JPH01300491A - Bubble memory device driving method - Google Patents

Abstract

PURPOSE:To prevent voltage fluctuation at the time of starting a bubble memory operation from occurring by preventing the fluctuation of a load at the time of starting the bubble memory operation from occurring by supplying the load in advance on a power source before starting the bubble memory operation. CONSTITUTION:In a bubble memory device in the inside of which the driving power source of the bubble memory device 13 is provided, voltage drop at the time of starting the operation of the bubble memory device 13 can be prevented from occurring by supplying the load on the driving power source 11 transiently at the time of starting the operation of the bubble memory device 13. Therefore, the fluctuation of an output voltage is generated before starting the operation of the bubble memory device 13, and it is already stabilized when the operation of the bubble memory device is started. In such a way, it is possible to eliminate the fluctuation of the load at the time of starting the operation of the bubble memory device 13, and to prevent the voltage fluctuation at that time from occurring.

Description

[Detailed Description of the Invention] [4 Required] A method for driving a bubble memory device that supplies a stable voltage at the start of operation of the bubble memory device, by eliminating load fluctuations at the start of operation of the bubble memory device. In order to eliminate voltage fluctuations at that time, the device is configured to temporarily apply a load to the drive power supply before the bubble memory device starts operating, thereby preventing a voltage drop when the bubble memory device starts operating.

[Industrial application field]

The present invention relates to a method for supplying a stable voltage at the start of operation of a bubble memory device in a bubble memory device having a drive power source for the bubble memory device inside.

[Conventional technology]

Bubble memory devices are non-volatile magnetic memories in which the bubble-like magnetic domains used as information move when an external magnetic field is applied, so they do not require mechanical moving parts, therefore do not require maintenance, and are free from vibration.・It has the characteristics of being resistant to impact, dust, etc.

Normally, as a means for this information transfer, two orthogonal coils and a power source are prepared, a switch circuit is installed between these coils and the power source, and a magnetic field is generated by periodically flowing current. However, the magnitude of this magnetic field fluctuates with fluctuations in the power supply voltage, and on the other hand, the range of the magnetic field for stable operation of the bubble memory device is limited, so it is necessary to suppress fluctuations in the power supply voltage.

By the way, a switching regulator is used as this power supply because of its advantages such as small size and high efficiency, but this switching regulator has the disadvantage of poor response to sudden load changes, and when the bubble memory drive starts. Voltage drops occur due to sudden load fluctuations.

Fig. 5 shows a conventional bubble memory drive device, in which 1 is a switching regulator, 2 is a switch circuit called a coil driver, 3 is a bubble memory device, and 4.5 is two orthogonal coinopes for generating a rotating magnetic field. 6 is the switching part of the switching regulator, 7
8 is a smoothing section, and 8 is a control section. 8 detects fluctuations in the output voltage and stabilizes the output voltage by changing the switching duty of the switching section 6. Normally, the change from 8 to 6. There is a time delay in the feedhack system, and there is no problem when the load current is steady, but when the load fluctuates, the output voltage fluctuates due to this response delay.

Therefore, when the bubble memory device is driven, voltage fluctuations occur at the start of driving as shown in FIG. 6 due to load fluctuations. Here, 9 is the load current of the power supply, which is almost no load when the bubble memory is not in operation, and normally ranges from several 100m8 to several A when it is in operation. Further, 10 is an output voltage waveform.

In order to suppress this voltage drop, there is a problem in that the smoothing circuit 7 must be made larger.

[Problem to be solved by the invention]

The present invention has been made to solve this problem, and its purpose is to apply a load to the power supply in advance before bubble memory operation, and to eliminate load fluctuations at the start of bubble memory operation. The purpose is to eliminate voltage fluctuations.

[Means to solve the problem]

FIG. 1 shows the basic configuration of an apparatus for carrying out the method of the present invention, in which 11 is a switching regulator, 12 is a switching regulator, and 12 is a switching regulator;
is a coil driver, 13 is a bubble memory device, 14
is the load circuit.

The operating state at this time is shown in FIG. 15 is a current flowing through the load circuit, 16 is a current due to bubble memory drive, and 17 is a sum of the multiple currents 15 and 16, which collectively constitutes a load on the power supply. 18 is output voltage fluctuation.

[For production]

According to the above configuration, fluctuations in the output voltage occur before the bubble memory operation (before time t), and the output voltage is already stable at the start of the bubble memory operation (at time t).

〔Example〕

FIG. 3 illustrates a specific configuration of an apparatus for carrying out the method of the present invention, in which 19 is a switching regulator, 20 is a switching regulator;
is a coil driver, 21 is a flip-flop, 22 is F
ET, 23 is the load resistance.

24 is a gate protection resistor of the FET, 25 is a flip-flop clear terminal, to which the drive timing signal 25 of the coil driver is connected, 26 is a flip-flop data signal fixed at a high level, 27 is a clock signal,
It maintains a low level from when a command is given from the host system until the end of the command, and 28 is the Q output of the flip-flop.

Moreover, the operating state at this time is shown in FIG.
．． 27 and 28 show the signals supplied to the above flip-flops and their Q outputs. The FET 22 is turned on only when the Q output 28 is at a high level,
A current 29 flows through the load resistor 23.

28 is cleared by the coil drive timing signal 25 at the start of device drive, but at that time, the coil current flows to the device as shown at 30, so the load current to the power supply (switching regulator) 19 becomes as shown at 31, and therefore, The output voltage fluctuation occurs before the bubble memory operation starts (at time t).

) and is stable at the start of operation.

After the baffle memory controller receives a command from the host system until it generates a coil drive signal, there is always internal processing time in the controller, so the voltage is stable. Further, the load resistor 23 must be selected so that the load current 29 and the coil current 30 are approximately equal in magnitude.

〔Effect of the invention〕

According to the present invention, it is possible to easily prevent a voltage drop at the start of operation of a bubble memory device without providing a particularly large smoothing circuit in the switching regulator.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of an apparatus for carrying out the method of the present invention, FIG. 2 is a timing diagram showing the operation of the apparatus shown in FIG. 1, and FIG. 3 is a block diagram of the apparatus shown in FIG. 1. A circuit diagram illustrating a specific configuration; (7) FIG. 4 is a timing diagram showing the operation of the device shown in FIG. 3; FIG. 5 is a diagram illustrating a conventional bubble memory drive device; The figure is a timing diagram showing the operation of the device in Figure 5. (Explanation of symbols) 1.11...Switching regulator (power supply section)
, 2. 12... Coil driver, 3.13... Bubble memory section, 14... Load circuit, 21... Flip-flop, 23... Load resistor.

Claims (1)

[Claims] 1. A method for driving a bubble memory device, characterized in that a voltage drop at the start of operation of the bubble memory device is prevented by temporarily applying a load to the drive power supply before the bubble memory device starts operating.