Valve self-checking and starting circuit based on resistance-type driving

Abstract

The utility model discloses a valve self-checking and starting circuit based on resistance-type driving, which comprises an input port and an output port, the input port comprises an input positive electrode and an input negative electrode, the output port comprises an output positive electrode and an output negative electrode, the valve self-checking and starting circuit comprises a voltage detection circuit used for collecting the voltage of the output port in real time and feeding back the collected voltage value to an MCU unit; the MCU unit is used for receiving the acquired voltage value, comparing the acquired voltage value with a preset normal acquisition value range to judge the working state of the load, and feeding back the working state of the load to a terminal or starting an alarm when the acquired voltage value is not in the preset normal acquisition range; the working states of the load comprise a connection fault, a working fault and normal working; and the load starting circuit is used for receiving the control signal of the MCU unit in real time and starting or closing the output port according to the control signal of the MCU unit. According to the valve self-checking and starting circuit based on resistance-type driving, the reliability of equipment operation is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic valves, in particular to a valve self-test and start-up circuit based on resistance drive. Background Art

[0002] In modern electronic equipment, various valve activation applications are becoming increasingly widespread, and valve safety and accuracy requirements are becoming increasingly stringent, making valve control and self-testing particularly important. Currently, most solenoid valves on the market are single solenoid valves or multiple solenoid valves connected in parallel. Both types only have positive and negative control functions, and lack feedback or self-test interfaces. This poses a risk of solenoid valve damage or failure during use. Utility Model Content

[0003] In order to solve the technical problems existing in the background technology, the utility model proposes a valve self-test and start-up circuit based on resistive drive.

[0004] The utility model proposes a valve self-test and start-up circuit based on resistive drive, including an input port and an output port, wherein the input port includes an input positive electrode and an input negative electrode, and the output port includes an output positive electrode and an output negative electrode, including:

[0005] The voltage detection circuit is used to collect the voltage of the output port in real time and feed the collected voltage value back to the MCU unit;

[0006] The MCU unit is used to receive the collected voltage value and compare it with the preset normal collection value range to determine the working status of the load. When the collected voltage value is not within the preset normal collection range, the load working status is fed back to the terminal or an alarm is activated. The load working status includes connection failure, working failure, and normal operation;

[0007] The load startup circuit is used to receive the control signal of the MCU unit in real time and start or shut down the output port according to the control signal of the MCU unit;

[0008] Among them, the output end of the voltage detection circuit is electrically connected to the input end of the MCU unit; the output end of the MCU unit is electrically connected to the input end of the load startup circuit; the input end of the voltage detection circuit is electrically connected to the output port.

[0009] Preferably, the voltage detection circuit includes a resistor R3, a resistor R4, a resistor R5, a capacitor C5, and a switching diode D3; one end of the resistor R3 is electrically connected to one end of the resistor R4; one end of the resistor R3 is electrically connected to one end of the resistor R5, and the other end of the resistor R3 is electrically connected to the output negative pole of the output port; the other end of the resistor R4 is grounded, the other end of the resistor R5 is electrically connected to one end of the capacitor C5, the other end of the capacitor C5 is grounded, the other end of the resistor R5 is electrically connected to the first end of the switching diode D3, the second end of the switching diode D3 is grounded, and the third end of the switching diode D3 is connected to the power supply VDD; the other end of the resistor R5 is electrically connected to the input end of the MCU unit.

[0010] Preferably, the load startup circuit includes a resistor R1, a resistor R2, and a field effect transistor Q1, one end of the resistor R1 is electrically connected to one end of the resistor R2, the other end of the resistor R2 is grounded, one end of the resistor R1 is electrically connected to the gate G of the field effect transistor Q1, the source S of the field effect transistor Q1 is grounded, the drain D of the field effect transistor Q1 is electrically connected to the output negative pole of the output port, and the other end of the resistor R1 is electrically connected to the output end of the MCU unit.

[0011] Preferably, the output cathode of the output port is electrically connected to one end of the capacitor C4 , the other end of the capacitor C4 is grounded, and one end of the capacitor C4 is electrically connected to the drain D of the field effect transistor Q1 .

[0012] Preferably, it also includes:

[0013] A first filtering circuit, configured to perform input filtering on an input port;

[0014] The first anti-backflow circuit is used to prevent voltage backflow when the back-end circuit is disturbed by surge voltage to protect the front-end circuit;

[0015] The protection circuit is used to disconnect the positive pole of the circuit to protect the circuit and solenoid valve when the back-end circuit is misoperated and causes a short circuit or interference current passes through;

[0016] The second anti-reverse circuit is used for inductive load freewheeling;

[0017] A second filtering circuit, used for output filtering of the circuit;

[0018] Among them, one end of the first filter circuit is electrically connected to the input end of the first anti-reverse circuit; the output end of the first anti-reverse circuit is electrically connected to one end of the protection circuit; one end of the second filter circuit is electrically connected to the output positive pole of the output port; the second anti-reverse circuit is connected in series between the other end of the protection circuit and the other end of the second filter circuit; the other end of the first filter circuit is electrically connected to the input port.

[0019] Preferably, the first filtering circuit specifically includes a capacitor C1 and a capacitor C2, the first anti-reverse circuit is specifically a diode D1, the second anti-reverse circuit is specifically a diode D2, the second filtering circuit is specifically a capacitor C3, and the protection circuit is specifically a fuse F1; the capacitor C1 is connected in series between the input positive pole and the input negative pole of the input port, one end of the capacitor C1 is electrically connected to one end of the capacitor C2, the other end of the capacitor C1 and the other end of the capacitor C2 are both grounded, one end of the capacitor C2 is electrically connected to the positive pole of the diode D1, the negative pole of the diode D1 is electrically connected to one end of the fuse F1, the other end of the fuse F1 is electrically connected to the negative pole of the diode D2, the positive pole of the diode D2 is grounded, the negative pole of the diode D2 is electrically connected to one end of the capacitor C3, the other end of the capacitor C3 is grounded, and one end of the capacitor C3 is electrically connected to the output positive pole of the output port.

[0020] This utility model proposes a valve self-check and startup circuit based on a resistive drive. Before load operation and during periods of inactivity, the MCU unit determines the connectivity between the valve and the main circuit based on the voltage detected by the voltage detection circuit. This intelligent valve opening and status check is implemented through the MCU unit, allowing for real-time monitoring of valve connection faults and open / close status. In the event of load anomalies, timely reporting or alarms are generated, improving the reliability, safety, and effectiveness of equipment operation, minimizing losses caused by failures, and effectively extending the service life and service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the circuit architecture of a valve self-test and start-up circuit based on resistive drive proposed in the present invention;

[0022] Figure 2 This is a schematic diagram of the overall architecture of a valve self-test and start-up circuit based on resistive drive proposed by the present invention;

[0023] Figure 3 This is a schematic diagram of the implementation structure of a valve self-test and start-up circuit based on resistive drive proposed by the utility model.

[0024] Legend:

[0025] 1. Input port; 2. First filter circuit; 3. First anti-reverse circuit; 4. Protection circuit; 5. Second anti-reverse circuit; 6. Second filter circuit; 7. Output port; 8. Voltage detection circuit; 9. Load start-up circuit. DETAILED DESCRIPTION

[0026] Reference Figure 1-3The present invention proposes a valve self-test and start-up circuit based on resistive drive, including an input port 1 and an output port 7. The input port 1 includes an input positive electrode and an input negative electrode, and the output port 7 includes an output positive electrode and an output negative electrode, including:

[0027] The voltage detection circuit 8 is used to collect the voltage of the output port 7 in real time and feed the collected voltage value back to the MCU unit.

[0028] In this embodiment, the voltage detection circuit 8 includes a resistor R3, a resistor R4, a resistor R5, a capacitor C5, and a switching diode D3; one end of the resistor R3 is electrically connected to one end of the resistor R4; one end of the resistor R3 is electrically connected to one end of the resistor R5, and the other end of the resistor R3 is electrically connected to the output negative electrode of the output port 7; the other end of the resistor R4 is grounded, the other end of the resistor R5 is electrically connected to one end of the capacitor C5, the other end of the capacitor C5 is grounded, the other end of the resistor R5 is electrically connected to the first end of the switching diode D3, the second end of the switching diode D3 is grounded, and the third end of the switching diode D3 is connected to the power supply VDD; the other end of the resistor R5 is electrically connected to the input end of the MCU unit.

[0029] In this embodiment, the input port 1 is the positive and negative electrodes of the front-end voltage provided by the electromagnetic valve.

[0030] The MCU unit is used to receive the collected voltage value and compare it with the preset normal collection value range to determine the working status of the load. When the collected voltage value is not within the preset normal collection range, the working status of the load is fed back to the terminal or the alarm is activated. The working status of the load includes connection failure, working failure, and normal operation.

[0031] In this embodiment, the voltage is detected in real time and fed back to the MCU unit. Once an abnormality is detected, the MCU quickly sends instructions to the upper-level equipment or alarm, making it convenient for technicians to remotely understand the fault information and respond quickly to avoid losses caused by valve failure.

[0032] In this embodiment, the MCU unit determines the time:

[0033] RCxln[(1-1 / 3) / (1-2 / 3)]=RCxln2=0.693RC,

[0034] Among them, RC corresponds to Figure 3 When C5 is not soldered, the time is almost 0 and can be ignored. Adjusting R5 and C5 can flexibly adjust the MCU judgment time.

[0035] MCU feedback time: After receiving voltage information, the MCU starts to judge and send instructions, which can be as fast as µs level.

[0036] MCU response time = MCU judgment time + MCU feedback time, where the MCU feedback time can be ignored.

[0037] In this embodiment, the commonly used valve voltage is generally between DC=5V and 48V. This circuit can adapt to a wide voltage range of voltage output. With different voltage inputs, the parameters can be flexibly adjusted to meet the application of commonly used valves.

[0038] In this embodiment, the MCU unit can determine whether the valve is properly connected by collecting the divided voltage value U2 of the resistors R3 and R4. When the load is working normally, that is, the connection is correct, U2 = R4 / (R3+R4+Ri)*U0, where Ri is the internal resistance of the valve, and the values of R3 and R4 are determined by the power supply U0 of the output circuit; when the load is working properly or has a connection fault, such as when the connection is disconnected, U2 = 0.

[0039] In this embodiment, the load startup and self-test circuit is composed of an N-channel enhancement mode field effect transistor, a resettable fuse, an electrolytic capacitor, two general diodes, a switch diode and several chip resistors and capacitors.

[0040] The load startup circuit 9 is used to receive the control signal of the MCU unit in real time and start or shut down the output port 7 according to the control signal of the MCU unit.

[0041] In this embodiment, the load startup circuit 9 includes a resistor R1, a resistor R2, and a field effect transistor Q1. One end of the resistor R1 is electrically connected to one end of the resistor R2, the other end of the resistor R2 is grounded, one end of the resistor R1 is electrically connected to the gate G of the field effect transistor Q1, the source S of the field effect transistor Q1 is grounded, the drain D of the field effect transistor Q1 is electrically connected to the output negative electrode of the output port 7, and the other end of the resistor R1 is electrically connected to the output end of the MCU unit.

[0042] Among them, the output end of the voltage detection circuit 8 is electrically connected to the input end of the MCU unit; the output end of the MCU unit is electrically connected to the input end of the load startup circuit 9; the input end of the voltage detection circuit 8 is electrically connected to the output port 7.

[0043] In this embodiment, the output cathode of the output port 7 is electrically connected to one end of the capacitor C4 , the other end of the capacitor C4 is grounded, and one end of the capacitor C4 is electrically connected to the drain D of the field effect transistor Q1 .

[0044] Specifically, such as Figure 3 As shown, the MCU unit power supply voltage is defined as VCC, and the high level of port IO_CTRL1 is the output terminal of the MCU unit. Resistors R1 and R2 divide the voltage to obtain a certain output voltage U1. The calculation process of output voltage U1 is as follows:

[0045] U1=R2 / (R1+R2)*VCC;

[0046] The values of R1 and R2 should satisfy U1 ≥ 0.8VCC. The high and low levels of port IO_CTRL1 control the on and off state of field-effect transistor Q1. When field-effect transistor Q1 is on, the valve's negative DC_Drv- connects to GND in the circuit through Q1, forming a loop and activating the valve. Otherwise, the valve is closed. Diode D1 provides reverse current protection, while diode D2 provides freewheeling for inductive loads. Capacitors C1, C2, C3, and C4 provide port filtering.

[0047] In this embodiment, it also includes:

[0048] The first filtering circuit 2 is used to perform input filtering on the input port 1 .

[0049] The first anti-backflow circuit 3 is used to prevent voltage backflow when the back-end circuit is disturbed by impulse voltage, thereby protecting the front-end circuit.

[0050] The protection circuit 4 is used to disconnect the positive pole of the circuit to protect the circuit and the solenoid valve when the back-end circuit is misoperated and causes a short circuit or an interference current passes through.

[0051] In this embodiment, the fuse F1 in the circuit is a resettable fuse. When a short circuit occurs due to erroneous operation or a large current flows due to interference at the rear end, the fuse can quickly respond and disconnect the positive pole of the circuit to protect the circuit and the solenoid valve.

[0052] The second anti-reverse circuit 5 is used for inductive load freewheeling.

[0053] The second filtering circuit 6 is used for output filtering of the circuit.

[0054] Among them, one end of the first filter circuit 2 is electrically connected to the input end of the first anti-reverse circuit 3; the output end of the first anti-reverse circuit 3 is electrically connected to one end of the protection circuit 4; one end of the second filter circuit 6 is electrically connected to the output positive pole of the output port 7; the second anti-reverse circuit 5 is connected in series between the other end of the protection circuit 4 and the other end of the second filter circuit 6; the other end of the first filter circuit 2 is electrically connected to the input port 1.

[0055] In this embodiment, the first filter circuit 2 specifically includes a capacitor C1 and a capacitor C2, the first anti-reverse circuit 3 is specifically a diode D1, the second anti-reverse circuit 5 is specifically a diode D2, the second filter circuit 6 is specifically a capacitor C3, and the protection circuit 4 is specifically a fuse F1; a capacitor C1 is connected in series between the input positive pole and the input negative pole of the input port 1, one end of the capacitor C1 is electrically connected to one end of the capacitor C2, the other end of the capacitor C1 and the other end of the capacitor C2 are both grounded, one end of the capacitor C2 is electrically connected to the positive pole of the diode D1, the negative pole of the diode D1 is electrically connected to one end of the fuse F1, the other end of the fuse F1 is electrically connected to the negative pole of the diode D2, the positive pole of the diode D2 is grounded, the negative pole of the diode D2 is electrically connected to one end of the capacitor C3, the other end of the capacitor C3 is grounded, and one end of the capacitor C3 is electrically connected to the output positive pole of the output port 7.

[0056] Specifically, such as Figure 3 As shown, the load starting circuit 9 is connected to the ground by a field effect tube, and the field effect tube can be flexibly selected according to the output voltage and the actual working current of the valve.

[0057] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A valve self-test and start-up circuit based on resistive drive, comprising an input port (1) and an output port (7), wherein the input port (1) comprises an input positive electrode and an input negative electrode, and the output port (7) comprises an output positive electrode and an output negative electrode, and is characterized in that: include: A voltage detection circuit (8) is used to collect the voltage of the output port (7) in real time and feed the collected voltage value back to the MCU unit; The MCU unit is used to receive the collected voltage value and compare it with the preset normal collection value range to determine the working status of the load. When the collected voltage value is not within the preset normal collection range, the load working status is fed back to the terminal or an alarm is activated. The load working status includes connection failure, working failure, and normal operation; A load start-up circuit (9) is used to receive a control signal from the MCU unit in real time and start or shut down the output port (7) according to the control signal from the MCU unit; The output end of the voltage detection circuit (8) is electrically connected to the input end of the MCU unit; the output end of the MCU unit is electrically connected to the input end of the load start-up circuit (9); and the input end of the voltage detection circuit (8) is electrically connected to the output port (7).

2. The valve self-test and start-up circuit based on resistive drive according to claim 1, characterized in that: The voltage detection circuit (8) includes a resistor R3, a resistor R4, a resistor R5, a capacitor C5, and a switching diode D3; one end of the resistor R3 is electrically connected to one end of the resistor R4; one end of the resistor R3 is electrically connected to one end of the resistor R5, and the other end of the resistor R3 is electrically connected to the output negative electrode of the output port (7); the other end of the resistor R4 is grounded, the other end of the resistor R5 is electrically connected to one end of the capacitor C5, the other end of the capacitor C5 is grounded, the other end of the resistor R5 is electrically connected to the first end of the switching diode D3, the second end of the switching diode D3 is grounded, and the third end of the switching diode D3 is connected to the power supply VDD; the other end of the resistor R5 is electrically connected to the input end of the MCU unit.

3. The valve self-test and start-up circuit based on resistive drive according to claim 2, characterized in that: The load startup circuit (9) includes a resistor R1, a resistor R2, and a field effect transistor Q1. One end of the resistor R1 is electrically connected to one end of the resistor R2, the other end of the resistor R2 is grounded, one end of the resistor R1 is electrically connected to the gate G of the field effect transistor Q1, the source S of the field effect transistor Q1 is grounded, the drain D of the field effect transistor Q1 is electrically connected to the output negative electrode of the output port (7), and the other end of the resistor R1 is electrically connected to the output end of the MCU unit.

4. The valve self-test and start-up circuit based on resistive drive according to claim 3, characterized in that: The output negative electrode of the output port (7) is electrically connected to one end of the capacitor C4, the other end of the capacitor C4 is grounded, and one end of the capacitor C4 is electrically connected to the drain D of the field effect transistor Q1.

5. The valve self-test and start-up circuit based on resistive drive according to claim 1, characterized in that: Also includes: A first filtering circuit (2) is used for performing input filtering on the input port (1); A first anti-backflow circuit (3) is used to prevent voltage backflow when the back-end circuit is disturbed by an impulse voltage, thereby protecting the front-end circuit; A protection circuit (4) is used to disconnect the positive electrode of the circuit to protect the circuit and the solenoid valve when the back-end circuit is misoperated and causes a short circuit or is subject to interference current; A second anti-reverse circuit (5) is used for inductive load continuous current; A second filtering circuit (6), used for output filtering of the circuit; One end of the first filter circuit (2) is electrically connected to the input end of the first anti-reverse circuit (3); the output end of the first anti-reverse circuit (3) is electrically connected to one end of the protection circuit (4); one end of the second filter circuit (6) is electrically connected to the output positive pole of the output port (7); the second anti-reverse circuit (5) is connected in series between the other end of the protection circuit (4) and the other end of the second filter circuit (6); and the other end of the first filter circuit (2) is electrically connected to the input port (1).

6. The valve self-test and start-up circuit based on resistive drive according to claim 5, characterized in that: The first filter circuit (2) specifically includes a capacitor C1 and a capacitor C2, the first anti-reverse circuit (3) specifically includes a diode D1, the second anti-reverse circuit (5) specifically includes a diode D2, the second filter circuit (6) specifically includes a capacitor C3, and the protection circuit (4) specifically includes a fuse F1; the capacitor C1 is connected in series between the input positive electrode and the input negative electrode of the input port (1), one end of the capacitor C1 is electrically connected to one end of the capacitor C2, the other end of the capacitor C1 and the other end of the capacitor C2 are both grounded, one end of the capacitor C2 is electrically connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is electrically connected to one end of the fuse F1, the other end of the fuse F1 is electrically connected to the negative electrode of the diode D2, the positive electrode of the diode D2 is grounded, the negative electrode of the diode D2 is electrically connected to one end of the capacitor C3, the other end of the capacitor C3 is grounded, and one end of the capacitor C3 is electrically connected to the output positive electrode of the output port (7).

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