Relay circuit and solid-state relay
By combining optocoupler isolation modules, transistors, and thyristors with RC snubber circuits, the problems of high cost and easy damage of solid-state relays are solved, achieving cost reduction and simplified operation, while also providing peak voltage absorption capability.
Patent Information
- Application Number
- CN202422835795.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-11-20
AI Technical Summary
Existing solid-state relays are expensive, difficult to repair, and cumbersome to use, requiring the addition of external spike absorption circuits to ensure reliability.
By combining optocoupler isolation modules, transistors, and thyristors in modular form, along with RC snubber circuits, operation is simplified and peak voltages are absorbed.
It reduces usage costs, simplifies operation procedures, has peak absorption capabilities, and improves reliability.
Smart Images
Figure CN223540537U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hardware circuit technology, and in particular to a relay circuit and a solid-state relay. Background Technology
[0002] Currently, relay circuits consist of optocoupler interface circuits, trigger circuits, and switching circuits. They are devices that use small signals to control large signals and are widely used in production and daily life. Furthermore, current solid-state relays are packaged in modular form, making them expensive and difficult to repair; if they break, they must be replaced, increasing operating costs. Moreover, for reliable operation, external spike absorption circuits are required, making the process cumbersome. Utility Model Content
[0003] The purpose of this invention is to provide a relay circuit and a solid-state relay to alleviate the technical problems of cumbersome use in the prior art and to facilitate use.
[0004] In a first aspect, this utility model provides a relay circuit, including: an optocoupler isolation module, a transistor, and a thyristor; the positive terminal of the light-emitting diode in the optocoupler isolation module is connected to the driving terminal of a peripheral device; the collector of the phototransistor in the optocoupler isolation module is connected to the base of the transistor; the collector of the transistor is connected to the control terminal of the thyristor; the negative terminal of the thyristor is grounded; a resistor-capacitor absorption circuit is connected between the positive and negative terminals of the thyristor; the positive terminal of the thyristor is also connected to the load of the peripheral device. The terminals are connected; the optocoupler isolation module is used to perform on or off actions based on the drive signal of the drive terminal and output a first control signal; the transistor is used to perform on or off actions in response to the first control signal and output a second control signal; the thyristor is used to perform on or off actions in response to the second control signal to control the load terminals to perform on or off actions; wherein, when the state of the thyristor switches from on to off, the RC snubber circuit is used to absorb the spike voltage of the thyristor.
[0005] In a preferred embodiment of this utility model, the above-mentioned RC snubber circuit includes a first resistor and a first capacitor connected in series.
[0006] In a preferred embodiment of this utility model, the relay circuit further includes: a transient suppression diode; the negative terminal of the light-emitting diode in the optocoupler isolation module is grounded; the transient suppression diode is connected between the driving terminal and the negative terminal of the light-emitting diode in the optocoupler isolation module; the transient suppression diode is used to absorb the surge voltage of the driving terminal.
[0007] In a preferred embodiment of this utility model, the relay circuit further includes: a switching diode; a second resistor is connected between the positive terminal of the light-emitting diode in the optocoupler isolation module and the driving terminal; the positive terminal of the light-emitting diode in the optocoupler isolation module is connected to the negative terminal of the switching diode; and the negative terminal of the light-emitting diode in the optocoupler isolation module is connected to the positive terminal of the switching diode.
[0008] In a preferred embodiment of this utility model, the relay circuit further includes: a third resistor and an indicator light; one end of the third resistor is connected to the driving terminal, and the other end is connected to the positive terminal of the indicator light; the negative terminal of the indicator light is grounded; the third resistor is used to limit the current of the voltage at the driving terminal; and the indicator light is used to flash or turn off based on the driving signal.
[0009] In a preferred embodiment of this utility model, the emitter of the transistor is connected to the power supply of the peripheral device; a fourth resistor is connected between the base of the transistor and the power supply; and a fifth resistor is connected between the base of the transistor and the collector of the phototransistor in the optocoupler isolation module.
[0010] In a preferred embodiment of this utility model, a current limiting circuit is further connected between the collector of the transistor and the control electrode of the thyristor; the current limiting circuit is used to limit the voltage between the collector of the transistor and the control electrode of the thyristor.
[0011] In a preferred embodiment of this utility model, the current limiting circuit includes a sixth resistor, a seventh resistor, and an eighth resistor connected in parallel.
[0012] In a preferred embodiment of this utility model, the load terminal is connected to the DC power supply of the external device; the DC power supply is connected to the load; when the load terminal is turned on, the DC power supply is turned on to the load.
[0013] Secondly, this utility model embodiment provides a solid-state relay, including the above-mentioned relay circuit.
[0014] The present invention has the following beneficial technical effects:
[0015] This utility model provides a relay circuit and a solid-state relay, including: an optocoupler isolation module, a transistor, and a thyristor; the positive terminal of the light-emitting diode in the optocoupler isolation module is connected to the driving terminal of a peripheral device; the collector of the phototransistor in the optocoupler isolation module is connected to the base of the phototransistor; the collector of the phototransistor is connected to the control terminal of the thyristor; the negative terminal of the thyristor is grounded; a resistor-capacitor absorption circuit is connected between the positive and negative terminals of the thyristor; the positive terminal of the thyristor is also connected to the negative terminal of the peripheral device. The load terminals are connected; the optocoupler isolation module is used to perform on or off actions based on the drive signal from the drive terminal, and outputs a first control signal; the transistor is used to perform on or off actions in response to the first control signal, and outputs a second control signal; the thyristor is used to perform on or off actions in response to the second control signal, so as to control the load terminals to perform on or off actions; wherein, when the state of the thyristor switches from on to off, the RC snubber circuit is used to absorb the spike voltage of the thyristor. This relay circuit combines the optocoupler isolation module, transistor, and thyristor in a modular form, and is equipped with an RC snubber circuit, which not only reduces costs, but also has a spike absorption function and simplifies operation. Attached Figure Description
[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0017] Figure 1 A schematic diagram of a relay circuit provided in an embodiment of this utility model;
[0018] Figure 2 This is a schematic diagram of another relay circuit provided in an embodiment of the present utility model;
[0019] Figure 3 This is a schematic diagram of the structure of a solid-state relay provided in an embodiment of the present invention.
[0020] Icons: 11-Optical isolation module; 12-Transistor; 13-SCR; 32-Solid-state relay; 31-Relay circuit. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0022] Current solid-state relays are packaged in modular form, which are expensive and difficult to repair. If they break, they can only be replaced, which increases the cost of use. In addition, for reliable use, a spike absorption circuit needs to be added to the outside, making the process cumbersome.
[0023] Based on this, the present invention provides a relay circuit and a solid-state relay. This relay circuit combines an optocoupler isolation module, a transistor, and a thyristor in a modular form, and incorporates an RC snubber circuit, which not only reduces costs but also provides spike absorption functionality and simplifies operation. To facilitate understanding of the present invention, a relay circuit is first introduced.
[0024] Example 1
[0025] In this embodiment of the utility model, Figure 1 This is a schematic diagram of a relay circuit provided for an embodiment of the present utility model.
[0026] Depend on Figure 1 As seen, the relay circuit includes: an optocoupler isolation module 11, a transistor 12, and a silicon controlled rectifier (SCR) 13; the positive terminal of the light-emitting diode in the optocoupler isolation module 11 is connected to the driving terminal of the peripheral device; the collector of the phototransistor in the optocoupler isolation module 11 is connected to the base of the transistor 12; the collector of the transistor 12 is connected to the control terminal of the SCR 13; the negative terminal of the SCR 13 is grounded; a resistor-capacitor (RC) snubber circuit is connected between the positive and negative terminals of the SCR 13; the positive terminal of the SCR 13 is also connected to the negative terminal of the peripheral device. The load terminals are connected; the optocoupler isolation module 11 is used to perform on or off actions based on the drive signal of the drive terminal, and outputs a first control signal; the transistor 12 is used to perform on or off actions in response to the first control signal, and outputs a second control signal; the thyristor 13 is used to perform on or off actions in response to the second control signal, so as to control the load terminals to perform on or off actions; wherein, when the state of the thyristor 13 switches from on to off, the RC snubber circuit is used to absorb the spike voltage of the thyristor.
[0027] To facilitate understanding of the embodiments of this utility model, Figure 2 This is a schematic diagram of another relay circuit provided in an embodiment of the present invention.
[0028] Depend on Figure 2 As seen above, the aforementioned RC snubber circuit includes a first resistor and a first capacitor connected in series. The first resistor is represented by R8, and the first capacitor is represented by C1.
[0029] Furthermore, the aforementioned relay circuit also includes: a transient suppression diode; the negative terminal of the light-emitting diode in the aforementioned optocoupler isolation module is grounded; the transient suppression diode is connected between the aforementioned driving terminal and the negative terminal of the light-emitting diode in the aforementioned optocoupler isolation module; the transient suppression diode is used to absorb the surge voltage of the aforementioned driving terminal. The transient suppression diode is represented by TVS1.
[0030] Furthermore, the positive electrode and the negative electrode of the aforementioned silicon controlled rectifier 13 are represented by A and K, respectively.
[0031] Furthermore, the aforementioned relay circuit also includes: a switching diode; a second resistor connected between the anode of the LED in the optocoupler isolation module and the driving terminal; the anode of the LED in the optocoupler isolation module connected to the cathode of the switching diode; and the cathode of the LED in the optocoupler isolation module connected to the anode of the switching diode. The second resistor is represented by R2, and the switching diode by D1.
[0032] Furthermore, the aforementioned relay circuit also includes: a third resistor and an indicator light; one end of the third resistor is connected to the driving terminal, and the other end is connected to the positive terminal of the indicator light; the negative terminal of the indicator light is grounded; the third resistor is used to limit the current of the driving terminal; the indicator light is used to flash or turn off based on the driving signal. The third resistor is represented by R1, and the indicator light is represented by LED1.
[0033] Furthermore, the emitter of the aforementioned transistor 12 is connected to the power supply of the peripheral device; a fourth resistor is connected between the base of the aforementioned transistor 12 and the aforementioned power supply; and a fifth resistor is connected between the base of the aforementioned transistor and the collector of the phototransistor 12 within the aforementioned optocoupler isolation module. The aforementioned power supply is represented by VCC1, the aforementioned fourth resistor by R3, and the aforementioned fifth resistor by R4.
[0034] Furthermore, a current-limiting circuit is connected between the collector of the transistor 12 and the control electrode of the thyristor 13; the current-limiting circuit is used to limit the voltage between the collector of the transistor 12 and the control electrode of the thyristor 13. The thyristor 13 is represented by Q2, and the control electrode of the thyristor 13 is represented by G.
[0035] Furthermore, the aforementioned current-limiting circuit includes a sixth resistor, a seventh resistor, and an eighth resistor connected in parallel. The sixth resistor is represented by R5, the seventh resistor by R6, and the eighth resistor by R7.
[0036] Furthermore, the aforementioned load terminal is connected to the DC power supply of the external device; the aforementioned DC power supply is connected to the load; when the aforementioned load terminal is turned on, the aforementioned DC power supply is turned on by the aforementioned load. The aforementioned load terminal is represented by JP1.
[0037] This utility model embodiment provides a relay circuit, including: an optocoupler isolation module, a transistor, and a thyristor; the positive terminal of the light-emitting diode in the optocoupler isolation module is connected to the driving terminal of a peripheral device; the collector of the phototransistor in the optocoupler isolation module is connected to the base of the phototransistor; the collector of the phototransistor is connected to the control terminal of the thyristor; the negative terminal of the thyristor is grounded; a resistor-capacitor (RC) snubber circuit is connected between the positive and negative terminals of the thyristor; the positive terminal of the thyristor is also connected to the load terminal of the peripheral device; the optocoupler isolation module is used to perform a conduction or cutoff action based on the driving signal of the driving terminal, and outputs a first control signal; the transistor is used to perform a conduction or cutoff action in response to the first control signal, and outputs a second control signal; the thyristor is used to perform a conduction or cutoff action in response to the second control signal, so as to control the load terminal to perform a conduction or cutoff action; wherein, when the state of the thyristor switches from conduction to cutoff, the RC snubber circuit is used to absorb the peak voltage of the thyristor. This relay circuit combines an optocoupler isolation module, a transistor, and a thyristor in a modular form, and is equipped with an RC snubber circuit, which not only reduces costs but also has a spike absorption function, simplifying operation.
[0038] Example 2
[0039] Based on the above embodiments, Figure 3 This is a schematic diagram of the structure of a solid-state relay provided in an embodiment of the present invention.
[0040] Depend on Figure 3 As seen, the solid-state relay 32 includes the relay circuit 31 in the above embodiment.
[0041] The solid-state relay provided in this embodiment has the same technical features as the relay circuit provided in Embodiment 1 above, and therefore can solve the same technical problems and achieve the same technical effects. Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the solid-state relay described above can be referred to the corresponding structure of the relay circuit in Embodiment 1 above, and will not be repeated here.
[0042] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0043] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A relay circuit, characterized in that, include: Optocoupler isolation module, transistor and thyristor; The positive terminal of the light-emitting diode in the optocoupler isolation module is connected to the driving terminal of the peripheral device; the collector of the phototransistor in the optocoupler isolation module is connected to the base of the phototransistor; the collector of the phototransistor is connected to the control terminal of the thyristor; the negative terminal of the thyristor is grounded; a resistor-capacitor absorption circuit is connected between the positive and negative terminals of the thyristor; the positive terminal of the thyristor is also connected to the load terminal of the peripheral device. The optocoupler isolation module is used to perform a turn-on or turn-off action based on the drive signal of the drive end, and outputs a first control signal; The transistor is used to turn on or off in response to the first control signal and output the second control signal. The thyristor is used to respond to the second control signal to turn on or off, thereby controlling the load terminals to turn on or off; wherein, when the state of the thyristor switches from on to off, the RC snubber circuit is used to absorb the voltage spike of the thyristor.
2. The relay circuit according to claim 1, characterized in that, The RC snubber circuit includes a first resistor and a first capacitor connected in series.
3. The relay circuit according to claim 1, characterized in that, The relay circuit further includes: a transient suppression diode; The negative terminal of the light-emitting diode in the optocoupler isolation module is grounded; the transient suppression diode is connected between the driving terminal and the negative terminal of the light-emitting diode in the optocoupler isolation module. The transient suppression diode is used to absorb the surge voltage at the drive end.
4. The relay circuit according to claim 3, characterized in that, The relay circuit also includes: a switching diode; A second resistor is connected between the positive terminal of the light-emitting diode in the optocoupler isolation module and the driving terminal; the positive terminal of the light-emitting diode in the optocoupler isolation module is connected to the negative terminal of the switching diode; the negative terminal of the light-emitting diode in the optocoupler isolation module is connected to the positive terminal of the switching diode.
5. The relay circuit according to claim 1, characterized in that, The relay circuit further includes: a third resistor and an indicator light; one end of the third resistor is connected to the driving terminal, and the other end is connected to the positive terminal of the indicator light; the negative terminal of the indicator light is grounded; The third resistor is used to limit the current of the voltage at the drive terminal; The indicator light is used to flash or turn off based on the drive signal.
6. The relay circuit according to claim 1, characterized in that, The emitter of the transistor is connected to the power supply of the peripheral device; a fourth resistor is connected between the base of the transistor and the power supply; a fifth resistor is connected between the base of the transistor and the collector of the phototransistor in the optocoupler isolation module.
7. The relay circuit according to claim 1, characterized in that, A current-limiting circuit is also connected between the collector of the transistor and the control electrode of the thyristor. The current-limiting circuit is used to limit the voltage between the collector of the transistor and the control electrode of the thyristor.
8. The relay circuit according to claim 7, characterized in that, The current limiting circuit includes a sixth resistor, a seventh resistor, and an eighth resistor connected in parallel.
9. The relay circuit according to claim 1, characterized in that, The load terminal is connected to the external DC power supply; the DC power supply is connected to the load. When the load terminal is connected, the DC power supply is connected to the load.
10. A solid-state relay, characterized in that, Includes the relay circuit described in any one of claims 1 to 9.