JPH03212187A - Curtain driving unit - Google Patents

Abstract

PURPOSE:To start a motor quickly by producing a constant voltage from a reference voltage outputted from a switching control circuit in a converter circuit, through a Zener diode and a resistor, and employing thus produced constant voltage as the power supply for a base voltage forming circuit. CONSTITUTION:A switch SW2 is closed to close SW1 through a switching control circuit 3, and an AC voltage is rectified DB and smoothed C1 in order to drive a converter circuit 1 thus subjecting a motor M to forward/reverse rotation through switching of a relay 2. A switching control circuit 4e turns a transistor Q1 ON/OFF and outputs a reference voltage VR. The reference voltage VR is converted through a constant voltage circuit 5 into a lower voltage VZ which is then employed as the power supply for a base voltage forming circuit 4c. When a curtain is opened or closed, voltage to be fed through a capacitor C3 to an adder 4d is lowered. Output from an encoder is subjected to F/V conversion 4b and added in the adder 4d to produce a voltage V1 for energizing the control circuit 4e to to turn the Tr Q1 ON/OFF. Consequently, non-operating time of a motor is shortened at the time of starting resulting in smooth slow starting.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention automatically opens curtains in response to switch operation.
! ll! This invention relates to a curtain driving device for closing.

[Prior Art] FIG. 3 shows a conventional curtain drive device that automatically opens and closes curtains in response to switch operations. In this curtain drive 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 Pritsuno DB and a smoothing capacitor C4. is stepped down in the converter circuit 1 to create a driving power source for the motor M, and a current in the forward and reverse directions is selectively passed through the motor M through the polarity switching circuit 2 provided at the output of the converter circuit 1.
Rotate forward and reverse to open and close the curtain. Here, the converter circuit 1 is composed of a high frequency transformer T7, a transnostar Q, diodes D and D2, a coil, and a capacitor C2, and converts a DC voltage obtained by rectifying and smoothing an AC power source AC into a high frequency voltage. At the same time, this high frequency voltage is rectified and smoothed to create a driving power source. In addition, the polarity switching circuit 2 has a so-called britsuno configuration in which two sets of series circuits each consisting of two relay contacts are connected to the output of the converter circuit 1, and a motor M is connected between the connection points of the respective series-connected relay contacts. The relay contacts located at diagonal positions in the figure are grouped, and current is passed through the motor M in the forward and reverse directions by turning on and off the relay contacts in each group. The switching control of the relay contacts of the polarity switching circuit 2 is performed by the switching control circuit 3, and the input of the WRWi signal to the switching control circuit 3 is performed by operating the switch SW2. This switch SW2 can also perform an operation to stop driving the curtain, and the switching control circuit 3 opens the power switch SW1 inserted between the AC power supply AC and the diode Pritsuno DB (by doing so, The motor M is stopped by stopping the power supply to the motor M.The switch SWI is controlled by the switching I11 control circuit 3 so as to close at the same time when the 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, a constant speed control means 4 is provided to control the opening/closing speed of the curtain to be constant. This constant speed control means 4 includes an encoder 4a that detects the operating speed of the motor M corresponding to the opening/closing speed of the curtain, and an F that converts the pulse output of the encoder 4a into a voltage signal.
A V conversion circuit 4b, a base voltage generation circuit 4c that generates a base voltage for operating the motor M at a constant speed, an addition circuit 4d that adds the output of the FV converter 4b and the output of the base voltage generation circuit 4c, and this addition circuit. The so-called P controls the operating speed of the motor M by controlling the on-duty of the switching element Q of the converter circuit 1 according to the output of the converter circuit 4d.
It is composed of a WM type switching control circuit 4e. The F■ conversion circuit 4b generates a DC voltage proportional to the period of the pulse output output from the encoder 4a, and the base voltage generation circuit 4c is composed of a variable resistor R9, and the base voltage is changed depending on the setting of the variable resistor R1. This allows the voltage to be varied. In addition, in the base voltage generation circuit 4c of this curtain driving device, the reference voltage of the switching control circuit 4e is
, is used as a power source to create a base voltage, and power is supplied to the other circuits of the constant speed control means 4 from a control power supply circuit (not shown), and furthermore, the control power supply circuit receives a voltage at a later stage than the power switch SW. The reference voltage (R) of the switching control circuit 4e rises when the motor M is rotated by creating a power supply. Addition circuit 4d
is composed of an operational amplifier OP1 and resistors R5 to R4, and the output obtained by adding the respective outputs of the FV conversion circuit 4b and the base voltage generation circuit 4C using this adder circuit 4d is the output after the motor M performs a slow start operation. is a constant voltage as long as there is no change in the operating speed of the motor M. As shown in FIG. 4(a), the switching control circuit 4e has an upper limit voltage of vH1.
A device that compares the triangular wave comparison voltage Vose with a lower limit voltage vL and the output voltage V1 of the adder circuit 4a, and outputs a rectangular wave pulse that becomes high level when the comparison voltage Vose is higher than the output voltage ■1. The upper limit voltage vH of the comparison voltage VO8e is lower than the reference voltage VR.

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, by providing a slow start means in this curtain drive device, the curtain is moved slowly immediately after opening/closing operation, and the speed approaches a constant speed as time passes. Specifically, this slow start means is constituted by a capacitor C3 connected between the application end of the reference voltage VR of the variable resistor R5 and the output layer, and the voltage of the differential waveform is changed according to the rise of the reference voltage VR. It is output as the output of the base voltage generation circuit 4b.

First, the operation of the constant speed control means 4 when the curtain is in the opening/closing operation will be explained. Now, if the speed of the motor M increases while it is operating, the cycle of the pulse output of the final encoder 4a becomes shorter, and the output voltage of the FV conversion circuit 4b becomes higher, and the adder circuit The output voltage V of 4d also increases. The output voltage V of this 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 Q1 of the converter circuit 1 to be short. Therefore, the secondary output of the high frequency transformer T is reduced, the current flowing through the motor M is reduced, and the operating speed of the motor M is reduced. vice versa,
When the speed of the motor M becomes slower, the period of the pulse output of the encoder 4a becomes longer, the output voltage of the FV conversion circuit 4b decreases, and the output voltage V1 of the adder circuit 4d also decreases. The switching control circuit 4e that receives the output voltage V of the adder circuit 4d widens the pulse width of the output pulse, thereby lengthening the ON period of the switching element of the converter circuit 1, contrary to the above case. Therefore, the secondary output of the high frequency transformer T1 increases, the current flowing through the motor M increases, and the operating speed of the motor M increases.

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

Now, when you control the opening and closing of the curtain, the power switch SW1 closes, the Guiod Bridge 7 DB and the smoothing capacitor C
A DC voltage obtained by rectifying and smoothing the AC power supply AC at I is applied to the converter circuit 1. When the power switch SW is closed in this way, the reference voltage k of the switching control circuit 4e rises, and at this time, a current flows through the capacitor C, and the reference voltage k as shown in FIG. 4(a) increases. The voltage that gradually decreases from the voltage VW is the base voltage generation circuit 4C.
is output from. Note that when the power switch SW+ is turned on, the motor M is not rotating, so the output of the FV conversion circuit 4b at this time is Ov, and the output of the base voltage generation circuit 4C is directly the output of the addition circuit 4d. voltage v
It becomes l. As this output voltage V decreases as the capacitor C3 is charged, as shown in FIG. No. 41, which is at a high level when the output voltage is brighter than V. A rectangular pulse output shown in I(b) is output from the switching control circuit 4e. In other words, when the output of the switching control circuit 4e is at the level 7 to 1, the transistor Q1 of the converter circuit 1 is turned on, and at this time the 2^ frequency transistor
A secondary output is induced, and a DC voltage obtained by rectifying and smoothing this secondary output is applied to the motor M via the polarity switching circuit 2. 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 of the adder circuit 4d gradually decreases as shown in FIG. becomes long (therefore, the current supplied to the motor M increases, and the operating speed of the motor M increases. Then, when the capacitor C1 is fully charged, the output voltage of the base voltage generation circuit 4C is increased by the variable resistor R1. When the output voltage ■1 of the adding circuit 4d decreases to the voltage determined by the setting of , and the output voltage ■1 of the adding circuit 4d decreases to the voltage obtained by adding a DC voltage proportional to the operating cycle of the motor M to this voltage, the output voltage ■ becomes stable at this voltage, and from then on The motor M enters the constant speed control state described above.

[The problem that the invention seeks to solve] However, when the above curtain 1!111J [placed]
Since the reference voltage ■R of the switching control circuit 4e is used as a power source for the base voltage generation circuit 4C, the voltage input from the capacitor C1, which is a slow start means, to the addition circuit 4d at the time of starting the motor M is as shown in FIG. As shown in a), the voltage becomes considerably higher than the upper limit voltage V of the comparison voltage Vosc of the switching control circuit 4e. For this reason,
It takes a long time (1+ in FIG. 4) for the output voltage 1 of the adder circuit 4d to fall below the upper limit voltage VH of the comparison voltage V osc, and during this time L1, the output of the switching control circuit 4e is In the low level state, transistor Q,
is not turned on, and no power is supplied to motor M from converter circuit 1. Therefore, during the period t1, the motor M
The system was in a stopped state, which caused the operator to feel that the response was slow.

In addition, in this type of curtain driving device, in order to protect the component parts of the motor M and the converter circuit 1 when the motor M is locked, a protection circuit cuts off the supply of AC power AC when the motor is locked. There are some with
In a curtain drive device having such a protection circuit, if the motor M remains stopped for a long time as described above, there is a risk that the protection circuit may malfunction due to the motor being locked.

The present invention has been made in view of the above points, and an object of the present invention is to provide a curtain driving device that can quickly open and close the curtain when the curtain is opened and closed.

[Means for Solving the Problems 1] In order to achieve the above object, the present invention uses a base voltage generating circuit to generate a voltage that gradually decreases to the base voltage from a voltage equal to the upper limit voltage of the comparison voltage of the switching control circuit when starting the motor. The slow start means inputs the output to the adding circuit to gradually increase the operating speed of the motor during forward/reverse rotation control of the motor.

[Function] As described above, the present invention provides an addition circuit in which the slow start means uses a voltage that gradually decreases from a voltage equal to the upper limit voltage of the comparison voltage of the switching control circuit to the base voltage as the output of the base voltage generation circuit when starting the motor. By inputting the voltage to the voltage, the output voltage of the adder circuit when starting the motor quickly becomes lower than the comparison voltage of the switching control circuit, thereby shortening the period during which the motor does not operate.

[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, as shown in FIG.
The Zener diode ZD is not used as a power source for c, but rather regulates the reference voltage R to a voltage equal to the upper limit voltage vH of the comparison voltage Vose of the switching control circuit 4e.
A constant voltage circuit 5 consisting of a resistor R6 and a resistor R6 is provided, and the output voltage Vz of this constant voltage circuit 5 is used as a power source for the base voltage generating circuit 4c.

If the reference voltage vk is thus regulated to a voltage equal to the upper limit voltage vH of the ratio 112 voltage V osc of the switching control circuit 4e, and the voltage Vz is used as the power source of the base voltage generation circuit 4C, the voltage is The voltage input to the adder circuit 4d becomes low as shown in FIG. 2(a). Therefore, the switching control circuit 4e
The transistor Q is turned on in a time shorter than one cycle of the comparison voltage V osc (tz in FIG. 2), so that the motor M can be started quickly. When starting the motor, a voltage that gradually decreases from a voltage equal to the upper limit voltage of the comparison voltage of the switching control circuit to the base voltage is input to the adder circuit as the output of the base voltage generation circuit, and the Since the motor is equipped with slow star 1 means for gradually increasing the operating speed of the motor, the output voltage of the adder circuit quickly becomes lower than the comparison voltage of the switching control circuit when the motor is started, thereby shortening the period during which the motor does not operate. , the curtain can be quickly moved by controlling the opening and closing of the curtain. Moreover, since the motor can be started quickly in this manner, even in a curtain drive device equipped with a protection circuit against motor lock, the protection circuit will not malfunction.

[Brief Description of the Drawings] Figure #41 is a circuit diagram of an embodiment of the present invention, Figure 2 is an explanatory diagram of the same operation as above, Figure 3 is a circuit diagram of a conventional example, and Figure 4 is an explanatory diagram of the same operation as above. It is. 1 is a converter circuit, 2 is a polarity switching circuit, 3 is a switching control circuit, 4 is a constant speed control means, 4a is an encoder, 4b is F
V conversion circuit, 4c is a base voltage generation circuit, 4d is an addition circuit, 4e is a switching control circuit, 5 is a constant voltage circuit, AC
is an AC power supply, M is a motor, Ql is a ) transistor, vl is an output voltage, ■2 is a reference voltage, and V osc is a comparison voltage.

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. The driving power generating means to generate the driving power generating means, and controlling the switching of the application direction of the output of the driving power generating means to the motor according to the switch operation, and controlling the supply of the output of the driving power generating means to the motor to control forward and reverse rotation of the motor. A rotation and stop control means for performing stop control, and a 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 a switching element of the drive power generation means. an encoder that detects the operating speed of the motor; and an FV conversion circuit that converts the pulse output of the encoder into a voltage signal;
A base voltage generation circuit that creates a base voltage for operating the motor at a constant speed, an addition circuit that adds the outputs of the FV conversion circuit and the base voltage generation circuit, and a periodicity between the output voltage of the addition circuit and the upper and lower binary values. A switching control circuit that compares a comparison voltage that changes over time and generates a pulse output that becomes a high level when the comparison voltage is higher than the output voltage of the adder circuit, and controls the on-duty of the switching element with this pulse output. constitutes a constant speed control means, and when the motor is started, a voltage that gradually decreases from a voltage equal to the upper limit voltage of the comparison voltage of the switching control circuit to the base voltage is input to the adder circuit as the output of the base voltage generation circuit, and the motor A curtain drive device comprising slow start means for gradually increasing the operating speed of a motor during forward and reverse rotation control.