CN216749740U - Relay circuit and relay equipment - Google Patents
Relay circuit and relay equipment Download PDFInfo
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- CN216749740U CN216749740U CN202123233169.6U CN202123233169U CN216749740U CN 216749740 U CN216749740 U CN 216749740U CN 202123233169 U CN202123233169 U CN 202123233169U CN 216749740 U CN216749740 U CN 216749740U
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Abstract
The utility model relates to a relay circuit and relay equipment, zero cross detection circuit among this relay circuit detects alternating current power supply's zero cross signal, and will zero cross signal conveys to the controller, and the controller is according to this zero cross signal determination drive circuit's drive signal, so that drive circuit switches the operating condition of this relay at zero point moment, control relay moves at alternating current power supply's zero point moment, and then reduces the electric arc that produces because the relay moves, reduce the loss of relay contact, prolong the relay life-span, and simultaneously, for traditional relay circuit, this relay circuit only needs zero cross detection circuit all the way, circuit structure is simple, and circuit cost is reduced.
Description
Technical Field
The utility model relates to a relay field especially relates to a relay circuit and relay equipment.
Background
The relay is used as a switching device, and the application range is wide. Typically, the full load life is less than 3 ten thousand to 5 ten thousand. When the relay drives various different loads, in the instant of relay contact actuation or disconnection, a large voltage difference can be generated between the contacts of the relay, the voltage difference can cause the generation of electric arcs, the loss of the contacts is large, the service life of the relay is further influenced, and even safety accidents can be caused.
At present, in order to reduce generated electric arcs, a traditional relay circuit can drive a relay to act at the zero point moment of an alternating-current power supply so as to reduce contact loss, but the number of the arranged zero-crossing detection circuits is large, the circuit structure is complex, and the circuit cost is high.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model aims at providing a relay circuit and relay equipment, it can reduce relay contact loss, extension relay life-span to simplify circuit structure, reduce circuit cost.
In order to solve the above technical problem, an embodiment of the present invention provides the following technical solution:
in a first aspect, embodiments of the present invention provide a relay circuit,
the relay circuit includes: the device comprises a relay, a driving circuit, a zero-crossing detection circuit and a controller;
the first contact of the relay is electrically connected with a zero line of an alternating current power supply, the second contact of the relay is electrically connected with a live line of the alternating current power supply through a load, one end of the relay coil is electrically connected with a first direct current power supply, and the other end of the relay coil is electrically connected with one end of the driving circuit;
the other end of the driving circuit is electrically connected with the first end of the controller, and the driving circuit is used for driving the relay;
one end of the zero-crossing detection circuit is electrically connected with the second contact of the relay, the other end of the zero-crossing detection circuit is electrically connected with the second end of the controller, and the zero-crossing detection circuit is used for detecting a zero-crossing signal of the alternating current power supply; and the number of the first and second groups,
the controller is used for determining a driving signal of the relay according to the zero-crossing signal so as to enable the driving circuit to switch the working state of the relay at the zero-point moment.
In some embodiments, the driving circuit includes a first current limiting module and a switching module;
a first end of the first current limiting module is electrically connected with a second end of the controller, the second end of the first current limiting module is grounded, a third end of the first current limiting module is electrically connected with one end of the switch module, and the first current limiting module is used for limiting the current of the driving signal;
the other end of the switch module is electrically connected with the coil of the relay, and the switch module is used for controlling the working state of the relay.
In some embodiments, the first current limiting module comprises a first resistor and a second resistor, and the switching module comprises a first transistor;
one end of the first resistor is connected with the first end of the controller, the other end of the first resistor is respectively connected with the base electrode of the first triode and one end of the second resistor, and the other end of the second resistor is grounded;
and the collector of the first triode is connected with the coil of the relay, and the emitter of the first triode is grounded.
In some embodiments, the zero crossing detection circuit includes a second current limiting module and a clamping module;
one end of the second current limiting module is electrically connected with the second contact of the relay, the other end of the second current limiting module is electrically connected with the clamping module and the second end of the controller respectively, the second current limiting module is used for limiting the current of the zero-crossing detection signal, and the clamping module is used for clamping the zero-crossing detection signal to clamping voltage.
In some embodiments, the clamping module comprises a first clamping submodule and a second clamping submodule;
one end of the first clamping submodule is electrically connected with a second direct-current power supply, and the other end of the first clamping submodule is electrically connected with one end of the second clamping submodule and the second end of the controller respectively and used for clamping the zero-crossing detection signal to positive clamping voltage;
the other end of the second clamping submodule is grounded and is used for clamping the zero-crossing detection signal to negative clamping voltage.
In some embodiments, the second current limiting module includes a third resistor and a fourth resistor, one end of the third resistor is connected to the second contact of the relay, the other end of the third resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is electrically connected to the clamping module and the second end of the controller, respectively.
In some embodiments, the first clamping sub-module includes a first diode, the second clamping sub-module includes a second diode, a cathode of the first diode is connected to the second dc power source, an anode of the first diode is connected to a cathode of the second diode and the second terminal of the controller, respectively, and an anode of the second diode is grounded.
In some embodiments, the zero crossing detection circuit further comprises a filtering module;
the filtering module is electrically connected with the second current limiting module, the clamping module and the second end of the controller respectively, and the filtering module is used for filtering the zero-crossing detection signal.
In some embodiments, the filtering module includes a capacitor, one end of the capacitor is connected to the second current limiting module, the clamping module, and the second end of the controller, and the other end of the capacitor is grounded.
In a second aspect, embodiments of the present invention provide a relay device including a relay circuit as described above.
The utility model discloses in each embodiment, this relay circuit includes relay, drive circuit, zero cross detection circuit and controller, wherein, the first contact of relay and alternating current power supply's zero line electric connection, the second contact of relay through load and alternating current power supply's live wire electric connection, relay coil's one end and first direct current power supply electric connection, relay coil's the other end with drive circuit's one end electric connection, drive circuit's the other end and the first end electric connection of controller, zero cross detection circuit's one end and the second contact electric connection of relay, the other end of zero cross detection circuit and the second end electric connection of controller. Therefore, the zero-crossing detection circuit detects the zero-crossing signal of the alternating current power supply and transmits the zero-crossing signal to the controller, the controller determines the driving signal of the driving circuit according to the zero-crossing signal so that the driving circuit switches the working state of the relay at the zero time and controls the relay to act at the zero time of the alternating current power supply, thereby reducing electric arcs generated by the action of the relay, reducing the loss of relay contacts and prolonging the service life of the relay.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of one of the relay circuits provided in the embodiments of the present invention;
fig. 2 is a schematic structural diagram of one of the relay circuits provided in the embodiment of the present invention;
fig. 3 is a schematic circuit diagram of one of the relay circuits provided in the embodiments of the present invention;
fig. 4 is a schematic diagram of one of the normal zero-cross detection signals and the zero-cross detection signal when the relay is closed according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a relay circuit according to an embodiment of the present invention. As shown in fig. 1, the relay circuit 100 includes a relay 10, a drive circuit 20, a zero-cross detection circuit 30, and a controller 40. The first contact of the relay 10 is electrically connected to the zero line of the ac power supply 200, the second contact of the relay 10 is electrically connected to the live line of the ac power supply 200 through the load 300, one end of the coil of the relay 10 is electrically connected to the first dc power supply 400, the other end of the coil of the relay 10 is electrically connected to one end of the driving circuit 20, the other end of the driving circuit 20 is electrically connected to the first end of the controller 40, one end of the zero-crossing detection circuit 30 is electrically connected to the second contact of the relay 10, and the other end of the zero-crossing detection circuit 30 is electrically connected to the second end of the controller 40.
When the driving circuit 20 drives the relay 10 with a high-level driving signal, the coil of the relay 10 is energized, the relay 10 is closed, the first contact of the relay 10 is connected with the second contact, the zero-crossing detection circuit 30 is electrically connected with the zero line of the alternating current power supply 200 through the second contact and the first contact, and the contact resistance is small, generally dozens of milliohms and negligible, therefore, the zero-crossing detection circuit 30 is directly connected to the zero line of the alternating current power supply 200, detects a low-level detection signal, transmits the low-level detection signal to the second end of the controller 40, and receives and processes the low-level detection signal by the controller 40;
when the driving circuit 20 drives the relay 10 with a low-level driving signal, the coil of the relay 10 is not energized, the relay 10 is disconnected, the first contact and the second contact of the relay 10 are disconnected, the zero-crossing detection circuit 30 is connected with the live wire of the alternating current power supply 200 through the load 300, and because the resistance of the load 300 is much smaller than the circuit impedance of the zero-crossing detection circuit 30, the zero-crossing detection circuit is equivalently directly connected to the live wire of the alternating current power supply 200, detects a high-level detection signal, transmits the high-level detection signal to the second end of the controller 40, and receives and processes the high-level detection signal by the controller 40;
the high level detection signal and the low level detection signal are both transmitted to the controller 40 as zero-crossing detection signals, after a period of driving, the controller 40 may receive several periods of zero-crossing detection signals, and the controller 40 determines the zero-point time of the ac power supply 200 and determines the driving signal of the driving circuit 20 according to the received zero-crossing detection signals, so that the driving circuit 20 switches the operating state of the relay 10 at the zero-point time, i.e., closes or opens the relay.
After the controller 40 detects the zero-crossing time of the ac power supply 200, it automatically adjusts the delay time, and outputs the driving signal after the delay time, so as to really close or open the relay 10 at the zero-crossing time, and reduce the arc generated due to the voltage difference between the two ends of the contact.
Therefore, the zero-crossing detection circuit in the relay circuit detects the zero-crossing detection signal of the alternating current power supply and transmits the zero-crossing detection signal to the controller, the controller determines the driving signal of the driving circuit according to the zero-crossing detection signal so that the driving circuit switches the working state of the relay at the zero time and controls the relay to act at the zero time of the alternating current power supply, thereby reducing electric arcs generated by the action of the relay, reducing the loss of relay contacts and prolonging the service life of the relay.
The ac power source 200 may be any form of ac signal, such as 220V mains. In addition, the zero-cross detection circuit 30 in the relay circuit 100 can also be applied to any circuit requiring soft switching, so that the soft switching technology is realized, the arc caused by the switching action is reduced, and the service life of the switch is further prolonged.
In some embodiments, the controller 40 may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a single chip, an ARM (Acorn RISC machine) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components. Also, the controller 40 may be any conventional processor, controller, microcontroller, or state machine. Controller 40 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP, and/or any other such configuration. The controller 40 may also be a frequency conversion board or a main control board of the washing machine.
Please refer to fig. 2, fig. 2 is a schematic structural diagram of a relay circuit provided in the present invention, as shown in fig. 2, the driving circuit 20 includes a first current limiting module 21 and a switch module 22, wherein a first end of the first current limiting module 21 is electrically connected to a second end of the controller 40, the second end of the first current limiting module 21 is grounded, a third end of the first current limiting module 21 is electrically connected to one end of the switch module 22, and the other end of the switch module 22 is electrically connected to the coil of the relay 10.
The first current limiting module 21 is used for limiting the driving current to protect the switch module 22 from being damaged by a large current. The working state of the switch module 22 controls the on-off of the coil of the relay 10, when the switch module 22 is in the on-state, the coil of the relay 10 is powered on, and when the switch module 22 is in the off-state, the coil of the relay 10 is powered off.
The switch module 22 may be in any form, such as a transistor, a MOS transistor, a contactor, an electronic switch, etc., or may be in a combination of a plurality of switches.
In some embodiments, the zero crossing detection circuit 30 includes a second current limiting module 31 and a clamping module 32, wherein one end of the second current limiting module 31 is electrically connected to the second contact of the relay 10, and the other end of the second current limiting module 31 is electrically connected to the clamping module 32 and the second end of the controller 40, respectively.
The second current limiting module 31 is configured to limit the current of the zero-crossing detection signal, so as to prevent the controller 40 from being damaged due to an excessively large current of the zero-crossing detection signal. The clamping module 32 is configured to clamp the zero-cross detection signal to a clamping voltage, so as to further protect a pin of the controller 40 from being damaged by a large current.
In some embodiments, the clamping module 32 includes a first clamping submodule 321 and a second clamping submodule 322, one end of the first clamping submodule 321 is electrically connected to the second dc power supply 500, the other end of the first clamping submodule 321 is electrically connected to one end of the second clamping submodule 322 and the second end of the controller 40, and the other end of the second clamping submodule 322 is grounded.
When the voltage of the zero-crossing detection signal is greater than the voltage of the second dc power supply 500, the first clamping submodule 321 clamps the zero-crossing detection signal to a positive clamping voltage, the voltage received by the second end of the controller 40 is the positive clamping voltage, when the voltage of the zero-crossing detection signal is less than zero, the second clamping submodule 322 clamps the zero-crossing detection signal to a negative clamping voltage, the voltage received by the second end of the controller 40 is the negative clamping voltage, and when the voltage of the zero-crossing detection signal is greater than zero and less than the voltage of the second dc power supply 500, the voltage received by the second end of the controller 40 is the voltage of the zero-crossing detection signal.
In some embodiments, the zero crossing detection circuit 30 further includes a filtering module 33, the filtering module 33 is electrically connected to the second current limiting module 31, the clamping module 32 and the second end of the controller 40, respectively, and the filtering module 33 is configured to filter the zero crossing detection signal.
The filtering module 33 filters the zero-crossing signal to filter out clutter, so that the controller 40 can process the zero-crossing signal more accurately.
Referring to fig. 3, fig. 3 is a schematic circuit structure diagram of a relay circuit according to an embodiment of the present invention, as shown in fig. 3, an AC power supply 200 is connected to an AC-DC power supply module through a first interface CN1, and after conversion of the AC-DC power supply module, a first DC power supply VDD and a second DC power supply VCC are obtained to supply power to a subsequent circuit. The live wire of the ac power supply 200 is connected to pin 1 of the first interface CN1, and the neutral wire of the ac power supply 200 is connected to pin 3 of the first interface CN1, i.e., the output ground. In the present embodiment, the relay is TR 1.
The load 300 is a resistor RLoad, which is connected to the ac power supply 200 through the second interface CN2, one end of the resistor RLoad is connected to the live wire of the ac power supply 200 through pin 1 of the second interface CN2, and the other end of the resistor RLoad is connected to the second contact of the relay TR1 and the zero-crossing detection circuit 30 through pin 2 of the second interface CN 2.
A first contact of the relay TR1 is connected with a zero line of the alternating current power supply 200, a second contact of the relay TR1 is connected with the pin 2 of the second interface CN2 and the zero-crossing detection circuit 30, one end of a coil of the relay TR1 is connected with the first direct current power supply VDD, and the other end of the coil of the relay TR1 is connected with the driving circuit 20.
In this embodiment, the controller 40 is a controller chip MCU, and has a first end thereof being an IO1 pin and a second end thereof being an IO2 pin.
First current-limiting module 21 includes first resistance R1 and second resistance R2, switch module 22 includes first triode Q1, first resistance R1's one end with controller chip MCU's first end is connected, promptly with controller chip MCU's IO1 pin, first resistance R1's the other end respectively with first triode Q1's base with second resistance R2's one end is connected, second resistance R2's other end ground connection, first triode Q1's collecting electrode with relay TR 1's coil connection, first triode Q1's emitter ground connection.
The second current limiting module 31 includes a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is connected to the second contact of the relay TR1, the other end of the third resistor R3 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is electrically connected to the clamp module 32 and the second end of the controller chip MCU, i.e., is connected to the IO2 pin of the controller chip MCU.
The first clamping submodule 321 comprises a first diode D1, the second clamping submodule 322 comprises a second diode D2, a cathode of the first diode D1 is connected with the second direct-current power supply VCC, an anode of the first diode D1 is respectively connected with a cathode of the second diode D2 and a second end of the controller chip MCU, namely, is connected with an IO2 pin of the controller chip MCU, and an anode of the second diode D2 is grounded.
The filtering module 33 includes a capacitor C1, one end of the capacitor C1 is connected to the fourth resistor R4, the anode of the first diode D1, the cathode of the second diode D2, and the IO2 pin of the controller chip MCU, and the other end of the capacitor C1 is grounded.
The actuation and the disconnection of relay TR1 are in the twinkling of an eye all can produce the heavy current, and then produce big electric arc, and especially relay TR1 actuation is in the twinkling of an eye, and it is great to produce electric arc, therefore to take control relay TR1 actuation as an example, this relay circuit 100's working process can be described as follows:
the controller chip MCU outputs a driving signal through an IO1 pin, when a high-level driving signal is output, the first triode Q1 is conducted, the coil of the relay TR1 is electrified, the relay TR1 is closed, the first contact of the relay TR1 is connected with the second contact, the third resistor R3 is electrically connected with the zero line of the alternating-current power supply 200 through the second contact and the first contact, a low-level detection signal is detected, the low-level detection signal is transmitted to the IO2 pin of the controller chip MCU, and the low-level detection signal is received and processed by the controller chip MCU;
when the controller chip MCU outputs a low-level driving signal through an IO1 pin, the first triode Q1 is cut off, the coil of the relay TR1 is not electrified, the relay TR1 is disconnected, the first contact and the second contact of the relay TR1 are disconnected, the third resistor R3 is connected with a live wire of the alternating current power supply 200 through the load 300, the zero-crossing point detection circuit detects a high-level detection signal, the high-level detection signal is transmitted to the IO2 pin of the controller chip MCU, and the high-level detection signal is received and processed by the controller chip MCU.
The high-level detection signal and the low-level detection signal are both transmitted to the controller chip MCU as zero-crossing detection signals, after a period of driving, the controller chip MCU can receive several periods of the zero-crossing detection signals, and the controller chip MCU determines the zero-point time of the ac power supply 200 according to the received zero-crossing detection signals and determines the driving signal of the driving circuit 20, so that the driving circuit 20 switches the operating state of the relay TR1 at the zero-point time, i.e., turns on or off the relay TR 1.
Referring to fig. 4 together, fig. 4 is a schematic diagram of a normal zero-crossing detection signal and a zero-crossing detection signal when the relay TR1 is closed according to an embodiment of the present invention, as shown in fig. 4, a zero-crossing detection signal obtained by an IO2 pin of a controller chip MCU is a square wave signal of 50HZ, the normal zero-crossing detection signal is shown as an a curve, and zero-crossing detection signals before and after the relay TR1 is shown as a B curve, where t0 is a previous falling edge time detected by the zero-crossing detection circuit 30 before a high-level driving signal is sent, t1 is a previous rising edge time detected by the zero-crossing detection circuit 30 before a contact is actually closed after a high-level driving signal is sent, t2 is a time when a contact of the relay TR1 is actually closed, tkw is a high-level width of the normal zero-crossing signal, and tk0 is a high-level width of a first zero-crossing signal before the contact is actually closed, and t is the delay time.
That is, when the relay TR1 needs to be closed, the controller chip MCU starts to automatically delay for t milliseconds when detecting the zero-crossing falling edge of the ac power supply 200, and then outputs a high-level driving signal to the relay TR1 through the first pin I O1, so that the contacts of the relay TR1 are actually closed at the next zero-crossing falling edge. In addition, the controller chip MCU can automatically adjust the delay time, and through adjusting the delay time t, the tk1 is only slightly smaller than tkw, after several closing processes, the real closing time of the contact of the relay TR1 can be ensured to be the zero-crossing time of the alternating current power supply 200, so that the voltage between the contacts is lowest, and the generated arc is minimum.
To sum up, the zero-crossing detection circuit in the relay circuit detects the zero-crossing detection signal of the alternating current power supply and transmits the zero-crossing detection signal to the controller, the controller determines the driving signal of the driving circuit according to the zero-crossing detection signal so that the driving circuit switches the working state of the relay at the zero time and controls the action of the relay at the zero time of the alternating current power supply, thereby reducing the electric arc generated by the action of the relay, reducing the loss of the relay contact and prolonging the service life of the relay.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A relay circuit, comprising: the device comprises a relay, a driving circuit, a zero-crossing detection circuit and a controller;
the first contact of the relay is electrically connected with a zero line of an alternating current power supply, the second contact of the relay is electrically connected with a live line of the alternating current power supply through a load, one end of a coil of the relay is electrically connected with a first direct current power supply, and the other end of the coil of the relay is electrically connected with one end of the driving circuit;
the other end of the driving circuit is electrically connected with the first end of the controller, and the driving circuit is used for driving the relay;
one end of the zero-crossing detection circuit is electrically connected with the second contact of the relay, the other end of the zero-crossing detection circuit is electrically connected with the second end of the controller, and the zero-crossing detection circuit is used for detecting a zero-crossing detection signal of the alternating current power supply; and the number of the first and second groups,
the controller is used for determining a driving signal of the relay according to the zero-crossing detection signal so as to enable the driving circuit to switch the working state of the relay at the zero-point moment.
2. The relay circuit of claim 1, wherein the drive circuit comprises a first current limiting module and a switching module;
a first end of the first current limiting module is electrically connected with a second end of the controller, the second end of the first current limiting module is grounded, a third end of the first current limiting module is electrically connected with one end of the switch module, and the first current limiting module is used for limiting the current of the driving signal;
the other end of the switch module is electrically connected with the coil of the relay, and the switch module is used for controlling the working state of the relay.
3. The relay circuit of claim 2, wherein the first current limiting module comprises a first resistor and a second resistor, and the switching module comprises a first transistor;
one end of the first resistor is connected with the first end of the controller, the other end of the first resistor is respectively connected with the base electrode of the first triode and one end of the second resistor, and the other end of the second resistor is grounded;
and the collector of the first triode is connected with the coil of the relay, and the emitter of the first triode is grounded.
4. The relay circuit of claim 1, wherein the zero crossing detection circuit comprises a second current limiting module and a clamping module;
one end of the second current limiting module is electrically connected with the second contact of the relay, the other end of the second current limiting module is electrically connected with the clamping module and the second end of the controller respectively, the second current limiting module is used for limiting the current of the zero-crossing detection signal, and the clamping module is used for clamping the zero-crossing detection signal to clamping voltage.
5. The relay circuit of claim 4, wherein the clamping module comprises a first clamping submodule and a second clamping submodule;
one end of the first clamping submodule is electrically connected with a second direct-current power supply, and the other end of the first clamping submodule is electrically connected with one end of the second clamping submodule and the second end of the controller respectively and used for clamping the zero-crossing detection signal to positive clamping voltage;
the other end of the second clamping submodule is grounded and is used for clamping the zero-crossing detection signal to negative clamping voltage.
6. The relay circuit according to claim 4, wherein the second current limiting module comprises a third resistor and a fourth resistor, one end of the third resistor is connected to the second contact of the relay, the other end of the third resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is electrically connected to the second ends of the clamping module and the controller, respectively.
7. The relay circuit according to claim 5, wherein the first clamping submodule includes a first diode, the second clamping submodule includes a second diode, a cathode of the first diode is connected to the second DC power supply, an anode of the first diode is connected to a cathode of the second diode and the second terminal of the controller, respectively, and an anode of the second diode is grounded.
8. The relay circuit according to any of claims 4-7, wherein the zero crossing detection circuit further comprises a filtering module;
the filtering module is electrically connected with the second current limiting module, the clamping module and the second end of the controller respectively, and the filtering module is used for filtering the zero-crossing detection signal.
9. The relay circuit according to claim 8, wherein the filter module comprises a capacitor having one end connected to the second current limiting module, the clamp module, and the second end of the controller, respectively, and the other end connected to ground.
10. A relay arrangement, characterized in that it comprises a relay circuit according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123233169.6U CN216749740U (en) | 2021-12-21 | 2021-12-21 | Relay circuit and relay equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123233169.6U CN216749740U (en) | 2021-12-21 | 2021-12-21 | Relay circuit and relay equipment |
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| CN216749740U true CN216749740U (en) | 2022-06-14 |
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| CN202123233169.6U Active CN216749740U (en) | 2021-12-21 | 2021-12-21 | Relay circuit and relay equipment |
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