Electrical control system of high-voltage electromagnetic valve

Abstract

The utility model discloses an electrical control system for high-voltage electromagnetic valves, which is used for controlling N paths of high-voltage electromagnetic valves (N is greater than or equal to 1), and is characterized by comprising a main control unit powered by a 24V input power supply, and a network port, a serial port and a CAN (Controller Area Network) port of the main control unit are respectively connected with a 100M network port analysis chip, an RS485 communication chip and an RS485 communication chip; the 24V input power supply supplies power to the N paths of high-voltage electromagnetic valve driving circuits at the same time, and supplies power to the N paths of high-voltage electromagnetic valves through the N paths of high-voltage electromagnetic valve driving circuits; and the N paths of high-voltage electromagnetic valve driving circuits are controlled by the main control unit. The circuit control system disclosed by the utility model can carry out closed-loop control on the high-voltage low electromagnetic valve, carries out information communication and interaction on control and monitoring information and a post-stage master control electric control system, supports modes such as DI pulse control and CAN communication, is efficient and synchronous, and is convenient to expand.

Description

Technical Field

[0001] The utility model relates to an electrical control system for a high-voltage electromagnetic valve. Background Art

[0002] At present, the high-voltage solenoid valve control circuit is mainly realized by an integrated control chip, and the control voltage of the integrated high-voltage solenoid valve control chip (24-72V). The control voltage of some high-voltage solenoid valves is above 100V, so the integrated high-voltage solenoid valve control chip cannot control a high-voltage solenoid valve with a voltage higher than its own controllable voltage. Utility Model Content

[0003] The purpose of the utility model is to make up for the deficiency of the high-voltage field of the integrated high-voltage electromagnetic valve driving chip.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is to provide a high-voltage solenoid valve electrical control system for controlling N-way high-voltage solenoid valves, N≥1, characterized in that it includes a main control unit powered by a 24V input power supply, the network port, serial port, and CAN port of the main control unit are respectively connected to a 100M network port analysis chip, an RS485 communication chip, and an RS485 communication chip, and the 100M network port analysis chip, the RS485 communication chip, and the RS485 communication chip are respectively connected to an external Ethernet network interface, an RS485 communication interface, and a CAN communication interface;

[0005] The 24V input power supply simultaneously powers N high-voltage solenoid valve drive circuits, and powers N high-voltage solenoid valves via the N high-voltage solenoid valve drive circuits; the N high-voltage solenoid valve drive circuits are controlled by the main control unit; the data monitoring ends of the N high-voltage solenoid valves are respectively connected to the input ends of the N monitoring circuits, and each monitoring circuit is respectively connected to the ADC port and IO port of the main control unit via an ADC acquisition circuit and a voltage comparison circuit.

[0006] Preferably, the main control unit adopts an MCU of model STM32M4.

[0007] Preferably, the 24V input power supply supplies power to the main control unit via a DC-DC step-down circuit; the 24V input power supply supplies power to the N high-voltage solenoid valve drive circuits via a DC-DC step-up circuit.

[0008] Preferably, the main control unit controls the N high-voltage solenoid valve drive circuits via N logic safety circuits, wherein the output end of the N logic safety circuits is connected to the control end of the N high-voltage solenoid valve drive circuits, and the control signal input end of each logic safety circuit is connected to the TIM port and GPIO port of the main control unit.

[0009] Preferably, IO port 2 of the main control unit is connected to N digital signal inputs.

[0010] The utility model makes up for the deficiency of the integrated high-voltage solenoid valve driver chip in the high-voltage field, thereby independently developing a high-voltage solenoid valve driver circuit, and the maximum driving voltage can theoretically reach 170V. The actual test of the 110V high-voltage solenoid valve can run stably for a long time. At the same time, the circuit control system disclosed by the utility model can perform closed-loop control of the high-voltage low-voltage solenoid valve, and communicate and interact with the control and monitoring information with the subsequent main control electronic control system, support DI pulse control, CAN communication and other methods, efficient synchronization, and easy expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The utility model discloses a principle block diagram of a high-voltage solenoid valve electrical control system. DETAILED DESCRIPTION

[0012] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0013] like Figure 1 As shown, a high-voltage solenoid valve electrical control system disclosed in an embodiment of the utility model is used to control 4-way high-voltage solenoid valves, and includes an MCU (model STM32M4). The network port of the MCU is connected to a 100M network port resolution chip, and the 100M network port resolution chip is connected to an Ethernet network interface. The serial port of the MCU is connected to an RS485 communication chip, and the RS485 communication chip is connected to an RS485 communication interface. The CAN port of the MCU is connected to a CAN communication chip, and the CAN communication chip is connected to a CAN communication interface. The IO port of the MCU is connected to 4-way digital signal input. The high-voltage solenoid valve control system disclosed in an embodiment of the utility model integrates CAN-BUS, RS485, and Ethernet communication methods, supports simultaneous networking control of multiple electric actuator circuit systems, realizes collaborative work, and provides a feasible solution for large-scale high-voltage solenoid valve control systems.

[0014] A high-voltage solenoid valve electrical control system disclosed in an embodiment of the utility model also includes a 24V input power supply, which supplies power to the MCU via a DC-DC buck circuit (DC-DC Buck Power Supply), and supplies power to 4 high-voltage solenoid valve drive circuits via a DC-DC boost circuit (DC-DC Boost Power Supply), and the 4 high-voltage solenoid valve drive circuits respectively control the 4 high-voltage solenoid valves under the control of the MCU. At the same time, the 24V input power supply supplies power to the 4 high-voltage solenoid valves via the 4 high-voltage solenoid valve drive circuits. The system disclosed in the utility model adopts a general industrial control voltage 24V power supply solution. Through the internal BOOST boost circuit (i.e. the above-mentioned DC-DC boost circuit, DC-DC Boost Power Supply), a 24V-170V adjustable voltage can be achieved.

[0015] In the embodiment of the utility model, the MCU controls 4 high-voltage solenoid valve drive circuits via 4 logic safety circuits, wherein the TIM port and GPIO port of the MCU are respectively connected to the corresponding ports of the 4 logic safety circuits. The data monitoring ends of the 4 high-voltage solenoid valves are respectively connected to the 4 monitoring circuits, and each monitoring circuit is respectively connected to the ADC port and IO port of the MCU via an ADC acquisition circuit and a voltage comparison circuit. In the embodiment of the utility model, the high-voltage solenoid valve drive circuit is a self-developed control circuit, which realizes the control of the high-voltage solenoid valve through 4 power tube switches. A high-side power tube controls the conduction and shutdown of the high-voltage voltage, a high-side power tube controls the conduction and shutdown of the 24V voltage, a low-side power tube controls the charging of the bootstrap capacitor of the bridge circuit, and a low-side power tube controls the conduction and shutdown of the low-side grounding of the high-voltage solenoid valve. In addition, in order to facilitate control, the high-voltage solenoid valve control system disclosed in the utility model also adds a logic conversion unit (i.e., a logic safety circuit), which greatly reduces the complexity of the control of the main control chip (i.e., MCU), prevents the power device from being opened and short-circuited, and reduces the risk of control failure. At the same time, the high-pressure solenoid valve control system disclosed in the utility model integrates 4 monitoring circuits, which can control and monitor the operating status of each high-pressure solenoid valve in real time in cooperation with 4 high-pressure solenoid valve drive circuits. When the conduction current of the high-pressure solenoid valve instantly exceeds the rated current, the monitoring circuit will activate and cut off the signals of all high-pressure solenoid valve control circuits to protect the safe use of the high-pressure solenoid valve.

[0016] The system disclosed in the utility model is controlled by DI pulse, which is convenient, simple and has high real-time performance. Through interrupt triggering, the duration of the high level of the DI pulse is timed, thereby controlling the opening time of the high-pressure solenoid valve. In short, when the DI pulse changes from a low level to a high level, it starts to trigger the high-pressure solenoid valve to open. And it continues to open when the DI pulse is at a high level. When the DI pulse changes from a high level to a low level, it starts to trigger the closing of the high-pressure solenoid valve. The utility model can also exchange signals with the main control debugging controller system through the CAN-BUS communication bus. Of course, the CAN bus can also realize the control of the high-pressure solenoid valve, and then return the state parameters of the high-pressure solenoid valve operation. The system disclosed in the utility model also has RS485 and Ethernet communications, which can also achieve the communication effect of CAN-BUS, providing a flexible communication control solution for this control system.

Claims

1. A high-pressure solenoid valve electrical control system, used to control N high-pressure solenoid valves, N ≥ 1, characterized in that: It includes a main control unit powered by a 24V input power supply, wherein the network port, serial port and CAN port of the main control unit are respectively connected to a 100M network port analysis chip, an RS485 communication chip and an RS485 communication chip, and the 100M network port analysis chip, the RS485 communication chip and the RS485 communication chip are respectively connected to an external Ethernet network interface, an RS485 communication interface and a CAN communication interface; The 24V input power supply simultaneously powers N high-voltage solenoid valve drive circuits, and powers N high-voltage solenoid valves via the N high-voltage solenoid valve drive circuits; the N high-voltage solenoid valve drive circuits are controlled by the main control unit; the data monitoring ends of the N high-voltage solenoid valves are respectively connected to the input ends of the N monitoring circuits, and each monitoring circuit is respectively connected to the ADC port and IO port one of the main control unit via an ADC acquisition circuit and a voltage comparison circuit.

2. A high-voltage solenoid valve electrical control system as claimed in claim 1, characterized in that: The main control unit adopts an MCU of the STM32M4 model.

3. A high-voltage solenoid valve electrical control system as claimed in claim 1, characterized in that: The 24V input power supply supplies power to the main control unit via a DC-DC step-down circuit; the 24V input power supply supplies power to the N-way high-voltage solenoid valve drive circuit via a DC-DC step-up circuit.

4. A high-voltage solenoid valve electrical control system as claimed in claim 1, characterized in that: The main control unit controls the N high-voltage solenoid valve drive circuits via N logic safety circuits, wherein the output end of the N logic safety circuits is connected to the control end of the N high-voltage solenoid valve drive circuits, and the control signal input end of each logic safety circuit is connected to the TIM port and GPIO port of the main control unit.

5. A high-voltage solenoid valve electrical control system as claimed in claim 1, characterized in that: The IO port 2 of the main control unit is connected to N digital signal inputs.

Images