CN214898258U - Relay zero-crossing control circuit - Google Patents
Relay zero-crossing control circuit Download PDFInfo
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- CN214898258U CN214898258U CN202120974126.4U CN202120974126U CN214898258U CN 214898258 U CN214898258 U CN 214898258U CN 202120974126 U CN202120974126 U CN 202120974126U CN 214898258 U CN214898258 U CN 214898258U
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Abstract
The utility model relates to a relay zero passage control circuit, include: the power supply control circuit comprises a power supply zero-crossing detection circuit, a driving circuit, a pre-level circuit and a control unit; the detection end of the power supply zero-crossing detection circuit is connected with the power supply input end, the output end of the power supply zero-crossing detection circuit is connected with the first zero-crossing detection end of the control unit, the drive end of the control unit is connected with the input end of the drive circuit, the first output end of the drive circuit is connected with the first end of the pre-level circuit, the second end of the pre-level circuit is connected with the first end of the relay, and the second end of the relay is connected with the second output end of the drive circuit. The utility model discloses the utilization can realize making the relay get into the level state in advance before the relay actuation in advance by the level circuit to realize the zero crossing actuation to and at relay on-off switch, cut off the drive power supply of relay, realize the zero crossing disconnection.
Description
Technical Field
The utility model relates to an electrical apparatus field, more specifically say, relate to a relay zero passage control circuit.
Background
The traditional power control circuit adopts a relay to switch a load, because a relay coil is an inductance element, the current of the inductance coil cannot generate sudden change, so that the relay coil needs certain charging time during working, the charging time is called as rise time, the rise time is different according to different relays and generally ranges from 1 ms to 5ms, load systems such as a heating system, a motor system, a water pump system and the like are obtained by the control of the relay, if the tests such as EMI conduction test, click test, power disturbance test, RE space radiation and the like need to add corresponding filter devices, and the cost is high.
If the relay is not switched on or off at the zero crossing point, arcing, ignition and other phenomena can be generated at the load contact end of the relay generally, and the conduction capability of the relay contact and the service life of the relay are directly influenced. In addition, the traditional method needs a system with accurate zero-crossing control, and the silicon controlled rectifier is adopted for control, so that the requirement on temperature rise of the silicon controlled rectifier is high, and the overall cost of the system is high.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a relay zero passage control circuit is provided.
The utility model provides a technical scheme that its technical problem adopted is: a relay zero-crossing control circuit is constructed, comprising: the power supply control circuit comprises a power supply zero-crossing detection circuit, a driving circuit, a pre-level circuit and a control unit;
the detection end of the power supply zero-crossing detection circuit is connected with the input end of a power supply, the output end of the power supply zero-crossing detection circuit is connected with the first zero-crossing detection end of the control unit, the drive end of the control unit is connected with the input end of the drive circuit, the first output end of the drive circuit is connected with the first end of the pre-level circuit, the second end of the pre-level circuit is connected with the first end of the relay, and the second end of the relay is connected with the second output end of the drive circuit;
the power supply zero-crossing detection circuit is used for detecting the input voltage of the power supply and outputting a power supply zero-crossing signal to the control unit when the input voltage of the power supply crosses zero; the control unit outputs a driving control signal to the driving circuit according to the power supply zero-crossing signal so as to control the driving circuit to drive the pre-level circuit; the pre-level circuit pulls up the relay to a prepared level according to the driving of the driving circuit, so that the relay is closed in a zero-crossing way; the control unit also controls the relay to be switched off at zero crossing according to the power supply zero-crossing signal.
Relay zero cross control circuit in, power zero cross detection circuit includes: the detection circuit comprises any one of an isolated photoelectric isolation zero-crossing detection circuit, a transformer coupling zero-crossing detection circuit, a Hall current zero-crossing detection circuit, a non-isolated resistance voltage division sampling zero-crossing detection circuit and a triode zero-crossing detection circuit.
In the relay zero-crossing control circuit of the present invention, the relay zero-crossing control circuit further comprises: the load zero-crossing detection circuit is respectively connected with a second zero-crossing detection end of the control unit and a load;
the load zero-crossing detection circuit is used for detecting load voltage and outputting a load zero-crossing signal to the control unit, and the control unit outputs an adjusting signal to the driving circuit according to the load zero-crossing signal so as to adjust the preparation level of the pre-level circuit.
In the relay zero-crossing control circuit of the present invention, the relay zero-crossing control circuit further comprises: and the power supply circuit is connected with the power supply input end and is used for supplying power to the relay.
In the relay zero-crossing control circuit of the present invention, the power supply circuit includes: a power supply chip;
the positive input end of the power supply chip is connected with the positive end of the power input end, the negative input end of the power supply chip is connected with the negative end of the power input end, a first power supply end of the power supply chip outputs a first power supply voltage, a second end of the power supply chip outputs a second power supply voltage, and the grounding end of the power supply chip is grounded.
Relay zero cross control circuit in, power zero cross detection circuit includes: the first diode, the fourth resistor, the fifth resistor and the first photoelectric coupler;
the anode of the first diode is connected with the positive end of the power input end, the cathode of the first diode is connected with the first end of the first photoelectric coupler through the fourth resistor, the second end of the first photoelectric coupler is connected with the negative end of the power input end through the fifth resistor, the fourth end of the first photoelectric coupler is connected with the first zero-crossing detection end of the control unit, and the third end of the first photoelectric coupler is grounded.
In the relay zero-crossing control circuit of the present invention, the control unit includes: the energy storage capacitor, the second capacitor and the control chip are arranged on the substrate;
the first end of the energy storage capacitor and the first end of the second capacitor are connected and grounded, the second end of the energy storage capacitor and the second end of the second capacitor are connected and connected to a twentieth pin of the control chip, and the twentieth pin of the control chip is also connected to a second power supply end of the power supply chip;
a fifteenth pin of the control chip is used as a first zero-crossing detection end of the control unit and connected with a fourth end of the first photoelectric coupler, and a fourteenth pin of the control chip is used as a second zero-crossing detection end of the control unit and connected to the load zero-crossing detection circuit;
and a sixteenth pin and a seventeenth pin of the control chip are used as driving ends of the control unit and are connected with an input end of the driving circuit, and an eleventh pin of the control chip is connected with a prepared level output end of the pre-level circuit.
In the relay zero-crossing control circuit of the present invention, the driving circuit includes: the circuit comprises a ninth resistor, a seventh resistor, a sixth resistor, a first triode, a second diode, a tenth resistor and a third triode; the pre-level circuit includes: an eighth resistor;
a first end of the ninth resistor is connected with a seventeenth pin of the control chip, a second end of the ninth resistor is connected with a base electrode of the second triode, an emitting electrode of the second triode is grounded, a collector electrode of the second triode is connected with a first end of the seventh resistor, a second end of the seventh resistor is connected with a base electrode of the first triode, an emitting electrode of the first triode is connected with a first power supply end of the power supply chip, a collector electrode of the first triode is connected with a cathode of the second diode, an anode of the second diode is connected with a collector electrode of the third triode, and the sixth resistor is connected between the base electrode and the emitting electrode of the first triode;
the first end of the eighth resistor is connected with the emitting electrode of the first triode, the second end of the eighth resistor is connected with the coil input end of the relay, the second end of the eighth resistor is further connected with the collecting electrode of the first triode, the coil output end of the relay is connected with the anode of the second diode and the collecting electrode of the third triode, the emitting electrode of the third triode is grounded, and the base electrode of the third triode is connected with the sixteenth pin of the control chip through the tenth resistor.
Relay zero cross control circuit in, load zero cross detection circuit includes: the second photoelectric coupler, the eleventh resistor, the twelfth resistor and the third diode;
the fourth end of the second photoelectric coupler is connected with the fourteenth pin of the control chip, the third end of the second photoelectric coupler is grounded, the first end of the second photoelectric coupler is connected with the first end of the eleventh resistor, the second end of the eleventh resistor is connected with the cathode of the third diode, the anode of the third diode is connected with the first end of the load, and the second end of the second photoelectric coupler is connected with the second end of the load through the twelfth resistor.
In the relay zero-crossing control circuit of the present invention, the relay zero-crossing control circuit further comprises: and the input circuit is arranged between the power supply input end and the power supply circuit and is used for processing the input voltage.
Implement the utility model discloses a relay zero passage control circuit has following beneficial effect: the method comprises the following steps: the power supply control circuit comprises a power supply zero-crossing detection circuit, a driving circuit, a pre-level circuit and a control unit; the detection end of the power supply zero-crossing detection circuit is connected with the power supply input end, the output end of the power supply zero-crossing detection circuit is connected with the first zero-crossing detection end of the control unit, the drive end of the control unit is connected with the input end of the drive circuit, the first output end of the drive circuit is connected with the first end of the pre-level circuit, the second end of the pre-level circuit is connected with the first end of the relay, and the second end of the relay is connected with the second output end of the drive circuit. The utility model discloses the utilization can realize making the relay get into the level state in advance before the relay actuation in advance by the level circuit to realize the zero crossing actuation to and at relay on-off switch, cut off the power supply of relay, realize the zero crossing disconnection.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic block diagram of a relay zero-crossing control circuit provided by an embodiment of the present invention;
fig. 2 to fig. 4 are circuit diagrams of a relay zero-crossing control circuit provided by an embodiment of the present invention;
fig. 5 is a schematic diagram of a level curve of a relay according to an embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic block diagram of a relay zero-crossing control circuit provided by the present invention.
As shown in fig. 1, the relay zero-crossing control circuit includes: a power supply zero-crossing detection circuit 101, a drive circuit 103, a pre-level circuit 105 and a control unit 102.
The detection end of the power supply zero-crossing detection circuit 101 is connected with the power supply input end, the output end of the power supply zero-crossing detection circuit 101 is connected with the first zero-crossing detection end of the control unit 102, the driving end of the control unit 102 is connected with the input end of the driving circuit 103, the first output end of the driving circuit 103 is connected with the first end of the pre-level circuit 105, the second end of the pre-level circuit 105 is connected with the first end of the relay, and the second end of the relay is connected with the second output end of the driving circuit 103.
The power supply zero-crossing detection circuit 101 is used for detecting the input voltage of the power supply and outputting a power supply zero-crossing signal to the control unit 102 when the input voltage of the power supply crosses zero; the control unit 102 outputs a driving control signal to the driving circuit 103 according to the power zero-crossing signal to control the driving circuit 103 to drive the pre-level circuit 105; the pre-level circuit 105 pulls up the relay to a pre-level according to the driving of the driving circuit 103, so that the relay is closed in a zero-crossing way; the control unit 102 also controls the relay to be switched off at zero crossing according to the power supply zero crossing signal.
Optionally, in the embodiment of the present invention, the power zero-crossing detection circuit 101 includes: the detection circuit comprises any one of an isolated photoelectric isolation zero-crossing detection circuit, a transformer coupling zero-crossing detection circuit, a Hall current zero-crossing detection circuit, a non-isolated resistance voltage division sampling zero-crossing detection circuit and a triode zero-crossing detection circuit.
Further, in some embodiments, the relay zero crossing control circuit further comprises: and the load zero-crossing detection circuit 104 is respectively connected with the second zero-crossing detection end of the control unit 102 and the load. The load zero-crossing detection circuit 104 is configured to detect a load voltage and output a load zero-crossing signal to the control unit 102, and the control unit 102 outputs an adjustment signal to the driving circuit 103 according to the load zero-crossing signal to adjust the pre-level of the pre-level circuit 105.
The load zero-crossing detection circuit 104 is arranged to monitor the on-off of the relay and adjust the pre-level generated by the pre-level circuit 105 based on the obtained load zero-crossing signal, so as to meet the discreteness of relays with different specifications or relays with the same specification.
Further, in some embodiments, the relay zero crossing control circuit further comprises: and a power supply circuit 106 connected to the power input terminal for supplying power to the relay. It will be appreciated that by providing the power supply circuit 106, a corresponding operating voltage can be provided for stable pull-in of the relay.
Further, in some embodiments, the relay zero crossing control circuit further comprises: an input circuit 107 arranged between the power supply input and the supply circuit 106 for processing the input voltage. The input circuit 107 can perform filtering processing and EMC processing on the input voltage.
The embodiment of the utility model provides an in, through setting up level circuit 105 in advance, can supply a level that is less than relay actuation voltage before the relay actuation to make the relay be in a transient state. For example, for a 12V relay, if the pull-in voltage is 9V, a pre-level lower than 9V, for example, 8.5V, may be set, so that the relay is in a state to be pulled in, and the relay coil has current, but not to cause pull-in. Therefore, the closing time is synchronous with the power supply zero-crossing signal time, and zero-crossing closing is realized. Therefore, the phenomena of arc discharge, ignition and the like at the load contact end of the relay are effectively avoided, and the EMC interference is further reduced. Meanwhile, the method for enabling the relay to achieve zero-crossing pull-in is simple and low in overall cost by providing the pre-level before the relay is pulled in.
The driving circuit 103 may put the relay in a state of 0 voltage, a pre-level voltage, an operating voltage, a release voltage, etc., and a functional circuit of state switching according to the control of the control unit 102.
The utility model discloses an before the relay is opened, let the relay get into the pre-level state earlier, eliminate because the relay actuation time delay that the inductance coils difference leads to, get into the actuation state by the preparation during the actuation, make actuation time and power zero cross signal opportunity synchronous, realize the zero cross actuation. Before the relay is disconnected, the driving power supply of the relay is cut off in advance, and when the driving voltage of the relay is reduced to the release voltage threshold of the relay, the driving voltage is synchronous with the load zero-crossing signal, so that the relay is disconnected in a zero-crossing mode. The level curve of the relay is shown in fig. 3.
Specifically, as shown in fig. 2 to fig. 4, the circuit diagram of the relay zero-cross control circuit provided by the embodiment of the present invention is shown.
As shown in fig. 2, the input circuit 107 includes: the circuit comprises a fuse F1, a TVS tube VR1, a second resistor R2, a third resistor R3, a first resistor R1 and a first capacitor C1. The first end of the fuse F1 is connected to the positive end of the power input end, the second end of the fuse F1 is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is connected to the anode of the first diode D1 and the positive input end of the power supply chip U0. The first end of the TVS tube VR1 is connected with the second end of the fuse tube F1, the second end of the TVS tube VR1 is connected with the negative end of the power input end, the second resistor R2 and the third resistor R3 are connected in series and then connected in parallel with the TVS tube VR1, and the first capacitor C1 is connected in parallel with a series circuit formed by the second resistor R2 and the third resistor R3.
The power supply circuit 106 includes: and a power supply chip U0.
The positive end of power input end is connected to the positive input end of power supply chip U0, and the negative terminal of power input end is connected to the negative input end of power supply chip U0, and first supply voltage is exported to the first feed end of power supply chip U0, and second supply voltage is exported to the second end of power supply chip U0, and power supply chip U0's earthing terminal ground connection.
The power supply zero-cross detection circuit 101 includes: a first diode D1, a fourth resistor R4, a fifth resistor R5, and a first photocoupler U1.
The anode of the first diode D1 is connected with the positive end of the power input end, the cathode of the first diode D1 is connected with the first end of the first photoelectric coupler U1 through the fourth resistor R4, the second end of the first photoelectric coupler U1 is connected with the negative end of the power input end through the fifth resistor R5, the fourth end of the first photoelectric coupler U1 is connected with the first zero-crossing detection end of the control unit 102, and the third end of the first photoelectric coupler U1 is grounded.
The control unit 102 includes: the energy storage capacitor EC1, the second capacitor C2 and the control chip U2.
The first end of the energy storage capacitor EC1 and the first end of the second capacitor C2 are connected and grounded, the second end of the energy storage capacitor EC1 and the second end of the second capacitor C2 are connected and connected to the twentieth pin of the control chip U2, and the twentieth pin of the control chip U2 is also connected to the second power supply end of the power supply chip U0; a fifteenth pin of the control chip U2 is connected to the fourth terminal of the first photocoupler U1 as a first zero-cross detection end of the control unit 102, and a fourteenth pin of the control chip U2 is connected to the load zero-cross detection circuit 104 as a second zero-cross detection end of the control unit 102; the sixteenth pin and the seventeenth pin of the control chip U2 are used as driving terminals of the control unit 102 to be connected to the input terminal of the driving circuit 103, and the eleventh pin of the control chip U2 is connected to the preliminary level output terminal of the pre-level circuit 105.
The drive circuit 103 includes: a ninth resistor R9, a seventh resistor R7, a sixth resistor R6, a first transistor Q1, a second transistor Q2, a second diode D2, a tenth resistor R10, and a third transistor Q3; the pre-level circuit 105 includes: an eighth resistor R8.
A first end of a ninth resistor R9 is connected with a seventeenth pin of the control chip U2, a second end of a ninth resistor R9 is connected with a base electrode of a second triode Q2, an emitter electrode of the second triode Q2 is grounded, a collector electrode of the second triode Q2 is connected with a first end of a seventh resistor R7, a second end of a seventh resistor R7 is connected with a base electrode of the first triode Q1, an emitter electrode of a first triode Q1 is connected with a first power supply end of the power supply chip U0, a collector electrode of the first triode Q1 is connected with a cathode electrode of a second diode D2, an anode electrode of the second diode D63 2 is connected with a collector electrode of the third triode Q3, and a sixth resistor R6 is connected between the base electrode and the emitter electrode of the first triode Q1; the first end of the eighth resistor R8 is connected with the emitter of the first triode Q1, the second end of the eighth resistor R8 is connected with the coil input end of the relay, the second end of the eighth resistor R8 is also connected with the collector of the first triode Q1, the coil output end of the relay is connected with the anode of the second diode D2 and the collector of the third triode Q3, the emitter of the third triode Q3 is grounded, and the base of the third triode Q3 is connected with the sixteenth pin of the control chip U2 through the tenth resistor R10.
The load zero-cross detection circuit 104 includes: a second photocoupler U3, an eleventh resistor R11, a twelfth resistor R12 and a third diode D3.
The fourth end of the second photocoupler U3 is connected with the fourteenth pin of the control chip U2, the third end of the second photocoupler U3 is grounded, the first end of the second photocoupler U3 is connected with the first end of the eleventh resistor R11, the second end of the eleventh resistor R11 is connected with the cathode of the third diode D3, the anode of the third diode D3 is connected with the first end of the load, and the second end of the second photocoupler U3 is connected with the second end of the load through the twelfth resistor R12.
The utility model discloses relay zero passage control circuit can be in order to be applicable to fixed type's relay, only need this moment according to the actuation voltage setting of fixed type's relay a fixed level in advance can.
Of course, the method can also be applied to relays of different types, and at this time, the type of the relay can be detected by detecting the load zero-crossing signal of the load zero-crossing detection circuit 104, and the pre-level is adjusted based on the load zero-crossing detection signal. Specifically, as shown in fig. 2, the signal output from the seventeenth pin (C _ REL _ L1) of the control chip U2 is a PWM control signal, and when the C _ REL _ L2 is turned on, the pre-level increases as the dot-to-space ratio of the C _ REL _ L1 increases.
When pre-level parameters are set for different relays, C _ REL _ L2 is conducted, duty ratio parameters of C _ REL _ L1 are fixedly changed from small to large step by step, load zero-crossing signals are continuously detected, when the duty ratio is increased to the point that the load zero-crossing signals detect the signals, the duty ratio of the PWM control signals corresponds to the minimum pull-in voltage, at the moment, the optimal pre-level is smaller than the corresponding minimum pull-in voltage, and the MCU records the corresponding PWM duty ratio as the optimal pre-level voltage.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and implement the present invention accordingly, which can not limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.
Claims (10)
1. A relay zero crossing control circuit, comprising: the power supply control circuit comprises a power supply zero-crossing detection circuit, a driving circuit, a pre-level circuit and a control unit;
the detection end of the power supply zero-crossing detection circuit is connected with the input end of a power supply, the output end of the power supply zero-crossing detection circuit is connected with the first zero-crossing detection end of the control unit, the drive end of the control unit is connected with the input end of the drive circuit, the first output end of the drive circuit is connected with the first end of the pre-level circuit, the second end of the pre-level circuit is connected with the first end of the relay, and the second end of the relay is connected with the second output end of the drive circuit;
the power supply zero-crossing detection circuit is used for detecting the input voltage of the power supply and outputting a power supply zero-crossing signal to the control unit when the input voltage of the power supply crosses zero; the control unit outputs a driving control signal to the driving circuit according to the power supply zero-crossing signal so as to control the driving circuit to drive the pre-level circuit; the pre-level circuit pulls up the relay to a prepared level according to the driving of the driving circuit, so that the relay is closed in a zero-crossing way; the control unit also controls the relay to be switched off at zero crossing according to the power supply zero-crossing signal.
2. The relay zero-crossing control circuit according to claim 1, wherein the power supply zero-crossing detection circuit comprises: the detection circuit comprises any one of an isolated photoelectric isolation zero-crossing detection circuit, a transformer coupling zero-crossing detection circuit, a Hall current zero-crossing detection circuit, a non-isolated resistance voltage division sampling zero-crossing detection circuit and a triode zero-crossing detection circuit.
3. A relay zero-crossing control circuit as claimed in claim 1, further comprising: the load zero-crossing detection circuit is respectively connected with a second zero-crossing detection end of the control unit and a load;
the load zero-crossing detection circuit is used for detecting load voltage and outputting a load zero-crossing signal to the control unit, and the control unit outputs an adjusting signal to the driving circuit according to the load zero-crossing signal so as to adjust the preparation level of the pre-level circuit.
4. A relay zero crossing control circuit as claimed in claim 3, further comprising: and the power supply circuit is connected with the power supply input end and is used for supplying power to the relay.
5. Relay zero-crossing control circuit according to claim 4, characterized in that the supply circuit comprises: a power supply chip;
the positive input end of the power supply chip is connected with the positive end of the power input end, the negative input end of the power supply chip is connected with the negative end of the power input end, a first power supply end of the power supply chip outputs a first power supply voltage, a second end of the power supply chip outputs a second power supply voltage, and the grounding end of the power supply chip is grounded.
6. The relay zero-crossing control circuit according to claim 5, wherein the power supply zero-crossing detection circuit comprises: the first diode, the fourth resistor, the fifth resistor and the first photoelectric coupler;
the anode of the first diode is connected with the positive end of the power input end, the cathode of the first diode is connected with the first end of the first photoelectric coupler through the fourth resistor, the second end of the first photoelectric coupler is connected with the negative end of the power input end through the fifth resistor, the fourth end of the first photoelectric coupler is connected with the first zero-crossing detection end of the control unit, and the third end of the first photoelectric coupler is grounded.
7. Relay zero-crossing control circuit according to claim 6, characterized in that the control unit comprises: the energy storage capacitor, the second capacitor and the control chip are arranged on the substrate;
the first end of the energy storage capacitor and the first end of the second capacitor are connected and grounded, the second end of the energy storage capacitor and the second end of the second capacitor are connected and connected to a twentieth pin of the control chip, and the twentieth pin of the control chip is also connected to a second power supply end of the power supply chip;
a fifteenth pin of the control chip is used as a first zero-crossing detection end of the control unit and connected with a fourth end of the first photoelectric coupler, and a fourteenth pin of the control chip is used as a second zero-crossing detection end of the control unit and connected to the load zero-crossing detection circuit;
and a sixteenth pin and a seventeenth pin of the control chip are used as driving ends of the control unit and are connected with an input end of the driving circuit, and an eleventh pin of the control chip is connected with a prepared level output end of the pre-level circuit.
8. A relay zero-crossing control circuit as claimed in claim 7, wherein the drive circuit comprises: the circuit comprises a ninth resistor, a seventh resistor, a sixth resistor, a first triode, a second diode, a tenth resistor and a third triode; the pre-level circuit includes: an eighth resistor;
a first end of the ninth resistor is connected with a seventeenth pin of the control chip, a second end of the ninth resistor is connected with a base electrode of the second triode, an emitting electrode of the second triode is grounded, a collector electrode of the second triode is connected with a first end of the seventh resistor, a second end of the seventh resistor is connected with a base electrode of the first triode, an emitting electrode of the first triode is connected with a first power supply end of the power supply chip, a collector electrode of the first triode is connected with a cathode of the second diode, an anode of the second diode is connected with a collector electrode of the third triode, and the sixth resistor is connected between the base electrode and the emitting electrode of the first triode;
the first end of the eighth resistor is connected with the emitting electrode of the first triode, the second end of the eighth resistor is connected with the coil input end of the relay, the second end of the eighth resistor is further connected with the collecting electrode of the first triode, the coil output end of the relay is connected with the anode of the second diode and the collecting electrode of the third triode, the emitting electrode of the third triode is grounded, and the base electrode of the third triode is connected with the sixteenth pin of the control chip through the tenth resistor.
9. The relay zero-crossing control circuit of claim 8, wherein the load zero-crossing detection circuit comprises: the second photoelectric coupler, the eleventh resistor, the twelfth resistor and the third diode;
the fourth end of the second photoelectric coupler is connected with the fourteenth pin of the control chip, the third end of the second photoelectric coupler is grounded, the first end of the second photoelectric coupler is connected with the first end of the eleventh resistor, the second end of the eleventh resistor is connected with the cathode of the third diode, the anode of the third diode is connected with the first end of the load, and the second end of the second photoelectric coupler is connected with the second end of the load through the twelfth resistor.
10. A relay zero crossing control circuit as claimed in claim 9, further comprising: and the input circuit is arranged between the power supply input end and the power supply circuit and is used for processing the input voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120974126.4U CN214898258U (en) | 2021-05-08 | 2021-05-08 | Relay zero-crossing control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120974126.4U CN214898258U (en) | 2021-05-08 | 2021-05-08 | Relay zero-crossing control circuit |
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| Publication Number | Publication Date |
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| CN214898258U true CN214898258U (en) | 2021-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120974126.4U Active CN214898258U (en) | 2021-05-08 | 2021-05-08 | Relay zero-crossing control circuit |
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| CN (1) | CN214898258U (en) |
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2021
- 2021-05-08 CN CN202120974126.4U patent/CN214898258U/en active Active
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