JPH0739358Y2 - Spindle motor drive circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a drive circuit of a spindle motor for controlling a spindle motor of a disc player or the like.

(B) Problems to be solved by the conventional technology and device The conventional spindle motor drive circuit has the circuit diagram shown in FIG.

In the figure, reference numeral 1 is a transistor circuit of a unitized spindle motor drive unit (hereinafter simply referred to as a unit), which is composed of transistors Q10 to Q13.
2 is an input terminal for the Forward / Reverse control signal (hereinafter referred to as F / R control signal), 3 is a PWM (Pulse Width)
Modulation) signal input terminal.

Transistors Q1 to Q7 are inverter circuits that drive the above-mentioned tunnel circuit 1, transistors Q14 and Q15 are rotation speed control circuits by PWM signals, R1 to R15 are resistors, M is a spindle motor, L is a coil element, and I is a spindle motor M. When the current I flows in the direction of the arrow due to the flowing current, the spindle motor M rotates in the positive direction.

The F / R control signal is applied to the input terminal 2 and supplied to the inverter circuits Q1 and Q5 of NPN type transistors. The output signal of the inverter circuit Q1 of the NPN transistor is supplied to the transistor Q10 of the unit circuit 1 via the resistor R10, and at the same time, is supplied to the inverter circuit Q3 of the PNP transistor.

On the other hand, the output signal of the NPN transistor inverter circuit Q5 is the same as the NPN transistor inverter circuit Q5.
Inverted with a transistor inverter circuit Q6,
It is supplied to the transistor Q11 of the unit circuit 1 via the resistor R11, and at the same time, supplied to the inverter circuit Q7 of the PNP transistor.

The output signals of the inverter circuits Q3 and Q7 of the PNP type transistors are supplied to the transistors Q13 and Q12 of the unit circuit 1 via the resistors R13 and R12.

In this way, each inverter circuit is configured to control the unit circuit 1, and the spindle motor M is rotated normally / reversely by the F / R control signal.

When the F / R control signal is "Hi", the inverter circuit Q
1, Q3 is turned "ON", and the transistors Q10, Q13 of the unit circuit 1 controlled by the inverter circuits Q1, Q3 are also turned "ON".

On the other hand, the inverter circuit Q5 also turns on at the same time, but the inverter circuit Q6 turns off. Inverter circuit Q6 is "O
FF ”, the inverter circuit Q of PNP type transistor
7 is also "OFF", and transistor Q1 of unit circuit 1
1, Q12 will also be "OFF".

When the transistors Q10 and Q13 of the unit circuit 1 are turned “ON” and the transistors Q11 and Q12 are turned “OFF”, the unit circuit 1 causes the current I supplied from the + B power source to flow in the direction of the arrow as shown in the figure, and the spindle motor M performs forward rotation.

When the F / R control signal becomes "Lo", Q1 and Q3 of the inverter circuit become "OFF", and this inverter circuit Q1 and Q3
Transistors Q10 and Q1 of unit circuit 1 controlled by 3
3 is also “OFF”.

On the other hand, the inverter circuit Q5 also turns off at the same time, but the inverter circuit Q6 turns on. Since the inverter circuit Q6 is turned "ON", the inverter circuit Q7 of PNP type transistor is also turned "ON" and the transistor Q1 of the unit circuit 1
1, Q12 will also be "ON".

When the transistors Q10 and Q13 of the unit circuit 1 are “OFF” and the transistors Q11 and Q12 are “ON”, the current flowing in the unit circuit 1 flows through the transistors Q11 and Q12,
The current I flows in the direction opposite to the direction of the arrow, and the spindle motor M rotates in the reverse direction.

In this way, the spindle motor M is controlled to rotate in the forward and reverse directions by the "Hi" and "Lo" signals of the F / R control signal.

A PWM signal is applied to the input terminal 3, and the transistors Q14 and Q15 are operated by the PWM signal, and the transistors Q12 and Q13 of the unit circuit 1 are connected in series via the coil L from the emitter-coupled emitters.
The rotation speed of the spindle motor M is controlled by 5.

The rotation speed of the spindle motor M is controlled by the duty ratio of the PWM signal.

In this way, the spindle motor M is driven with its rotational direction and rotational speed controlled by the F / R control signal and the PWM signal.

However, the above-mentioned drive circuit has a large number of parts such as transistors and resistors, and has a drawback of high cost. Also
Since the F / R control signal is driving the inverter circuits Q1 and Q5 of NPN type transistor at the same time, when the F / R control signal is "Hi" (at about 5V), the load resistance becomes R / 2 and becomes small. There are drawbacks such as the need for the ability to drive the circuits Q1 and Q5.

The present invention has been made in view of the above points, and an object thereof is to provide a drive circuit for a spindle motor that solves the drawbacks of the conventional example.

(C) Means for solving the problem The drive circuit of the spindle motor of the present invention is an emitter couple circuit of a PNP type transistor and a drive unit of a spindle motor in which the spindle motor is connected to the collector of the emitter couple circuit of the NPN type transistor. In the drive circuit of the spindle motor, which is connected in series with the emitter couple of the controller and supplies the PWM signal to control the rotation speed, the first NP to which the forward / reverse rotation control signal is supplied.
An N-type transistor inverter circuit and a first PNP-type transistor inverter circuit, and a second NPN-type transistor inverter circuit to which an output signal of the first NPN-type transistor inverter circuit is supplied.
An inverter circuit of a PNP-type transistor and an inverter circuit of a second NPN-type transistor to which an output signal of the inverter circuit of the first PNP-type transistor is supplied, and one transistor of the emitter-coupled circuit of the PNP-type transistor is The output of the inverter circuit of the first NPN transistor and the other transistor are
Connect with the output of the inverter circuit of NPN type transistor,
One transistor of the emitter couple circuit of the NPN transistor is the output of the inverter circuit of the first PNP transistor, and the other transistor is the output of the second PNP transistor.
Connect with the output of the inverter circuit of PNP type transistor,
The output signals of the four inverter circuits control the emitter couple circuit of the PNP type transistor and the emitter couple circuit of the NPN type transistor.

(D) Action In the spindle motor drive circuit controlled by the F / R control signal, connect the spindle motor to the emitter couple circuit of the PNP transistor and the collector of the emitter couple circuit of the NPN transistor. One transistor Q10 of the emitter-coupled transistors Q10 and Q11 is controlled by the first NPN transistor inverter circuit Q1, and the other transistor Q11 is controlled by the second NPN transistor inverter circuit Q4.

In addition, the emitter-coupled transistors Q12 and Q13 of the above NPN type transistor also control the transistor Q12 by the inverter circuit Q2 of the first PNP type transistor, and
Inverter circuit Q3 of NP type transistor, and transistor Q1
It is configured to control 3.

When the F / R control signal is "Hi", the inverter circuit Q
1, Q3 and transistors Q10, Q13 are turned on, and the spindle motor rotates in the forward direction.

Further, when the F / R control signal is "Lo", the inverter circuits Q2, Q4 and the transistors Q11, Q12 are turned "ON", and the spindle motor operates so as to rotate in the reverse direction.

(E) Embodiment An embodiment of the drive circuit of the spindle motor according to the present invention will be described with reference to FIG.

The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 shows a drive circuit for a spindle motor. The spindle motor M is connected to the collectors of PNP transistor emitter-coupled transistors Q10 and Q11 and NPN transistor emitter-coupled transistors Q12 and Q13, as in the conventional example. There is. The transistors Q10 to Q13 are composed of a unit circuit 1, and when a current I flowing in the spindle motor M flows in the direction of the arrow as shown in the figure, the spindle motor M rotates in the forward direction and the current flows in the direction opposite to the direction of the arrow. When I flows, the spindle motor M rotates in the opposite direction.

The F / R control signal supplied to the input terminal 2 is the first
NPN transistor inverter circuit Q1 and first PNP
It is supplied to the transistor inverter circuit Q2.

The output signal of the inverter circuit Q1 of the first NPN transistor is transferred to the transistor Q of the unit circuit 1 via the resistor R10.
At the same time, it is supplied to the inverter circuit Q3 of the second PNP transistor.

The output signal of the inverter circuit Q3 of the second PNP type transistor is transmitted through the resistor R13 to the transistor Q of the unit circuit 1.
Supplied to 13.

On the other hand, the output signal of the inverter circuit Q2 of the first PNP transistor is supplied to the transistor Q12 of the unit circuit 1 via the resistor R12, and at the same time, is supplied to the inverter circuit Q4 of the second NPN transistor. .

The output signal of the inverter circuit Q4 of the second NPN transistor is supplied to the transistor Q11 of the unit circuit 1 via the resistor R11.

Thus, the inverter circuit for controlling the unit circuit 1 is composed of the first NPN transistor and PNP transistor inverter circuits Q1 and Q2 and the second PNP transistor and NPN transistor inverter circuits Q3 and Q4, and / R
The control signal controls the normal rotation and the reverse rotation of the spindle motor M.

When the F / R control signal is "Hi", the inverter circuit Q1 of the first NPN transistor is "ON",
The transistor Q10 of the unit circuit 1 controlled by the inverter circuit Q1 of NPN type transistor also turns on.

The output signal of the inverter circuit Q1 of the first NPN transistor is the inverter circuit Q3 of the second PNP transistor.
Is controlled to turn on the inverter circuit Q3 of the second PNP type transistor. When the inverter circuit Q3 of the second PNP type transistor is turned "ON", the transistor Q13 of the unit circuit 1 is turned "ON" via the resistor R13.

On the other hand, since the inverter circuit Q3 of the first PNP transistor is "OFF", the inverter circuit Q4 of the second NPN transistor is also "OFF", and the inverter circuit Q3 of the first PNP transistor and the second The transistors Q11 and Q12 of the unit circuit 1 controlled by the inverter circuit Q4 of the NPN transistor of are also turned off.

When the transistors Q10 and Q13 of the unit circuit 1 are turned “ON” and the transistors Q11 and Q12 are turned “OFF”, the unit circuit 1 causes the current I supplied from the + B power source to flow in the direction of the arrow as shown in the figure, and the spindle motor M performs forward rotation.

When the F / R control signal becomes "Lo", the inverter circuit Q1 of the first NPN transistor turns "OFF", and the transistor Q10 of the unit circuit 1 controlled by the inverter circuit Q1 of the first NPN transistor Is also "OFF".

The output signal of the inverter circuit Q1 of the first NPN transistor is the inverter circuit Q3 of the second PNP transistor.
Is controlled to turn off the inverter circuit Q3 of the second PNP type transistor. When the inverter circuit Q3 of the second PNP type transistor is turned "OFF", the transistor Q13 of the unit circuit 1 is turned "OFF" via the resistor R13.

On the other hand, since the inverter circuit Q3 of the first PNP type transistor is turned "ON", the inverter circuit Q4 of the second NPN type transistor is also turned "ON", and the inverter circuit Q3 of the first PNP type transistor and the second Also, the transistors Q11 and Q12 of the unit circuit 1 controlled by the inverter circuit Q4 of the NPN type transistor of are also "ON".

When the transistors Q10 and Q13 of the unit circuit 1 are “OFF” and the transistors Q11 and Q12 are “ON”, the current flowing in the unit circuit 1 flows through the transistors Q11 and Q12,
The current I flows in the direction opposite to the direction of the arrow, and the spindle motor M rotates in the reverse direction.

The PWM signal applied to the input terminal 3 controls the rotation speed of the spindle motor M by the transistor Q15 as in the conventional example.

In this way, the drive circuit of the spindle motor M can control the forward / reverse rotation of the spindle motor M by the F / R control signal, and can control the rotation speed by the PWM signal.

(F) Effect of the invention The drive circuit of the spindle motor according to the invention is the inverter circuit Q1 of the first NPN transistor and the second PNP transistor.
-Type transistor inverter circuit Q3 turns on transistors Q10 and Q13 of unit circuit 1 to rotate spindle motor M in the forward direction, and inverter circuit Q of the first PNP-type transistor and the second NPN-type transistor.
Since the transistors Q11 and Q12 are turned ON at 2 and Q4 and the spindle motor M is rotated in the reverse direction, the number of constituent parts is reduced, and the cost can be reduced.

Also, when the F / R control signal is "Hi", only the inverter circuit Q1 of the first NPN transistor is turned "ON", so the drive capacity of the F / R control signal is half that of the conventional example. There is also.

Also, by providing the rotation speed control separately, the number of high-speed switching type transistors is reduced, and the structure is simple and the cost is low, so it is easy to implement. There is.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a drive circuit for a spindle motor according to the present invention. FIG. 2 is a circuit diagram showing a drive circuit of a conventional spindle motor. Description of main symbols 1: Spindle motor drive unit circuit 2: F / R control signal input terminal 3: PWM signal input terminal M: Spindle motor I: Spindle motor drive current

Claims (1)

[Scope of utility model registration request] 1. A PNP transistor emitter couple circuit, a spindle motor drive unit in which a spindle motor is connected to the collector of an NPN transistor emitter couple circuit, and one emitter couple connected in series to supply a PWM signal. In the drive circuit of the spindle motor equipped with the rotation speed control circuit for controlling the rotation speed, the first NP to which the forward / reverse rotation control signal is supplied
An N-type transistor inverter circuit and a first PNP-type transistor inverter circuit, and a second NPN-type transistor inverter circuit to which an output signal of the first NPN-type transistor inverter circuit is supplied.
An inverter circuit of a PNP-type transistor and an inverter circuit of a second NPN-type transistor to which an output signal of the inverter circuit of the first PNP-type transistor is supplied, and one transistor of the emitter-coupled circuit of the PNP-type transistor is The output of the inverter circuit of the first NPN transistor and the other transistor are
Connect with the output of the inverter circuit of NPN type transistor,
One transistor of the emitter couple circuit of the NPN transistor is the output of the inverter circuit of the first PNP transistor, and the other transistor is the output of the second PNP transistor.
Connect with the output of the inverter circuit of PNP type transistor,
A drive circuit for a spindle motor, wherein output signals of the four inverter circuits control an emitter couple circuit of the PNP type transistor and an emitter couple circuit of the NPN type transistor.