs a zero crossing signal to the MCU, the MCU starts self-adaptive adjustment time countdown (namely, the MCU delays for a period of time), and outputs an opening and closing control signal to the relay opening and closing control module after the self-adaptive adjustment time is reached, so that the relay opening and closing control module is conducted; the relay opening control module controls the contact switch of the relay to be attracted to enable the zero opening and closing module to be conducted, or controls the contact switch of the relay to be disconnected to enable the zero opening and closing module to be cut off; when the zero opening and closing module is turned on and off, the MCU judges whether a falling edge signal exists in the load circuit or not, namely, the MCU judges whether a contact switch of the relay is attracted or disconnected near a zero crossing point of the load circuit or not:
There are two situations at this time: the first situation is that the MCU detects a falling edge signal, and then the contact switch of the relay is judged to be attracted or disconnected near the zero point of the load circuit; the second situation is that the MCU does not detect the falling edge signal, the contact switch of the relay is judged not to be attracted or disconnected near the zero point of the load circuit, and the MCU adjusts the self-adaptive adjustment time at the moment so as to effectively ensure that the contact switch of the relay is attracted or disconnected near the zero point of the circuit; the application further provides a self-adaptive zero-crossing start-stop circuit of the relay, namely the relay capable of controlling the opening and closing time of the relay, which is beneficial to further prolonging the service life of the relay.
Preferably, the zero crossing control module comprises a first triode, a base electrode of the first triode is coupled with a live wire in the alternating current circuit, an emitting electrode of the first triode is grounded, a collecting electrode of the first triode is coupled with a power supply, and a collecting electrode of the first triode is connected with an input end of the MCU.
By adopting the technical scheme, the first triode is an NPN triode, and receives a high level of a fire wire in the alternating current circuit when the load circuit is not close to the zero point, the first triode is conducted, and the input end of the MCU loses a zero crossing signal; when the load circuit approaches zero, the base electrode of the first triode is not conducted, the first triode is cut off, and at the moment, the input end of the MCU receives a high-level zero crossing signal.
Preferably, the relay opening and closing control module includes: and the base electrode of the second triode is coupled to the output end of the MCU, the emitting electrode of the second triode is grounded, and the collecting electrode of the second triode is coupled to the power supply after being connected in series with the coil of the relay.
Through adopting above-mentioned technical scheme, the second triode is NPN triode, when load circuit is close zero point, and MCU's input receives the zero crossing signal of high level, and MCU begins self-adaptation adjustment time countdown this moment, outputs the control signal that opens and shuts in order to control second triode and switch on after reaching self-adaptation adjustment time, and the coil of relay gets the electricity in order to control the contact switch actuation or the disconnection of relay.
Preferably, the contact switch of the relay is connected in series in the load circuit; the zero switching module comprises a third triode, the base electrode of the third triode is connected with the load circuit, the emitter electrode of the third triode is grounded, and the emitter electrode of the third triode is coupled with a power supply; and the MCU is connected with the emitter of the third triode.
By adopting the technical scheme, when the load circuit approaches to the zero point, the contact switch of the relay is attracted to control the load circuit to be turned on, or the contact switch of the relay is disconnected to control the load circuit to be turned off; at this time, the MCU detects whether the emitter of the third triode has a falling edge signal.
Preferably, the first triode is connected with a first voltage regulator; the positive pole of first voltage-stabilizing tube is connected with the projecting pole of first triode, the negative pole of first voltage-stabilizing tube with the base of first triode is connected.
By adopting the technical scheme, the first voltage stabilizing tube is in a reverse breakdown state and is used for stabilizing forward voltage between the base electrode and the emitter electrode of the first triode.
Preferably, the collector and the emitter of the first triode are connected in parallel with a first capacitor.
By adopting the technical scheme, the first capacitor provides a feedback loop in the working process of the first triode, so that the collector current of the first triode is stable in the working process.
Preferably, the coil of the relay is connected in anti-parallel with a second voltage stabilizing tube.
Through adopting above-mentioned technical scheme, in the relay control module that opens and shuts by the second triode control, the second steady voltage tube is in the coil of relay the switching on with the outage in the twinkling of an eye, the coil of relay can produce the overvoltage, and the second steady voltage tube releases the too high voltage this moment to the protection second triode is not damaged.
Preferably, the zero switching module is connected with a third voltage regulator, the positive electrode of the third voltage regulator is connected with the emitter of a third triode, the negative electrode of the third voltage regulator is connected with the base electrode of the third triode, and the collector and the emitter of the third triode are connected with a second capacitor in parallel.
By adopting the technical scheme, the third voltage stabilizing tube is in a reverse breakdown state and is used for stabilizing the forward voltage between the base electrode and the emitter electrode of the first triode; the second capacitor provides a feedback loop in the working process of the third triode, so that the collector current of the third triode is stable in the working process, and the circuit reliability is improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. When the load circuit approaches zero, the zero crossing control module outputs a zero crossing signal to the MCU, and the MCU outputs an opening and closing control signal to the relay opening and closing control module after reaching the self-adaptive adjusting time so as to enable the relay opening and closing control module to be conducted; the relay opening and closing control module controls the zero opening and closing module to be switched on or switched off; when the zero opening and closing module is turned on and off, the MCU judges whether a falling edge signal exists in the load circuit or not, namely, the MCU judges whether a contact switch of the relay is attracted or disconnected near a zero crossing point of the load circuit or not;
There are two situations at this time: the first situation is that the MCU detects a falling edge signal, and then the contact switch of the relay is judged to be attracted or disconnected near the zero point of the load circuit; the second situation is that the MCU does not detect the falling edge signal, the contact switch of the relay is judged not to be attracted or disconnected near the zero point of the load circuit, and the MCU adjusts the self-adaptive adjustment time at the moment so as to effectively ensure that the contact switch of the relay is attracted or disconnected near the zero point of the circuit; therefore, the application provides the relay which can control the opening and closing time of the relay, and is beneficial to further prolonging the service life of the relay;
2. When the load circuit approaches to the zero point, the contact switch of the relay is attracted to control the load circuit to be turned on, or the contact switch of the relay is disconnected to control the load circuit to be turned off; at this time, the MCU detects whether the emitter of the third triode has a falling edge signal or not;
3. The third voltage stabilizing tube is in a reverse breakdown state and is used for stabilizing forward voltage between the base electrode and the emitter electrode of the first triode; the second capacitor provides a feedback loop in the working process of the third triode, so that the collector current of the third triode is stable in the working process, and the circuit reliability is improved.
Drawings
Fig. 1 is a circuit diagram of a relay adaptive zero-crossing start-stop circuit according to an embodiment of the present application.
Reference numerals illustrate:
1. a zero crossing control module; 2. the relay opening and closing control module; 3. and the zero point opening and closing module.
Detailed Description
The present application will be described in further detail with reference to fig. 1.
The embodiment of the application discloses a self-adaptive zero-crossing start-stop circuit of a relay. Referring to fig. 1, the relay self-adaptive zero-crossing start and stop circuit comprises a zero-crossing control module 1, an MCU (not shown in the figure), a relay opening and closing control module 2 and a zero-crossing opening and closing module 3; the zero-crossing control module 1 is connected with the input end of the MCU, and the MCU is provided with self-adaptive adjustment time; the zero-crossing control module 1 outputs a zero-crossing signal to the MCU when the load circuit approaches zero, and the MCU starts self-adaptive adjustment time countdown when receiving the zero-crossing signal and outputs an opening and closing control signal after reaching the self-adaptive adjustment time.
Referring to fig. 1, a relay K1 is connected to a relay opening and closing control module 2; the relay opening and closing control module 2 is connected with the output end of the MCU to control the contact switch K1-1 of the relay K1 to be closed or opened when receiving an opening and closing control signal; the zero opening and closing module 3 is connected with the relay opening and closing control module 2, the zero opening and closing module 3 is connected with the MCU, the zero opening and closing module 3 is conducted when the contact switch K1-1 of the relay K1 is sucked, and the zero opening and closing module 3 is cut off when the contact switch K1-1 of the relay K1 is disconnected; the MCU is used for detecting a falling edge signal in the load circuit when the zero opening and closing module 3 is turned on and off, and the MCU adjusts the self-adaptive adjustment time when the falling edge signal is not received so as to enable the contact switch K1-1 of the relay K1 to be attracted or disconnected near the zero point of the load circuit.
Specifically, the relay opening and closing control module 2 controls the contact switch K1-1 of the relay K1 to be attracted to enable the zero opening and closing module 3 to be conducted, or the relay K1 opening control module controls the contact switch K1-1 of the relay K1 to be disconnected to enable the zero opening and closing module 3 to be cut off; when the zero opening and closing module 3 is turned on and off, the MCU judges whether a falling edge signal exists in the load circuit or not, namely, the MCU judges whether a contact switch K1-1 of a relay K1 is attracted or disconnected near a zero crossing point of the load circuit or not; when the MCU detects the falling edge signal, the contact switch K1-1 of the relay K1 is judged to be attracted or disconnected near the zero point of the load circuit; when the MCU does not detect the falling edge signal, the contact switch K1-1 of the relay K1 is judged not to be attracted or disconnected near the zero point of the load circuit, and at the moment, the MCU adjusts the self-adaptive adjustment time to effectively ensure that the contact switch K1-1 of the relay K1 is attracted or disconnected near the zero point of the circuit.
Referring to fig. 1, taking the circuit shown in fig. 1 as an example, the ZERO pin, the RELAY and the zero_relay in the figure are respectively connected with the MCU. The zero-crossing control module 1 comprises a first triode Q1, wherein the first triode Q1 is an NPN triode, a base electrode of the first triode Q1 is coupled with a live wire L in an alternating current circuit, an emitting electrode of the first triode Q1 is grounded, a collector electrode of the first triode Q1 is coupled with a 3.3V power supply, and the collector electrode of the first triode Q1 is connected with an input end of the MCU; when the load circuit is not close to the zero point, the first triode Q1 receives the high level of the live wire L in the alternating current circuit, the first triode Q1 is conducted, and the input end of the MCU loses the zero crossing signal; when the load circuit approaches zero, the base electrode of the first triode Q1 is not conducted, the first triode Q1 is cut off, and at the moment, the input end of the MCU receives a high-level zero crossing signal.
Referring to fig. 1, a first transistor Q1 is connected to a first voltage regulator D1, where the first voltage regulator D1 is in a reverse breakdown state, and the first voltage regulator D1 is configured to stabilize a forward voltage between a base and an emitter of the first transistor Q1; the positive electrode of the first voltage stabilizing tube D1 is connected with the emitter of the first triode Q1, and the negative electrode of the first voltage stabilizing tube D1 is connected with the base electrode of the first triode Q1; the collector and the emitter of the first triode Q1 are connected in parallel with a first capacitor C1; the first capacitor C1 provides a feedback loop during the operation of the first transistor Q1, so that the collector current of the first transistor Q1 is relatively stable during the operation.
Referring to fig. 1, taking the circuit shown in fig. 1 as an example, the relay opening and closing control module 2 includes a second triode Q2, where the second triode Q2 is an NPN triode; the base electrode of the second triode Q2 is coupled to the output end of the MCU, the emitter electrode of the second triode Q2 is grounded, and the collector electrode of the second triode Q2 is coupled to a 5V power supply after being connected in series with the coil of the relay K1; in the relay opening and closing control module 2 controlled by the second triode Q2, the second voltage stabilizing tube D2 generates overvoltage at the moment of powering on and powering off the coil of the relay K1, and at this moment, the second voltage stabilizing tube D2 discharges the excessive voltage in the live wire L of the load circuit to protect the second triode Q2 from being damaged.
Referring to fig. 1, taking the circuit shown in fig. 1 as an example, a contact switch K1-1 of a relay K1 is connected in series in a load circuit; the zero switching module 3 comprises a third triode Q3, and the third triode Q3 is an NPN triode; the base electrode of the third triode Q3 is connected with a load circuit, the emitter electrode of the third triode Q3 is grounded, and the emitter electrode of the third triode Q3 is coupled with a 3.3V power supply; the MCU is connected with the emitter of the third triode Q3; when the load circuit approaches to zero, the contact switch K1-1 of the relay K1 is attracted to control the load circuit to be turned on, or the contact switch K1-1 of the relay K1 is disconnected to control the load circuit to be turned off; at this time, the MCU detects whether the emitter of the third transistor Q3 has a falling edge signal.
Referring to fig. 1, taking the circuit shown in fig. 1 as an example, the zero switching module 3 is connected with a third voltage stabilizing tube D3, the positive electrode of the third voltage stabilizing tube D3 is connected with the emitter of a third triode Q3, the negative electrode of the third voltage stabilizing tube D3 is connected with the base of the third triode Q3, and the collector and the emitter of the third triode Q3 are connected in parallel with a second capacitor C2; the third voltage stabilizing tube D3 is in a reverse breakdown state, and the third voltage stabilizing tube D3 is used for stabilizing forward voltage between the base electrode and the emitter electrode of the first triode Q1; the second capacitor C2 provides a feedback loop in the working process of the third triode Q3, so that the collector current of the third triode Q3 is relatively stable in the working process, and the circuit reliability is improved.
The implementation principle of the self-adaptive zero-crossing start-stop circuit of the relay provided by the embodiment of the application is as follows: when the load circuit approaches zero, the first triode Q1 is cut off, at the moment, the MCU starts self-adaptive adjustment time counting down when receiving a high-level zero crossing signal, after the self-adaptive adjustment time is reached, the MCU outputs an opening and closing control signal to control the second triode Q2 to be conducted, at the moment, the contact switch K1-1 of the relay K1 is closed or opened, and at the same time, the MCU detects whether a falling edge signal exists in the load circuit.
There are two situations at this time: the first situation is that the MCU detects a falling edge signal, and then the contact switch K1-1 of the relay K1 is judged to be attracted or disconnected near the zero point of the load circuit; the second situation is that the MCU does not detect a falling edge signal, and then the contact switch K1-1 of the relay K1 is judged not to be attracted or disconnected near a zero point of a load circuit, and at the moment, the MCU adjusts the self-adaptive adjustment time so as to effectively ensure that the contact switch K1-1 of the relay K1 is attracted or disconnected near the zero point of the circuit; therefore, the application provides the relay K1 capable of controlling the opening and closing time of the relay K1, which is beneficial to further prolonging the service life of the relay K1.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (8)
1. The self-adaptive zero-crossing start and stop circuit of the relay is characterized by comprising a zero-crossing control module (1), an MCU, a relay opening and closing control module (2) and a zero-crossing opening and closing module (3);
the zero-crossing control module (1) is connected with the input end of the MCU, and the MCU is provided with self-adaptive adjustment time; the zero-crossing control module (1) outputs a zero-crossing signal to the MCU when the load circuit approaches zero, and the MCU starts the self-adaptive adjustment time countdown when receiving the zero-crossing signal and outputs an opening and closing control signal after reaching the self-adaptive adjustment time;
The relay opening and closing control module (2) is connected with a relay; the relay opening and closing control module (2) is connected with the output end of the MCU to control the contact switch of the relay to be attracted or disconnected when the opening and closing control signal is received;
The zero opening and closing module (3) is connected with the relay opening and closing control module (2), the zero opening and closing module (3) is connected with the MCU, the zero opening and closing module (3) is conducted when the contact switch of the relay is sucked, and the zero opening and closing module (3) is cut off when the contact switch of the relay is disconnected;
The MCU is used for detecting a falling edge signal in the load circuit when the zero opening and closing module (3) is turned on and turned off, and the MCU adjusts the self-adaptive adjusting time when the falling edge signal is not received so that a contact switch of the relay is attracted or disconnected near the zero point of the load circuit.
2. The relay self-adaptive zero-crossing start-stop circuit according to claim 1, wherein the zero-crossing control module (1) comprises a first triode, a base electrode of the first triode is coupled with a live wire in an alternating current circuit, an emitting electrode of the first triode is grounded, a collector electrode of the first triode is coupled with a power supply, and a collector electrode of the first triode is connected with an input end of the MCU.
3. The relay adaptive zero-crossing start-stop circuit according to claim 1, wherein the relay opening-closing control module (2) comprises: and the base electrode of the second triode is coupled to the output end of the MCU, the emitting electrode of the second triode is grounded, and the collecting electrode of the second triode is coupled to the power supply after being connected in series with the coil of the relay.
4. The relay adaptive zero-crossing switching circuit of claim 1, wherein the contact switch of the relay is connected in series in a load circuit; the zero switching module (3) comprises a third triode, the base electrode of the third triode is connected with the load circuit, the emitter electrode of the third triode is grounded, and the emitter electrode of the third triode is coupled with a power supply; and the MCU is connected with the emitter of the third triode.
5. The relay self-adaptive zero-crossing start-stop circuit according to claim 2, wherein the first triode is connected with a first voltage regulator; the positive pole of first voltage-stabilizing tube is connected with the projecting pole of first triode, the negative pole of first voltage-stabilizing tube with the base of first triode is connected.
6. The relay adaptive zero crossing switching circuit of claim 5, wherein the collector and emitter of the first transistor are connected in parallel with a first capacitor.
7. A relay self-adaptive zero-crossing start-stop circuit according to claim 3, wherein the coil of the relay is antiparallel connected with a second voltage stabilizing tube.
8. The relay self-adaptive zero-crossing start-stop circuit according to claim 4, wherein the zero-point opening-closing module (3) is connected with a third voltage regulator tube, the positive electrode of the third voltage regulator tube is connected with the emitter electrode of a third triode, the negative electrode of the third voltage regulator tube is connected with the base electrode of the third triode, and the collector electrode and the emitter electrode of the third triode are connected with a second capacitor in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322702085.5U CN220963143U (en) | 2023-10-07 | 2023-10-07 | Self-adaptive zero-crossing start-stop circuit of relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322702085.5U CN220963143U (en) | 2023-10-07 | 2023-10-07 | Self-adaptive zero-crossing start-stop circuit of relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220963143U true CN220963143U (en) | 2024-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322702085.5U Active CN220963143U (en) | 2023-10-07 | 2023-10-07 | Self-adaptive zero-crossing start-stop circuit of relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220963143U (en) |
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2023
- 2023-10-07 CN CN202322702085.5U patent/CN220963143U/en active Active
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