Solid-state relay on-line monitoring circuit

Abstract

The utility model relates to the technical field of solid-state relays, and provides a solid-state relay on-line monitoring circuit which comprises a wireless communication module, a fault analysis unit, a monitoring unit and a signal conversion circuit, the fault analysis unit is connected with a solid-state relay and sends a driving signal to the solid-state relay, and the input end of the monitoring unit is connected with the solid-state relay. The output end of the monitoring unit is connected with the fault analysis unit through the signal conversion circuit, the fault analysis unit is in communication connection with the terminal equipment through the wireless communication module, and by means of the technical scheme, the problems that in the prior art, relay measurement is low in efficiency and precision, complex in operation and inconvenient in data filing are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of solid-state relays, and in particular to an online monitoring circuit for a solid-state relay. Background Art

[0002] Solid-state relays play an important role in circuits, including automatic control, relay protection, and conversion circuits. Due to their good isolation, simple structure, easy operation, and small-to-large working characteristics, they are widely used in automation control systems, aerospace systems, and nuclear power systems. They are the basic circuit components in my country's industrial development. In the implementation and application of solid-state relays, it is necessary to routinely monitor the use of relays, their performance parameters, and various indicators within a period. Traditional monitoring methods usually use manual handheld instrument contact measurement. Manual contact measurement has the disadvantages of low efficiency, low accuracy, complex operation, and inconvenient data archiving. Traditional monitoring can no longer meet the requirements of high-precision, high-efficiency, and high-automation modern automation industry development. Utility Model Content

[0003] The utility model provides a solid-state relay online monitoring circuit, which solves the problems of low measurement efficiency, low precision, complex operation and inconvenient data archiving for solid-state relays in the prior art.

[0004] The technical solution of the utility model is as follows:

[0005] The solid-state relay online monitoring circuit comprises a wireless communication module, a fault analysis unit, a monitoring unit and a signal conversion circuit. The fault analysis unit is connected to the solid-state relay and sends a driving signal to the solid-state relay. The input end of the monitoring unit is connected to the solid-state relay. The output end of the monitoring unit is connected to the fault analysis unit through the signal conversion circuit. The fault analysis unit is connected to the terminal device through the wireless communication module.

[0006] Furthermore, the solid-state relay in the utility model includes a resistor R71, an optocoupler U11, a resistor R81, a resistor R91, a bidirectional thyristor Q1, a resistor R811 and a capacitor C811. The first input end of the optocoupler U11 is connected in series with the resistor R71 and then connected to the first driving end of the fault analysis unit output. The second input end of the optocoupler U11 is connected to the second driving end of the fault analysis unit. The first output end of the optocoupler U11 is connected to the first end of the bidirectional thyristor Q1 through the resistor R81. The first end of the bidirectional thyristor Q1 is connected to a power supply. The second output end of the optocoupler U11 is connected to the control end of the bidirectional thyristor Q1. The second output end of the optocoupler U11 is connected to the second end of the bidirectional thyristor Q1 through the resistor R91. The second end of the bidirectional thyristor Q1 is used to connect a load. The resistor R811 and the capacitor C811 are connected in series between the first end and the second end of the bidirectional thyristor Q1.

[0007] Further, the monitoring unit in the utility model includes a voltage sampling circuit and a current sampling circuit, and the voltage sampling circuit includes a resistor R14, a resistor R10, a resistor R15, a resistor R24, a resistor R31, a resistor R37, a capacitor C16 and a capacitor C20, a first end of the resistor R14 is connected to the first end of the bidirectional thyristor Q1, a second end of the resistor R14 is connected to the first end of the resistor R15 through the resistor R10, a second end of the resistor R15 is connected to the first end of the resistor R31 through the resistor R24, a first end of the resistor R31 is connected to the first input end of the signal conversion circuit, a second end of the resistor R31 is grounded, the capacitor C16 is connected in parallel at both ends of the resistor R31, a first end of the resistor R37 is connected to the second input end of the signal conversion circuit, a second end of the resistor R37 is grounded, and the capacitor C20 is connected in parallel at both ends of the resistor R37.

[0008] Furthermore, the current sampling circuit in the utility model includes a current sensor U1 and an interface PIN1, the first input end of the current sensor U1 is connected to the first end of the bidirectional thyristor Q1, the second input end of the current sensor U1 is connected to the first input end of the interface PIN1, and the output end of the current sensor U1 is connected to the third input end of the signal conversion circuit.

[0009] Furthermore, the signal conversion circuit in the utility model includes a metering chip U12, an isolator U16 and an isolator U17, the first input end of the isolator U16 and the second input end of the isolator U16 are both connected to the fault analysis unit, the first output end of the isolator U16 is connected to the serial data output end of the metering chip U12, the second output end of the isolator U16 is connected to the serial clock input end of the metering chip U12, the first input end of the isolator U17 is connected to the serial data input end of the metering chip U12, the first output end of the isolator U17 is connected to the fault analysis unit, the second input end of the isolator U17 is connected to the fault analysis unit, and the second output end of the isolator U17 is connected to the selection end of the metering chip U12.

[0010] Furthermore, the monitoring unit in the utility model also includes a temperature monitoring circuit, which includes a temperature sensor J10, a capacitor C2, a capacitor C7 and a resistor R1. The power supply end of the temperature sensor J10 is connected to the VDD power supply, the first end of the capacitor C2 is connected to the VDD power supply, the second end of the capacitor C2 is grounded, the capacitor C7 is connected in parallel to both ends of the capacitor C2, the data end of the temperature sensor J10 is connected to the VDD power supply through the resistor R1, and the data end of the temperature sensor J10 is connected to the fault analysis unit.

[0011] Furthermore, the utility model also includes a power supply module, which includes a rectifier circuit, a filter circuit, a transformer circuit, a voltage regulator U1 and a voltage regulator U3. The input end of the rectifier circuit is connected to the power supply, the output end of the rectifier circuit is connected to the input end of the transformer circuit through the filter circuit, the output of the transformer circuit is connected to the power supply end of the voltage regulator U1 and the voltage regulator U3, and the output end of the voltage regulator U1 and the output end of the voltage regulator U3 output the required voltage.

[0012] The working principle and beneficial effects of the utility model are:

[0013] In the utility model, a driving signal is sent to the solid-state relay through the fault analysis unit to control the on / off state of the solid-state relay. The monitoring unit collects and converts the current and voltage signals at the output end of the solid-state relay and outputs them to the fault analysis unit. The fault analysis unit sends the monitoring data to the monitoring terminal with the help of the wireless communication module. The staff of the monitoring terminal judges whether the working state of the solid-state relay reflected by the signal collected by the monitoring unit is consistent with the state controlled by the driving signal to reflect the performance of the solid-state relay and whether there is a fault problem. Compared with manual monitoring, the utility model improves the problem of high measurement efficiency, simple and reliable solid-state relay and convenient data archiving.

[0014] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a principle block diagram of the utility model;

[0016] Figure 2 This is a circuit diagram of the solid-state relay of the utility model;

[0017] Figure 3 It is a circuit diagram of the voltage sampling circuit of the utility model;

[0018] Figure 4 It is a circuit diagram of the current sampling circuit of the utility model;

[0019] Figure 5 The circuit diagram of the signal conversion circuit of the utility model;

[0020] Figure 6 It is a circuit diagram of the temperature monitoring circuit of the utility model;

[0021] Figure 7 This is a circuit diagram of the power module of the utility model. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0023] like Figure 1 As shown, this embodiment proposes an online monitoring circuit for a solid-state relay, including a wireless communication module, a fault analysis unit, a monitoring unit and a signal conversion circuit. The fault analysis unit is connected to the solid-state relay and sends a driving signal to the solid-state relay. The input end of the monitoring unit is connected to the solid-state relay, and the output end of the monitoring unit is connected to the fault analysis unit through the signal conversion circuit. The fault analysis unit is connected to the terminal device through the wireless communication module.

[0024] Solid-state relays use coils to control the magnet's attraction to make the contacts connect or disconnect. Over time, this can cause poor contact and other faults that can burn out the contactor. Solid-state relays have the advantages of small size, low electromagnetic interference, fast switching speed, and good sensitivity.

[0025] In the utility model, a driving signal is sent to a solid-state relay through a fault analysis unit to control the on / off state of the solid-state relay. The monitoring unit collects and converts the current and voltage signals at the output end of the solid-state relay and outputs them to the fault analysis unit. The fault analysis unit sends the monitoring data to a monitoring terminal with the help of a wireless communication module. The staff of the monitoring terminal reflects the performance of the solid-state relay and whether there is a fault problem by judging whether the working state of the solid-state relay reflected by the signal collected by the monitoring unit is consistent with the state controlled by the driving signal.

[0026] like Figure 2 As shown, in this embodiment, the solid-state relay includes a resistor R71, an optical coupler U11, a resistor R81, a resistor R91, a bidirectional thyristor Q1, a resistor R811 and a capacitor C811. The first input end of the optical coupler U11 is connected in series with the resistor R71 and then connected to the first driving end of the fault analysis unit output. The second input end of the optical coupler U11 is connected to the second driving end of the fault analysis unit. The first output end of the optical coupler U11 is connected to the first end of the bidirectional thyristor Q1 through the resistor R81. The first end of the bidirectional thyristor Q1 is connected to a power supply. The second output end of the optical coupler U11 is connected to the control end of the bidirectional thyristor Q1. The second output end of the optical coupler U11 is connected to the second end of the bidirectional thyristor Q1 through the resistor R91. The second end of the bidirectional thyristor Q1 is used to connect a load. The resistor R811 and the capacitor C811 are connected in series between the first end and the second end of the bidirectional thyristor Q1.

[0027] This embodiment includes three solid-state relays with the same structure. When the solid-state relays are working, the fault analysis unit drives the three solid-state relays to be turned on and off at the same time. Figure 2 As shown, the processor U8 is used as the core of the fault analysis unit. In this embodiment, the HC32F460JETA-LQFP48 chip is used as the processor of the fault analysis unit, wherein the PC14 terminal of the HC32F460JETA-LQFP48 sends a first drive signal to the first input terminal of the optocoupler U11 through the resistor R71, and the PC15 terminal sends a second drive signal to the second input terminal of the optocoupler U11. The second drive signal of the second input terminal of the optocoupler U11 should be kept at a low level or in a suspended state. The single-phase conductivity of the input end of U11, when the first control drive signal of the fault analysis unit is at a low level, the optocoupler U11 is not turned on, and the bidirectional thyristor Q1 does not act. When the first control drive signal of the fault analysis unit is at a high level, the optocoupler U11 is turned on, and the control electrode of the bidirectional thyristor Q1 becomes high level and turned on. At the same time, the bidirectional thyristor Q1 can play a role in voltage regulation. The resistor R811 and the capacitor C811 form a filter circuit to make the output voltage more stable. The resistors R71, R81 and R91 have a current limiting function.

[0028] The working principle of the branch where the optocoupler U12 and the optocoupler U13 are located is the same as that of the optocoupler U11 branch, and the working principle of the branch where the optocoupler U12 and the optocoupler U13 are located will not be repeated here.

[0029] like Figure 3 As shown, in this embodiment, the monitoring unit includes a voltage sampling circuit and a current sampling circuit. The voltage sampling circuit includes a resistor R14, a resistor R10, a resistor R15, a resistor R24, a resistor R31, a resistor R37, a capacitor C16 and a capacitor C20. The first end of the resistor R14 is connected to the first end of the bidirectional thyristor Q1, the second end of the resistor R14 is connected to the first end of the resistor R15 through the resistor R10, the second end of the resistor R15 is connected to the first end of the resistor R31 through the resistor R24, the first end of the resistor R31 is connected to the first input end of the signal conversion circuit, the second end of the resistor R31 is grounded, the capacitor C16 is connected in parallel to both ends of the resistor R31, the first end of the resistor R37 is connected to the second input end of the signal conversion circuit, the second end of the resistor R37 is grounded, and the capacitor C20 is connected in parallel to both ends of the resistor R37.

[0030] The monitoring unit is used to monitor whether the solid-state relay is unstable during operation, wherein the voltage sampling circuit is used to collect whether the voltage of the solid-state relay is normal during operation, and the voltage sampling circuit includes three branches with the same circuit structure. The current sampling circuit is used to monitor the current flowing through the solid-state relay, so as to determine whether the solid-state relay is operating normally, and the current sampling circuit includes four branches with the same circuit structure.

[0031] The three-way voltage sampling circuit corresponds to the output of the three-way thyristor control circuit in the solid-state relay. In any voltage sampling branch, resistors R14, R10, R15, R24 and R31 form a voltage divider circuit. Resistor R31 is a sampling resistor. Resistor R14, R10, R15 and R24 are connected in series to play a role in current limiting. The sampled voltage signal is sent to the signal conversion circuit.

[0032] like Figure 4 As shown, the current sampling circuit in this embodiment includes a current sensor U1 and an interface PIN1, the first input end of the current sensor U1 is connected to the first end of the bidirectional thyristor Q1, the second input end of the current sensor U1 is connected to the first input end of the interface PIN1, and the output end of the current sensor U1 is connected to the third input end of the signal conversion circuit.

[0033] The three current sampling circuits correspond to the outputs of the three thyristor control circuits in the solid-state relay respectively, and the other current sampling is used as a reference. Any current sampling branch includes a current sensor U1, which is used to monitor the current size when the solid-state relay is running, and convert the monitored large current into a small current signal and send it to the signal conversion circuit.

[0034] like Figure 5 As shown, the signal conversion circuit in this embodiment includes a metering chip U12, an isolator U16 and an isolator U17. The first input end of the isolator U16 and the second input end of the isolator U16 are both connected to the fault analysis unit, the first output end of the isolator U16 is connected to the serial data output end of the metering chip U12, the second output end of the isolator U16 is connected to the serial clock input end of the metering chip U12, the first input end of the isolator U17 is connected to the serial data input end of the metering chip U12, the first output end of the isolator U17 is connected to the fault analysis unit, the second input end of the isolator U17 is connected to the fault analysis unit, and the second output end of the isolator U17 is connected to the selection end of the metering chip U12.

[0035] The signal conversion circuit is used to send the monitored voltage and current signals to the fault analysis unit. The signal conversion circuit is composed of a metering chip U12. The metering chip U12 can be applied to three-phase three-wire and three-phase four-wire systems. In this embodiment, it is a three-phase four-wire system. The isolator U16 and the isolator U17 play a role in signal isolation. The signals between the fault analysis unit and the metering chip U12 interfere with each other.

[0036] like Figure 6 As shown, in this embodiment, the monitoring unit also includes a temperature monitoring circuit, which includes a temperature sensor J10, a capacitor C2, a capacitor C7 and a resistor R1. The power supply end of the temperature sensor J10 is connected to the VDD power supply, the first end of the capacitor C2 is connected to the VDD power supply, the second end of the capacitor C2 is grounded, the capacitor C7 is connected in parallel to both ends of the capacitor C2, the data end of the temperature sensor J10 is connected to the VDD power supply through the resistor R1, and the data end of the temperature sensor J10 is connected to the fault analysis unit.

[0037] Due to power consumption, when the solid-state relay is working for a long time, the internal components will heat up due to the long working time. If this continues for a long time, it is easy to damage the entire circuit. Therefore, the temperature of the solid-state relay is monitored, and the temperature of the solid-state relay is obtained through the temperature sensor J10. In this embodiment, 18B20 is used as the temperature sensor. Since the temperature sensor 18B20 does not require complex peripheral circuits, the temperature signal can be directly converted into an electrical signal and sent to the fault analysis unit. The resistor R10 is a current limiting resistor, and the capacitors C2 and C7 are filter capacitors.

[0038] like Figure 7As shown, this embodiment also includes a power module, which includes a rectifier circuit, a filter circuit, a transformer circuit, a voltage regulator U1 and a voltage regulator U3. The input end of the rectifier circuit is connected to the power supply, the output end of the rectifier circuit is connected to the input end of the transformer circuit through the filter circuit, the output of the transformer circuit is connected to the power supply end of the voltage regulator U1 and the voltage regulator U3, and the output end of the voltage regulator U1 and the output end of the voltage regulator U3 output the required voltage.

[0039] In the power module, the rectifier circuit full-wave rectifies the AC power of the power supply, filters the rectified voltage through the filter circuit, and finally converts the filtered voltage into a 12V DC voltage through the transformer circuit to power the voltage regulator U1 and the voltage regulator U3, and then the voltage regulator U1 and the voltage regulator U3 output a suitable voltage to power other circuits.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Solid-state relay online monitoring circuit, characterized in that, It includes a wireless communication module, a fault analysis unit, a monitoring unit and a signal conversion circuit. The fault analysis unit is connected to a solid-state relay and sends a driving signal to the solid-state relay. The input end of the monitoring unit is connected to the solid-state relay, and the output end of the monitoring unit is connected to the fault analysis unit through the signal conversion circuit. The fault analysis unit is connected to the terminal device through the wireless communication module.

2. The solid-state relay online monitoring circuit according to claim 1, characterized in that: The solid-state relay includes a resistor R71, an optical coupler U11, a resistor R81, a resistor R91, a bidirectional thyristor Q1, a resistor R811 and a capacitor C811. The first input end of the optical coupler U11 is connected in series with the resistor R71 and then connected to the first driving end output by the fault analysis unit. The second input end of the optical coupler U11 is connected to the second driving end of the fault analysis unit. The first output end of the optical coupler U11 is connected to the first end of the bidirectional thyristor Q1 through the resistor R81. The first end of the bidirectional thyristor Q1 is connected to a power supply. The second output end of the optical coupler U11 is connected to the control end of the bidirectional thyristor Q1. The second output end of the optical coupler U11 is connected to the second end of the bidirectional thyristor Q1 through the resistor R91. The second end of the bidirectional thyristor Q1 is used to connect a load. The resistor R811 and the capacitor C811 are connected in series between the first end and the second end of the bidirectional thyristor Q1.

3. The solid-state relay online monitoring circuit according to claim 2, characterized in that: The monitoring unit includes a voltage sampling circuit and a current sampling circuit. The voltage sampling circuit includes a resistor R14, a resistor R10, a resistor R15, a resistor R24, a resistor R31, a resistor R37, a capacitor C16 and a capacitor C20. The first end of the resistor R14 is connected to the first end of the bidirectional thyristor Q1, the second end of the resistor R14 is connected to the first end of the resistor R15 through the resistor R10, the second end of the resistor R15 is connected to the first end of the resistor R31 through the resistor R24, the first end of the resistor R31 is connected to the first input end of the signal conversion circuit, the second end of the resistor R31 is grounded, the capacitor C16 is connected in parallel across the resistor R31, the first end of the resistor R37 is connected to the second input end of the signal conversion circuit, the second end of the resistor R37 is grounded, and the capacitor C20 is connected in parallel across the resistor R37.

4. The solid-state relay online monitoring circuit according to claim 3, characterized in that: The current sampling circuit includes a current sensor U1 and an interface PIN1, wherein the first input end of the current sensor U1 is connected to the first end of the bidirectional thyristor Q1, the second input end of the current sensor U1 is connected to the first input end of the interface PIN1, and the output end of the current sensor U1 is connected to the third input end of the signal conversion circuit.

5. The solid-state relay online monitoring circuit according to claim 3, characterized in that: The signal conversion circuit includes a metering chip U12, an isolator U16 and an isolator U17. The first input end and the second input end of the isolator U16 are both connected to the fault analysis unit. The first output end of the isolator U16 is connected to the serial data output end of the metering chip U12. The second output end of the isolator U16 is connected to the serial clock input end of the metering chip U12. The first input end of the isolator U17 is connected to the serial data input end of the metering chip U12. The first output end of the isolator U17 is connected to the fault analysis unit. The second input end of the isolator U17 is connected to the fault analysis unit. The second output end of the isolator U17 is connected to the selection end of the metering chip U12.

6. The solid-state relay online monitoring circuit according to claim 1, characterized in that: The monitoring unit also includes a temperature monitoring circuit, which includes a temperature sensor J10, a capacitor C2, a capacitor C7 and a resistor R1. The power supply end of the temperature sensor J10 is connected to the VDD power supply, the first end of the capacitor C2 is connected to the VDD power supply, the second end of the capacitor C2 is grounded, the capacitor C7 is connected in parallel to both ends of the capacitor C2, the data end of the temperature sensor J10 is connected to the VDD power supply through the resistor R1, and the data end of the temperature sensor J10 is connected to the fault analysis unit.

7. The solid-state relay online monitoring circuit according to claim 1, characterized in that: It also includes a power supply module, which includes a rectifier circuit, a filter circuit, a transformer circuit, a voltage regulator U1 and a voltage regulator U3. The input end of the rectifier circuit is connected to the power supply, the output end of the rectifier circuit is connected to the input end of the transformer circuit through the filter circuit, the output of the transformer circuit is connected to the power supply end of the voltage regulator U1 and the voltage regulator U3, and the output end of the voltage regulator U1 and the output end of the voltage regulator U3 output the required voltage.

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