Gas meter valve control circuit

Abstract

The utility model discloses a gas table valve control circuit, include: control module, valve control module and power supply, valve control module includes: first control formula switch unit, second control formula switch unit, first controllable power supply unit and second controllable power supply unit, and the high voltage end of first control formula switch unit is connected to the valve control module first output after forming the control end of second control formula switch unit, and the high voltage end of second control formula switch unit is connected to the valve control module second output after forming the control end of first control formula switch unit, valve control module first output is connected to the electric coil first end in valve, and valve control module second output is connected to the electric coil second end in valve, and the control end of first controllable power supply unit is connected to control module first output. The gas table valve control circuit, solve the problem that cannot control the valve driven by electric coil in the prior art.

Description

Technical Field

[0001] This utility model relates to gas meter circuits, specifically to a gas meter valve control circuit. Background Technology

[0002] A valve is installed in the gas meter. The valve is opened and closed by an electric coil. The electric coil is connected to a first-direction voltage to open the valve, and the electric coil is connected to a second-direction voltage to close the valve. The first-direction voltage and the second-direction voltage are in opposite directions.

[0003] Chinese patent discloses a smart gas meter valve switch controller with application number CN200820168130.6. In this smart gas meter valve switch controller, the signal input terminal a is connected to the base of transistor Q1, the emitter of transistor Q1 is connected to the base of transistor Q2, the signal input terminal b is connected to the base of transistor Q4, the emitter of transistor Q4 is connected to the base of transistor Q3, the emitter of transistor Q2 is connected to the emitter of transistor Q3, the collector of transistor Q1 is connected to the base of transistor Q5, the collector of transistor Q5 is connected to the collector of transistor Q3, the collector of transistor Q4 is connected to the base of transistor Q6, the collector of transistor Q6 is connected to the collector of transistor Q2, and the emitter of transistor Q5 is connected to the emitter of transistor Q6. This utility model has a simple structure and a reasonable circuit design. It changes the forward and reverse rotation of the DC motor M by sending forward and reverse signals through remote control. The DC motor M drives the valve to rotate, thereby realizing the opening and closing of the valve.

[0004] Although the aforementioned smart gas meter valve switch controller can control the valve to perform opening and closing actions, it still has a drawback: it cannot control valves driven by electric coils, resulting in the inability to achieve valve opening and closing control. Summary of the Invention

[0005] This utility model provides a gas meter valve control circuit to solve the problem in the prior art that valves driven by electric coils cannot be controlled.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: This utility model discloses a gas meter valve control circuit, including: a control module, a valve control module, and a power supply; the valve control module includes: a first controllable switch unit, a second controllable switch unit, a first controllable power supply unit, and a second controllable power supply unit. The high-voltage terminal of the first controllable switch unit is connected to the control terminal of the second controllable switch unit to form the first output terminal of the valve control module, and the high-voltage terminal of the second controllable switch unit is connected to the control terminal of the first controllable switch unit to form the second output terminal of the valve control module; the first output terminal of the valve control module is connected to the first terminal of the valve's coil, and the second output terminal of the valve control module is connected to the second terminal of the valve's coil; the control terminal of the first controllable power supply unit is connected to the first output terminal of the control module, and the power supply terminal of the first controllable power supply unit is powered by the first output terminal of the power supply; the output terminal of the first controllable power supply unit is connected to the control terminal of the first controllable switch unit; the control terminal of the second controllable power supply unit is connected to the second output terminal of the control module, and the power supply terminal of the second controllable power supply unit is powered by the first output terminal of the power supply; the output terminal of the second controllable power supply unit is connected to the control terminal of the second controllable switch unit.

[0007] Preferably, the power supply includes: a fixed power supply, a first buck regulator unit, and a second buck regulator unit. The positive terminal of the fixed power supply is connected to the input terminal of the first buck regulator unit, and the output terminal of the first buck regulator unit is connected to the input terminal of the second buck regulator unit. The output terminal of the first buck regulator unit is the first output terminal of the power supply, and the output terminal of the second buck regulator unit is the second output terminal of the power supply. The second output terminal of the power supply supplies power to the control module.

[0008] Preferably, the power supply further includes a voltage detection unit, the input terminal of which is connected to the positive terminal of the fixed power supply, and the output terminal of which is connected to the input terminal of the control module.

[0009] Preferably, the power supply further includes a current limiting unit, the input terminal of which is connected to the positive terminal of the fixed power supply, and the output terminal of which is connected to the input terminal of the first step-down voltage regulator unit.

[0010] Preferably, both the first controllable power supply unit and the second controllable power supply unit include: resistor R1, resistor R2, NPN transistor Q1, and NPN transistor Q2. The first end of resistor R1 is the control terminal of the first or second controllable power supply unit. The second end of resistor R1 is connected to the base of NPN transistor Q1. The emitter of NPN transistor Q1 is grounded. The collector of NPN transistor Q1 is connected to the first end of resistor R2. The second end of resistor R2 is connected to the base of NPN transistor Q2. The collector of NPN transistor Q2 is the output terminal of the first or second controllable power supply unit. The emitter of NPN transistor Q2 is connected to the first terminal of the power supply.

[0011] Preferably, both the first controllable switching unit and the second controllable switching unit include: a resistor R3 and an NPN transistor Q3. The first end of the resistor R3 is the control terminal of the first or second controllable switching unit, the second end of the resistor R3 is connected to the base of the NPN transistor Q3, the emitter of the NPN transistor Q3 is grounded, and the collector of the NPN transistor Q3 is the high-voltage terminal of the first or second controllable switching unit.

[0012] Preferably, the voltage detection unit includes: resistor R4 and resistor R5, the first end of resistor R4 is the input end of the voltage detection unit, the second end of resistor R4 is grounded through resistor R5, and the second end of resistor R4 is the output end of the voltage detection unit.

[0013] Compared with the prior art, this utility model has the following beneficial effects: In this application, by setting a first controllable power supply unit and a second controllable power supply unit, it is realized that under the control of the control module, when the first controllable power supply unit has a high voltage output, the second controllable power supply unit does not have a high voltage output; when the first controllable power supply unit does not have a high voltage output, the second controllable power supply unit outputs a high voltage, thereby enabling the valve control module formed by connecting the first controllable switch unit and the second controllable switch unit to output a higher voltage at the first output end or the valve control module output a higher voltage at the second output end, realizing the exchange connection of high voltage at both ends of the coil, and realizing the valve is driven to close or open after the coil is connected to voltage in different directions.

[0014] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0015] Figure 1 This is the circuit diagram for the valve control module.

[0016] Figure 2 This is the circuit diagram for the power supply.

[0017] Figure 3 This is the circuit diagram for the control module. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model clearer and easier to understand, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] like Figures 1 to 3 As shown, this utility model discloses a gas meter valve control circuit, including: a control module, a valve control module, and a power supply; the valve control module includes: a first controllable switch unit, a second controllable switch unit, a first controllable power supply unit, and a second controllable power supply unit. The high-voltage terminal of the first controllable switch unit is connected to the control terminal of the second controllable switch unit to form the first output terminal of the valve control module, and the high-voltage terminal of the second controllable switch unit is connected to the control terminal of the first controllable switch unit to form the second output terminal of the valve control module; the first output terminal of the valve control module is connected to the first terminal F-1 of the valve's electrical coil, and the second output terminal of the valve control module is connected to the second terminal F-2 of the valve's electrical coil; the control terminal of the first controllable power supply unit is connected to the first output terminal of the control module, and the power supply terminal of the first controllable power supply unit is powered by the first output terminal of the power supply; the output terminal of the first controllable power supply unit is connected to the control terminal FOPEN of the first controllable switch unit; the control terminal of the second controllable power supply unit is connected to the second output terminal of the control module, and the power supply terminal of the second controllable power supply unit is powered by the first output terminal of the power supply; the output terminal of the second controllable power supply unit is connected to the control terminal FCLOSE of the second controllable switch unit.

[0020] The control module primarily uses the STM8L052C6 control chip U3, although other types of control chips can also be used. The PC4 / AN4 / SMB1 / CCO / CK1 / COM4 pins of the control chip U3 are the input terminals of the control module. The PD7 / SEG21 / AN7 / NSS2 pins of the control chip U3 are the first output terminals of the control module, and the PD6 / SEG20 / AN8 / SCK2 pins of the control chip U3 are the second output terminals of the control module.

[0021] In this application, the power supply includes: a fixed power supply, a first buck regulator unit, and a second buck regulator unit. The positive terminal of the fixed power supply is connected to the input terminal of the first buck regulator unit, and the output terminal of the first buck regulator unit is connected to the input terminal of the second buck regulator unit. The output terminal of the first buck regulator unit is the first output terminal VCC of the power supply, and the output terminal of the second buck regulator unit is the second output terminal VDD of the power supply. The second output terminal VDD of the power supply supplies power to the control module. The fixed power supply uses battery B1, which outputs a 6V voltage. The first buck regulator unit reduces the 6V voltage to a 5V voltage, and the second buck regulator unit reduces the 5V voltage to a 3.3V voltage.

[0022] In this application, the power supply further includes a voltage detection unit. The input terminal of the voltage detection unit is connected to the positive terminal of the fixed power supply, and the output terminal BATAD of the voltage detection unit is connected to the input terminal of the control module. This enables the detection of whether the fixed power supply still has power.

[0023] In this application, the power supply further includes a current limiting unit, the input terminal of which is connected to the positive terminal of the fixed power supply, and the output terminal of which is connected to the input terminal of the first step-down voltage regulator unit. When the output voltage of the fixed power supply is low, the current limiting unit restricts the reverse current to avoid affecting the detection results of the voltage detection unit.

[0024] Preferably, both the first and second controllable power supply units include: resistors R1 and R2, NPN transistors Q1 and Q2. The first terminal of resistor R1 is the control terminal of the first or second controllable power supply unit. The second terminal of resistor R1 is connected to the base of NPN transistor Q1. The emitter of NPN transistor Q1 is grounded. The collector of NPN transistor Q1 is connected to the first terminal of resistor R2. The second terminal of resistor R2 is connected to the base of NPN transistor Q2. The collector of NPN transistor Q2 is the output terminal of the first or second controllable power supply unit. The emitter of NPN transistor Q2 is connected to the first terminal of the power supply. When the first or second output terminal of the control module outputs a high level, NPN transistors Q1 and Q2 are closed, and the collector of NPN transistor Q2 outputs a high voltage.

[0025] In this application, both the first controllable switching unit and the second controllable switching unit include: a resistor R3 and an NPN transistor Q3. The first end of the resistor R3 is the control terminal of the first or second controllable switching unit, the second end of the resistor R3 is connected to the base of the NPN transistor Q3, the emitter of the NPN transistor Q3 is grounded, and the collector of the NPN transistor Q3 is the high-voltage terminal of the first or second controllable switching unit. When the first controllable power supply unit outputs a high voltage, the second controllable power supply unit outputs a low voltage. The base of NPN transistor Q3 in the first controllable switching unit is at a high level. At this time, R3 has a voltage reduction effect. NPN transistor Q3 in the second controllable switching unit is closed, the first terminal F-1 of the coil outputs a low level, and the second terminal F-2 of the coil outputs a high level. Conversely, when the second controllable power supply unit outputs a high voltage, the first controllable power supply unit outputs a low voltage. The base of NPN transistor Q3 in the second controllable switching unit is at a high level. At this time, R3 has a voltage reduction effect. NPN transistor Q3 in the second controllable switching unit is closed, the second terminal F-2 of the coil outputs a low level, and the first terminal F-1 of the coil outputs a high level. This allows switching the first terminal F-1 or the second terminal F-2 of the coil to a high level by controlling the first and second controllable power supply units.

[0026] Preferably, the voltage detection unit includes resistors R4 and R5. The first terminal of resistor R4 is the input terminal of the voltage detection unit, and the second terminal of resistor R4 is grounded through resistor R5. The second terminal of resistor R4 is also the output terminal of the voltage detection unit. Resistors R4 and R5 form a voltage divider, preventing the output voltage of the voltage detection unit from being too high and causing the control module input terminal to be unable to accept a high voltage. When the fixed power supply has voltage output, the voltage detection unit has voltage output; when the fixed power supply does not have voltage output, the voltage detection unit does not have voltage output. This achieves the detection of whether the fixed power supply has voltage output.

[0027] The current limiting unit includes a diode D1. The anode of diode D1 is the input terminal of the current limiting unit, and the cathode of diode D1 is the output terminal of the current limiting unit. The main function of diode D1 is to limit the direction of current.

[0028] The first buck regulator unit includes a buck regulator chip U1 and a capacitor C1. The input terminal of the buck regulator chip U1 is the input terminal of the first buck regulator unit, and the output terminal of the buck regulator chip U1 is the output terminal of the first buck regulator unit. The output terminal of the buck regulator chip U1 is connected to the positive terminal of the capacitor C1, and the negative terminal of the capacitor C1 is grounded. The buck regulator chip U1 is an MD5336 chip.

[0029] The second buck regulator unit includes a buck regulator chip U2 and a capacitor C2. The input terminal of the buck regulator chip U2 is the input terminal of the second buck regulator unit, and the output terminal of the buck regulator chip U2 is the output terminal of the second buck regulator unit. The output terminal of the buck regulator chip U2 is connected to the positive terminal of the capacitor C2, and the negative terminal of the capacitor C2 is grounded. The buck regulator chip U2 is an LM317 model chip.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A gas meter valve control circuit, characterized in that, include: Control module, valve control module, and power supply; The valve control module includes: a first controllable switch unit, a second controllable switch unit, a first controllable power supply unit, and a second controllable power supply unit. The high-voltage terminal of the first controllable switch unit is connected to the control terminal of the second controllable switch unit to form the first output terminal of the valve control module. The high-voltage terminal of the second controllable switch unit is connected to the control terminal of the first controllable switch unit to form the second output terminal of the valve control module. The first output terminal of the valve control module is connected to the first terminal of the valve's electrical coil, and the second output terminal of the valve control module is connected to the second terminal of the valve's electrical coil. The control terminal of the first controllable power supply unit is connected to the first output terminal of the control module. The power supply terminal of the first controllable power supply unit is powered by the first output terminal of the power supply. The output terminal of the first controllable power supply unit is connected to the control terminal of the first controllable switch unit. The control terminal of the second controllable power supply unit is connected to the second output terminal of the control module. The power supply terminal of the second controllable power supply unit is powered by the first output terminal of the power supply. The output terminal of the second controllable power supply unit is connected to the control terminal of the second controllable switch unit.

2. The gas meter valve control circuit according to claim 1, characterized in that, The power supply includes: a fixed power supply, a first buck regulator unit, and a second buck regulator unit. The positive terminal of the fixed power supply is connected to the input terminal of the first buck regulator unit, and the output terminal of the first buck regulator unit is connected to the input terminal of the second buck regulator unit. The output terminal of the first buck regulator unit is the first output terminal of the power supply, and the output terminal of the second buck regulator unit is the second output terminal of the power supply. The second output terminal of the power supply supplies power to the control module.

3. The gas meter valve control circuit according to claim 2, characterized in that, The power supply also includes a voltage detection unit, the input of which is connected to the positive terminal of the fixed power supply, and the output of which is connected to the input of the control module.

4. The gas meter valve control circuit according to claim 3, characterized in that, The power supply also includes a current limiting unit, the input of which is connected to the positive terminal of the fixed power supply, and the output of which is connected to the input of the first step-down voltage regulator unit.

5. The gas meter valve control circuit according to claim 4, characterized in that, Both the first controllable power supply unit and the second controllable power supply unit include: resistor R1, resistor R2, NPN transistor Q1, and NPN transistor Q2. The first end of resistor R1 is the control terminal of the first or second controllable power supply unit. The second end of resistor R1 is connected to the base of NPN transistor Q1. The emitter of NPN transistor Q1 is grounded. The collector of NPN transistor Q1 is connected to the first end of resistor R2. The second end of resistor R2 is connected to the base of NPN transistor Q2. The collector of NPN transistor Q2 is the output terminal of the first or second controllable power supply unit. The emitter of NPN transistor Q2 is connected to the first terminal of the power supply.

6. The gas meter valve control circuit according to claim 5, characterized in that, Both the first and second controllable switching units include: a resistor R3 and an NPN transistor Q3. The first end of the resistor R3 is the control terminal of the first or second controllable switching unit, the second end of the resistor R3 is connected to the base of the NPN transistor Q3, the emitter of the NPN transistor Q3 is grounded, and the collector of the NPN transistor Q3 is the high-voltage terminal of the first or second controllable switching unit.

7. The gas meter valve control circuit according to any one of claims 3-6, characterized in that, The voltage detection unit includes resistors R4 and R5. The first end of resistor R4 is the input terminal of the voltage detection unit, the second end of resistor R4 is grounded through resistor R5, and the second end of resistor R4 is the output terminal of the voltage detection unit.

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