A direct current water pump driving circuit and air conditioner

Abstract

The application discloses a direct-current water pump driving circuit and an air conditioner. The direct-current water pump driving circuit comprises a driving module, a feedback module and a controller. The driving module is used for being connected with a direct-current water pump and driving the direct-current water pump to operate according to a control signal. The feedback module is connected with the direct-current water pump and is used for outputting a feedback signal according to an operating state of the direct-current water pump. The controller is used for outputting an adjusting signal to the driving module when a duty cycle of the feedback signal is less than a preset value, and adjusting a driving current and a driving voltage of the driving module to adapt to the direct-current water pump, so as to improve the compatibility of the direct-current water pump driving circuit and the reliability of the air conditioner.

Description

Technical Field

[0001] This application relates to the field of electronic technology, specifically to a DC water pump drive circuit and an air conditioner. Background Technology

[0002] With the increasing demand for energy conservation, environmental protection, and intelligent technology in the air conditioning industry, DC water pumps, with their high efficiency, reliability, and flexibility, have become an important component of modern air conditioning systems and are widely used in residential, commercial, and industrial air conditioning fields.

[0003] For a DC water pump to operate normally, two conditions must be met: 1. The input voltage must be within the rated voltage range; 2. The input current must be greater than the minimum rated current. However, in practical applications, it has been found that when the usage scenario or air conditioning unit configuration changes, the DC water pump model needs to be replaced. Since different DC water pumps require different input voltages and currents, directly replacing the DC water pump will not result in normal operation. It is necessary to modify the output voltage divider resistor of the DC water pump interface circuit on the air conditioning mainboard to change the output voltage and current of the mainboard (i.e., the input voltage and current of the DC water pump), enabling the replaced DC water pump to operate normally. Each time the DC water pump is replaced, the air conditioning mainboard also needs to be modified accordingly, resulting in low compatibility with the air conditioner.

[0004] Therefore, the technology still needs to be improved and enhanced. Utility Model Content

[0005] This application provides a DC water pump drive circuit and an air conditioner, which can alleviate the problem of low compatibility in current air conditioners where the control motherboard needs to be replaced simultaneously after replacing the DC water pump.

[0006] This application provides a DC water pump drive circuit, which includes:

[0007] The drive module is used to connect to the DC water pump and drive the DC water pump to operate according to the control signal;

[0008] The feedback module is connected to the DC water pump and is used to output feedback signals based on the operating status of the DC water pump.

[0009] The controller outputs an adjustment signal to the drive module when the duty cycle of the feedback signal is less than a preset value, thereby adjusting the drive current and drive voltage of the drive module to adapt to the DC water pump.

[0010] In some embodiments of the DC water pump drive circuit, the drive module includes a first input filter unit, a drive unit and an adjustment unit. The drive unit is connected to the adjustment unit and the first input filter unit respectively. The first input filter unit is also connected to the controller. The adjustment unit is connected to the DC water pump and the controller.

[0011] The first input filtering unit is used to filter the control signal output by the controller and then output it to the drive unit; the drive unit is used to provide drive current and drive voltage to the DC water pump according to the control signal; the adjustment unit is used to adjust the magnitude of drive current and drive voltage according to the adjustment signal to adapt to the DC water pump.

[0012] In some embodiments of the DC water pump drive circuit, the feedback module includes a second input filter unit, a feedback unit, and an output filter unit. The second input filter unit is connected to the DC water pump, the feedback unit is connected to both the second input filter unit and the output filter unit, and the output filter unit is also connected to the controller.

[0013] The feedback unit is used to input the operating status signal of the DC water pump through the second input filter unit, and output a feedback signal through the output filter unit according to the operating status signal.

[0014] In some embodiments of the DC water pump drive circuit, the drive unit includes a first optocoupler and a first resistor. The first pin of the first optocoupler is connected to the controller, the second pin of the first optocoupler is grounded, the third pin of the first optocoupler is connected to the adjustment unit, the fourth pin of the first optocoupler is energized, one end of the first resistor is connected to the third pin of the first optocoupler, and the other end of the first resistor is grounded.

[0015] In some embodiments of the DC water pump drive circuit, the adjustment unit includes an adjustable resistor, one end of which is connected to pin 3 of the first optocoupler, the other end of which is connected to the DC water pump, and the adjustable end of the adjustable resistor is connected to the controller.

[0016] In some embodiments of the DC water pump drive circuit, the first input filter unit includes a second resistor and a first capacitor. One end of the second resistor is connected to the controller, the other end of the first resistor is connected to pin 1 of the first optocoupler, one end of the first capacitor is connected to the other end of the first resistor, and the other end of the first capacitor is grounded.

[0017] In some embodiments of the DC water pump drive circuit, the feedback unit includes a third resistor, a fourth resistor, a fifth resistor, and a second optocoupler. One end of the fourth resistor is connected to the DC water pump, and the other end of the fourth resistor is connected to pin 1 of the second optocoupler. One end of the third resistor is connected to one end of the fourth resistor, and the other end of the third resistor is grounded. Pin 2 of the second optocoupler is grounded, pin 3 of the second optocoupler is grounded, pin 4 of the second optocoupler is connected to the controller, one end of the fifth resistor is connected to pin 4 of the second optocoupler, and the other end of the fifth resistor is energized.

[0018] In some embodiments of the DC water pump drive circuit, the second input filter unit includes a second capacitor, one end of which is connected to one end of a fourth resistor, and the other end of which is grounded.

[0019] In some embodiments of the DC water pump drive circuit, the output filter unit includes a sixth resistor and a third capacitor. One end of the sixth resistor is connected to pin 4 of the second optocoupler, and the other end of the sixth resistor is connected to the controller. One end of the third capacitor is connected to the other end of the sixth resistor, and the other end of the third capacitor is grounded.

[0020] This application also provides an air conditioner, which includes a DC water pump and a DC water pump drive circuit as described above.

[0021] This application provides a DC water pump drive circuit and an air conditioner. In the DC water pump drive circuit, a drive module drives the DC water pump to operate, and a feedback module obtains the operating status of the DC water pump. If the drive current and drive voltage are mismatched with the DC water pump, causing abnormal operation of the DC water pump, the controller can directly adjust the drive current and drive voltage of the drive module according to the feedback signal to achieve adaptive matching. This does not require replacing the main control board when replacing the DC water pump, which can improve the compatibility of the drive circuit and thus improve the reliability of the air conditioner. Attached Figure Description

[0022] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0023] Figure 1 This is a structural block diagram of a DC water pump drive circuit provided in an embodiment of this application.

[0024] Figure 2 This is a structural block diagram of the drive module and feedback module in the DC water pump drive circuit provided in the embodiments of this application.

[0025] Figure 3 The circuit structure diagram of the drive module and feedback module in the DC water pump drive circuit provided in the embodiment of this application is shown.

[0026] Figure 4 This is a schematic diagram of the interface of the controller in the DC water pump drive circuit provided in the embodiments of this application. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0028] Furthermore, the terms "first" and "second" 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 indicated. Features thus defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0029] Please see Figure 1 This application provides a DC water pump drive circuit, which includes a drive module 10, a feedback module 20, and a controller 30. Both the drive module 10 and the feedback module 20 are connected to the controller 30, and both are also used to connect to a DC water pump 50. This embodiment includes a connection port 40 for connecting to the DC water pump 50, and both the drive module 10 and the feedback module 20 are connected to the DC water pump 50 through the connection port 40.

[0030] In a specific embodiment, the controller 30 outputs a control signal to the drive module 10, which drives the DC water pump 50 to operate according to the control signal. During operation, the DC water pump 50 outputs a feedback signal to the controller 30 through the feedback module 20 via the connection port 40. Specifically, the feedback module 20 outputs the feedback signal according to the operating status of the DC water pump 50, and the controller 30 outputs an adjustment signal to the drive module 10 when the duty cycle of the feedback signal is less than a preset value, adjusting the drive current and drive voltage of the drive module 10 to adapt to the DC water pump 50 and ensure the normal operation of the DC water pump 50.

[0031] Different models of DC water pumps 50 require different drive currents and drive voltages. When the duty cycle of the feedback signal is less than the preset value, it indicates that the DC water pump drive circuit cannot operate normally under the current drive current and drive voltage. Therefore, the controller 30 will output an adjustment signal to the drive module 10 based on the feedback signal to adjust the drive current and drive voltage, enabling the DC water pump 50 to operate normally. If different models of DC water pumps 50 are set, and the drive module 10 drives the DC water pump 50, and the feedback module 20 obtains the operating status of the DC water pump 50, if a mismatch between the drive current and drive voltage and the DC water pump 50 causes abnormal operation, the controller 30 can directly adjust the drive current and drive voltage of the drive module 10 based on the feedback signal to achieve adaptive matching. This eliminates the need to replace the main control board when replacing the DC water pump 50, allowing the DC water pump 50 to be used in air conditioners, thus improving the compatibility of the air conditioner.

[0032] Please see Figure 2In some embodiments, the drive module 10 includes a first input filtering unit 11, a drive unit 12, and an adjustment unit 13. The drive unit 12 is connected to the adjustment unit 13 and the first input filtering unit 11, respectively. The first input filtering unit 11 is also connected to the controller 30. The adjustment unit 13 is connected to the DC water pump 50 and the controller 30.

[0033] The first input filtering unit 11 filters the control signal output by the controller 30 and outputs it to the drive unit 12. The drive unit 12 provides drive current and drive voltage to the DC water pump 50 according to the control signal. The adjustment unit 13 adjusts the magnitude of the drive current and drive voltage according to the adjustment signal to adapt to the DC water pump 50. In this embodiment, by setting the adjustment unit 13, the magnitude of the drive current and drive voltage can be controlled according to the input adjustment signal. When the DC water pump drive circuit is connected to different DC water pumps 50, it can adapt to the corresponding drive current and drive voltage, ensuring the normal operation of the DC water pump 50, thereby improving the compatibility of the drive circuit.

[0034] In some embodiments, the feedback module 20 includes a second input filtering unit 21, a feedback unit 22, and an output filtering unit 23. The second input filtering unit 21 is connected to the DC water pump 50. The feedback unit 22 is connected to the second input filtering unit 21 and the output filtering unit 23 respectively. The output filtering unit 23 is also connected to the controller 30.

[0035] The feedback unit 22 is used to input the operating status signal of the DC water pump 50 through the second input filtering unit 21, and output a feedback signal through the output filtering unit 23 according to the operating status signal. During operation, the DC water pump 50 feeds back operating status signals, such as square wave signals formed by high and low level signals, through the connection interface. After the second input filtering unit 21 filters the square wave signal, it is output through the feedback unit 22. After the feedback unit 22 outputs the signal, it is again alkaline filtered by the output filtering unit 23 to provide a feedback signal to the controller 30, thereby improving the stability and reliability of the feedback signal.

[0036] Please refer to the following: Figure 3 and Figure 4In one embodiment, the drive unit 12 includes a first optocoupler PC1 and a first resistor R1. Pin 1 of the first optocoupler PC1 is connected to the controller 30 (in this embodiment, the PWM signal terminal), pin 2 of the first optocoupler PC1 is grounded, pin 3 of the first optocoupler PC1 is connected to the adjustment unit 13, and pin 4 of the first optocoupler PC1 is energized. One end of the first resistor R1 is connected to pin 3 of the first optocoupler PC1, and the other end of the first resistor R1 is grounded. The first resistor R1 is a pull-down resistor, and the first optocoupler PC1 provides electrical isolation, which improves circuit safety. The controller 30 controls the switching on or off of the first optocoupler PC1 to provide a drive signal to the DC water pump 50, thereby controlling the start and stop of the DC water pump 50.

[0037] In one embodiment, the adjustment unit 13 includes an adjustable resistor RK. One end of the adjustable resistor RK is connected to pin 3 of the first optocoupler PC1, and the other end of the adjustable resistor RK is connected to the DC water pump 50. The adjustable end of the adjustable resistor RK is connected to the controller 30 (K signal terminal in this embodiment). When the duty cycle of the feedback signal is less than a preset value, for example, when the preset value is 25%, the duty cycle of the feedback signal of the DC water pump 50 is 30% to 90% during normal operation. When the duty cycle of the feedback signal is less than 25%, it indicates that the DC water pump 50 cannot operate. At this time, the controller 30 adjusts the resistance value of the adjustable resistor RK, thereby adjusting the magnitude of the drive current and drive voltage.

[0038] In one embodiment, the first input filtering unit 11 includes a second resistor R2 and a first capacitor C1. One end of the second resistor R2 is connected to the controller 30, the other end of the first resistor R1 is connected to pin 1 of the first optocoupler PC1, one end of the first capacitor C1 is connected to the other end of the first resistor R1, and the other end of the first capacitor C1 is grounded. In this embodiment, the second resistor R2 is a current-limiting resistor, and the first capacitor C1 is used to filter the input control signal to improve the stability and reliability of the control signal.

[0039] In one embodiment, the feedback unit 22 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a second optocoupler PC2. One end of the fourth resistor R4 is connected to the DC water pump 50, and the other end of the fourth resistor R4 is connected to pin 1 of the second optocoupler PC2. One end of the third resistor R3 is connected to one end of the fourth resistor R4, and the other end of the third resistor R3 is grounded. Pins 2 and 3 of the second optocoupler PC2 are grounded, and pin 4 of the second optocoupler PC2 is connected to the controller 30. One end of the fifth resistor R5 is connected to pin 4 of the second optocoupler PC2, and the other end of the fifth resistor R5 is energized. The third resistor R3 is a pull-down resistor, the fourth resistor R4 is a current-limiting resistor, and the fifth resistor R5 is a pull-up resistor. The operating status signal output from the connection interface controls the on / off state of the second optocoupler PC2 to output a feedback signal with a certain duty cycle to the controller 30, so that the controller 30 can determine the operating state of the DC water pump 50 based on the feedback signal.

[0040] In one embodiment, the second input filtering unit 21 includes a second capacitor C2, one end of which is connected to one end of a fourth resistor R4, and the other end of which is grounded. The second capacitor C2 filters the signal input to the second optocoupler PC2 to ensure the stability of the input signal.

[0041] In one embodiment, the output filtering unit 23 includes a sixth resistor R6 and a third capacitor C3. One end of the sixth resistor R6 is connected to pin 4 of the second optocoupler PC2, and the other end of the sixth resistor R6 is connected to the controller 30 (in this embodiment, the FG feedback signal). One end of the third capacitor C3 is connected to the other end of the sixth resistor R6, and the other end of the third capacitor C3 is grounded. The sixth resistor R6 is a current-limiting resistor, and the third capacitor C3 is a filtering capacitor. The output signal of the second optocoupler PC2 is filtered by the third capacitor C3, thereby improving the stability of the feedback signal.

[0042] Please continue reading. Figure 3 In this application, the DC water pump drive circuit uses a controller 30 to output a control signal to control the operation of the DC water pump 50, and a feedback module 20 outputs a feedback signal to determine the operating status of the DC water pump 50. When the duty cycle of the feedback signal is less than a preset value, it indicates that the DC water pump 50 is operating abnormally. The controller 30 can then adjust the resistance value of the adjustable resistor RK to change the drive current and drive voltage. Specifically, the drive voltage is denoted as Is, and the drive voltage is denoted as Us. If the voltage drop of the first optocoupler PC1 is ignored, Is = VCC2 / (R0 + Rk), where R0 is the resistance value of the DC water pump 50, Rk is the resistance value of the adjustable resistor RK, and Uk = Is * Rk. S =VCC2-U KUk is the voltage drop across the adjustable resistor RK. For the DC water pump 50 to operate normally, U0 ≤ Uk must be satisfied. S ≤U1 and I S ≥I min U0~U1 is the rated voltage range of the DC water pump 50; I min The minimum rated current I of the DC water pump 50 min By adjusting the resistance value of the adjustable resistor RK through the adjustment signal, the magnitudes of the drive current Is and the drive voltage Us can be changed, thereby adapting to the corresponding DC water pump 50. This allows the drive circuit to be adapted to various types of DC water pumps 50, thus improving the compatibility of the DC water pump drive circuit.

[0043] This application also provides an air conditioner that includes the DC water pump drive circuit described above. Since the DC water pump drive circuit has been described in detail above, it will not be repeated here.

[0044] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0045] The DC water pump drive circuit provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A DC water pump drive circuit, characterized in that, The DC water pump drive circuit includes: A drive module is provided, which is used to connect to a DC water pump and drive the DC water pump to operate according to a control signal. A feedback module is connected to the DC water pump and is used to output a feedback signal according to the operating status of the DC water pump. The controller is configured to output an adjustment signal to the drive module when the duty cycle of the feedback signal is less than a preset value, thereby adjusting the drive current and drive voltage of the drive module to adapt to the DC water pump.

2. The DC water pump drive circuit according to claim 1, characterized in that, The drive module includes a first input filtering unit, a drive unit, and an adjustment unit. The drive unit is connected to the adjustment unit and the first input filtering unit, respectively. The first input filtering unit is also connected to the controller. The adjustment unit is connected to the DC water pump and the controller. The first input filtering unit is used to filter the control signal output by the controller and then output it to the drive unit; The drive unit is used to provide the drive current and the drive voltage to the DC water pump according to the control signal; the adjustment unit is used to adjust the magnitude of the drive current and the drive voltage according to the adjustment signal to adapt to the DC water pump.

3. The DC water pump drive circuit according to claim 2, characterized in that, The feedback module includes a second input filtering unit, a feedback unit, and an output filtering unit. The second input filtering unit is connected to the DC water pump. The feedback unit is connected to both the second input filtering unit and the output filtering unit. The output filtering unit is also connected to the controller. The feedback unit is used to input the operating status signal of the DC water pump through the second input filtering unit, and output the feedback signal through the output filtering unit according to the operating status signal.

4. The DC water pump drive circuit according to claim 2, characterized in that, The driving unit includes a first optocoupler and a first resistor. Pin 1 of the first optocoupler is connected to the controller, pin 2 of the first optocoupler is grounded, pin 3 of the first optocoupler is connected to the adjustment unit, pin 4 of the first optocoupler is energized, one end of the first resistor is connected to pin 3 of the first optocoupler, and the other end of the first resistor is grounded.

5. The DC water pump drive circuit according to claim 4, characterized in that, The adjustment unit includes an adjustable resistor, one end of which is connected to pin 3 of the first optocoupler, the other end of which is connected to the DC water pump, and the adjustable end of which is connected to the controller.

6. The DC water pump drive circuit according to claim 5, characterized in that, The first input filtering unit includes a second resistor and a first capacitor. One end of the second resistor is connected to the controller, the other end of the first resistor is connected to pin 1 of the first optocoupler, one end of the first capacitor is connected to the other end of the first resistor, and the other end of the first capacitor is grounded.

7. The DC water pump drive circuit according to claim 3, characterized in that, The feedback unit includes a third resistor, a fourth resistor, a fifth resistor, and a second optocoupler. One end of the fourth resistor is connected to the DC water pump, and the other end of the fourth resistor is connected to pin 1 of the second optocoupler. One end of the third resistor is connected to one end of the fourth resistor, and the other end of the third resistor is grounded. Pin 2 of the second optocoupler is grounded, pin 3 of the second optocoupler is grounded, and pin 4 of the second optocoupler is connected to the controller. One end of the fifth resistor is connected to pin 4 of the second optocoupler, and the other end of the fifth resistor is energized.

8. The DC water pump drive circuit according to claim 7, characterized in that, The second input filter unit includes a second capacitor, one end of which is connected to one end of the fourth resistor, and the other end of which is grounded.

9. The DC water pump drive circuit according to claim 8, characterized in that, The output filtering unit includes a sixth resistor and a third capacitor. One end of the sixth resistor is connected to pin 4 of the second optocoupler, and the other end of the sixth resistor is connected to the controller. One end of the third capacitor is connected to the other end of the sixth resistor, and the other end of the third capacitor is grounded.

10. An air conditioner, characterized in that, The air conditioner includes a DC water pump and a DC water pump drive circuit as described in any one of claims 1-9.

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