JPS63133880A - Method and apparatus for controlling dc motor of on-vehicle automatic door - Google Patents

Abstract

PURPOSE:To improve the safety of a DC motor by connecting a Zener diode between the base and the collector of a drive transistor thereby to provide braking function at the time of opening or closing a door. CONSTITUTION:Transistors 32, 32a, 32b, 32c are connected in a bridge, and a DC motor 35 is connected between the connecting points of transistors 32, 32a and 32b, 32c. Further, resistors 40, 40a, Zener diodes 41, 41a, diodes 34, 34a are connected between the collectors and the bases of the transistors 32a, 32c. Thus, even if the rotating speed of the motor 35 is increased or decreased, the collector voltages of the transistors 32a, 32c drop or rise. Thus, the rotating speed of the motor is stabilized.

Description

[Detailed Description of the Invention] [Object of the Invention] The present invention controls the opening/closing speed suitable for automatic doors for vehicles with a minimum number of parts, and also controls automatic doors to prevent danger. This is a method and device for controlling a direct current motor for an automatic vehicle door that can be stopped instantaneously.

Traditionally, the rotation speed control methods for DC motors include PLL control, dropper method, chopper method, and PWM system. II, VTRs and CD players that require high stability due to resistance control, etc.
Automotive doors are used in copying machines, word processors, work robots, etc., but since the opening and closing time of automatic doors for vehicles is short, the number of rotations of the DC motor must be detected by sensors, etc. for heavy-duty control such as the one described above. Feed back to the control circuit and control j1
11, the number of parts increases, the cost increases, and it is unsuitable for use in adverse environments.

In addition, relays are often used in the forward and reverse circuits of DC motors, which generate sparks and arcs when the contacts open and close, causing the contacts to melt, evaporate, and relocate, causing wear and deformation, and not only making the surface rough. , contacts may weld, and power consumption is high.

Further, the forward/reverse circuit using semiconductor elements has the disadvantage that it is not provided with a brake circuit for stopping the DC motor.

The sun is about to set. The present invention solves the above-mentioned disadvantage of high cost by stabilizing rotation using transistors, Zener diodes, and resistors, reducing the number of parts, reducing costs, and improving safety by providing braking ability when opening and closing the door. It is an object of the present invention to provide a method and apparatus for controlling a DC motor of an automatic door for a vehicle, which improves the performance of the vehicle.

[Structure of the invention]

. In view of these points, the present invention for controlling the power supply is provided by connecting one end of a DC motor to the positive terminal of a DC power supply, connecting the collector of a transistor to the other end of the DC motor, and grounding the emitter of the J-transistor. A control method in which the anode of a Zener diode is set to FMVt at the base of a J-transistor, a resistor is connected to a cathode of the S-en-ener diode, and a resistor is connected to the collector of the transistor, and the first side, the third side, and the second Connect the midpoint between the first and fourth sides of the bridge circuit, where the sides face each other, to the positive pole of the DC power supply, and connect the midpoint between the second and third sides to the negative pole of the DC 2IT power supply. A reversing circuit for a DC motor in which both terminals of a DC motor are connected to the intermediate points between the first side and the second side, and the third side and the fourth side, and transistors for forward and reverse rotation of the DC motor are arranged on each side. Connect the anode of a Zener diode to the bases of the transistors on the second and third sides, and connect one end of the resistor to the cathode. The control device is connected to the midpoint of the four sides, and the midpoint between the first and fourth sides of the bridge circuit, where the first and third sides and the second and fourth sides are opposite each other, is connected to the DC power source. connect the positive and negative terminals, connect the midpoint between the second and third sides to the negative pole of the DC power supply, and connect both terminals of the DC motor to the midpoints between the first and second sides and between the third and fourth sides. The anode of the Zener diode is connected to the bases of the transistors on the second and third sides of the forward/reverse circuit of the DC motor, which has transistors for forward/reverse of the DC motor arranged on each side, and a resistor is connected to the cathode. , one end of the resistor is connected to the midpoint between the first side and the second side, and the third side and the fourth side, and a pulse generation circuit that generates a brake pulse is connected to the bases of the transistors on the second side and the third side. The present invention aims to provide a direct current motor control device for automatic doors for vehicles.

According to the present invention, with the above configuration, when the value of the resistance is increased under a constant load and a constant voltage, the collector voltage of the transistor increases, the voltage between the terminals of the DC motor decreases, and the rotational speed decreases.

Conversely, if the resistance value is decreased, the collector voltage of the transistor decreases, and the voltage between the terminals of the DC motor increases, causing the rotation speed to increase.Also, when the resistance value and voltage are constant, the load increases. The rotation speed of the DC motor decreases,
Since the current of the DC motor increases, the collector voltage of the transistor decreases, and the voltage between the terminals of the DC motor increases, so the rotation speed increases.

Conversely, when the load decreases, the rotation speed of the DC motor increases, and the current of the DC motor decreases, so the collector voltage of the transistor increases, and the voltage between the terminals of the DC motor decreases, causing the rotation speed to decrease. .

Since the feed bank is applied in this way, it can be stabilized.

Next, when an open caballus is applied to the transistor on the fourth side of the bridge circuit of the forward/reverse circuit, the transistor becomes conductive.
Current flows through one end of the DC motor connected to the midpoint between the third and fourth sides, flows through the DC motor to the rotation speed control circuit on the second side, and rotates the door in the opening direction.

Also, when a closing input pulse is applied to the transistor on the first side of the bridge circuit of the forward/reverse circuit, the transistor becomes conductive.
Current flows through one end of the DC motor connected to the midpoint between the first and second sides, flows through the DC motor to the rotation speed control circuit on the third side, and rotates the door in the closing direction.

In addition, fluctuations in the rotational speed due to changes in load, etc. are always stably controlled by the rotational speed control circuit, and when a brake pulse is applied to the bases of the transistors on the second and fourth sides of the bridge circuit, both ends of the DC motor A short circuit occurs between the terminals, and the back electromotive force of the DC motor causes the motor to rotate in the opposite direction, thereby applying the brake.

1 Blood ± Below, one embodiment of the present invention will be described based on the drawings. 1 is the entire DC motor control device, the pulse generation circuit 2
, a reset circuit 3, a constant voltage circuit 4, a buzzer and lockout circuit 5, an overcurrent protection circuit 6, and a forward/reverse circuit 7.

Next, the pulse generation circuit 2 is reset by a reset circuit 3 and a constant voltage circuit 4.
, is connected to the overcurrent protection circuit 6, and the open side 12 of the open/close switch 11 is connected to the open input terminal 13 via the fuse 9 and the ignition key 10 due to the loss of DC current B8.
A microswitch 15, which is connected to the close side 14 of the open/close switch 11 except when fully closed, is connected to the close input terminal 16, and the open pulse output terminal 17, the open pulse input terminal 18, the close pulse output terminal 19, and the close pulse input terminal 20 are connected to the close input terminal 16. , the buzzer pulse output terminal 21 and the buzzer pulse input terminal 22, the brake pulse output terminal 23 and the brake pulse input terminal 24, and the lockout pulse output terminal 25 and the lockout pulse input terminal 26 are connected.

Next, transistors 32, 32a... are connected to the first side 28, second side 29, third side 30, and fourth side 31 of the bridge circuit 27 of the forward/reverse circuit 7,
Rotation speed control circuit 3 between the base and collector of 2a and 32b
3.33a and a diode 34.34a are connected in series, the brake pulse input terminal 24 is connected to the bases of the transistors 32a and 32b, and a direct current is applied to the midpoint between the first side 28 and the second side 29 of the bridge circuit 27. Electric motor 3
5 is connected at one end, and the other end is connected to the third side 30 and the fourth side 31.
Connect to the midpoint of

A resistor 36.36 is connected between the open pulse input terminal 18, the closed pulse input terminal 20 and the base of the transistor 32.32c.
a and diodes 37 and 37a are connected in series.

The collector of a transistor 39.39a with a resistor 38.38a connected between the base and emitter is connected between the resistor 40.40a of the rotation speed control circuit 33.33a and the Zener diode 41.41a, and the pulse input terminal 18
and the closed pulse input terminal 20 is connected to the base via the resistor 42.42a.

And transistor 39 and transistor 39.39
It is connected to the emitter of a and grounded through an overcurrent detection resistor 43.

Next, the reset circuit 3 is connected to the pulse generation circuit 2, and the constant voltage circuit 4 is connected to the pulse generation circuit 2, the reset circuit 3, the buzzer and lockout circuit 5, and the overcurrent protection circuit 6. is connected to the buzzer 44 and solenoid 45, and the overcurrent protection circuit 6 is connected to the overcurrent detection resistor 43.

Next, for high-speed input signals, the microswitch 15 is connected to the base of the transistor 32b on the third side 30 of the bridge circuit 7 of the forward/reverse rotation circuit 27 via the front microswitch 46.

〔Effect of the invention〕

In short, the present invention has a direct current motor 35 in addition to the direct current power source 8.
One end of the transistor 32a is connected to the other end of the DC motor 35, and the collector of the transistor 32a is connected to the other end of the DC motor 35.
The emitter of transistor 2a is grounded, and the emitter of transistor 32a is
The anode of the zener diode 41 is connected to the base of the zener diode 41, and the resistor 4 is connected to the cathode of the zener diode 41.
0 is connected to the collector of the transistor 32a, so that fluctuations in the rotational speed due to changes in the load of the DC motor 35 can be suppressed by simply combining the transistors 32a and 32b, the Zener diode 41.41a, and the resistor 40.4Qa. The opening/closing speed of the door can be automatically controlled to match the i-mounted automatic door, and stability can be achieved.

Next, the first side 28 and the third side 30 and the second side 29 and the fourth side 3
Connect the midpoint between the first side 2 and the fourth side 31 of the bridge circuit 27, where 1 and 2230 face each other, to the positive pole of the DC power supply 8, and connect the midpoint between the second side 29 and the third side 2230 to the negative pole of the DC power supply 8. Both terminals of the DC motor 35 are connected to the intermediate points between the first side 28 and the second side 29 and between the third side 30 and the fourth side 31, and a transistor 32. for forward and reverse rotation of the DC motor 35 is connected to each side. DC motor 35 with 32a...
A Zener diode 4 is connected to the bases of the transistors 32a and 32b on the second side 29 and third side 30 of the forward/reverse circuit 7.
1. Connect the anode of 41a and connect the resistor 4 to the cathode.
0.40a is connected, and one end of the resistor 40.40a is connected to the midpoint between the first side 28 and the second side 29 and the third side 30 and the fourth side 31. Since the forward/reverse direction of the DC motor 35 used can be electrically converted, the number of parts can be reduced compared to the forward/reverse direction using mechanical relays, etc., resulting in cost reduction and high reliability. The door opening/closing speed suitable for the automatic door for vehicles is automatically controlled by the combination of the transistors 32a and 32b, the Zener diode 41.4La, and the resistor 40.40a to deal with the variation in the rotational speed caused by the variation in the load of 35. Next, the first side 28 and the third side 30 and the second side 29 and the fourth side 3
The intermediate point between the first side 28 and the fourth side 31 of the bridge circuit 27, where the terminals 1 and 1 are facing each other, is connected to the positive terminal of the DC power source 8, and the intermediate point between the second side 29 and the third side 30 is connected to the DC source 8. The terminals of the DC motor 35 are connected to the negative electrode, and both terminals of the DC motor 35 are connected to the intermediate points between the first side 28 and the second side 29 and between the third side 30 and the fourth side 31, and a transistor for forward/reverse rotation of the DC motor 35 is connected to each side. Zener diodes 41 are connected to the bases of the transistors 32a and 32b on the second side 29 and third side 30 of the forward/reverse circuit 7 of the DC motor 35 in which 32, 32a... are arranged.
．． Connect the anode of 41a and connect the resistor 40 to the cathode.
．． 40a, and connect one end of the resistor 40.40a to the first
A pulse generating circuit 2 is connected to the intermediate point between the side 28 and the second side 29 and between the third side 30 and the fourth side 31, and generates a brake pulse at the bases of the transistors 32a and 32b on the second side 29 and the third side 30. Since this is connected, the forward/reverse direction of the DC motor 35 used for the opening/closing operation of the automatic vehicle door can be electrically changed, and costs can be reduced by reducing the number of parts compared to a forward/reverse method using a mechanical relay or the like. At the same time, reliability can be increased, and by adding a circuit that applies a brake signal to the transistors 32a and 32b, in order to ensure safety when someone gets caught in the automatic door opening/closing, it is possible to By short-circuiting between the terminals, the automatic door can be stopped instantaneously when the brake is applied, and fluctuations in the rotational speed due to changes in the load of the DC motor 35 are suppressed by the transistors 32'a and 32b and the Zener diodes 41 and 41a. The combination of the resistor 40.40a and the resistor 40.40a automatically controls and stabilizes the opening/closing speed of the automatic door for automobiles, and its practical effects are enormous.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention, and FIG. 1 is a wiring diagram of a DC motor control device for a vehicle-mounted automatic door in the first, second, and third inventions according to the present invention. FIG. 2 is a basic circuit diagram in the first invention, and FIG. 3 is a circuit diagram of an embodiment of the pond in the first invention. 2 Pulse generation circuit 8 DC power supply 27 Blissage circuit 28 1st side 29 2nd side 30 3rd side 3I 4th side 32.32a... Transistor 35 DC motor 40.40a Resistor 41.41a Zener diode Fig. 2

Claims (3)

[Claims] (1) Connecting one end of a DC motor to the positive pole of a DC power supply, connecting the collector of a transistor to the other end of the DC motor, grounding the emitter of the transistor, and connecting the anode of a Zener diode to the base of the transistor; A method for controlling a direct current motor for an automatic door for a vehicle, characterized in that a resistor is connected to the cathode of the Zener diode and connected to the collector of the transistor. (2) Connect the midpoint between the first side and the fourth side of the bridge circuit, in which the first side and the third side and the second side and the fourth side face each other, to the positive electrode of the DC power supply, and Connect the midpoints of the three sides to the negative pole of the DC power supply, connect both terminals of the DC motor to the midpoints between the first and second sides, and the third and fourth sides, and connect the forward and reverse directions of the DC motor to each side. The anode of a Zener diode is connected to the bases of the transistors on the second and third sides of the forward/reverse circuit of a DC motor in which transistors are arranged, and a resistor is connected to the cathode. A direct current motor control device for an automatic vehicle door, characterized in that the device is connected to a side and an intermediate point between a third side and a fourth side. (3) Connect the midpoint between the first side and the fourth side of the bridge circuit, in which the first side and the third side and the second side and the fourth side face each other, to the positive electrode of the DC power supply, and Connect the midpoints of the three sides to the negative pole of the DC power supply, connect both terminals of the DC motor to the midpoints between the first and second sides, and the third and fourth sides, and connect the forward and reverse directions of the DC motor to each side. The anode of a Zener diode is connected to the bases of the transistors on the second and third sides of the forward/reverse circuit of a DC motor in which transistors are arranged, and a resistor is connected to the cathode. An automatic door for a vehicle, characterized in that a pulse generation circuit for generating a brake pulse is connected to a side and a midpoint between a third side and a fourth side, and a pulse generation circuit for generating a brake pulse is connected to the bases of transistors on the second and third sides. DC motor control device.