JPH03212188A - Curtain driving unit - Google Patents

Abstract

PURPOSE:To perform predetermined open/close operation of a curtain reliably after a predetermined time by providing means for blocking restart of operation through a switch before the predetermined elapses after stoppage of a motor for opening/closing the curtain. CONSTITUTION:A switch SW2 is turned ON to produce a signal S3 for outputting a signal V10 from a switching control circuit 3 and closing a switch SW1. An AC voltage is rectified DB and smoothed C1 to produce a DC voltage Vb, which is then provided to a converter circuit 1 in order to switch 2 the polarity of an output voltage Vc and subjecting a motor M to forward/reverse rotation. A speed control circuit 4 is controlled by a rotational speed signal fed from an encoder 4a to energize a switching control circuit 4e so as to control an output voltage Vc. Upon turn OFF of the switch SW2, a timer 7 is initiated and a signal S4 is outputted upon time up. Logical sum 10a or 10b of a switch SW2 open signal S1 or close signal S2 and the signal S4 is provided to the switching control circuit 3. Since the timer 7 times up after stoppage of the motor M, following open/close operation is carried out smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a curtain drive device that automatically opens and closes curtains in response to switch operations.

[Prior Art J] Figure 3 shows a conventional curtain drive device that automatically opens and closes curtains in response to switch operations. In this curtain driving device, the automatic opening and closing of the curtain is performed by a motor (including a linear motor) built into the curtain rail, and a DC voltage obtained by rectifying and smoothing AC power supply AC with a diode BRITSUNO DB and a smoothing capacitor C1. Vb is stepped down by converter circuit 1 to create drive power supply Vc for motor M,
A polarity switching circuit 2 provided at the output of the converter circuit 1 switches the current in the forward and reverse directions to the motor M to rotate the motor M in the forward and reverse directions, thereby driving the curtain to open and close. Here, as the converter circuit 181, an alternating current power source AC
The DC voltage vb obtained by rectifying and smoothing is converted into a high frequency voltage, and this high frequency voltage is rectified and smoothed to obtain a drive power supply Vc.
Use the one that creates the . In addition, the polarity switching circuit 2 connects two series circuits each consisting of two relay contacts to the output of the converter circuit 1, and connects the motor M to each of the series-connected relay contacts, the α connection, and the α connection. It has a so-called bristle configuration, in which relay contacts located at diagonal positions in the figure are grouped, and current is caused to flow in the forward and reverse directions through the motor M by turning on and off the relay contacts in each group. Switching control of the relay contacts of this polarity switching circuit 2 is performed by a switching control circuit 3, and an opening/closing signal is input to the switching control circuit 3 by operating a switch SW2. This switch SW2 can also perform an operation to stop driving the curtain, and at this time, the switching control circuit 3 is connected to the power switch SW inserted between the AC power supply AC and the diode BRITSUNO DB.
By opening 1, the supply of power to the motor M is stopped and the motor M is stopped.

Note that this switch SW1 is controlled by the switching control circuit 3 so that it closes simultaneously when an open/close signal from the switch SW2 is input.

By the way, in this type of curtain drive device, it is not preferable that the opening/closing speed of the curtain be influenced by fluctuations in the weight of the curtain or the power supply voltage, so the curtain must be opened/closed at a constant speed. Therefore, in the circuit shown in FIG. 3, constant speed control means is provided to control the opening and closing speed of the curtain to be constant. This constant speed control means includes an encoder 4a that detects the operating speed of the motor M corresponding to the opening/closing speed of the curtain, an F conversion circuit 4b that converts the pulse output of the encoder 4a into a voltage signal, and a constant speed operation of the motor M. A base voltage generation circuit 4c that generates a base voltage for , and an adder circuit 4d that adds the output of the FV'1i converter 4b and the output of the base voltage generator 4c, and the converter circuit 1 according to the output of the adder circuit 4d. The so-called P controls the operating speed of the motor M by controlling the on-duty of the switching element Q1.
It is composed of a WM type switching control circuit 4e. Note that power is supplied to each circuit constituting the constant speed control means from a control power supply circuit 6, and this control power supply circuit 6 is composed of a transistor 11 Zener diode ZD shown in FIG.
, and resistors R, , R, and creates a control power supply Vec by making the DC voltage vb obtained by rectifying and smoothing the AC power supply AC into a constant voltage.

FIG. 6 shows a specific circuit of the constant speed control means, in which a waveform shaping circuit 11 that shapes the waveform of the output of the encoder 4a and a DC voltage conversion circuit 12 that converts the output of this waveform shaping circuit 11 into a DC voltage perform FV conversion. This constitutes the circuit 4b. Here, the waveform rectifier circuit 11 outputs the pulse output ■ shown in the fourth eK(e) output from the encoder 4a. The DC voltage conversion circuit 12 is composed of a transistor Q1, a capacitor C+, and resistors R5, R, and the waveform shaping circuit 11
When the transistor Q, which is turned on and off by the output of the transistor Q, is turned on, the capacitor C3 is charged, and a voltage proportional to the period of the pulse output vG of the encoder 4a is generated across the capacitor C1. The base voltage generation circuit 4c includes resistors R7 and R11.
The voltage divided by the resistors R, , R, is applied to the motor M
This is the base voltage that operates at maximum speed. Addition circuit 4d
is composed of an operational amplifier OP and resistors R0° to RI3. The switching control circuit 4e includes, for example, a triangular wave comparison voltage that periodically changes into upper and lower binary voltages, and an addition circuit 4.
d is compared with the output voltage V, and outputs a rectangular wave pulse that becomes high level when the comparison voltage is higher than the output voltage V.

Furthermore, if the opening/closing speed of the curtain is controlled to be constant as described above, the curtain moves rapidly when opening/closing the curtain, which may cause discomfort to the operator. Therefore, in this curtain driving device, by providing a slow star 1 means, the curtain is moved slowly immediately after opening/closing operation, and the speed approaches a constant speed as time passes. This slow start means is composed of a series circuit of a capacitor C2 and a resistor R9 connected in parallel to the resistor R7 of the base voltage generating circuit 4c, and when the motor M is started, the control power supply circuit 4
The base voltage generation circuit 4 generates the voltage of the differential waveform according to the rise of
Output from b.

First, the operation of the constant speed control means 4 when the curtain is in the opening/closing operation will be explained. Now, when the motor M is operating and the speed of the motor M becomes faster, the cycle of the pulse output of the encoder 4a becomes shorter, and the output voltage of the FV conversion circuit 4b becomes quotient, and the The output voltage V of the circuit 4d is also high (the output voltage V of the adder circuit 4d).

In response to this, the switching control circuit 4e narrows the pulse width of the output pulse to control the ON period of the switching element of the converter circuit 1 to be short. For this reason, converter circuit 1
The output of the motor M decreases, the current flowing through the motor M decreases, and the operating speed of the motor M decreases. Conversely, when the speed of the motor M becomes slower, the cycle of the pulse output of the encoder 4a becomes longer, the output voltage of the FV conversion circuit 4b decreases, and the output voltage 2 of the adder circuit 4d also decreases. This addition circuit 4
In the switching control circuit 4e receiving the output voltage V of d, the pulse width of the output pulse is widened, and the ON period of the switching element of the converter circuit 1 is lengthened, contrary to the above case. Therefore, the output of the converter circuit 1 increases, the current flowing through the motor M increases, and the operating speed of the motor M increases. In this way, the operating speed of the motor M is controlled to be constant by the constant speed control means, and the opening/closing speed of the curtain is made constant.

Next, the operation of the slow start means will be explained.

When the operation to open and close the curtain is performed using the switch SW2, the power switch SW1 is closed, and the DC voltage obtained by rectifying and smoothing the AC power supply AC by the diode bridge DB and the smoothing capacitor C8 becomes as shown in Fig. 4 (,). applied to the converter circuit 1. When the power switch SW1 is closed in this way, the control power supply Vce is supplied from the control power supply circuit 6 to the constant speed control means as shown in FIG. 4(b), so that the current flows through the capacitor C2. flows, and as shown in FIG. 4(e), a voltage that gradually decreases from the voltage of the control power supply Vec is output as the output of the base voltage generation circuit 4c. Note that when this power switch SW is turned on, the motor M is not yet rotating, so the F
The output of the V conversion circuit 4b is Ov, and the output of this base voltage generation circuit 4c is directly transferred to the addition circuit 4 shown in #44 diagram (f).
The output voltage of d is V. When this output voltage (3) decreases as shown in FIG. 7(e) as the capacitor C2 is charged, and becomes lower than the upper limit voltage Vs of the comparison voltage of the switching control circuit 4e, the comparison voltage becomes the output voltage V3. The switching control circuit 4e outputs a rectangular output that becomes high level when the voltage is higher than . That is, when the output of the switching control circuit 4e is at a high level, the switching element of the converter circuit 1 is turned on, an output of the converter circuit 1 is generated, and the output of the converter circuit 1 is outputted to the motor M via the polarity switching circuit 2.
is applied to Therefore, the motor M is driven in either the open or close direction depending on the current direction. The pulse width of the output of the switching control circuit 4e becomes wider as the output voltage V3 of the adding circuit 4d gradually decreases as shown in FIG. 4(f), and the on-period M of the switching element of the converter circuit 1 increases. becomes longer, the current supplied to the motor M increases,
The operating speed of motor M increases. And capacitor C2
When is completely charged, the output voltage ■2 of the base voltage generation circuit 4o becomes the voltage determined by the resistors R,,R, and reaches the voltage obtained by adding the DC voltage V1 proportional to the operating cycle of the motor M to this voltage. When the output voltage ■ of the adder circuit 4d decreases,
At this voltage, the output voltage (2) becomes stable, and thereafter the motor M enters the above-mentioned constant speed control state.

Note that this curtain drive device uses a motor M that stops rotating when the curtain is completely opened or closed even when power is supplied. Since the pulse signal is no longer output from the output of the encoder 4a, an automatic stop means is provided to detect that the pulse output is no longer detected from the encoder 4a and automatically stop the supply of power to the motor M. It is. This automatic stop means is composed of an encoder 4a, two timers 8 and 9 capable of retrying, and a switching control circuit 3.

The timer 9 starts the time-limiting operation when the output V1 of the timer 8 falls. Here, the time limit of the timer 8 is set to be longer than the cycle of the pulse output V0 of the encoder 4a when the motor M is rotating at the lowest speed, so as long as the motor M is rotating, the timer 8 The output (6) is kept at a high level as shown in FIG. 7(b). Then, when the rotation of the motor M stops and the time limit of the timer 8 has elapsed, the output ■,
becomes low level. At this time, the time limit operation of the ζ timer 9 is started, and the output V becomes high level for a certain period of time as shown in FIG. 7(c). Upon receiving the high level output Vg of the timer circuit 9, the switching control circuit 3 determines that the curtain has been completely opened and closed and the rotation of the motor M has stopped, and opens the power switch SW to supply AC power. stop. Therefore, the supply of the 1L source to the motor M is automatically stopped.

[Problem to be solved by the invention] Diode pre-7 DB in the curtain driving device
The DC voltage vb obtained by rectifying and smoothing with the smoothing capacitor C4 is 140cm, and the voltage of the control power supply Vcc created by making this DC voltage constant in the control power supply circuit 6 is 5.
~15V. Therefore, even if the power switch SW1 is opened to cut off the supply of the AC power supply AC, unless the DC voltage vb drops to the voltage of the control power supply Vec, the voltage drop of the control power supply Vcc will not start, and the power switch SW1
It will take time for the control power supply Vcc to drop to OV after the control power supply Vcc is opened. Therefore, for example, if the curtain is opened or closed immediately after it is stopped (before the voltage of the control power supply Vce drops), the operation will start from a state where the capacitor C2 that constitutes the slow start means is not discharged at all. For this reason, there was a problem in that the curtain would suddenly open and close without a slow start.

Moreover, since a relatively large capacitance is used as the capacitor C2 constituting the slow start means and the capacitor C of the FV conversion circuit 4b, for example, the capacitor C
If the curtain is opened/closed before the charge of No. 2 is discharged into light, a similar phenomenon may occur unless the slow start described above is applied. Furthermore, if the curtain is opened or closed before the charge in the capacitor C1 of the FV conversion circuit 4b is not sufficiently discharged, the capacitor C1
An output obtained by adding the output voltage of the reference voltage generation circuit 4C to the voltage of 1 is output from the addition circuit 4d, and the output voltage 3 of the addition circuit 4d becomes abnormally high, and it takes time for the curtain to start moving. .

The present invention has been made in view of the above-mentioned points, and its purpose is to ensure that when the curtain is stopped and then controlled to open and close again, the curtain operates reliably in a predetermined manner. Moreover, it is an object of the present invention to provide a curtain driving device in which it does not take time for the curtain to move.

[Means for Solving the Problems 1] In order to achieve the above object, the present invention provides a restart prevention means for preventing the switch from restarting the motor for a certain period of time after the motor has stopped.

[Function] By providing the restart prevention means as described above, the present invention allows the slow start means and the FV conversion circuit to be used within a certain period of time during which the switch prevents the motor from restarting after the motor has stopped. Even if the capacitor's charge is sufficiently discharged and the curtain is opened/closed after the curtain has stopped, it will take a long time for the curtain to operate reliably as specified and for the curtain to move. This is to ensure that there are no errors.

[Example 1 An embodiment of the present invention is shown in FIGS. 1 and 2. FIG.

The basic configuration of this embodiment is the same as that explained in the section of the prior art, so in the following explanation, only the features of this embodiment will be explained.

In this embodiment, the switch S is used for a certain period after the motor M stops.
A restart prevention means is provided to prevent restart of the motor M by W2, and this restart prevention means is used to measure a certain period of time from the time when the power switch SWl is opened by the switching control circuit 3, as shown in FIG. and a curtain opening signal S input from the output of timer 7 and switch SW2.
AND circuit 10 which takes AND of each of 1 and the close signal S2.
a.

10b.

The operation of this embodiment will be explained below. Now, for example, a stop signal S for stopping the opening/closing operation of the curtain is generated by operating the switch SW2 at time 1 in FIG. If the input is , then the output of the switching control circuit 3 is . becomes low level as shown in Fig. 2 (,). As a result, the power switch SWl is opened, the supply of power to the motor M is stopped, and the opening/closing operation of the curtain is stopped. The timer 7 starts its time-limited operation when the output of the switching control circuit 3 falls by 1°, and at the end of the time-limited operation period T2, the output S of the timer 7 is at a low level, as shown in FIG. 2(b). become. Therefore, the AND circuits 10m and 10b cause the open signal S to be activated by the switch SW2.
, and input of the close signal S2 to the switching control circuit 3 is blocked. When the time limit of the timer 7 expires, the opening/closing signals S2, S2 can be input to the switching control circuit 3, and the operation thereafter is the same as described above. Here, the time limit T2 of the timer 7 is set to 7.0, which is a time period during which the capacitor CI of the constant speed control means 4 and the capacitor C2 of the slow start means are sufficiently discharged. If the above settings are made, even if the curtain opening/closing control is performed again after the curtain has been stopped, a slow start will not occur or it will not take a long time for the curtain to start moving.

[Effects of the Invention] As described above, the present invention is provided with restart prevention means that prevents the switch from restarting the motor for a certain period of time after the motor has stopped, so that the switch cannot restart the motor after the motor has stopped. Within a certain period of time during which startup is prevented, the charges in the capacitors included in the slow start means and the FV conversion circuit can be sufficiently discharged, and even if the curtain is controlled to open and close after the curtain has been stopped, The predetermined operation can be performed quickly and reliably.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is an explanatory diagram of the same operation as above, Fig. 3 is a circuit diagram of a conventional example, Fig. 4 is an explanatory diagram of the same as the above, and Fig. 5 is a drive power source. A specific circuit diagram of the circuit, FIG. 6 is a specific circuit diagram of the constant speed control means, and FIG. #S7 is an explanatory diagram of the operation of the automatic stop means. 1 is a humbatterer circuit, 2 is a polarity switching circuit, 3 is a switching control circuit, 4a is an encoder, 4b is an FV conversion circuit, 4C is a base voltage generation circuit, 4d is an addition circuit, 4e is a switching control circuit, 6 is a control power supply circuit , 7 is a timer, ioa,
lOb is an AND circuit, AC is an alternating current power supply, and M is a motor.

Claims (1)

[Claims] (1) A motor drives the curtain to open and close, and a DC voltage obtained by rectifying and smoothing an AC power source is converted into a high-frequency voltage by turning on and off a switching element, and this high-frequency voltage is rectified and smoothed to provide a driving power source for the motor. Controls the supply of AC power by controlling the direction of application of the output of the driving power generating means to the motor and controlling the opening/closing of the power switch according to the switch operation, and controls the forward/reverse rotation of the motor. Rotation and stop control means for performing stop control;
constant speed control means for controlling the operating speed of the motor to a constant level by detecting the operating speed of the motor and controlling the on-duty of the switching element of the drive power generation means; and a direct current voltage obtained by rectifying and smoothing the alternating current power source. a control power supply circuit that generates a control power source for the constant speed control means from the encoder, an encoder that detects the operating speed of the motor, an FV conversion circuit that converts the pulse output of the encoder into a voltage signal, and operates the motor at a constant speed. a base voltage generation circuit that generates a base voltage for the purpose, an addition circuit that adds the outputs of the FV conversion circuit and the base voltage generation circuit, and a comparison voltage that periodically changes to the output voltage of the addition circuit and upper and lower binary values. and a switching control circuit that generates a pulse output that becomes high level when the comparison voltage is higher than the output voltage of the adding circuit, and controls the on-duty of the switching element with this pulse output, and a constant speed control means. When the motor is started, the voltage that gradually drops to the base voltage from a voltage higher than the upper limit voltage of the comparison voltage of the switching control circuit is input to the adder circuit as the output of the base voltage generation circuit, and when the motor is controlled for forward/reverse rotation. A curtain driving device equipped with a slow start means for gradually increasing the operating speed of the motor, the curtain driving device comprising restart prevention means for preventing the switch from restarting the motor for a certain period of time after the motor has stopped.