JP2972030B2 - Electric curtain drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric curtain driving device for automatically opening and closing a curtain.

[0002]

2. Description of the Related Art In an electric curtain driving device for automatically opening and closing a curtain, in order to be able to open and close the curtain by arbitrary measurement using a motor, the motor is affected by fluctuations in the weight of the curtain and the power supply voltage. Therefore, some kind of speed control means for controlling the speed of the motor is required.

FIG. 3 shows a conventional general curtain driving device. The curtain driving device includes a motor M for driving the curtain, a power supply unit 2 for supplying power to the motor M, and four relay contacts for switching the polarity of the voltage applied to the motor M to open or close the curtain. A polarity switching unit 3, a switch unit 4 including a relay contact for stopping the motor M by interrupting the supply of power to the motor M, a speed detection unit 5 for detecting the speed of the motor M, and a motor current supply. Switching element Q inserted in line
And controlling the switching of the polarity switching unit 3 and the switch unit 4 according to the operation input of the operation unit 6 to control the driving direction and stop of the motor, and to control the switching element Q according to the detection output of the speed detection unit 5. The control unit 1 includes a microcomputer that controls the speed of the motor M by adjusting the motor current from the power supply unit 2 by performing switching.

[0004] In the electric curtain driving apparatus of this type, common DC motor is used as the motor M, the direct current motor the motor current I _M to the excitation phase switching換毎changes as shown in FIG. 2 (a). Therefore, in the velocity detecting unit 5, Yes as the speed detected by detecting the motor current I _M, and detects the motor current I _M for example by using a current transformer. A pulse-like output shown in FIG. 2B is generated at the output of the speed detector 5 using the current transformer.

The power supply unit 2 comprises, for example, a power transformer T for stepping down a commercial power supply AC, a diode bridge DB for rectifying a step-down output, and a smoothing capacitor C for smoothing a rectified output. The control unit 1 inputs the output of the speed detection unit 5 through a filter, extracts only the speed component of the motor M from the output of the speed detection unit 5, compares it with a reference voltage indicated by a broken line in FIG. The signal is converted into a pulse train signal composed of a negative pulse signal shown in FIG. 3C, and the motor speed is detected from the falling interval of the speed signal. Then, the motor speed is compared with the set speed set by the speed setting unit 7 to keep the curtain opening / closing speed at the set speed. Now, when the motor speed is higher than the set speed, the switching of the switching element Q is performed so as to lower the output voltage. When the motor speed is lower than the set speed, a command to increase the output voltage is given. The switching of the switching element Q is performed. Here, the motor current is adjusted by adjusting the ON period of the switching element Q.

[0006]

However, the power supply unit 2 of the electric curtain driving device uses the power supply transformer T to insulate it from the commercial power supply and to reduce the power supply voltage. For this reason, there has been a disadvantage that the electric curtain driving device is large and heavy. Therefore, the power supply unit 2
For example, a switching power supply that creates a DC voltage to be applied to the motor M by converting a DC voltage obtained by rectifying and smoothing a commercial power supply AC into an AC voltage using an inverter and further rectifying and smoothing the inverter output. The electric curtain driving device used is proposed in Japanese Patent Application Laid-Open No. 3-139189.

However, such a power supply unit 2 requires a high-frequency switching element and a high-frequency transformer, so that the cost is high and measures to suppress electromagnetic noise generated by switching of the switching element are required. There is a problem that measures against heat generation are required. The present invention has been made in view of the above points, and an object of the present invention is to provide an electric curtain driving device which is small and lightweight and does not require measures for suppressing electromagnetic noise and measures for heat generation.

[0008]

SUMMARY OF THE INVENTION An electric curtain drive according to the present invention is provided.
In order to achieve the above object, the driving device includes a motor for opening and closing the curtain, an operation unit for opening and closing the curtain, and opening and closing and stopping the curtain by driving and controlling the motor in accordance with an input from the operation unit. Opening and closing control means for performing control;
A speed setting unit for setting the opening / closing speed of the curtain, a speed control unit for detecting the opening / closing speed of the curtain and performing speed control for matching the opening / closing speed to the speed set by the speed setting unit, and supplying power required for driving the motor Power supply means,
The power supply means includes a step-down power transformer and this power supply.
A rectifier circuit that rectifies the step-down output of the source transformer and this rectifier
A charging circuit that obtains charging power from the output of the circuit;
Charge mainly when the curtain is not operating due to current from the road.
And rechargeable power storage means .

[0009]

According to the electric curtain drive device of the present invention , the motor drive
Since power for operation is supplied from the rechargeable power storage means,
Electromagnetic noise from switching elements and transformers for waves
Generation of heat and heat generation are eliminated. As a result, electromagnetic noise
Therefore, it is not necessary to take measures for suppressing the heat generation and measures for generating heat. Ma
In addition, when the rechargeable power storage means is mainly
The battery is charged for a sufficient amount of time,
Charging becomes possible. As a result, the charging circuit is simplified.
As well as a compact and lightweight step-down power supply
Lance can be used in electric car
The ten drive device can be reduced in size and weight .

[0010]

FIG. 1 shows an embodiment of the present invention. The configuration of the present embodiment is basically the same as that described with reference to FIG. 3.
And a rechargeable battery B charged by the charging circuit 21.

With such a configuration, the charging of the battery B is mainly performed when the curtain is not operating, and the charging current of the battery B at this time is a very small current. Accordingly, a small and light power transformer T can be used as the step-down power transformer T, and the electric curtain driving device can be reduced in size and weight. Also,
By using a device other than the converter system using the switching element as the charging circuit 21, it is not necessary to take measures to suppress electromagnetic noise and heat. The energy stored in the battery B is supplied as driving power for the motor M.

The control unit 1 of the electric curtain driving device has the following structure. That is, the output V _CT of the current transformer as the speed detection unit 5 (FIG. 2)
(A) is compared with a reference voltage E, and the waveform shaping circuit 11 shapes the waveform into a pulse train signal composed of a negative pulse shown in FIG. A frequency-voltage conversion circuit (hereinafter referred to as an FV conversion circuit) 12 for converting a frequency into a voltage signal;
A comparison circuit 13 that outputs a difference signal between the output of the -V conversion circuit 12 and the output of the speed setting unit 7; and a pulse width modulation signal (PWM signal) that changes the on-duty of the switching element Q according to the difference signal. A PWM circuit 14 that performs
It comprises a polarity switching unit 3 and a relay control unit 15 for opening and closing the relay contacts of the switch unit 4 in accordance with an input from the operation unit 6.

In the control unit 1, the PWM circuit 14 controls the on-period of the switching element Q so that the difference between the speed detected by the speed detection unit 5 and the speed set by the setting unit 7 becomes zero, thereby reducing the motor current. Adjustment is performed and feedback control is performed so that the motor speed matches the set speed. In this type of electric curtain driving device, when the curtain reaches the end of the curtain rail, the driving of the motor M is stopped, and the excitation phase is not switched. At this time, since the pulse train signal is not output from the waveform shaping circuit 11, it is detected that the pulse train signal has disappeared, and
To automatically stop the supply of the current to the motor M. In addition, rechargeable
A large capacity capacitor can be used instead of a pond.
Needless to say.

[0014]

As described above, according to the present invention, a motor for opening and closing a curtain, an operation unit for opening and closing the curtain, and a drive control of the motor in accordance with an input from the operation unit to control the curtain. Opening / closing control means for controlling opening / closing and stopping of the vehicle, a speed setting unit for setting the opening / closing speed of the curtain, and speed control for detecting the opening / closing speed of the curtain and performing speed control for matching the opening / closing speed to the speed set by the speed setting unit Means, and power supply means for supplying electric power required for driving the motor, wherein the power supply means comprises a step-down power transformer.
And a rectifier circuit that rectifies the step-down output of this power transformer
And a charging circuit that obtains charging power from the output of the rectifier circuit
And the current from this charging circuit
It consists of rechargeable power storage means that is charged during operation.
It is necessary to take measures to suppress electromagnetic noise and generate heat.
And the battery can be charged with a very small current.
Thus, the size and weight of the electric curtain driving device can be reduced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of one embodiment of the present invention.

FIG. 2 is an operation explanatory view of the above.

FIG. 3 is a circuit diagram of a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 control unit 2 power supply unit 3 polarity switching unit 4 switch unit 5 speed detection unit 6 operation unit 7 speed setting unit 21 charging circuit M motor B rechargeable battery Q switching element

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) H02P 5/00-5/26 H02P 7/00-7/34 A47H 5/02 H02J 7/00

Claims (1)

(57) [Claims] 1. A motor for opening and closing a curtain, an operation unit for opening and closing the curtain, and an opening and closing control unit for driving and controlling the motor in accordance with an input from the operation unit to open and close the curtain. A speed setting unit that sets the opening / closing speed of the curtain, a speed control unit that detects the opening / closing speed of the curtain and performs speed control to match the opening / closing speed to the speed set by the speed setting unit, and supplies power necessary for driving the motor. and a power supply means for the said power supply means, the step-down
Power transformer and the step-down output of this power transformer.
Rectifier circuit and charge power from the output of this rectifier circuit.
Mainly by the charging circuit obtained and the current from this charging circuit
An electric curtain driving device, comprising: rechargeable power storage means that is charged when the curtain is not operating .