JP7238606B2 - Power supply, motor and blower - Google Patents

Description

The present invention relates to a power supply device, a motor device, and a blower device.

The power supply device described in WO2017-134824 includes a full-wave rectifier circuit that rectifies AC power to DC power, a power supply circuit that converts the output power of the full-wave rectifier circuit into a constant voltage and outputs it, and a DC power supply to a load. and a drive signal output circuit for starting.

The drive signal output circuit is provided with a switch, and when the user presses the switch, it outputs a drive signal and starts supplying DC power to the load. Also, when the switch is turned off, the supply of DC power to the load is stopped.

WO2017-134824

The power supply device described in WO2017-134824 is provided with a drive signal output circuit on the load side of the full-wave rectifier circuit and the power supply circuit. Therefore, depending on the timing at which the switch is pressed, the DC power supplied to the load may vary and the operation of the load may become unstable.

In addition, the switch is a switch that switches between supply and cutoff of DC power, and 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 switch described above. As a result, user convenience is poor.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a power supply device, a motor device, and a blower device that can improve user convenience.

An exemplary power supply device of the present invention includes a power supply terminal connected to an AC power supply, and a first power supply circuit that generates a DC drive voltage required to drive the load from the AC voltage supplied from the power supply terminal. a drive circuit for supplying the drive voltage to the load; an input terminal arranged in parallel with the power supply terminal and connectable to the AC power supply; a second power supply circuit for generating a DC operating voltage after conversion; a signal generation circuit arranged in parallel with the second power supply circuit for outputting a control signal based on the AC voltage input from the input terminal; a control circuit that operates at the operating voltage, generates a control voltage, and controls the drive circuit based on the control signal; a switch circuit including one switch element, wherein the switch circuit is grounded to a ground point having the same potential as that of the signal generation circuit, and turns on the first switch element while receiving the control signal. do.

According to the exemplary power supply device, power supply device, motor device, and blower device of the present invention, user convenience can be enhanced.

FIG. 1 is a front view showing an example of a blower device according to the present invention. FIG. 2 is a schematic wiring diagram of a motor device provided in the blower device shown in FIG. FIG. 3 is an equivalent circuit of the changeover switch. FIG. 4 is a wiring diagram of an example of the first signal generation circuit. FIG. 5 is a wiring diagram of an example of a switch circuit. FIG. 6 is a timing chart showing the operation of the power supply after pressing the first button switch. FIG. 7 is a timing chart showing the operation of the power supply when stopping the motor.

Exemplary embodiments of the invention are described in detail below with reference to the drawings. In the following description, the direction parallel to the central axis Cx of the motor M is defined as "axial direction". A direction orthogonal to the central axis Cx is defined as a "radial direction". A circumferential direction about the central axis Cx is defined as a “circumferential direction”. Further, up, down, left, and right are defined with reference to the air blower Fn shown in FIG. Note that the directions described above are used for explanation, and do not limit the positional relationship and direction of the blower Fn and the motor M in the state of use.

2, 4, 5, etc. are wiring diagrams. In the wiring diagrams used in the following description, the wiring to which the DC voltage is supplied is indicated by solid lines. Wiring to which AC voltage is supplied is indicated by a thick solid line. In addition, the dashed lines indicate the wiring to which the signal that triggers the operation or stop of the circuit or the like is input.

<1. About blower A>
FIG. 1 is a front view showing an example of a blower Fn according to the present invention. FIG. 2 is a schematic wiring diagram of the motor device 200 provided in the blower device Fn shown in FIG. As shown in FIG. 1, the blower Fn is an electric fan. In addition, in the air blower Fn shown in FIG. 1, the central axis Cx is perpendicular to the plane of the paper.

As shown in FIGS. 1 and 2, the blower Fn has a base BS, a support PL, a motor device 200, and an impeller Im. The motor device 200 has a motor M and a power supply device 100 (see FIG. 2). The motor M is driven with a DC voltage. The motor M is, for example, a brushless DC motor, but is not limited to this. A motor driven by DC power can be widely used. The motor M has a shaft (not shown) that is rotated around the central axis Cx by power supply from the power supply device 100 .

The base BS is the base of the blower Fn. The base BS is, for example, rectangular parallelepiped or columnar. The base BS has a space inside and accommodates the power supply device 100 of the motor device 200 . The post PL extends upward from the upper surface of the base BS. A motor M is attached to the upper end of the support PL. Like the base BS, the support PL also has a space inside. 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 pillar PL.

The impeller Im is fixed to the shaft of the motor M and rotated around the central axis by the rotation of the shaft. The impeller Im has an impeller cup Im1 and vanes Im2. The impeller cup Im1 has a lidded cylindrical shape with a lid extending in a direction orthogonal to the central axis Cx, and has a cylindrical portion axially extending from the radial outer edge of the lid. The impeller Im has three blades Im2 arranged at regular intervals in the circumferential direction. Note that the number of blades Im2 is not limited to three. Also, the blades Im2 may not be arranged at regular intervals.

The vanes Im2 extend radially outward from the radial outer edge of the impeller cup Im1. Both axial ends of the blade Im2 are displaced in the circumferential direction. Therefore, the rotation of the impeller Im generates airflow along the axial direction.

A changeover switch CW is provided on the base BS. The change-over switch CW is provided with four button switches Bt0, Bt1, Bt2 and Bt3 projecting from the upper surface of the base BS. Button switches Bt0, Bt1, Bt2 and Bt3 are switches that are pressed by the user.

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

Button switches Bt1, Bt2, and Bt3 are used, for example, to turn on the blower Fn and adjust the air volume, that is, adjust the rotation speed of the motor M. FIG. In addition, in the blower device of the present embodiment, the motor M operates weakly (low speed rotation) by pressing the button switch Bt1. By pressing the button switch Bt2, the motor M operates at medium (medium speed rotation). Furthermore, by pressing the button switch Bt3, the motor M operates strongly (high-speed rotation).

The button switch Bt0 is a switch that returns to its original state after being operated. If there is a button switch whose operating state is maintained, the operating state of that button switch is released. In the following description, the button switch Bt0 may be referred to as the OFF button switch Bt0.

Also, the base BS is provided with a cable Cb having a connector Ct at its tip. The connector Ct is connected to, for example, an outlet (not shown) provided on the wall surface of the living room, and is connected to an AC power line. That is, the AC voltage Vac is supplied to the air blower Fn via the connector Ct and the cable Cb. That is, the cable Cb is part of the AC wiring.

<2. Power supply device 100>
Power supply device 100 receives AC voltage Vac to drive brushless DC motor M that operates on DC power. That is, power supply device 100 receives AC voltage Vac from an AC power supply to drive and control DC load M. FIG. As shown in FIG. 2, 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 generation circuit 41, a second signal generation circuit 42, and a third signal generation circuit 41. It has a generation circuit 43 , a switch circuit 50 and a drive circuit 60 . The power supply device 100 also has a power supply terminal CA, a first input terminal C1, a second input terminal C2, and a third input terminal C3.

<2.1 Terminals CA, C1, C2, C3>
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 supply. The power supply device 100 also has a plurality of input terminals C1, C2, C3. As shown in FIG. 2, power supply terminal CA is connected to cable Cb and receives alternating voltage Vac from cable Cb. That is, in this embodiment, the AC power supply is an AC power line connected via the cable Cb and the connector Ct. However, it is not limited to this, and a configuration that can supply AC power can be widely adopted.

The first input terminal C1, the second input terminal C2 and the third input terminal C3 are connectable to an AC power supply. The first input terminal C1, the second input terminal C2 and the third input terminal C3 are connected to the changeover switch CW.

Here, the change-over switch CW will be described in detail with reference to the drawings. FIG. 3 is an equivalent circuit of the changeover switch CW. As shown in FIGS. 2 and 3, the changeover switch CW is connected to one side of the AC wiring. The changeover switch CW is a switch corresponding to an alternating voltage. AC wiring may have, for example, a neutral wire with a constant voltage (for example, ground voltage) and a power line whose voltage is switched with respect to the neutral wire. In such a case, one of the AC wiring is the power line. As long as the changeover switch CW can always detect the voltages of the neutral line and the power line, it may be connected to either wiring.

The changeover switch CW has a connection terminal Tb to which AC wiring is connected, a first output terminal Tn1, a second output terminal Tn2, a third output terminal Tn3, and a disconnection terminal Tn0. 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.

In the changeover 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 changeover switch CW, when the first button switch Bt1 is pressed, the connection terminal Tb and the first output terminal Tn1 are connected. When the second button switch Bt2 is pressed, the connection terminal Tb and the second output terminal Tn2 are connected. When the third button switch Bt3 is pressed, the connection terminal Tb and the third output terminal Tn3 are connected.

Furthermore, when the off button switch Bt0 is pressed, the connection terminal Tb and the disconnection terminal Tn0 are connected. However, it is not limited to this, and the connection terminal Tb and each output terminal may be separated when the off button switch Bt0 is pressed. Also, other configurations may be used.

As described above, the change-over switch CW supplies the AC voltage Vac to the first input terminal C1 when the first button switch Bt1 is pressed. When the second button switch Bt2 is pressed, the AC voltage Vac is supplied to the second input terminal C2. When the third button switch Bt3 is pressed, the AC voltage Vac is supplied to the third input terminal C3.

The changeover switch CW can use the same circuit as the circuit of the switch that switches the speed of the AC motor using a choke coil. Therefore, details of the circuit of the changeover switch CW are omitted.

<2.2 First Power Supply Circuit 10>
As shown in FIG. 2, the power supply device 100 has a power line L1 connected to a power supply terminal CA. The power wiring L1 is wiring to which AC power is supplied, and has two wirings. The power wiring L1 connects the power supply terminal CA and the first power supply circuit 10 . An AC voltage is supplied to the first power supply circuit 10 .

The first power supply circuit 10 is a circuit that generates a drive voltage Vdc from an AC voltage Vac. The first power supply circuit 10 includes, for example, a so-called full-wave rectifier circuit including a diode bridge. That is, the first power supply circuit 10 generates the DC drive voltage Vdc required to drive the load M from the AC voltage Vac supplied from the power supply terminal CA. Also, the first power supply circuit 10 includes a full-wave rectifier circuit. The drive voltage Vdc is a voltage required to drive the motor M, and is higher than an operating voltage Vcc1 and a control voltage Vcc2, which will be described later, but is not limited to this.

<2.3 Second Power Supply Circuit 20>
The second power supply circuit 20 shown in FIG. 2 is a circuit that supplies an operating voltage Vcc1 from an input AC voltage. As shown in FIG. 2, 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. In the power supply device 100 shown in FIG. 2, the wires from the first input terminal C1, the second input terminal C2, and the third input terminal C3 are individually connected to the second power supply circuit 20, but this is not the only option. not. A configuration may be employed in which wirings from all the terminals are collectively connected to one terminal of the second power supply circuit 20 .

The second power supply circuit 20 receives an AC voltage Vac supplied to any one 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 each of the first input terminal C1, the second input terminal C2, and the third input terminal C3 is changed to the first input voltage Vac1 and the second input voltage Vac1, respectively, as necessary. Vac2 and a third input voltage Vac3 may be used. The first input voltage Vac1, the second input voltage Vac2 and the third input voltage Vac3 are the same voltage.

The second power supply circuit 20 includes a half-wave rectifier circuit 21 and a DC/DC conversion circuit 22 connected after the half-wave rectifier circuit 21 . The half-wave rectifier circuit 21 is, for example, a conventionally known circuit using diodes and capacitors. A half-wave rectifier circuit 21 rectifies only a half-wave of the AC voltage Vac input from any one of the first input terminal C1, the second input terminal C2 and the third input terminal C3 to generate a DC voltage.

DC/DC conversion circuit 22 converts the voltage generated by half-wave rectification circuit 21 to generate DC operating voltage Vcc1. Note that the DC/DC conversion circuit 22 is a conventionally known circuit, and detailed description thereof will be 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 to DC, and then generates the DC operating voltage Vcc1.

The operating voltage Vcc1 is a voltage that can drive the control circuit 30 and the drive circuit 60. FIG. 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 with small power after rectification can be employed, and the circuit configuration of the second power supply circuit 20 can be simplified. That is, the configuration of the power supply device 100 can be simplified.

In addition, as shown in FIG. 2, the drive voltage Vdc generated by the first power supply circuit 10 is also input to the second power supply circuit 20 . In the second power supply circuit 20, the drive voltage Vdc biases the AC voltage Vac. After the drive voltage Vdc starts to be generated, the second power supply circuit 20 rectifies the AC voltage Vac biased by the drive voltage Vdc to generate the operating voltage Vcc1.

That is, the second power supply circuit 20 generates the operating voltage Vcc1 using the drive voltage Vdc when the drive voltage Vdc is supplied. Since the AC voltage Vac is biased by the drive voltage Vdc, it is possible to output a stable operating voltage Vcc1 compared to the case where only the AC voltage Vac is used. When the operating voltage Vcc1 is input to the second power supply circuit 20, the AC voltage supply from the input terminals C1, C2, and C3 to the second power supply circuit 20 may be cut off.

<2.4 Signal Generation Circuits 41, 42, 43>
A first signal generation circuit 41, a second signal generation circuit 42 and a third signal generation circuit 43 are connected to the first input terminal C1, the second input terminal C2 and the third input terminal C3, respectively. As shown in FIG. 2, the first signal generation circuit 41, the second signal generation circuit 42, and the third signal generation circuit 43 are viewed from the first input terminal C1, the second input terminal C2, and the third input terminal C3. It is connected in parallel with the second power supply circuit 20 .

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

Details of the signal generation circuit will be described with reference to the drawings. The first signal generation circuit 41, the second signal generation circuit 42, and the third signal generation circuit 43 are the same circuit except for a part. Therefore, in the following description, the first signal generation circuit 41 will be referred to as a representative of the three signal generation circuits. FIG. 4 is a wiring diagram of an example of the first signal generation circuit 41. As shown in FIG.

As shown in FIG. 4, the first signal generating circuit 41 has 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 ground point Grs. The frame grounding point Grs is the grounding point of the housing and the reference voltage of the power supply device 100 . The power supply device 100 also has a ground point Grr. Earth ground point Grr is the ground point for the power line.

The first voltage dividing circuit 411 connects a first resistor R411 and a second resistor R412 in series. A connection point between the first resistor R411 and the second resistor R412 is an output terminal. The first voltage dividing circuit 411 takes out the voltage from the first input terminal C1. That is, the signal generation circuit 41 has a first voltage dividing circuit 411 that connects the input terminal C1 and the ground point Grs.

A capacitor C41 connects the output terminal of the first voltage dividing circuit 411 and the frame ground point Grs. Zener diode ZD41 is also connected in parallel with capacitor C41. The anode side of Zener diode ZD41 is connected to frame ground point Grs. The output terminal of the first voltage dividing circuit 411 and the cathode side of the Zener diode ZD41 are connected, and are connected to the base of the first transistor Q41.

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 AC first input voltage Vac1, and inputs it to the base of the first transistor Q41.

In this embodiment, the wiring connecting the capacitor C41 and the first voltage dividing circuit 411 has a fourth resistor R414. Also, a fifth resistor R415 is provided in 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 AC first input voltage Vac1 is input to the first signal generating circuit 41, the DC first transistor is connected to the base of the first transistor Q41. A voltage can be applied to keep Q41 operating.

The second voltage dividing circuit 412 is supplied with a later-described control voltage Vcc2 generated by the control circuit 30, and is connected to the frame ground point Grs. That is, the control voltage Vcc2 is supplied to the second voltage dividing circuit 412, and the second voltage dividing circuit 412 is connected to the ground point Grs. In the second voltage dividing circuit 412, a discrimination resistor Rx and a third resistor R413 are connected in series. A connection point between the discrimination resistor Rx and the third resistor R413 is the output terminal of the second voltage dividing 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 .

The first transistor Q41 is an npn bipolar transistor. Note that 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 (MOSFET), an IGBT, or the like. In addition, it is not limited to a transistor, and a wide range of elements that are switched ON/OFF based on the input of a predetermined signal can be employed. When a transistor such as the base of a bipolar transistor or the gate of an FET is used as a switching element, a terminal for receiving an ON/OFF trigger signal is defined as a control terminal.

The first transistor Q41 is connected in series with the second voltage dividing 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 through the second voltage dividing circuit 412 to the frame ground point Grs. As described above, the output terminal of the first voltage dividing circuit 411 and the cathode side of the Zener diode ZD41 are connected to the base of the first transistor Q41. That is, the first transistor Q41 is connected in series with the second voltage dividing circuit 412, and the cathode side of the Zener diode ZD41 is connected to the control terminal (base).

In the first transistor Q41, current flows between the collector and emitter when the voltage between the base and emitter exceeds the threshold. That is, when a DC voltage higher than a certain voltage is input from the capacitor C41 and the Zener diode ZD41, the collector-emitter of the first transistor Q41 becomes conductive, and the control voltage Vcc2 is supplied to the second voltage dividing circuit 412. That is, the first transistor Q41 makes it possible to supply the control voltage Vcc2 to the second voltage dividing circuit 412 based on the voltage supplied from the cathode side of the Zener diode ZD41.

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

The first signal generation circuit 41 outputs the control signal SgL when the control voltage Vcc2 is supplied. That is, the signal generation circuit 41 outputs the control signal SgL when the control voltage Vcc2 is supplied. It is possible to prevent the control signal SgC from being supplied to the switch circuit 50 from the signal generation circuits 41, 42, and 43 before the activation operation of the control circuit 30 is completed. As a result, it is possible to start outputting the driving voltage Vdc in a state where the control circuit 30 is completely activated and the driving circuit 60 is being controlled, and the motor M can be rotated safely and reliably.

Note that the configuration is not limited to that described above as long as a circuit (for example, a delay circuit, a mask circuit, etc.) that outputs the control signal SgC to the signal control circuit is provided while the drive circuit 60 is being controlled by the control circuit 30. . For example, with the circuit described above, the signal control circuit may be supplied with the operating voltage Vcc1 instead of the control voltage Vcc2. In this case, the circuit for generating the control voltage Vcc2 may be omitted from the control circuit 30. FIG.

The output of the voltage dividing circuit changes according to the resistance values of the resistors connected in series. In the power supply device 100, the first signal generation circuit 41, the second signal generation circuit 42, and the third signal generation circuit 43 each have a determination resistor Rx with a different resistance value. The first signal generation circuit 41, the second signal generation circuit 42, and the third signal generation circuit 43 have the same configuration except for the determination resistor Rx. As a result, the first control signal SgL, the second control signal SgM, and the third control signal SgH with different voltages are output from the first signal generation circuit 41, the second signal generation circuit 42, and the third signal generation circuit 43, respectively. be.

That is, a plurality of signal generating circuits are provided for each of the plurality of input terminals C1, C2, C3. The signal generating circuits 41, 42, 43 output control signals SgL, SgM, SgH having different characteristics (here, voltages) for the input terminals C1, C2, C3 connected thereto.

The control signals SgL, SgM, SgH output from the signal generation circuits 41, 42, 43 are different voltages, and the control circuit 30 can easily distinguish between the control signals SgL, SgM, SgH.

It should be noted that the signal generation circuit shown above is an example, and the present invention is not limited to this. As viewed from the input terminal, a circuit that can be connected in parallel with the second power supply circuit 20 and that can extract the control signal from the input voltage can be widely adopted.

<2.5 Switch circuit 50>
As shown in FIG. 2, switch circuit 50 is arranged in one of two lines included in power line L1. By switching the switch circuit 50, the power line L1 is connected or disconnected. The switch circuit 50 controls power supply to the first power supply circuit 10 . Details of the switch circuit 50 will be described with reference to new drawings. FIG. 5 is a wiring diagram of an example of the switch circuit 50. As shown in FIG.

As shown in FIG. 5, the switch circuit 50 has a relay 51, a second transistor Q51, a base resistor R51, and a base-emitter resistor R52. Relay 51 is an example of a first switch element. The relay 51 has an opening/closing portion 511 , a coil 512 , a first terminal 513 , a second terminal 514 , a third terminal 515 and a fourth terminal 516 .

As shown in FIG. 5, the opening/closing unit 511 is a switch that switches between opening and closing of wiring. At least part of the opening/closing portion 511 contains a magnetic material, which is attracted by the excitation of the coil 512 to be closed. One of the opening/closing portions 511 is connected to the first terminal 513 and the other is connected to the third terminal 515 . That is, when the opening/closing portion 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.

The coil 512 is an electromagnetic coil and is excited by applying current. As described above, the opening/closing portion 511 is closed by energizing the coil 512 . Coil 512 is connected to second terminal 514 and fourth terminal 516 .

In relay 51, first terminal 513 and third terminal 515 are connected to power line L1. That is, the switch circuit 50 includes a first switch element 51 arranged on the wiring L1 that connects the power supply terminal CA and the first power supply circuit 10 . When the open/close unit 511 is open, the power line L1 is open and the AC voltage Vac is not supplied to the first power supply circuit 10 . When the open/close unit 511 is closed, the power line L1 is closed and the AC voltage Vac is supplied to the first power supply circuit 10 .

The second terminal 514 is supplied with the operating voltage Vcc1. Also, the fourth terminal 516 is connected to the collector of the second transistor Q51.

The second transistor Q51 is an npn bipolar transistor. Further, elements other than bipolar transistors may be used for the second transistor Q51 as well as the first transistor Q41. The fourth terminal 516 of the relay 51 is connected to the collector of the second transistor Q51 as described above. 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 and the reference potentials of the signal generation circuits 41, 42, and 43 match.

A control signal SgC is input to the second transistor Q51. The control signal SgC is one of the first control signal SgL, the second control signal SgM and the third control signal SgH. As shown in FIG. 2 , in the power supply device 100 , the output of the first signal generation circuit 41 , the output of the second signal generation circuit 42 and the output of the third signal generation circuit 43 are all input to the switch circuit 50 . Then, as shown in FIG. 5, all of these signals are input to the base of the second transistor Q51. In other words, in the power supply device 100, even when the input voltage is supplied to any one of the first input terminal C1, the second input terminal C2 and the third input terminal C3, the second transistor Q51 has a control voltage. A signal SgC is input.

A base resistor R51 and a base-emitter resistor R52 are connected to the second transistor Q51. The base resistor R51 and the base-emitter resistor R52 are resistors for protecting and stabilizing the second transistor Q51, and are known techniques. Therefore, details of these resistors are omitted.

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 supplied to the coil 512 . As a result, a current flows through the coil 512 and is excited. The opening/closing portion 511 is closed by the excitation of the coil 512 , the power wiring L<b>1 is closed, and the AC voltage Vac is supplied to the first power supply circuit 10 . That is, in switch circuit 50, relay 51 that operates upon receiving control voltage Vcc2 is a switch element. By using the relay 51, it is possible to limit the supply of AC voltage to the first power supply circuit 10 with a simple configuration.

That is, the switch circuit 50 is grounded to the ground point Grs having the same potential as that of the signal generation circuit 41, and turns on the first switch element 51 while receiving the control signal SgC. More specifically, the switch circuit 50 includes a second transistor Q51, which is arranged between the relay 51 and the ground point Grs. Grs is made conductive or non-conductive. As a result, the relay 51 can be driven based on the control signal SgC with a simple configuration.

<2.5 Control circuit 30>
The control circuit 30 includes processing circuitry that determines the rotational speed of the motor M, operating time, and the like. The control circuit 30 includes, for example, arithmetic units such as a CPU and an MPU. The control circuit 30 receives the first control signal SgL output from the first signal generation circuit 41, the second control signal SgM output from the second signal generation circuit 42, and the third control signal SgM output from the third signal generation circuit 43. A control signal SgH is input.

The first control signal SgL, the second control signal SgM and the third control signal SgH have different voltages. Therefore, the control circuit 30 includes a discrimination circuit (not shown) that can discriminate signals of different voltages. That is, the control circuit 30 includes a discrimination circuit that can discriminate a signal from the characteristics of the input signal. Note that the characteristic to be determined by the determination circuit is not limited to voltage.

The first control signal SgL, the second control signal SgM, and the third control signal SgH may be signals having different characteristics (for example, frequency) other than voltage. The discrimination circuit may be any circuit that can discriminate between these characteristics. That is, the discrimination circuit can discriminate the characteristics of the signal to discriminate the input signal. In FIG. 2, the first control signal SgL, the second control signal SgM, and the third control signal SgH are each independently input to the control circuit 30, but actually one terminal (a terminal connected to the discrimination circuit) is used. ).

Also, the first control signal SgL, the second control signal SgM and the third control signal SgH may be digital signals. In this case, as shown in FIG. 2, the input control signal can be determined by inputting each signal independently. In addition to these methods, a wide range of methods that can discriminate control signals are employed.

The control circuit 30 is supplied with an operating voltage Vcc1. Control circuit 30 is driven by operating voltage Vcc1. Control circuit 30 generates control voltage Vcc2 from operating voltage Vcc1. The control circuit 30 supplies the control voltage Vcc2 to the first signal generation circuit 41, the second signal generation circuit 42 and the third signal generation circuit 43. FIG. Although the control voltage Vcc2 is direct current, it is not limited to this.

That is, control circuit 30 generates DC control voltage Vcc2 from operating voltage Vcc1. By doing so, it is possible to prevent the control signal SgC from being supplied to the switch circuit 50 from the signal generation circuits 41, 42, and 43 before the startup operation of the control circuit 30 is completed. As a result, it is possible to start outputting the drive voltage Vdc after the control circuit 30 is completely activated. As a result, the motor M can be rotated safely and reliably.

As described above, when Bt1 corresponding to weak (low speed rotation) is pressed, the first signal generation circuit 41 outputs the first control signal SgL. Therefore, the first control signal SgL is a signal that instructs the motor M to rotate at a low speed. Further, when Bt2 corresponding to middle (medium speed rotation) is pressed, the second signal generation circuit 42 outputs the second control signal SgM. Therefore, the second control signal SgM is a signal that instructs the motor M to rotate at medium speed. Further, when Bt3 corresponding to strong (high speed rotation) is pressed, the third signal generation circuit 43 outputs the third control signal SgH. Therefore, the third control signal SgH is a signal that instructs the motor M to rotate at high speed.

When one of the first control signal SgL, the second control signal SgM and the third control signal SgH is input, the control circuit 30 determines the type of the input signal by the determination circuit. Then, the control circuit 30 outputs to the drive circuit 60 a drive signal SgD including an instruction to rotate the motor M at the number of revolutions corresponding to the determined signal. For example, when receiving the first control signal SgL, it outputs to the drive circuit 60 a drive signal SgD for rotating the motor M at a low rotational speed. The same applies when the second control signal SgM and the third control signal SgH are received. That is, the control circuit 30 operates at the operating voltage Vcc1, generates the control voltage Vcc2, and controls the driving circuit 60 based on the control signals SgL, SgM, and SgH.

<2.6 Drive circuit 60>
The drive circuit 60 is connected to the motor M. The drive circuit 60 receives the drive voltage Vdc from the first power supply circuit 10 and the operating voltage Vcc1 from the second power supply circuit 20 . Drive circuit 60 is driven by operating voltage Vcc1. A drive signal SgD is input to the drive circuit 60 from the control circuit 30 .

A motor M connected to the drive circuit 60 is a brushless DC motor. For example, the motor M rotates by supplying three voltages with different phases at appropriate timings. Therefore, the drive circuit 60 generates a voltage having a different phase from the drive voltage and supplies the motor M with the voltage. That is, the drive circuit 60 supplies the load M with the drive voltage Vdc. The drive circuit 60 is a so-called inverter.

The power supply device 100 according to this embodiment has the configuration described above.

<3. Operation of Power Supply Device 100>
The operation of the power supply device 100 will be described below. FIG. 6 is a timing chart showing the operation of the power supply device 100 after pressing the first button switch Bt1. Note that the timing chart shown in FIG. 6 is a schematic diagram and shows a conceptual operation. Therefore, the actual operation of the power supply device 100 may differ. The timing chart of FIG. 6 shows the operation when the first button switch Bt1 of the blower Fn in the stopped state is pressed. Therefore, in the timing chart, only the portions related to the operation of the first button switch Bt1, that is, the first output terminal Tn1, the first input voltage Vac1, and the first control signal SgL are described, and other button switches, input voltages and Description of control signals is omitted.

The AC voltage Vac is supplied to the first power supply circuit 10 only when the switch circuit 50 (relay 51) is ON. In the following description, to distinguish 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 ON is referred to as the power supply input voltage Vac0. Although there is disconnection by the switch circuit 50, other than that, the power input voltage Vac0 and the AC voltage Vac are the same.

In the timing chart shown in FIG. 6, the horizontal axis is time. Further, in the timing chart shown in FIG. 6, from the top, AC voltage Vac, power supply input voltage Vac0, first input voltage Vac1, first output terminal Tn1, operating voltage Vcc1, control voltage Vcc2, control signal SgL (SgC), drive A signal SgD, an opening/closing portion 511 and a driving voltage Vdc are arranged. As for the first output terminal Tn1 and the opening/closing portion 511, the open state is indicated by the L state, and the closed state is indicated by the H state. As for the control signal SgL (SgC) and the drive signal SgD, the state in which the signals are being output is indicated as the H state.

As shown in FIG. 6, the power supply device 100 is supplied with an AC voltage Vac. Then, when the first button switch Bt1 is pressed at time t11, the connection terminal Tb of the changeover switch CW and the first output terminal Tn1 are connected. Accordingly, at time t11, the first input voltage Vac1 is input from the first input terminal C1.

A first input voltage Vac<b>1 input from the first input terminal C<b>1 is input to the second power supply circuit 20 and the first signal generation circuit 41 . As shown in FIG. 6, control voltage Vcc2 is not generated at time t11. Therefore, the first signal generation circuit 41 is stopped, and even if the first input voltage Vac1 is input, the first signal generation 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 . Thereby, the AC first input voltage Vac1 is half-wave rectified. Then, the DC/DC conversion circuit 22 converts the voltage into a DC of a predetermined voltage and outputs it as the operating voltage Vcc1 at time t12. Note that the time from time t11 to time t12 can be changed by the circuit configuration of the second power supply circuit 20, but when the first input voltage Vac1 is not input, the operating voltage Vcc1 is not output.

As described above, operating voltage Vcc1 is supplied to control circuit 30, switch circuit 50 and drive circuit 60. FIG. That is, at time t12, control circuit 30 and drive circuit 60 start operating. Switch circuit 50 enters an operable state, ie, a standby state, when operating voltage Vcc1 is input.

Control circuit 30 then generates control voltage Vcc2 based on input operating voltage Vcc1. Control circuit 30 outputs control voltage Vcc2 at time t13. The control voltage Vcc2 is supplied to the first signal generation circuit 41, the second signal generation circuit 42 and the third signal generation circuit 43. FIG. That is, at time t13, the first signal generation circuit 41, the second signal generation circuit 42, and the third signal generation circuit 43 start operating or become operable. The time from time t12 to time t13 can be changed by the circuit configuration of control circuit 30, but when operating voltage Vcc1 is not input to control circuit 30, control voltage Vcc2 is not output.

At time t13, the first input voltage Vac1 is input to the first signal generating circuit 41 from the first input terminal C1. Therefore, the first signal generating circuit 41 starts operating at time t13. Then, the first signal generation circuit 41 outputs the first control signal SgL at time t14. Also, the first control signal SgL is output to the switch circuit 50 as the control signal SgC. Note that the time from time t13 to time t14 can be changed by the circuit configuration of the first signal generation circuit 41, but when the control voltage Vcc2 is not input to the first signal generation circuit 41, the control signal SgL is not output.

The switch circuit 50 starts operating at time t14 with the control signal SgC. In the switch circuit 50, after the control signal SgC is input, that is, at time t15, the relay 51 operates and the opening/closing portion 511 closes. As a result, the power supply input voltage Vac<b>0 is input to the first power supply circuit 10 . As a result, the first power supply circuit 10 starts driving and outputs the driving voltage Vdc. Note that the time from time t14 to time t15 can be changed by the circuit configuration of the switch circuit 50, but when the control signal SgC is not input to the switch circuit 50, the power supply input voltage Vac0 is not input to the first power supply circuit 10. .

After the driving voltage Vdc is input to the driving circuit 60, the driving signal SgD is output from the control circuit 30 to the driving circuit 60 at time t16. The drive circuit 60 supplies a drive voltage to the motor M according to the input of the drive signal SgD. That is, in the power supply device 100, power supply to the motor M is started at time t16, and the motor M starts rotating. Although the time from time t15 to time t16 can be changed by the circuit configuration of control circuit 30, control voltage Vcc2 is not output until operating voltage Vcc1 is input to control circuit 30. FIG.

As described above, in the motor device 200 including the power supply device 100, when the first button switch Bt1, which is an operation switch, is pressed, the activation of the control circuit 30 is completed, and the drive circuit 60 is controlled by the control circuit 30. After the state is established, a driving voltage Vdc for driving the motor M is generated. Therefore, malfunction of the motor M can be suppressed.

In the above description, the case where the first button switch Bt1 is pressed has been described, but the same operation is performed when the second button switch Bt2 is pressed, and the first button switch Bt1 is pressed. The motor M rotates at a higher speed than the case. Furthermore, when the third button switch Bt3 is pressed, the same operation is performed, and the motor M rotates at a higher speed than when the second button switch Bt2 is pressed.

Next, the operation of the power supply device 100 when stopping the operating motor M will be described. FIG. 7 is a timing chart showing the operation of power supply device 100 when motor M is stopped.

As shown in FIG. 7, when the motor M is rotating, the drive voltage Vdc is supplied from the first power supply circuit 10 to the drive circuit 60, and the drive signal SgD is output from the control circuit 30 to the drive circuit 60. ing.

In this state, when the 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. This disconnects the first input voltage Vac1. Then, the output of the first control signal SgL from the first signal generation circuit 41 stops after a certain period of time has elapsed (time t22). The time from time t21 to time t22 depends on the circuit configuration of the first signal generation circuit 41. FIG. Further, when the first control signal SgL stops, power is no longer supplied to the relay 51 and the opening/closing portion 511 opens. As a result, the power supply input voltage Vac0 supplied to the first power supply circuit 10 is no longer supplied, and the output of the driving voltage Vdc is stopped.

In the power supply device 100, the second power supply circuit 20 and the control circuit 30 are configured to stop the operation of the motor M safely. Therefore, after the supply of the first input voltage Vac1 is stopped, the second power supply circuit 20 and the control circuit 30 stop outputting the drive signal SgD (time t23) and stop outputting the control voltage Vcc2 (time t24). After that, the output of the operating voltage Vcc1 is stopped (time t25). The power supply device 100 has the circuit configurations of the second power supply circuit 20 and the control circuit 30 that are capable of performing the above operations.

In the above description, the state in which the first button switch Bt1 is pressed has been described, but the same operation is performed when the second button switch Bt2 is pressed, and the motor M stops. Furthermore, when the third button switch Bt3 is pressed, the same operation is performed and the motor M stops.

As described above, power supply device 100 can drive control circuit 30 and drive circuit 60 before drive voltage Vdc for driving motor M is output when motor M is started. This restricts the supply of the drive voltage Vdc to the drive circuit 60 before the start-up operations of the control circuit 30 and the drive circuit 60 are completed. malfunction can be suppressed.

In the power supply device 100 having such a configuration, 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. can. As a result, it is possible to operate the DC motor M in the same operation procedure as that of a conventional switch using an AC motor. Thereby, it is possible to improve convenience for the user. Furthermore, since a DC motor, which consumes less power than an AC motor, is driven, power consumption can be reduced.

Moreover, the motor device according to the present invention can be widely used not only as a blower device but also as a power source for rotating a rotating body. Furthermore, the power supply device according to the present invention can be used as a power supply circuit of an electric device to which AC power is supplied as well as a DC load. Also, the load to which the power supply supplies power is not limited to the motor. For example, it may be a DC-driven electric device such as an LED. The drive circuit employs a configuration corresponding to the operation of the load.

Although the embodiment of the present invention has been described above, the present invention is not limited to this content. Various modifications can be made to the embodiments of the present invention without departing from the spirit of the invention.

REFERENCE SIGNS LIST 10 first power supply circuit 20 second power supply circuit 21 half-wave rectifier circuit 22 DC conversion circuit 30 control circuit 41 first signal generation circuit 411 first voltage dividing circuit 412 second voltage dividing circuit 42 second signal generating circuit 43 third signal Generation circuit 50 Switch circuit 51 Relay 511 Switching part 512 Coil 513 First terminal 514 Second terminal 515 Third terminal 516 Fourth terminal 60 Drive circuit 100 Power supply device 200 Motor device A Blower device BS Base Bt Base Bt0 Off button switch Bt1 No. 1 button switch Bt2 2nd button switch Bt3 3rd button switch CW selector switch Cb cable Ct connector CA power supply terminal C1 1st input terminal C2 2nd input terminal C3 3rd input terminal C41 capacitor Fn blower Grr grounding point Grs frame Grounding point Im Impeller Im1 Impeller cup Im2 Blade L1 Power wiring M Motor PL Post 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 First control signal SgM Second control signal Tb Connection terminal Tn0 Disconnection terminal Tn1 First output terminal Tn2 Second output terminal Tn3 Third output terminal Vac First input voltage Vac AC voltage Vac0 Power supply Input voltage Vac1 First input voltage Vac2 Second input voltage Vac3 Third input voltage Vcc1 Operating voltage Vcc2 Control voltage Vdc Drive voltage ZD41 Zener diode

Claims (11)

A power supply device that receives an AC voltage from an AC power supply and drives and controls a DC load,
a power supply terminal connected to the AC power supply;
a first power supply circuit that generates a DC drive voltage required to drive the load from the AC voltage supplied from the power supply terminal;
a drive circuit that supplies the drive voltage to the load;
an input terminal connectable to the AC power supply;
a second power supply circuit that converts an AC voltage input from the input terminal into a DC voltage and then generates a DC operating voltage;
a signal generation circuit that outputs a control signal based on the AC voltage input from the input terminal;
a control circuit that operates at the operating voltage, generates a control voltage, and controls the drive circuit based on the control signal;
a switch circuit including a first switch element arranged in a wiring that connects the power supply terminal and the first power supply circuit;
The power supply device, wherein the switch circuit is grounded to a ground point having the same potential as that of the signal generation circuit, and turns on the first switch element while the control signal is being received. 2. The power supply device according to claim 1, wherein said second power supply circuit generates said operating voltage using said driving voltage when said driving voltage is being supplied. 3. The power supply device according to claim 1, wherein said control circuit generates a DC control voltage from said operating voltage. 4. The declaration device according to claim 1, wherein said signal generation circuit is capable of outputting said control signal when said control voltage is supplied. The signal generation circuit is
a first voltage dividing circuit that connects the input terminal and the ground point;
a capacitor that connects the output terminal of the first voltage dividing circuit and a ground point;
a Zener diode connected in parallel with the capacitor and having an anode side connected to the ground point;
a second voltage dividing circuit supplied with the control voltage and connected to the ground point;
a first transistor connected in series with the second voltage dividing circuit, the cathode side of the Zener diode being connected to a control terminal;
5. The power supply device according to claim 4, wherein said first transistor enables supply of said control voltage to said second voltage dividing circuit based on the voltage supplied from the cathode side of said Zener diode. The first power supply circuit includes a full-wave rectifier circuit,
6. The power supply device according to any one of claims 1 to 5, wherein said second power supply circuit includes a half-wave rectifier circuit and a DC/DC conversion circuit connected downstream of the half-wave rectifier circuit. 7. The power supply device according to claim 1, wherein said switch element is a relay that operates upon receiving said control voltage. The switch circuit includes a second transistor,
8. The power supply device according to claim 7, wherein the second transistor is arranged between the relay and a ground point, and makes the relay and the ground point conductive or non-conductive based on the input of the control signal. . having a plurality of said input terminals;
A plurality of the signal generation circuits are provided for each of the plurality of input terminals,
each of the signal generation circuits outputs a control signal with different characteristics for each input terminal to which it is connected;
9. The power supply device according to any one of claims 1 to 8, wherein said control circuit can determine characteristics of said control signal. a power supply device according to any one of claims 1 to 9;
a DC motor rotated by power supplied from the power supply device. a motor device according to claim 10;
and an impeller rotated by the motor device.

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