Direct-current water pump control circuit and air conditioner

Abstract

The utility model provides a direct-current water pump control circuit and an air conditioner, and relates to the technical field of air conditioners, the direct-current water pump control circuit comprises an identification module, a driving chip and a control module, the driving chip is electrically connected with the identification module and the control module, and the control module is further used for being connected with a direct-current water pump; wherein the identification module is used for acquiring the model of the direct-current water pump; the driving chip is used for determining corresponding driving parameters according to the model of the direct-current water pump and driving the control module to work according to the driving parameters so as to output corresponding driving current and driving voltage to the direct-current water pump through the control module. The direct-current water pump control circuit and the air conditioner have the advantages that the driving current and the driving voltage of the direct-current water pump can be automatically adjusted, and the labor cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and in particular to a DC water pump control circuit and an air conditioner. Background Art

[0002] When replacing the DC water pump of the air conditioner, the input voltage and minimum input current required by the water pump will be different due to different manufacturers and models.

[0003] At present, the DC water pump control circuit on the motherboard is not compatible. It is necessary to adjust the voltage and current output by the motherboard by adjusting the voltage-dividing resistor in series with the water pump to meet the input voltage and input current requirements of different water pumps. Whenever the DC water pump is replaced, the voltage-dividing resistor needs to be replaced, which requires a large labor cost.

[0004] In summary, the existing technology has the problem of high labor cost for replacing DC water pumps. Utility Model Content

[0005] The purpose of the present application is to provide a DC water pump control circuit and an air conditioner to solve the problem of high labor cost for replacing a DC water pump in the prior art.

[0006] To solve the above problems, this application provides the following technical solutions:

[0007] On the one hand, an embodiment of the present application provides a DC water pump control circuit, the DC water pump control circuit includes an identification module, a drive chip and a control module, the drive chip is electrically connected to the identification module and the control module, and the control module is also used to connect to the DC water pump; wherein,

[0008] The identification module is used to obtain the model of the DC water pump;

[0009] The driving chip is used to determine corresponding driving parameters according to the model of the DC water pump, and to drive the control module to work according to the driving parameters, so as to output corresponding driving current and driving voltage to the DC water pump through the control module.

[0010] The DC water pump control circuit provided in the present application can directly identify the model of the DC water pump through the identification module, and the driving chip selects the corresponding driving parameters according to the model of the DC water pump, and drives the control module to output the corresponding driving current and driving voltage to the DC water pump, thereby achieving the effect of automatically adjusting the driving current and driving voltage of the DC water pump when the DC water pump is replaced, eliminating the need to manually replace the voltage divider resistor, thereby reducing labor costs.

[0011] Optionally, the control module includes a drive unit, a switch unit and an output unit, the drive unit is electrically connected to the switch unit, and the output unit is connected to a first power supply through the switch unit, the drive unit and the output unit are also electrically connected to the drive chip, and the output unit is also electrically connected to the DC water pump; wherein,

[0012] The driving unit is used to control the switch unit to conduct when receiving the driving parameter;

[0013] The output unit is also used to output corresponding driving current and driving voltage to the DC water pump according to the driving parameters.

[0014] Optionally, the output unit includes a constant current source, a first resistor and a second resistor, one end of the constant current source connected in series with the first resistor is connected to the switch unit, and the other end is connected to the DC water pump, and the constant current source is also electrically connected to the drive chip; one end of the second resistor is connected to the switch unit, and the other end is grounded; wherein,

[0015] The constant current source is used to adjust the output current according to the driving parameter.

[0016] Optionally, the output unit further includes a first transient voltage suppression diode, one end of the first transient voltage suppression diode is connected to the first power supply, and the other end of the first transient voltage suppression diode is grounded.

[0017] Optionally, the output unit further includes a second transient voltage suppression diode, one end of the second transient voltage suppression diode is connected to the first resistor, and the other end of the second transient voltage suppression diode is grounded.

[0018] Optionally, the switch unit includes an optocoupler, the optocoupler includes a light emitting diode and a light receiving transistor, the light emitting diode is electrically connected to the driving unit, one end of the light receiving transistor is connected to the first power supply, and the other end is connected to the output unit.

[0019] Optionally, the driving unit includes a switching tube, a third resistor and a fourth resistor, the first end of the switching tube is connected to the second power supply through the third resistor, the second end is electrically connected to the switching unit, and the control end of the switching tube is connected to the driving chip through the fourth resistor.

[0020] Optionally, the switch tube includes an NPN transistor, a collector of the switch tube is connected to the second power supply through the third resistor, an emitter is electrically connected to the switch unit, and a base of the switch tube is connected to the driving chip through the fourth resistor.

[0021] Optionally, the identification module includes at least one of a jumper cap, a dial and a button, and when the identification module includes a jumper cap and a dial, the identification module is electrically connected to the DC water pump.

[0022] On the other hand, an embodiment of the present application further provides an air conditioner, which includes the above-mentioned DC water pump control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a module schematic diagram of the DC water pump control circuit provided in this application.

[0024] Figure 2 A circuit diagram of the control module provided in this application.

[0025] Description of reference numerals:

[0026] 110 - identification module; 120 - driving chip; 130 - control module; 131 - driving unit; 132 - switching unit; 133 - output unit. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0028] As described in the background technology, currently, there are many types of DC water pumps on the market, and the input voltage and input current requirements of different types of DC water pumps are different. When controlling the power supply voltage of the DC water pump, it is generally adjusted through a voltage divider resistor. Therefore, when a different type of DC water pump needs to be replaced, it is necessary to adjust the voltage and current output by the mainboard by adjusting the voltage divider resistor connected in series with the water pump.

[0029] For example, when the power supply voltage passes through the voltage divider resistor R1, the output voltage is 5V. At this time, if the rated voltage of the connected DC water pump A is 6V, the DC water pump A can operate normally. If DC water pump A needs to be replaced with DC water pump B, and the rated voltage of DC water pump B is 3V, then the voltage passing through the voltage divider resistor exceeds the rated voltage of DC water pump B, and DC water pump B cannot be directly connected. Instead, it is necessary to replace the voltage divider with a larger resistance value so that the voltage after passing through the voltage divider resistor is lower, for example, the output voltage is 2V, so that DC water pump B can operate normally. In this scenario, it is necessary to manually replace the low-resistance voltage divider resistor with a high-resistance voltage divider resistor, which increases the labor cost.

[0030] Alternatively, when the power supply voltage passes through the voltage divider resistor R1, the output voltage is 2V. At this time, if the rated voltage of the connected DC water pump A is 3V, the DC water pump A can operate normally. If DC water pump A needs to be replaced with DC water pump B, and the rated voltage of DC water pump B is 6V and the rated minimum voltage is 3V, then the voltage passing through the voltage divider resistor is lower than the rated minimum voltage of DC water pump B, and DC water pump B cannot be directly connected. Instead, it is necessary to replace the voltage divider with a smaller resistance value so that the voltage after passing through the voltage divider resistor is higher, for example, the output voltage is 5V, so that DC water pump B can operate normally. In this scenario, it is necessary to manually replace the high-resistance voltage divider resistor with a low-resistance voltage divider resistor, which will also increase the labor cost.

[0031] Therefore, in order to reduce labor costs, the present application provides a DC water pump control circuit, which adjusts the driving current and voltage output to the DC water pump by identifying the DC water pump model, thereby achieving the purpose of reducing labor costs.

[0032] The following is an exemplary description of the DC water pump control circuit provided in this application:

[0033] As an alternative implementation, see Figure 1 The DC water pump control circuit includes an identification module 110, a driving chip 120 and a control module 130. The driving chip is electrically connected to the identification module 110 and the control module 130 respectively, and the control module 130 is also used to connect to the DC water pump; wherein, the identification module 110 is used to obtain the model of the DC water pump; the driving chip 120 is used to determine the corresponding driving parameters according to the model of the DC water pump, and is used to drive the control module 130 to work according to the driving parameters, so as to output the corresponding driving current and driving voltage to the DC water pump through the control module 130.

[0034] The identification module 110 provided in the present application identifies the model of the DC water pump, and the driving chip 120 selects corresponding driving parameters according to the model of the DC water pump, and drives the control module 130 to output corresponding driving current and driving voltage to the DC water pump, thereby achieving the effect of automatically adjusting the driving current and driving voltage of the DC water pump when the DC water pump is replaced, eliminating the need to manually replace the voltage divider resistor, thereby reducing labor costs.

[0035] Among them, the identification module 110 provided in the present application includes at least one of a jumper cap, a dial and a button. When the identification module 110 is a button, the user can directly input the model of the DC water pump through the button. When the identification module 110 includes a jumper cap and a dial, the identification module 110 is electrically connected to the DC water pump. It should be noted that the jumper cap and the dial are both devices that can characterize the model of the DC water pump. When the DC water pump is powered on, the identification module 110 can determine the model of the DC water pump through the parameters of the jumper cap and the dial.

[0036] In addition, the drive parameters of different DC water pumps are pre-stored in the drive chip 120. It should be noted that the drive parameters are the operating parameters corresponding to each DC water pump determined after testing. It can be understood that each DC water pump corresponds to a specific drive parameter, and the number of DC water pumps commonly used is relatively small, so it is convenient to determine the drive parameters. For example, there are three commonly used DC water pumps, namely DC water pump X, DC water pump Y and DC water pump Z. The drive chip 120 needs to store the drive parameters corresponding to the DC water pump X, DC water pump Y and DC water pump Z. When the identification module 110 identifies that the currently working water pump is DC water pump Y, the drive parameter drive control module 130 corresponding to the DC water pump Y is called to work; if the identification module 110 identifies that the currently working water pump is DC water pump Z, the drive parameter drive control module 130 corresponding to the DC water pump Z is called to work, and so on.

[0037] As an implementation method, the driver chip 120 can use an MCU, which, after receiving the model of the DC water pump identified by the identification module 110, calls the corresponding driving parameters and drives the control module 130 to work. It should be noted that the present application does not limit the model of the driver chip 120, as long as the corresponding driving parameters can be determined according to the model of the DC water pump and the control module 130 can be driven to work. In addition, the driver chip 120 can also use devices such as FPGA, which is not limited here.

[0038] As an implementation method, the control module 130 includes a drive unit 131, a switch unit 132 and an output unit 133. The drive unit 131 is electrically connected to the switch unit 132, and the output unit 133 is connected to the first power supply through the switch unit 132. The drive unit 131 and the output unit 133 are also electrically connected to the drive chip 120, and the output unit 133 is also electrically connected to the DC water pump; wherein the drive unit 131 is used to control the switch unit 132 to be turned on when receiving the drive parameters; the output unit 133 is also used to output the corresponding drive current and drive voltage to the DC water pump according to the drive parameters.

[0039] Among them, the output unit 133 includes a constant current source, a first resistor R1 and a second resistor R2. One end of the constant current source connected in series with the first resistor R1 is connected to the switch unit 132, and the other end is connected to the DC water pump. The constant current source is also electrically connected to the driving chip 120; one end of the second resistor R2 is connected to the switch unit 132, and the other end is grounded; wherein the constant current source is used to adjust the output current according to the driving parameters.

[0040] That is, the output unit 133 includes two branches, one of which is the branch where the first resistor R1 and the constant current source are located, and the other branch is the branch where the second resistor R2 is located. The driving parameters of the driving signal include a signal for controlling the switch unit 132 to be turned on, and also include a signal for controlling the output current of the constant current source. When the switch unit 132 is turned on, the first power source flows to the two branches through the switch unit 132. The two branches are divided so that the current output from the branch where the constant current source is located to the DC water pump meets the requirements.

[0041] It should be noted that the DC water pump must meet two conditions to operate normally. The first condition is that the input voltage of the DC water pump meets its rated voltage range U0~U1; the second condition is that the input current of the DC water pump is greater than its minimum rated current Imin.

[0042] On this basis, the driver chip 120 numbers the DC water pumps in advance and stores their corresponding currents I. For example, the current of the X water pump is IX (the rated voltage of the X water pump is U0X~U1X, and the minimum rated current is IminX); the current of the Y water pump is IY (the rated voltage of the Y water pump is U0Y~U1Y, and the minimum rated current is IminY); the current of the Z water pump is IZ (the rated voltage of the Z water pump is U0Z~U1Z, and the minimum rated current is IminZ)..., the current IX needs to satisfy: (1) U1X>VCC2-IX*R1>U0X; (2) IX>IminX; the current IY needs to satisfy: (1) U1Y>VCC2-IY*R1>U0Y; (2) IY>IminY; the current IZ needs to satisfy: (1) U1Z>VCC2-IZ*R1>U0Z; (2) IZ>IminZ. That is, the current I must meet two conditions: (1) U1>VCC2-I*R1>U0; (represents the power supply voltage minus the voltage of the voltage divider resistor) (2) I>Imin.

[0043] Moreover, in order to prevent the situation that the device is damaged due to overvoltage, in the present application, the output unit 133 also includes a first transient voltage suppression diode, one end of the first transient voltage suppression diode is connected to the first power supply, and the other end is grounded. A transient voltage suppression diode (TVS tube) is an overvoltage protection device with bidirectional voltage stabilization characteristics and bidirectional negative resistance characteristics, similar to a varistor. It is used in various AC and DC power supply circuits to suppress instantaneous overvoltage. When a surge pulse voltage appears instantly in the protected circuit, the bidirectional breakdown diode can quickly break down by Zener, changing from a high resistance state to a low resistance state, shunting and clamping the surge voltage, thereby protecting the components in the circuit from being damaged by the instantaneous surge pulse voltage. In the present application, when the first transient voltage suppression diode is not broken down, it cannot flow current; and when the first transient voltage suppression diode is broken down, it becomes a low resistance state. Therefore, when the first power supply voltage is too large, the first transient voltage suppression diode will be broken down, so that the current flows directly to the ground without damaging the switch unit 132.

[0044] At the same time, the output unit 133 also includes a second transient voltage suppression diode, one end of the second transient voltage suppression diode is connected to the first resistor R1, and the other end is grounded. When the voltage input to the DC water pump is too large, the second transient voltage suppression diode will also be broken down, so that the current flows directly to the ground, protecting the DC water pump from damage due to overvoltage.

[0045] As an implementation method, the switch unit 132 includes an optocoupler, which includes a light-emitting diode and a light-receiving transistor. The light-emitting diode is electrically connected to the driving unit 131 , and one end of the light-receiving transistor is connected to the first power supply, and the other end is connected to the output unit 133 .

[0046] Of course, the switch unit 132 may also be other devices, for example, the switch unit 132 may be a triode, such as an NPN triode, and then when the triode is turned on, the power supply can supply power to the subsequent circuit. Alternatively, the switch unit 132 may be a relay, a MOS tube, etc., which are not limited here. Since the optocoupler device has an isolation characteristic, the present application uses an optocoupler device as the switch unit 132.

[0047] The driving unit 131 includes a switch tube, a third resistor R3 and a fourth resistor R4, wherein the first end of the switch tube is connected to the second power supply through the first resistor R1, the second end is electrically connected to the switch unit 132, and the control end of the switch tube is connected to the driving chip 120 through the fourth resistor R4. The third resistor R3 is used as a pull-up resistor, and the fourth resistor R4 is used as a current limiting resistor.

[0048] When the switch tube is an NPN transistor, the collector of the switch tube is connected to the second power supply through the first resistor R1, the emitter is electrically connected to the switch unit 132, and the base of the switch tube is connected to the driver chip 120 through the fourth resistor R4. Of course, the switch tube can also be a MOS tube, an IGBT tube, etc., which is not limited here.

[0049] When the driver chip 120 outputs a PWM control signal, the water pump is turned on, and when there is no PWM control signal, the water pump is turned off. The input voltage of the water pump is VCC2-I*R1 (the voltage drop of the optocoupler U1 is negligible at this time), and the input current of the water pump is I, where the voltage divider resistor R1 is selected so that the current I corresponding to all water pumps can meet the conditions of (1) U1>12-I*R1>U0; (2) I>Imin.

[0050] In addition, when the DC water pump needs to be replaced, the driver chip 120 will control the constant current source to output the smallest current I0 among IX, IY, IZ... to prevent the water pump from being damaged due to excessive input current when the main chip does not recognize the water pump in the initial state.

[0051] After outputting the minimum current I0, the DC water pump runs, and the identification module 110 periodically identifies the model of the DC water pump. Once the model of the DC water pump is changed, the constant current source is controlled to output the corresponding current I. For example, if it is identified as an X water pump, the constant current source is controlled to output the current IA; if it is identified as a Y water pump, the constant current source is controlled to output the current IB... At this time, the input voltage and input current of the water pump meet its requirements and will not cause damage. When the PWM has a control signal, the water pump can work normally.

[0052] In summary, the embodiment of the present application provides a DC water pump control circuit, which includes an identification module 110, a drive chip 120 and a control module 130, wherein the drive chip is electrically connected to the identification module 110 and the control module 130 respectively, and the control module 130 is also used to connect the DC water pump; wherein the identification module 110 is used to obtain the model of the DC water pump; the drive chip 120 is used to determine the corresponding drive parameters according to the model of the DC water pump, and is used to drive the control module 130 to work according to the drive parameters, so as to output the corresponding drive current and drive voltage to the DC water pump through the control module 130. The DC water pump control circuit provided by the present application can directly identify the model of the DC water pump through the identification module 110, and the drive chip 120 selects the corresponding drive parameters according to the model of the DC water pump, and drives the control module 130 to output the corresponding drive current and drive voltage to the DC water pump, so as to achieve the effect of automatically adjusting the drive current and drive voltage of the DC water pump when the DC water pump is replaced, so that there is no need to replace the voltage divider resistor manually, thereby reducing the labor cost.

[0053] Although the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application shall be subject to the scope defined by the claims.

Claims

1. A DC water pump control circuit, characterized in that: The DC water pump control circuit includes an identification module, a driving chip and a control module. The driving chip is electrically connected to the identification module and the control module respectively. The control module is also used to connect to the DC water pump; wherein, The identification module is used to obtain the model of the DC water pump; The driving chip is used to determine corresponding driving parameters according to the model of the DC water pump, and to drive the control module to work according to the driving parameters, so as to output corresponding driving current and driving voltage to the DC water pump through the control module.

2. The DC water pump control circuit according to claim 1, characterized in that: The control module includes a driving unit, a switch unit and an output unit, wherein the driving unit is electrically connected to the switch unit, and the output unit is connected to a first power supply through the switch unit, the driving unit and the output unit are also electrically connected to the driving chip, and the output unit is also electrically connected to the DC water pump; wherein, The driving unit is used to control the switch unit to conduct when receiving the driving parameter; The output unit is also used to output corresponding driving current and driving voltage to the DC water pump according to the driving parameters.

3. The DC water pump control circuit according to claim 2, characterized in that: The output unit comprises a constant current source, a first resistor and a second resistor, one end of the constant current source connected in series with the first resistor is connected to the switch unit, and the other end is connected to the DC water pump, and the constant current source is also electrically connected to the driving chip; One end of the second resistor is connected to the switch unit, and the other end is grounded; wherein, The constant current source is used to adjust the output current according to the driving parameter.

4. The DC water pump control circuit according to claim 3, characterized in that: The output unit further includes a first transient voltage suppression diode, one end of which is connected to the first power supply, and the other end of which is grounded.

5. The DC water pump control circuit according to claim 3, characterized in that: The output unit further includes a second transient voltage suppression diode, one end of the second transient voltage suppression diode is connected to the first resistor, and the other end of the second transient voltage suppression diode is grounded.

6. The DC water pump control circuit according to claim 2, characterized in that: The switch unit includes an optical coupler, and the optical coupler includes a light emitting diode and a light receiving transistor. The light emitting diode is electrically connected to the driving unit. One end of the light receiving transistor is connected to a first power source, and the other end is connected to the output unit.

7. The DC water pump control circuit according to claim 2, characterized in that: The driving unit includes a switch tube, a third resistor and a fourth resistor. The first end of the switch tube is connected to the second power supply through the third resistor, the second end is electrically connected to the switch unit, and the control end of the switch tube is connected to the driving chip through the fourth resistor.

8. The DC water pump control circuit according to claim 7, characterized in that: The switch tube comprises an NPN transistor, a collector of the switch tube is connected to the second power supply through the third resistor, an emitter is electrically connected to the switch unit, and a base of the switch tube is connected to the driving chip through the fourth resistor.

9. The DC water pump control circuit according to claim 1, characterized in that: The identification module includes at least one of a jumper cap, a dial and a button, and when the identification module includes the jumper cap and the dial, the identification module is electrically connected to the DC water pump.

10. An air conditioner, characterized in that: The air conditioner comprises a DC water pump control circuit as claimed in any one of claims 1 to 9.

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