SU1485308A1 - Pulsed current shaper for control elements of cylindrical magnetic domain storage - Google Patents

Description

The invention relates to computing and can be used. used in storage devices on cylindrical magnetic domains (CMD) for the formation of impulse current in control elements,

the hoard. The purpose of the invention is to improve the reliability of the device by eliminating the discharge current through the drive control elements on the CMD. The pulse current shaper contains the sources 1, 2 of the power supply * current-generating element 3 and the discharge element 4, made in the form of resistors, the protective element 5 on the capacitor, the key element 6, made on the transistor, the protective elements 7 and 8 in the form of diodes. Using the formation of a pulsed current eliminates the flow of a discharge current through the control elements of a storage device on a CMD such as a generator, input and output switches. Reducing the capacitance of the protective capacitor ensures effective protection of the drive control element on the CMD in the event of a key element failure. 1 il.

5 and 1485308 A

2

3

1485308

four

The invention relates to computing and can be used in storage devices on cylindrical magnetic domains (CMD) for the formation of a pulsed current in the drive control elements.

The aim of the invention is to improve the reliability of the device by eliminating the discharge current through the control elements of the drive on the CMD such as a generator, input and output switches.

The drawing shows a diagram of the pulse current driver.

The pulse current driver contains the first 1 and second 2 power sources, the current-carrying element 3 in the form of a resistor, the discharge element 4 in the form of a resistor, the first protective element 5 in the form of a capacitor, the key element 6 on the transistor, the second 7 and the third 8 protective elements in the form of diodes .

The drawing shows the control element 9 of the drive on the CMD, the control input 10, the first 11 and the second 12 outputs of the pulse current driver.

The pulse current driver works as follows.

Upon receipt of the control input 10 of the control voltage pulse transistor 6 opens. The collector current of transistor 6 is distributed over the circuits formed by the discharge resistor 4 and the control element 9. If the ratio of their resistances is 20-50, then almost the entire collector current flows through the control element 9. At the same time, its amplitude practically does not depend on the voltage drops across the capacitor 5 , diode 8 and other parameters of the circuit through which current flows. In this case, the capacitance of the capacitor 5 can be reduced to such an extent as to ensure effective protection of the control element 9 against overcurrent in the event of a failure of the key element transistor 6. So, if the control element 9 is a CMD generator, then the capacitance value of the capacitor 5 can be 0.2 μF, and the resistance of the discharge resistor 4 is equal to 100 0m. In this case, the dynamic bias voltage does not exceed 0.2 V, and the amplitude of the voltage change on the Capacitor 5 is about 1 V.

In the presence of a control pulse at the input 10, the current flows through the diode 8, and the diode 7 is closed. After the termination of the control pulse, the diode 8 is locked, and the diode 7 is open. The discharge current flows through the resistor 4 and the diode 7; there is no current in the circuit of the control element 9. Use as the second 7 and third 8 protective elements of the diodes leads to the fact that the capacitor 5 is not fully discharged. However, the transistor 6 operates in an unsaturated (linear) mode and, connected according to a common emitter circuit, is a current source. As a result, the residual voltage on the capacitor 5 has almost no effect on the parameters of the current pulse c. control element 9.

Thus, the use of a pulse current driver makes it possible to exclude the flow of a discharge current through the drive control elements on the CMD and increase the reliability of its operation. Reducing the capacitance of the protective capacitor ensures effective protection of the drive control element on the CMD in the event of a key element failure.

Claims (1)

Claim Pulse current driver for control elements of a drive on cylindrical magnetic domains, containing the first and second power sources, current-setting and discharge elements made in the form of resistors, the first protective element made in the form of a capacitor, and a key element made on a transistor, the output of which is the control input of the pulse current driver, and the collector output of the transistor - the first output of the device, the emitter output of the transistor is connected to the first output of the current supply element the second terminal of which is connected to the output of the second power source, the first terminal of the discharge element is connected to the collector terminal of the transistor, and the second terminal is connected to the first terminal of the first protective element and the output of the first power source, different five The fact that, in order to increase reliability by eliminating the discharge current through the drive control elements, the driver contains the second and third protective elements made on the diodes, and the output of the anode of the diode of the second protective element is connected to the collector output 1485308 6 transistor, the output of the anode of the diode third of its protective element is connected to the output of the cathode of the diode of the second protective element and connected to the second output of the first protective element, the output of the cathode of the diode of the third protective element is the second output of the pulse current driver.