Isolation control circuit

Abstract

The utility model relates to the field of control circuits, in particular to an isolation control circuit. According to the scheme, the device comprises a controller, a photoelectric coupler module, a driving module, a relay module and a first connector, a first pin of a first photoelectric coupler is connected with the controller through a first resistor, a second pin of the first photoelectric coupler is grounded, a third pin of the first photoelectric coupler is connected with a 24V power supply, and a fourth pin of the first photoelectric coupler is connected with a first pin of a driving chip through a second resistor; a sixteenth pin of the driving chip is connected with a second pin of the first relay, a first pin of the driving chip is connected with a 24V power supply, a third pin of the driving chip is connected with a fourth pin of the relay through a third resistor and a first capacitor, and a first bidirectional transient voltage suppression diode is connected between the third pin and the fourth pin of the first relay; and the fourth pin of the first relay (REL300) is also connected with the second pin of the first connector. The electromagnetic valve control circuit is suitable for electromagnetic valve control of various automation devices, the circuit is simplified, and the reliability and the safety of the electromagnetic valve control circuit of the automation devices are improved.

Description

Technical Field

[0001] The utility model relates to the field of control circuits, and particularly relates to an isolation control circuit. Background Art

[0002] The solenoid valve control circuit of an automated device usually includes a microprocessor, a programmable logic controller, a drive circuit, a sensor input, and a user interface. These components work together to achieve precise control of the valve, thus ensuring the safe and accurate operation of the automated device. The control circuit monitors key parameters such as gas pressure, temperature, and flow rate in real time, and implements an emergency shutdown in case of anomalies to protect the safety of the system and operators.

[0003] However, the current control circuit has the following disadvantages:

[0004] The existing control circuit design may be very complex, involving multiple components and levels, which may lead to difficulties in system integration and maintenance, and increase the total cost of the system.

[0005] Due to electrical interference and electromagnetic interference, the reliability and stability of the entire automated process are affected. Summary of the Utility Model

[0006] The purpose of the utility model is to overcome the shortcomings of the prior art, and provide an isolation control circuit, which simplifies the circuit and improves the reliability and safety of the solenoid valve control circuit of an automated device.

[0007] The utility model adopts the following technical solutions to achieve the above purpose. The utility model provides an isolation control circuit, which includes a controller, an optocoupler module, a drive module, a relay module, and a first connector CON12. The optocoupler module includes a first optocoupler U300A, a first resistor R300, and a second resistor R301. The drive module is a drive chip U310. The relay module includes a first relay REL300, a first bidirectional transient voltage suppression diode T330, a third resistor R330, and a first capacitor C330;

[0008] The first pin of the first optocoupler U300A is connected to the controller through the first resistor R300. The second pin of the first optocoupler U300A is grounded. The third pin is connected to a 24V power supply. The fourth pin is connected to the first pin of the driver chip U310 through the second resistor R301. The sixteenth pin of the driver chip U310 is connected to the second pin of the first relay REL300. The first pin of the first relay REL300 is connected to the 24V power supply. The third pin of the first relay REL300 is connected to the fourth pin of the relay REL300 through the third resistor R330 and the first capacitor C330. The first bidirectional transient voltage suppression diode T330 is connected between the third pin and the fourth pin of the first relay REL300. The fourth pin of the first relay REL300 is also connected to the second pin of the first connector CON12.

[0009] Furthermore, the optocoupler module further includes a second optocoupler U300B, a fourth resistor R302, and a fifth resistor R303. The relay module further includes a second relay REL301, a sixth resistor R331, a second capacitor C331, and a second bidirectional transient voltage suppression diode T331. The first pin of the second optocoupler U300B is connected to the controller through the fourth resistor R302. The second pin of the second optocoupler U300B is grounded. The third pin of the second optocoupler U300B is connected to the 24V power supply. The fourth pin of the second optocoupler U300B is connected to the second pin of the driver chip U310 through the fifth resistor R303. The fifteenth pin of the driver chip U310 is connected to the second pin of the second relay REL301. The first pin of the second relay REL301 is connected to the 24V power supply. The third pin of the second relay REL301 is connected to the fourth pin of the second relay REL301 through the sixth resistor R331 and the second capacitor C331. The second bidirectional transient voltage suppression diode T331 is connected between the third pin and the fourth pin of the second relay REL301. The fourth pin of the second relay REL301 is also connected to the third pin of the first connector CON12.

[0010] Further, the opto-coupler module further includes a third opto-coupler U300C, a seventh resistor R304, and an eighth resistor R305. The relay module further includes a third relay REL302, a ninth resistor R332, a third capacitor C332, and a third bidirectional transient voltage suppressor diode T332. The first pin of the third opto-coupler U300C is connected to the controller through the seventh resistor R304. The second pin of the third opto-coupler U300C is grounded. The third pin of the third opto-coupler U300C is connected to a 24V power supply. The fourth pin of the third opto-coupler U300C is connected to the third pin of the driver chip U310 through the eighth resistor R305. The fourteenth pin of the driver chip U310 is connected to the second pin of the third relay REL302. The third relay REL302 is connected to a 24V power supply. The third pin of the third relay REL302 is connected to the fourth pin of the third relay REL302 through the ninth resistor R332 and the third capacitor C332. The third bidirectional transient voltage suppressor diode T332 is connected between the third pin and the fourth pin of the third relay REL302. The fourth pin of the third relay REL302 is further connected to the fifth pin of the first connector CON12.

[0011] Further, the models of the first opto-coupler U300A, the second opto-coupler U300B, and the third opto-coupler U300C are ELQ3H7.

[0012] Further, the model of the driver chip U310 is ULQ2003A.

[0013] Further, the models of the first relay REL300, the second relay REL301, and the third relay REL302 are HF46F / 24-HS1.

[0014] Further, the models of the first bidirectional transient voltage suppressor diode T330, the second bidirectional transient voltage suppressor diode T331, and the third bidirectional transient voltage suppressor diode T332 are SMBJ24CA.

[0015] Advantages of the present utility model:

[0016] The utility model realizes the electrical isolation between the controller and the relay through the first optocoupler U300A, the second optocoupler U300B and the third optocoupler U300C, improving the safety and reliability of the circuit; through the U310 drive chip, the driving ability of the circuit is improved; through the power amplification of the first relay REL300, the second relay REL301 and the third relay REL302, and through the first bidirectional transient voltage suppression diode T330, the second bidirectional transient voltage suppression diode T331 and the third bidirectional transient voltage suppression diode T332 to protect the circuit, the stability and on-site adaptability of the circuit are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a block diagram of an isolation control circuit structure provided by an embodiment of the utility model;

[0018] Figure 2 is a schematic diagram of the controller circuit structure provided by an embodiment of the utility model;

[0019] Figure 3 is a schematic diagram of the optocoupler module circuit structure provided by an embodiment of the utility model;

[0020] Figure 4 is a schematic diagram of the drive chip circuit structure provided by an embodiment of the utility model;

[0021] Figure 5 is a schematic diagram of the relay module circuit structure provided by an embodiment of the utility model;

[0022] Figure 6 is a schematic diagram of the circuit structure of the first connector provided by an embodiment of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the objectives, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the utility model.

[0024] The utility model provides an isolation control circuit, as Figure 1 shown, which includes a controller, an optocoupler module, a drive module, a relay module and a first connector CON12.

[0025] As Figure 2As shown, the model of the controller is GD32F450. GD32F450 has extremely high computing performance. The maximum main frequency of the processor can reach 200MHz, and it provides a complete DSP instruction set, parallel computing ability and a dedicated floating-point unit FPU, thus integrating 32-bit control with leading digital signal processing technology to meet advanced computing requirements. Executing code directly in the flash has zero wait states. GD32F450 is equipped with 512KB to 3072KB of on-chip Flash and 256KB to 512KB of SRAM. The dual-bank flash allows synchronous read and write operations, which facilitates safe program upgrades without affecting application performance while updating the software.

[0026] Reference Figures 3 to 6 , the specific structure of the present utility model is as follows:

[0027] The first pin of the first optocoupler U300A is connected to the controller through the first resistor R300. The second pin of the first optocoupler U300A is grounded. The third pin is connected to the 24V power supply. The fourth pin is connected to the first pin of the driver chip U310 through the second resistor R301. The sixteenth pin of the driver chip U310 is connected to the second pin of the first relay REL300. The first pin of the first relay REL300 is connected to the 24V power supply. The third pin of the first relay REL300 is connected to the fourth pin of the relay REL300 through the third resistor R330 and the first capacitor C330. The first bidirectional transient voltage suppression diode T330 is connected between the third pin and the fourth pin of the first relay REL300. The fourth pin of the first relay REL300 is also connected to the second pin of the first connector CON12.

[0028] The first pin of the second optocoupler U300B is connected to the controller through the fourth resistor R302. The second pin of the second optocoupler U300B is grounded. The third pin of the second optocoupler U300B is connected to the 24V power supply. The fourth pin of the second optocoupler U300B is connected to the second pin of the driver chip U310 through the fifth resistor R303. The fifteenth pin of the driver chip U310 is connected to the second pin of the second relay REL301. The first pin of the second relay REL301 is connected to the 24V power supply. The third pin of the second relay REL301 is connected to the fourth pin of the second relay REL301 through the sixth resistor R331 and the second capacitor C331. The second bidirectional transient voltage suppression diode T331 is connected between the third pin and the fourth pin of the second relay REL301. The fourth pin of the second relay REL301 is also connected to the third pin of the first connector CON12.

[0029] The first pin of the third optocoupler U300C is connected to the controller through the seventh resistor R304. The second pin of the third optocoupler U300C is grounded. The third pin of the third optocoupler U300C is connected to the 24V power supply. The fourth pin of the third optocoupler U300C is connected to the third pin of the drive chip U310 through the eighth resistor R305. The fourteenth pin of the drive chip U310 is connected to the second pin of the third relay REL302. The first pin of the third relay REL302 is connected to the 24V power supply. The third pin of the third relay REL302 is connected to the fourth pin of the third relay REL302 through the ninth resistor R332 and the third capacitor C332. The third bidirectional transient voltage suppressor diode T332 is connected between the third pin and the fourth pin of the third relay REL302. The fourth pin of the third relay REL302 is also connected to the fifth pin of the first connector CON12.

[0030] The first pin of the optocoupler U301A is connected to the controller through the resistor R306. The second pin of the optocoupler U301A is grounded. The third pin of the optocoupler U301A is connected to the 24V power supply. The fourth pin of the optocoupler U301A is connected to the fourth pin of the drive chip U310 through the resistor R307. The thirteenth pin of the drive chip U310 is connected to the second pin of the relay REL303. The first pin of the relay REL303 is connected to the 24V power supply. The third pin of the relay REL303 is connected to the fourth pin of the relay REL303 through the resistor R333 and the capacitor C333. The bidirectional transient voltage suppressor diode T333 is connected between the third pin and the fourth pin of the relay REL303. The fourth pin of the relay REL303 is also connected to the sixth pin of the first connector CON12.

[0031] The first pin of the optocoupler U301B is connected to the controller through the resistor R308. The second pin of the optocoupler U301B is grounded. The third pin of the optocoupler U301B is connected to the 24V power supply. The fourth pin of the optocoupler U301B is connected to the fifth pin of the drive chip U310 through the resistor R309. The twelfth pin of the drive chip U310 is connected to the second pin of the relay REL304. The first pin of the relay REL304 is connected to the 24V power supply. The third pin of the relay REL304 is connected to the fourth pin of the relay REL304 through the resistor R334 and the capacitor C334. The bidirectional transient voltage suppressor diode T334 is connected between the third pin and the fourth pin of the relay REL304. The fourth pin of the relay REL304 is also connected to the eighth pin of the first connector CON12.

[0032] The first pin of the optocoupler U301C is connected to the controller through the resistor R310. The second pin of the optocoupler U301C is grounded. The third pin of the optocoupler U301C is connected to the 24V power supply. The fourth pin of the optocoupler U301C is connected to the sixth pin of the driver chip U310 through the resistor R311. The eleventh pin of the driver chip U310 is connected to the second pin of the relay REL305. The first pin of the relay REL305 is connected to the 24V power supply. The third pin of the relay REL305 is connected to the fourth pin of the relay REL305 through the resistor R335 and the capacitor C335. The bidirectional transient voltage suppression diode T335 is connected between the third pin and the fourth pin of the relay REL305. The fourth pin of the relay REL305 is also connected to the ninth pin of the first connector CON12.

[0033] In the present utility model, the first pin of U300A, U300B, U300C, U301A, U301B, and U301C is the anode of the light-emitting diode of the light-emitting end, the second pin is the cathode of the light-emitting diode of the light-emitting end, the third pin is the collector of the light-receiving triode, and the fourth pin is the emitter of the light-receiving triode.

[0034] Specifically, the models of the first optocoupler U300A, the second optocoupler U300B, and the third optocoupler U300C are ELQ3H7. The optocoupler realizes the photoelectric conversion of electrical signals through the photoelectric effect and uses light as a medium to transmit electrical signals, thereby achieving the photoelectric isolation of the input and output circuits and effectively suppressing the transmission of interference signals. The present utility model selects ELQ3H7 as the optocoupler, which has the advantages of high isolation degree, low coupling capacitance, and low leakage current, and is suitable for signal transmission and control systems that require high precision and high stability, thus greatly expanding the application scenarios of the present utility model.

[0035] Specifically, the model of the driver chip U310 is ULQ2003A. The control signal output by the optocoupler is too small in current to directly drive the subsequent relay. Using this driver chip can amplify the small current signal after photoelectric conversion, thereby realizing the drive of the relay. ULQ2003A is a high-voltage, large-current Darlington transistor array that can output a relatively large drive current. At the same time, the chip also has a common cathode clamping diode for switching inductive loads and can be applicable to various application scenarios that require high voltage and large current.

[0036] Specifically, the models of the first relay REL300, the second relay REL301, and the third relay REL302 are HF46F / 24-HS1. A relay can control a large current in another controlled circuit through a small current in the control circuit. Since the solenoid valve requires a relatively large current (power) to operate and cannot be driven by the output signal of the controller, three relays are needed to amplify the power of the controller's output signal. The selected HF46F series relays in this design support multiple rated voltages and rated current levels, have strong contact load capabilities, and support multiple channel specifications, which can well meet the driving requirements of solenoid valves of different specifications and improve the on-site adaptability.

[0037] Specifically, the models of the first bidirectional transient voltage suppression diode T330, the second bidirectional transient voltage suppression diode T331, and the third bidirectional transient voltage suppression diode T332 are SMBJ24CA. The bidirectional transient suppression diode mainly realizes bidirectional overvoltage protection, that is, overvoltage protection for both positive and negative voltages, and can protect electrical equipment from being damaged by positive and negative voltage spikes introduced by wires. When its two poles are subjected to a transient high-energy impact, it can change the high impedance between the two poles to a low impedance at the nanosecond level, absorb the surge power at the same time, and clamp the voltage between the two poles to a safe value, thus effectively protecting the subsequent circuit devices from being damaged by surge pulses. Through the above three bidirectional transient suppression diodes, surge protection for the relay coil is achieved, thereby ensuring the reliable operation of the control circuit in a harsh industrial field environment.

[0038] The working principle of the present utility model:

[0039] The controller runs a pre-set control program and outputs high and low level control signals from the corresponding pins. The output high and low level signals are first subjected to optoelectronic conversion through the optocoupler module to achieve electrical isolation between the front-end low-power control signal and the back-end high-power circuit, so as to protect the controller from being interfered with and damaged by the high-power circuit.

[0040] The control signal output through the optocoupler is still relatively weak in signal strength. After being amplified in power by the drive module, it drives the relay module to act, realizes the on and off of the relay contacts, and connects the relay contacts to the first connector CON12, then various types of solenoid valves can be externally connected.

[0041] Through the above signal link, the function of outputting high and low level control signals from the controller to control the on and off of various types of solenoid valves on site is realized.

[0042] The above are only the preferred embodiments of the present utility model. It should be understood that the present utility model is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in related fields. Any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present utility model shall fall within the protection scope of the appended claims of the present utility model.

Claims

1. An isolation control circuit, characterized in that, It includes a controller, an opto-coupler module, a drive module, a relay module, and a first connector (CON12). The opto-coupler module includes a first opto-coupler (U300A), a first resistor (R300), and a second resistor (R301). The drive module is a drive chip (U310). The relay module includes a first relay (REL300), a first bidirectional transient voltage suppression diode (T330), a third resistor (R330), and a first capacitor (C330). The first pin of the first opto-coupler (U300A) is connected to the controller through the first resistor (R300). The second pin of the first opto-coupler (U300A) is grounded. The third pin is connected to a 24V power supply. The fourth pin is connected to the first pin of the drive chip (U310) through the second resistor (R301). The sixteenth pin of the drive chip (U310) is connected to the second pin of the first relay (REL300). The first pin of the first relay (REL300) is connected to the 24V power supply. The third pin of the first relay (REL300) is connected to the fourth pin of the relay (REL300) through the third resistor (R330) and the first capacitor (C330). The first bidirectional transient voltage suppression diode (T330) is connected between the third pin and the fourth pin of the first relay (REL300). The fourth pin of the first relay (REL300) is also connected to the second pin of the first connector (CON12).

2. The isolation control circuit according to claim 1, wherein The opto-coupler module further includes a second opto-coupler (U300B), a fourth resistor (R302), and a fifth resistor (R303). The relay module further includes a second relay (REL301), a sixth resistor (R331), a second capacitor (C331), and a second bidirectional transient voltage suppression diode (T331). The first pin of the second opto-coupler (U300B) is connected to the controller through the fourth resistor (R302). The second pin of the second opto-coupler (U300B) is grounded. The third pin of the second opto-coupler (U300B) is connected to the 24V power supply. The fourth pin of the second opto-coupler (U300B) is connected to the second pin of the drive chip (U310) through the fifth resistor (R303). The fifteenth pin of the drive chip (U310) is connected to the second pin of the second relay (REL301). The first pin of the second relay (REL301) is connected to the 24V power supply. The third pin of the second relay (REL301) is connected to the fourth pin of the second relay (REL301) through the sixth resistor (R331) and the second capacitor (C331). The second bidirectional transient voltage suppression diode (T331) is connected between the third pin and the fourth pin of the second relay (REL301). The fourth pin of the second relay (REL301) is also connected to the third pin of the first connector (CON12).

3. The isolation control circuit according to claim 2, wherein, The opto-coupler module further includes a third opto-coupler (U300C), a seventh resistor (R304), and an eighth resistor (R305). The relay module further includes a third relay (REL302), a ninth resistor (R332), a third capacitor (C332), and a third bidirectional transient voltage suppression diode (T332). The first pin of the third opto-coupler (U300C) is connected to the controller through the seventh resistor (R304). The second pin of the third opto-coupler (U300C) is grounded. The third pin of the third opto-coupler (U300C) is connected to a 24V power supply. The fourth pin of the third opto-coupler (U300C) is connected to the third pin of the drive chip (U310) through the eighth resistor (R305). The fourteenth pin of the drive chip (U310) is connected to the second pin of the third relay (REL302). The first pin of the third relay (REL302) is connected to a 24V power supply. The third pin of the third relay (REL302) is connected to the fourth pin of the third relay (REL302) through the ninth resistor (R332) and the third capacitor (C332). The third bidirectional transient voltage suppression diode (T332) is connected between the third pin and the fourth pin of the third relay (REL302). The fourth pin of the third relay (REL302) is further connected to the fifth pin of the first connector (CON12).

4. The isolation control circuit according to claim 3, wherein The models of the first opto-coupler (U300A), the second opto-coupler (U300B), and the third opto-coupler (U300C) are ELQ3H7.

5. The isolation control circuit according to claim 3, characterized in that The models of the first relay (REL300), the second relay (REL301), and the third relay (REL302) are HF46F / 24-HS1.

6. The isolation control circuit according to claim 3, wherein The models of the first bidirectional transient voltage suppression diode (T330), the second bidirectional transient voltage suppression diode (T331), and the third bidirectional transient voltage suppression diode (T332) are SMBJ24CA.

7. The isolation control circuit according to claim 1, wherein The model of the drive chip (U310) is ULQ2003A.

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