KR100392696B1 - Motor driving circuit - Google Patents

Abstract

The present invention relates to a motor driving circuit, comprising: a first transistor which is a three-terminal switching element; A first diode having an anode connected to the emitter of the first transistor and a cathode connected to the base of the first transistor; A first capacitor connected between the base of the first transistor and the collector of the first transistor; A second transistor whose collector is a three-terminal switching element connected to the collector of said first transistor; A second diode having an anode connected to the emitter of the second transistor and a cathode connected to the base of the second transistor; A second capacitor connected between the collector of the second transistor and the base of the second transistor; A third resistor, one end of which is connected to the cathode of the first diode; A second resistor, one end of which is connected to the cathode of the second diode; And an IC including a first resistor connected in parallel with the second resistor and the third resistor. The integrated circuit may be configured to provide manufacturing convenience and to eliminate the need for an additional circuit for driving a motor. It has the advantage of reducing the internal occupied space of the mounted electronics.

Description

Motor Driving Circuit {MOTOR DRIVING CIRCUIT}

The present invention relates to a motor driving circuit, and more particularly, to increase the productivity of motor-related products by manufacturing all of the driving circuit elements that perform the forward and reverse rotation of the motor as an integrated circuit (IC). It relates to a motor drive circuit.

The general motor driving circuit is composed of a plurality of switching elements to perform the forward and reverse rotation of the motor, which will be described as follows.

As shown in FIG. 1, the motor driving circuit includes a first transistor Q1, a second transistor Q2, a third transistor Q3, and a fourth transistor Q4. The emitter and the collector of the third transistor are connected to each other, and the emitter of the second transistor and the collector of the fourth transistor are connected to each other.

Here, the ground potential is supplied to the emitter of the third transistor and the emitter of the fourth transistor, respectively, and the forward / reverse rotation signal is supplied to the collector of the first transistor and the collector of the second transistor.

Therefore, when the first transistor and the fourth transistor are turned on to rotate the motor forward, the motor rotates in reverse when the second transistor and the third transistor are turned on.

The driving method of the motor will be described in detail by dividing the case of forward rotation and reverse rotation.

In the case of the forward rotation, the driving signal is applied to one end of the motor while the first transistor is turned on, and the ground potential is applied to the other end of the motor while the fourth transistor is turned on.

In the case of reverse rotation, the driving signal is applied to the other end of the motor while the second transistor is turned on, and the ground potential is applied to one end of the motor while the third transistor is turned on.

However, the conventional motor driving circuit as described above has the disadvantage that the productivity is low because the individual elements must be configured as a circuit, and the circuit configuration must be changed according to the type of the motor even when changing the design specifications of the product. There is a problem.

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-mentioned problems, and the object of the present invention is to provide a motor driving circuit whose configuration is implemented as a single integrated circuit in a motor driving circuit, thereby increasing productivity and providing design convenience of a motor-related product. have.

1 is a circuit diagram showing the configuration of a general motor drive circuit.

2 is a circuit diagram showing a configuration of a motor driving circuit according to the present invention.

Figure 3 is a circuit diagram showing an embodiment for packaging a motor drive circuit according to the present invention.

<Explanation of symbols for the main parts of the drawings>

C1: first capacitor C2: second capacitor

D1: first diode D2: second diode

T1: first transistor T2: second transistor

R1: first resistor R2: second resistor

R3: third resistor

A feature of the present invention for achieving the above object is a first transistor which is a three-terminal switching element; A first diode having an anode connected to the emitter of the first transistor and a cathode connected to the base of the first transistor; A first capacitor connected between the base of the first transistor and the collector of the first transistor; A second transistor whose collector is a three-terminal switching element connected to the collector of said first transistor; A second diode having an anode connected to the emitter of the second transistor and a cathode connected to the base of the second transistor; A second capacitor connected between the collector of the second transistor and the base of the second transistor; A third resistor, one end of which is connected to the cathode of the first diode; A second resistor, one end of which is connected to the cathode of the second diode; The present invention provides a motor driving circuit including an IC including a first resistor connected in parallel with the second resistor and the third resistor.

In a preferred embodiment, the motor driving circuit comprises: a first terminal commonly connected to the other ends of the first to third resistors to supply a predetermined level of power; A second terminal connected to the cathode of the second diode to receive a forward rotation control signal from the outside; A third terminal connected to the anode of the second diode and connected to one end of the motor; A fourth terminal connected to the anode of the first diode and connected to the other end of the motor; And a fifth terminal connected to the cathode of the first diode to receive a reverse control signal from the outside as an external pin of the IC.

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

2 is a circuit diagram showing the configuration of the motor driving circuit of the present invention, wherein the motor driving circuit includes a first transistor Q1 as a three-terminal switching element, a second transistor Q2 as a three-terminal switching element, and an anode. Is connected to the emitter of the first transistor Q1, a cathode is connected to the base of the first transistor Q1, and an anode is connected to the emitter of the second transistor Q2. The cathode is composed of a second diode D2 connected to the base of the second transistor Q2.

In the motor driving circuit having such a configuration, one end of the motor M is connected to the emitter of the first transistor Q1 and the other end of the motor M is connected to the emitter of the second transistor Q2. It is.

In the method of driving the motor, when a drive signal having a predetermined level is applied to the A terminal of the motor, and the ground potential is applied to the B terminal, the motor rotates forward, and the ground potential is applied to the A terminal of the motor. When the driving signal is applied to the B terminal, the motor rotates in reverse.

This conceptual motor driving circuit is configured as an integrated circuit, and detailed descriptions will be made below by adding components necessary for actual motor driving such as resistors and capacitors.

Example

Figure 3 is a circuit diagram showing a specific configuration of the motor driving circuit according to the present invention, the motor driving circuit of the present invention is two transistors (T1) (T2), two diodes (D1) (D2), two capacitors (C1) (C2), three resistors R1 (R2) (R3), and five terminals (a) (b) (c) (d) (e).

As shown, the first transistor T1, which is a three-terminal switching element, a cathode connected to the base of the first transistor T1, and an anode connected to the emitter of the first transistor T1. A diode D1, a third resistor R3 having one end connected to the cathode of the first diode D1, a second transistor T2 having a collector connected to the collector of the first transistor T1, and an anode A second diode D2 is provided, which is connected to the emitter of the second transistor and whose cathode is connected to the base of the second transistor.

In addition, one end of the second resistor R2 connected to the cathode of the second diode D2, the first resistor R1 connected in parallel with the second resistor and the third resistor, one end of the first resistor and And a first capacitor C1 connected between one end of the third resistor and a second capacitor C2 connected between one end of the first resistor and one end of the second resistor.

Here, the other end of the second resistor R2 and the terminal a are connected, the cathode of the second diode D2 is connected to the terminal b, and the anode of the second diode D2 is connected to the terminal c. The anode of the first diode D1 is connected to the terminal d, and the cathode of the first diode D1 is connected to the terminal e, and has an external pin shape.

An example of the actual use of the motor drive circuit of the integrated circuit type having such a configuration is as follows.

First, the motor c is connected to the terminal c and the terminal d, and one end of the third capacitor and one end of the fourth capacitor and the cathode of the third diode are connected to the terminal a, and the third and fourth capacitors are connected to each other. The other end is grounded, and a predetermined battery voltage is connected to the anode of the third diode to connect a power supply, and terminal b and terminal e apply a control signal for driving a motor.

That is, terminals c and d of the motor driving circuit are driving signal output terminals, terminals a are power supply terminals, terminals b and e are control signal input terminals, and a driving control signal is applied to the terminal b. When the ground potential is applied to the terminal e, the motor performs forward rotation. When the driving control signal is applied to the terminal e and the ground potential is applied to the terminal b, the motor performs reverse rotation.

The operation flow when the motor rotates forward and when the motor rotates reversely will be described in detail.

1) When motor rotates forward

First, when a predetermined driving control signal is input to the terminal b and a ground potential is input to the terminal e, the voltage flowing through the second resistor turns on the second transistor, and the voltage divided by the first resistor is It is fed to the terminal c through between the collector of the two transistors and the emitter.

The ground potential input to the terminal e is supplied to the other end of the motor through the first diode and the terminal d, and the motor performs forward rotation in a predetermined direction.

2) When the motor reverses

First, when a predetermined driving control signal is input through the terminal e, and the ground potential is input through the terminal b, the voltage supplied through the terminal e turns on the first transistor and the collector of the turned on first transistor. The power supplied through the first resistor flows between the emitters and is supplied to the motor through the terminal d.

The ground potential supplied to the terminal b flows to the second diode while the ground potential is applied to the motor through the terminal c while the motor performs reverse rotation.

Meanwhile, the first to third capacitors not only stabilize the signal level, but also electrically isolate the direct current supplied through the first resistor and the direct current supplied through the second resistor. The motor drive circuit is a circuit for driving a DC motor.

As described above, the motor drive circuit according to the present invention is configured in an integrated circuit type (integrated circuit type) to provide the convenience of manufacturing, and at the same time configure the configuration so that no additional circuit for driving the motor, the internal occupancy space of the mounted electronic products Has the advantage of reducing

Claims (1)

In the motor drive circuit for driving a DC motor, A first transistor which is a three-terminal switching element; A first diode having an anode connected to the emitter of the first transistor and a cathode connected to the base of the first transistor; A first capacitor connected between the base of the first transistor and the collector of the first transistor; A second transistor whose collector is a three-terminal switching element connected to the collector of said first transistor; A second diode having an anode connected to the emitter of the second transistor and a cathode connected to the base of the second transistor; A second capacitor connected between the collector of the second transistor and the base of the second transistor; A third resistor, one end of which is connected to the cathode of the first diode; A second resistor, one end of which is connected to the cathode of the second diode; An IC including a first resistor connected in parallel with the second resistor and a third resistor, A first terminal commonly connected to the other ends of the first to third resistors to supply power of a predetermined level; A second terminal connected to the cathode of the second diode to receive a forward rotation control signal from the outside; A third terminal connected to the anode of the second diode and connected to one end of the motor; A fourth terminal connected to the anode of the first diode and connected to the other end of the motor; And a fifth terminal connected to the cathode of the first diode and receiving a reverse rotation control signal from the outside as an external pin of the IC.