JPS6154095A - Magnetic bubble memory device - Google Patents

Abstract

PURPOSE:To correct driving voltage with high speed by using electric power source voltage through a two-stage smoothing circuit formed by two chock coils and two capacitors. CONSTITUTION:A two-stage smoothing circuit, which is formed by two chock coils L1 and L2 and two capacitors C1 and C2 of a magnetic bubble memory device in which a temperature detector is changed over by a switching circuit 8, is selected and the coil of the memory device is driven by power source voltage through the circuit. By the two-stage composition, the value of the choke coils and capacitors can be small and the driving voltage can adapt to the change- over of a magnetic bubble memory device with high speed and can be corrected.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetic bubble memory device, and particularly to a magnetic bubble memory device (hereinafter abbreviated as device) that detects the temperature and controls the applied voltage to stabilize the device. This invention relates to improvements in temperature-compensated power supplies for operation.

In a magnetic bubble memory device, a current is passed through a magnetic bubble control coil surrounding the device, and the movement of the magnetic bubbles is controlled by the generated magnetic field, but the optimum coil current varies depending on the temperature of the device. Moreover, since the temperature of the device increases when it is operated, it is necessary to supply a coil current according to the temperature of the device in order to ensure stable operation.

[Conventional technology]

Conventionally, for temperature compensation, multiple devices in the equipment are each equipped with a temperature detector, and the output of this temperature detector is switched in synchronization with the device selection (generally, a device select signal is used), and the output is switched to the correction power supply. A correction voltage according to preset temperature-voltage characteristics is manually applied to the magnetic bubble control coil.

However, a speed of about 160 μs is required for device switching, and it is desired to obtain a temperature-corrected voltage with low ripple at high speed.

FIG. 2 is a diagram for explaining how to connect the output of the temperature detector and the power supply, in which one circuit of the switch 5 is closed by the device select signal, and the resistor 6.7 of that circuit and thermistor temperature detector 2a 7 are closed. ! l< DC/Connected to DC converter (power supply) 3.

The terminals of the DC/DC converter 3 are connected to a differential amplifier (not shown) inside the DC/DC converter 3, and are connected to a resistor 6. The voltage divided by the thermistor temperature detector 2a and the resistor 7 is input to the differential amplifier. However, since the resistance value of the thermistor changes depending on the temperature, the divided voltage also changes depending on the temperature and is input to the differential amplifier in the DC/DC converter 3. After the differential amplifier inputs power to the switching circuit, it is smoothed and supplied to the drive coil. FIG. 3 is a diagram for explaining a conventional smoothing circuit and the waveform of the output voltage.

Figure 3 1al shows a smoothing circuit, in which the voltage that has passed through the switching circuit 8 and has been pulse width corrected in accordance with the temperature of about 18VP-P is applied to the choke coil (L) 9 (700μH).
), a capacitor (C) 10 (200 μH), and then supplied to a device drive coil.

Figure 3 (bl is supplied to the drive coil when switching from the temperature detector 2a compatible with device type 0 to the temperature detector 2b compatible with device #1, and then back to the temperature detector 2a compatible with device type 0 Change in voltage (V, -V2
-V, ), and it takes time for the voltage to change because of the choke coil (L) and capacitor (C) when the voltage drops, and because of the capacitor (C) when the voltage rises. [Problems to be Solved] In the conventional power supply smoothing circuit described above, if the choke coil capacitor is made large to achieve complete smoothing, it will not be possible to adapt to the voltage change at the time of switching when the device switching time is high, about 160 μs. There was a problem.

[Means for solving problems]

The present invention provides a magnetic bubble memory device that solves the above-mentioned problems by supplying the magnetic bubble memory to the device through a two-stage smoothing circuit consisting of two choke coils and two capacitors.

(Function) In the magnetic bubble memory device described above, the values of the choke coil and capacitor can be significantly smaller than in the case of a single-stage smoothing circuit, so the charging and discharging time of the capacitor due to voltage changes can be shortened, and the device can be The output voltage change can adapt to the switching time of the temperature sensor.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a circuit diagram showing the configuration of a voltage smoothing circuit according to the present invention.

The output from the switching circuit 8 is the choke coil 11
(200μH), capacitor 12 (47μH), and then choke coil 13 (47μH).
(20 μH) and enters the second smoothing circuit consisting of capacitor 14 (33 μH).

When switching the temperature sensor from device #0 to device #1, change the voltage supplied to the drive coil (
Typical value of drive voltage: approx. 12■, correction voltage range: approx. 350mV
), the choke coil and capacitor values can be reduced, reducing the device switching time (approximately 1
Voltage correction is possible within 60 μs).

〔Effect of the invention〕

As explained above, according to the present invention, the time constants for charging and discharging can be reduced by reducing the capacitance of the capacitor, it can adapt to high-speed switching between devices, and it can be completely stabilized with a two-stage smoothing circuit. The effect is that a voltage is supplied to the drive coil of the device.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing the configuration of the voltage smoothing circuit of the present invention, Fig. 2 is a diagram for explaining the method of connecting the output of the temperature sensor and the power supply, and Fig. 3 is a circuit diagram showing the configuration of the voltage smoothing circuit of the present invention. FIG. 3 is a diagram for explaining waveforms. In the figure, 1 is a magnetic bubble memory device, 2 is a temperature detector, 3 is a DC/DCC/formula-ta,
4 is a coil, 5 is a switch, 6.7 is a resistor, 8 is a switching circuit, 9, IL 13 is a choke coil, 10, 12.14 is a capacitor, respectively. Figure 1 2v1

Claims (1)

[Claims] It consists of a plurality of temperature detectors corresponding to each of the plurality of magnetic bubble memory devices, and the output of the temperature detector is switched in synchronization with the selection of the magnetic bubble device, and is input to the power supply for driving the coil of the magnetic bubble memory device. In a magnetic bubble memory device in which the power supply voltage is controlled by
A magnetic bubble memory device characterized in that the output of the power source is input to a two-stage smoothing circuit consisting of a choke coil and a capacitor.