Valve opening control circuit

Abstract

The utility model discloses a valve opening control circuit which comprises a power supply circuit, and a reflection switch circuit, a pulse shaping circuit, an MCU (Microprogrammed Control Unit) main control circuit, an in-place sensor, a motor driving circuit and a direct-current brush motor which are all connected with the power supply circuit, a rear shaft of the direct-current brush motor is provided with a disc with a reflective area and a non-reflective area, and the upper portion of the end face of a reflective switch in the reflective switch circuit is close to the edge of the disc. During working, through acquisition control of the in-place sensor and the MCU, the total number of motor operation pulses from full opening to full closing or from full closing to full opening of the valve is firstly acquired, and then the number of motor operation pulses required by an opening gear is calculated according to the total opening gear requirement of the valve; accurate control of each opening degree is achieved by collecting the number of rotation turns of the motor and controlling the motor through the MCU.

Description

Technical Field

[0001] The utility model belongs to the technical field of valve control and specifically relates to a valve opening control circuit. Background Art

[0002] In heating, intelligent valve throttling and hydraulic balance adjustment are used to eliminate the imbalance of water conservancy in the second network and uneven heating and cooling. The current 100-level opening control achieved by stepper motors is costly and complex to control.

[0003] Considering actual use requirements and cost, brushed DC motors are currently commonly used to achieve precise control of valve opening. Brushed DC motors are much cheaper than stepper motors and have simpler control and circuits. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the valve opening control circuit provided by the present invention adopts a DC brush motor to realize valve opening control, thereby reducing costs, improving the precise control of valve opening, and enhancing the market competitiveness of the product.

[0005] In order to achieve the above-mentioned purpose of the utility model, the technical solution adopted by the utility model is: a valve opening control circuit, including a power supply circuit, and a reflection switch circuit, a pulse shaping circuit, an MCU main control circuit, an in-position sensor, a motor drive circuit and a DC brush motor connected to the power supply circuit;

[0006] The reflective switch circuit, the pulse shaping circuit, the MCU main control circuit, the motor drive circuit and the DC brush motor are connected in sequence, and the MCU main control circuit is also connected to the in-position sensor and the DC brush motor respectively;

[0007] A disc with reflective and non-reflective areas is mounted on the rear shaft of the DC brushed motor, and an end surface of the reflective switch in the reflective switch circuit is located near an edge of the disc.

[0008] Furthermore, the reflective area and the non-reflective area on the disk are alternately arranged, and there is at least one reflective area and non-reflective area.

[0009] Furthermore, the reflective switch is an infrared reflective switch device.

[0010] The beneficial effect of the above further solution is: by setting an infrared reflection switch, the number of motor revolutions is collected, and the number of motor revolutions information is given to the main control MCU circuit structure.

[0011] Furthermore, the position sensor includes an open position sensor and a closed position sensor fixed on the valve body gear box.

[0012] The beneficial effect of the above further solution is that the main control MCU circuit obtains the position information of the motor limit rod by providing the position sensor.

[0013] Furthermore, the power supply circuit includes a chip U9 with a model number of ME3116AM6G and a chip U10 with a model number of MD7218A33PA1;

[0014] The VIN pin of the chip U9 is respectively connected to one end of the resistor R36, the grounded capacitor C14, and the grounded capacitor E3 via the cathode of the diode D7. The cathode of the diode D7 is respectively connected to one end of the fuse F1 and one end of the Zener diode D3. The other end of the Zener diode D3 is grounded. The other end of the fuse F1 is connected to the input power supply voltage +Vin. The other end of the resistor R36 is connected to the EN pin of the chip U9.

[0015] The BS pin of the chip U9 is connected to one end of the capacitor C10, and the other end of the capacitor C10 is respectively connected to the cathode of the diode D1, the SW pin of the chip U9, and one end of the inductor L1. The anode of the diode D1 is grounded, and the other end of the inductor L1 is respectively connected to one end of the resistor R37, the grounded capacitor C19, the grounded capacitor C18, the grounded capacitor C24, the voltage +VFM, and the Vin pin of the chip U10. The other end of the resistor R37 is respectively connected to the FB pin of the chip U0 and the grounded resistor R38;

[0016] The Vout pin of the chip U10 is connected to the grounding capacitor C17, the grounding capacitor C22 and the grounding capacitor C31 respectively, and outputs a +3.3V voltage;

[0017] The GND pins of the chip U9 and the chip U10 are both grounded.

[0018] The beneficial effect of the above further solution is: multiple point clouds are output through the above power supply circuit structure to power the system, thereby meeting the basic power supply requirements of the system.

[0019] Furthermore, the motor drive circuit includes a chip U7 of model PT2466;

[0020] The VM pin of the chip U7 is connected to the ground capacitor C15 and the voltage +VFM respectively;

[0021] A DC brushed motor M is connected between the M-pin and the M+ pin of the chip U7;

[0022] The GND pin of the chip U7 is connected to one end of the grounding resistor R34 and the resistor R33 respectively, and the other end of the resistor R33 is connected to the grounding capacitor C9 and is connected to the main control chip in the MCU main control circuit;

[0023] The VCC pin of the chip U7 is connected to the +3.3V voltage and the ground capacitor C8 respectively;

[0024] The nSLEEP pin, IN1 pin and IN2 pin of the chip U7 are all connected to the main control chip in the MCU main control circuit.

[0025] The beneficial effect of the above further solution is: by setting the above driving circuit structure, the motor is driven under the control of the main control MCU circuit, thereby controlling the valve opening.

[0026] Furthermore, the reflective switch circuit includes a switch reflector U6 of model ZOS-R3227-S17-TR8;

[0027] The first pin of the switch reflector U6 is connected to the main control chip of the MCU main control circuit, and the second pin is connected to one end of the resistor R20, and the other end of the resistor R20 is connected to the +3.3V voltage;

[0028] The third pin of the switch reflector U6 is connected to one end of the resistor R26 and serves as the output end of the reflective switch circuit. The other end of the resistor R26 is connected to a +3.3V voltage. The fourth pin of the switch reflector U6 is grounded.

[0029] Furthermore, the reflective switch circuit includes a switch reflector U6 of model ZOS-R3227-S17-TR8;

[0030] The +IN pin of the chip U14 is connected to the ground capacitor C39 and one end of the resistor R53 respectively, and the other end of the resistor R53 is connected to the other end of the resistor R26;

[0031] The V- pin of the chip U14 is grounded;

[0032] The -IN pin of the chip U14 is connected to the ground resistor R58, the ground capacitor C30 and one end of the resistor R54 respectively, and the other end of the resistor R54 is connected to the +3.3V voltage;

[0033] The V+ pin of the chip U14 is connected to the ground resistor C29, one end of the resistor R45 and the +3.3V voltage respectively;

[0034] The OUT pin of the chip U14 is connected to the other end of the resistor R45 and the main control chip in the MCU main control circuit respectively.

[0035] The beneficial effect of the above further solution is: through the coordinated work of the reflection switch circuit and the pulse shaping circuit, the motor rotation signal is collected and obtained, providing the required data for the signal processing of the main control MCU circuit.

[0036] Furthermore, the model of the main control chip U11 in the MCU main control circuit is FM33LG048.

[0037] The beneficial effects of the utility model are:

[0038] (1) This circuit structure uses a DC brush motor to achieve valve opening control, reducing costs, improving the precision of valve opening control, and enhancing the market competitiveness of the product.

[0039] (2) The circuit uses a switch reflector plus a pulse shaping control circuit, which increases the installation distance margin between the switch reflector and the disk, reduces the production assembly requirements, and improves production efficiency.

[0040] (3) The non-contact method is used to measure the number of revolutions of the motor, which is more reliable and has a longer service life.

[0041] (4) The switch reflector adopts a controllable power supply method, which supplies power when needed to increase the service life of the switch reflector.

[0042] (5) The circuit is simple and can be electrically controlled. It can be used in battery-powered products and other valve-controlled products. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a system block diagram of the valve opening control circuit provided by the utility model.

[0044] Figure 2 This is a schematic diagram of the power supply circuit provided by the utility model.

[0045] Figure 3 This is a schematic diagram of the motor drive circuit provided by the utility model.

[0046] Figure 4 This is a schematic diagram of the reflective switch circuit and pulse shaping circuit provided by the utility model.

[0047] Figure 5 This is the main control MCU circuit schematic provided by the utility model. DETAILED DESCRIPTION

[0048] The specific implementation methods of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific implementation methods. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all utility model creations using the concept of the present invention are protected.

[0049] The utility model provides a valve opening control circuit, such as Figure 1 As shown, it includes a power supply circuit, and a reflection switch circuit, a pulse shaping circuit, an MCU main control circuit, a position sensor, a motor drive circuit and a DC brush motor all connected to the power supply circuit;

[0050] The reflective switch circuit, the pulse shaping circuit, the MCU main control circuit, the motor drive circuit and the DC brush motor are connected in sequence, and the MCU main control circuit is also connected to the in-position sensor and the DC brush motor respectively;

[0051] A disc with reflective and non-reflective areas is mounted on the rear shaft of the DC brushed motor, and an end surface of the reflective switch in the reflective switch circuit is located near an edge of the disc.

[0052] In this embodiment, Figure 1 The reflective areas and the non-reflective areas on the disk are arranged alternately, and there is at least one reflective area and non-reflective area.

[0053] For example, Figure 1 The black area on the middle motor is a non-reflective area, and the white area is a reflective area. The number of the areas can be divided as needed, and there must be at least one.

[0054] In this embodiment, the reflective switch is an infrared reflective switch device, the end face of which is placed above the disk, close to the outer edge of the disk, and 1 to 3 mm away from the disk. The plastic disk is fixed on the rear shaft of the motor.

[0055] In this embodiment, the in-position sensor includes an open in-position sensor and a closed in-position sensor fixed on the valve body gear box; during operation, when the limit rod on the gear presses the spring piece of the in-position sensor when the valve is running, the in-position sensor closes and gives an in-position signal.

[0056] In this embodiment, if Figure 2 As shown, the power supply circuit includes a chip U9 with a model number of ME3116AM6G and a chip U10 with a model number of MD7218A33PA1;

[0057] The VIN pin of the chip U9 is respectively connected to one end of the resistor R36, the grounded capacitor C14, and the grounded capacitor E3 via the cathode of the diode D7. The cathode of the diode D7 is respectively connected to one end of the fuse F1 and one end of the Zener diode D3. The other end of the Zener diode D3 is grounded. The other end of the fuse F1 is connected to the input power supply voltage +Vin. The other end of the resistor R36 is connected to the EN pin of the chip U9.

[0058] The BS pin of the chip U9 is connected to one end of the capacitor C10, and the other end of the capacitor C10 is respectively connected to the cathode of the diode D1, the SW pin of the chip U9, and one end of the inductor L1. The anode of the diode D1 is grounded, and the other end of the inductor L1 is respectively connected to one end of the resistor R37, the grounded capacitor C19, the grounded capacitor C18, the grounded capacitor C24, the voltage +VFM, and the Vin pin of the chip U10. The other end of the resistor R37 is respectively connected to the FB pin of the chip U0 and the grounded resistor R38;

[0059] The Vout pin of the chip U10 is connected to the grounding capacitor C17, the grounding capacitor C22 and the grounding capacitor C31 respectively, and outputs a +3.3V voltage;

[0060] The GND pins of the chip U9 and the chip U10 are both grounded.

[0061] In this embodiment, Figure 2 In the power supply circuit shown, +Vin is the 24V DC power supply from a power supply. U1 is a dedicated DC / DC step-down converter chip, outputting 3.7V (+VFM) to power the valve drive circuit and the +3.3V output LDO. U10 is a low-dropout LDO, outputting +3.3V to power the main control circuit, the reflective switch circuit, the pulse shaping circuit, and the brushed DC motor drive circuit.

[0062] In this embodiment, the motor drive circuit is implemented using a dedicated driver chip for a DC brushed motor, and the start and stop of the motor are controlled by the MCU main control circuit. Figure 3 As shown, the motor drive circuit in this embodiment includes a chip U7 of model PT2466;

[0063] The VM pin of the chip U7 is connected to the ground capacitor C15 and the voltage +VFM respectively;

[0064] A DC brushed motor M is connected between the M-pin and the M+ pin of the chip U7;

[0065] The GND pin of the chip U7 is connected to one end of the grounding resistor R34 and the resistor R33 respectively, and the other end of the resistor R33 is connected to the grounding capacitor C9 and is connected to the main control chip in the MCU main control circuit;

[0066] The VCC pin of the chip U7 is connected to the +3.3V voltage and the ground capacitor C8 respectively;

[0067] The nSLEEP pin, IN1 pin and IN2 pin of the chip U7 are all connected to the main control chip in the MCU main control circuit.

[0068] In this embodiment, if Figure 4As shown, the reflective switch circuit includes a switch reflector U6 of model ZOS-R3227-S17-TR8;

[0069] The first pin of the switch reflector U6 is connected to the main control chip of the MCU main control circuit, and the second pin is connected to one end of the resistor R20, and the other end of the resistor R20 is connected to the +3.3V voltage;

[0070] The third pin of the switch reflector U6 is connected to one end of the resistor R26 and serves as the output end of the reflective switch circuit. The other end of the resistor R26 is connected to a +3.3V voltage. The fourth pin of the switch reflector U6 is grounded.

[0071] In this embodiment, if Figure 4 As shown, the pulse shaping control circuit includes a chip U14 of model RS331XF;

[0072] The +IN pin of the chip U14 is connected to the ground capacitor C39 and one end of the resistor R53 respectively, and the other end of the resistor R53 is connected to the other end of the resistor R26;

[0073] The V- pin of the chip U14 is grounded;

[0074] The -IN pin of the chip U14 is connected to the ground resistor R58, the ground capacitor C30 and one end of the resistor R54 respectively, and the other end of the resistor R54 is connected to the +3.3V voltage;

[0075] The V+ pin of the chip U14 is connected to the ground resistor C29, one end of the resistor R45 and the +3.3V voltage respectively;

[0076] The OUT pin of the chip U14 is connected to the other end of the resistor R45 and the main control chip in the MCU main control circuit respectively.

[0077] In this embodiment, Figure 5 The MCU main control circuit shown completes signal acquisition and control processing, and its main control chip U11 is FM33LG048.

[0078] When the system is working, the motor drives the plastic disc to rotate. The reflective switch circuit detects the alternating changes of black and white stripes on the plastic disc, and outputs high (black stripes on the plastic disc) and low (white stripes on the rate disc) changing levels. The pulse shaping circuit forms a pulse signal, which is used to collect the number of motor revolutions for the MCU main control circuit. When the system is powered on, the in-place sensor and the MCU main control circuit collect and control the total number of motor pulses when the valve is fully open to fully closed or from fully closed to fully open. Then, according to the total opening gear requirement of the valve, the number of motor pulses required for an opening gear is calculated. The MCU collects the number of motor revolutions and controls the motor to achieve precise control of each opening.

[0079] In the description of the present invention, it should be understood that the terms "center," "thickness," "upper," "lower," "horizontal," "top," "bottom," "inner," "outer," "radial," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Therefore, features defined by "first," "second," and "third" may explicitly or implicitly include one or more of such features.

[0080] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

[0081] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the scope of protection of the present invention is not limited to such specific descriptions and embodiments. Those skilled in the art can, based on the technical teachings disclosed in this utility model, make various other specific variations and combinations that do not depart from the essence of the present invention, and such variations and combinations are still within the scope of protection of the present invention.

Claims

1. A valve opening control circuit, characterized in that: It includes a power supply circuit, and a reflection switch circuit, a pulse shaping circuit, an MCU main control circuit, a position sensor, a motor drive circuit and a DC brush motor, all of which are connected to the power supply circuit; The reflective switch circuit, the pulse shaping circuit, the MCU main control circuit, the motor drive circuit and the DC brush motor are connected in sequence, and the MCU main control circuit is also connected to the in-position sensor and the DC brush motor respectively; A disc with reflective and non-reflective areas is mounted on the rear shaft of the DC brushed motor, and an end surface of the reflective switch in the reflective switch circuit is located near an edge of the disc.

2. The valve opening control circuit according to claim 1, characterized in that: The reflective area and the non-reflective area on the disk are alternately arranged, and there is at least one reflective area and non-reflective area.

3. The valve opening control circuit according to claim 1, characterized in that: The reflective switch is an infrared reflective switch device.

4. The valve opening control circuit according to claim 1, characterized in that: The in-position sensors include an open in-position sensor and a closed in-position sensor fixed on the valve body gear box.

5. The valve opening control circuit according to claim 1, characterized in that: The power supply circuit includes a chip U9 with a model number of ME3116AM6G and a chip U10 with a model number of MD7218A33PA1; The VIN pin of the chip U9 is respectively connected to one end of the resistor R36, the grounded capacitor C14, and the grounded capacitor E3 via the cathode of the diode D7. The cathode of the diode D7 is respectively connected to one end of the fuse F1 and one end of the Zener diode D3. The other end of the Zener diode D3 is grounded. The other end of the fuse F1 is connected to the input power supply voltage +Vin. The other end of the resistor R36 is connected to the EN pin of the chip U9. The BS pin of the chip U9 is connected to one end of the capacitor C10, and the other end of the capacitor C10 is respectively connected to the cathode of the diode D1, the SW pin of the chip U9, and one end of the inductor L1. The anode of the diode D1 is grounded, and the other end of the inductor L1 is respectively connected to one end of the resistor R37, the grounded capacitor C19, the grounded capacitor C18, the grounded capacitor C24, the voltage +VFM, and the Vin pin of the chip U10. The other end of the resistor R37 is respectively connected to the FB pin of the chip U0 and the grounded resistor R38; The Vout pin of the chip U10 is connected to the grounding capacitor C17, the grounding capacitor C22 and the grounding capacitor C31 respectively, and outputs a +3.3V voltage; The GND pins of the chip U9 and the chip U10 are both grounded.

6. The valve opening control circuit according to claim 5, characterized in that: The motor drive circuit includes a chip U7 of model PT2466; The VM pin of the chip U7 is connected to the ground capacitor C15 and the voltage +VFM respectively; A DC brushed motor M is connected between the M-pin and the M+ pin of the chip U7; The GND pin of the chip U7 is connected to one end of the grounding resistor R34 and the resistor R33 respectively, and the other end of the resistor R33 is connected to the grounding capacitor C9 and is connected to the main control chip in the MCU main control circuit; The VCC pin of the chip U7 is connected to the +3.3V voltage and the ground capacitor C8 respectively; The nSLEEP pin, IN1 pin and IN2 pin of the chip U7 are all connected to the main control chip in the MCU main control circuit.

7. The valve opening control circuit according to claim 5, characterized in that: The reflective switch circuit includes a switch reflector U6 of model ZOS-R3227-S17-TR8; The first pin of the switch reflector U6 is connected to the main control chip of the MCU main control circuit, and the second pin is connected to one end of the resistor R20, and the other end of the resistor R20 is connected to the +3.3V voltage; The third pin of the switch reflector U6 is connected to one end of the resistor R26 and serves as the output end of the reflective switch circuit. The other end of the resistor R26 is connected to a +3.3V voltage. The fourth pin of the switch reflector U6 is grounded.

8. The valve opening control circuit according to claim 7, characterized in that: The pulse shaping circuit includes a chip U14 of model RS331XF; The +IN pin of the chip U14 is connected to the ground capacitor C39 and one end of the resistor R53 respectively, and the other end of the resistor R53 is connected to the other end of the resistor R26; The V- pin of the chip U14 is grounded; The -IN pin of the chip U14 is connected to the ground resistor R58, the ground capacitor C30 and one end of the resistor R54 respectively, and the other end of the resistor R54 is connected to the +3.3V voltage; The V+ pin of the chip U14 is connected to the ground resistor C29, one end of the resistor R45 and the +3.3V voltage respectively; The OUT pin of the chip U14 is connected to the other end of the resistor R45 and the main control chip in the MCU main control circuit respectively.

9. The valve opening control circuit according to claim 1, characterized in that: The model of the main control chip U11 in the MCU main control circuit is FM33LG048.

Images