Blower device

Abstract

Electronic components related to constant air volume control are collected on a motor control substrate (18), which is a motor-side substrate, and a target air volume acquisition unit (27) belonging to a motor unit (6) and a target air volume switching unit (17) belonging to a power source unit (8) are connected by a connector (32) so as to be capable of communicating with each other. Provided is a blower device in which information relating to a target air volume Qs set by the target air volume switching unit (17) of the power source unit (8) is transmitted to the target air volume acquisition unit (27) of the motor unit (6) via the connector (32), whereby air volume constant control is made possible in the motor control substrate (18).

Description

air blower

[0001] The present invention relates to a blower device.

[0002] 2. Description of the Related Art Conventionally, a ventilation device that can be used as an air blower is known to have a configuration in which the air volume is controlled to a constant value so as to coincide with a target air volume (see, for example, Patent Document 1).

[0003] The configuration will be described below with reference to Fig. 10. Fig. 10(a) is a side view showing a conventional ventilation device 101 attached to a ceiling, and Fig. 10(b) is a block diagram showing the configuration of a sensorless brushless DC motor 106 and a control circuit 108 in the conventional ventilation device.

[0004] As shown in Figure 10(a), a conventional ventilation device 101 is installed in the ceiling space inside a room and has an intake port 102a below a main body 102. An adapter 103 is installed on the side of the main body 102 and is connected to an exhaust port installed on an exterior wall or the like through an exhaust duct 104. Inside the main body 102, there are blades 105 and a sensorless brushless DC motor 106 that rotates the blades 105. The intake port 102a is equipped with a louver 107 that covers the intake port 102a. A control circuit 108 that drives the sensorless brushless DC motor 106 is also installed inside the main body 102. A remote control device 109 (a switch that integrates a power on / off switch 109a and a fan notch setting switch 109b) is installed on a wall inside the room and is connected to the control circuit 108.

[0005] In FIG. 10(b), AC voltage supplied from commercial power supply 110 is converted to DC by AC / DC conversion circuit 111, smoothed by smoothing capacitor 112, and applied to inverter circuit 113. Inverter circuit 113 sequentially energizes six switching elements to drive sensorless brushless DC motor 106. Sensorless brushless DC motor 106 is composed of stator 114 wound with windings and rotor 115 equipped with magnets. Current detection unit 116 detects the current of each phase flowing through sensorless brushless DC motor 106, and rotation detection unit 117 calculates the rotation speed and position of sensorless brushless DC motor 106. Target airflow calculation unit 118 calculates a target airflow corresponding to the setting of fan notch setting switch 109b and notifies this target airflow to airflow calculation unit 119. Air volume calculation unit 119 compares the output air volume calculated based on the current detected by current detection unit 116 and the rotation speed detected by rotation detection unit 117 with the target air volume. If the output air volume is smaller than the target air volume, air volume calculation unit 119 instructs inverter circuit 113 via speed control unit 120 to output a larger duty. If the output air volume is larger than the target air volume, air volume calculation unit 119 instructs inverter circuit 113 via speed control unit 120 to output a smaller duty. With this configuration, the rotation speed of sensorless brushless DC motor 106 is varied to output the required air volume.

[0006] JP 2015-10530 A

[0007] In the ventilation device disclosed in Patent Document 1, electronic components such as an air volume calculation unit are mounted on a control circuit provided independently of the sensorless brushless DC motor. The sensorless brushless DC motor and the control circuit are then connected to receive power from a power source, achieving constant air volume control. Patent Document 1 discloses, as an example, a configuration in which a three-phase sensorless brushless DC motor is connected to an inverter circuit having six switching elements. In this case, three arms, each consisting of two switching elements connected in series to a DC voltage, are connected in a three-phase bridge configuration, and a three-phase PWM voltage is applied to the motor. In other words, the control circuit and the sensorless brushless DC motor are connected to a power source by three wires, thereby supplying the power required for constant air volume control.

[0008] Now consider what happens when the motor type is changed from three-phase to single-phase. With a single-phase motor, for example, the inverter circuit has four switching elements, and two wires connect the motor and control circuit. In other words, in order to reflect constant airflow control in the motor when changing the motor type, it was necessary to change the number of switching elements in the control circuit and also change the method of connecting the motor and control circuit. In other words, because the process for connecting the motor and power supply differs depending on the type of motor implemented, manufacturing costs tend to increase as product variations increase.

[0009] An object of the present invention is to provide a blower device that reduces manufacturing costs by using a structure that allows a motor to be connected to a power source regardless of the type of motor to be mounted.

[0010] In order to achieve the above object, the present invention provides a blower device having a power supply unit and a motor unit, wherein the power supply unit includes a power supply board that converts a supplied power supply voltage into a predetermined converted voltage, and a target air volume switching unit that switches the setting of a target air volume, and the motor unit is provided independently of the power supply unit and includes a motor drive circuit unit that outputs supplied power, a motor drive unit that rotates upon receiving the supply of power, and a motor control board that controls the motor drive unit, and the motor control board includes a target air volume acquisition unit that acquires a target air volume, a rotation speed detection unit that detects the rotation speed of the motor drive unit, and a predetermined converted voltage corresponding to the converted voltage. The device is equipped with a first converted current detection unit that detects the magnitude of the current, and a constant air volume calculation unit that calculates the supply power for constant air volume control at the target air volume based on the rotation speed detected by the rotation speed detection unit and the magnitude of the converted current detected by the first converted current detection unit, and the motor drive circuit unit outputs the supply power obtained by the calculation to the motor drive unit, and the target air volume acquisition unit has a connector that electrically connects the target air volume acquisition unit belonging to the motor unit and the target air volume switching unit belonging to the power supply unit, and the target air volume setting of the target air volume switching unit belonging to the power supply unit is acquired via the connector, thereby achieving the desired purpose.

[0011] According to the present invention, it is possible to provide a blower device whose manufacturing costs are reduced by using a structure that allows a motor to be connected to a power source regardless of the type of motor to be mounted.

[0012] FIG. 1 is a side view showing the configuration of a blower according to an embodiment of the present invention; FIG. 2 is a block diagram showing the configuration of a power supply unit and a motor unit according to an embodiment of the present invention; FIG. 3 is a block diagram showing the configuration of a power supply unit and a motor unit according to a first modified example of the present invention; FIG. 4 is a block diagram showing the configuration of a power supply unit and a motor unit according to a second modified example of the present invention; FIG. 5 is a block diagram showing the configuration of a power supply unit and a motor unit according to a sixth modified example of the present invention; FIG. 6 is a block diagram showing the configuration of a conventional ventilation device when the motor unit according to an embodiment of the present invention is single-phase;

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the following embodiments are examples of the present invention and do not limit the technical scope of the present invention. Furthermore, the same components are designated by the same reference numerals throughout the drawings, and their description will be omitted. Furthermore, in each drawing, detailed descriptions of components not directly related to the present invention will be omitted.

[0014] (Embodiment) A blower according to an embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a side view showing the configuration of the blower 1. In this embodiment, an air blower that can also be used as a ventilation fan installed on the ceiling of a room will be described as an example, but the air blower may have any configuration as long as it is capable of blowing air.

[0015] The fan 1 blows air drawn in from outdoors, for example, through a duct 4, into a room. The fan 1 includes a main body case 2, an adapter 3, a louver 7, a power supply unit 8, a motor unit 6, blades 5, a remote control device 9, and a connector 32.

[0016] The main body case 2 is formed in a hollow box shape and forms the outer shell of the blower device 1. The main body case 2 is fixed to an opening in the ceiling of a room, for example. The main body case 2 draws in air through an intake port 2a provided on one side of the box shape and blows out air from an outlet port 2b provided on the bottom surface of the box shape.

[0017] The adapter 3 is provided on one side of the main body case 2 and connects the main body case 2 and the duct 4 in a manner that allows ventilation. In other words, the adapter 3 connects the suction port 2a and the duct 4.

[0018] The louver 7 has an air vent for allowing air in the room to pass into the inside of the main body case 2. The louver 7 is disposed vertically below the main body case so as to cover the air outlet 2b.

[0019] The motor unit 6 rotates when power is supplied to the blower device 1. The motor unit 6 is provided on the top surface of the box-shaped main body case 2. Details of the motor unit 6 will be described later.

[0020] The power supply unit 8 is provided on the top surface of the box-shaped main body case 2, and converts the voltage supplied from the power supply into a predetermined voltage and supplies it to the motor unit 6. Note that the power supply unit 8 may be provided anywhere in the main body case 2 as long as it can supply the predetermined voltage to the motor unit 6. Details of the power supply unit 8 will be described later.

[0021] The blades 5 are provided inside the main body case 2 and rotate together with the motor unit 6 to blow air into the living room.

[0022] The remote control device 9 is disposed on a wall of the living room and receives instructions for controlling the air blower 1. The remote control device 9 is provided with, for example, a power switch 9a for switching the air blower 1 on and off, and a fan notch switch 9b for setting the airflow volume of the air blower 1. Note that the remote control device 9 may be provided in any manner, whether wired or wireless, as long as it is connected to the air blower 1 so as to be able to communicate with it.

[0023] The connector 32 communicatively connects the power supply unit 8 and the motor unit 6. For example, one end of the connector 32 is electrically connected to the power supply unit 8, and the other end is electrically connected to the motor unit 6. With this configuration, the motor unit 6 can obtain the airflow volume setting of the fan notch switch 9b from the power supply unit 8.

[0024] The configuration of the blower 1 in this embodiment is an example. For example, the blower 1 may be used as a ventilation fan that rotates the blades 5 in the reverse direction to draw air from the living room through the outlet 2b and blow it out through the inlet 2a.

[0025] Next, the configurations of the power supply unit 8 and the motor unit 6 will be described in detail with reference to FIG. 2 . FIG. 2 is a block diagram showing the configurations of the power supply unit 8 and the motor unit 6. In FIG. 2 , a power supply voltage is supplied to the power supply unit 8 from a commercial power supply 10. In the following description, the AC voltage supplied from the commercial power supply 10 will be referred to as the power supply voltage, and the AC current corresponding to the power supply voltage will be referred to as the power supply current. Furthermore, the DC voltage that has been rectified from AC to DC by a converter 12 (described below) and before its magnitude is converted by a voltage conversion unit 14 (described below) will be referred to as the pre-conversion voltage, and the DC current corresponding to the pre-conversion voltage will be referred to as the pre-conversion current. Furthermore, the DC voltage after its magnitude is converted by the voltage conversion unit 14 will be referred to as the converted voltage, and the DC current corresponding to the converted voltage will be referred to as the converted current.

[0026] The power supply unit 8 includes a power supply board 11 and a target air volume switching unit 17 .

[0027] Power supply board 11 converts the power supply voltage supplied from commercial power supply 10 into a converted voltage usable by the motor unit using electronic components mounted on it. Power supply board 11 includes converter 12, smoothing capacitor 13, voltage conversion unit 14, isolated voltage detection unit 15, and power supply control unit 16.

[0028] The converter 12 rectifies the AC voltage supplied from the commercial power supply 10 into DC. The converter 12 is provided by connecting four diodes in a diamond shape, for example, as shown in FIG.

[0029] Smoothing capacitor 13 smoothes the pulsating component contained in the voltage rectified by converter 12. In this way, converter 12 and smoothing capacitor 13 rectify and smooth the power supply voltage supplied from commercial power supply 10 into a pre-conversion voltage, which is a DC voltage.

[0030] The voltage conversion unit 14 is composed of a primary coil to which a pre-conversion voltage is applied and a secondary coil to which a post-conversion voltage is generated, and converts the magnitude of the voltage depending on the difference in the number of turns between the primary coil and the secondary coil. In the voltage conversion unit 14, magnetic flux is generated by applying the pre-conversion voltage to the primary coil, and the generated magnetic flux crosses the secondary coil, thereby converting the pre-conversion voltage into a post-conversion voltage of a predetermined magnitude. Here, the predetermined magnitude of voltage is a voltage of a magnitude required for the motor unit 6, and in this embodiment, it is converted to 29 V, for example.

[0031] It is preferable that the secondary coil be insulated from the primary coil in the voltage conversion unit 14. In other words, the power supply board 11 is electrically insulated before and after conversion to the converted voltage. Insulating the primary and secondary coils prevents the converted current from entering anything other than the target airflow switching unit 17 and the motor drive circuit unit 21 (described later).

[0032] The insulated voltage detection unit 15 detects the magnitude of the converted voltage obtained by the voltage conversion unit 14. The insulated voltage detection unit 15 is electrically insulated from the primary coil, similar to the secondary coil in the voltage conversion unit 14.

[0033] The power supply control unit 16 adjusts the magnitude of the voltage applied to the primary coil by controlling the ON / OFF ratio of the switching elements that perform opposing ON / OFF operations. For example, if the magnitude of the converted voltage detected by the insulated voltage detection unit 15 is greater than 29 V, the power supply control unit 16 reduces the ON ratio of the switching elements, and if the magnitude of the converted voltage is less than 29 V, the power supply control unit 16 increases the ON ratio of the switching elements, thereby controlling the magnitude of the converted voltage to a predetermined magnitude.

[0034] The target air volume switching unit 17 switches the setting of the target air volume Qs in accordance with the air volume commanded by the fan notch switch 9b in Fig. 1. The target air volume switching unit 17 is, for example, a variable resistor connected to the secondary coil in the voltage conversion unit 14, and may be configured to divide the converted voltage by increasing the resistance value as the target air volume Qs increases.

[0035] The motor unit 6 is a three-phase motor and is provided independently of the power supply unit 8. The motor unit 6 includes a motor drive unit 19, a motor control board 18, and a housing 20.

[0036] The motor drive unit 19 is composed of a rotor with a magnet and a stator wound with windings. The windings here are star-connected coils consisting of three windings provided for each of the three phases, U, V, and W, i.e., three-phase windings. The motor drive unit 19 is driven by power supplied from the power supply unit 8, and rotates the blades 5 attached to the motor drive unit 19.

[0037] Motor control board 18 controls motor drive unit 19 using mounted electronic components. Motor control board 18 includes a motor drive circuit unit 21, a first converted current sensor 22, a first converted current detection unit 23, a rotation speed detection unit 24, a rotor position calculation unit 25, a rotation speed calculation unit 26, a motor drive logic generation unit 30, a target air volume acquisition unit 27, a constant air volume data storage unit 28, a constant air volume calculation unit 29, a modulation unit 31, and an advance angle adjustment unit 38.

[0038] The motor drive circuit unit 21 is an inverter circuit equipped with six switching elements that perform opposing ON / OFF operations. The motor drive circuit unit 21 is composed of an upper stage and a lower stage, and three arms, each consisting of two switching elements connected in series, are connected in a three-phase bridge configuration to convert the converted DC voltage into a three-phase PWM AC voltage and apply it to the motor drive unit 19. In other words, the motor drive circuit unit 21 outputs supply power to the motor drive unit 19, which is the power required to drive the motor drive unit 19.

[0039] The first post-conversion current sensor 22 is, for example, a shunt resistor, and amplifies a voltage generated by a current flowing through this shunt resistor and outputs the amplified voltage to the first post-conversion current detection unit 23 .

[0040] The first converted current detection unit 23 detects a converted current corresponding to the converted voltage based on the magnitude of the voltage amplified by the first converted current sensor 22 .

[0041] The rotation speed detection unit 24 detects the rotation speed of the motor drive unit 19. The rotation speed detection unit 24 is, for example, a Hall element, and detects a change in the magnetic field caused by the rotation of the rotor in the motor drive unit 19. A single rotation speed detection unit 24 may be provided, or multiple rotation speed detection units 24 may be provided.

[0042] The rotor position calculation unit 25 calculates the rotational position of the motor drive unit 19 based on the change in the magnetic field of each phase of the motor drive unit 19 detected by the rotation speed detection unit 24 .

[0043] The rotation speed calculation unit 26 calculates the rotation speed of the motor drive unit 19 based on the change in the magnetic field of each phase of the motor drive unit 19 detected by the rotation speed detection unit 24 .

[0044] The motor drive logic generation unit 30 determines how to energize the six switching elements based on the rotational position of the motor drive unit 19 calculated by the rotor position calculation unit 25. In other words, the motor drive logic generation unit 30 determines what kind of rotating magnetic field is to be generated in the stator of the motor drive unit 19.

[0045] The target airflow acquisition unit 27 acquires the target airflow Qs set by the target airflow switching unit 17. Here, the target airflow acquisition unit 27 belongs to the motor unit 6, and the target airflow switching unit 17 belongs to the power supply unit 8, which is independent from the motor unit 6. The target airflow acquisition unit 27 belonging to the motor unit 6 is communicatively connected to the target airflow switching unit 17 belonging to the power supply unit 8 via a connector 32. In other words, the target airflow acquisition unit 27 and the target airflow switching unit 17 are electrically connected via the connector 32. The target airflow acquisition unit 27 can acquire the target airflow Qs set by the target airflow switching unit 17 via the connector 32. In other words, the target airflow acquisition unit 27 can acquire the airflow setting of the fan notch switch 9b via the connector 32. The target airflow acquisition unit 27 determines the magnitude of the target airflow Qs based on, for example, the magnitude of the divided voltage obtained by dividing the converted voltage by the target airflow switching unit 17.

[0046] The connection by the connector 32 may be detachable. In other words, the motor unit 6 is provided to be detachably connected to the power supply unit 8 by the connector 32.

[0047] The constant air volume data storage unit 28 stores the relationship between the converted current, the rotation speed of the motor drive unit 19, and the output air volume Qn of the blower 1. The constant air volume data storage unit 28 has a plurality of storage units corresponding to the fan notch switches 9b, and can select which of the plurality of storage units the data of which to use based on the target air volume Qs acquired by the target air volume acquisition unit 27.

[0048] The constant airflow calculation unit 29 increases or decreases the duty instruction value so that the relationship between the converted current and the rotation speed of the motor drive unit 19 becomes a predetermined relationship. Here, the predetermined relationship is the relationship stored in the constant airflow data storage unit 28. The constant airflow calculation unit 29 compares the output airflow Qn calculated based on the converted current detected by the first converted current detection unit 23 and the rotation speed of the motor drive unit 19 calculated by the rotation speed calculation unit 26 to determine whether it is higher or lower than the target airflow Qs acquired by the target airflow acquisition unit 27. If the output airflow Qn is smaller than the target airflow Qs, the constant airflow calculation unit 29 instructs the motor drive logic generation unit 30 to output a larger duty. If the output airflow Qn is larger than the target airflow Qs, the constant airflow calculation unit 29 instructs the motor drive logic generation unit 30 to output a smaller duty. In other words, the constant airflow calculation unit 29 calculates the supply power required to perform constant airflow control at the target airflow Qs. In this way, the constant air volume calculation unit 29 performs calculations to reduce the deviation between the output air volume Qn and the target air volume Qs and perform constant air volume control.

[0049] The lead angle adjustment unit 38 adjusts the lead angle of the motor drive unit by correcting the phase of the rotating magnetic field determined by the motor drive logic generation unit 30 based on the calculation by the constant air volume calculation unit 29.

[0050] The modulation unit 31 outputs pulses to the motor drive circuit unit 21 based on the duty instruction value of the constant air volume calculation unit 29. The modulation unit 31 changes the rotation speed of the motor drive circuit unit 19 by sequentially turning on the six switching elements at an ON / OFF ratio of a predetermined duty, thereby outputting the required air volume.

[0051] The housing 20 is the outer shell of the motor unit 6 and is formed, for example, in a hollow cylindrical shape. The motor control board 18 and the motor drive unit 19 are disposed inside the housing 20, and the housing 20 prevents foreign matter such as water and dust from adhering to the motor control board 18 and the motor drive unit 19.

[0052] Here, a case where the motor is single-phase will be described with reference to Fig. 9. Fig. 9 is a block diagram of a case where the motor section 6 in Fig. 2 is replaced with a motor section 6a that is a single-phase motor. Because it is a single-phase motor, the motor drive section 19a has one winding, i.e., a single-phase winding.

[0053] The motor drive circuit section 21a is provided with four switching elements, and two arms are connected to the motor drive section 19a to apply a voltage.

[0054] The target air volume acquisition unit 27 acquires the target air volume Qs set by the target air volume switching unit 17 via the connector 32 .

[0055] The constant air volume calculation unit 29 outputs a duty instruction value to the modulation unit 31 so as to reduce the deviation between the target air volume Qs acquired by the target air volume acquisition unit 27 and the output air volume Qn of the blower 1 .

[0056] The modulation unit 31 outputs pulses to the motor drive circuit unit 21a based on the duty instruction value of the constant air volume calculation unit 29. The modulation unit 31 changes the rotation speed of the motor drive circuit unit 19a by sequentially turning on the four switching elements at an ON / OFF ratio of a predetermined duty, thereby outputting the required air volume.

[0057] With this configuration, constant air volume control can be achieved even with the motor section 6a, which is a single-phase motor.

[0058] In Patent Document 1, constant air volume control is performed by a control circuit 108 that is independent of a sensorless brushless DC motor 106, as shown in FIG. 10(a).

[0059] In other words, the electronic components related to constant airflow control were concentrated on the control circuit 108 side, which obtained the airflow setting from the fan notch switch 9b. With this structure, if the motor type was changed, in order to reflect the constant airflow control in the motor, it was necessary to change the number of switching elements in the control circuit and also change the method of connecting the motor and control circuit. In other words, because the process for connecting the motor and power supply differed depending on the type of motor implemented, manufacturing costs tended to increase as product variations increased.

[0060] In the present invention, as shown in FIG. 2 , electronic components related to constant airflow control are integrated on the motor control board 18 belonging to the motor unit 6, and the target airflow acquisition unit 27 belonging to the motor unit 6 and the target airflow switching unit 17 belonging to the power supply unit 8 are communicatively connected via a connector 32. Information regarding the target airflow Qs set by the target airflow switching unit 17 of the power supply unit 8 is transmitted to the target airflow acquisition unit 27 of the motor unit 6 via the connector 32, thereby enabling constant airflow control on the motor control board 18. With this structure, even if the motor is single-phase as shown in FIG. 9 , constant airflow control can be achieved by connecting the target airflow switching unit 17 and the target airflow acquisition unit 27 via the connector 32, as in the case of a three-phase motor shown in FIG. 2 . In other words, a blower capable of constant airflow control can be realized by a common process of connecting the motor and the power supply with a single connector, regardless of the type of motor installed.

[0061] As described above, a blower capable of constant air volume control can be realized using a common process regardless of the motor implemented, so that a blower can be provided with reduced manufacturing costs even when product variations are increased.

[0062] The structure described in the embodiment is an example of the present invention and does not limit the technical scope of the present invention. Functions may be added as needed, or unnecessary functions may be removed. It is sufficient to provide a blower device 1 that reduces manufacturing costs by using a structure that connects the target air volume acquisition unit 27 belonging to the motor unit 6 and the target air volume switching unit 17 belonging to the power supply unit 8 via a connector 32 so that they can communicate with each other. In the modified examples described below, several structures with functions different from those of the embodiment will be described.

[0063] (Modification 1) Modification 1 of the embodiment will be described with reference to Fig. 3. In Fig. 3, the power supply board 11 includes a pre-conversion current sensor 33 and a pre-conversion current detection unit 34.

[0064] The pre-conversion current sensor 33 is, for example, a shunt resistor connected to the primary coil of the voltage conversion unit 14 , and amplifies the voltage generated by the current flowing through this shunt resistor and outputs it to the pre-conversion current detection unit 34 .

[0065] The pre-conversion current detection unit 34 detects the pre-conversion current corresponding to the pre-conversion voltage based on the magnitude of the voltage amplified by the pre-conversion current sensor 33 .

[0066] The power supply control unit 16 controls the ON / OFF ratio of the switching elements based on the magnitude of the pre-conversion current detected by the pre-conversion current detection unit 34. For example, if the magnitude of the detected pre-conversion current is greater than a current threshold, which is a threshold for overcurrent, the power supply control unit 16 turns off the switching elements or reduces the ON ratio of the switching elements. In other words, if the magnitude of the pre-conversion current is equal to or greater than a predetermined current threshold, the power supply control unit 16 stops or limits the supply of the post-conversion voltage to the motor unit 6.

[0067] With this configuration, the pre-conversion current flowing through the primary coil of the voltage conversion unit 14 is limited so as not to become an overcurrent, and the post-conversion current output from the secondary coil can also be limited to a value that does not become an overcurrent.

[0068] (Modification 2) Next, Modification 2 of the embodiment will be described with reference to Fig. 4. In Fig. 4, the power supply substrate 11 includes a second converted current sensor 35 and a second converted current detection unit 36.

[0069] The second post-conversion current sensor 35 is, for example, a shunt resistor connected to the secondary coil of the voltage conversion unit 14, and amplifies the voltage generated by the current flowing through this shunt resistor and outputs it to the second post-conversion current detection unit 36.

[0070] The second converted current detection unit 36 ​​detects a converted current corresponding to the converted voltage based on the magnitude of the voltage amplified by the second converted current sensor 35 .

[0071] The power supply control unit 16 controls the ON / OFF ratio of the switching elements based on the magnitude of the converted current detected by the second converted current sensor 35. For example, if the magnitude of the detected converted current is greater than the current threshold, which is the threshold for overcurrent, the power supply control unit 16 turns off the switching elements or reduces the ON ratio of the switching elements. In other words, if the magnitude of the converted current is equal to or greater than a predetermined current threshold, the power supply control unit 16 stops or limits the supply of converted voltage to the motor unit 6.

[0072] Since the magnitude of the converted current flowing to the motor unit 6 is detected and the magnitude of the pre-conversion current flowing to the primary coil is controlled, the converted current can be limited to a value that does not become an overcurrent more accurately than in variant 1.

[0073] (Modification 3) Next, Modification 3 of the embodiment will be described with reference to Fig. 5. In Fig. 5, the motor control board 18 includes a converted voltage detection unit 37.

[0074] The converted voltage detection unit 37 detects the magnitude of the converted voltage on the motor control board 18 and outputs it to the constant air volume calculation unit 29. In other words, the converted voltage detection unit 37 detects the magnitude of the converted voltage applied to the motor drive circuit unit 21.

[0075] Constant air volume calculation unit 29 compares the voltage required for the power supplied from motor drive circuit unit 21 to motor drive unit 19 with the magnitude of the converted voltage detected by converted voltage detection unit 37, and corrects the calculation of constant air volume control based on the difference. For example, if the converted voltage is smaller, the duty instruction value is increased, and if the converted voltage is larger, the duty instruction value is decreased.

[0076] With this configuration, even if the conversion accuracy in the voltage conversion unit 14 is low, power can be stably supplied to the motor drive unit 19, so that constant air volume control can be achieved with high accuracy.

[0077] (Modification 4) Next, Modification 4 of the embodiment will be described with reference to Fig. 6. In Fig. 6, the motor control board 18 includes a modulation reflecting unit 39.

[0078] The modulation reflecting unit 39 feeds back the pulses output from the modulator 31 to the motor drive circuit unit 21 to the constant air volume calculation unit 29. In other words, the modulation reflecting unit 39 outputs to the constant air volume calculation unit 29 information about the duty ratio at which the pulses were output to the motor drive circuit unit 21.

[0079] Constant air volume calculation unit 29 compares the duty instruction value instructed by constant air volume calculation unit 29 with the duty ratio of the pulse output by modulation unit 31, and corrects the calculation of constant air volume control based on the difference. With this configuration, constant air volume control can be achieved with high precision, as in variant 3.

[0080] (Fifth Modification) Next, a fifth modification of the embodiment will be described with reference to Fig. 7. In Fig. 7, the power supply unit 8 includes a humidity sensor 40, a human detection sensor 41, and a delay switching timer .

[0081] Humidity sensor 40 is provided in power supply unit 8 and acquires the humidity of the space to which air is to be blown by blower 1, and outputs the acquired humidity to target airflow switching unit 17. Here, the space to which air is to be blown is, for example, a living room in which blower 1 is installed. If the humidity acquired by humidity sensor 40 is equal to or greater than a predetermined humidity threshold, target airflow switching unit 17 can switch target airflow Qs to a setting greater than target airflow Qs, thereby eliminating discomfort to the user at times of high humidity.

[0082] The human detection sensor 41 is provided in the power supply unit 8 and acquires the presence or absence of a person in the space to be blown by the air blower 1, and outputs the acquired information to the target air volume switching unit 17. The human detection sensor 41 detects the presence or absence of a person in the room in which the air blower 1 is installed, for example, by using infrared rays. When the human detection sensor 41 detects the absence of a person, the target air volume Qs can be switched to a setting smaller than the target air volume Qs, thereby enabling the air blower 1 to be operated in an energy-saving manner.

[0083] The delay switching timer 42 is a device that returns the airflow setting, which was switched based on the humidity sensor 40 or the human detection sensor 41, to the original target airflow Qs after a predetermined time has elapsed. When the time measured by the delay switching timer 42 exceeds a predetermined time threshold, the target airflow switching unit 17 returns the airflow setting to the original target airflow Qs. For example, if the humidity sensor 40 switches the setting to a setting greater than the target airflow Qs, the timer starts counting the time when the humidity changes from above the predetermined humidity threshold to below the humidity threshold. Also, if the human detection sensor 41 switches the setting to a setting less than the target airflow Qs, the timer starts counting the time when the humidity changes from not being present to being present. By measuring the predetermined time using the delay switching timer 42, the airflow setting can be prevented from being switched multiple times in a short period of time less than the time threshold, thereby stabilizing the operation of the blower device 1.

[0084] (Sixth Modification) Next, a sixth modification of the embodiment will be described with reference to Fig. 8. In Fig. 8, the power supply unit 8 includes a thermal fuse 43.

[0085] Thermal fuse 43 is provided between the second coil of voltage conversion unit 14 and motor drive circuit unit 21, and disconnects motor unit 6 and power supply unit 8 when the temperature of power supply unit 8 reaches or exceeds a predetermined temperature threshold. In other words, thermal fuse 43 stops the supply of voltage to motor unit 6 when the temperature of power supply unit 8 reaches or exceeds the predetermined temperature, thereby forcibly stopping blower 1. With this configuration, even if a fire breaks out near blower 1, blower 1 is forcibly stopped when the temperature of power supply unit 8 reaches or exceeds the predetermined temperature, preventing the fire from spreading to the surrounding area due to the air blown by the blower.

[0086] The air blower according to the present invention can be used, for example, as a ventilation fan installed on a ceiling.

[0087] REFERENCE SIGNS LIST 1 Fan device 2 Main body case 2a Intake port 2b Outlet port 3 Adapter 4 Duct 5 Blades 6, 6a Motor section 7 Louver 8 Power supply section 9 Remote control device 9a Power switch 9b Fan notch switch 10 Commercial power supply 11 Power supply board 12 Converter 13 Smoothing capacitor 14 Voltage conversion section 15 Insulated voltage detection section 16 Power supply control section 17 Target air volume switching section 18 Motor control board 19, 19a Motor drive section 20 Housing 21, 21a Motor drive circuit section 22 First converted current sensor 23 First converted current detection section 24 Rotation speed detection section 25 Rotor position calculation section 26 Rotation speed calculation section 27 Target air volume acquisition section 28 Constant air volume data storage section 29 Constant air volume calculation section 30 Motor drive logic generation section 31 Modulation section 32 Connector 33 Pre-conversion current sensor 34 Pre-conversion current detection unit 35 Second post-conversion current sensor 36 Second post-conversion current detection unit 37 Post-conversion voltage detection unit 38 Lead angle adjustment unit 39 Modulation reflection unit 40 Humidity sensor 41 Human detection sensor 42 Delay switching timer 43 Thermal fuse 101 Ventilation device 102 Main body 102a Intake port 103 Adapter 104 Exhaust duct 105 Blades 106 Sensorless brushless DC motor 107 Louver 108 Control circuit 109 Remote control device 109a Power on / off switch 109b Fan notch setting switch 110 Commercial power supply 111 AC / DC conversion circuit 112 Smoothing capacitor 113 Inverter circuit 114 Stator 115 Rotor 116 Current detection unit 117 Rotation detection unit 118 Target air volume calculation unit 119 Air volume calculation unit 120 Speed ​​control unit

Claims

1. A blower having a power supply unit and a motor unit, wherein the power supply unit comprises: a power supply board that converts a supplied power supply voltage into a predetermined converted voltage; and a target airflow switching unit that switches the setting of a target airflow, the motor unit is provided independently of the power supply unit and comprises: a motor drive circuit unit that outputs supply power, a motor drive unit that rotates upon receiving the supply of the supply power, and a motor control board that controls the motor drive unit, the motor control board comprises: a target airflow acquisition unit that acquires the target airflow, a rotation speed detection unit that detects the rotation speed of the motor drive unit, a first converted current detection unit that detects a magnitude of a predetermined converted current corresponding to the converted voltage, and a constant airflow calculation unit that calculates the supply power for constant airflow control at the target airflow based on the rotation speed detected by the rotation speed detection unit and the magnitude of the converted current detected by the first converted current detection unit, the motor drive circuit unit outputs the supply power obtained by the calculation to the motor drive unit, and the target airflow acquisition unit a connector that electrically connects the target airflow acquisition unit belonging to the motor unit and the target airflow switching unit belonging to the power supply unit, and the target airflow setting of the target airflow switching unit belonging to the power supply unit is acquired via the connector.

2. The blower device according to claim 1, wherein said motor unit is detachably provided with respect to said power supply unit.

3. The blower device of claim 1, wherein the target airflow switching unit is electrically connected to the power supply board and divides the converted voltage based on the setting of the target airflow, and the target airflow acquisition unit acquires the magnitude of the target airflow based on the magnitude of the divided voltage applied to the target airflow switching unit.

4. The blower device of claim 1, wherein the motor control board is provided with a converted voltage detection unit that detects the converted voltage converted by the power supply board, and the constant air volume calculation unit calculates the difference between the voltage required to output the supply power and the converted voltage detected by the converted voltage detection unit, and corrects the calculation of the constant air volume control based on the difference.

5. The blower device according to claim 1, wherein the motor control board is provided with a modulation section which modulates the supplied power based on a predetermined duty ratio, and the constant air volume calculation section corrects the calculation of the constant air volume control based on the duty ratio.

6. The blower device according to claim 1, wherein the motor control board is provided with an advance angle adjustment section that adjusts the advance angle of the motor drive section based on a calculation for the constant air volume control.

7. The blower device of claim 1, wherein the power supply unit includes a humidity sensor that acquires the humidity of the space to be blown air, and the target airflow switching unit switches the target airflow to a setting greater than the target airflow when the humidity acquired by the humidity sensor is equal to or greater than a predetermined humidity threshold.

8. The blower device of claim 7, wherein the power supply unit includes a delay switching timer that measures the time that has elapsed since the humidity acquired by the humidity sensor changed from above a predetermined humidity threshold to below the humidity threshold, and the target airflow switching unit returns the setting from a setting greater than the target airflow to the target airflow when the time measured by the delay switching timer is equal to or greater than the predetermined time threshold.

9. The blower device of claim 1, wherein the power supply unit is provided with a human detection sensor that detects the presence or absence of a person in the space to which air is being blown, and the target air volume switching unit switches the target air volume to a setting smaller than the target air volume when the human detection sensor detects the absence of a person.

10. The blower device of claim 9, wherein the power supply unit includes a delay switching timer that measures the time that has elapsed since the detection of the human detection sensor changed from the presence of a human to the absence of a human, and the target air volume switching unit returns the setting from a setting greater than the target air volume to the target air volume when the time measured by the delay switching timer is equal to or greater than a predetermined time threshold.

11. The blower device of claim 1, wherein the power supply unit is provided with: a second converted current detection unit that detects the magnitude of the converted current; and a power supply control unit that stops or limits the supply of the converted voltage to the motor unit when the magnitude of the converted current detected by the second converted current detection unit in the power supply unit is equal to or greater than a predetermined current threshold.

12. The blower device of claim 1, wherein the power supply board comprises: a converter that converts AC to DC; and a voltage conversion unit that converts the pre-conversion voltage converted to DC by the converter into the predetermined converted voltage; and the power supply unit comprises: a pre-conversion current detection unit that detects the magnitude of a predetermined pre-conversion current corresponding to the pre-conversion voltage; and a power supply control unit that stops or limits the supply of the converted voltage to the motor unit when the magnitude of the pre-conversion current detected by the pre-conversion current detection unit is equal to or greater than a predetermined current threshold.

13. The blower device according to claim 1, wherein the power supply board is electrically insulated before and after conversion to the converted voltage.

14. The blower device according to claim 1, wherein the motor section comprises a housing for housing the motor drive section and a motor board.

15. The blower device of claim 1, wherein the power supply unit is provided with a temperature fuse that stops the supply of the converted voltage from the power supply board to the motor unit when the temperature of the power supply unit is equal to or higher than a predetermined temperature threshold.

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