JPH0880091A - Motor driver - Google Patents

Abstract

PURPOSE: To provide a motor driver which has a small-sized and universal constitution and can drive a plurality of motors. CONSTITUTION: Driver circuits 10 for one channel and the first predrivers 12 for one channel and the second predrivers 14 for 0.5 channel are provided within the same motor driving IC 30, and further a logic circuit for selectively operating the first and second predrivers, according to the combination of the selection signal, is provided. This logic circuit can selectively operate the first and second predrivers 12 and 14, according to the combination of the selection signals to be supplied to selective input terminals MD0-2, IN1 and 2. Hereby, this can cope with each application without adding change to the motor drive IC itself by combining a plurality of motor drives IC's 30 or adding an external driver, according to the number of motors to be driven.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a motor drive circuit for driving a plurality of motors.

[0002]

2. Description of the Related Art Conventionally, in a drive circuit for driving a plurality of motors, the number of pre-drivers and a pair of series-connected power supply side and ground side motor drive transistors is determined according to the number of motors to be driven. , This is an IC.

For example, a motor drive IC for driving one DC motor includes a pair of serially connected power supply side and ground side motor drive transistors (driver circuits),
A predriver for supplying a predetermined control signal is provided to each control terminal of each motor drive transistor, and a bridge for one channel is configured. An output terminal of the motor drive current is drawn out from each connection point of the power supply side and ground side motor drive transistors (driver section) connected in series, and a predetermined motor drive current is drawn from this output terminal to the motor coil. Is being supplied.

A motor drive IC for driving two DC motors generally has a bridge for two channels, and a motor drive IC for driving three motors has a bridge for three channels. Is formed.

[0005]

However, in the conventional motor drive IC, since the number of bridges is determined according to the number of motors, it has already been used when the number of motors used is changed. There is a problem that it is difficult to apply the motor drive IC and the versatility of the IC is poor.

That is, I which has already driven two motors
When C is present and a request for driving the three motors is made, a new motor drive IC has to be developed to drive the three motors. Also, when using two conventional motor driving ICs, a bridge for one channel must be added as an external circuit to this driving circuit, and a substantially new motor driving IC should be developed. There was not much difference.

For example, in devices such as cameras, the number of motors to be driven differs depending on the specifications. Therefore, according to the number of motors that are conventionally driven, the motor drive IC
The number of bridges of the motor, and based on this, the motor drive IC
However, there is a problem in that it costs extra to separately develop a motor drive IC for each camera model.

When the number of motors to be driven increases, the number of output ports of the CPU for controlling the operation of each motor also increases, and the number of bridges increases, so that the motor drive IC can change according to the number of motors. There was a problem that it would become large.

In particular, in a small device such as a camera, the degree of freedom in design is low, so that the device design becomes difficult when the motor driving IC used is large. Therefore, in such a device, the motor driving IC must be small. Is required.

The present invention has been made to solve these problems, and has a compact and highly versatile structure,
An object of the present invention is to provide a motor drive device that can drive a plurality of motors.

[0011]

In order to achieve the above object, the motor drive device according to the present invention has the following features.

A driver circuit having a pair of driver portions each composed of a power supply side motor drive transistor and a ground side motor drive transistor connected in series, and a connection point between the power supply side motor drive transistor and the ground side motor drive transistor. A pair of motor drive current output terminals, a first pre-driver connected to the control terminals of the motor drive transistors to control the motor drive transistors, and a pair of auxiliary output terminals, respectively. A second pre-driver for supplying a predetermined control current from the auxiliary output terminal, and a selection input terminal to which a selection signal of a predetermined combination is input, and the first and the first depending on the combination of the selection signals. And a logic circuit for selectively operating the two pre-drivers.

For a common CPU having at least two motor drive devices and outputting the same selection input signal, the selection input terminals of one of the motor drive devices correspond to the other motor drive device. The selection input terminal and the selection input terminal are connected in different connection relations.

For a predetermined combination of the selection signals, the logic circuit of each motor drive device selectively controls the first pre-driver of its own, thereby controlling the driver circuits respectively. Currents for driving the first and second motors are supplied to the first and second motors connected to the pair of motor drive current output terminals, respectively, and other combinations of the selection signals are provided. In this case, the logic circuit of each of the motor drive devices selectively controls its own first pre-driver to control any one of its own driver units, and the controlled driver unit is controlled. The motor drive current output terminal of one of the motor drive devices corresponding to, and the other of the motor drive device corresponding to the controlled driver unit. A third motor connected to the motor drive current output terminal, current for driving the third motor from said two motor drive current output terminal, characterized in that it is supplied.

When an external driver unit is provided at the pair of auxiliary output terminals of one of the motor drive devices, for another combination of the selection signals, the one of the motor drive devices of the one of the auxiliary drive terminals is provided. The logic circuit selectively controls the first pre-driver of its own to control any one of the driver units of its own, and the logic circuit selectively controls the second pre-driver. As a result, the external driver section is controlled, and the fourth motor connected to the motor drive current output terminal corresponding to the controlled driver section and the current output terminal of the external driver section is controlled. A current for driving the fourth motor is supplied.

When the external driver section is provided at the pair of auxiliary output terminals of each of the motor drive devices, for further combinations of the selection signals, the motor drive devices of both the motor drive devices are provided. The logic circuit selectively controls the second pre-driver to control each of the external driver units, and to control the fifth motor connected to the connection output terminals of the two external driver units. A current for driving the fifth motor is supplied.

Further, the logic circuit has a pre-regulator for generating a predetermined regulated voltage by using a main power supply, and the logic circuit is responsive to a combination of the selection signals. And the pre-regulator is selectively controlled.

[0018]

According to the motor drive device of the present invention, a driver circuit for one channel, a first pre-driver for one channel and a second pre-driver for 0.5 channel are provided in the same device. Further, a logic circuit for selectively operating the first and second pre-drivers according to the combination of the selection signals is provided. The logic circuit receives the first signal according to the selection signal supplied as the combination signal.
Also, the second pre-driver can be selectively operated.

Therefore, the structure itself of the motor drive device is changed by combining a plurality of motor drive devices of the present invention or by adding an external driver unit to the device according to the number of motors to be driven. Without changing the number of motors, the range of application is wide.

Further, by making the connection relationship between the common CPU and the selection input terminal of one motor driving device and the corresponding selection input terminal of the other motor driving device different, the same CPU from the common CPU can be used. With the selection signal, it is possible to provide different selection input signals to a plurality of motor drives.

Therefore, it is possible to control a plurality of motor drive devices with a simple combination of selection signals without increasing the output ports of the common CPU.

Further, when at least two motor driving devices are provided, the logic circuit in each motor driving device operates its first pre-driver in accordance with a predetermined combination of the selection signals, so A current for driving the first and second motors connected to the pair of motor drive current output terminals can be supplied.

Further, the logic circuit of each motor drive device controls one of its own driver units in accordance with another combination of the selection signals. This allows
The third motor connected to the motor drive current output terminal of one motor drive device corresponding to this driver unit and the motor drive current output terminal of the other motor drive device corresponding to the controlled driver unit A current can be supplied to drive the third motor.

If a driver section (external motor drive transistor) is provided as an external operating circuit at the auxiliary output terminal of one motor drive device, the logic circuit controls the first pre-driver. , One of the driver units is controlled. Further, the logic circuit controls the second pre-driver to control the external driver unit. Therefore, the current for driving the fourth motor can be supplied to the fourth motor connected to the one motor drive current output terminal of the one motor drive device and the current output terminal of the external driver unit. .

When an external driver unit is connected to the auxiliary output terminal of each motor drive device, each logic circuit
The external driver unit is controlled by selectively controlling the second pre-drivers, and the fifth motor is driven by the fifth motors connected to the current output terminals of the external driver units. Can supply the current.

As described above, it is possible to cope with various numbers of motors and specifications of the device by the combination of the same motor driving device, and the versatility of the motor driving device of the present invention is extremely high.

Further, even when a plurality of motors are driven, the size of one motor drive device does not change, so that when the present invention is applied to a small device, the number of motors to drive increases. Also, it is possible to prevent the degree of freedom in device design from being impaired.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the configuration of an IC motor drive device according to an embodiment of the present invention. In FIG. 1, the driver circuit 10 has a pair of driver parts, and each driver part is configured by connecting a PNP type power source side motor drive transistor and an NPN type ground side motor drive transistor in series. . Further, from the connection point of the pair of power supply side motor drive transistor and ground side motor drive transistor, the motor drive current output terminals OUT1 and OUT1, respectively.
OUT2 is drawn out, and this output terminal OUT1,
A coil of a motor (M) according to the application is connected to OUT2.

Then, in each motor drive transistor,
The first pre-driver 12 for one channel is connected and supplies a predetermined base current to the base of each motor drive transistor that constitutes the driver circuit 10.

A second pre-driver 14 for 0.5 channels is connected to the auxiliary output terminals OUT3P and 3N. The auxiliary output terminals OUT3P and 3N have external operating circuits, for example, an external driver section for 0.5 channels (PNP type motor drive transistor Q
1 and NPN type motor drive transistor Q2) and the like are connected. Then, a predetermined control current is supplied from the second pre-driver 14 to these external operation circuits via the auxiliary output terminals OUT3P and 3N, so that this operation circuit operates.

Further, in the motor drive IC 30 of this embodiment, a predetermined regulated voltage Vcc (for example, 1.85V) is supplied from a main power source voltage VB (for example, 1.5 to 3V) such as an external battery. Pre-regulator 2 for generating
0 is provided.

This pre-regulator 20 comprises a reference voltage circuit 24 for generating a reference voltage Vref using a bandgap circuit, and a differential amplifier 22 for controlling an external regulator transistor Q3 according to the reference voltage Vref. Have

A smoothing capacitor C1 for smoothing the main power supply voltage VB whose one end is grounded is connected between the main power supply (VB) and the emitter of the external regulator transistor Q3. On the other hand, an oscillation preventing capacitor C2 is connected to the collector side of the regulator transistor Q3.

A voltage Vcont corresponding to the reference voltage Vref is supplied to one input terminal of the differential amplifier 22. The voltage Vcont is a reference voltage Vcont depending on the specifications of the device.
You can change its value based on ref. The transistor Q3 is controlled by the differential amplifier 22 supplying a predetermined base current to the base of the regulator transistor Q3 according to the voltage Vcont. Then, the smoothed main power supply voltage VB is regulated,
A prescribed regulated voltage Vcc is generated on the collector side of transistor Q3.

The other input terminal of the differential amplifier 22 is connected to the connection point between the voltage dividing resistors R1 and R2,
A voltage corresponding to the regulated voltage Vcc generated on the upstream side of the voltage dividing resistor R1 (the output side of the transistor Q3) is supplied to the other input terminal. Therefore, the regulated voltage Vcc generated on the collector side of the transistor Q3 is
The voltage becomes a voltage according to Vcont and the resistance values of the voltage dividing resistors R1 and R2.

Then, the predetermined regulated voltage Vcc
Can be used as the power supply voltage (VS) of its own driver circuit 10 or the power supply voltage of other devices.

The logic circuit composed of the motor selection logic 16 and the operation selection logic 18 has selection input terminals MD0-2, IN1 and IN2. Selection signals from a CPU (not shown) are supplied to the selection input terminals MD0-2, IN1, and 2 in a predetermined combination. Then, the logic circuit supplies an on / off signal corresponding to the combination of the selection signals to each of the pre-drivers 12 and 14 and the pre-regulator 20 to selectively control these operations.

The power supply voltage V of the driver circuit 10 in the figure
As S, the main power supply voltage VB is used instead of the regulated voltage VCC. However, this driver circuit 10
The power supply voltage VS may be either the voltage VCC or the main power supply voltage VB depending on the specifications of the motor (M) driven by the driver circuit 10.

Next, the motor drive IC 30 shown in FIG.
A configuration example when used to drive a motor of a camera or the like will be described. In the drawings described below, the same parts as those in FIG. 1 and the drawings described above are denoted by the same reference numerals and the description thereof will be omitted.

When one motor drive IC is used (one motor and external operation circuit drive: M1)
An example is shown in which one motor drive IC 30 (IC1) is used to drive a motor 1 (M1) for film winding of a camera, for example.

External operation circuits are provided at the auxiliary output terminals OUT3P and 3N. A base of an NPN power transistor is connected to the auxiliary output terminal OUT3N, and a shutter driving solenoid whose one end side is connected to a predetermined upper power source (eg, regulated voltage power source) is connected to the collector side of the transistor. It is connected in series. Further, a Zener diode for maintaining a constant voltage between the base and collector of the transistor is provided between the base and collector of the transistor. On the other hand, the cathode side of the light emitting diode is connected to the auxiliary output terminal OUT3P.

Select input terminals MD0-2, I from the CPU
The combination of the selection signals supplied to N1 and N2 is as shown in the truth table of FIG. 7 when the logic circuit is L active. Here, the truth table shown in FIG. 7 is based on the premise that a plurality of motors or external operation circuits are not operated at the same time. The logic as shown in FIG. 7 is particularly effective as a logic for a motor drive IC used in a device such as a camera that does not operate a plurality of motors and circuits at the same time.

When the motor 1 (M1) is driven, the selection input terminal MD1 is not used (not connected), and (H, L) is supplied to the selection input terminals MD0 and MD2. This allows
The motor selection logic 16 of FIG. 1 is in a selection mode of the motor 1 (M1), that is, a mode of selecting the first pre-driver 12 of FIG.

When a combination signal of H and L is supplied to the selection input terminals IN1 and IN2, the operation selection logic 18 of FIG. 1 responds to this combination and outputs the first signal corresponding to each motor drive transistor. The on / off of the pre-driver 12 is controlled. Further, in response to this, from the motor drive current output terminals OUT1 and OUT2 to the motor 1 (M1), (H,
H), (L, H), (H, L) or (L, L) is output, and the operation modes of the motor 1 (M1) are standby, forward rotation, reverse rotation or brake (short brake) in this order. Become.

From the selection input terminals MD0, 2 (H,
H) is supplied, the motor drive IC 30 is in a standby state (current = 0) to save power.

On the other hand, the selection input terminals MD0 and 2 are connected to (L,
When the selection signal of (H) is supplied, the selection mode of the external operation circuit is set, and H is supplied to the selection input terminals IN1 and IN2.
The corresponding second pre-driver 14 of FIG. 1 is selected according to the combination of L and L, and the auxiliary output terminals OUT3P, 3
The operating circuit connected to N is controlled.

Then, (H,
When L) is supplied, the shutter driving operation circuit connected to the auxiliary output terminal OUT3P is turned on to operate the shutter. When (L, H) or (L, L) is supplied to the selection input terminals IN1 and IN2, the light emitting diode connected to the auxiliary output terminal OUT3N is turned on to emit light.

(Driving Two Motors: M1, M4) In FIG. 3, the motor 1 (M1) for film winding of a camera is driven by using the driver circuit of one motor driving IC 30 (IC1). In addition, the auxiliary output terminal OUT
External drivers for 0.5 channels are connected to 3P and 3N. Then, for example, the motor 4 (M4) for the shutter is driven by the driver section formed inside the IC1 on the output terminal OUT1 side and the driver section for 0.5 channels.

The method of driving the motor 1 (M1) is the same as in FIG. Then, as shown in FIG. 7, the selection input terminal MD
When the selection signal of (L, L) is supplied to 0 and 2, the selection mode of the motor 4 (M4) is set and the selection input terminal IN
Depending on the combination of H and L supplied to 1 and 2, L or H is output from the output terminal OUT1 to the motor 4 (M4).

On the other hand, the external PNP motor drive transistor Q1 connected to the auxiliary output terminal OUT3P and the external NPN motor drive transistor Q2 connected to the auxiliary output terminal OUT3N are connected to the selection input terminal IN.
It is turned on / off depending on the combination of H and L supplied to 1 and 2. Then, from the current output terminals OUT3 'of these two motor drive transistors (external driver section),
H or L is output to the motor 4 (M4).

When the combination of outputs from the output terminal OUT1 and the connection point OUT3 'of the external driver section becomes (L, H), (H, L) or (L, L),
The operation mode of the motor 4 (M4) is forward rotation, reverse rotation, or brake (short brake) in this order. When (H, H) is supplied to the selection input terminals IN1 and IN2, the motor 4 (M4) enters the standby mode.

When a motor for driving a shutter, which requires a high rotational speed accuracy, is used as the motor 4 (M4), the drive voltage (VS) of the motor 4 is as shown in FIG. The regulated voltage Vcc, which is a voltage, is used instead of the battery power source (VB) whose output voltage is not constant. As a result, a stable constant voltage can be supplied to the motor 4, and the rotation accuracy of the motor 4 (M4) increases,
The performance of the device is improved.

When a plurality of motor drive ICs are combined Next, an example of the configuration when a plurality of motor drive ICs are used will be described.

(Driving Three Motors: M1 to M3) FIG. 4 shows an example in which two motor driving ICs (IC1 and IC2) 30 are combined to drive three motors (M1 to M3).

First, the driver circuit for one channel of one motor drive IC (IC1) drives the motor 1 (M1) for film winding of the camera, for example, and the one motor drive IC (IC2) for one channel. The driver circuit drives the shutter motor 2 (M2).

Further, each motor drive IC (IC1, IC
Each of the logic circuits of 2) selectively controls its own first pre-driver to output the output terminal OUT2.
The driver units on the side are controlled respectively. Then, for example, the motor 3 (M3) for autofocus (AF) is driven by the two controlled driver units.

Two motor drive ICs (IC1, IC2)
The same selection signal is supplied from the common CPU to the selection input terminals MD0 to 2, IN1 and IN2. However, as shown in FIG. 4, the selection input terminals MD1 and MD2 of the motor drive IC (IC1) and the selection input terminals MD2 and 1 of the motor drive IC (IC2) are connected to the same output port of the CPU. . The selection input terminals IN1 and IN2 of the motor drive IC (IC1) and the motor drive IC (IC2)
Selection input terminals IN2 and IN1 are connected to the same output port of the CPU.

Therefore, of the selection signals output from the common CPU, the selection signals of IC1 are inverted with respect to the motor selection signals related to the selection input terminals MD1 and MD2 and the operation selection signals related to the selection input terminals IN1 and IN2. The selected signal is IC
2 is configured to be supplied.

The operation of each motor (M1-3) will be described below. In the configuration shown in FIG. 4, the selection of the motor is performed using the selection input terminals MD1 and MD2.

When the motor 1 (M1) is driven, (H, L) is supplied to the selection input terminals MD1 and MD2, and the motor selection logic enters the selection mode of the motor 1 (M1) (see FIG. 7). . At this time, since (L, H) is supplied to the selection input terminals MD1 and MD2 of the motor drive IC (IC2), the motor selection logic of IC2 does not operate.

Then, the selection input terminals IN1 and IN2 of the IC1
When a combination signal of H and L is supplied to the, the operation selection logic of the IC1 responds to the first combination according to the combination.
Control the pre-driver 12. From the motor drive current output terminals OUT1 and OUT2 to the motor 1 (M1), (L, H),
When (H, L) or (L, L) is output, the motor 1
The operation mode of (M1) is forward rotation, reverse rotation, or brake (short brake) in this order. When (H, H) is supplied to the selection input terminals IN1 and IN2 of the IC1, the motor 1 (M1) is in the standby mode.

On the other hand, when the motor 2 (M2) is driven, the selection signal from the CPU is supplied as (H, L) to the selection input terminals MD1 and MD2 of the IC2 which are inversely connected. That is, (L, H) is supplied to the selection input terminals MD1 and MD2 of the IC1, whereby the IC1 does not drive the motor and the motor selection logic of the IC2 causes the motor 2 to operate.
The selection mode (M2) is set.

Further, selection input terminals IN1 and IN2 of IC2
Then, when a combination signal of H and L is supplied from the output port of the CPU, the operation selection logic of the IC 2 controls its own first pre-driver according to this combination. When (H, L), (L, H) or (L, L) is output from the motor drive current output terminals OUT1 and OUT2 to the motor 2 (M2), the operation mode of the motor 2 (M2) is changed. , In this order, forward rotation, reverse rotation, or brake (short brake) is applied, and (H,
When H) is supplied, the motor 2 (M2) enters the standby mode.

In addition, (H,
H) is supplied, two motor drive ICs 30
Is in a standby state for power saving regardless of input to the selection input terminals IN1 and IN2.

When driving the motor 3 (M3), IC
(L, L) is supplied to the first selection input terminals MD1 and MD2. As a result, the IC1 has its own motor selection logic in the selection mode for the motor 3 (M3). This selection signal is also supplied to the selection input terminals MD1 and MD2 of the IC2 as the same (L, L), so that the IC2 simultaneously has its own motor selection logic in the selection mode of the motor 3 (M3). .

Then, the selection input terminals IN1 and IN2 of the IC1
, Combined signals (H, H), (L, H), (H,
When L) or (L, L) is supplied, the operation selection logic of IC1 controls its own first pre-driver according to this combination. As a result, the driver unit on the side of the motor drive current output terminal OUT2 of the IC1 is controlled, and the output terminal OUT2 outputs H, L, L to the motor 3 (M3).
Is output.

At the same time, the selection input terminal IN of IC2
(H, H), (H, L), (L, H) or (L, L) is supplied to 1 and 2, and the operation selection logic of the IC2 operates its first pre-driver. Control. Then, the driver unit on the motor drive current output terminal OUT2 side is controlled, and the motor 3 is output from the output terminal OUT2 of the IC2.
L, H, and L are output for (M3).

Therefore, the operation mode of the motor 3 (M3) becomes standby, forward rotation, reverse rotation or brake (short brake) in this order, and operates as an AF motor.

When (L, H) is supplied to the selection input terminals MD1 and MD2 of the IC1, the IC1 enters a mode in which only the pre-regulator 20 is selectively operated. As a result, the logic circuit of IC1 controls the pre-regulator 20 to generate the regulated voltage Vcc. The regulated voltage Vcc can be supplied to the driver circuit of the IC2, for example. When the motor 2 (M2) is driven, this regulated voltage VCC is used as the drive power source (VS).
Is used, the accuracy of the rotation speed of the motor 2 (M2) is improved. Therefore, as shown in FIG. 4, as the motor 2 (M2),
When a shutter driving motor or the like is used, the performance of the device (camera or the like) is improved.

(Four Motor Drives: M1 to M4) FIG. 5 shows an example in which two motor drive ICs (IC1, IC2) 30 are used to drive four motors (M1 to M4).

First, in the configuration of FIG. 5, as in the case of FIG. 4, the motor 1 for film winding of the camera is driven by the driver circuit for one channel of one motor drive IC (IC1).
(M1) is being driven. The other motor drive IC
In (IC2), the driver circuit for one channel drives the motor 2 (M2) for AF, for example.

Further, each motor drive IC (IC1, IC
Each of the logic circuits 2) selectively controls its own first pre-driver to control the driver section on the output terminal OUT2 side, and these two driver sections control, for example, a zoom motor. 3 (M3) is being driven.

Further, the auxiliary output terminal OUT3P of IC2,
3N is provided with a driver unit for 0.5 channels similar to FIG. Then, for example, the motor 4 (M4) for the shutter is driven by the driver portion formed inside the IC 2 on the output terminal OUT1 side and the driver portion for 0.5 channels.

Two motor drive ICs (IC1 and IC2)
The selection input terminals MD0 to 2, IN1 and IN2 of each of the selection input terminals MD0 to IN2 of the common CPU are similar to those of FIG.
The connection relationship between the input terminals 1 and 2 and the selection input terminals IN1 and IN2 is inverted and connected. Therefore, of the selection signals output from the common CPU, for the motor selection signals related to the selection input terminals MD1 and MD2 and the operation selection signals related to IN1 and IN2, the selection signal obtained by inverting the selection signal of IC1 is output to IC2. Supplied.

In the case of driving the motor 1 (M1), the process shown in FIG.
As shown in (1), (H, H, L) is supplied to the selection input terminals MD0, 1, 2 of the IC1, and the motor selection logic of the IC1 becomes the selection mode of the motor 1 (M1). On this occasion,
Selection input terminals MD0, 1, of the motor drive IC (IC2)
Since (H, L, H) is supplied to 2, the motor selection logic of IC2 does not operate.

Then, select input terminals IN1 and IN2 of IC1
When a combination signal of H and L is supplied to, the operation selection logic of the IC1 controls its own first pre-driver in accordance with the combination, and the motor drive current output terminal O
From UT1, 2 to motor 1 (M1), (L, H),
(H, L) or (L, L) is output. Motor 1 (M
The operation mode of 1) is normal rotation depending on this combination.
Reverse rotation or brake (short brake). Also,
When (H, H) is supplied to the selection input terminals IN1 and IN2 of the IC1, the motor 1 (M1) enters the standby mode.

When the motor 2 (M2) is driven, IC
(H, L, H) is supplied to the selection input terminals MD0, 1, 2 of No. 1, and the motor is not driven by the IC1. on the other hand,
The selected input terminals MD0, 1, 2 of IC2 are (H, H,
L) will be supplied, and the motor selection logic of IC2 will be in the selection mode of motor 2 (M2).

Then, the selection input terminals IN1 and IN2 of the IC2
When a combination signal of H and L is supplied, the operation selection logic of the IC2 controls its own first pre-driver according to this combination. Then, from the motor drive current output terminals OUT1 and OUT2 of the IC2 to the motor 2 (M2)
Then, (H, L), (L, H) or (L, L) is output, and the operation mode of the motor 2 (M2) is forward rotation, reverse rotation or brake (short brake) in this order. When (H, H) is supplied to the selection input terminals IN1 and IN2 of the IC2, the motor 2 (M2) enters the standby mode.

Further, when the motor 3 (M3) is driven, (H, L,
L) is supplied, and similarly, selection input terminals MD0, MD0 of IC2,
(H, L, L) is also supplied to 1 and 2. This allows
The motor selection logic of each of IC1 and IC2 becomes the selection mode of the motor 3 (M3).

Then, as in FIG. 4, IC1 and IC2
When a combination signal of H and L is supplied to the selection input terminals IN1 and IN2 of
Each operation selection logic of C2 controls its own first pre-driver. Therefore, the driver unit on each output terminal OUT2 side is controlled, and the output terminals O of IC1 and IC2 are controlled.
From UT2, for motor 3 (M3), (L,
H), (H, L) or (L, L) is output. The operation mode of the motor 3 (M3) depends on this combination.
In this order, forward rotation, reverse rotation, or braking (short brake) occurs, and the motor 3 (M3) operates as a motor for AF. In addition, the selection input terminal IN of IC1 and IC2
When (H, H) is supplied to 1, 2, the motor 3 (M
3) is the standby mode.

Next, when the motor 4 (M4) is driven, (L,
L, H) are supplied, the motor is not driven in IC1, and only the pre-regulator operates. On the other hand, the selection input terminals MD0, 1, 2 of the IC2 have (L,
(H, L) is supplied, and the motor selection logic of IC2 becomes the selection mode of the motor 4 (M4).

Then, the selection input terminals IN1 and IN2 of the IC2
In the same manner as in FIG. 3, (H, H), (L, H), (H,
L) or (L, L) is supplied, the IC
The second first pre-driver and the second pre-driver are controlled,
The operation modes of the motor 4 (M4) are standby, forward rotation, reverse rotation or brake (short brake) in this order.

Incidentally, the auxiliary output terminal OUT3P of IC1
3N is provided with a predetermined operation circuit as shown in FIG.
By supplying (L, H, H) to the selection input terminals MD0, 1, 2 of 1, the motors 1 to 4 (M1 to 4) and the external operation circuit can be operated. In FIG. 5, for example, the base of an NPN transistor is connected to the auxiliary output terminal OUT3N, and the cathode of the light emitting diode is connected to the collector side of this NPN transistor. Further, the cathode of a diode for generating a predetermined constant current is connected to the auxiliary output terminal OUT3P.

(Four Motor Drives: M1 to M3, M5) FIG. 6 shows two motor drive ICs (IC1, IC2) 30.
Is used to drive four motors (M1 to M3, M5).

First, in the configuration shown in FIG. 6, as in the case of FIG. 5, the driver circuit for one channel of one motor drive IC (IC1) drives, for example, the zoom motor (M1) of the camera. The other motor drive IC
In (IC2), the driver circuit for one channel drives the motor 2 (M2) for shutter, for example.

Each motor drive IC (IC1, IC
Each logic circuit of 2) selectively drives its own first pre-driver to drive the motor 3 (M3) for AF, for example, by the driver unit on the output terminal OUT2 side.

Further, the auxiliary output terminals OUT3P and 3N of the IC1 and IC2 are provided with driver sections IC1 'and IC2' for 0.5 channels as external operation circuits, and these two driver sections IC1. ´, IC
2 ', for example, a film winding motor 5
(M5) is being driven.

Motors 1 to 3 and 5 (M1 to M3 and M5)
The selection is performed by supplying selection signals similar to those shown in FIG. 5 to the selection input terminals MD0, 1 and 2, and a predetermined motor is selected by the combination shown in FIG. The selection and driving method of the motors 1 to 3 (M1 to M3) are the same as those of the motors 1 to 3 (M1 to M in the configuration example of FIG. 5).
This is the same as the selection and driving method of 3).

When the motor 5 (M5) is driven, I
(L, H, H) is supplied to the selection input terminals MD0, 1, 2 of C1 and IC2. As a result, both IC1 and IC2 are in the selection mode of the motor 5 (M5).

Then, the selection input terminals IN1 and IN2 of the IC1
, (H, H), (L, H), (H, L) or (L,
L) is supplied, and at the same time, the selection input terminal IN of IC2
When (H, H), (H, L), (L, H) or (L, L) is supplied to 1 and 2, each logic circuit controls the respective second pre-drivers accordingly. Then, the external driver units IC1 'and IC2' are controlled. Therefore, the operation mode of the motor 5 (M5) changes depending on the selection signal.
It becomes standby, forward rotation, reverse rotation or brake (short brake).

In this way, each motor drive IC (IC1,
If the IC2) is provided with an external driver section and the driving of one motor is controlled by the two external driver sections, the performance of the motor drive transistor of the external driver section is determined by the performance of each driver circuit of its own. The performance of the motor drive transistor can be different. Therefore, for example, a motor that requires more power than other motors can be applied by driving the external driver unit, and the application range of the motor drive IC of the present embodiment can be broadened. Have.

[0093]

As described above, in the motor drive device according to the present invention, a driver circuit for one channel, a first pre-driver for one channel and a first predriver for 0.5 channel are provided in the same device. Two pre-drivers are provided, and a logic circuit for selectively operating the first and second pre-drivers according to the combination of the selection signals is provided. The logic circuit can selectively operate the first and second pre-drivers according to the selection signal supplied as the combination signal.

Therefore, when the number of motors to be driven is changed, the structure of the motor drive device itself can be obtained by combining a plurality of motor drive devices of the present invention or by adding an external driver section to the device. Can be dealt with without changing the above, and has an effect that the application range of the motor drive device is wide.

Further, by making the connection relationship between the common CPU and the selection input terminal of one motor driving device and the corresponding selection input terminal of the other motor driving device different, the same CPU from the common CPU can be used. With the select input signal, it is possible to supply different select input signals to a plurality of motor drives.

Therefore, a plurality of motor drive devices can be controlled by a simple combination of selection signals without increasing the output ports of the common CPU.

Furthermore, when at least two motor drive devices are provided, the logic circuit in each motor drive device operates its own first pre-driver in response to a predetermined combination of the selection signals, so A current for driving the first and second motors can be supplied to the first and second motors connected to the pair of motor drive current output terminals.

Further, according to another combination of the selection signals, the logic circuit of each motor drive device controls one of its own driver units. This allows
The third motor connected to the motor drive current output terminal of one motor drive device corresponding to this driver unit and the motor drive current output terminal of the other motor drive device corresponding to the controlled driver unit A current can be supplied to drive the third motor.

When an external driver section is connected to the auxiliary output terminal of one of the motor drive devices, the logic circuit controls the first pre-driver, so that any one of the driver sections of its own will operate. Controlled. Then, the logic circuit controls the second pre-driver,
The external driver unit is controlled.

Therefore, the current for driving the fourth motor is applied to the fourth motor connected to one motor drive current output terminal of one motor drive device and the current output terminal of the external driver section. Can be supplied.

At the auxiliary output terminals of both motor drives,
When the external driver unit is connected, each logic circuit selectively controls the second pre-driver to control the external driver unit, and the logic circuit is connected to the current output terminals of the external driver units. An electric current for driving the fifth motor can be supplied to the fifth motor. As described above, since the motor drive device of the present invention is extremely versatile, it is possible to cope with various numbers of motors and specifications of the device by combining the same motor drive devices.

Further, even when a plurality of motors are driven, the size of one motor drive device does not change, so that the degree of freedom in device design is impaired when the present invention is applied to a small device. Can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a motor drive device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration example when one motor drive IC 30 of FIG. 1 is used.

FIG. 3 is a diagram illustrating a configuration example in which two motors are driven by using one motor drive IC 30 shown in FIG.

FIG. 4 is a diagram illustrating a configuration example in the case of driving three motors using two motor drive ICs 30 of FIG.

5 is a diagram illustrating a configuration example when four motors are driven by using two motor drive ICs 30 of FIG. 1. FIG.

6 is a diagram illustrating a configuration example in the case of driving four motors different from FIG. 5 by using two motor drive ICs 30 of FIG.

7 is a diagram showing a truth table in the logic unit of FIG. 1. FIG.

[Description of Reference Signs] 10 driver circuit 12 first pre-driver 14 second pre-driver 16 motor selection logic 18 operation selection logic 20 pre-regulator 30 motor drive IC

Claims (6)

[Claims] 1. A driver circuit having a pair of driver units each composed of a power supply side motor drive transistor and a ground side motor drive transistor connected in series, and a driver circuit having the power supply side motor drive transistor and the ground side motor drive transistor. A pair of motor drive current output terminals drawn from a connection point, a first pre-driver connected to the control terminals of the motor drive transistors to control the motor drive transistors, and a pair of auxiliary output terminals, respectively. A second pre-driver which is connected and supplies a predetermined control current from the auxiliary output terminal; and a selection input terminal to which a selection signal of a predetermined combination is input, the first pre-driver according to the combination of the selection signals And a logic circuit for selectively operating the second pre-driver. Motor driving device. 2. The motor drive device according to claim 1, wherein at least two motor drive devices are provided, and a common CPU that outputs the same selection input signal,
A motor drive device, wherein a selection input terminal of one of the motor drive devices and a corresponding selection input terminal of the other motor drive device are connected in different connection relationships. 3. The motor drive device according to claim 2, wherein the logic circuit of each motor drive device selectively controls its own first pre-driver for a predetermined combination of the selection signals. By doing so, each of the driver circuits is controlled, and a current for driving the first and second motors is supplied to the first and second motors connected to the pair of motor drive current output terminals, respectively. The logic circuit of each of the motor drive devices selectively controls the first pre-driver of its own with respect to another combination of the selection signals supplied, so that one of the driver units of its own. One of them is controlled respectively, and the motor drive current output terminal of one of the motor drive devices corresponding to the controlled driver unit and the controlled drive unit The second motor drive current output terminal to the third motor connected to the motor drive current output terminal of the other motor drive device corresponding to the bus section.
The motor drive device is characterized in that a current for driving the motor is supplied. 4. The motor driving device according to claim 3, wherein when one of the pair of auxiliary output terminals of one of the motor driving devices is provided with an external driver unit, another combination of the selection signals is provided. In contrast, the logic circuit of the one motor drive device selectively controls the first pre-driver of its own to control any one of the driver units of its own, and the logic circuit is , The external driver unit is controlled by selectively controlling the second pre-driver, and the motor drive current output terminal corresponding to the controlled driver unit and the current of the external driver unit are controlled. A motor drive device characterized in that a current for driving the fourth motor is supplied to a fourth motor connected to the output terminal. 5. The motor drive device according to claim 3, wherein when the external driver section is provided at the pair of auxiliary output terminals of each of the motor drive devices, another combination of the selection signals is provided. The logic circuit of both of the motor drive devices is
By selectively controlling the pre-driver, each of the external driver units is controlled, and the fifth motor is connected to the fifth motor connected to the connection output terminals of the two external driver units. A motor driving device characterized in that a current for driving is supplied. 6. The motor drive device according to claim 1, further comprising a pre-regulator for generating a predetermined regulated voltage by using a main power supply, wherein the logic circuit comprises the pre-regulator. A motor drive device, which selectively controls the first pre-driver, the second pre-driver, and the pre-regulator according to a combination of selection signals.