Multi-protection device for electronic switch driving board

Abstract

The utility model relates to a multi-protection device for an electronic switch driving board, which comprises an isolation auxiliary power supply module, a main control circuit module, a relay driving circuit module, a relay state detection circuit module, a temperature detection circuit module and a silicon controlled isolation driving circuit module, one end of the relay driving circuit module is connected with the relay, one end of the relay driving circuit module is connected with the main control circuit module, one end of the relay state monitoring circuit module is connected with the relay, one end of the relay state monitoring circuit module is connected with the main control circuit module, and the temperature detection circuit module is connected with the main control circuit module; and the other end of the silicon-controlled isolation driving circuit module is connected with the main control circuit module. According to the utility model, multiple protection of the electronic switch driving board is realized, the spark phenomenon and fire risk are effectively avoided, the service life of the relay is prolonged, and the safety and reliability of the system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of protection circuits, in particular to a multiple protection device for an electronic switch drive board. Background Art

[0002] At present, conventional electronic switch driver boards are mostly driven by relays, which are prone to sparks and fires, and also shorten the life of the relays. Utility Model Content

[0003] The purpose of the utility model is to provide a multiple protection device for an electronic switch driving board, so as to solve the above problems existing in the current electronic switch driving board.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A multiple protection device for an electronic switch drive board comprises an isolated auxiliary power supply module, a main control circuit module, a relay drive circuit module, a relay state detection circuit module, a temperature detection circuit module and a thyristor isolation drive circuit module. The isolated auxiliary power supply module is connected to the main control circuit module and is used to supply power to the main control circuit module. One end of the relay drive circuit module is connected to a relay and the other end is connected to the main control circuit module. One end of the relay state monitoring circuit module is connected to a relay and the other end is connected to the main control circuit module. The temperature detection circuit module is connected to the main control circuit module. The relay is connected to a load via a thyristor. One end of the thyristor isolation drive circuit module is connected to the thyristor and the other end is connected to the main control circuit module.

[0006] Furthermore, the temperature detection circuit module includes an NTC thermistor attached to a heat sink of the heat-generating drive circuit.

[0007] Furthermore, the relay state monitoring circuit module includes a rectifier diode and a drive optocoupler, one end of the rectifier diode is connected to the normally closed contact of the relay, and the other end is connected to the input end of the drive optocoupler, and the output end of the drive optocoupler is connected to the main control circuit module.

[0008] Furthermore, it also includes an alarm circuit module, which is connected to the main control circuit module.

[0009] Furthermore, the alarm circuit module includes an active integrated buzzer and a triode amplifier circuit, and the active integrated buzzer is connected to the main control circuit module through the triode amplifier circuit.

[0010] Furthermore, it also includes a circuit detection module, which is connected to the main control circuit module and is used to detect the current of the load.

[0011] Furthermore, the circuit detection module includes a current transformer, and the current transformer is connected to the main control circuit module.

[0012] Beneficial effects of the utility model:

[0013] The utility model discloses a multi-protection device for an electronic switch driver board. When the main control circuit module detects that the temperature signal is normal, if a conduction command is received, the relay is controlled to conduct. When the main control circuit module detects that the normally closed signal of the relay is normal, the thyristor isolation drive circuit module is controlled to conduct. When the load current is detected, it indicates that the operation is normal. If the temperature is too high during operation, the thyristor is first turned off. If the current is still detected, the relay is further turned off to achieve the purpose of multiple protection and prevent control from getting out of control. If a disconnect command is received, the thyristor circuit is first disconnected, and then the relay circuit is disconnected, thereby achieving the purpose of spark-free shutdown of the relay, protecting the relay contacts and eliminating fire hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a principle block diagram of the multi-protection device for the electronic switch drive board of the utility model. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0016] This utility model's multi-protection device for an electronic switch driver board includes an isolated auxiliary power supply module, a main control circuit module, a relay driver circuit module, a relay status detection circuit module, a temperature detection circuit module, a thyristor isolation driver circuit module, an alarm circuit module, and a circuit detection module. These modules, through rational connection and coordination, provide multiple protections for the electronic switch driver board, preventing sparks, extending relay life, and improving system safety.

[0017] The isolated auxiliary power supply module is connected to the main control circuit module to provide a stable and isolated power supply for the main control circuit module, ensuring that the main control circuit module is electrically isolated from other circuits, thereby improving the safety and stability of the system.

[0018] The main control circuit module is the core of the entire device. It is responsible for receiving signals from each detection module and controlling the relay drive circuit module and the thyristor isolation drive circuit module according to preset logic. The main control circuit module can be implemented using a single-chip microcomputer or microcontroller, and various protection functions can be implemented through programming.

[0019] The relay drive circuit module is connected to the relay at one end and to the main control circuit module at the other end. This module is used to drive the relay according to the instructions of the main control circuit module.

[0020] The relay status detection circuit module monitors the relay's status in real time and transmits this status signal to the main control circuit module. This module includes a rectifier diode and a driver optocoupler. One end of the rectifier diode is connected to the relay's normally closed contact, and the other end is connected to the input of the driver optocoupler. The output of the driver optocoupler is connected to the main control circuit module. This way, when the relay status changes, the driver optocoupler outputs a corresponding level signal to the main control circuit module.

[0021] The temperature detection circuit module monitors the temperature of the heat sink of the heating drive circuit to prevent overheating and fire. This module includes an NTC thermistor attached to the heat sink. The resistance of the NTC thermistor decreases as temperature rises. The main control circuit module monitors this change in the NTC thermistor's resistance to determine if the temperature is too high and initiate appropriate protective measures.

[0022] The thyristor isolation drive circuit module is used to drive thyristors (SCRs) to control the on / off switching of loads. One end of the module is connected to the SCR, and the other end is connected to the main control circuit module. This isolated drive of the SCR effectively reduces sparking and improves system safety and reliability.

[0023] The alarm circuit module is used to issue an alarm signal when an abnormality is detected. This module includes an active integrated buzzer and a transistor amplifier circuit. The active integrated buzzer is connected to the main control circuit module via the transistor amplifier circuit. When the main control circuit module detects an abnormality, it outputs a control signal to turn on the transistor, thereby driving the buzzer to sound an alarm.

[0024] The circuit detection module detects load current and prevents overcurrent. This module includes a current transformer, which is connected to the main control circuit module. The current transformer senses the load current and transmits a signal to the main control circuit module. Based on this signal, the main control circuit module determines whether the load current is abnormal and takes appropriate protective measures.

[0025] Working principle:

[0026] The 220V power supply enters the common contact of the relay. The normally open contact of the relay is connected to the input terminal of the thyristor, and the output terminal of the thyristor is connected to the output load. When the main control circuit module detects that the temperature signal is normal, if it receives the conduction command, it controls the relay to conduct. When the main control circuit module detects that the normally closed signal of the relay is normal, it controls the thyristor isolation drive circuit module to conduct. If the load is detected to have current, it indicates that the operation is normal. If the temperature is too high during operation, the thyristor is first turned off. If current is detected, the relay is further turned off to achieve the purpose of multiple protection to prevent control loss.

[0027] If a disconnect command is received, the thyristor circuit is disconnected first, and then the relay circuit. The advantage of doing this is that the relay can be shut down without sparks, protecting the relay contacts and eliminating fire hazards.

[0028] If the main control circuit module detects an abnormality in the normally closed signal of the relay after the relay disconnect signal is sent, it will trigger a buzzer alarm indicating a contact failure.

[0029] The electronic switch driver board multiple protection device of the utility model realizes multiple protections for the electronic switch driver board through reasonable module design and coordination, effectively avoids spark phenomenon and fire risk, prolongs the life of the relay, and improves the safety and reliability of the system.

[0030] Obviously, the embodiments described are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art are within the scope of protection of the present invention.

Claims

1. A multi-protection device for an electronic switch driver board, characterized in that: The invention comprises an isolated auxiliary power supply module, a main control circuit module, a relay drive circuit module, a relay state detection circuit module, a temperature detection circuit module and a thyristor isolation drive circuit module. The isolated auxiliary power supply module is connected to the main control circuit module and is used to supply power to the main control circuit module. One end of the relay drive circuit module is connected to the relay and the other end is connected to the main control circuit module. One end of the relay state monitoring circuit module is connected to the relay and the other end is connected to the main control circuit module. The temperature detection circuit module is connected to the main control circuit module. The relay is connected to the load through the thyristor. One end of the thyristor isolation drive circuit module is connected to the thyristor and the other end is connected to the main control circuit module.

2. The electronic switch driver board multi-protection device according to claim 1, characterized in that: The temperature detection circuit module includes an NTC thermistor attached to a heat sink of a heat-generating driving circuit.

3. The electronic switch driver board multi-protection device according to claim 1, characterized in that: The relay state monitoring circuit module includes a rectifier diode and a drive optocoupler, one end of the rectifier diode is connected to the normally closed contact of the relay, and the other end is connected to the input end of the drive optocoupler, and the output end of the drive optocoupler is connected to the main control circuit module.

4. The electronic switch driver board multi-protection device according to claim 1, characterized in that: It also includes an alarm circuit module, which is connected to the main control circuit module.

5. The electronic switch driver board multi-protection device according to claim 4, characterized in that: The alarm circuit module includes an active integrated buzzer and a triode amplifier circuit, and the active integrated buzzer is connected to the main control circuit module through the triode amplifier circuit.

6. The electronic switch driver board multi-protection device according to claim 1, characterized in that: It also includes a circuit detection module, which is connected to the main control circuit module and is used to detect the current of the load.

7. The electronic switch driver board multi-protection device according to claim 6, characterized in that: The circuit detection module includes a current transformer, and the current transformer is connected to the main control circuit module.

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