JP5889570B2 - DC motor control device, electric solar shading device, and DC motor control method - Google Patents

Description

  The present invention relates to a DC motor control device that controls the operation of a DC motor by a microcomputer, and more particularly to a DC motor control device in an electric solar radiation shielding device that controls the operation of a shielding material by a DC motor.

As one type of electric horizontal blind, there is one in which a slat can be moved up and down and the angle can be adjusted by a driving force of a DC motor controlled by a microcomputer.
In such an electric horizontal blind, it is necessary to supply, for example, a DC voltage of 26 V from the power supply circuit as a power source to the stepping motor and supply a DC voltage of 5 V as a power source voltage to the microcomputer.

  As a method of a power supply circuit for generating different DC power supply voltages, a switching power supply using an AC / DC converter is provided with a high-frequency transformer capable of outputting two types of AC voltages, and output from the high-frequency transformer 2 Some have a rectifier circuit that rectifies each type of AC voltage into a DC voltage.

  In such a power supply circuit, power consumption is generated in a high-frequency transformer that outputs two types of AC voltage, and power consumption is generated in a rectifier circuit that rectifies each AC voltage into a DC voltage.

  Therefore, one type of AC voltage is output from the high-frequency transformer, a DC voltage supplied to the motor is generated by one rectifier circuit based on the AC voltage, and a DC voltage for the microcomputer is generated from the DC voltage by a DC / DC converter. A power supply circuit to be generated has been proposed.

  Patent Document 1 includes a motor driving transformer, a control transformer, and a rectifier circuit that rectifies an AC voltage output from each transformer, and stops supply of commercial power to the motor driving transformer when the motor is stopped. An electric blind made as described above is disclosed.

JP 2008-163577 A

  In the power supply circuit that generates a DC voltage for a microcomputer with a DC / DC converter as described above, the DC / DC converter converts the 26V DC voltage generated for the stepping motor into 5V and supplies the DC / DC converter. The power loss due to the converter increases. This is because, in general, in a DC / DC converter, the power loss increases as the difference between the input voltage and the output voltage increases.

  In addition, although the operation time of the electric horizontal blind, that is, the operation time of the stepping motor is a little time compared to the stop time of the stepping motor, the AC voltage output from the high-frequency transformer is always a DC voltage in the rectifier circuit. Is output after being rectified. Therefore, the power loss in the rectifier circuit is also increased.

  The electric blind disclosed in Patent Document 1 has a configuration in which commercial power is stepped down and rectified by a motor driving transformer, a control transformer, and each rectifier circuit and supplied to a motor and a microcomputer. Therefore, it is necessary to provide a motor driving transformer and a control transformer separately, which increases the number of components and causes power loss in each transformer when the motor is operated.

  An object of the present invention is to provide a DC motor control device that supplies a DC voltage to a DC motor with an AC / DC converter and supplies a DC voltage to a microcomputer with a DC / DC converter that operates based on the output voltage of the AC / DC converter. Another object of the present invention is to provide a DC motor control device capable of generating a stable DC voltage while reducing power consumption.

In claim 1, an AC / DC converter that generates a DC voltage based on supply of AC power, a motor drive circuit that drives a DC motor based on supply of a DC voltage output from the AC / DC converter, and Electric solar shading comprising a microcomputer for controlling a motor drive circuit and a DC / DC converter for generating a second DC voltage to be supplied to the microcomputer based on a first DC voltage output from the AC / DC converter In the direct current motor control device that drives the solar shading material of the device, in the standby mode, the voltage adjustment that reduces the first direct current voltage generated by the AC / DC converter based on the voltage switching signal output from the microcomputer And the first DC voltage based on a control signal output from the microcomputer during the standby mode. And a switch for interrupting the supply to the motor drive circuit.

The AC / DC converter includes a rectifying / smoothing circuit that rectifies an AC power source into direct current, a switching unit that switches a DC voltage output from the rectifying / smoothing circuit and supplies the DC voltage to a primary coil of the high-frequency transformer, and the high-frequency A high-frequency rectifier circuit that rectifies a switching voltage output from a secondary coil of the transformer and outputs the rectified voltage, and the voltage adjustment unit generates the constant voltage using the first DC voltage; The input voltage is generated using the DC voltage and the voltage switching signal, and the constant voltage is compared with the input voltage, and the voltage level of the input voltage is determined based on the voltage switching signal. Switching between an H level higher than the voltage and an L level lower than the constant voltage, thereby making the result of the comparison a detection signal based on the voltage switching signal A comparison detection circuit for outputting the controlled based on the primary-side detection signal the duty of the switching voltage is supplied to the coil, and a control unit for controlling said first DC voltage by it.

According to a second aspect of the present invention, the switching unit includes a MOS transistor that performs a switching operation based on a control signal output from the control unit in a primary coil of the high-frequency transformer.

In claim 3 , an AC / DC converter that generates a DC voltage based on the supply of AC power, a motor drive circuit that drives a DC motor based on the supply of the DC voltage output from the AC / DC converter, A microcomputer for controlling the motor drive circuit; and a DC / DC converter for generating a second DC voltage to be supplied to the microcomputer based on a first DC voltage output from the AC / DC converter. In the electric solar shading device that drives the solar shading material with a motor, voltage adjustment for reducing the first DC voltage generated by the AC / DC converter based on a voltage switching signal output from the microcomputer in a standby mode And the first DC voltage based on the control signal output from the microcomputer during the standby mode. And a switch for interrupting the supply to the serial motor drive circuit. The AC / DC converter includes a rectifying / smoothing circuit that rectifies the AC power source into direct current, a switching unit that switches the DC voltage output from the rectifying / smoothing circuit and supplies the DC voltage to a primary coil of the high-frequency transformer, and the high-frequency A high-frequency rectifier circuit that rectifies and outputs a switching voltage output from a secondary coil of the transformer, and the voltage adjustment unit generates the constant voltage using the first DC voltage, and the first voltage The input voltage is generated using a DC voltage and the voltage switching signal, and the constant voltage is compared with the input voltage. The voltage level of the input voltage is determined based on the voltage switching signal. Switching to a higher H level and an L level lower than the constant voltage, whereby the comparison result is used as a detection signal based on the voltage switching signal. A comparison detection circuit for force control based on the duty of the switching voltage to be supplied to said primary coil to said detection signal, thereby a control unit for controlling said first DC voltage.

According to a fourth aspect of the present invention, AC power is converted into a DC voltage by an AC / DC converter and supplied to a motor drive circuit that drives a DC motor, and is also supplied to a microcomputer that controls the motor drive circuit via the DC / DC converter. , voltage adjusting unit, when the standby mode, on the basis of the voltage switching signal outputted from the microcomputer, together with lowering the DC voltage generated by the AC / DC converter, the supply of the DC voltage to the motor drive circuit The AC / DC converter includes a rectifying / smoothing circuit that rectifies the AC power source into a direct current, and a switching unit that switches the DC voltage output from the rectifying / smoothing circuit and supplies the DC voltage to the primary coil of the high-frequency transformer. And rectifying the switching voltage output from the secondary coil of the high-frequency transformer. A high-frequency rectifier circuit that outputs the constant voltage using the first DC voltage output from the AC / DC converter, and the first DC voltage and the voltage switching signal. The generation of the input voltage used and the comparison between the constant voltage and the input voltage are performed, and the voltage level of the input voltage is set to an H level higher than the constant voltage based on the voltage switching signal. Switching to an L level lower than a constant voltage, thereby outputting the comparison result as a detection signal based on the voltage switching signal, and detecting the duty of the switching voltage supplied to the primary coil And a control unit that controls the first direct-current voltage thereby to drive the solar shading material of the electric solar shading device .

  According to the present invention, in a DC motor control apparatus that supplies a DC voltage to a DC motor with an AC / DC converter and supplies a DC voltage to a microcomputer with a DC / DC converter that operates based on the output voltage of the AC / DC converter. It is possible to provide a DC motor control device that can generate a stable DC voltage while reducing power consumption.

It is a block diagram which shows the direct-current motor control apparatus of one Embodiment. It is a circuit diagram which shows the switching part and high frequency rectifier circuit of an AC / DC converter. It is a circuit diagram which shows a DC / DC converter. It is a circuit diagram which shows a comparison detection circuit. It is a timing waveform diagram which shows operation | movement of a DC motor control apparatus. It is a flowchart which shows operation | movement of a microcomputer.

  An embodiment of a DC motor control apparatus embodying the present invention will be described below with reference to the drawings. FIG. 1 shows a DC motor control device that controls the operation of a DC motor for adjusting the angle of a slat (sunlight shielding material) of an electric horizontal blind.

  AC 100V commercial AC power is supplied to the rectifying / smoothing circuit 2 of the AC / DC converter 1, and the rectifying / smoothing circuit 2 smoothes the input AC voltage Vac to the DC voltage Vdc 1 and outputs it to the switching unit 3. The switching unit 3 supplies a switching voltage to the primary coil L1 of the high-frequency transformer 5 based on the control signal CT output from the control unit 4.

  A switching voltage corresponding to the turn ratio with the primary coil L1 is induced in the secondary coil L2 of the high-frequency transformer 5, and the switching voltage is rectified to a DC voltage Vdc2 by the high-frequency rectifier circuit 6 and output.

  The DC voltage Vdc2 output from the high-frequency rectifier circuit 6 is input to the comparison detection circuit 8, and the voltage switching signal X is input to the comparison detection circuit 8 from the microcomputer 9. The comparison detection circuit 8 detects the voltage value of the DC voltage Vdc2 based on the voltage switching signal X, and outputs the detection signal Y to the control unit 4.

The control unit 4 controls the duty of the switching operation of the switching unit 3 based on the detection signal Y.
A specific configuration of the switching unit 3 is shown in FIG. The drain / source of the MOS transistor T1 is interposed in series at the intermediate point of the primary coil L1 of the high-frequency transformer 5.

  The source of the MOS transistor T1 is connected to the ground GND, and a capacitor C1 is connected between one terminal of the primary coil L1 to which the DC voltage Vdc1 is supplied from the rectifying and smoothing circuit and the ground GND.

  The other terminal of the primary coil L1 is connected to the ground GND via a diode D1 and a capacitor C2, and a connection point between the diode D1 and the capacitor C2 is connected to the control unit 4.

  A control signal CT is input from the control unit 4 to the gate of the MOS transistor T1, a 130 kHz rectangular signal is input to the control signal, and the duty of the rectangular signal is controlled. Accordingly, the MOS transistor T1 performs a switching operation at 130 kHz, and a switching current of 130 kHz flows through the primary side coil L1 of the high-frequency transformer 5.

  The high-frequency rectifier circuit 6 includes a diode D2 and a capacitor C3 connected between both terminals of the secondary coil L2 of the high-frequency transformer 5. The switching voltage induced in the secondary coil L2 based on the switching current flowing through the primary coil L1 is rectified to the DC voltage Vdc2 by the high frequency rectifier circuit 6, and the DC voltage Vdc2 is output from the cathode of the diode D2. .

  Further, by controlling the duty of the control signal CT, the DC voltage Vdc2 increases when the ON time of the MOS transistor T1 becomes long, and the DC voltage Vdc2 decreases when the ON time of the MOS transistor T1 becomes short. .

  A specific configuration of the comparison detection circuit 8 is shown in FIG. The DC voltage Vdc2 output from the high-frequency rectifier circuit 6 is input to the comparison detection circuit 8 as a power supply voltage, supplied with the DC voltage Vdc2 as a high potential side power supply, and supplied with the ground GND as a low potential side power supply.

  The negative input terminal of the comparator 10 receives a voltage obtained by dividing the DC voltage Vdc2 by the resistors R1 and R2, and a series circuit of the resistor R3 and the PNP transistor T2 is connected in parallel to the resistor R1.

  A voltage switching signal X is input from the microcomputer 9 to the base of the PNP transistor T2. The voltage switching signal X is switched between 10V and 3V, for example. Then, the collector current of the PNP transistor T2 is switched based on the switching of the voltage switching signal X, and as a result, the input voltage at the minus side input terminal of the comparator 10 changes.

  A Zener diode ZD is connected between the plus side input terminal of the comparator 10 and the ground GND, and a resistor R4 is connected between the plus side input terminal of the comparator 10 and the DC voltage Vdc2. A constant voltage set by the Zener diode ZD is input to the plus side input terminal of the comparator 10.

  In such a comparator 10, when the input voltage at the plus side input terminal becomes higher than the input voltage at the minus side input terminal, the output signal becomes H level, and when the input voltage at the plus side input terminal becomes lower than the input voltage at the minus side input terminal. The output signal becomes L level.

  The output terminal of the comparator 10 is connected to the cathode of the photodiode D3 constituting the photocoupler 11, and the DC voltage Vdc2 is supplied to the anode of the photodiode D3 via the resistor R5.

  The collector and emitter of the phototransistor T3 constituting the photocoupler 11 are connected to the control unit 4 and become conductive based on the ON operation of the photodiode D3. When the output signal of the comparator 10 becomes L level, the photodiode D3 is turned on, and the phototransistor T3 is turned on.

  When the phototransistor T3 becomes conductive, the control unit 4 controls the duty so as to shorten the on-time of the MOS transistor T1, thereby reducing the DC voltage Vdc2 output from the high-frequency rectifier circuit 6. When the phototransistor T3 is turned off, the duty is controlled so as to extend the on-time of the MOS transistor T1, and the DC voltage Vdc2 output from the high-frequency rectifier circuit 6 is increased.

  In the feedback loop including the comparison detection circuit 8, the control unit 4, the switching unit 3, and the high frequency rectification circuit 6 as described above, when the voltage switching signal X input to the comparison detection circuit 8 becomes 3V, the high frequency rectification circuit 6 outputs the voltage. The DC voltage Vdc2 to be operated operates so as to converge to 26V.

Further, when the voltage switching signal X input to the comparison detection circuit 8 becomes 10V, the DC voltage Vdc2 output from the high frequency rectification circuit 6 operates so as to converge to 7V.
As shown in FIG. 1, the DC voltage Vdc2 output from the high-frequency rectifier circuit 6 is supplied to the motor drive circuit 7 as a power supply voltage Vdc4 via a switch 12 that is opened and closed based on a control signal DV1 output from the microcomputer 9. Supplied.

  When the switch 12 is closed, the DC voltage Vdc2 is supplied to the motor drive circuit 7 as the power supply voltage Vdc4, and the motor drive circuit 7 drives the DC motor 14 based on the control signal DV2 output from the microcomputer 9. When the switch 12 is opened, the power supply voltage Vdc4 supplied to the motor drive circuit 7 is 0V.

  The DC voltage Vdc2 output from the high frequency rectifier circuit 6 is supplied to the DC / DC converter 15. The DC / DC converter 15 converts the input 26V or 7V DC voltage Vdc2 into a 5V DC voltage and supplies it to the microcomputer 9 as a power source.

  The principle of the DC / DC converter 15 is shown in FIG. The DC voltage Vdc2 supplied from the high frequency rectifier circuit 6 is supplied to the drain of the MOS transistor T4. The source of the MOS transistor T4 is connected to the cathode of the diode D4 and one end of the choke coil L.

  The anode of the diode D4 is connected to the ground GND, and the other end of the choke coil L is connected to the ground GND via the capacitor C4. The DC voltage Vdc3 is supplied from the other end of the choke coil L to the microcomputer 9 as a power source.

  In the DC / DC converter 15 configured as described above, switching control is performed based on a control signal SW input from the DC / DC converter 15 control unit (not shown) to the gate of the MOS transistor T4.

  When the MOS transistor T4 is turned on, the drain current I1 is supplied to the choke coil L and the capacitor C4 and smoothed. When the MOS transistor T4 is turned off, a regenerative current I2 flows from the other end of the choke coil L to one end of the choke coil L via the capacitor C4 and the diode D4 due to the back electromotive force generated in the choke coil L.

  With such an operation, the DC voltage Vdc3 is generated and output based on the supply of the DC voltage Vdc2. The duty of the control signal SW for controlling the switching of the MOS transistor T4 is controlled such that the on-time of the MOS transistor T4 becomes longer as the DC voltage Vdc2 becomes lower. Vdc3 is generated.

  Further, since the power loss between the drain and the source of the MOS transistor T4 is smaller than the power loss between the anode and the cathode of the diode D4, as the ON time of the MOS transistor T4 becomes longer than the ON time of the diode D4, the DC / The power efficiency of the DC converter 15 is increased.

Accordingly, the power efficiency of the DC / DC converter 15 is higher when the DC voltage Vdc2 is 7V than when the supplied DC voltage Vdc2 is 26V.
The microcomputer 9 outputs an operation signal CM1 output from an operation switch (not shown) of the electric horizontal blind or a command signal CM2 output from a central controller (not shown) that collectively controls the operation of a large number of electric horizontal blinds. Based on the program set in advance.

  In the normal mode, the microcomputer 9 turns on the switch 12 by the control signal DV1 to supply the DC voltage Vdc2 to the motor drive circuit 7, and outputs the control signal DV2 to the motor drive circuit 7 to control the operation of the motor 14. . Further, a 10 V voltage switching signal X is output to the comparison detection circuit 8.

  In the standby mode, the microcomputer 9 opens the switch 12 by the control signal DV1 to cut off the power supply to the motor drive circuit 7, and outputs the control signal DV2 to the motor drive circuit 7 to stop the operation of the motor drive circuit 7. Let The comparison detection circuit 8 outputs a voltage switching signal X of 3V.

Next, the operation of the DC motor control device configured as described above will be described with reference to FIGS.
When AC 100 V is supplied to the AC / DC converter 1, a DC voltage Vdc 2 is output from the AC / DC converter 1, and a DC voltage Vdc 3 of 5 V is supplied from the DC / DC converter 15 to the microcomputer 9 as a power source.

  The microcomputer 9 initializes the position information of the slats of the electric horizontal blind based on the supply of power (step 1) and shifts to the standby mode (step 2). In the standby mode, the microcomputer 9 outputs the control signal DV1 to the switch 12 to cut off the DC voltage Vdc2 to the motor drive circuit 7, so that the power supply voltage Vdc4 of the motor drive circuit 7 becomes 0V. Further, the microcomputer 9 outputs a control signal DV2 to the motor drive circuit 7 to stop the operation of the motor drive circuit 7.

  Further, the microcomputer 9 outputs a voltage switching signal X of 10V to the comparison detection circuit 8. Then, the ON time of the MOS transistor T1 is shortened by the control signal CT output from the control unit 4 to the switching unit 3, and the DC voltage Vdc2 output from the high-frequency rectifier circuit 6 becomes 7V.

The DC / DC converter 15 generates a DC voltage Vdc3 of 5V from the DC voltage Vdc2 and supplies it to the microcomputer 9.
Next, the microcomputer 9 waits for the input of the operation signal CM1 from the operation switch or the command signal CM2 from the central controller (steps 3 and 4).

  When either the operation signal CM1 or the command signal CM2 is input, the microcomputer 9 shifts to the operation mode (step 5). In the operation mode, the microcomputer 9 outputs a 3 V voltage switching signal X to the comparison detection circuit 8. Then, the ON time of the MOS transistor T1 is lengthened by the control signal CT output from the control unit 4 to the switching unit 3, and the DC voltage Vdc2 output from the high frequency rectifier circuit 6 becomes 26V.

The DC / DC converter 15 generates a DC voltage Vdc3 of 5V from the DC voltage Vdc2 and supplies it to the microcomputer 9.
Further, the microcomputer 9 closes the switch 12 with the control signal DV1, and supplies the DC voltage Vdc2 of 26V to the motor drive circuit 7 as the power supply voltage Vdc4. Further, the microcomputer 9 outputs the control signal DV2 to the motor drive circuit 7, and operates the motor drive circuit 7 based on the operation signal CM1 or the command signal CM2 (step 6).

  Next, when neither the operation signal CM1 nor the command signal CM2 is input for a predetermined time or more (step 7), the process proceeds to step 2 to enter a standby mode, and waits for the input of the operation signal CM1 and the command signal CM2.

  In the standby mode, as described above, the microcomputer 9 outputs the control signal DV1 to the switch 12 to cut off the DC voltage Vdc2 to the motor drive circuit 7, so that the power supply voltage Vdc4 of the motor drive circuit 7 becomes 0V. Further, the microcomputer 9 outputs a control signal DV2 to the motor drive circuit 7 to stop the operation of the motor drive circuit 7.

  Further, the microcomputer 9 outputs a voltage switching signal X of 10V to the comparison detection circuit 8. Then, the DC voltage Vdc2 output from the high-frequency rectifier circuit 6 is 7V by the control signal CT output from the control unit 4 to the switching unit 3.

The DC / DC converter 15 generates a DC voltage Vdc3 of 5V from the DC voltage Vdc2 and supplies it to the microcomputer 9.
In the DC motor control device configured as described above, the following effects can be obtained.
(1) In the operation mode, the DC voltage Vdc2 of 26V from the AC / DC converter 1 can be supplied to the motor drive circuit 7 to drive the motor 14, and in the standby mode, the DC voltage of 7V from the AC / DC converter 1 Vdc2 can be output. Therefore, compared with the case where the DC voltage Vdc2 of 26V is continuously output from the AC / DC converter 1 in the standby mode, the power loss in the switching unit 3, the high frequency transformer 5, and the high frequency rectifier circuit 6 can be reduced.
(2) In the operation mode and standby mode, the DC / DC converter 15 generates a DC voltage Vdc3 of 5V based on the DC voltage Vdc2 of 26V or 7V output from the AC / DC converter 1, and supplies the microcomputer 9 as a power source. Can be supplied. Therefore, the microcomputer 9 can always be operated stably.
(3) In the standby mode, the AC / DC converter 1 can output a DC voltage Vdc2 of 7V. Therefore, the efficiency of the DC / DC converter 15 in the standby mode can be improved and the power consumption can be reduced.
(4) In the standby mode, the supply of the DC voltage Vdc2 to the motor drive circuit 7 can be cut off. Therefore, the power consumption in the motor drive circuit 7 in the standby mode can be reliably reduced to zero.
(5) As shown in FIG. 5, the total power consumption Tw of the DC motor control device and the motor 14 is 40 W in the operation mode in which the motor 14 is operated, and is about 3 W when the motor 14 is stopped. In the standby mode, the DC voltage Vdc2 output from the AC / DC converter 1 is reduced to 7V, and the supply of the DC voltage Vdc2 to the motor drive circuit 7 is cut off, so that the total power consumption Tw is 0.5 W. It can be reduced to the extent.
(6) In the electric horizontal blind in which the time for the standby mode is sufficiently longer than the time for the operation mode, the total power consumption can be greatly reduced by reducing the power consumption in the standby mode.

You may implement the said embodiment in the following aspects.
-In addition to the electric horizontal blind, it can also be implemented as a DC motor control device such as a roll blind, awning, shutter, vertical blind using a DC motor.

  DESCRIPTION OF SYMBOLS 1 ... AC / DC converter, 2 ... Rectification smoothing circuit, 3 ... Voltage adjustment part (switching part), 4 ... Voltage adjustment part (control part), 5 ... High frequency transformer, 6 ... High frequency rectification circuit, 7 ... Motor drive circuit, DESCRIPTION OF SYMBOLS 8 ... Voltage adjustment part (comparison detection circuit), 9 ... Microcomputer, 12 ... Switch, 14 ... DC motor, 15 ... DC / DC converter, Vdc2 ... First DC voltage, Vdc3 ... Second DC voltage, X ... Voltage Switching signal, DV1 ... control signal, Y ... detection signal.

Claims (4)

An AC / DC converter that generates a DC voltage based on an AC power supply;
A motor drive circuit for driving a DC motor based on supply of a DC voltage output from the AC / DC converter;
A microcomputer for controlling the motor drive circuit;
DC for driving a solar shading material of an electric solar shading device comprising a DC / DC converter for generating a second DC voltage to be supplied to the microcomputer based on a first DC voltage output from the AC / DC converter In motor control equipment,
A voltage adjusting unit that reduces the first DC voltage generated by the AC / DC converter based on a voltage switching signal output from the microcomputer during the standby mode;
During the standby mode, based on the control signal outputted from the microcomputer, and a switch for interrupting the supply to the motor driving circuit of the first DC voltage,
The AC / DC converter is
A rectifying / smoothing circuit for rectifying the alternating current power source into direct current;
A switching unit that switches the DC voltage output from the rectifying and smoothing circuit and supplies the DC voltage to the primary coil of the high-frequency transformer;
A high-frequency rectifier circuit that rectifies and outputs a switching voltage output from a secondary coil of the high-frequency transformer,
The voltage regulator is
Performing the generation of a constant voltage using the first DC voltage, the generation of an input voltage using the first DC voltage and the voltage switching signal, and a comparison between the constant voltage and the input voltage; The voltage level of the input voltage is switched between an H level higher than the constant voltage and an L level lower than the constant voltage based on the voltage switching signal, whereby the result of the comparison is changed to the voltage switching signal. A comparison detection circuit that outputs a detection signal based on
A control unit for controlling the duty of the switching voltage supplied to the primary coil based on the detection signal, thereby controlling the first DC voltage;
A direct current motor control device comprising: The switching unit is a direct current motor control apparatus according to claim 1, characterized in that a MOS transistor for switching operation based on a control signal outputted from the control unit is interposed in the primary side coil of the high-frequency transformer. An AC / DC converter that generates a DC voltage based on an AC power supply;
A motor drive circuit for driving a DC motor based on supply of a DC voltage output from the AC / DC converter;
A microcomputer for controlling the motor drive circuit;
A DC / DC converter that generates a second DC voltage to be supplied to the microcomputer based on a first DC voltage output from the AC / DC converter;
In the electric solar shading device that drives the solar shading material with the DC motor,
A voltage adjusting unit that reduces the first DC voltage generated by the AC / DC converter based on a voltage switching signal output from the microcomputer during the standby mode;
During the standby mode, based on the control signal outputted from the microcomputer, and a switch for interrupting the supply to the motor driving circuit of the first DC voltage,
The AC / DC converter is
A rectifying / smoothing circuit for rectifying the alternating current power source into direct current;
A switching unit that switches the DC voltage output from the rectifying and smoothing circuit and supplies the DC voltage to the primary coil of the high-frequency transformer;
A high-frequency rectifier circuit that rectifies and outputs a switching voltage output from a secondary coil of the high-frequency transformer,
The voltage regulator is
Performing the generation of a constant voltage using the first DC voltage, the generation of an input voltage using the first DC voltage and the voltage switching signal, and a comparison between the constant voltage and the input voltage; The voltage level of the input voltage is switched between an H level higher than the constant voltage and an L level lower than the constant voltage based on the voltage switching signal, whereby the result of the comparison is changed to the voltage switching signal. A comparison detection circuit that outputs a detection signal based on
A control unit for controlling the duty of the switching voltage supplied to the primary coil based on the detection signal, thereby controlling the first DC voltage;
An electric solar shading device characterized by comprising: An AC power source is converted into a DC voltage by an AC / DC converter and supplied to a motor driving circuit that drives a DC motor, and the DC voltage is supplied to a microcomputer that controls the motor driving circuit via the DC / DC converter, in the voltage regulator, when the standby mode, on the basis of the voltage switching signal outputted from the microcomputer, together with lowering the DC voltage generated by the AC / DC converter, the supply of the DC voltage to the motor drive circuit Shut off,
The AC / DC converter is
A rectifying / smoothing circuit for rectifying the alternating current power source into direct current;
A switching unit that switches the DC voltage output from the rectifying and smoothing circuit and supplies the DC voltage to the primary coil of the high-frequency transformer;
A high-frequency rectifier circuit that rectifies and outputs a switching voltage output from a secondary coil of the high-frequency transformer,
The voltage regulator is
Generation of a constant voltage using the first DC voltage output from the AC / DC converter, generation of an input voltage using the first DC voltage and the voltage switching signal, and the constant voltage and the input voltage And the voltage level of the input voltage is switched between an H level higher than the constant voltage and an L level lower than the constant voltage based on the voltage switching signal.
Thus, a comparison detection circuit that outputs the result of the comparison as a detection signal based on the voltage switching signal;
A control unit that controls the duty of the switching voltage supplied to the primary coil based on the detection signal, thereby controlling the first DC voltage.
A direct current motor control method for driving a solar shading material of an electric solar shading device .

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