High-pressure opening low-pressure holding valve driving circuit based on monostable trigger

Abstract

The invention relates to the technical field of valve driving, in particular to a high-pressure opening and low-pressure maintaining valve driving circuit based on a monostable trigger, which comprises a monostable trigger output module and a valve driving module, and the output end of the monostable trigger output module is connected with the input end of the valve driving module. The monostable trigger output module inputs the high-level control signal into the valve driving module to drive the electromagnetic valve, the monostable trigger output module is used for generating the high-level control signal with a fixed time length, and the valve driving module is used for driving the electromagnetic valve; through general electronic devices, the high-voltage opening time can be controlled, it is guaranteed that the electromagnetic valve is opened stably and kept in an opening state under low voltage, the problem that the electromagnetic valve is in a high-voltage closing state for a long time, power consumption is too large, and consequently temperature rise is caused is solved, loss of the electromagnetic valve is reduced, and the service life is prolonged.

Description

Technical Field

[0001] This invention relates to the field of valve actuation technology, and specifically to a high-pressure opening and low-pressure holding valve actuation circuit based on a monostable trigger. Background Technology

[0002] In the field of industrial environmental protection testing, the control applications of various solenoid valves are increasing. For some application scenarios that require solenoid valves to be closed for a long time, the power consumption control and service life guarantee of valve components are the core technical problems that urgently need to be solved. Solenoid valves will consume a lot of power and generate a lot of heat when they are in a high-voltage closed state for a long time, which directly affects the performance and life of the solenoid valve.

[0003] Existing industrial control solenoid valves are simple to drive, using a single high-voltage power supply to maintain the closed state. The solenoid coil needs to be continuously supplied with the rated operating current to generate attraction, resulting in high power consumption. Moreover, the large amount of heat generated by the coil being energized for a long time cannot be dissipated in time, causing the temperature inside the valve body to rise continuously, thereby accelerating the aging and embrittlement of the insulation layer, and even posing a risk of partial short circuit. At the same time, high temperature will cause the rubber sealing ring to deform and age faster, leading to valve leakage, incomplete closure and other faults, which will significantly reduce the service life of the solenoid valve. To address this, a high-pressure opening and low-pressure holding valve drive circuit based on a monostable trigger is proposed. Summary of the Invention

[0004] To address the technical problems existing in the prior art, the present invention provides a high-voltage opening and low-voltage holding valve driving circuit based on a monostable trigger.

[0005] To solve the above technical problems, the present invention provides the following technical solution: a high-voltage opening and low-voltage holding valve driving circuit based on a monostable multivibrator, comprising a monostable multivibrator output module and a valve driving module. The output terminal of the monostable multivibrator output module is connected to the input terminal of the valve driving module, and a high-level control signal is input to the valve driving module to drive the solenoid valve. The monostable multivibrator output module is used to generate a high-level control signal of fixed duration, and the valve driving module is used to drive the solenoid valve.

[0006] Preferably, the monostable multivibrator output module includes a trigger chip U1, a fixed resistor R1, a capacitor C1, a gate drive resistor R2, and a fixed resistor R3. The Cext pin of the trigger chip U1 is connected to the capacitor C1, the RCext pin of the trigger chip U1 is connected to one end of the fixed resistor R1, the other end of the fixed resistor R1 is connected to a 3V power supply, the CLR pin of the trigger chip U1 is connected to a 3V power supply, one end of the gate drive resistor R2 is connected to both the B port of the trigger chip U1 and the gate of the main driving MOSFET Q3, and the other end of the gate drive resistor R2 is grounded through the fixed resistor R3.

[0007] Preferably, the source of the trigger chip U1 is connected to the anode of diode D1, the cathode of diode D1 is connected to the cathode of fixed resistor R8 and diodes D2 and D3, the other end of fixed resistor R8 is connected to the anode of LED, the cathode of LED is grounded, and the anode of diode D3 is grounded.

[0008] Preferably, the valve drive module includes a 24V valve drive module and a 12V valve drive module. Both the 24V valve drive module and the 12V valve drive module are externally connected to a solenoid valve. The 24V valve drive module is used to control the solenoid valve to open at high pressure, and the 12V valve drive module is used to control the solenoid valve to maintain low pressure.

[0009] Preferably, the 24V valve drive module includes a main drive MOSFET Q1, a gate voltage divider resistor R4, and a gate voltage divider resistor R5. One end of the gate voltage divider resistor R4 is connected to both the drain of the main drive MOSFET Q1 and the 24V power supply. The gate of the main drive MOSFET Q1 is connected to one end of the gate voltage divider resistor R5.

[0010] Preferably, the other end of the gate voltage divider resistor R5 is connected to the main driving MOSFET Q2, the source of the main driving MOSFET Q2 is grounded, and the Q pin of the trigger chip U1 is connected to the gate of the main driving MOSFET Q2.

[0011] Preferably, the 12V valve drive module includes a main drive MOSFET Q4, a gate voltage divider resistor R6, and a gate voltage divider resistor R7. One end of the gate voltage divider resistor R6 is connected to the drain of the main drive MOSFET Q4 and the 12V power supply. The main drive MOSFET Q4, the gate voltage divider resistor R6, and one end of the gate voltage divider resistor R7 are connected in series. The other end of the gate voltage divider resistor R7 is connected to the drain of the main drive MOSFET Q3.

[0012] Preferably, the source of the main driving MOS transistor Q4 is connected to the anode of the diode D2.

[0013] Preferably, the output time of the monostable multivibrator is... for:

[0014] ;

[0015] In the formula, K is the multiplication factor, R is the external charging resistor through which C is charged, and C is the external charging capacitor through which the external resistor is charged.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. This invention is based on general electronic devices and can control the high-voltage opening time to ensure stable opening of the solenoid valve and maintain the open state under low voltage. This avoids the problem of excessive power consumption and temperature rise caused by the solenoid valve being in a high-voltage closed state for a long time, thereby reducing the wear and tear of the solenoid valve and improving its service life. Especially in the field of electrolyte transfer valve in lithium battery production, it can not only improve the life of the transfer valve, but also eliminate the risk of electrolyte volatilization caused by high temperature.

[0018] 2. In this invention, the controller only needs to output one rising edge signal or step signal to test the high voltage start and low voltage hold function. The control logic is simple, the high voltage hold time is set by matching the external simple RC network, and the monostable trigger has a built-in dual slope trigger, which only triggers the rising edge, effectively avoiding malfunctions caused by voltage fluctuations, especially in application scenarios with high grid noise. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the high-pressure opening and low-pressure holding valve drive circuit of the present invention. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, which illustrate the above and other technical features and advantages of the present invention. However, the following embodiments are merely preferred embodiments of the present invention and are not exhaustive.

[0021] Example:

[0022] like Figure 1 As shown, the present invention provides a high-voltage opening and low-voltage holding valve driving circuit based on a monostable multivibrator, including a monostable multivibrator output module and a valve driving module. The output terminal of the monostable multivibrator output module is connected to the input terminal of the valve driving module, and a high-level control signal is input to the valve driving module to drive the solenoid valve. The monostable multivibrator output module is used to generate a high-level control signal of fixed duration, and the valve driving module is used to drive the solenoid valve.

[0023] The monostable multivibrator output module is triggered by an external input rising edge signal. After activation, the trigger chip U1 outputs a high level for a certain duration to drive the high-pressure valve drive circuit, causing the solenoid valve to open under high pressure. The output time of the monostable multivibrator output module is determined by the product of the fixed resistor R1 and the capacitor C1. At the same time, the high level of the rising edge signal directly drives the low-pressure valve drive circuit. When the control output of the trigger chip U1 ends, the high-pressure valve drive circuit fails, while the low-pressure drive circuit remains open, thus ensuring that the solenoid valve is open under high pressure and maintained under low pressure.

[0024] In this embodiment, the monostable multivibrator output module includes a trigger chip U1, a fixed resistor R1, a capacitor C1, a gate drive resistor R2, and a fixed resistor R3. The Cext pin of the trigger chip U1 is connected to the capacitor C1, the RCext pin of the trigger chip U1 is connected to one end of the fixed resistor R1, the other end of the fixed resistor R1 is connected to a 3V power supply, the CLR pin of the trigger chip U1 is connected to a 3V power supply, one end of the gate drive resistor R2 is connected to both the B port of the trigger chip U1 and the gate of the main drive MOS transistor Q3, and the other end of the gate drive resistor R2 is grounded through the fixed resistor R3.

[0025] In this embodiment, the source of the trigger chip U1 is connected to the anode of diode D1, the cathode of diode D1 is connected to the fixed resistor R8 and the cathodes of diodes D2 and D3, the other end of the fixed resistor R8 is connected to the anode of the LED, the cathode of the LED is grounded, and the anode of diode D3 is grounded.

[0026] In this embodiment, the valve drive module includes a 24V valve drive module and a 12V valve drive module. Both the 24V valve drive module and the 12V valve drive module are externally connected to a solenoid valve. The 24V valve drive module is used to control the solenoid valve to open at high pressure, and the 12V valve drive module is used to control the solenoid valve to maintain low pressure.

[0027] In this embodiment, the 24V valve drive module includes a main drive MOSFET Q1, a gate voltage divider resistor R4, and a gate voltage divider resistor R5. One end of the gate voltage divider resistor R4 is connected to both the drain of the main drive MOSFET Q1 and the 24V power supply. The gate of the main drive MOSFET Q1 is connected to one end of the gate voltage divider resistor R5.

[0028] In this embodiment, the other end of the gate voltage divider resistor R5 is connected to the main driving MOSFET Q2. The source of the main driving MOSFET Q2 is grounded. The monostable multivibrator controls the main driving MOSFET Q2 to turn on, thereby giving the gate of MOSFET Q1 a 12V voltage divider, which meets the turn-on condition. The Q pin of the trigger chip U1 is connected to the gate of the main driving MOSFET Q2.

[0029] In this embodiment, the 12V valve drive module includes a main drive MOSFET Q4, a gate voltage divider resistor R6, and a gate voltage divider resistor R7. One end of the gate voltage divider resistor R6 is connected to the drain of the main drive MOSFET Q4 and the 12V power supply. The main drive MOSFET Q4 and one end of the gate voltage divider resistor R6 are connected in series with the gate voltage divider resistor R7. The other end of the gate voltage divider resistor R7 is connected to the drain of the main drive MOSFET Q3. Before driving, an external rising edge signal controls the main drive MOSFET Q3 to turn on, thereby giving the gate of MOSFET Q4 a 6V voltage divider, thus achieving the turn-on condition. The source of the main drive MOSFET Q4 is connected to the anode of diode D2. After the main drive MOSFET Q4 conducts the 12V voltage, the valve drive circuit forms a loop, thereby enabling the solenoid valve to work under low voltage holding, which is the same as the function of MOSFET Q1 in the 24V valve drive.

[0030] In this embodiment, the output time of the monostable multivibrator for:

[0031] ;

[0032] In the formula, K is the multiplication factor, R is the external charging resistor through which C is charged, and C is the external charging capacitor through which the external resistor is charged.

[0033] When C ≥ 1000 pF, K = 1.0;

[0034] .

[0035] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A high-voltage opening and low-voltage holding valve driving circuit based on a monostable multivibrator, characterized in that, It includes a monostable multivibrator output module and a valve drive module. The output terminal of the monostable multivibrator output module is connected to the input terminal of the valve drive module, and a high-level control signal is input to the valve drive module to drive the solenoid valve. The monostable multivibrator output module is used to generate a high-level control signal of fixed duration, and the valve drive module is used to drive the solenoid valve.

2. The high-voltage opening and low-voltage holding valve driving circuit based on a monostable trigger as described in claim 1, characterized in that, The monostable multivibrator output module includes a trigger chip U1, a fixed resistor R1, a capacitor C1, a gate drive resistor R2, and a fixed resistor R3. The Cext pin of the trigger chip U1 is connected to the capacitor C1, and the RCext pin of the trigger chip U1 is connected to one end of the fixed resistor R1. The other end of the fixed resistor R1 is connected to a 3V power supply. The CLR pin of the trigger chip U1 is also connected to a 3V power supply. One end of the gate drive resistor R2 is connected to both the B port of the trigger chip U1 and the gate of the main drive MOS transistor Q3. The other end of the gate drive resistor R2 is grounded through the fixed resistor R3.

3. The high-voltage opening and low-voltage holding valve driving circuit based on a monostable trigger as described in claim 1, characterized in that, The source of the trigger chip U1 is connected to the anode of diode D1. The cathode of diode D1 is connected to the cathode of fixed resistor R8 and diodes D2 and D3. The other end of fixed resistor R8 is connected to the anode of LED. The cathode of LED is grounded, and the anode of diode D3 is grounded.

4. The high-voltage opening and low-voltage holding valve driving circuit based on a monostable trigger as described in claim 3, characterized in that, The valve drive module includes a 24V valve drive module and a 12V valve drive module. Both the 24V valve drive module and the 12V valve drive module are externally connected to solenoid valves. The 24V valve drive module is used to control the solenoid valve to open at high pressure, and the 12V valve drive module is used to control the solenoid valve to maintain low pressure.

5. The high-voltage opening and low-voltage holding valve driving circuit based on a monostable trigger as described in claim 4, characterized in that, The 24V valve drive module includes a main drive MOSFET Q1, a gate voltage divider resistor R4, and a gate voltage divider resistor R5. One end of the gate voltage divider resistor R4 is connected to both the drain of the main drive MOSFET Q1 and the 24V power supply. The gate of the main drive MOSFET Q1 is connected to one end of the gate voltage divider resistor R5.

6. The high-voltage opening and low-voltage holding valve driving circuit based on a monostable trigger as described in claim 2, characterized in that, The other end of the gate voltage divider resistor R5 is connected to the main driving MOSFET Q2. The source of the main driving MOSFET Q2 is grounded, and the Q pin of the trigger chip U1 is connected to the gate of the main driving MOSFET Q2.

7. The high-voltage opening and low-voltage holding valve driving circuit based on a monostable trigger as described in claim 4, characterized in that, The 12V valve drive module includes a main drive MOSFET Q4, a gate voltage divider resistor R6, and a gate voltage divider resistor R7. One end of the gate voltage divider resistor R6 is connected to the drain of the main drive MOSFET Q4 and the 12V power supply. The main drive MOSFET Q4 and one end of the gate voltage divider resistor R6 are connected in series with the gate voltage divider resistor R7. The other end of the gate voltage divider resistor R7 is connected to the drain of the main drive MOSFET Q3.

8. The high-voltage opening and low-voltage holding valve driving circuit based on a monostable trigger as described in claim 7, characterized in that, The source of the main driving MOSFET Q4 is connected to the anode of the diode D2.

9. The high-voltage opening and low-voltage holding valve driving circuit based on a monostable trigger as described in claim 1, characterized in that, The monostable multivibrator output time for: ； In the formula, K is the multiplication factor, R is the external charging resistor through which C is charged, and C is the external charging capacitor through which the external resistor is charged.

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