JPH0340265A - Floppy disk device - Google Patents

Abstract

PURPOSE:To reduce a current at the time of activation by providing a power supply switching circuit to switch a power source for activation and a power source for normal operation when a spindle motor is activated. CONSTITUTION:A power source 2 for normal operation and a power source 3 for activation are provided for driving a spindle motor 1. A power source switching circuit 4 is controlled by a drive select signal B from a host system. Then, at the time of the activation, a power supply voltage is supplied from the power source 3 for activation to the spindle motor 1 and in normal operation, a power supply voltage is supplied from the power source 2 for normal operation. The spindle motor 1 executes operation under the control of a motor turning-ON signal to be inputted from the host system. Thus, the power supply voltage to be supplied to the power source 3 for activation is made lower than the power supply voltage to be supplied to the power source 2 for normal operation. Thus, the current is suppressed to be small at the time of the activation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floppy disk device, and more particularly to a floppy disk device operated by a spindle motor.

[Conventional technology]

FIG. 2 is a block diagram showing an example of a conventional floppy disk device.

In a conventional floppy disk device, as shown in FIG. 2, a power supply voltage is supplied to a spindle motor 11 from a power source 2 for normal operation, and operation is performed under control of a motor-on signal A.

The conventional floppy disk device, as shown in Figure 2,
- Since the power supply voltage of the spindle motor is supplied at a value suitable for normal operation, the current flowing during startup is large.

[Problem to be solved by the invention]

The above-described conventional floppy disk device has the drawback that the power supply voltage for the spindle motor is supplied at a value suitable for normal operation, so that the current at startup is too large.

[Means to solve the problem]

The floppy disk device of the present invention includes a spindle motor that operates by being supplied with a power supply voltage, a startup power supply that supplies a power supply voltage during startup of the spindle motor, and a power supply voltage that supplies a power supply voltage during normal operation of the spindle motor. a power source for normal operation, and a power supply switch for switching a power supply voltage to be supplied to the connected spindle motor between the power source for startup and the power source for normal operation based on a drive select signal input from a host system; It is configured to include a circuit.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a floppy disk device of the present invention.

As shown in FIG. 1, the floppy disk device of this embodiment has a power source 2 for normal operation and a power source 3 for startup for driving a spindle motor 1.

The floppy disk device of this embodiment controls the power supply switching circuit 4 in response to the drive select signal B from the host system, so that the power supply voltage from the startup power supply 3 is applied to the spindle motor 1 at the time of startup. During normal operation, the power supply voltage from the normal operation power supply 2 is supplied.

Therefore, the spindle motor 1 operates under the control of a motor-on signal input from the host system.

Note that in the floppy disk device of this embodiment, the power supply voltage supplied by the startup power supply 3 is lower than the power supply voltage supplied by the normal operation power supply 2, so that the current at startup can be kept small. can.

〔Effect of the invention〕

As described above, the floppy disk device of the present invention has the effect of significantly reducing the current required during startup by having the power supply switching circuit and the startup power supply.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a floppy disk device of the present invention, and FIG. 2 is a block diagram showing an example of a conventional floppy disk device. 1.11... spindle motor, 2. 2...Power supply for normal operation, 3...Power supply for startup, 4...Power switching circuit, A...Motor on signal, B...Drive select signal.

Claims (1)

[Claims] A spindle motor that operates by being supplied with a power supply voltage, a startup power supply that supplies a power supply voltage during startup of the spindle motor, and a normal operation power supply that supplies a power supply voltage during normal operation of the spindle motor. and a power supply switching circuit that switches the power supply voltage supplied to the connected spindle motor between the startup power supply and the normal operation power supply in response to a drive select signal input from a host system. floppy disk device.