JPH0381484A - Controller for opening/closing of window - Google Patents

Abstract

PURPOSE:To simplify the constitution of a controller for opening/closing of a window at reduced cost and also prevent malfunction caused by a rush current at the starting of the controller by providing a d.c. motor, a main circuit, an auxiliary circuit, a resistance circuit, first and second transistors, first and second resistances and a capacitor. CONSTITUTION:When excess current flows through a motor M2 as a window is fully open or closed, the voltage drop of a first resistance R1 is increased and the base voltage of a first transistor TR1 is lowered so that the transistor TR1 is turned on. Since the front stage of the second resistance R of an auxiliary circuit 3 has high electric potential, the base voltage of a second transistor TR2 is raised and the transistor TR2 is turned off to cause current from power source to almost flow through the auxiliary circuit 3 to disable current supply to the motor M1. At the starting of the circuit a discharge current from a capacitor C1 is added to a current from the power source and the rash current of the power source is reduced by the amount shared by the capacitor C1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a window opening/closing control device. For more details,
The present invention relates to a control device for a window opening/closing mechanism that uses a motor to open and close windows of vehicles such as automobiles or buildings.

[Prior art] Japanese Patent Application Laid-Open No. 63-51584 as a conventional window opening/closing control device
There are some things that are not listed in the publication. As shown in FIG. 5, this device includes a motor (61) and a motor drive circuit (65).
>, overload detection circuit (B6), and signal holding circuit (B8)
and a judgment circuit (69), and an overload detection circuit (8B
) is an operational amplifier (68a) that compares the detected voltage with the reference voltage.
), and the signal holding circuit (88) is constructed using a flip-flop (68e). In this device, when an overcurrent flows through the motor (61), it is detected by the overload detection circuit (6B) and the signal holding circuit (B
8>, an overload signal is sent to the determination circuit (69) and the drive circuit (B5) is cut off. However, even though the window is fully open or fully closed, the operation switch (6
7) is turned ON due to an erroneous operation, overcurrent is prevented from flowing to the motor (61).

[Problems to be Solved by the Invention] However, in the conventional device, the overload detection circuit (B6)
Since the signal holding circuit (8B) requires an operational amplifier (Ha) and a flip-flop (88e), the device becomes expensive.

Moreover, since the rush current to the motor (61) at the time of startup is large, the overload detection circuit (66) is activated at the time of startup, which may cause a malfunction in which the drive circuit (85>) is cut off.

In view of the above circumstances, it is an object of the present invention to provide an opening/closing control device that has a simple configuration of an electric circuit section and that does not malfunction due to inrush current at startup.

[Means for Solving the Problems] A window opening/closing control device of the present invention comprises: (a DC motor for opening and closing a bay window; <b> a main circuit connecting the motor to a DC power supply; and (c) a main circuit connected to the main circuit). , an auxiliary circuit connected in parallel with the motor; (19) a first transistor interposed in the auxiliary circuit; (r) a second transistor interposed in the main circuit; (r) a second transistor interposed in the main circuit; A second resistor is provided in the circuit; and (h) a capacitor is provided in the main circuit in parallel with the motor and discharges the charging current when the motor is started.

[Function] In the present invention, when the window is fully open or fully closed and an overcurrent flows to the motor, the voltage drop across the first resistor increases, the base voltage of the first transistor decreases, and the first transistor Turn on. On the other hand, since the potential at the front stage of the second resistor of the auxiliary circuit is high, the base voltage of the second transistor increases and the second transistor is turned off. As a result of the above, most of the current from the power supply flows through the auxiliary circuit and is not supplied to the motor, thereby preventing accidents such as burnout of the motor due to overcurrent.

Further, in the present invention, at startup, the discharge current from the capacitor is additionally supplied to the current from the power supply, so that the inrush current of the power supply can be reduced by the burden of the capacitor.

Therefore, the inrush current at startup is sufficiently lower than the overcurrent when the window is fully closed/opened, and there is no malfunction such as turning on the first transistor and flowing current from the power supply to the auxiliary circuit when starting the motor. .

[Example code] Next, the present invention will be explained in detail.

FIG. 1 is an electric circuit diagram of a switching control device according to Embodiment 1 of the present invention, FIG. 2 is a graph showing voltage-current characteristics in Embodiment 1, and FIG. 3 is a switching control according to Embodiment 2 of the present invention. The electrical circuit diagram of the device, FIG. 4, is a graph showing voltage-current characteristics in Example 2.

Example 1 ′! In the jS1 diagram, Ml is a DC motor for opening and closing the window,
Sl is an operation switch that has three positions: a forward rotation position, a reverse rotation position, and a neutral position. (1) is a main circuit connected to a DC type [12V]. A first resistor R1 and a second transistor TR2 are connected in series to this main circuit (1). In addition, a resistor R3 and a resistor R4 are connected in parallel with the second transistor TR2.
A resistor circuit (2) in which the resistors are connected in series is connected to the main circuit (1). The main circuit (1) is connected to an auxiliary circuit (1) by shunting between the base and emitter of the second transistor TR2.
3) is connected, and a first transistor TRI and a second resistor R2 are connected in series to this auxiliary circuit (3). The base of the second transistor TR2 is connected to the front stage of the second resistor R2, and the base of the second transistor TR2 is connected to the front stage of the second resistor R2.
The base of RI is after the first resistor R1 (after the resistor R3)
It is connected to the.

C1 is a capacitor, which is connected to the main circuit (1) in parallel with the operation switch S1.

In the above electric circuit, the first transistor TRI controls the energization of the auxiliary circuit (3), and the second transistor TR2
is for controlling energization of the main circuit (1). Also the first
The resistor R1 detects overcurrent in the main circuit (1) and controls the base voltage of the first transistor TR1, and the second resistor R2 detects energization in the auxiliary circuit (3) and controls the base voltage of the second transistor TR2. It controls the voltage. The resistor R3 and the resistor R4 determine the drooping characteristics of the main circuit (1).

The drooping characteristic of the main circuit (1) is a factor that determines when to cut off the overcurrent to the motor, and determines the control operation in the present invention.

The resistance values of the resistors R1, R3, and R4 are determined, for example, as follows.

The first resistor R1 must enter the droop region with less current than the overcurrent when the window is fully open or fully closed (that is, during overload). That is, in FIG. 2, if the symbol C indicates the overcurrent during overload, and the symbol a indicates the current value during steady operation, then the first transistor TR is at the position indicated by the symbol A.
I must be turned ON. Therefore, TI'il
If the voltage between 13 and 8 to
(7) DC resistance"), and if the electric current 1 voltage is 12V and the DC resistance of motor M1 is 10Ω, then R1-(1,5X0.7Xl0) +120J75
(Ω). The starting current of the drooping characteristic in this case is 0.7+0.875-0.8 (A).

Resistors R3 and R4 determine the recovery voltage from foldback, so for example, if recovery is performed at 5V, 12-s =
7 (V) is resistance I? 3. The voltage across R4 becomes, and at this time, the resistance value of the first resistor R1 is very small, so if ignored, R8:
R4-0,7; (7-0,7), and if the resistance R3 is 100 (Ω), then R4-(7-0,7) X 1
00 + 0.7-900 (Ω>).

Therefore, the value of each resistor R1%R3, R4 is 0.
．． They are 875 (Ω), 100 (Ω), and 900 (Ω).

Next, the control operation of the above control device will be explained.

(During normal operation) When the window is not opening or closing, that is, when the operation switch S
When L is in the neutral position, a current is flowing through the second transistor TR2 between B-8 through the first resistor R1 and the second resistor R2, so it is in the ON state and a collector current is caused to flow. Therefore, capacitor C1 is charged to approximately the power supply voltage.

When the operation switch St is turned to the forward or reverse rotation position to open or close the window, power is supplied to the motor M1 from the main circuit (1) via the second transistor TR2, so the motor ML rotates in the forward or reverse direction. to start. At this time of startup, the charge is also discharged from the capacitor CI and supplied to the motor Ml, so that the inrush current of the power supply can be reduced by the amount borne by the capacitor C1. This capacitor C
The burden of the starting current of t is the burden of the first transistor T, which will be described later.
Its purpose is to prevent the RI from malfunctioning. In other words, when the motor starts, normally a current 5 to 6 times the rated value flows as a starting current, so it may turn on in the same way as when an overcurrent flows during an overload, but as mentioned above, the inrush current By suppressing , it is possible to prevent the first transistor TRI from turning on.

When the motor 141 enters a steady operating state after starting, the motor 141 rotates forward or reverse until the operation switch 81 is switched to the neutral position, and then the window opens and closes.

(When the window is fully open or fully closed) When the window is lowered or raised and fully opened or closed, the motor M1 stops. At this time, the operation switch S1 is
However, if the control device is left in the forward or reverse rotation position, the control device operates as follows.

That is, since the motor M1 is not rotating, no back electromotive force is generated, and only the DC resistance of the internal windings of the motor serves as a resistance, resulting in a low resistance and a significant increase in the current supplied to the motor M1. In other words, an overcurrent flows.

If an overcurrent flows in the main circuit (1) in this way, the first
The voltage drop across resistor R1 increases and the first transistor TR
Since the B-E type pressure of I increases, the first transistor T
RI is turned ON (position indicated by symbol f in FIG. 2).

As a result, f! The current from the source now flows through the auxiliary circuit (3), namely the first transistor TRI and the second resistor R2 (in FIG. ). At this time, the potential at the front stage of the second resistor R2 is high, so the base potential of the second transistor TR2 rises,
Since the B-E threshold potential becomes smaller, the second transistor TR
2 is OFF. As a result, only a small amount of current is supplied to the motor ML through the resistor circuit (2) resistors R3 and R4. This prevents accidents such as burnout of the motor M1.

Note that when the operation switch Sl is not operated to the neutral position or to the opposite side, a very small amount of current, indicated by the symbol e in FIG. 2, continues to be supplied to the motor 141 during that time.

In the above state, when the operating switch S1 is operated so that the window moves in the opposite direction, the motor starts, and the window is moved in the opposite direction from the fully open or fully closed state, and is released from the hanging portion.

Note that when switching the operation switch S1 as described above, -
It passes through the instantaneous neutral position, but at this time, the capacitor Ct is
Resistor R1, [? 3. Charged to the power supply voltage by the current flowing through R4. Then, the charged capacitor C1 is discharged when restarting after switching the operation switch S, and the motor M
It bears part of the starting current of 1.

Example 2 In the tJa diagram, DI is a Zener diode and TR
3 is a field effect type third transistor, and cl is a capacitor. A capacitor C1 is connected in parallel to the operation switch S1.A Zener diode DI and a resistor R5 are connected in parallel to the two capacitors C1 in the main circuit (1). The Zener diode D1 is in the opposite direction to the capacitor C1. Third transistor TI? 3
The gate is connected to the rear stage of the resistor R5, the source is connected to the main circuit (1), and the drain is connected to the base of the first transistor TRI. The rest of the configuration is the same as that of the first embodiment, and the same parts are given the same reference numerals and the description thereof will be omitted.

The control operation of the control device is as follows.

(During normal operation) If the operation switch Sl is now in the neutral position, no current flows through the resistor R5 because the voltage of the capacitor C1 is still low and the Zener diode DI is in the opposite direction.

Therefore, the voltage between S and 0 of transistor TR3 is zero, and capacitor C1 is connected to ID5 of transistor TR3.
S (current that can flow between D and 8 when the voltage between G and 8 of the field effect transistor is zero). Charging of capacitor CI progresses and Zener diode Di
When the voltage rises above the breakdown voltage of , current flows through the Zener diode DI, and the voltage drop across the resistor R5 reduces the drain current of the transistor TR3. transistor TR3
When the drain current of decreases, the first transistor TRI is turned off and the second transistor Tf? '2 turns on and rapidly charges capacitor C2 to near the power supply voltage. This completes the preparation for starting the old motor.

When the operation switch 81 is turned to the forward rotation position or the reverse rotation position, the capacitor C1 and the second transistor TR2
The method for starting the motor M1 with the collector current is the same as in the first embodiment.

(When the window is fully open or fully closed) Furthermore, the current supplied to the motor is limited as follows when the window is fully open or fully closed.

When the motor M1 stops, the current supplied to the old motor increases significantly, an overcurrent begins to flow into the main circuit (1), and the voltage drop across the first resistor R1 turns on the first transistor TRI.
(point g in Figure 4). The subsequent operation is similar to Example 1, and the current from [[ begins to flow through the auxiliary circuit (3), that is, the first transistor TRI and the m2 resistor R2. At this time, the potential at the front stage of the second resistor R2 is high, so the base potential of the second transistor TR2 rises, and the potential between BE and E becomes small, so the second
Transistor TR2 is turned off. As a result, in the old motor, the resistor R3 of the resistor circuit (2) and the transistor TR3
Only a small amount of current will be supplied through the

This prevents accidents such as burnout of the old motor. Note that when the operation switch S1 is not operated either to the neutral position or to the opposite side, a very small amount of current, indicated by the symbol e in Figure i14, continues to be supplied to the motor.

In the above state, when the operating switch S1 is operated so that the window moves in the opposite direction, the motor starts, and the window is moved in the opposite direction from the fully open or fully closed state, and is released from the hanging portion.

In addition, when switching the operation switch s1 as described above, -
It passes through the instantaneous neutral position, but at this time, the capacitor CI is
As explained in the section during normal operation, the resistors R1, R3,
The current passing through the third transistor TR3 and the second transistor TR2 charges up to the power supply voltage. Then, the charged capacitor C1 is discharged at the time of restart after switching the operation switch Sl, and bears part of the starting current of the motor Ml.

(-Temporal overload) In this embodiment, if the window opening/closing mechanism is temporarily overloaded due to getting caught in a foreign object, for example, the rotation speed of the motor M1 decreases, and the terminal voltage at the motor elbow decreases. However, only when it drops to point g shown in FIG. 4 does the third transistor TR:3><ON, m1 transistor 9
Turn on RI as well. Therefore, if a foreign object is removed or the rotation of the old motor increases while the terminal voltage of the old motor decreases to point g, the current to the motor M1 will not be cut off, and the current will automatically continue to flow. There is an advantage that normal operation can be resumed and window opening/closing operations can be continued.

[Effects of the Invention] According to the present invention, it is possible to provide an opening/closing control device that has a simple and inexpensive circuit structure and is less likely to malfunction due to rush current at startup.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram of a switching control device according to Embodiment 1 of the present invention, Fig. 2 is a graph showing voltage-current characteristics in Embodiment 1, and Fig. 3 is a switching control according to Embodiment 2 of the present invention. The electrical circuit diagram of the device, FIG. 4 shows the voltage in Example 2.
A graph showing current characteristics, FIG. 5, is an electric circuit diagram of a conventional switching control device. (1): Main circuit (3): Auxiliary circuit (Ml): Motor (TRI): First transistor (TR2):: I2 transistor (R1):
First resistor (R2): Second resistor (c1): Capacitor (TR3): Third transistor

Claims (1)

[Claims] 1 (a) a DC motor for opening and closing a window; (b) a main circuit that connects the motor to a DC power source; (c) an auxiliary circuit connected to the main circuit in parallel with the motor; (d) a first transistor interposed in the auxiliary circuit; (e) a first transistor interposed in the main circuit that detects an overcurrent in the main circuit and controls a base voltage of the first transistor; (f) a second transistor interposed in the main circuit; (g) a second transistor interposed in the auxiliary circuit that detects energization of the auxiliary circuit and controls the base voltage of the second transistor; A window opening/closing control device comprising: a resistor; and (h) a capacitor that is interposed in the main circuit in parallel with the motor and discharges a charging current when the motor is started.