Warm air blower control device and warm air blower

Abstract

The utility model discloses a warm air blower control device and a warm air blower. The warm air blower control device comprises a microcontroller, a power module, a control detection module and an adjusting module. The input end of the power supply module is connected with a power supply, and the output end is connected with the microcontroller; the control detection module comprises a control unit and a load detection unit, the input end of the control unit is connected with the output end of the microcontroller, the output end is connected with the motor, and the control unit is used for starting the motor; the input end of the load detection unit is connected with the motor through the control unit, the output end of the load detection unit is connected with the microcontroller, and the load detection unit is used for collecting phase current of the motor in the operation process, converting the phase current into voltage and sending the voltage to the microcontroller; and the adjusting module is used for receiving a modulation signal converted by the microcontroller according to the voltage and adjusting the rotating speed of the motor. According to the utility model, the input voltage of the motor is adjusted by using the PWM technology, and finally the rotating speed of the motor is adjusted, thereby improving the speed change performance and the control performance.

Description

Technical Field

[0001] The utility model relates to the technical field of air heaters, in particular to a control device for an air heater and an air heater. Background Art

[0002] A fan heater uses a fan to move air, passing through a heating element inside the unit before being released outside to raise the indoor air temperature and provide warmth. To achieve a desired heating effect, the fan must have a certain speed and volume—in other words, a certain power.

[0003] Currently, even the smallest mini-size fan heaters have fan power exceeding 10 watts, with an axial dimension exceeding 50 mm, resulting in a large diameter. Existing home heater fans are all powered by AC power (outdoor use is not included in the "home heaters" referred to here), and all use internal rotor motors. The blades move relative to the motor's stator and are separated from each other, resulting in larger fans.

[0004] At present, heaters driven by AC motors can generally only achieve three-level speed regulation, and are not easy to achieve stepless speed regulation. Their control performance is poor. In addition, when heaters driven by AC motors are started, the starting current is large, which will have a certain impact on the power grid during startup. In addition, heaters driven by AC motors may vibrate and make noise during operation, further indicating their poor control performance.

[0005] In the process of implementing the present invention, the inventors discovered that the prior art has at least the following problems:

[0006] The control performance of the heater currently driven by an AC motor is poor. Utility Model Content

[0007] The present invention aims to provide a heater control device and heater to address the technical problem of poor control performance of heaters driven by AC motors in the prior art. The various technical effects of the preferred technical solution among the various technical solutions provided by the present invention are described in detail below.

[0008] To achieve the above objectives, the present invention provides the following technical solutions:

[0009] In a first aspect, the utility model provides a heater control device, comprising a microcontroller, a power module, a control detection module and an adjustment module;

[0010] The input end of the power module is connected to the power supply, and the output end is connected to the microcontroller, and the power module is used to output direct current;

[0011] The control detection module includes a control unit and a load detection unit. The input end of the control unit is connected to the output end of the microcontroller, and the output end is connected to the motor. The control unit is used to start the motor; the input end of the load detection unit is connected to the motor through the control unit, and the output end is connected to the microcontroller. The load detection unit is used to collect the phase current of the motor during operation, and convert the phase current into voltage and send it to the microcontroller.

[0012] One end of the regulating module is connected to the microcontroller, and the other end is connected to the motor. The regulating module is used to receive the modulation signal converted by the microcontroller according to the voltage and adjust the speed of the motor;

[0013] The motor is a brushless DC motor.

[0014] Optionally, the adjustment module includes a connector;

[0015] The connector includes four pins; the first pin of the connector is connected to the power supply; the second pin of the connector is grounded; the third pin of the connector is connected to the PC5 / PWM pin of the microcontroller, for receiving the modulation signal sent by the microcontroller and adjusting the speed of the motor; the fourth pin of the connector is connected to the PA0 pin of the microcontroller, for sending the FG signal of the motor to the microcontroller.

[0016] Optionally, the model of the connector is XH2.54-4P.

[0017] Optionally, the power module includes a power detection unit, the input end of the power detection unit is connected to the power supply, and the output end is connected to the microcontroller; the power detection unit is used to detect the supply voltage of the power supply and then supply it to the microcontroller.

[0018] Optionally, the power supply module also includes a voltage stabilizing unit, the input end of the voltage stabilizing unit is connected to the power supply, and the output end is connected to the microcontroller; the voltage stabilizing unit includes a voltage stabilizing chip and a voltage stabilizing diode, and the voltage stabilizing unit is used to convert high voltage input into low voltage output, and stabilize the voltage provided by the power supply and supply it to the microcontroller.

[0019] Optionally, the model of the voltage regulator chip is CXM7533, and the model of the voltage regulator diode is SMBJ28CA.

[0020] Optionally, the control unit includes a U-phase control unit, a V-phase control unit and a W-phase control unit;

[0021] The U-phase control unit, the V-phase control unit and the W-phase control unit respectively comprise a first control chip, a second control chip and a third control chip;

[0022] The G1 pin of the first control chip is connected with the UL pin of the microcontroller, and the G2 pin is connected with the UH pin of the microcontroller; the G1 pin of the second control chip is connected with the VL pin of the microcontroller, and the G2 pin is connected with the VH pin of the microcontroller; and the G1 pin of the third control chip is connected with the WL pin of the microcontroller, and the G2 pin is connected with the WH pin of the microcontroller;

[0023] The U-phase control unit, the V-phase control unit and the W-phase control unit respectively control the U-phase, the V-phase and the W-phase of the motor through the first control chip, the second control chip and the third control chip, so as to control the start and stop of the motor.

[0024] Optionally, the load detection unit comprises a U-phase load detection unit, a V-phase load detection unit and a W-phase load detection unit.

[0025] The U-phase load detection unit is connected with the S1 pin of the first control chip and the AIO3 pin and the AIO2 pin of the microcontroller respectively.

[0026] The V-phase load detection unit is connected with the S1 pin of the second control chip and the AIO9 pin of the microcontroller respectively.

[0027] The W-phase load detection unit is connected with the S1 pin of the third control chip and the AIO1 pin and the AIO0 pin of the microcontroller respectively.

[0028] The U-phase load detection unit, the V-phase load detection unit and the W-phase load detection unit respectively collect the phase current of the motor through the first control chip, the second control chip and the third control chip.

[0029] Optionally, the model of the microcontroller is FG8692S / TSSOP28.

[0030] In the second aspect, the utility model also discloses a fan heater, which comprises the fan heater control device according to any one of the above.

[0031] The above technical scheme of the utility model has the following advantages or beneficial effects:

[0032] The control device in this embodiment includes a microcontroller, a power module, a control detection module, and a regulation module. The power module, control detection module, and regulation module are all connected to the microcontroller. The control detection module can control the motor startup and obtain the motor's phase current, converting the phase current. Finally, the microcontroller outputs a modulation signal to the regulation module, which adjusts the motor's speed. This utility model uses PWM technology to adjust the motor's input voltage and ultimately adjust the motor's speed, improving its speed-changing performance and control performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0034] Figure 1 This is a structural diagram of a heater control device according to an embodiment of the present utility model;

[0035] Figure 2 This is a circuit diagram of a microcontroller in a heater control device according to an embodiment of the present utility model;

[0036] Figure 3 This is a circuit diagram of a control and detection module in a heater control device according to an embodiment of the present utility model;

[0037] Figure 4 This is a circuit diagram of a power module in a heater control device according to an embodiment of the present utility model;

[0038] Figure 5 This is a circuit diagram of a regulating module in a heater control device according to an embodiment of the present utility model.

[0039] In the figure: 1. power supply module; 2. microcontroller; 3. control detection module; 31. control unit; 32. load detection unit; 4. regulation module. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the utility model clearer and more apparent, the various exemplary embodiments to be described below will be referred to the corresponding drawings, which constitute a part of the exemplary embodiments, wherein the various exemplary embodiments possibly adopted to realize the utility model are described. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present disclosure. It should be understood that they are only examples of processes, methods and devices, etc. consistent with some aspects of the utility model disclosed in the appended claims, other embodiments can also be used, or structural and functional modifications can be made to the embodiments listed herein, without departing from the scope and essence of the utility model.

[0041] In the description of the utility model, it is understood that the terms "center", "longitudinal", "transverse" and the like indicate the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the elements referred to must have a specific orientation, structure and operation. The terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "a plurality of" means two or more. The terms "connected", "connected" should be broadly understood, for example, it can be fixed connection, detachable connection, integral connection, mechanical connection, electrical connection, communication connection, direct connection, indirect connection through intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. The term "and / or" includes any and all combinations of one or more related listed items. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0042] In order to illustrate the technical scheme of the utility model, the following specific embodiments are described, only the part related to the embodiment of the utility model is shown.

[0043] Embodiment one:

[0044] As Figure 1As shown, the utility model provides a heater control device, including a microcontroller 2, a power module 1, a control detection module 3 and an adjustment module 4; the input end of the power module 1 is connected to the power supply, and the output end is connected to the microcontroller 2, and the power module 1 is used to output direct current; the control detection module 3 includes a control unit 31 and a load detection unit 32, the input end of the control unit 31 is connected to the output end of the microcontroller 2, and the output end is connected to the motor, and the control unit 31 is used to convert the direct current provided by the power module 1 into alternating current for use by the motor; the input end of the load detection unit 32 is connected to the motor through the control unit 31, and the output end is connected to the microcontroller 2, and the load detection unit 32 is used to collect the phase current of the motor during operation, and convert the phase current into voltage and send it to the microcontroller 2; one end of the adjustment module 4 is connected to the microcontroller 2, and the other end is connected to the motor, and the adjustment module 4 is used to receive the modulation signal of the microcontroller 2 according to the voltage conversion, and adjust the speed of the motor; the motor is a brushless DC motor.

[0045] Specifically, if Figure 2 、 Figure 4 As shown, the power module 1 is connected to the microcontroller 2 to provide power to the motor. It should be noted that the power module 1 can be connected to a transformer or a mains supply. In this embodiment, the model of the microcontroller 2 is FG8692S / TSSOP28.

[0046] like Figure 2 、 Figure 3 As shown, the control and detection module 3 is connected to the microcontroller 2 and the three phases of the motor. It includes a control unit 31 and a load detection unit 32. The control unit in the control and detection module 3 forms an inverter bridge to control the start and stop of the motor. The load detection unit 32 in the control and detection module 3 is connected to the motor through the control unit 31 at one end and directly to the microcontroller 2 at the other end. The load detection unit 32 can collect the phase current of the motor during operation, convert the phase current into voltage, and transmit it to the microcontroller 2.

[0047] Specifically, if Figure 2 、 Figure 5 As shown, after collecting the phase current, the load detection unit 32 will convert the phase current into voltage through itself and send the voltage to the microcontroller 2. The microcontroller 2 will convert the voltage into a corresponding modulation signal (PWM signal) and send the PWM signal to the adjustment module 4. The adjustment module 4 adjusts the speed of the motor according to the PWM signal, and finally achieves the purpose of adjusting the speed of the motor, which facilitates the adjustment of the motor speed while improving the speed change performance and control performance.

[0048] The control device described in this embodiment includes a microcontroller 2, a power supply module 1, a control detection module 3 and an adjustment module 4. The power supply module 1, the control detection module 3 and the adjustment module 4 are all connected to the microcontroller 2. The control detection module 3 can control the start of the motor, collect the phase current of the motor, convert the phase current, and finally the microcontroller 2 outputs a PWM signal to the adjustment module 4, uses PWM technology to adjust the input voltage of the motor, and finally adjusts the speed of the motor to improve its control performance, facilitate speed regulation, and enhance the user experience.

[0049] It should be noted that the motor in this embodiment is a brushless DC motor. Using brushless DC motors in heaters can fully leverage their advantages, such as high efficiency, low noise, and long life. The precise control characteristics of brushless DC motors enable heaters to adjust air volume and temperature as needed, providing a more comfortable and personalized heating experience. Furthermore, the low noise characteristics of brushless DC motors also make heaters quieter during operation, reducing disruption to people's daily lives and work.

[0050] The heater control device in this embodiment can adjust the speed of the motor through PWM technology, thereby improving the control performance of the heater.

[0051] As an optional implementation, Figure 4 As shown, the power module 1 includes a power detection unit, the input end of which is connected to the power supply, and the output end of which is connected to the microcontroller 2. The power detection unit is used to detect the power supply voltage of the power supply and then supply it to the microcontroller 2. Specifically, the power detection unit is used to detect the power supply and then supply it to the microcontroller 2.

[0052] As an optional implementation, Figure 4 As shown, the power supply module 1 also includes a voltage stabilizing unit, the input of which is connected to the power supply, and the output of which is connected to the microcontroller 2. The voltage stabilizing unit includes a voltage stabilizing chip and a voltage stabilizing diode. The voltage stabilizing unit is used to convert a high-voltage input into a low-voltage output, stabilizing the voltage provided by the power supply and supplying it to the microcontroller 2. The input of the voltage stabilizing unit is used to receive the power supply voltage. After receiving the power supply voltage, it can stabilize the input power supply voltage and output a 3.3V voltage for use by the microcontroller 2. The voltage stabilizing unit in this embodiment includes a voltage stabilizing chip and a voltage stabilizing diode, and the specific voltage stabilization process is carried out by the voltage stabilizing chip and the voltage stabilizing diode. The voltage stabilizing chip model in this embodiment is CXM7533, and the voltage stabilizing diode model is SMBJ28CA. The CXM7533 voltage stabilizing chip has excellent circuit anti-interference capabilities, is easy to operate, can provide a stable 3.3V output, and has excellent accuracy and reliability. The SMBJ28CA is a bidirectional TVS transient suppression diode, mainly used to protect electronic equipment from voltage surges and overvoltage damage.

[0053] As an optional implementation, Figure 3 As shown, the control unit includes a U-phase control unit 31, a V-phase control unit 32 and a W-phase control unit 33; the U-phase control unit 31, the V-phase control unit 32 and the W-phase control unit 33 respectively include a first control chip, a second control chip and a third control chip; the G1 pin of the first control chip is connected to the UL pin of the microcontroller 2, and the G2 pin is connected to the UH pin of the microcontroller 2; the G1 pin of the second control chip is connected to the VL pin of the microcontroller 2, and the G2 pin is connected to the VH pin of the microcontroller 2; the G1 pin of the third control chip is connected to the WL pin of the microcontroller 2, and the G2 pin is connected to the WH pin of the microcontroller 2.

[0054] The first control chip in the U-phase control unit 31, the second control chip in the V-phase control unit 32, and the third control chip in the W-phase control unit 33 are used to receive level signals sent by the microcontroller. The U-phase control unit 31, the V-phase control unit 31, and the W-phase control unit 31 are respectively connected to the U-phase, V-phase, and W-phase of the motor to form an inverter bridge to control the starting and stopping of the motor.

[0055] Specifically, the models of the first control chip, the second control chip, and the third control chip are all AP2716SD.

[0056] As an optional implementation, Figure 3 As shown, the load detection unit 32 includes a U-phase load detection unit, a V-phase load detection unit and a W-phase load detection unit; the U-phase load detection unit is respectively connected to the S1 pin of the first control chip and the AIO3 pin and AIO2 pin of the microcontroller 2; the V-phase load detection unit is respectively connected to the S1 pin of the second control chip and the AIO9 pin of the microcontroller 2; the W-phase load detection unit is respectively connected to the S1 pin of the third control chip and the AIO1 pin and AIO0 pin of the microcontroller 2; the U-phase load detection unit, the V-phase load detection unit and the W-phase load detection unit collect the phase current of the motor through the first control chip, the second control chip and the third control chip respectively.

[0057] Specifically, the U-phase load detection unit, the V-phase load detection unit and the W-phase load detection unit respectively collect the phase current of the motor during operation through the first control chip, the second control chip and the third control chip. After detecting the phase current, the phase current is converted into voltage and sent to the microcontroller 2. The microcontroller 2 is used to control the voltage output to the motor according to the voltage sent by the load detection unit 32, and send a PWM signal to the adjustment module 4, using PWM technology to adjust the input voltage of the motor to achieve precise speed control.

[0058] It should be noted that the load detection unit 32 automatically collects the phase current of the motor during operation, and the phase current includes Ia, Ib, and Ic. It can be understood that the automatic collection can be different sampling methods including single-resistance sampling, dual-resistance sampling, three-resistance sampling, and power device internal resistance sampling; that is, the coordinate axis transformation in the sensed FOC controller includes CLARKE transformation and PARK transformation, which is used to transform the three-phase rotating coordinate axis current Ia, Ib, and Ic into D, Q axis vertical coordinate axis ID, IQ current signals through the angle θ; the current loop control is used to control the current according to the D axis reference current IDREF and the Q axis reference current IQEF. IQREF and feedback current signal D-axis feedback current IDREF, Q-axis feedback current signal IQREF, through the PI algorithm of the PI controller to control the D-axis and Q-axis currents and input them to UD and UQ voltage signals; the coordinate axis inverse transformation is used to transform the D, Q vertical coordinate axis UD, UQ signals into α, β vertical rotation coordinate axis Uα, Uβ voltage signals; finally, the α, β vertical rotation coordinate axis Uα, Uβ voltage signals are transformed into three-phase U, V, W output duty cycle voltage signals, and finally the microcontroller 2 adjusts the motor speed through this duty cycle voltage signal (PWM signal). The conversion formula is:

[0059] Ia+Ib+Ic=0;

[0060] Iα=Ia;

[0061]

[0062] ID=Iα×cosθ+Iβ×sinθ;

[0063] IQ=Iβ×cosθ-Iα×sinθ;

[0064] Vα=VD×cosθ-VQ×sinθ;

[0065] Vβ=VD×sinθ+VQ×cosθ;

[0066] Vu=Vα;

[0067]

[0068] As an optional implementation, Figure 5 As shown, the regulation module 4 includes a connector having four pins. The first pin of the connector is connected to the power supply; the second pin of the connector is grounded; the third pin of the connector is connected to the PC5 / PWM pin of the microcontroller 2 and is used to receive the modulation signal sent by the microcontroller 2 to adjust the motor speed; the fourth pin of the connector is connected to the PA0 pin of the microcontroller 2 and is used to send the motor's FG signal to the microcontroller 2. The connector model is X H2.54-4P.

[0069] Specifically, one end of the regulation module 4 is connected to the microcontroller 2 and the other end is connected to the motor. A connector is provided in the regulation module 4, and the third pin of the connector is connected to the PC5 / PWM pin of the microcontroller 2. After receiving the motor phase current detected by the load detection unit 32, the microcontroller 2 can control the voltage output to the motor and send a PWM signal to the regulation module 4. The regulation module 4 controls the motor speed and linearly controls the motor speed by adjusting the duty cycle of the PWM signal, achieving energy saving and noise reduction. The fourth pin of the connector is connected to the PA0 pin of the microcontroller 2, and can send the FG signal automatically generated within the motor to the microcontroller 2 to obtain real-time motor speed information.

[0070] The embodiment is only a special example and does not indicate that the present invention is implemented in such a way.

[0071] Example 2:

[0072] The second embodiment of the present invention further provides a heater, which includes the heater control device described in the first embodiment.

[0073] The above description is merely a preferred embodiment of the present invention. Those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A heater control device, characterized in that: Including microcontroller, power module, control detection module and regulation module; The input end of the power module is connected to the power supply, and the output end is connected to the microcontroller, and the power module is used to output direct current; The control detection module includes a control unit and a load detection unit. The input end of the control unit is connected to the output end of the microcontroller, and the output end is connected to the motor. The control unit is used to start the motor; the input end of the load detection unit is connected to the motor through the control unit, and the output end is connected to the microcontroller. The load detection unit is used to collect the phase current of the motor during operation, and convert the phase current into voltage and send it to the microcontroller. One end of the regulating module is connected to the microcontroller, and the other end is connected to the motor. The regulating module is used to receive the modulation signal converted by the microcontroller according to the voltage and adjust the speed of the motor; The motor is a brushless DC motor.

2. The heater control device according to claim 1, characterized in that: The adjustment module includes a connector; The connector includes four pins; the first pin of the connector is connected to the power supply; the second pin of the connector is grounded; the third pin of the connector is connected to the PC5 / PWM pin of the microcontroller, for receiving the modulation signal sent by the microcontroller and adjusting the speed of the motor; the fourth pin of the connector is connected to the PA0 pin of the microcontroller, for sending the FG signal of the motor to the microcontroller.

3. The heater control device according to claim 2, characterized in that: The model of the connector is XH2.54-4P.

4. The heater control device according to claim 1, characterized in that: The power module includes a power detection unit, the input end of the power detection unit is connected to the power supply, and the output end is connected to the microcontroller; the power detection unit is used to detect the supply voltage of the power supply and then supply it to the microcontroller.

5. The heater control device according to claim 1, characterized in that: The power supply module also includes a voltage stabilizing unit, the input end of the voltage stabilizing unit is connected to the power supply, and the output end is connected to the microcontroller; the voltage stabilizing unit includes a voltage stabilizing chip and a voltage stabilizing diode, and the voltage stabilizing unit is used to convert a high voltage input into a low voltage output, and stabilize the voltage provided by the power supply and supply it to the microcontroller.

6. The heater control device according to claim 5, characterized in that: The model of the voltage regulator chip is CXM7533, and the model of the voltage regulator diode is SMBJ28CA.

7. The heater control device according to claim 1, characterized in that: The control unit includes a U-phase control unit, a V-phase control unit and a W-phase control unit; The U-phase control unit, the V-phase control unit and the W-phase control unit respectively include a first control chip, a second control chip and a third control chip; The G1 pin of the first control chip is connected to the UL pin of the microcontroller, and the G2 pin is connected to the UH pin of the microcontroller; the G1 pin of the second control chip is connected to the VL pin of the microcontroller, and the G2 pin is connected to the VH pin of the microcontroller; the G1 pin of the third control chip is connected to the WL pin of the microcontroller, and the G2 pin is connected to the WH pin of the microcontroller; The U-phase control unit, the V-phase control unit and the W-phase control unit control the U-phase, V-phase and W-phase of the motor through the first control chip, the second control chip and the third control chip respectively to control the start and stop of the motor.

8. The heater control device according to claim 7, characterized in that: The load detection unit includes a U-phase load detection unit, a V-phase load detection unit and a W-phase load detection unit; The U-phase load detection unit is connected to the S1 pin of the first control chip and the AIO3 pin and AIO2 pin of the microcontroller respectively; The V-phase load detection unit is connected to the S1 pin of the second control chip and the AIO9 pin of the microcontroller respectively; The W-phase load detection unit is connected to the S1 pin of the third control chip and the AIO1 pin and AIO0 pin of the microcontroller respectively; The U-phase load detection unit, the V-phase load detection unit, and the W-phase load detection unit collect the phase current of the motor through the first control chip, the second control chip, and the third control chip, respectively.

9. The heater control device according to claim 1, characterized in that: The model of the microcontroller is FG8692S / TSSOP28.

10. A fan heater, characterized in that: It comprises the heater control device as described in any one of claims 1-9.

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