Electric valve control circuit with power failure detection and maintenance functions

Abstract

The utility model relates to the technical field of heating automatic control, in particular to an electrically operated valve control circuit with power failure detection and maintenance functions, which comprises an MCU (microprogrammed control unit) module, a control signal switching module, a motor driving module, a charging and discharging module, a power failure detection module and a power failure control module. The MCU module is connected with the motor driving module through the control signal switching module, the power failure control module is connected with the control signal switching module, the power failure detection module and the charging and discharging module, and the charging and discharging module is connected with the control signal switching module, the motor driving module and the power failure detection module. And the power failure detection module is connected with the power supply end. According to the utility model, automatic power-down detection and automatic pipe connection of the electrically operated valve can be realized, manual operation is not needed, convenience and high efficiency are realized, and the response speed is fast. In addition, according to the utility model, compatibility of circuit control and MCU control and priority management can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of heating automatic control, in particular to an electric valve control circuit with power-off detection and holding functions. Background Technique

[0002] In a heating system, the drive of an electric valve is often controlled by an MCU (microcontroller unit) module. This control method can realize automatic heating adjustment, improving the intelligence level and efficiency of the system. However, when the power is off, it will cause the electric valve unable to open, and then the heating system cannot operate normally, seriously affecting the life of users.

[0003] To solve this problem, the prior art usually reserves a manual switch device on the electric valve, so that in the case of power failure, users can open the electric valve through manual operation. However, this method often cannot detect and handle the problem of heating interruption in time, and the operation is inconvenient. Content of the Utility Model

[0004] To solve the above problems, the utility model provides an electric valve control circuit with power-off detection and holding functions, which can realize automatic power-off detection and automatic takeover of the electric valve, without manual operation, convenient and efficient, and with fast response speed.

[0005] To achieve the above object, the technical solution adopted by the utility model is:

[0006] An electric valve control circuit with power-off detection and holding functions, comprising: an MCU module, a control signal switching module, a motor drive module, a charge and discharge module, a power-off detection module, and a power-off control module, wherein,

[0007] The MCU module is connected to the motor drive module through the control signal switching module, the power-off control module is connected to the control signal switching module, the power-off detection module, and the charge and discharge module, the charge and discharge module is connected to the control signal switching module, the motor drive module, and the power-off detection module, and the power-off detection module is connected to the power supply terminal.

[0008] Further, the control signal switching module includes AA terminal, BB terminal, A terminal, B terminal, resistor R7, and resistor R11. The AA terminal is grounded through resistor R7, the BB terminal is grounded through resistor R11. The AA terminal and BB terminal are respectively connected to the motor drive module, the A terminal and B terminal are respectively connected to the MCU module. A resistor R8 is connected between the AA terminal and the A terminal, and a resistor R9 is connected between the BB terminal and the B terminal.

[0009] Further, the power-off control module includes a triode Q1, a zener diode D1, a resistor R1, a resistor R3, a resistor R4, and a resistor R6. The first terminal of the triode Q1 is grounded sequentially through the resistor R3 and the resistor R4. The second terminal of the triode Q1 is connected to the +5V voltage source through the resistor R1. The third terminal of the triode Q1 is connected to the AA terminal through the resistor R6. The negative electrode of the zener diode D1 is connected to the second terminal of the triode Q1, and the positive electrode of the zener diode D1 is grounded.

[0010] Further, the power-off detection module includes a resistor R5, a diode D2, and a diode D3. The power supply terminal is connected to the positive electrode of the diode D2. The negative electrode of the diode D2 is connected to the positive electrode of the diode D2 and one end of the resistor R5. The other end of the resistor R5 is connected to the common terminal of the resistor R3 and the resistor R4.

[0011] Further, the charge and discharge module includes a resistor R10, a diode D4, a capacitor EC1, and a capacitor EC2. The first terminal of the resistor R10 is connected to the positive electrode of the capacitor EC1. The negative electrode of the capacitor EC1 is grounded. The second terminal of the resistor R10 is connected to the +5V voltage source and the negative electrode of the diode D4. The positive electrode of the diode D4 is connected to the first terminal of the resistor R10. The negative electrode of the capacitor EC2 is connected to the +5V voltage source, and the positive electrode of the capacitor EC2 is grounded.

[0012] Further, the charge and discharge module further includes a capacitor C1. The first terminal of the capacitor C1 is connected to the +5V voltage source, and the second terminal of the capacitor C1 is grounded.

[0013] Further, the motor drive module includes an L9110S chip and its peripheral circuit.

[0014] The beneficial effects of the present utility model are as follows:

[0015] The present utility model includes: an MCU module, a control signal switching module, a motor drive module, a charge and discharge module, a power-off detection module, and a power-off control module. Among them, the MCU module is connected to the motor drive module through the control signal switching module. The power-off control module is connected to the control signal switching module, the power-off detection module, and the charge and discharge module. The charge and discharge module is connected to the control signal switching module, the motor drive module, and the power-off detection module. The power-off detection module is connected to the power supply terminal. The motor drive module is used to control the opening and closing of the electric valve. The power-off detection module is used to detect whether the power supply terminal is powered off. The control signal switching module is used to take over the motor drive module when the power supply terminal is powered off and control the charge and discharge module to discharge. The present utility model can realize automatic detection and automatic takeover of power-off of the electric valve, without manual operation, which is convenient, efficient, and has a fast response speed. Brief Description of the Drawings

[0016] Figure 1 is a circuit block diagram of the electric valve control circuit with power-off detection and holding function of the present utility model.

[0017] Figure 2 is a circuit diagram of the connection between the power-off detection module, power-off control module and control signal switching module of the present utility model.

[0018] Figure 3 is a circuit diagram of the charge and discharge module of the present utility model. Detailed Description of the Preferred Embodiment

[0019] Please refer to Figures 1-3 as shown, the present utility model provides an electric valve control circuit with power-off detection and holding function, which can realize automatic power-off detection and automatic takeover of the electric valve, without manual operation, convenient and efficient, and fast response speed.

[0020] The electric valve control circuit with power-off detection and holding function includes: an MCU module, a control signal switching module, a motor drive module, a charge and discharge module, a power-off detection module, and a power-off control module. Among them,

[0021] the MCU module is connected to the motor drive module through the control signal switching module, the power-off control module is connected to the control signal switching module, the power-off detection module and the charge and discharge module, the charge and discharge module is connected to the control signal switching module, the motor drive module and the power-off detection module, and the power-off detection module is connected to the power supply terminal.

[0022] It should be noted that the motor drive module is used to control the opening and closing of the electric valve; the power-off detection module is used to detect whether the power supply terminal is powered off, and the control signal switching module is used to take over the motor drive module when the power supply terminal is powered off and control the charge and discharge module to discharge.

[0023] Further, the control signal switching module includes AA terminal, BB terminal, A terminal, B terminal, resistor R7 and resistor R11. The AA terminal is grounded through resistor R7, the BB terminal is grounded through resistor R11. The AA terminal and BB terminal are respectively connected to the motor drive module, the A terminal and B terminal are respectively connected to the MCU module. A resistor R8 is connected between the AA terminal and A terminal, and a resistor R9 is connected between the BB terminal and B terminal. It should be noted that during the control process of the MCU module, when the A terminal is at a high level, the electric valve is opened.

[0024] Further, the power-off control module includes a triode Q1, a zener diode D1, a resistor R1, a resistor R3, a resistor R4, and a resistor R6. The first terminal (base) of the triode Q1 is grounded sequentially through the resistor R3 and the resistor R4. The second terminal (emitter) of the triode Q1 is connected to the +5V voltage source through the resistor R1. The third terminal (collector) of the triode Q1 is connected to the AA terminal through the resistor R6. The negative electrode of the zener diode D1 is connected to the second terminal of the triode Q1, and the positive electrode of the zener diode D1 is grounded.

[0025] Further, the power-off detection module includes a resistor R5, a diode D2, and a diode D3. The power supply terminal is connected to the positive electrode of the diode D2. The negative electrode of the diode D2 is connected to the positive electrode of the diode D2 and one end of the resistor R5. The other end of the resistor R5 is connected to the common terminal of the resistor R3 and the resistor R4.

[0026] Further, the charge and discharge module includes a resistor R10, a diode D4, a capacitor EC1, and a capacitor EC2. The first end of the resistor R10 is connected to the positive electrode of the capacitor EC1. The negative electrode of the capacitor EC1 is grounded. The second end of the resistor R10 is connected to the +5V voltage source and the negative electrode of the diode D4. The positive electrode of the diode D4 is connected to the first end of the resistor R10. The negative electrode of the capacitor EC2 is connected to the +5V voltage source, and the positive electrode of the capacitor EC2 is grounded. Further, the charge and discharge module further includes a capacitor C1. The first end of the capacitor C1 is connected to the +5V voltage source, and the second end of the capacitor C1 is grounded. In some embodiments, the charge and discharge module may employ a B0505S-1W chip and its peripheral circuit.

[0027] Further, the motor drive module includes an L9110S chip and its peripheral circuit.

[0028] In the above solution, when there is no power at the power supply terminal, the voltage across the resistor R5 is pulled down. At this time, the triode Q1 conducts and takes over the control of the control signal switching module. At the same time, the charge and discharge module discharges to supply the motor drive module to continue working. In other words, the motor drive module is switched from being controlled by the software signal of the original MCU to being controlled by the hardware circuits of the power-off control module and the charge and discharge module.

[0029] The utility model can realize the automatic detection and automatic takeover of power-off for the electric valve, without manual operation, which is convenient, efficient, and has a fast response speed. Moreover, the utility model can realize the compatibility between circuit control and MCU control.

[0030] The above embodiments are only descriptions of the preferred embodiments of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. An electric valve control circuit with power-off detection and holding function, characterized in that, It includes: an MCU module, a control signal switching module, a motor drive module, a charge and discharge module, a power-down detection module, and a power-down control module. Among them, the MCU module is connected to the motor drive module through the control signal switching module. The power-down control module is connected to the control signal switching module, the power-down detection module, and the charge and discharge module. The charge and discharge module is connected to the control signal switching module, the motor drive module, and the power-down detection module. The power-down detection module is connected to the power supply terminal.

2. The electric valve control circuit with power-off detection and holding function according to claim 1, characterized in that The control signal switching module includes an AA terminal, a BB terminal, an A terminal, a B terminal, a resistor R7, and a resistor R11. The AA terminal is grounded through the resistor R7. The BB terminal is grounded through the resistor R11. The AA terminal and the BB terminal are respectively connected to the motor drive module. The A terminal and the B terminal are respectively connected to the MCU module. A resistor R8 is connected between the AA terminal and the A terminal. A resistor R9 is connected between the BB terminal and the B terminal.

3. The electric valve control circuit with power-off detection and holding function according to claim 2, characterized in that, The power-down control module includes a triode Q1, a zener diode D1, a resistor R1, a resistor R3, a resistor R4, and a resistor R6. The first end of the triode Q1 is grounded sequentially through the resistor R3 and the resistor R4. The second end of the triode Q1 is connected to the +5V voltage source through the resistor R1. The third end of the triode Q1 is connected to the AA terminal through the resistor R6. The negative electrode of the zener diode D1 is connected to the second end of the triode Q1. The positive electrode of the zener diode D1 is grounded.

4. The electric valve control circuit with power-off detection and holding function according to claim 3, characterized in that, The power-down detection module includes a resistor R5, a diode D2, and a diode D3. The power supply terminal is connected to the positive electrode of the diode D2. The negative electrode of the diode D2 is connected to the positive electrode of the diode D2 and one end of the resistor R5. The other end of the resistor R5 is connected to the common terminal of the resistor R3 and the resistor R4.

5. The electric valve control circuit with power-off detection and holding function according to claim 4, characterized in that The charge and discharge module includes a resistor R10, a diode D4, a capacitor EC1, and a capacitor EC2. The first end of the resistor R10 is connected to the positive electrode of the capacitor EC1. The negative electrode of the capacitor EC1 is grounded. The second end of the resistor R10 is connected to the +5V voltage source and the negative electrode of the diode D4. The positive electrode of the diode D4 is connected to the first end of the resistor R10. The negative electrode of the capacitor EC2 is connected to the +5V voltage source. The positive electrode of the capacitor EC2 is grounded.

6. The electric valve control circuit with power-off detection and holding function according to claim 5, characterized in that, The charge and discharge module further includes a capacitor C1. The first end of the capacitor C1 is connected to the +5V voltage source. The second end of the capacitor C1 is grounded.

7. The electric valve control circuit with power-off detection and holding function according to claim 1, characterized in that, The motor drive module includes an L9110S chip and its peripheral circuit.

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