JPH03139189A - Motor curtain drive unit - Google Patents

Abstract

PURPOSE:To obtain a small, light and highly efficient motor curtain drive unit by feeding a high frequency AC rectangular waveform, produced through switching operation with a switching element according to the speed signal of a curtain, to a high frequency transformer and then rectifying and smoothing the high frequency output from the high frequency transformer and applying a DC voltage onto a motor. CONSTITUTION:An AC input voltage Va from a commercial power supply is rectified through a rectifier D1 and smoothed through a capacitor C1 thus being converted into a DC voltage. The DC voltage is then inverted through a transistor Q1 into an AC rectangular waveform which is fed to a high frequency transformer T1. The AC rectangular wave voltage is then rectified through a rectifier D2 on the secondary of the high frequency transformer T1, smoothed through a choke coil L1 and a capacitor C2 and outputted as a DC output voltage V2. The DC output voltage V2 is then fed to a switching relay circuit R1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electric curtain drive device that controls opening and closing of curtains using a switch or the like.

[Prior Art] When a motor is used to open and close a curtain at a desired speed, the curtain opening and closing speed is affected by curtain weight and power supply voltage fluctuations, so some kind of constant speed control is required.

Conventionally, the speed control of a general DC motor is performed by converting the commercial power AC into a rated DC voltage that is applied to the motor coil using a transformer T2, a diode bridge DB, and a smoothing capacitor C3, as shown in Figure 3. , detection circuit 10
The speed feedback signal obtained is converted into a constant current source using an operational amplifier, transistor 2, etc.
The voltage applied to the motor coil was controlled. This method directly controls the motor coil current, so
Although it has the advantage of providing high-speed response, commercial power supply A
Since C is isolated and stepped down using the transformer T2, there is a problem that the transformer T2 is large and heavy.

In addition, as another conventional example, when controlling electric curtains by remote control, etc., the input signal to the drive device is generally given by a trigger, and one trigger input starts the curtain, and the curtain is completely opened. Or closed, when the motor is in forced stop state, the motor coil current needs to be cut off.

Traditionally, this type of electric curtain driving device using commercial power starts the motor with a single trigger input, and usually takes longer than the longest time until the curtain is completely opened or closed and the 5 motors are forced to stop. A timer with a long time setting or a sensor that detects the forced stop position was used to cut off the motor coil current. However, when a timer is used, even though the motor is in a forced stop state, the motor coil current continues to flow until the time set by the timer, causing the motor and drive unit to generate heat, shortening its life and reducing efficiency. However, if a sensor is used, the sensor and its signal processing circuit are required, making the drive device complicated and expensive.

[Problems to be Solved by the Invention] In the above conventional method, when controlling the curtain opening/closing speed,
The rated DC voltage applied to the motor is obtained from a commercial power supply using a transformer, which has the problem of being large and heavy. When controlling electric curtains with trigger input, the life and efficiency of the motor and drive device are shortened. It may get worse or the drive device is expensive.

The problem was that it was complicated.

The present invention has been provided in view of the above-mentioned points, and is a simple, compact, lightweight, and highly efficient electric curtain drive that can control curtain opening/closing speed by controlling curtain opening/closing speed and by inputting a trigger such as remote control. The purpose is to provide equipment.

[Means for Solving the Problems] The present invention provides a high-frequency transformer whose primary side is connected in parallel to a DC power source obtained by rectifying and smoothing a commercial power source via a switching element, and a secondary side of this high-frequency transformer. A DC smoothing circuit supplies DC voltage that rectifies and smoothes the high frequency output from the motor, a speed detection circuit that detects the curtain opening/closing speed, and a constant curtain opening/closing speed based on the signal from the speed detection circuit. The constant speed control means is composed of a control circuit that controls on/off of the switching element in order to control the switching element.

Further, in claim 2, when the curtain reaches the end of the rail, a speed detection means detects that the opening and closing of the curtain has stopped, and an automatic curtain stop circuit is provided that cuts off the power supply being supplied to the motor. It is something.

[Function] Therefore, the DC voltage obtained by rectifying and smoothing the commercial power supply is
A switching element supplies intermittent high-frequency rectangular wave alternating current to a high-frequency transformer according to the curtain speed signal, and the high-frequency output of the high-frequency transformer is rectified and smoothed to apply DC voltage to the motor, thereby reducing the size of the transformer. It is possible.

Further, in claim 2, using the speed signal of the curtain,
When the curtain is completely opened or stopped and the motor is forcibly stopped, the power supply to the motor is cut off and the motor coil current is cut off to prevent the motor and drive device from generating heat. There is.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure shows a circuit diagram of the present invention, where the switch SW1 is for turning on/off the commercial power supply AC, and the operation switch SW2 is a switch for opening/closing the curtain. The AC input voltage Va of the commercial power supply AC is rectified by a rectifier D1 and smoothed by a smoothing capacitor C3. The output voltage from the secondary side of the high-frequency transformer T1 in the switching transistor Q is rectified by a rectifier D2, smoothed by a choke coil L1 and a smoothing capacitor C2, and becomes a DC output voltage Vd.
get. Incidentally, a DC smoothing circuit is constituted by the above-mentioned rectifier, choke coil L3, capacitor C2, etc. The motor M is rotated forward and reverse by the relay circuit R1 to open and close the curtain. Note that the motor M is built into the curtain rail.

An encoder 1 forming a speed detection circuit detects the speed or rotation of the motor M, and its output is converted to voltage by an FV converter 2, which forms a control circuit via an error amplifier 3 and an adder 4. The signal is input to the pulse width control circuit 5 which performs the pulse width control circuit 5.

This pulse width control circuit 5 PWMs the transistor Q1.
Control. Also, the output of encoder 1 is timer 6.7
and is input to the logic control circuit 8, and in the logic control circuit 8,
Receives the signal from the operation switch SW2, and also receives the signal from the operation switch SW2.
, to control on/off.

The operation switch SW7, logic control circuit 8, etc. constitute an opening/closing control means, and the FV converter 2, error amplifier 3, etc.
, adder 4, pulse width control circuit 5, etc. constitute a constant speed control means.

The operation will be explained below. AC input voltage V of commercial power supply AC
A is rectified by a rectifier D1, smoothed by a capacitor CI, converted into a DC voltage, and supplied to a high frequency transformer T as a rectangular wave alternating current interrupted by a transistor Q. The rectangular wave AC voltage converted into the secondary winding of the high frequency transformer T1 is rectified by a rectifier D2, smoothed by a choke coil L1 and a capacitor C2, and output as a DC output voltage Vd, which is used for switching between open and close. It is supplied to relay circuit R7.

The relay circuit R3 has an H-bridge configuration, and is controlled by the logic control circuit 8, and supplies positive and negative DC output voltages to the motor M incorporated in the curtain rail. As shown in (a), a pulse V with a frequency proportional to the speed of the motor M is output,
This pulse (1) is converted into a DC output voltage by the FV converter 2. The output voltage from the F converter 2 is compared with the reference voltage Vr for speed setting in an error amplifier 3, and the error voltage output from the error amplifier 3 and the above reference voltage Vr are added in an adder 4 to obtain the result. The pulse width control circuit 5 supplies a pulse width-controlled rectangular wave to the transistor Q1, controls the speed of the motor M, and controls the opening and closing of the curtain.

The operation of timer 6.7 is as follows. Timer 6 is
A retriggerable timer that detects the presence or absence of pulses from encoder 1, as shown in Figure 2(b).
At the falling edge of the pulse VI from , the output voltage v6 shifts from the L level to the H level, and returns to the L level again after a certain period of time.

This time is set to be longer than the period of pulse 1 generated by encoder 1 when the curtain is opened and closed at the lowest speed. The output voltage V of the timer 7 shifts from the L level to the H level at the falling edge of the output voltage V6 of the timer 6, and shifts to the L level again after a certain period of time. Therefore, the output voltage V of the timer 7 is normally at the L level, and changes from the L level to the H level when the motor M incorporated in the curtain rail is forcibly stopped and the pulse 1 of the encoder 1 is stopped.

The logic control circuit 8 processes the logic signals supplied by the operation switch SW2 and the timer 7 to control the power on/off switch SW1 and the relay circuit R8. For example, when a command to open the curtains is input from the operation switch SW2. When the curtain is opened, the relay circuit R1 for opening/closing is switched so that the motor M operates in the direction in which the curtain opens, and the switch s is turned on.
Turn on w. Input a command to stop the curtain opening/closing operation from the operation switch SW2, or input the output voltage V of the timer 7,
When the voltage reaches H level, the power on/off switch SW is opened and the curtain opening/closing operation is stopped. Incidentally, the timer 6, 7, logic control circuit 8, etc. constitute an automatic curtain stop circuit.

[Effects of the Invention] As described above, the present invention includes a high-frequency transformer whose primary side is connected in parallel to a DC power source obtained by rectifying and smoothing a commercial power source via a switching element, and a two-way transformer of this high-frequency transformer.
A DC smoothing circuit supplies the motor with a DC voltage obtained by rectifying and smoothing the high frequency output from the next side, a speed detection circuit detects the opening and closing speed of the curtain, and a signal from the speed detection circuit detects the opening and closing speed of the curtain. Since the constant speed control means is composed of a control circuit that turns on and off the switching element to maintain a constant speed, the DC voltage obtained by rectifying and smoothing the commercial power source is adjusted according to the curtain speed signal. By supplying intermittent high-frequency rectangular wave alternating current to a high-frequency transformer using a switching element, and rectifying and smoothing the high-frequency output of the high-frequency transformer to apply DC voltage to the motor, the transformer can be miniaturized and the drive device This has the effect of making it possible to reduce the size and weight of the device.

Further, in claim 2, an automatic curtain stop circuit is provided which detects that opening/closing of the curtain has stopped when the curtain does not reach the end of the rail, and cuts off the power supplied to the motor by means of a speed detection means. Therefore, using the speed signal of the curtain, it detects when the curtain is completely opened or stopped and the motor is forced to stop, cuts off the power supplied to the motor, and cuts off the motor coil current. This prevents the motor and drive device from generating heat, resulting in a longer life and higher efficiency.In addition, as there is no need for sensors and their signal processing circuits as in the past, the drive device can be simplified and
This has the effect of making it possible to reduce costs.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram of an embodiment of the present invention, FIG. 2 is an operational waveform diagram of the same, and FIG. 3 is a circuit diagram of a conventional example. AC is a commercial power source, T is a high frequency transformer, and M is a motor.

Claims (2)

[Claims] (1) A motor that drives the curtain to open and close and is built into the curtain rail and is forced to stop while the power is applied when the curtain is completely opened or closed. In an electric curtain drive device that is equipped with an opening/closing control means that controls opening, closing, and stopping, and a constant speed control means that detects the opening/closing speed of the curtain and opens and closes the curtain at a constant speed at a set speed, a commercial power supply is provided. A high-frequency transformer whose primary side is connected in parallel to the DC power obtained by rectifying and smoothing the DC power, and a DC voltage obtained by rectifying and smoothing the high frequency output from the secondary side of this high-frequency transformer is supplied to the motor. a DC smoothing circuit that detects the opening and closing speed of the curtain, a speed detection circuit that detects the opening and closing speed of the curtain, and a control circuit that receives the signal from the speed detection circuit and controls the switching element on and off in order to keep the opening and closing speed of the curtain constant. An electric curtain drive device comprising the constant speed control means described above. (2) When the curtain reaches the end of the rail, a speed detection means detects that the opening and closing of the curtain has stopped, and is equipped with an automatic curtain stop circuit that cuts off the power supplied to the motor. The electric curtain driving device according to claim 1.