JPS594785B2 - Matrix selection type magnetic bubble drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a storage device using a magnetic bubble element, and particularly to a matrix-selective magnetic bubble and drive device that generates a rotating magnetic field for moving the magnetic bubble.

Various known magnetic bubble drive devices that generate a rotating magnetic field have been devised in the past.

This type of device is roughly divided into two types, direct drive method and resonance drive method, depending on the method of the circuit that drives the coil.The direct drive method has been used since the time when magnetic bubbles were invented. The coil is directly driven by a current source or voltage source drive circuit.Therefore, in this method,
Although it has the advantage that the drive frequency can be easily changed, it has the disadvantage that the power consumption in the drive circuit becomes significantly large. The resonance type drive system is disclosed in Japanese Patent Application Laid-Open No. 48-14234, 4.
8-21438, 49-84141, 49-90056
and 50-3542, etc., a capacitor is added to the coil to form a resonant circuit to reduce power consumption in the drive circuit, and depending on how the resonant circuit is driven, It is divided into series resonant drive method and parallel resonant drive method. However, in each of the above examples, one drive circuit and one switch circuit for turning on and off the coil current are required for each coil.

Therefore, when a storage device is constructed by combining a plurality of coils, the number of circuits becomes twice as large as the number of coils, which increases the cost of the device. In order to reduce the number of circuits, a matrix configuration used for selection circuits in core memories etc. can be incorporated into the magnetic bubble drive device.

An example of a method of arranging coils in a matrix and selectively driving them is disclosed in Japanese Patent Application Laid-Open No. 48-14231.
An example of the case where series resonant drive is performed is described. However, the former method has the disadvantage that the power consumption of the drive circuit is large because it is directly driven.

The latter includes one drive circuit and two or more switch circuits composed of transistors etc. in the series resonant circuit, so the quality factor Q of the resonant circuit is This has the drawback of increasing waveform distortion and circuit loss. An object of the present invention is to reduce the cost of a magnetic bubble device by configuring coils in a matrix and reducing the number of drive circuits and switch circuits. The object of the present invention is to provide a magnetic bubble drive device that does not cause distortion of current waveforms or increase in circuit loss.

That is, the present invention provides a magnetic bubble 1 drive device comprising a plurality of coils that generate a rotating magnetic field for driving a magnetic bubble element, in which the plurality of coils are arranged in a matrix, and each row has all the coils in each row. A drive common line 36 is provided which is commonly connected to the first terminal of the coil, and each drive common line is provided with a parallel resonance capacitor 32, a means for discharging the charge of this capacitor, and a drive circuit 33 capable of selective operation. directly connected, and each row has a second coil of all coils in each row.
A pair of switch common lines 37 and 38 are provided which are commonly connected to the terminals via a diode pair 35, and a switch circuit 34 capable of selective operation is connected to each switch common line, and the first drive circuit and the switch circuit are connected to each other. This is a matrix selection type magnetic bubble drive device in which the coils at the intersection of the selected drive common line and the switch common line are made to resonate in parallel by selecting .

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows a conventional magnetic bubble drive device using a parallel resonance type 1 drive system. A coil 11 containing a magnetic bubble chip therein and a capacitor 12 form a parallel resonant circuit with respect to a drive circuit 13. The coil current is turned off and on by a switch circuit 14. A pair of diodes 15 connected between the coil 11 and the switch circuit 14 so that the directions are opposite to each other is to prevent current from flowing in the opposite direction to the transistor used in the switch circuit 14. FIG. 2 shows a magnetic bubble drive device that selectively drives m coils 21, which is an extension of the conventional drive device.

Note that the m coils 21 refer to coils 21-1 to 21-m. This expression may also be applied to other things. The capacitor 22 forms a parallel resonant circuit with one selected coil, and the drive circuit 23 excites this resonant circuit. The coil 21 is selected by closing any one of the m switch circuits 24. Coils connected to other related switch circuits are not selected, so no current flows through the coils and they do not become a load on the drive circuit 23. The m diode pairs 25 are provided to prevent reverse current from flowing through the transistors used in the switch circuit 24, as described above. Therefore, if we focus on the selected coil, the device shown in FIG.
It becomes equivalent to the device shown in the figure. However, since the device shown in FIG. 2 does not have a matrix configuration, the number of circuits required is approximately the same as the number of coils. There have been no reports yet of an example in which this parallel resonant drive system is extended to a matrix configuration in order to reduce the number of circuits. FIG. 3 shows a first embodiment of a matrix selective magnetic bubble drive device according to the present invention.

A matrix configuration is constructed by arranging n sets of the devices shown in FIG. 2 to share a switch circuit and adding a means for discharging the charge of the capacitor. Therefore, the number of circuits is 2 of the square root of the number of tenon coils.
This is even more reduced than the device shown in FIG. 2. m coils, for example, coil 31-1,1 to coil 31-
1 and m form a first coil group, and a matrix of n rows and m columns is formed by n groups of such coil groups.
One resonance capacitor 32-1 to 32-n is connected to each drive common line 36-1 to 36-n in each row. One drive circuit 33-1 to 33-n is connected to each drive common line 36-1 to 36-n in each row. The switch circuits 34-1 to 34m connected to the paired switch common lines 37-1 to 37-m and the switch common lines 38-1 to 38-m have diode pairs 35-1, 1 to 35 in the coils of each column. -N, m.
The role of the diode pair 35 is as described above. The n resistors 39-1 to 39-n are means for discharging the electric charge of the capacitor 32, and are used to prevent current from flowing through unselected coils. Here, as an example of the operation, a case where the coils 31-2, 1 are selected and driven will be described. First, the charges of the capacitors 32-1 to 32-n are . It is assumed that the voltage is set to zero by the resistors 36-1 to 36-n prior to selection. Next, the drive circuit 33-2 is selected and operated, giving an initial charge to the capacitor 32-2, and charging the initial voltage of the capacitor 32-2 to +V (or -V) depending on the polarity of the current that starts flowing through the coil. do. Next, the switch circuit 34-1 is selected and closed, and current begins to flow through the coils 31-2, 1, and at the same time, the parallel resonance formed by the capacitor 32-2 and the coils 31-2, 1 is activated in the drive circuit 33-2. Excite the circuit. Therefore, the selected coil 31-2,1
If we pay attention to the capacitor 32-2 and the drive circuit 33-2
and the switch circuit 34-1 have a configuration equivalent to that of the device shown in FIG. works the same way. However, at this time, resistor 392 somewhat increases the loss of the resonant circuit. Next, consider the operation of the coils other than the selected coils 31-2 and 1 (hereinafter referred to as half-selected coils) connected to the drive circuit 33-2 and the switch circuit 341. 2nd row coil 312, half-selected coil 31 other than 1
-2, 2-312, m are excited by the drive circuit 33-2 through the drive common line 36-2, but since the switch circuits 34-2 to 34-m are open, these half-selected coils Current cannot flow through.

Furthermore, due to the diode pair 35, the current flowing around through other coils is also zero. Therefore, the coil 31-2
, 2 to 31-2, and no leakage current flows through m. On the other hand, coils 31 other than the selected coils 31-2 and 1
-1, 1, 313, 1 to 31-N, l (hereinafter referred to as half-selection coils), the switch circuit 34-1 is closed, but the drive circuits 33-1, 33-3 to 33-n operate. Since it is not, it is not excited. Resistor 39-1, 39-3~3
9-n, capacitors 32-1, 32-3 to 32-
Since the initial voltage of n is also zero, the capacitors 32-1, 32-3 to 32-n connected to these half-selected coils
, no resonance occurs and no resonant current flows. At this time, the switch common line 371 vibrates with a non-zero positive polarity voltage, the switch common line 38-1 vibrates with a non-zero negative polarity voltage, but the drive common lines 36-1, 36-3 to 36-n Since the potential is zero, the diode pair 35-1, 1, 35-3, 1-35
Since -N and l are both in the OFF state, the current due to wraparound between the coils or through the diode is also zero.

Therefore, half-select coils 31-1, 1, 31-3, 1 to 31
-No leakage current flows through N and l. As described above, by selectively operating the drive circuit and the switch circuit, current can be passed only to the coils in which both circuits are operating, and the magnetic bubble can be driven.

Note that to cut off the coil current, as in the case of FIG. 1, the switch circuit is opened and the operation of the drive circuit is stopped and excitation is observed.

The charge remaining in the capacitor at this stop is discharged through the resistor 39 and becomes zero before the next selective drive of the coil.
FIG. 4 shows a second embodiment of the matrix selective magnetic bubble drive device according to the present invention.

Bidirectional switch circuits 41-1 to 41-n made of controlled rectifier elements are used as means for discharging the charges in the capacitors. Each of the control rectifying elements is turned off during coil selection driving, and turned on immediately after stopping driving to discharge the charge in the capacitor. Therefore, compared to the first embodiment shown in FIG. 3, when the coil is driven, the controlled rectifying element is off and has a high impedance, reducing the loss of the resonant circuit, and when the charge is discharged, the controlled rectifying element is on. This has two advantages: low impedance and short discharge time. FIG. 5 shows a third embodiment of the matrix selection type coil drive device according to the present invention.

As means for discharging the charge of the capacitor, a switch circuit 52 composed of n diode pairs 51-1 to 51-n and two Npn and pnp transistors is used. This switch circuit 52 functions in the same way as the switch circuit 14 of FIG. When discharging the charge in the capacitor, the transistor of the switch circuit 52 is turned on to close the switch circuit. Therefore, this embodiment has the same effect as the second embodiment shown in FIG. It has the advantage that only one circuit is required. Note that the diode pair 51 prevents a loop current between the drive common lines 36 from occurring. In addition, the second and third
The operation of the coil selection drive in this embodiment is exactly the same as that of the first embodiment.

The selection of one coil has been described above as the first, second, and third embodiments. However, to drive the magnetic bubble, x
Since two sets of coils, a coil and a Y coil, are required, in an actual bubble memory device, two sets each of the devices shown in Figs. 3, 4, and 5 are provided to select the same set of coils at the same time. I will do it later. Note that when the rotating magnetic field is not reversed, or even when the rotating magnetic field is reversed, the polarity of the charge remaining in the capacitor is limited to positive or negative for the coil on the side where the phase of the coil current is not reversed. .

Therefore, the switching circuit 4 in the second and third embodiments
1 and 52 no longer need to be bidirectional switch circuits.
That is, when the residual voltage of the capacitor is positive, only a switch circuit that takes out current from the capacitor is required, and when the residual voltage of the capacitor is negative, only a switch circuit that allows current to flow into the capacitor is required. Accordingly, one of the diode pair 51 is also unnecessary.

[Brief explanation of the drawing]

Fig. 1 shows a magnetic bubble drive device using a conventional parallel resonant drive system, Fig. 2 shows a magnetic bubble drive device that selectively drives m coils, and Fig. 3 shows a matrix according to the present invention. FIG. 4 is a diagram showing a first embodiment of the selective magnetic bubble drive device, FIG. 4 is a diagram showing a second embodiment of the invention, and FIG. 5 is a diagram showing a third embodiment of the invention. be. 11, 21-1 to 21-m... Magnetic bubble 1 drive coil, 12, 22... Resonance capacitor, 13, 23... Drive circuit, 14...・・・・・・
Switch circuit, 24-1 to 24-m...Switch circuit for coil selection, 31-1,1 to 31-N,m...
...Magnetic bubble drive coils arranged in a matrix, 32-1 to 32-n...Resonance capacitors, 33-1 to 33-n...Selectively operated drive circuit for selecting the coil, 34-1 to 34-m... switch circuit for selecting the coil, 35-1, 1 to 35-N, m
...Diode pair, 36-1 to 36-n...
...1 drive common line, 37-1~37-m, 38-1~
38-m...Paired switch common line, 39-
1 to 39-n...Resistance, 41-1 to 41-n.
...bidirectional switch circuit consisting of a controlled rectifier,
51-1 to 51-n... Diode pair, 52.
...Switch circuit consisting of transistors.

Claims (1)

[Claims] 1. In a magnetic bubble drive device comprising a plurality of coils that generate a rotating magnetic field for driving a magnetic bubble element, the plurality of coils are arranged in a matrix, and each row has the number of coils of all the coils in each row. A drive common line 36 is provided which is commonly connected to one terminal, and a parallel resonance capacitor 32, a means for discharging the charge of this capacitor, and a drive circuit 33 capable of selective operation are directly connected to each drive common line, and Each column has 3 pairs of diodes at the second terminal of every coil in each column.
Pair-configured switch common line 37 commonly connected via 5
, 38 are provided, and a switch circuit 34 capable of selective operation is connected to each switch common line, and the intersection of the drive common line and the switch common line selected by selecting the drive circuit and the switch circuit is connected to each switch common line. A matrix selective magnetic bubble drive device, characterized in that the coils resonate in parallel.