JPS6160508B2 - - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a control device into which a magnetic bubble cassette is inserted and which performs power supply, write/read control, etc.

Conventional technology and problems In general, a magnetic bubble cassette, in which a bubble device consisting of a magnetic chip, a driving coil, a holding magnet, etc. is mounted on a printed board and housed in a case, is
It is removably connected by being plugged into a control circuit (also called a peripheral circuit). Power for bubble devices is supplied from the peripheral circuit, but in the past, the power was kept on even when the cassette was disconnected, so there was a risk that abnormal current would flow when the cassette was inserted, destroying information. This is because, as shown in FIG. 5, there is a distributed capacitance Cs in the conductor wire of each function gate of the bubble device, and the current i that charges the distributed capacitance Cs flows rapidly. In the same figure
MJL is a major loop, MNL is multiple minor loops, REP is a replicator that reads bubbles from the minor loop MNL to the major loop MJL, GEN is a generator that generates bubbles,
SWP is a swap gate that takes in (writes) into the minor loop MNL the bubble train generated by the generator GEN and transferred through the propagation path PL. REP,
SWP and GEN are collectively called function gates and are current-operated, so the main part is a conductor, where the distributed capacitance Cs described above exists. Further, a constant current source is connected to the non-power supply side of these gates, and if this constant current source is composed of, for example, a transistor, the capacitance between its collector and base is also charged. And the charging current i for these capacities
If the peak value of is large, a large amount of magnetic flux is generated, which is the same as during normal operation, and this causes information destruction.
For example, when a current i flows through the replicator REP, a bubble (usually there is a bubble under the swap gate) is expanded and divided, and the bubble enters the major loop. This, of course, results in an error.

Even if the power is turned on after the cassette is inserted, for example, the connection of the cassette is detected and a relay is activated to turn on the power, the problem still remains. That is, even with this method, since the power supply rises steeply, the charging current i of the capacitor Cs flows rapidly.

OBJECTS OF THE INVENTION The present invention aims to prevent abnormal current from flowing through the function gate and causing an error by gradually turning on the power after the magnetic bubble cassette is connected.

Structure of the Invention The present invention provides a control device into which a magnetic bubble cassette is inserted and which performs power supply, write/read control, etc. of the cassette. The invention is characterized in that a power supply circuit is provided with a time constant set so that the rise of the cassette becomes gradual, and the power supply circuit starts outputting after the detection circuit detects insertion of the cassette. This will be explained in detail with reference to the illustrated embodiment.

Embodiment of the Invention FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a signal waveform diagram of each part thereof. As described above, the magnetic bubble cassette 10 has a bubble device mounted on a printed circuit board, and is connected to peripheral circuits using a multi-pin connector. 11 and 12 are some of the pins (terminals), 11 is the power supply terminal, 1
2 is a terminal that notifies connection. On the peripheral circuit 20 side, there is a terminal 2 that mates with these terminals 11 and 12.
There are 1 and 22. R is a pull-up resistor that pulls up the terminal 22 to a constant voltage Vc, and keeps the cassette connection detection signal at Vc, that is, a high level, if the cassette 10 is not connected. This signal drops to 0V when grounded terminal 12 of cassette 10 is connected to terminal 22 of peripheral circuit 20, indicating cassette connection. This point is t ₀ in FIG. 2. The power supply circuit 23 may start outputting from this point, but since the connector of the cassette 10 is a multi-pin type, such as 24 pins, even when the terminal 12 is mated, all the remaining terminals are mated. It doesn't necessarily mean there are. Therefore, the delay circuit 24 delays the signal by T ₁ time, and the power supply circuit 23 is activated by the delayed output that falls at time t ₁ . Even when the power supply circuit 23 is activated by a signal, the output does not rise abruptly, but gradually increases to the rated value V _F by adding a capacity determined in consideration of the distributed capacitance on the cassette 10 side to the output stage. . As a result, the current i flowing into the cassette 10
The peak value of can be significantly reduced. In addition, by giving an operation enable signal to the write/read control circuit of the bubble memory after the power supply has sufficiently risen to V _F (t ₂ ), operations before the power supply is started are prohibited to prevent information destruction. This signal can be created, for example, by applying a delay time of T ₂ to the signal using the delay circuit 24.

FIG. 3 shows a specific example of the power supply circuit 23 and the delay circuit 24. The resistor R ₁ and capacitor C ₁ of the delay circuit 24 give a delay time T ₁ to the signal, and the resistor R ₂ and capacitor C ₂ give a delay time T ₂ to the signal. These delay times may be provided by a delay line. _I1 to _I4
is an inverter for inversion and waveform shaping. The power supply circuit 23 has a capacity that smooths the rise of the output stage.
Has _C3 . If the cassette 10 is not connected, the signal is L (low), so the transistor _Q1 is off, so the transistor _Q2 is also off, and the output and capacitor _C3 are grounded through the high resistance _R4 and kept at 0V. . In contrast, cassette 10
is connected and the signal becomes H (high) after a certain period of time, transistor Q ₁ turns on, and as a result transistor Q ₂ turns on, so capacitor C ₃ begins to be charged through resistor R ₃ . The rise of the output at this time is
Since it can be moderately suppressed by the time constants R ₃ and C ₃ , the peak value of the current i can be kept low as shown in FIG. In other words, by increasing the charging time t from the relationship i=C・dv/dt, the current i
can reduce the peak value of In this case, C is the aforementioned distributed capacitance Cs on the cassette side, and v is the power supply voltage of the rated value _VF . The power supply circuit 23 is not limited to the above example, and may be configured to control the on/off period of switching using, for example, a switching regulator and a smoothing circuit.

FIG. 4 shows another embodiment of the present invention, in which the operation permission signal given to the bubble memory control circuit is sent to the power supply circuit 23.
It is designed to detect directly from the output of . In the example shown in FIG. 1, the signal is created by the delay circuit 24, but due to the nature of this signal, it needs to change after the output rises sufficiently, so the power supply detection circuit 24
If the output is directly detected in step 5, the signal change timing will be more reliable.

Effects of the Invention As described above, according to the present invention, no more current is generated when the magnetic bubble cassette is connected.
This has the advantage of preventing information from being destroyed when the cassette is attached or detached.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is a signal waveform diagram of each part, FIG. 3 is a main circuit diagram showing a specific example of FIG. 1, FIG. 4 is a block diagram showing another embodiment of the present invention, and FIG. 5 is a bubble device diagram. It is a main part configuration diagram. In the figure, 10 is a magnetic bubble cassette, 11 is a power supply terminal, 12 is a connection notification terminal, 20 is a control device, 23 is a power supply circuit, _C3 is a capacitor for start-up control, and R is a resistor for detecting cassette connection. .

Claims (1)

[Scope of Claims] 1. In a control device into which a magnetic bubble cassette is inserted and which performs power supply, write/read control, etc. of the cassette, the control device is provided with a circuit for detecting the insertion of the cassette, and also has a power supply voltage to be outputted. A magnetic bubble cassette characterized in that a power supply circuit is provided with a time constant set so that the rise of the magnetic bubble cassette becomes gradual, and the power supply circuit starts outputting after the detection circuit detects insertion of the cassette. control device. 2. The control device for a magnetic bubble cassette according to claim 1, wherein the power supply circuit is configured to start outputting after a certain period of time after the detection circuit detects insertion of the cassette.