KR20020002780A - Driving apparatus for a motor - Google Patents

Abstract

PURPOSE: A motor driver is provided to solve a heat generation problem of a field effect transistor by preventing an over-current generated in the field effect transistor by a simple circuit design. CONSTITUTION: A motor(12) receives a power selectively supplied from field effect transistors(FET1,FET2,FET3,FET4), and perform a reversible rotation. The first over-current removing part(14) includes a zener diode(ZD1), and discharges an over-current generated between a gate of the field effect transistor(FET1) and a positive terminal of the motor(12) to a ground through resistors(R1,R2). The second over-current removing part(18) includes a zener diode(ZD2), and discharges an over-current generated between a gate of the field effect transistor(FET2) and a negative terminal of the motor(12) to the ground through resistors(R3,R4). The third over-current removing part(20) allows a zener diode(ZD3) and a diode(D1) to be connected in series, and discharges an over-current generated between a gate of the field effect transistor(FET3) and the plus terminal of the motor(12) to the ground through resistors(R5,R6). The fourth over-current removing part(16) allows a zener diode(ZD4) and a diode(D2) to be connected in series, and discharges an over-current generated between a gate of the field effect transistor(FET4) and the minus terminal of the motor(12) to the ground through resistors(R7,R8).

Description

DRIVING APPARATUS FOR A MOTOR

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for a motor, and more particularly to a driving device for stably driving a motor and preventing overcurrent generated when driving the motor by a simple circuit design.

1 is a circuit diagram showing an embodiment of a driving apparatus of a conventional motor, and includes resistors R, R1, R2, R3, R4, R5, R6, R7, and R8, and a field effect transistor (FET) (FET1). , FET2, FET3, FET4), and motor 2.

In the figure, the motor 2 rotates forward / reversely by receiving a power supply Vcc selectively provided from the field effect transistors FET1, FET2, FET3, and FET4.

For example, when the positive rotation plus voltage switching signal MOT_positive + is applied to the gate of the field effect transistor FET1 through the resistors R1 and R2, the field effect transistor FET1 switches. The power supply Vcc is applied to the plus terminal MOT + of the motor 2. When the forward rotation minus voltage switching signal MOT_positive is applied through the resistors R7 and R8 to the gate of the field effect transistor FET4, the field effect transistor FET4 is switched to operate the motor 2. Connect negative terminal of MOT- to ground (GND) through resistor (R). Therefore, the motor 2 rotates forward by receiving the power supply Vcc normally. At this time, the field effect transistors FET2 and FET3 are turned off.

On the other hand, when the reverse rotation plus voltage switching signal (MOT_reverse +) is applied through the resistors R3 and R4 to the gate of the field effect transistor FET2, the field effect transistor FET2 switches to operate the power source Vcc. It is applied to the negative terminal (MOT-) of (2). When the reverse rotation negative voltage switching signal (MOT_reverse-) is applied through the resistors R5 and R6 to the gate of the field effect transistor FET3, the field effect transistor FET3 switches to act as a positive terminal of the motor 2. Connect (MOT +) to ground (GND) via resistor (R). Therefore, the motor 2 reversely receives the power supply Vcc. At this time, the field effect transistors FET1 and FET4 are turned off.

However, in this conventional technique, when the rotation of the motor 2 is switched from positive to reverse or from reverse to positive, an overcurrent occurs instantaneously in the field effect transistors FET1 and FET2, and thus the field effect transistors FET1 and FET2. ) May be damaged by heat. In addition, even when the motor 2 normally rotates forward and reverse, overcurrent may occur in the field effect transistors FET3 and FET4, and the field effect transistors FET3 and FET4 may be damaged due to heat. In particular, heat sinks for dissipating heat generated in the field effect transistors FET3 and FET4 should be provided.

Accordingly, the present invention has been made to solve the above-mentioned drawbacks of the prior art, and it is possible to prevent overcurrent generated in the power supply field effect transistor during the forward / reverse driving of the motor by a simple circuit design, thereby generating heat in the field effect transistor. The purpose is to provide a driving device of the motor to solve the problem.

According to an aspect of the present invention, there is provided a driving apparatus of a motor having respective switching units for respectively switching to apply power to the motor in a forward / reverse direction such that a predetermined motor rotates forward / reversely. It characterized in that it comprises a respective over-current removing unit for removing each of the over-current generated in the switching unit.

1 is a circuit diagram showing an embodiment of a conventional device for driving a motor;

Figure 2 is a circuit diagram showing an embodiment of a drive device for a motor according to the present invention.

<Description of the code | symbol about the principal part of drawing>

12: motor

14, 18, 20, and 16: first, second, third, fourth overcurrent removing unit

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a circuit diagram showing an embodiment of a driving apparatus of a motor according to the present invention, and includes resistors R, R1, R2, R3, R4, R5, R6, R7, and R8, and field effect transistors FET1, FET2, and FET3. , FET4), motor 12, and first, second, third, and fourth overcurrent removers 14, 18, 20, and 16. The same reference numerals are used for the same configuration.

In the same figure, it is the same as that of FIG. 1 in which the motor 12 rotates forward / reversely by receiving the power supply Vcc selectively provided from the field effect transistors FET1, FET2, FET3, and FET4.

The first overcurrent remover 14 is composed of a zener diode ZD1 to ground the overcurrent generated between the gate of the field effect transistor FET1 and the positive terminal MOT + of the motor 12 through the resistors R1 and R2. Spill to (GND). The rated voltage of the zener diode ZD1 should be equal to the voltage between the gate and the source of the field effect transistor FET1.

The second overcurrent remover 18 is composed of a zener diode ZD2 to receive an overcurrent generated between the gate of the field effect transistor FET2 and the negative terminal MOT- of the motor 12 through the resistors R3 and R4. Drain to ground (GND). The rated voltage of the zener diode ZD2 should be equal to the voltage between the gate and the source of the field effect transistor FET2.

The third overcurrent remover 20 is configured to connect the zener diode ZD3 and the diode D1 in series so that an overcurrent generated between the gate of the field effect transistor FET3 and the positive terminal MOT + of the motor 12 is a resistor R5. , R6) to ground (GND).

The fourth overcurrent remover 16 is connected to the zener diode ZD4 and the diode D2 in series so that the overcurrent generated between the gate of the field effect transistor FET4 and the negative terminal MOT- of the motor 12 is a resistor ( R7, R8) to ground (GND).

As described above, according to the present invention, first, second, third, and third currents of the overcurrent generated in the field effect transistors FET1, FET2, FET3, and FET4 for power supply during the forward / reverse driving of the motor 12, respectively. The overcurrent removal units 14, 18, 20, and 16 prevent the heat generation problems of the field effect transistors FET1, FET2, FET3, and FET4, respectively. Therefore, the lifespan of the field effect transistors FET1, FET2, FET3, and FET4 is long, and the motor 12 is stably driven.

Claims (3)

In the driving device of the motor having a respective switching unit for switching each to apply the power to the motor in the forward / reverse direction so that the predetermined motor is rotated forward / reverse: And a respective overcurrent removing unit for removing the overcurrent generated in each of the switching units, respectively. The method of claim 1, The switching unit is configured of a field effect transistor, the driving device of the motor, characterized in that for switching between the source and the drain in accordance with the signal provided to the gate of the field effect transistor. The method of claim 2, The overcurrent removing unit is connected between a gate of each field effect transistor and a power input terminal of the motor to remove an overcurrent generated between the gate of each field effect transistor and a power input terminal of the motor. .