Integrated solid state relay with monitoring function

Abstract

The application discloses an integrated solid-state relay with a monitoring function, which is characterized in that a first photoelectric coupler and a second photoelectric coupler are arranged in series to trigger an output load circuit to be turned on, and meanwhile, the second photoelectric coupler is turned on to feed back to an alarm output circuit, so that the alarm circuit is turned on to output. When the output load circuit is short-circuited or open-circuited, the alarm output circuit is disconnected to alarm, and the input control circuit loses the control signal to make the first photoelectric coupler output to be turned off to disconnect the output load circuit. In the case that the main power supply is lost, the load is lost, the relay is broken down, and the load output end is short-circuited, the alarm is given and the control circuit is disconnected, so that the functions of protecting the solid-state relay, the electric equipment and the personal safety are achieved, the safety and stability of the relay are improved, the circuit structure is simple, the reaction is sensitive and fast, the installation is convenient, and the applicability is strong.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of relays, in particular to an integrated solid-state relay with monitoring function. BACKGROUND

[0002] As an electronic switch, solid-state relay has no mechanical contact components in its on and off, and is more reliable, faster, and has no noise and fire. In addition, it has a small control current and is compatible with CMOS circuits. Therefore, solid-state relays have been widely used in computer interface devices, electric furnace heating constant temperature systems, remote control systems, industrial automation devices, lighting stage light control, instruments and meters, automatic washing machines, security systems, and as power factor compensation power capacitor switching switches. In addition, it has a wide range of applications in chemical industry, explosion-proof, moisture-proof, corrosion-resistant or strong electrically isolated occasions.

[0003] AC solid-state relay is a kind of relay with thyristor (thyristor) as switching device, which has the advantages of high efficiency, no mechanical noise and wear, fast response, small size, long service life and easy use. However, the general solid-state relay has no more protection function, and it is difficult to monitor and distinguish the fault position and cause when a fault occurs in practical application, and it will cause a series of safety problems.

[0004] Therefore, it is necessary to improve the structure of the existing solid-state relay to monitor whether the relay is faulty and improve the stability and safety. SUMMARY

[0005] The technical problem to be solved by the present application is that the existing relay lacks monitoring control and protection function, and the safety is insufficient.

[0006] In order to solve the above technical problems, the technical scheme adopted by the present application is to provide an integrated solid-state relay with monitoring function, which comprises a relay shell and a circuit board, and the circuit comprises:

[0007] An input control circuit is used for controlling the input of electrical signal, and is connected with the power supply through the input control end;

[0008] An output load circuit is used for controlling the output of electrical signal to the load output end, and is connected with the input control circuit through the first optocoupler and the inductor;

[0009] An alarm output circuit is used to control the output of an electrical signal to the alarm output terminal. It is connected to the input control circuit and the output load circuit through a second optocoupler. The first optocoupler and the second optocoupler are connected in series to trigger the output load circuit. The input control circuit is provided with a first light-emitting diode for displaying the working status, and the alarm output circuit is provided with a second light-emitting diode for displaying the alarm status.

[0010] In the above technical solution, the input control terminal includes a first positive terminal and a first negative terminal, the output load terminal includes a power supply terminal and a load terminal, and the alarm output terminal includes a second positive terminal and a second negative terminal.

[0011] In the above technical solution, in the input control circuit, the first positive terminal is connected to the input terminal of the first optocoupler through the first resistor and the fifth resistor, and then through the constant current circuit composed of the first transistor, the second transistor, the fourth resistor, the sixth resistor, the fourth capacitor, and the fifth capacitor to form a loop to the first negative terminal.

[0012] In the above technical solution, the output terminal of the first optocoupler is connected to the inductor and the second optocoupler, triggering the first and second thyristors to connect the output load circuit.

[0013] In the above technical solution, the first light-emitting diode, the second capacitor, and the second resistor constitute a working status indication circuit, and the first diode is for reverse connection protection.

[0014] In the above technical solution, the second diode and the third diode are connected in series and then connected in parallel with the load output terminal to form overvoltage protection, and the sixth capacitor and the seventeenth resistor are connected in series to form a buffer absorption circuit and connected in parallel with the load output terminal.

[0015] In the above technical solution, the first diode and the third diode are TVS transient suppression diodes.

[0016] In the above technical solution, the alarm output circuit further includes a constant current alarm status display circuit composed of an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a fifth transistor, a sixth transistor, a seventh transistor, and a second LED, and is configured as follows:

[0017] When the fifth transistor is cut off and not conducting, the second LED does not receive voltage and does not emit light for display.

[0018] In the above technical solution, the input control terminal and the alarm output terminal adopt push-button type wiring terminals.

[0019] In the above technical solution, a transparent protective cover is provided on the outer shell.

[0020] Compared with existing technologies, the present invention provides an integrated solid-state relay with monitoring function, comprising a relay housing and a circuit board. The circuit includes: an input control circuit for controlling the input of electrical signals, connected to a power supply through an input control terminal; an output load circuit for controlling the output of electrical signals to the load output terminal, connected to the input control circuit through a first optocoupler and an inductor; and an alarm output circuit for controlling the output of electrical signals to the alarm output terminal, connected to the input control circuit and the output load circuit through a second optocoupler. The input control circuit is equipped with a first LED for displaying the working status, and the alarm output circuit is equipped with a second LED for displaying the alarm status. Thus, when the output load circuit is short-circuited or open-circuited, the alarm output circuit disconnects and alarms, and the input control circuit immediately loses the control signal, causing the first optocoupler to turn off and disconnect the output load circuit. This achieves the functions of protecting the solid-state relay, electrical equipment, and personal safety in the event of main power loss, load loss, relay breakdown, or load output terminal short circuit, issuing an alarm prompt and disconnecting the control circuit. This improves the safety and stability of the relay, and the circuit structure is simple, the response is sensitive and fast, the installation is convenient, and the applicability is strong. Attached Figure Description

[0021] Figure 1 This is a circuit schematic diagram of the integrated solid-state relay with monitoring function in this invention;

[0022] Figure 2 This is a wiring diagram for an independent application of the integrated solid-state relay with monitoring function in this invention;

[0023] Figure 3 This is a wiring diagram of the integrated solid-state relay with monitoring function in series application in this invention;

[0024] Figure 4 This is a schematic diagram of the external appearance of the integrated solid-state relay with monitoring function in this invention;

[0025] Figure 5 This is a structural diagram of the transparent protective cover for the integrated solid-state relay with monitoring function in this invention. Detailed Implementation

[0026] This invention provides an integrated solid-state relay with monitoring capabilities, which can monitor whether the relay is faulty, thereby improving stability and safety. The invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 1 to 5 As shown, the present invention provides an integrated solid-state relay with monitoring function, including a relay housing 1 and a circuit board, the circuit including:

[0028] The input control circuit is used to control the input of electrical signals and is connected to the power supply through the input control terminal.

[0029] The output load circuit is used to control the output of electrical signals to the load output terminal, and is connected to the input control circuit through the first optocoupler U1 and the inductor L1.

[0030] The alarm output circuit is used to control the output of electrical signals to the alarm output terminal. It is connected to the input control circuit and the output load circuit through the second optocoupler U2. The first optocoupler U1 and the second optocoupler U2 are connected in series to trigger the output load circuit. The input control circuit is equipped with a first light-emitting diode LED1 for displaying the working status, and the alarm output circuit is equipped with a second light-emitting diode LED2 for displaying the alarm status.

[0031] In this embodiment, by setting the first optocoupler U1 and the second optocoupler U2 in series to trigger the output load circuit to conduct, and simultaneously feeding back the conduction of the second optocoupler U2 to the alarm output circuit, the alarm circuit can conduct and output. When the output load circuit is short-circuited or open-circuited, the alarm output circuit will disconnect and trigger an alarm. The input control circuit will then lose its control signal and cause the first optocoupler U1 to turn off, thus disconnecting the output load circuit. This achieves the function of issuing an alarm and disconnecting the control circuit in the case of main power loss, load loss, relay breakdown, and load output short circuit, thereby protecting the solid-state relay, electrical equipment, and personal safety, improving the safety and stability of the relay, and the circuit structure is simple, the response is sensitive and fast, the installation is convenient, and the applicability is strong.

[0032] Specifically, when the relay is operating normally, a signal is input to the input control circuit, energizing the first optocoupler U1. This signal, via the second optocoupler U2 in series, triggers the thyristor of the output load circuit, causing the load output circuit to conduct. Simultaneously, the energization of the second optocoupler U2 feeds back to the alarm output circuit, causing it to activate. When the output load circuit is short-circuited or open-circuited, there is no voltage signal at the input of the second optocoupler U2, causing the alarm output circuit to disconnect and trigger an alarm. The input control circuit then loses its control signal, causing the first optocoupler U1 to shut off and disconnecting the output load circuit. When the fault is cleared, the alarm stops and normal operation automatically resumes, achieving the goals of monitoring, control, and protection of user equipment.

[0033] The alarm output circuit can be connected in series with the input line of the input control circuit to enable the solid-state relay to operate normally in a cyclic manner.

[0034] In one embodiment of the present invention, preferably, the input control terminal includes a first positive terminal 5 and a first negative terminal 4, the output load terminal includes a power supply terminal 2 and a load terminal 3, and the alarm output terminal includes a second positive terminal 7 and a second negative terminal 6.

[0035] In one embodiment of the present invention, preferably, in the input control circuit, the first positive terminal 5 is connected to the input terminal of the first optocoupler U1 through the first resistor R1 and the fifth resistor R5, and then through the constant current circuit composed of the first transistor V1, the second transistor V2, the fourth resistor R4, the sixth resistor R6, the fourth capacitor C4, and the fifth capacitor C5 to form a loop to the first negative terminal 4.

[0036] In this embodiment, the input control circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; a first capacitor C1, a second capacitor C2, a fourth capacitor C4, and a fifth capacitor C5; a first light-emitting diode LED1; a first diode D1; a first transistor V1; a second transistor V2; and a first optocoupler U1. When a signal is input to the input control terminal, the voltage at the first positive terminal 5 of the input control terminal passes through the first resistor R1 and the fifth resistor R5 to the input terminal of the first optocoupler U1. Then, through the constant voltage circuit composed of the first transistor V1, the second transistor V2, the fourth resistor R4, the sixth resistor R6, the fourth capacitor C4, and the fifth capacitor C5, a loop is formed at the first negative terminal 4. The first light-emitting diode LED1, the second capacitor C2, and the second resistor R2 form a working status indication circuit. The first diode D1 provides reverse connection protection.

[0037] In one embodiment of the present invention, preferably, the output terminal of the first optocoupler U1 is connected to the inductor L1 and the second optocoupler U2, triggering the first thyristor Q1 and the second thyristor Q2 to connect the output load circuit.

[0038] In one embodiment of the present invention, preferably, the second diode D2 and the third diode D3 are connected in series and then connected in parallel with the load output terminal to form overvoltage protection, and the sixth capacitor C6 and the seventeenth resistor Rx are connected in series to form a buffer absorption circuit and connected in parallel with the load output terminal.

[0039] In one embodiment of the present invention, preferably, the first diode D2 and the third diode D3 are TVS transient suppression diodes.

[0040] In one embodiment of the present invention, preferably, the alarm output circuit further includes a constant current alarm status display circuit composed of an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a fifth transistor V5, a sixth transistor V6, a seventh transistor V7, and a second light-emitting diode LED2, and is configured as follows:

[0041] When the fifth transistor V5 is cut off, the second LED2 does not receive voltage and therefore does not emit light.

[0042] In this embodiment, after the input terminal of the second optocoupler is energized and turned on, the output terminal is immediately turned on. The base of the fourth transistor V4 is at a high level, and the fourth transistor V4 and the fifth transistor V5 are cut off. The base of the third transistor V3 is at a high level, and the third transistor V3 is immediately turned on. The alarm output is connected in series in the input control circuit. When the input control circuit receives a signal, the solid-state relay operates normally.

[0043] When the main power supply to the load is lost, the load is lost, the thyristor breaks down, or the load output is short-circuited, the input of the second optocoupler U2 will not receive a feedback signal and the output will be cut off. At this time, the base of the fourth transistor V4 will be at a low level, and the fourth transistor V4 and the fifth transistor V5 will conduct in succession. The third transistor V3 will be cut off and there will be no alarm output. The input control circuit signal will be cut off, the relay will stop working, and at the same time, the fifth transistor V5 in the alarm circuit will conduct, triggering the second LED2 to light up and indicate the alarm status. When the relay output load returns to normal, the alarm will be automatically cleared.

[0044] In one embodiment of the present invention, preferably, the input control terminal and the alarm output terminal adopt push-button type wiring terminals.

[0045] In this embodiment, by setting the wiring terminals of the input control terminal and the alarm output terminal as push-button terminals, operation time is saved and the work efficiency of electricians is improved in working environments where wiring terminals are frequently installed and removed.

[0046] In one embodiment of the present invention, preferably, a transparent protective cover 8 is provided on the outer shell 1.

[0047] In this embodiment, by providing a transparent protective cover 8 on the outer casing 1, the safety of the relay is improved. At the same time, the transparent structure makes it easy to observe the working status of the relay during use. The transparent protective cover 8 is fastened to the upper surface of the outer casing 1.

[0048] like Figure 1 As shown, an integrated solid-state relay with monitoring function according to the present invention has an input control terminal including a first positive terminal 5 and a first negative terminal 4;

[0049] The input control circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a fourth capacitor C4, a fifth capacitor C5, a first light-emitting diode LED1, a first diode D1, a first transistor V1, a second transistor V2, and a first optocoupler U1.

[0050] The output load circuit includes resistors R7 (seventh resistor), R8 (eighth resistor), R9 (ninth resistor), Rx (seventeenth resistor), L1 (inductor), C6 (sixth capacitor), Q1 (first thyristor), and Q2 (second thyristor).

[0051] The output load terminal includes power supply terminal 2 and load terminal 3;

[0052] The alarm output circuit includes the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16, the seventh capacitor C7, the eighth capacitor C8, the third transistor V3, the fourth transistor V4, the fifth transistor V5, the sixth transistor V6, the seventh transistor V7, the second light-emitting diode LED2, and the second optocoupler U2.

[0053] The alarm output terminal includes the second positive terminal 7 and the second negative terminal 6.

[0054] This invention discloses an integrated solid-state relay with monitoring function, comprising a relay housing and a circuit board. The circuit includes: an input control circuit for controlling electrical signal input, connected to a power supply via an input control terminal; an output load circuit for controlling electrical signal output to a load output terminal, connected to the input control circuit via a first optocoupler and an inductor; and an alarm output circuit for controlling electrical signal output to an alarm output terminal, connected to the input control circuit and the output load circuit via a second optocoupler. The input control circuit is equipped with a first LED for displaying the working status, and the alarm output circuit is equipped with a second LED for displaying the alarm status. Thus, when the output load circuit experiences a short circuit or open circuit, the alarm output circuit disconnects and triggers an alarm. The input control circuit then loses its control signal, causing the first output of the optocoupler to turn off and disconnect the output load circuit. This achieves the functions of protecting the solid-state relay, electrical equipment, and personal safety in the event of main power loss, load loss, relay breakdown, or a short circuit at the load output terminal, issuing an alarm and disconnecting the control circuit. It also improves the safety and stability of the relay, has a simple circuit structure, is highly sensitive and fast-responding, easy to install, and has strong applicability.

[0055] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] This invention is not limited to the above-described preferred embodiments. Anyone should know that any structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention.

Claims

1. An integrated solid-state relay with monitoring function, comprising a relay housing and a circuit board, characterized in that, The circuit includes: The input control circuit is used to control the input of electrical signals and is connected to the power supply through the input control terminal. The output load circuit is used to control the output of electrical signals to the load output terminal, and is connected to the input control circuit through the first optocoupler and the inductor; An alarm output circuit is used to control the output of an electrical signal to the alarm output terminal. It is connected to the input control circuit and the output load circuit through a second optocoupler. The first optocoupler and the second optocoupler are connected in series to trigger the output load circuit. The input control circuit is provided with a first light-emitting diode for displaying the working status, and the alarm output circuit is provided with a second light-emitting diode for displaying the alarm status. The alarm output circuit includes a constant current alarm status display circuit composed of an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a fifth transistor, a sixth transistor, a seventh transistor, and a second LED. The alarm output circuit also includes a third transistor and a fourth transistor, configured such that when the fifth transistor is cut off, the second LED receives no voltage and does not emit light. Specifically, after the input terminal of the second optocoupler is energized and conducts, the output terminal immediately conducts, the base of the fourth transistor is at a high level, the fourth and fifth transistors are cut off, the base of the third transistor is at a high level, and the third transistor... The tube then conducts, and the alarm output is connected in series in the input control circuit. The input control circuit receives a signal, and the solid-state relay operates normally. When the main power supply to the load is lost, the load is lost, the thyristor breaks down, or the load output is short-circuited, the input of the second optocoupler does not receive a feedback signal, and the output is cut off. At this time, the base of the fourth transistor is at a low level, and the fourth and fifth transistors conduct in succession. The third transistor is cut off and there is no alarm output. The input control circuit signal is cut off, and the relay stops working. At the same time, the fifth transistor in the alarm circuit conducts, triggering the second LED to light up and indicate the alarm status. When the relay load output returns to normal, the alarm is automatically cleared. The second and third diodes are connected in series and then in parallel with the load output terminal to form overvoltage protection. The second and third diodes are TVS transient voltage suppressor diodes.

2. The integrated solid-state relay with monitoring function according to claim 1, characterized in that, The input control terminal includes a first positive terminal and a first negative terminal, the load output terminal includes a power supply terminal and a load terminal, and the alarm output terminal includes a second positive terminal and a second negative terminal.

3. An integrated solid-state relay with monitoring function according to claim 2, characterized in that, In the input control circuit, the first positive terminal is connected to the input terminal of the first optocoupler through the first resistor and the fifth resistor, and then through the constant current circuit composed of the first transistor, the second transistor, the fourth resistor, the sixth resistor, the fourth capacitor, and the fifth capacitor to form a loop to the first negative terminal.

4. An integrated solid-state relay with monitoring function according to claim 1, characterized in that, The output terminal of the first optocoupler is connected to the inductor and the second optocoupler, triggering the first and second thyristors to connect the output load circuit.

5. An integrated solid-state relay with monitoring function according to claim 3, characterized in that, The first LED, the second capacitor, and the second resistor form a working status indication circuit, and the first diode is for reverse connection protection.

6. An integrated solid-state relay with monitoring function according to claim 4, characterized in that, The sixth capacitor and the seventeenth resistor are connected in series to form a buffer absorption circuit, which is connected in parallel with the load output terminal.

7. An integrated solid-state relay with monitoring function according to claim 1, characterized in that, The input control terminal and the alarm output terminal adopt push-button type wiring terminals.

8. An integrated solid-state relay with monitoring function according to claim 1, characterized in that, A transparent protective cover is provided on the outer shell.

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