Power supply device, motor device and air supply device

Abstract

A power supply device, a motor device, and a blower device are provided. The power supply device comprises: a first power supply circuit that generates a direct current driving voltage from an alternating current voltage; a driving circuit that provides the driving voltage to a load; an input terminal; a second power supply circuit that generates a direct current operating voltage from the alternating current voltage from the input terminal; a signal generating circuit that outputs a control signal according to the alternating current voltage from the input terminal; a control circuit that operates by the operating voltage and generates a control voltage, and controls the driving circuit according to the control signal; and a switch circuit that includes a first switch element arranged on a wiring connecting the power supply terminal and the first power supply circuit, the switch circuit and the signal generating circuit being grounded to a ground point of the same potential, and the first switch element being turned on during the period of receiving the control signal.

Description

Technical Field

[0001] The invention relates to a power supply device, a motor device and an air supply device. Background Art

[0002] The power supply device described in WO2017-134824 includes: a full-wave rectifier circuit that rectifies AC power into DC; a power supply circuit that converts the output power of the full-wave rectifier circuit into a constant voltage and outputs it; and a drive signal output circuit that starts supplying DC power to a load.

[0003] The drive signal output circuit is provided with a switch, and when the user presses the switch, the drive signal is output, so that the DC power starts to be provided to the load. In addition, when the switch is disconnected, the DC power is stopped from being provided to the load.

[0004] Patent Document 1: WO2017-134824

[0005] The power supply device described in WO2017-134824 is provided with a drive signal output circuit at a position closer to the load side than the full-wave rectifier circuit and the power supply circuit. Therefore, depending on the timing of pressing the switch, the DC power supplied to the load may deviate, and the operation of the load may become unstable.

[0006] Furthermore, the switch is a switch for switching supply and cutoff of DC power. When adjusting the DC power supplied to the load according to the user's request, the user needs to operate a switch other than the above switch, which deteriorates the user's convenience. Summary of the invention

[0007] Therefore, an object of the present invention is to provide a power supply device, a motor device, and a blower device that can improve user convenience.

[0008] The power supply device of the example of the present invention comprises: a power supply terminal connected to an AC power supply; a first power supply circuit that generates a DC driving voltage required to drive the load from the AC voltage supplied from the power supply terminal; a driving circuit that supplies the driving voltage to the load; an input terminal that is arranged in parallel with the power supply terminal and can be connected to the AC power supply; a second power supply circuit that converts the AC voltage input from the input terminal into a DC and generates a DC operating voltage; a signal generating circuit that is arranged in parallel with the second power supply circuit and outputs a control signal according to the AC voltage input from the input terminal; a control circuit that operates with the operating voltage and generates a control voltage and controls the driving circuit according to the control signal; and a switching circuit that includes a first switching element arranged on a wiring connecting the power supply terminal and the first power supply circuit, the switching circuit and the signal generating circuit being grounded to a ground point of the same potential, and the first switching element being turned on while receiving the control signal.

[0009] According to the power supply device, the motor device, and the air blowing device of the exemplary embodiment of the present invention, the convenience of the user can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a front view showing an example of the air supply device of the present invention.

[0011] Figure 2 is set at Figure 1 A schematic wiring diagram of a motor device in the air supply device shown.

[0012] Figure 3 It is the equivalent circuit of a switching switch.

[0013] Figure 4 This is a wiring diagram of an example of the first signal generating circuit.

[0014] Figure 5 This is a wiring diagram of an example of a switching circuit.

[0015] Figure 6 This is a timing chart showing the operation of the power supply device after the first push button switch is pressed.

[0016] Figure 7 This is a timing chart showing the operation of the power supply device when the motor is stopped.

[0017] Description of symbols

[0018] 10: 1st power supply circuit; 20: 2nd power supply circuit; 21: half-wave rectifier circuit; 22: DC conversion circuit; 30: control circuit; 41: 1st signal generating circuit; 411: 1st voltage dividing circuit; 412: 2nd voltage dividing circuit; 42: 2nd signal generating circuit; 43: 3rd signal generating circuit; 50: switch circuit; 51: relay; 511: switch unit; 512: coil; 513: 1st terminal; 514: 2nd terminal; 515: 3rd terminal; 516 : 4th terminal; 60: drive circuit; 100: power supply device; 200: motor device; BS: base; Bt0: cut-off button switch; Bt1: 1st button switch; Bt2: 2nd button switch; Bt3: 3rd button switch; CW: changeover switch; Cb: cable; Ct: connector; CA: power supply terminal; C1: 1st input terminal; C2: 2nd input terminal; C3: 3rd input terminal; C41: capacitor; Fn: air supply device; Grr: ground connection Location; Grs: frame grounding point; Im: impeller; Im1: impeller cup; Im2: blade; L1: power wiring; M: motor; PL: support; Q41: first transistor; Q51: second transistor; R411: first resistor; R412: second resistor; R413: third resistor; R51: base resistor; R52: base-emitter resistor; Rx: discrimination resistor; SgC: control signal; SgD: drive signal; SgH: third control signal; SgL : The first control signal; SgM: The second control signal; Tb: Connecting terminal; Tn0: Cut-off terminal; Tn1: The first output terminal; Tn2: The second output terminal; Tn3: The third output terminal; Vac: AC voltage; Vac0: Power supply input voltage; Vac1: The first input voltage; Vac2: The second input voltage; Vac3: The third input voltage; Vcc1: The operating voltage; Vcc2: The control voltage; Vdc: The driving voltage; ZD41: The Zener diode. DETAILED DESCRIPTION

[0019] Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the direction parallel to the central axis Cx of the motor M is referred to as the "axial direction". In addition, the direction perpendicular to the central axis Cx is referred to as the "radial direction". The circumferential direction centered on the central axis Cx is referred to as the "circumferential direction". Figure 1 The air blowing device Fn shown is used as a reference to define up, down, left, and right. In addition, the above directions are for explanation purposes only and do not limit the positional relationship and directions between the air blowing device Fn and the motor M in the use state.

[0020] in addition, Figure 2 , Figure 4 , Figure 5The wiring diagrams are shown in FIG. 1 and FIG. 2. In the wiring diagrams used in the following description, the wiring for providing a DC voltage is represented by a solid line. The wiring for providing an AC voltage is represented by a bold solid line. In addition, the wiring for inputting a signal as a trigger for causing a circuit to operate or stop is represented by a dotted line.

[0021] <1. About the air supply device Fn>

[0022] Figure 1 This is a front view showing an example of the air blowing device Fn of the present invention. Figure 2 is set at Figure 1 FIG. 2 is a schematic wiring diagram of the motor device 200 in the air supply device Fn shown in FIG. Figure 1 As shown, the air supply device Fn is an electric fan. Figure 1 In the air supply device Fn shown, the central axis Cx is perpendicular to the paper surface.

[0023] like Figure 1 , Figure 2 As shown, the air supply device Fn includes a base BS, a support PL, a motor device 200, and an impeller Im. The motor device 200 includes a motor M and a power supply device 100 (see Figure 2 ). The motor M is driven by a DC voltage. The motor M is, for example, a brushless DC motor, but is not limited thereto. A motor driven by DC power can be widely used. The motor M has a shaft (not shown) that rotates around a central axis Cx by power supply from the power supply device 100.

[0024] The base BS is a stand of the air supply device Fn. The base BS is, for example, in the shape of a rectangular parallelepiped or a cylindrical shape. The base BS has a space inside, and houses the power supply device 100 of the motor device 200. The support PL extends upward from the upper surface of the base BS. A motor M is mounted on the upper end of the support PL. The support PL also has a space inside, similar to the base BS. A power line (not shown) for supplying power from the power supply device 100 to the motor M is arranged in the space inside the support PL.

[0025] The impeller Im is fixed to the shaft of the motor M, and rotates around the central axis by the rotation of the shaft. The impeller Im has an impeller cup Im1 and blades Im2. The impeller cup Im1 is in the shape of a covered cylinder, has a cover portion extending in a direction perpendicular to the central axis Cx, and has a cylinder portion extending axially from the radial outer edge of the cover portion. In the impeller Im, three blades Im2 are arranged at equal intervals in the circumferential direction. In addition, the blades Im2 are not limited to three. In addition, the arrangement of the blades Im2 may not be equal intervals.

[0026] The blade Im2 extends radially outward from the radial outer edge of the impeller cup Im1. Both ends of the blade Im2 in the axial direction are offset in the circumferential direction. Therefore, the impeller Im rotates to generate an airflow along the axial direction.

[0027] The base BS is provided with a changeover switch CW. The changeover switch CW includes four push button switches Bt0, Bt1, Bt2, and Bt3 protruding from the upper surface of the base BS. The push button switches Bt0, Bt1, Bt2, and Bt3 are switches pressed by the user.

[0028] In the following description, the button switches Bt1, Bt2, and Bt3 may be referred to as the first button switch Bt1, the second button switch Bt2, and the third button switch Bt3, respectively. Once the button switches Bt1, Bt2, and Bt3 are operated, they remain in the operated state until another button switch is operated.

[0029] The button switches Bt1, Bt2, and Bt3 are used, for example, to turn on the air supply device Fn and adjust the air volume, that is, to adjust the rotation speed of the motor M. In addition, in the air supply device of the present embodiment, by pressing the button switch Bt1, the motor M is operated at a weak speed (slow speed rotation). By pressing the button switch Bt2, the motor M is operated at a medium speed (medium speed rotation). In addition, by pressing the button switch Bt3, the motor M is operated at a strong speed (high speed rotation).

[0030] The push button switch Bt0 is a switch that is restored after being operated. When there is a push button switch that is maintained in an operated state, the push button switch Bt0 cancels the operated state of the push button switch. In the following description, the push button switch Bt0 may be referred to as the cut-off push button switch Bt0.

[0031] In addition, a cable Cb is provided on the base BS, and a connector Ct is provided at the front end of the cable Cb. The connector Ct is connected to a socket (not shown) provided on the wall of the room, for example, and is connected to the AC power line. That is, the AC voltage Vac is provided to the air supply device Fn via the connector Ct and the cable Cb. That is, the cable Cb is part of the AC wiring.

[0032] <2. Power supply device 100 >

[0033] The power supply device 100 receives the AC voltage Vac and drives the brushless DC motor M that operates using DC power. That is, the power supply device 100 receives the AC voltage Vac from the AC power source and drives and controls the DC load M. Figure 2 As shown, the power supply device 100 includes a first power supply circuit 10, a second power supply circuit 20, a control circuit 30, a first signal generating circuit 41, a second signal generating circuit 42, a third signal generating circuit 43, a switch circuit 50, and a drive circuit 60. In addition, the power supply device 100 includes a power supply terminal CA, a first input terminal C1, a second input terminal C2, and a third input terminal C3.

[0034] <2.1 Terminals CA, C1, C2, C3>

[0035] The power supply device 100 has a power supply terminal CA, a first input terminal C1, a second input terminal C2, and a third input terminal C3. The power supply terminal CA is connected to an AC power source. In addition, the power supply device 100 has a plurality of input terminals C1, C2, and C3. Figure 2 As shown, the power supply terminal CA is connected to the cable Cb and receives the AC voltage Vac from the cable Cb. That is, in this embodiment, the AC power source is an AC power line connected via the cable Cb and the connector Ct. However, this is not limited to this, and a wide range of structures that can provide AC power can be adopted.

[0036] The first input terminal C1 , the second input terminal C2 , and the third input terminal C3 are connectable to an AC power source. The first input terminal C1 , the second input terminal C2 , and the third input terminal C3 are connected to a switch CW.

[0037] Here, the changeover switch CW will be described in detail with reference to the drawings. Figure 3 is the equivalent circuit of the switching switch CW. Figure 2 , Figure 3 As shown, the switching switch CW is connected to one side of the AC wiring. The switching switch CW is a switch corresponding to the AC voltage. In addition, the AC wiring sometimes has, for example, a neutral line with a constant voltage (for example, a ground voltage) and a power line whose voltage is switched relative to the neutral line. In such a case, one side of the AC wiring is the power line. In addition, as long as the switching switch CW is a structure that can always detect the voltage of the neutral line and the power line, it can be connected to any wiring.

[0038] The switch CW has a connection terminal Tb, a first output terminal Tn1, a second output terminal Tn2, a third output terminal Tn3, and a disconnection terminal Tn0, wherein the connection terminal Tb is connected to the AC wiring. The first output terminal Tn1 is connected to the first input terminal C1. The second output terminal Tn2 is connected to the second input terminal C2. The third output terminal Tn3 is connected to the third input terminal C3.

[0039] In the switching switch CW, the connection terminal Tb is electrically connected to any one of the first output terminal Tn1, the second output terminal Tn2, and the third output terminal Tn3. For example, in the switching switch CW, when the first button switch Bt1 is pressed, the connection terminal Tb is connected to the first output terminal Tn1. When the second button switch Bt2 is pressed, the connection terminal Tb is connected to the second output terminal Tn2. When the third button switch Bt3 is pressed, the connection terminal Tb is connected to the third output terminal Tn3.

[0040] When the cut-off button switch Bt0 is pressed, the connection terminal Tb is connected to the cut-off terminal Tn0. However, the present invention is not limited thereto, and when the cut-off button switch Bt0 is pressed, the connection terminal Tb is separated from each output terminal. Other structures are also possible.

[0041] In summary, the switch CW supplies the AC voltage Vac to the first input terminal C1 when the first push button switch Bt1 is pressed, supplies the AC voltage Vac to the second input terminal C2 when the second push button switch Bt2 is pressed, and supplies the AC voltage Vac to the third input terminal C3 when the third push button switch Bt3 is pressed.

[0042] The changeover switch CW can utilize the same circuit as the circuit of a switch that uses a choke coil to change the speed of the AC motor. Therefore, the details of the circuit of the changeover switch CW are omitted.

[0043] <2.2 First power supply circuit 10>

[0044] like Figure 2 As shown, the power supply device 100 has a power wiring L1 connected to the power supply terminal CA. The power wiring L1 is a wiring for supplying AC power, and has two wirings. The power wiring L1 connects the power supply terminal CA and the first power supply circuit 10. The first power supply circuit 10 is supplied with an AC voltage.

[0045] The first power supply circuit 10 is a circuit for generating a driving voltage Vdc from an AC voltage Vac. The first power supply circuit 10 includes, for example, a diode bridge and a so-called full-wave rectifier circuit. That is, the first power supply circuit 10 generates a DC driving voltage Vdc required to drive the load M from the AC voltage Vac supplied from the power supply terminal CA. In addition, the first power supply circuit 10 includes a full-wave rectifier circuit. In addition, the driving voltage Vdc is a voltage required to drive the motor M, and is a voltage higher than the operating voltage Vcc1 and the control voltage Vcc2 described later, but is not limited thereto.

[0046] <2.3 Second power supply circuit 20>

[0047] Figure 2 The second power supply circuit 20 shown in FIG. 1 is a circuit for providing an operating voltage Vcc1 from an input AC voltage. Figure 2 As shown, the second power supply circuit 20 is connected to the first input terminal C1, the second input terminal C2 and the third input terminal C3. Figure 2 In the power supply device 100 shown, the wiring from the first input terminal C1, the second input terminal C2, and the third input terminal C3 are connected to the second power supply circuit 20 individually, but the present invention is not limited to this. The wiring from all terminals may be temporarily connected to one terminal of the second power supply circuit 20 in a centralized manner.

[0048] The second power supply circuit 20 receives the AC voltage Vac supplied to any input terminal of the first input terminal C1, the second input terminal C2, and the third input terminal C3. In the following description, the AC voltage Vac received from the first input terminal C1, the second input terminal C2, and the third input terminal C3 may be referred to as the first input voltage Vac1, the second input voltage Vac2, and the third input voltage Vac3, respectively, as required. The first input voltage Vac1, the second input voltage Vac2, and the third input voltage Vac3 are the same voltage.

[0049] The second power supply circuit 20 includes a half-wave rectifier circuit 21 and a DC-DC converter circuit 22 connected to the rear stage of the half-wave rectifier circuit 21. The half-wave rectifier circuit 21 is a conventionally known circuit using, for example, a diode and a capacitor. The half-wave rectifier circuit 21 rectifies only a half-wave of the AC voltage Vac input from any of the first input terminal C1, the second input terminal C2, and the third input terminal C3 to generate a DC voltage.

[0050] The DC-DC conversion circuit 22 converts the voltage generated by the half-wave rectifier circuit 21 to generate a DC operating voltage Vcc1. In addition, the DC-DC conversion circuit 22 is a well-known circuit in the art, and a detailed description is omitted. That is, the second power supply circuit 20 converts the AC voltages Vac1, Vac2, and Vac3 input from the input terminals C1, C2, and C3 into DC, and then generates a DC operating voltage Vcc1.

[0051] The operating voltage Vcc1 is a voltage capable of driving the control circuit 30 and the drive circuit 60. The power consumption of the control circuit 30 and the drive circuit 60 is lower than the power consumption of the motor M. Therefore, in the second power supply circuit 20 that generates the operating voltage Vcc1, a half-wave rectifier circuit having a small power after rectification can be adopted, and the circuit structure of the second power supply circuit 20 can be simplified. That is, the structure of the power supply device 100 can be simplified.

[0052] In addition, if Figure 2 As shown, the driving voltage Vdc generated by the first power supply circuit 10 is also input to the second power supply circuit 20. The driving voltage Vdc biases the AC voltage Vac in the second power supply circuit 20. After starting to generate the driving voltage Vdc, the second power supply circuit 20 rectifies the AC voltage Vac biased by the driving voltage Vdc to generate the operating voltage Vcc1.

[0053] That is, the second power supply circuit 20 generates the operating voltage Vcc1 by using the driving voltage Vdc when the driving voltage Vdc is supplied. Since the AC voltage Vac is biased by the driving voltage Vdc, a stable operating voltage Vcc1 can be output compared to the case where only the AC voltage Vac is used. In addition, when the operating voltage Vcc1 is output to the second power supply circuit 20, the supply of the AC voltage from each input terminal C1, C2, and C3 to the second power supply circuit 20 can also be cut off.

[0054] <2.4 Signal Generation Circuits 41, 42, 43>

[0055] The first input terminal C1, the second input terminal C2, and the third input terminal C3 are connected to the first signal generating circuit 41, the second signal generating circuit 42, and the third signal generating circuit 43, respectively. Figure 2 As shown, the first signal generation circuit 41 , the second signal generation circuit 42 , and the third signal generation circuit 43 are connected in parallel to the second power supply circuit 20 when viewed from the first input terminal C1 , the second input terminal C2 , and the third input terminal C3 .

[0056] That is, the first input voltage Vac1 as an AC voltage is input to the first signal generating circuit 41. The first signal generating circuit 41 outputs the first control signal SgL according to the first input voltage Vac1. The second signal generating circuit 42 outputs the second control signal SgM according to the second input voltage Vac2. The third signal generating circuit 43 outputs the third control signal SgH according to the third input voltage Vac3. That is, the control signals SgL, SgM, and SgH are output according to the AC voltages Vac1, Vac2, and Vac3 input from the input terminals C1, C2, and C3.

[0057] The details of the signal generating circuit are described with reference to the accompanying drawings. The first signal generating circuit 41, the second signal generating circuit 42, and the third signal generating circuit 43 are identical circuits except for a part. Therefore, in the following description, the three signal generating circuits are represented and described with reference to the first signal generating circuit 41. Figure 4 This is a wiring diagram of an example of the first signal generating circuit 41.

[0058] like Figure 4 As shown, the first signal generating circuit 41 includes a first voltage dividing circuit 411, a second voltage dividing circuit 412, a capacitor C41, a Zener diode ZD41, and a first transistor Q41. The first voltage dividing circuit 411 connects the first input terminal C1 and the frame grounding point Grs. In addition, the frame grounding point Grs is the grounding point of the box body and is the reference voltage of the power supply device 100. In addition, the power supply device 100 also has an earth grounding point Grr. The earth grounding point Grr is a grounding point for the power line.

[0059] In the first voltage divider circuit 411, the first resistor R411 and the second resistor R412 are connected in series. The connection point between the first resistor R411 and the second resistor R412 is the output terminal. The first voltage divider circuit 411 obtains the voltage from the first input terminal C1. That is, the signal generation circuit 41 has the first voltage divider circuit 411 connecting the input terminal C1 and the ground point Grs.

[0060] The capacitor C41 connects the output terminal of the first voltage divider circuit 411 and the frame ground point Grs. In addition, the Zener diode ZD41 is connected in parallel with the capacitor C41. The anode side of the Zener diode ZD41 is connected to the frame ground point Grs. The output terminal of the first voltage divider circuit 411 is connected to the cathode side of the Zener diode ZD41 and is connected to the base of the first transistor Q41.

[0061] A DC voltage is generated by the capacitor C41 and the Zener diode ZD41. That is, the first signal generating circuit 41 generates a DC voltage based on the first AC input voltage Vac1 and inputs it to the base of the first transistor Q41.

[0062] In addition, in the present embodiment, a fourth resistor R414 is provided on the wiring connecting the capacitor C41 and the first voltage divider circuit 411. In addition, a fifth resistor R415 is provided on the wiring connecting the capacitor C41 and the cathode side of the Zener diode ZD41. By adjusting the resistance values ​​of the fourth resistor R414 and the fifth resistor R515, even if the first input voltage Vac1 of AC is input to the first signal generating circuit 41, a DC voltage that causes the first transistor Q41 to continue to operate can be applied to the base of the first transistor Q41.

[0063] The control voltage Vcc2 generated by the control circuit 30 and described later is provided to the second voltage divider circuit 412, and the second voltage divider circuit 412 is connected to the frame ground point Grs. That is, the control voltage Vcc2 is provided to the second voltage divider circuit 412, and the second voltage divider circuit 412 is connected to the ground point Grs. In the second voltage divider circuit 412, the discrimination resistor Rx and the third resistor R413 are connected in series. And, the connection point between the discrimination resistor Rx and the third resistor R413 is the output terminal of the second voltage divider circuit 412. The voltage output from the output terminal is the first control signal SgL. The first control signal SgL is input to the control circuit 30.

[0064] The first transistor Q41 is an npn-type bipolar transistor. In addition, the first transistor Q41 is not limited to an npn-type bipolar transistor, and may be, for example, a field effect transistor (FET), a MOSFET (MOS-type FET), an IGBT, etc. In addition, it is not limited to transistors, and a wide range of elements that switch on and off according to the input of a specified signal can be used. In addition, when a transistor such as the base of a bipolar transistor or the gate of a FET is used as a switching element, a terminal that receives an on and off trigger signal is set as a control terminal.

[0065] The first transistor Q41 is connected in series with the second voltage divider circuit. That is, the control voltage Vcc2 is input to the collector of the first transistor Q41. The emitter of the first transistor Q41 is connected to the frame ground point Grs via the second voltage divider circuit 412. The base of the first transistor Q41 is connected to the output terminal of the first voltage divider circuit 411 and the cathode side of the Zener diode ZD41 as described above. That is, the first transistor Q41 is connected in series with the second voltage divider circuit 412, and the cathode side of the Zener diode ZD41 is connected to the control terminal (base).

[0066] In the first transistor Q41, when the base-emitter voltage becomes higher than the threshold value, current flows between the collector and the emitter. That is, when a DC voltage higher than a certain voltage is input from the capacitor C41 and the Zener diode ZD41, the collector and the emitter of the first transistor Q41 are turned on, and the control voltage Vcc2 is provided to the second voltage divider circuit 412. That is, the first transistor Q41 can provide the control voltage Vcc2 to the second voltage divider circuit 412 according to the voltage provided from the cathode side of the Zener diode ZD41.

[0067] The first signal generating circuit 41 outputs the output of the second voltage dividing circuit 412 as the control signal SgL to the control circuit 30. That is, the signal generating circuit can obtain the DC first control signal SgL from the AC first input voltage Vac1 with a simple configuration.

[0068] The first signal generating circuit 41 outputs the control signal SgL when the control voltage Vcc2 is supplied. That is, the signal generating circuit 41 outputs the control signal SgL when the control voltage Vcc2 is supplied. It is possible to suppress the control signal SgC from being supplied from the signal generating circuits 41, 42, and 43 to the switch circuit 50 before the control circuit 30 completes the startup operation. Thus, the drive voltage Vdc can be outputted when the control circuit 30 completes the startup and the drive circuit 60 is controlled, and the motor M can be rotated safely and reliably.

[0069] In addition, if there is a circuit (for example, a delay circuit, a masking circuit, etc.) that causes the signal generation circuit to output the control signal SgC when the drive circuit 60 is controlled by the control circuit 30, the configuration is not limited to the above configuration. For example, in the case of the above circuit, the operating voltage Vcc1 may be provided to the signal generation circuit instead of the control voltage Vcc2. In this case, the circuit that generates the control voltage Vcc2 may be omitted from the control circuit 30.

[0070] The output of the voltage divider circuit changes according to the resistance value of the resistor connected in series. In the power supply device 100, the first signal generating circuit 41, the second signal generating circuit 42, and the third signal generating circuit 43 each have a discrimination resistor Rx having a different resistance value. The first signal generating circuit 41, the second signal generating circuit 42, and the third signal generating circuit 43 have the same structure except for the discrimination resistor Rx. Thus, the first control signal SgL, the second control signal SgM, and the third control signal SgH having different voltages are output from the first signal generating circuit 41, the second signal generating circuit 42, and the third signal generating circuit 43, respectively.

[0071] That is, a plurality of signal generating circuits are arranged in accordance with the plurality of input terminals C1, C2, C3. Each of the signal generating circuits 41, 42, 43 outputs a control signal SgL, SgM, SgH having a different characteristic (here, voltage) in accordance with the input terminal C1, C2, C3 connected thereto.

[0072] The control signals SgL, SgM, and SgH outputted from the signal generating circuits 41 , 42 , and 43 have different voltages, and the control circuit 30 can easily distinguish the control signals SgL, SgM, and SgH.

[0073] The signal generation circuit described above is an example and is not limited thereto. A wide range of circuits can be used that can be connected in parallel with the second power supply circuit 20 when viewed from the input terminal and can obtain a control signal from an input voltage.

[0074] <2.5 Switching Circuit 50>

[0075] like Figure 2 As shown, the switch circuit 50 is disposed in one of the two wirings included in the power wiring L1. The power wiring L1 is connected or disconnected by switching the switch circuit 50. The power supply to the first power supply circuit 10 is controlled by the switch circuit 50. The details of the switch circuit 50 will be described with reference to the new drawings. Figure 5 1 is a wiring diagram of an example of the switch circuit 50 .

[0076] like Figure 5As shown, the switch circuit 50 includes a relay 51, a second transistor Q51, a base resistor R51, and a base-emitter resistor R52. The relay 51 is an example of a first switch element. The relay 51 includes a switch unit 511, a coil 512, a first terminal 513, a second terminal 514, a third terminal 515, and a fourth terminal 516.

[0077] like Figure 5 As shown, the switch 511 is a switch for switching the wiring on and off. At least a portion of the switch 511 contains a magnetic material, and the switch 511 is attracted by the excitation of the coil 512 and becomes a closed state. One side of the switch 511 is connected to the first terminal 513, and the other side is connected to the third terminal 515. That is, when the switch 511 is closed, the first terminal 513 and the third terminal 515 are closed, and the first terminal 513 and the third terminal 515 are connected.

[0078] The coil 512 is an electromagnetic coil, and is excited by the flow of current. As described above, the coil 512 is excited, and the switch 511 is closed. The coil 512 is connected to the second terminal 514 and the fourth terminal 516.

[0079] In the relay 51, the first terminal 513 and the third terminal 515 are connected to the power wiring L1. That is, the switch circuit 50 includes the first switch element 51 arranged on the wiring L1 connecting the power supply terminal CA and the first power supply circuit 10. When the switch 511 is in the open state, the power wiring L1 is in the open state, and the AC voltage Vac is not supplied to the first power supply circuit 10. When the switch 511 is in the closed state, the power wiring L1 is in the closed state, and the AC voltage Vac is supplied to the first power supply circuit 10.

[0080] The operating voltage Vcc1 is supplied to the second terminal 514. In addition, the fourth terminal 516 is connected to the collector of the second transistor Q51.

[0081] The second transistor Q51 is an npn bipolar transistor. In addition, the second transistor Q51 may also use an element other than a bipolar transistor, similarly to the first transistor Q41. As described above, the collector of the second transistor Q51 is connected to the fourth terminal 516 of the relay 51. The emitter of the second transistor Q51 is connected to the frame ground point Grs. As a result, the reference potential of the switch circuit 50 is consistent with the reference potential of the signal generating circuits 41, 42, and 43.

[0082] A control signal SgC is input to the second transistor Q51. The control signal SgC is any one of the first control signal SgL, the second control signal SgM, and the third control signal SgH. Figure 2As shown in FIG. 1 , in the power supply device 100, the output of the first signal generating circuit 41, the output of the second signal generating circuit 42, and the output of the third signal generating circuit 43 are all input to the switch circuit 50. Figure 5 As shown, these signals are input to the base of the second transistor Q51. That is, in the power supply device 100, when an input voltage is supplied to any of the first input terminal C1, the second input terminal C2, and the third input terminal C3, the control signal SgC is input to the second transistor Q51.

[0083] The second transistor Q51 is connected to a base resistor R51 and a base-emitter resistor R52. The base resistor R51 and the base-emitter resistor R52 are resistors for protecting the second transistor Q51 and stabilizing the operation, and are well-known technologies. Therefore, the details of these resistors are omitted.

[0084] When the control signal SgC is input to the base of the second transistor Q51, current flows between the collector and emitter of the second transistor Q51. That is, the operating voltage Vcc1 is provided to the coil 512. As a result, current flows in the coil 512, and the coil 512 is excited. By the excitation of the coil 512, the switch 511 is closed, the power wiring L1 becomes a closed state, and the AC voltage Vac is provided to the first power supply circuit 10. That is, in the switch circuit 50, the relay 51 that receives the operating voltage Vcc1 and operates is a switching element. By using the relay 51, the supply of the AC voltage to the first power supply circuit 10 can be limited by a simple structure.

[0085] That is, the switch circuit 50 and the signal generating circuit 41 are grounded to the ground point Grs of the same potential, and the first switch element 51 is turned on during the period of receiving the control signal SgC. To explain in more detail, the switch circuit 50 includes a second transistor Q51, which is arranged between the relay 51 and the ground point Grs, and makes the relay 51 and the ground point Grs into a conducting state or a non-conducting state according to the input of the control signal SgC. Thus, the relay 51 can be driven according to the control signal SgC with a simple structure.

[0086] <2.6 Control circuit 30>

[0087] The control circuit 30 includes a processing circuit that determines the rotation speed, operation time, etc. of the motor M. The control circuit 30 includes, for example, a computing device such as a CPU and an MPU. The control circuit 30 receives inputs of a first control signal SgL output from the first signal generating circuit 41, a second control signal SgM output from the second signal generating circuit 42, and a third control signal SgH output from the third signal generating circuit 43.

[0088] The first control signal SgL, the second control signal SgM, and the third control signal SgH have different voltages from each other. Therefore, the control circuit 30 includes a discrimination circuit (not shown) that can discriminate signals of different voltages from each other. That is, the control circuit 30 includes a discrimination circuit that can discriminate a signal based on the characteristics of an input signal. In addition, the characteristics discriminated by the discrimination circuit are not limited to voltage.

[0089] Sometimes, the first control signal SgL, the second control signal SgM, and the third control signal SgH are signals having different characteristics other than voltage (e.g., frequency). The discrimination circuit may be a circuit capable of discriminating the difference in these characteristics. In other words, the discrimination circuit can discriminate the characteristics of the signal to discriminate the input signal. Figure 2 In the embodiment, the first control signal SgL, the second control signal SgM and the third control signal SgH are independently input to the control circuit 30, but in practice they only need to be connected to one terminal (the terminal connected to the determination circuit).

[0090] In addition, the first control signal SgL, the second control signal SgM and the third control signal SgH may also be digital signals. Figure 2 As shown, each signal is inputted independently, and the inputted control signal can be identified. In addition, in addition to these, a wide range of methods for identifying the control signal can be adopted.

[0091] The operating voltage Vcc1 is supplied to the control circuit 30. The control circuit 30 is driven by the operating voltage Vcc1. The control circuit 30 generates a control voltage Vcc2 from the operating voltage Vcc1. Furthermore, the control circuit 30 supplies the control voltage Vcc2 to the first signal generating circuit 41, the second signal generating circuit 42, and the third signal generating circuit 43. In addition, the control voltage Vcc2 is a direct current, but is not limited thereto.

[0092] That is, the control circuit 30 generates a DC control voltage Vcc2 from the operating voltage Vcc1. In this way, it is possible to suppress the control signal SgC from being provided to the switch circuit 50 from the signal generating circuits 41, 42, and 43 before the control circuit 30 completes the startup operation. As a result, the drive voltage Vdc can be output after the control circuit 30 completes the startup. As a result, the motor M can be rotated safely and reliably.

[0093] As described above, when Bt1 corresponding to weakness (slow rotation) is pressed, the first signal generating circuit 41 outputs the first control signal SgL. Therefore, the first control signal SgL is a signal indicating the low-speed rotation of the motor M. In addition, when Bt2 corresponding to medium (medium-speed rotation) is pressed, the second signal generating circuit 42 outputs the second control signal SgM. Therefore, the second control signal SgM is a signal indicating the medium-speed rotation of the motor M. In addition, when Bt3 corresponding to strength (high-speed rotation) is pressed, the third signal generating circuit 43 outputs the third control signal SgH. Therefore, the third control signal SgH is a signal indicating the high-speed rotation of the motor M.

[0094] When any of the first control signal SgL, the second control signal SgM, and the third control signal SgH is input to the control circuit 30, the type of the input signal is discriminated by the discrimination circuit. Then, the control circuit 30 outputs a drive signal SgD to the drive circuit 60, and the drive signal SgD includes an instruction to rotate the motor M at a speed corresponding to the discriminated signal. For example, when the first control signal SgL is received, the drive signal SgD that rotates the motor M at a low speed is output to the drive circuit 60. The same is true when the second control signal SgM and the third control signal SgH are received. That is, the control circuit 30 operates through the action voltage Vcc1 and generates the control voltage Vcc2, and controls the drive circuit 60 according to the control signals SgL, SgM, and SgH.

[0095] <2.7 Driving Circuit 60>

[0096] The drive circuit 60 is connected to the motor M. The drive circuit 60 receives the drive voltage Vdc from the first power circuit 10 and the operating voltage Vcc1 from the second power circuit 20 . The drive circuit 60 is driven by the operating voltage Vcc1 . The drive signal SgD is input from the control circuit 30 to the drive circuit 60 .

[0097] The motor M connected to the drive circuit 60 is a brushless DC motor. For example, the motor M rotates by being supplied with three voltages of different phases at appropriate timing. Therefore, the drive circuit 60 generates voltages of different phases from the drive voltage and supplies them to the motor M. That is, the drive circuit 60 supplies the drive voltage Vdc to the load M. The drive circuit 60 is a so-called inverter.

[0098] The power supply device 100 of the present embodiment has the above-described structure.

[0099] <3. Operation of the power supply device 100 >

[0100] Next, the operation of the power supply device 100 will be described. Figure 61 is a timing chart showing the operation of the power supply device 100 after the first push button switch Bt1 is pressed. Figure 6 The timing diagram shown is a schematic diagram showing a conceptual operation. Therefore, it may be different from the actual operation of the power supply device 100. Figure 6 The timing diagram shows the action of the air supply device Fn in the stopped state when the first button switch Bt1 is pressed. Therefore, in the timing diagram, only the parts related to the action of the first button switch Bt1, namely, the first output terminal Tn1, the first input voltage Vac1, and the first control signal SgL are recorded, and the description of other button switches, input voltages, and control signals is omitted.

[0101] The AC voltage Vac is supplied to the first power supply circuit 10 only when the switch circuit 50 (relay 51) is turned on. In the following description, in order to distinguish it from the AC voltage Vac supplied via the power supply terminal CA, the AC voltage supplied to the first power supply circuit 10 when the switch circuit 50 is turned on is referred to as the power supply input voltage Vac0. In addition, although there is a cutoff based on the switch circuit 50, other than this, the power supply input voltage Vac0 is the same as the AC voltage Vac.

[0102] Figure 6 The horizontal axis of the timing diagram shown is time. Figure 6 In the timing diagram shown, the AC voltage Vac, the power input voltage Vac0, the first input voltage Vac1, the first output terminal Tn1, the operating voltage Vcc1, the control voltage Vcc2, the control signal SgL (SgC), the drive signal SgD, the switch 511, and the drive voltage Vdc are arranged from the top. In addition, for the first output terminal Tn1 and the switch 511, the L state represents the open state, and the H state represents the closed state. In addition, for the control signal SgL (SgC) and the drive signal SgD, the state of the output signal is represented as the H state.

[0103] like Figure 6 As shown, the AC voltage Vac is supplied to the power supply device 100. When the first push button switch Bt1 is pressed at time t11, the connection terminal Tb of the changeover switch CW is connected to the first output terminal Tn1. Thus, at time t11, the first input voltage Vac1 is input from the first input terminal C1.

[0104] The first input voltage Vac1 input from the first input terminal C1 is input to the second power supply circuit 20 and the first signal generating circuit 41. Figure 6As shown, at time t11, the control voltage Vcc2 is not generated. Therefore, the first signal generating circuit 41 is stopped, and even if the first input voltage Vac1 is input, the first signal generating circuit 41 does not operate. On the other hand, the first input voltage Vac1 is input to the half-wave rectifier circuit 21 of the second power supply circuit 20. Thus, the alternating first input voltage Vac1 is half-wave rectified. And, the direct current converted into a predetermined voltage by the DC-DC conversion circuit 22 is output as the operating voltage Vcc1 at time t12. In addition, the time from time t11 to time t12 can be changed according to the circuit structure of the second power supply circuit 20, but when the first input voltage Vac1 is not input, the operating voltage Vcc1 is not output.

[0105] As described above, the operating voltage Vcc1 is supplied to the control circuit 30, the switch circuit 50 and the drive circuit 60. That is, at time t12, the control circuit 30 and the drive circuit 60 start to operate. The switch circuit 50 is in a state where it can operate when the operating voltage Vcc1 is input, that is, in a standby state.

[0106] Furthermore, the control circuit 30 generates a control voltage Vcc2 based on the input operation voltage Vcc1. The control circuit 30 outputs the control voltage Vcc2 at time t13. The control voltage Vcc2 is provided to the first signal generation circuit 41, the second signal generation circuit 42, and the third signal generation circuit 43. That is, at time t13, the first signal generation circuit 41, the second signal generation circuit 42, and the third signal generation circuit 43 are in a state of starting to operate or being able to operate. In addition, the time from time t12 to time t13 can be changed according to the circuit structure of the control circuit 30, but when the operation voltage Vcc1 is not input to the control circuit 30, the control voltage Vcc2 is not output.

[0107] At time t13, the first input voltage Vac1 is input from the first input terminal C1 to the first signal generating circuit 41. Therefore, in the first signal generating circuit 41, the operation starts from time t13. And, the first signal generating circuit 41 outputs the first control signal SgL at time t14. In addition, the first control signal SgL is output to the switch circuit 50 as the control signal SgC. In addition, the time from time t13 to time t14 can be changed according to the circuit structure of the first signal generating circuit 41, but when the control voltage Vcc2 is not input to the first signal generating circuit 41, the control signal SgL is not output.

[0108] In the switch circuit 50, the control signal SgC starts to operate from time t14. In addition, in the switch circuit 50, after the control signal SgC is input, that is, at time t15, the relay 51 operates and the switch 511 is closed. As a result, the power input voltage Vac0 is input to the first power circuit 10. As a result, the first power circuit 10 starts to drive and outputs the drive voltage Vdc. In addition, the time from time t14 to time t15 can be changed according to the circuit structure of the switch circuit 50, but when the control signal SgC is not input to the switch circuit 50, the power input voltage Vac0 is not input to the first power circuit 10.

[0109] Then, after the drive voltage Vdc is input to the drive circuit 60, at time t16, the drive signal SgD is output from the control circuit 30 to the drive circuit 60. The drive circuit 60 supplies the drive voltage to the motor M in accordance with the input of the drive signal SgD. That is, in the power supply device 100, power is supplied to the motor M at time t16, and the motor M starts to rotate. In addition, the time from time t15 to time t16 can be changed according to the circuit structure of the control circuit 30, but the control voltage Vcc2 is not output before the operating voltage Vcc1 is input to the control circuit 30.

[0110] In this way, in the motor device 200 having the power supply device 100, when the first push button switch Bt1 as the action switch is pressed, the drive voltage Vdc for driving the motor M is generated after the control circuit 30 is started up and the drive circuit 60 is controlled by the control circuit 30. Therefore, erroneous operation of the motor M can be suppressed.

[0111] In the above description, the case where the first button switch Bt1 is pressed is described, but the same operation is performed when the second button switch Bt2 is pressed, and the motor M rotates at a faster speed than when the first button switch Bt1 is pressed. In addition, the same operation is performed when the third button switch Bt3 is pressed, and the motor M rotates at a faster speed than when the second button switch Bt2 is pressed.

[0112] Next, the operation of the power supply device 100 when the motor M in the operating state is stopped will be described. Figure 7 2 is a timing chart showing the operation of the power supply device 100 when the motor M is stopped.

[0113] like Figure 7 As shown, when the motor M rotates, the driving voltage Vdc is supplied from the first power supply circuit 10 to the driving circuit 60 , and the driving signal SgD is output from the control circuit 30 to the driving circuit 60 .

[0114] In this state, when the cut-off button switch Bt0 is pressed at time t21, the connection between the connection terminal Tb and the first output terminal Tn1 is cut off. As a result, the first input voltage Vac1 is cut off. And, after a certain period of time, the output of the first control signal SgL from the first signal generating circuit 41 stops (time t22). In addition, the time from time t21 to time t22 depends on the circuit structure of the first signal generating circuit 41. In addition, when the first control signal SgL stops, power is not supplied to the relay 51, and the switch 511 is opened. As a result, the power input voltage Vac0 supplied to the first power supply circuit 10 is no longer supplied, and the output of the drive voltage Vdc stops.

[0115] In the power supply device 100, the second power supply circuit 20 and the control circuit 30 are configured to safely stop the operation of the motor M. Therefore, after the supply of the first input voltage Vac1 stops, the second power supply circuit 20 and the control circuit 30 stop outputting the drive signal SgD (time t23), stop outputting the control voltage Vcc2 (time t24), and then stop outputting the operating voltage Vcc1 (time t25). In addition, in the power supply device 100, the circuit configuration of the second power supply circuit 20 and the control circuit 30 that can perform the above operations is provided.

[0116] In the above description, the state where the first push button switch Bt1 is pressed is described, but the same operation is performed when the second push button switch Bt2 is pressed, and the motor M stops. In addition, the same operation is performed when the third push button switch Bt3 is pressed, and the motor M stops.

[0117] As described above, when the motor M is started, the power supply device 100 can drive the control circuit 30 and the drive circuit 60 in advance before the drive voltage Vdc for driving the motor M is output. Thus, it is possible to limit the supply of the drive voltage Vdc to the drive circuit 60 before the control circuit 30 and the drive circuit 60 complete the starting operation, and it is possible to limit the erroneous operation of the motor M due to the supply of the drive voltage Vdc in the middle of the starting operation.

[0118] In addition, in the power supply device 100 of such a structure, by pressing the first button switch Bt1, the second button switch Bt2, and the third button switch Bt3, the motor M can be safely driven at the rotation speed set for each button. Thus, the DC motor M can be operated in the same operation steps as the switch using the existing AC motor. Thus, the convenience of the user can be improved. In addition, since the DC motor with less power consumption than the AC motor is driven, the power consumption can be recommended.

[0119] In addition, the motor device of the present invention can be used not only in the air supply device, but also can be widely used as a power source for rotating a rotating body. In addition, the power supply device of the present invention can be used as a power supply circuit of the following electrical equipment: the electrical equipment is a DC load and is provided with AC power. In addition, the load to which the power supply device provides power is not limited to the motor. It can be any electrical equipment driven by DC, such as LED. The drive circuit adopts a structure corresponding to the action of the load.

[0120] Although the embodiments of the present invention have been described above, the present invention is not limited to these contents. In addition, various changes can be made to the embodiments of the present invention without departing from the gist of the invention.

Claims

1. A power supply device that receives an AC voltage from an AC power supply and drives and controls a DC load, wherein: The power supply unit has: A power supply terminal connected to the AC power source; a first power supply circuit for generating a DC driving voltage required to drive the load from an AC voltage supplied from the power supply terminal; A driving circuit, which provides the driving voltage to the load; An input terminal, which can be connected to the AC power source; a second power supply circuit that converts the AC voltage input from the input terminal into a DC voltage and generates a DC operating voltage; a signal generating circuit that outputs a control signal according to the AC voltage input from the input terminal; a control circuit that is activated by the action voltage and generates a control voltage, and controls the drive circuit according to the control signal; as well as a switch circuit including a first switch element arranged on a wiring connecting the power supply terminal and the first power supply circuit, The switch circuit is grounded to a ground point having the same potential as the signal generation circuit, and turns on the first switch element while receiving the control signal.

2. The power supply device according to claim 1, wherein: When the driving voltage is supplied, the second power supply circuit generates the operating voltage using the driving voltage.

3. The power supply device according to claim 1 or 2, wherein: The control circuit generates a DC control voltage from the operating voltage.

4. The power supply device according to claim 1 or 2, wherein: The signal generating circuit is capable of outputting the control signal when the control voltage is supplied thereto.

5. The power supply device according to claim 4, wherein: The signal generating circuit has: a first voltage dividing circuit connected to the input terminal and the ground point; A capacitor connected between the output terminal of the first voltage divider circuit and a ground point; a Zener diode connected in parallel with the capacitor, an anode side of the Zener diode connected to the ground point; a second voltage dividing circuit, which is provided with the control voltage and is connected to the ground point; as well as a first transistor connected in series with the second voltage dividing circuit, wherein the cathode side of the Zener diode is connected to the control terminal of the first transistor, The first transistor can provide the control voltage to the second voltage dividing circuit based on the voltage provided from the cathode side of the Zener diode.

6. The power supply device according to claim 1 or 2, wherein: The first power supply circuit includes a full-wave rectifier circuit. The second power supply circuit includes a half-wave rectifying circuit and a DC-DC converting circuit connected to a subsequent stage of the half-wave rectifying circuit.

7. The power supply device according to claim 1 or 2, wherein: The switching element is a relay that is operated by receiving the operating voltage.

8. The power supply device according to claim 7, wherein: The switch circuit includes a second transistor, The second transistor is disposed between the relay and the ground point, and brings the relay and the ground point into a conducting state or a non-conducting state according to input of the control signal.

9. The power supply device according to claim 1 or 2, wherein: The power supply device has a plurality of input terminals. The signal generating circuit is configured in plurality according to the plurality of input terminals, Each of the signal generating circuits outputs a control signal having a different characteristic depending on the input terminal to which it is connected, The control circuit is capable of determining a characteristic of the control signal.

10. A motor device comprising: The power supply device according to any one of claims 1 to 9; and A DC motor is rotated by the electric power supplied from the power supply device.

11. An air supply device, comprising: The motor device according to claim 10; and An impeller is rotated by the motor device.

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