Water heater motor control assembly and water heater

Abstract

The invention provides a water heater motor control assembly and a water heater, the water heater motor control assembly comprises an inverter circuit, a drive circuit and a control circuit, and the inverter circuit is electrically connected with a motor; the driving circuit is electrically connected with the inverter circuit; the control circuit is electrically connected with the driving circuit; the control circuit is used for controlling the driving circuit to drive the inverter circuit to drive the motor to work; wherein at least two of the following items are integrated in the same integrated chip: at least one of the inverter circuits; a control circuit; and a driving circuit. Two of the inverter circuit, the control circuit and the driving circuit are integrated in the same integrated chip, so that the wiring distance between the inverter circuit, the control circuit and the driving circuit is shortened, and the situation that the motor is started too slowly due to signal interference caused by too long wiring when the control circuit controls the motor to start is avoided; and the control real-time performance and reliability of the control circuit on the water heater motor are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motor control circuits, and particularly to a water heater motor control component and a water heater. Background Art

[0002] At present, gas water heaters have been widely used in ordinary families, and gas water heaters meeting national standards are all equipped with one motor. In the past two years, DC motors have been widely used in gas water heaters due to their high cost performance. Currently, the motor control board on the market is integrated inside the motor of the water heater. During operation, the coil of the motor is prone to heat generation and temperature rise, which affects the service life of the motor control board. Generally, the motor control board uses a control circuit, a driver, and power devices to achieve control, or integrates the control circuit and the driver. With the discrete devices independent, such an arrangement results in long PCB traces when laying out the motor control board, causing interference when the motor starts, resulting in unsuccessful start-up of the water heater motor and entering a second start-up. Furthermore, the start-up of the water heater motor is slow, affecting the constant temperature time. The existing main control circuit uses a PWM control method for controlling the water heater motor, and the speed of the water heater motor is fed back by a square wave. When interference is caused by long PCB traces, the PWM feedback of the water heater motor is abnormal, resulting in abnormal speed of the water heater motor. Since it takes a certain amount of time for the main control circuit to process the conversion of the square wave into speed, the real-time performance and reliability of the control of the water heater motor are poor. Summary of the Invention

[0003] The main object of the present invention is to provide a water heater motor control component and a water heater, aiming to shorten the wiring distance between the water heater motor driver and the power transistor to improve the operating efficiency of the water heater motor.

[0004] The present invention provides a water heater motor control component, which includes: an inverter circuit electrically connected to the motor; a drive circuit electrically connected to a plurality of the inverter circuits; and a control circuit electrically connected to the drive circuit; the control circuit is configured to control the drive circuit to drive the inverter circuit to operate, so as to invert the input DC power supply and output it to the motor; at least two of the inverter circuit, the drive circuit, and the control circuit are integrated into one body.

[0005] Optionally, the inverter circuit includes a plurality of power devices.

[0006] Optionally, the water heater motor control component includes a motor control board; at least one of the following is provided on the motor control board: at least one of the plurality of power devices; the control circuit; the drive circuit.

[0007] Optionally, the control circuit, the drive circuit, and the plurality of power devices are all provided on the motor control board.

[0008] Optionally, the water heater motor control assembly further includes: a housing for wrapping the motor, and the motor control board is disposed outside the housing.

[0009] Optionally, the water heater motor control assembly further includes: a heat dissipation component; at least one of the following is disposed in close contact with the heat dissipation component: at least one of the plurality of power devices; the control circuit; the drive circuit.

[0010] Optionally, the control circuit, the drive circuit, and the plurality of power devices are all disposed on the motor control board; the heat dissipation component includes a heat dissipation pad disposed on the motor control board.

[0011] Optionally, the water heater motor control assembly includes: a rotation speed detection circuit, an input end of the rotation speed detection circuit is connected to an output end of the motor, and an output end of the rotation speed detection circuit is connected to an input end of the control circuit; the rotation speed detection circuit is configured to output a rotation speed detection signal of the motor through the control circuit.

[0012] Optionally, the water heater motor control assembly includes: a power detection circuit, an input end of the power detection circuit is connected to an output end of the motor, and an output end of the power detection circuit is connected to an input end of the control circuit; the power detection circuit is configured to output a power detection signal of the motor through the control circuit.

[0013] The present invention provides a water heater, which includes: a motor and the water heater motor control assembly as described above.

[0014] Optionally, the water heater further includes: a main control circuit; a communication circuit, the communication circuit is electrically connected to the main control circuit, and the communication circuit is configured to be electrically connected to the control circuit; the main control circuit is configured to output a control signal to the control circuit through the communication circuit, so that the control circuit controls the drive circuit to drive a plurality of power devices to drive the motor to rotate according to the control signal.

[0015] Optionally, the communication circuit includes a serial communication circuit.

[0016] Optionally, the water heater further includes: a connection component and a main control board, the main control circuit and the communication circuit are both disposed on the main control board; when the control circuit is disposed on the motor control board, the main control board and the motor control board are electrically connected through the connection component.

[0017] Optionally, the connection component includes a male pin header and a female pin header that cooperates with it; one of the male pin header and the female pin header is disposed on the main control board, and the other is disposed on the motor control board.

[0018] Optionally, the main control circuit further has a signal receiving end for accessing an external setting signal; the main control circuit is configured to output a corresponding control signal to the control circuit via the communication circuit according to the external setting signal, so that the motor operates at a rotational speed corresponding to the external setting signal or at a power corresponding to the external setting signal.

[0019] Optionally, the water heater further includes: a rotational speed detection circuit, an input end of the rotational speed detection circuit is connected to an output end of the motor, and an output end of the rotational speed detection circuit is connected to an input end of the control circuit; the rotational speed detection circuit is configured to output a rotational speed detection signal of the motor to the main control circuit via the control circuit and the communication circuit.

[0020] Optionally, the water heater further includes: a power detection circuit, an input end of the power detection circuit is connected to an output end of the motor, and an output end of the power detection circuit is connected to an input end of the control circuit; the power detection circuit is configured to output a power detection signal of the motor via the control circuit and the communication circuit.

[0021] Optionally, the main control circuit is configured to determine a target rotational speed according to the external setting signal, and determine a target power according to the target rotational speed; when the target power is greater than or equal to a preset power, the main control circuit outputs a corresponding control signal to the control circuit via the communication circuit, so that the motor operates at the target rotational speed; when the target power is less than the preset power, the main control circuit outputs a corresponding control signal to the control circuit via the communication circuit, so that the motor operates at the target power.

[0022] Optionally, the main control circuit is further configured to determine a rotational speed range in which the target rotational speed is located according to the target rotational speed, and select a target power matching the rotational speed range according to a mapping relationship between the rotational speed range and the target power.

[0023] Optionally, the water heater further includes: a sampling resistor, the number of the sampling resistors is one, the sampling resistor is disposed on the motor control board, an input end of the sampling resistor is connected to an output end of the inverter circuit, and an output end of the sampling resistor is connected to an input end of the control circuit; the sampling resistor is configured to detect an instantaneous current of a DC bus passing through the motor according to different switching states of a power bridge of the inverter circuit, and output a phase current of the motor to the control circuit in the form of a current detection signal.

[0024] The present invention provides a water heater motor control component and a water heater. The water heater motor control component includes: a plurality of power devices, a driving circuit, and a control circuit. Among them, the plurality of power devices are respectively electrically connected to the motor; the driving circuit is electrically connected to the plurality of power devices; the control circuit is electrically connected to the driving circuit; the control circuit is used to control the driving circuit to drive the plurality of power devices to drive the motor to work; wherein, at least two of the following are integrally provided in the same integrated chip: at least one of the plurality of power devices; the control circuit; the driving circuit. By integrally providing two of the power device, the control circuit, and the driving circuit in the same integrated chip, the present invention shortens the wiring distance between the two, avoids signal interference caused by too long wiring when the control circuit controls the motor to start, resulting in the situation that the motor starts too slowly, and improves the real-time performance and reliability of the control circuit for controlling the water heater motor. Brief Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0026] Figure 1 It is the circuit flowchart of a water heater motor control component and a water heater according to the present invention; Figure 2 It is the circuit flowchart of another embodiment of a water heater motor control component and a water heater according to the present invention; Figure 3 It is the circuit flowchart of another embodiment of a water heater motor control component and a water heater according to the present invention; Figure 4 It is the circuit flowchart of another embodiment of a water heater motor control component and a water heater according to the present invention.

[0027] The realization, functional characteristics, and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the drawings. Detailed Embodiments

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0030] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated into one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0032] The gas water heater includes a motor and a motor control board for controlling the operation of the motor. Currently, the motor control boards on the market usually use a control circuit, a driver, and a power device to achieve control, or adopt a method of integrating the control circuit with the drive, with the discrete devices being independent. Such an arrangement results in a long PCB trace when laying out the motor control board, causing interference when the motor starts, resulting in the failure of the water heater motor to start successfully and entering a second start. Furthermore, the start of the water heater motor is slow, affecting the constant temperature time. The existing main control uses a PWM control method for controlling the water heater motor, and the rotation speed of the water heater motor uses square wave feedback. When interference is caused by the long PCB trace, the PWM feedback of the water heater motor is abnormal, resulting in an abnormal rotation speed of the water heater motor. Since it takes a certain amount of time for the main control to process the conversion of the square wave into the rotation speed, the real-time performance and reliability of the control of the water heater motor are poor.

[0033] Therefore, in order to avoid the problem of poor real-time performance and low reliability in controlling the water heater motor due to the too long wiring distance between the control circuit, the driver, and the power transistor, the present invention proposes a water heater motor control component. Referring to Figure 1 , the water heater motor control component includes: An inverter circuit 80, electrically connected to the motor; A drive circuit 20, electrically connected to a plurality of the inverter circuits 80; and A control circuit 10, electrically connected to the drive circuit 20; the control circuit 10 is configured to control the drive circuit 20 to drive the inverter circuit 80 to operate, so as to invert an input DC power supply and output it to a motor; At least two of the inverter circuit 80, the drive circuit 20, and the control circuit 10 are integrated into one body.

[0034] It can be understood that, with reference to Figure 2 , the inverter circuit 80 includes a plurality of power devices. Since the existing gas water heater includes a motor and a motor control board for controlling the operation of the motor, the control circuit 10, the drive circuit 20, and a plurality of power devices 30 are arranged on the motor control board. When controlling the operation of the gas water heater, the control circuit 10 controls the drive circuit 20 to drive a plurality of power devices 30 to drive the motor to operate, so as to provide oxygen required for combustion and discharge the flue gas generated after combustion for the gas water heater. However, the control circuit 10, the drive circuit 20, and the plurality of power devices 30 on the existing motor control board are independently arranged, resulting in too long PCB traces between the control circuit 10, the drive circuit 20, and the plurality of power devices 30 when laying out the motor control board, so that the control circuit 10 is prone to introduce interference during the process of controlling the motor to start, resulting in unsuccessful motor start or slow motor start. In order to overcome the above deficiencies, the present invention proposes a water heater motor control component. By integrating two of the control circuit 10, the drive circuit 20, and the power device 30 into the same integrated chip, the wiring distance between the control circuit 10, the drive circuit 20, and the power device 30 can be shortened, thereby avoiding signal interference due to too long wiring when the control circuit 10 controls the motor to start, resulting in slow motor start, and improving the control real-time performance and reliability of the control circuit 10 for the water heater motor.

[0035] It should be understood that the water heater motor control component includes a plurality of power devices 30, a drive circuit 20, and a control circuit 10. Among them, at least two of the power device 30, the drive circuit 20, and the control circuit 10 are integrated in the same integrated chip. For example, the power device 30 can be integrated with the drive circuit 20 in the same integrated chip; the power device 30 can be integrated with the control circuit 10 in the same integrated chip; the drive circuit 20 can be integrated with the control circuit 10 in the same integrated chip; the power device 30, the drive circuit 20, and the control circuit 10 can be simultaneously integrated in the same integrated chip. It should be noted that the number of power devices 30 is multiple. When the power device 30 is integrated with the control circuit 10 or the drive circuit 20 in the same integrated chip, at least one power device 30 can be mutually integrated with the control circuit 10, or at least one power device 30 can be mutually integrated with the drive circuit 20. For example, one power device 30 can be integrated with the control circuit 10 in the same integrated chip; three power devices 30 can be integrated with the control circuit 10 in the same integrated chip; one power device 30 can be integrated with the drive circuit 20 in the same integrated chip; three power devices 30 can be integrated with the drive circuit 20 in the same integrated chip. Similarly, when the power device 30 is simultaneously integrated with the control circuit 10 and the drive circuit 20 in the same integrated chip, at least one power device 30 can be simultaneously mutually integrated with the control circuit 10 and the drive circuit 20. For example, one power device 30 can be simultaneously integrated with the control circuit 10 and the drive circuit 20 in the same integrated chip; three power devices 30 can be simultaneously integrated with the control circuit 10 and the drive circuit 20 in the same integrated chip.

[0036] This embodiment is described by taking the simultaneous integration of one power device 30, the control circuit 10, and the drive circuit 20 in the same integrated chip as an example. When one power device 30, the control circuit 10, and the drive circuit 20 are simultaneously integrated in the same integrated chip, when controlling the operation of the water heater, the control circuit 10 on the motor control board controls the drive circuit 20 to drive one power device 30 to drive the motor to operate, so as to provide the oxygen required for combustion of the water heater and discharge the flue gas generated after combustion. Thus, the wiring distance between one power device 30, the control circuit 10, and the drive circuit 20 is shortened, and the real-time performance and reliability of the control circuit 10 for controlling the water heater motor are improved.

[0037] The present invention provides a water heater motor control assembly, which includes an inverter circuit 80, a drive circuit 20, and a control circuit 10. Among them, the inverter circuit 80 is electrically connected to the motor respectively; the drive circuit 20 is electrically connected to the inverter circuit 80; the control circuit 10 is electrically connected to the drive circuit 20; the control circuit 10 is used to control the drive circuit 20 to drive the inverter circuit 80 to drive the motor to work. Among them, at least two of the following are integrally provided in the same integrated chip: at least one of the inverter circuit 80; the control circuit 10; the drive circuit 20. By integrally providing two of the inverter circuit 80, the control circuit 10, and the drive circuit 20 in the same integrated chip, the present invention shortens the wiring distance between the two, avoids signal interference caused by too long wiring when the control circuit 10 controls the motor to start, resulting in the situation that the motor starts too slowly, and improves the real-time performance and reliability of the control circuit 10 for controlling the water heater motor.

[0038] In one embodiment, referring to Figure 2 , the inverter circuit 80 includes a plurality of power devices.

[0039] It can be understood that in this embodiment, the inverter circuit 80 includes a plurality of power devices. Among them, at least two of the power device 30, the drive circuit 20, and the control circuit 10 are integrally provided in the same integrated chip. For example, the power device 30 can be integrated with the drive circuit 20 in the same integrated chip; the power device 30 can be integrated with the control circuit 10 in the same integrated chip; the drive circuit 20 can be integrated with the control circuit 10 in the same integrated chip; the power device 30, the drive circuit 20, and the control circuit 10 can be simultaneously integrated in the same integrated chip. It should be noted that the number of the power devices 30 is multiple. When the power device 30 is integrated with the control circuit 10 or the drive circuit 20 in the same integrated chip, at least one power device 30 can be integrally provided with the control circuit 10, or at least one power device 30 can be integrally provided with the drive circuit 20. For example, one power device 30 can be integrated with the control circuit 10 in the same integrated chip; three power devices 30 can be integrated with the control circuit 10 in the same integrated chip; one power device 30 can be integrated with the drive circuit 20 in the same integrated chip; three power devices 30 can be integrated with the drive circuit 20 in the same integrated chip. Similarly, when the power device 30 is simultaneously integrated with the control circuit 10 and the drive circuit 20 in the same integrated chip, at least one power device 30 can be simultaneously integrally provided with the control circuit 10 and the drive circuit 20. For example, one power device 30 can be simultaneously integrated with the control circuit 10 and the drive circuit 20 in the same integrated chip; three power devices 30 can be simultaneously integrated with the control circuit 10 and the drive circuit 20 in the same integrated chip.

[0040] In one embodiment, the water heater motor control assembly includes: a motor control board; at least two of the following are provided on the motor control board: At least one of the plurality of power devices 30; The control circuit 10; The drive circuit 20.

[0041] It can be understood that at least two of the power device 30, the drive circuit 20, and the control circuit 10 are provided on the motor control board. For example, the power device 30 and the drive circuit 20 can be provided on the motor control board; the power device 30 and the control circuit 10 can be provided on the motor control board; the drive circuit 20 and the control circuit 10 can be provided on the motor control board; the power device 30, the drive circuit 20, and the control circuit 10 can be provided on the motor control board simultaneously.

[0042] It should be noted that in this embodiment, the number of power devices 30 is multiple. When the power device 30 is provided on the motor control board together with the control circuit 10 or the drive circuit 20, at least one power device 30 can be provided on the motor control board together with the control circuit 10, or at least one power device 30 can be provided on the motor control board together with the drive circuit 20. For example, one power device 30 can be provided on the motor control board together with the control circuit 10; three power devices 30 can be provided on the motor control board together with the control circuit 10; one power device 30 can be provided on the motor control board together with the drive circuit 20; three power devices 30 can be provided on the motor control board together with the drive circuit 20. Similarly, when the power device 30 is provided on the motor control board together with the control circuit 10 and the drive circuit 20 simultaneously, at least one power device 30 can be provided on the motor control board together with the control circuit 10 and the drive circuit 20 simultaneously. For example, one power device 30 can be provided on the motor control board together with the control circuit 10 and the drive circuit 20 simultaneously; three power devices 30 can be provided on the motor control board together with the control circuit 10 and the drive circuit 20 simultaneously.

[0043] In one embodiment, the control circuit 10, the drive circuit 20, and the plurality of power devices 30 are all provided on the motor control board.

[0044] It can be understood that in this embodiment, the control circuit 10, the drive circuit 20, and the plurality of power devices 30 are all provided on the motor control board. Taking the example that the plurality of power devices 30 includes three power devices 30, the three power devices 30 are provided on the motor control board together with the control circuit 10 and the drive circuit 20 simultaneously. When controlling the water heater to work, the control circuit 10 on the motor control board controls the drive circuit 20 to drive the three power devices 30 to drive the motor to work, so as to provide the oxygen required for combustion of the water heater and discharge the flue gas generated after combustion.

[0045] In one embodiment, the water heater motor control assembly further includes: A housing for enclosing the motor, and the motor control board is disposed outside the housing.

[0046] It can be understood that in the prior art, the motor control board is integrated with the motor. When the water heater is operating, the motor is prone to coil heating and temperature rise, which affects the service life of the motor control board in a high-temperature environment. Therefore, in order to prevent the normal operation of the motor control board from being affected when the water heater is operating, in this embodiment, the motor control board is externally disposed outside the housing so that the motor control board is set away from the motor, thereby avoiding the influence of the motor temperature on the motor control board.

[0047] In one embodiment, the water heater motor control assembly further includes: a heat dissipation member; At least one of the following is disposed in contact with the heat dissipation member: At least one of the plurality of power devices 30; The control circuit 10; The drive circuit 20.

[0048] It can be understood that when the water heater is operating, the devices on the motor control board will generate a certain amount of heat due to continuous operation, resulting in an increase in the temperature of the motor control board. To affect the service life of the motor control board in a high-temperature environment, a heat dissipation member is provided in this embodiment to reduce the temperature of the motor control board.

[0049] Optionally, the heat dissipation member can be one or more. When the heat dissipation member is one, a heat dissipation pad can be used. For example, a heat dissipation pad is used as the heat dissipation member and disposed on the motor control board to achieve the effect of cooling the motor control board. When the heat dissipation member is multiple, each heat dissipation member is in contact with the plurality of power devices 30, the control circuit 10, and the drive circuit 20 respectively to achieve the effect of simultaneously reducing the temperatures of the plurality of power devices 30, the control circuit 10, and the drive circuit 20.

[0050] In one embodiment, the control circuit 10, the drive circuit 20, and the plurality of power devices 30 are all disposed on the motor control board; The heat dissipation member includes a heat dissipation pad disposed on the motor control board.

[0051] It can be understood that in this embodiment, the control circuit 10, the drive circuit 20, and the multiple power devices 30 are all arranged on the motor control board. To avoid a large amount of heat being generated by the control circuit 10, the drive circuit 20, and the multiple power devices 30 on the motor control board during operation, this embodiment is also provided with a heat dissipation component, and the number of heat dissipation components is one, and the heat dissipation component is implemented by a heat dissipation pad. In practical applications, setting the heat dissipation pad as the heat dissipation component on the motor control board can achieve the effect of cooling the motor control board, thereby reducing the temperatures of the multiple power devices 30, the control circuit 10, and the drive circuit 20 on the motor control board.

[0052] In one embodiment, referring to Figure 3 , the water heater motor control assembly includes: A rotation speed detection circuit 40, the input end of the rotation speed detection circuit 40 is connected to the output end of the motor, and the output end of the rotation speed detection circuit 40 is connected to the input end of the control circuit 10; The rotation speed detection circuit 40 is configured to output a rotation speed detection signal of the motor through the control circuit 10.

[0053] It can be understood that in this embodiment, the water heater motor control assembly further includes a rotation speed detection circuit 40 for detecting the rotation speed of the motor. In practical applications, the rotation speed detection circuit 40 detects the rotation speed of the motor and feeds back a rotation speed detection signal to the main control circuit 70 for controlling the entire water heater, and the main control circuit 70 obtains the rotation speed of the motor in real time according to the rotation speed detection signal.

[0054] In one embodiment, referring to Figure 3 , the water heater motor control assembly includes: A power detection circuit 50, the input end of the power detection circuit 50 is connected to the output end of the motor, and the output end of the power detection circuit 50 is connected to the input end of the control circuit 10; The power detection circuit 50 is configured to output a power detection signal of the motor through the control circuit 10.

[0055] It can be understood that in this embodiment, the water heater motor control assembly further includes a power detection circuit 50 for detecting the power of the motor. In practical applications, the power detection circuit 50 detects the power of the motor and feeds back a power detection signal to the main control circuit 70 for controlling the entire water heater, and the main control circuit 70 obtains the power of the motor in real time according to the power detection signal.

[0056] The present invention also proposes a water heater, which includes: a motor and the water heater motor control assembly as described above.

[0057] It can be understood that the present invention also provides a water heater, which includes a motor and a water heater motor control component. Among them, the water heater motor control component includes a plurality of power devices 30, a driving circuit 20, and a control circuit 10. The control circuit 10 controls the driving circuit 20 to drive the plurality of power devices 30 to drive the motor to work, so as to provide the oxygen required for combustion for the gas water heater and discharge the flue gas generated after combustion. The present invention integrates two of the plurality of power devices 30, the driving circuit 20, and the control circuit 10 into the same integrated chip, shortening the wiring distance between the control circuit 10, the driving circuit 20, and the power device 30. Thereby, it is avoided that the control circuit 10 has signal interference due to too long wiring when controlling the motor to start, resulting in the situation that the motor starts too slowly, and the real-time performance and reliability of the control circuit 10 for controlling the water heater motor are improved.

[0058] In one embodiment, referring to Figure 4 , the water heater further includes: A main control circuit 70; A communication circuit 60, the communication circuit 60 is electrically connected to the main control circuit 70, and the communication circuit 60 is used to be electrically connected to the control circuit 10; The main control circuit 70 is configured to output the control signal to the control circuit 10 through the communication circuit 60, so that the control circuit 10 controls the driving circuit 20 to drive the plurality of power devices 30 to drive the motor to rotate according to the control signal.

[0059] It can be understood that in this embodiment, the water heater further includes a main control circuit 70 for controlling the whole water heater and a communication circuit 60 for communicating with the main control circuit 70. In practical applications, communication between the main control circuit 70 and the control circuit 10 is realized through the communication circuit 60. In addition, the surface of the water heater also has trigger buttons of different gears. When the user triggers the trigger button of the water heater, the trigger button outputs an external setting signal corresponding to the gear to the main control circuit 70. The main control circuit 70 judges the starting power required by the motor according to the external setting signal, and outputs a corresponding control signal to the control circuit 10 through the communication circuit 60, so that the control circuit 10 controls the motor to rotate in different working modes according to the control signal. For example, the control circuit 10 controls the driving circuit 20 to drive the plurality of power devices 30 to drive the motor to rotate in a constant power mode according to the control signal, or the control circuit 10 controls the driving circuit 20 to drive the plurality of power devices 30 to drive the motor to rotate in a constant speed mode according to the control signal.

[0060] In one embodiment, referring to Figure 4 , the communication circuit 60 includes a serial communication circuit 60.

[0061] It can be understood that in this embodiment, the communication circuit 60 includes a serial communication circuit 60, and the main control circuit 70 and the control circuit 10 are connected for communication in a serial communication manner. Specifically, the control signal output by the main control circuit 70 is sent to the serial communication circuit 60, and the serial communication circuit 60 converts the control signal into a serial signal and outputs it to the control circuit 10. The control circuit 10 controls the rotation of the motor according to the serial signal output by the serial communication circuit 60.

[0062] In one embodiment, the water heater further includes: A connection component; A main control board, on which both the main control circuit 70 and the communication circuit 60 are provided; When the control circuit 10 is provided on the motor control board, the main control board and the motor control board are electrically connected through the connection component.

[0063] It can be understood that in this embodiment, both the main control circuit 70 and the communication circuit 60 are provided on the main control board. When the control circuit 10 is provided on the motor control board, the main control board establishes an electrical connection relationship with the motor control board through the connection component. Among them, the connection component can be a terminal block, a PCB connector, an industrial connector, a junction box, a heavy-duty connector, a cable, a cable joint, a safety barrier, a contact, a pin header connector, etc. In practical applications, the main control circuit 70 outputs a control signal, and the control signal passes through the communication circuit 60 and the connection component in sequence and finally reaches the control circuit 10, so that the control circuit 10 controls the rotation of the motor.

[0064] In one embodiment, the connection component includes a male pin header and a female pin header arranged in cooperation therewith; One of the male pin header and the female pin header is provided on the main control board, and the other is provided on the motor control board.

[0065] It can be understood that the connection component includes a pin header connector, and the pin header connector includes a male pin header and a female pin header arranged in cooperation therewith. In the first implementation, the male pin header is provided on the main control board, and the female pin header is provided on the motor control board. The male pin header and the female pin header are connected to establish an electrical connection relationship between the main control board and the motor control board; in the second embodiment, the male pin header is provided on the motor control board, and the female pin header is provided on the main control board. The male pin header and the female pin header are connected to establish an electrical connection relationship between the main control board and the motor control board.

[0066] In one embodiment, the main control circuit 70 further has a signal receiving end for accessing an externally set signal; The main control circuit 70 is configured to output a corresponding control signal to the control circuit 10 via the communication circuit 60 according to the external setting signal, so that the motor operates at a rotational speed corresponding to the external setting signal or at a power corresponding to the external setting signal.

[0067] It can be understood that in this embodiment, the surface of the water heater has trigger buttons with different gears. When the user triggers the trigger button of the water heater, the trigger button outputs an external setting signal corresponding to the gear to the main control circuit 70. The main control circuit 70 determines the starting power required by the motor according to the external setting signal, and outputs a corresponding control signal to the control circuit 10 via the communication circuit 60, so that the control circuit 10 controls the rotation of the motor in different working modes according to the control signal. For example, the control circuit 10 controls the drive circuit 20 to drive a plurality of power devices 30 to drive the motor to rotate in a constant power mode according to the control signal, or the control circuit 10 controls the drive circuit 20 to drive a plurality of power devices 30 to drive the motor to rotate in a constant speed mode according to the control signal.

[0068] In one embodiment, referring to Figure 4 , the water heater further includes: A rotational speed detection circuit 40, the input end of the rotational speed detection circuit 40 is connected to the output end of the motor, and the output end of the rotational speed detection circuit 40 is connected to the input end of the control circuit 10; The rotational speed detection circuit 40 is configured to output a rotational speed detection signal of the motor to the main control circuit 70 via the control circuit 10 and the communication circuit 60.

[0069] It can be understood that motor feedback refers to the signal generated during the operation of the motor being fed back to the main control circuit 70 for real-time monitoring and adjustment of the operation state and performance of the motor. In this embodiment, the motor feedback includes motor rotational speed feedback. The rotational speed of the motor is detected in real time by the rotational speed detection circuit 40, and a rotational speed detection signal of the motor is output to the main control circuit 70 via the control circuit 10 and the communication circuit 60. The main control circuit 70 detects the actual speed of the motor shaft according to the rotational speed detection signal to obtain the speed of the motor operation, thereby realizing the control and adjustment of the motor rotational speed.

[0070] In one embodiment, referring to Figure 4 , the water heater further includes: A power detection circuit 50, the input end of the power detection circuit 50 is connected to the output end of the motor, and the output end of the power detection circuit 50 is connected to the input end of the control circuit 10; The power detection circuit 50 is configured to output a power detection signal of the motor via the control circuit 10 and the communication circuit 60.

[0071] It can be understood that motor feedback refers to the signal generated during the operation of the motor being fed back to the main control circuit 70 for real-time monitoring and adjustment of the operating state and performance of the motor. In this embodiment, the motor feedback includes motor power feedback. The power of the motor is detected in real time by the power detection circuit 50, and the power detection signal of the motor is output to the main control circuit 70 through the control circuit 10 and the communication circuit 60. The main control circuit 70 detects the actual power of the motor shaft according to the power detection signal to obtain the power of the motor operation, thereby realizing the control and adjustment of the motor power.

[0072] In one embodiment, referring to Figure 4 the main control circuit 70 is configured to determine a target speed according to the external setting signal, and determine a target power according to the target speed; When the target power is greater than or equal to the preset power, the main control circuit 70 outputs a corresponding control signal to the control circuit 10 through the communication circuit 60, so that the motor operates at the target speed; When the target power is less than the preset power, the main control circuit 70 outputs a corresponding control signal to the control circuit 10 through the communication circuit 60, so that the motor operates at the target power.

[0073] It can be understood that when the motor operates in a low-power state, the drive current of the motor is too low, and the wind resistance ability of the motor is poor, resulting in low stability and safety performance of the motor. In addition, the motor feedback current obtained by the main control circuit 70 is unstable, reducing the control reliability of the main control circuit 70 for the motor. To avoid the phenomenon of unstable operation when the motor operates in a low-power state, the working mode of the motor in this embodiment is set to a constant power mode and a constant speed mode, so that the motor operates in the constant power mode when in a low-power state, and the motor operates in the constant speed mode when in a high-power state. In practical applications, the surface of the water heater also has trigger buttons with different gears. When the user triggers the trigger button of the water heater, the trigger button outputs an external setting signal corresponding to the gear to the main control circuit 70. The main control circuit 70 determines the target speed according to the external setting signal and determines the target power according to the target speed. When the main control circuit 70 detects that the target power is greater than or equal to 12W, it outputs a first control signal to the control circuit 10 through the communication circuit 60, so that the control circuit 10 controls the motor to work in the constant speed mode; when the main control circuit 70 detects that the target power is less than 12W, it outputs a second control signal to the control circuit 10 through the communication circuit 60, so that the control circuit 10 controls the motor to work in the constant power mode.

[0074] In one embodiment, the main control circuit 70 is further configured to determine the speed range in which the target speed is located according to the target speed, and select a target power matching the speed range according to the mapping relationship between the speed range and the target power.

[0075] It can be understood that in this embodiment, the mapping relationship between the rotational speed range and the target power obtained from the experimental data of the technician is as follows: when the target rotational speed of the motor is lower than 2000 revolutions per minute (r / min), the target power of the motor is correspondingly lower than 12 W; when the target rotational speed of the motor is not lower than 2000 r / min, the target power of the motor is correspondingly not lower than 12 W. In practical applications, when the main control circuit 70 confirms that the target rotational speed is in the rotational speed range lower than 2000 r / min, according to the mapping relationship between the rotational speed range and the target power, it selects the current target power of the motor to be lower than 12 W, that is, controls the motor to operate in a constant power mode; when the main control circuit 70 confirms that the target rotational speed is in the rotational speed range not lower than 2000 r / min, according to the mapping relationship between the rotational speed range and the target power, it determines the current target power of the motor to be a target power not lower than 12 W, that is, controls the motor to operate in a constant rotational speed mode.

[0076] In one embodiment, the water heater further includes: A sampling resistor, the number of the sampling resistors is one, the sampling resistor is arranged on the motor control board, and the input end of the sampling resistor is connected to the output end of the inverter circuit, and the output end of the sampling resistor is connected to the input end of the control circuit; The sampling resistor is used to detect the instantaneous current of the DC bus passing through the motor according to different switching states of the power bridge of the inverter circuit, and output the phase current of the motor to the main control circuit through the control circuit and the communication circuit.

[0077] It can be understood that in the motor control component of the water heater, the main control circuit needs to measure the current in the motor winding in a timely and accurate manner to implement the design of the current closed-loop control and the current protection circuit. For this purpose, it is necessary to detect the current of the motor. The current detection can be realized by using one sampling resistor or multiple sampling resistors. This embodiment takes the realization of the current detection of the motor by using one sampling resistor as an example to expand the description. Specifically, since the inverter circuit is composed of a power bridge, when a sampling resistor is connected to the inverter circuit, it can detect the instantaneous current of the DC bus passing through the motor according to different switching states of the power bridge of the inverter circuit, and obtain the phase current of the motor based on the instantaneous current of the DC bus passing through the motor, and output the phase current of the motor to the main control circuit through the control circuit and the communication circuit, so that the main control circuit can implement the current closed-loop control according to the phase current of the motor. It should be understood that this embodiment uses one sampling resistor to realize the current detection function of the motor, and one sampling resistor is arranged on the motor control board, making the space of the motor control board smaller. In addition, compared with multiple sampling resistors, using one sampling resistor can enable the main control circuit to operate the motor algorithm more efficiently.

[0078] The above are only alternative embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A water heater motor control component, characterized in that, The water heater motor control assembly includes: An inverter circuit electrically connected to the motor; A drive circuit electrically connected to a plurality of the inverter circuits; and A control circuit electrically connected to the drive circuit; the control circuit is configured to control the drive circuit to drive the inverter circuit to operate, so as to invert an input DC power supply and output it to the motor; At least two of the inverter circuit, the drive circuit, and the control circuit are integrated into one body.

2. The water heater motor control assembly according to claim 1, wherein The inverter circuit includes a plurality of power devices.

3. The water heater motor control assembly according to claim 2, wherein The water heater motor control assembly includes a motor control board; At least two of the following are arranged on the motor control board: At least one of the plurality of power devices; The control circuit; The drive circuit.

4. The water heater motor control assembly according to claim 3, characterized in that, The control circuit, the drive circuit, and the plurality of power devices are all arranged on the motor control board.

5. The water heater motor control assembly according to claim 3, wherein, The water heater motor control assembly further includes: A housing for wrapping the motor, and the motor control board is arranged on the outside of the housing.

6. The water heater motor control assembly according to claim 3, wherein The water heater motor control assembly further includes: a heat dissipation component; At least one of the following is arranged in close contact with the heat dissipation component: At least one of the plurality of power devices; The control circuit; The drive circuit.

7. The water heater motor control assembly according to claim 6, wherein, The control circuit, the drive circuit, and the plurality of power devices are all arranged on the motor control board; The heat dissipation component includes a heat dissipation pad arranged on the motor control board.

8. The water heater motor control assembly according to claim 1, characterized in that The water heater motor control assembly includes: A speed detection circuit, the input end of the speed detection circuit is connected to the output end of the motor, and the output end of the speed detection circuit is connected to the input end of the control circuit; The speed detection circuit is configured to output a speed detection signal of the motor through the control circuit.

9. The water heater motor control assembly according to claim 1, wherein, The water heater motor control assembly includes: A power detection circuit, the input end of the power detection circuit is connected to the output end of the motor, and the output end of the power detection circuit is connected to the input end of the control circuit; The power detection circuit is configured to output a power detection signal of the motor through the control circuit.

10. A water heater, characterized in that, The water heater includes: a motor and the water heater motor control assembly according to any one of claims 1-7.

11. The water heater according to claim 10, characterized in that, The water heater further includes: A main control circuit; A communication circuit, the communication circuit is electrically connected to the main control circuit, and the communication circuit is configured to be electrically connected to the control circuit; The main control circuit is configured to output a control signal to the control circuit through the communication circuit, so that the control circuit controls the drive circuit to drive a plurality of power devices to drive the motor to rotate according to the control signal.

12. The water heater according to claim 11, characterized in that, The communication circuit includes a serial communication circuit.

13. The water heater according to claim 11, characterized in that, The water heater further includes: A connection component; A main control board, and the main control circuit and the communication circuit are both arranged on the main control board; When the control circuit is arranged on the motor control board, the main control board and the motor control board are electrically connected through the connection component.

14. The water heater according to claim 13, characterized in that, The connection component includes a male pin header and a female pin socket that cooperates with it; One of the male pin header and the female pin socket is arranged on the main control board, and the other is arranged on the motor control board.

15. The water heater according to any one of claims 11-14, characterized in that, The main control circuit further has a signal receiving end for accessing an externally set signal; The main control circuit is configured to output a corresponding control signal to the control circuit via the communication circuit according to the external setting signal, so that the motor operates at a rotational speed corresponding to the external setting signal or operates at a power corresponding to the external setting signal.

16. The water heater according to claim 15, characterized in that, The water heater further includes: a rotational speed detection circuit, wherein an input end of the rotational speed detection circuit is connected to an output end of the motor, and an output end of the rotational speed detection circuit is connected to an input end of the control circuit; The rotational speed detection circuit is configured to output a rotational speed detection signal of the motor to the main control circuit via the control circuit and the communication circuit.

17. The water heater according to claim 15, characterized in that, The water heater further includes: a power detection circuit, wherein an input end of the power detection circuit is connected to an output end of the motor, and an output end of the power detection circuit is connected to an input end of the control circuit; The power detection circuit is configured to output a power detection signal of the motor via the control circuit and the communication circuit.

18. The water heater according to claim 15, characterized in that, The main control circuit is configured to determine a target rotational speed according to the external setting signal, and determine a target power according to the target rotational speed; When the target power is greater than or equal to a preset power, the main control circuit outputs a corresponding control signal to the control circuit via the communication circuit, so that the motor operates at the target rotational speed; When the target power is less than the preset power, the main control circuit outputs a corresponding control signal to the control circuit via the communication circuit, so that the motor operates at the target power.

19. The water heater according to claim 18, wherein The main control circuit is further configured to determine a rotational speed range in which the target rotational speed is located according to the target rotational speed, and select a target power matching the rotational speed range according to a mapping relationship between the rotational speed range and the target power.

20. The water heater according to claim 11, wherein, The water heater further includes: a sampling resistor, the number of the sampling resistors is one, the sampling resistor is arranged on the motor control board, an input end of the sampling resistor is connected to an output end of the inverter circuit, and an output end of the sampling resistor is connected to an input end of the control circuit; The sampling resistor is configured to detect an instantaneous current of a DC bus passing through the motor according to different switching states of a power bridge of the inverter circuit, and output a phase current of the motor to the control circuit in the form of a current detection signal.

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