RU1791871C - Protection device on fuse interrupters - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used in protection devices interrupting excessive electric current by melting of fusible material. The purpose of the invention is to increase the number of protective operations while reducing the cost of each protective operation. The protection device on fuses with an electronic mechanism for their automatic substitution contains a multi-element matrix of fuses implemented on an integrated microcircuit programmable read-only memory with transistor-transistor logic, and a control unit that can be performed either on switches with manual control, or on a binary counter controlled by a normative chain generating a counter switching signal at the end of a dangerous overvoltage the chain being brushed. 1 s.p. f-ly, 1 ill.

Description

The invention relates to the field of electrical engineering and can be used in protection devices interrupting excessive electric current by melting and moving lightly material.

Protection devices with redundant fuse links are known.

A disadvantage of these devices is the small number of protective operations that can be implemented.

The closest to the present invention in terms of technical nature and the achieved result is a fuse protection device with an electronic mechanism for their automatic replacement.

The disadvantage of this device is the insufficient number of protective operations at the high cost of one protective operation.

The purpose of the invention is to increase the number of protective operations while reducing the cost of each protective operation,

This goal is achieved in that the protection device on fuses with an electronic mechanism for their automatic replacement contains a multi-element matrix of fuses with an electronic mechanism for their replacement, implemented on an integrated microcircuit programmable read-only memory device with transistor-transistor logic, and a control unit, the outputs of which connected to the address inputs of a programmable read-only memory, output for connecting the voltage of the cat cerned and data terminal connected

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with the output of the programmable read-only memory shared bus, are outputs for connecting the protection device to the protected circuit.

The control unit contains a binary counter and a normalizing chain made in the form of series-connected resistor and capacitor, parallel to which a zener diode is connected, the interconnected outputs of the resistor, capacitor and zener diode are the input of the normalizing chain and are connected to the counting input counter, other terminals of the capacitor and zener diode are connected to the common bus of the control unit, and the other terminal of the resistor is the input of the control unit, the output of which are the outputs of the bits of the counter .; /

The drawing shows a diagram of the protection device ..:

The fuse protection device shown in the drawing shows an input terminal 1, a protected object 2, programmable read-only memory (EPROM) 3 with transistor-transistor logic, burnable memory elements 4 of the EPROM 3, control unit 5, terminals 6 attached to a common bus. The control unit 5 includes a binary counter 7, a resistor 8, a capacitor 9, and a zener diode 10.

The protection device operates as follows.

A signal of the zero level is applied to the control input of the EPROM 3 (input V), which transfers the EPROM to the programming mode, i.e. recording information. The current of the useful signal supplied to the input terminal 1 passes through the protected object 2 to the output of the ROM 3. designed to connect the supply voltage (terminal + E). Then, through the internal logic elements of the EPROM 3 and through one of the burned-out memory elements 4, which is selected in accordance with the code coming from the control unit 5 to the address inputs of the EPROM 3, this current enters the common bus via data output (if a single-bit EPROM is used ) or through one of the data outputs (when using a multi-bit EPROM), for example, through output B0.

When a dangerous overvoltage pulse occurs at the input terminal 1 with respect to the common bus, the current passing through the circuit described above burns out the memory element 4, which thereby fulfills the function of a fuse jumper. This protects the facility 2.

When using standard ROMs manufactured by industry, after burning out memory element 4, the leakage current

through an open area does not exceed 10-9 10-Yud

The hazardous overvoltage pulse through the resistor 8 of the control unit 5 also enters the capacitor 9 and charges it to a voltage whose value is limited by the zener diode 10, which protects the counter input of the counter 7 from damage by the overvoltage pulse. After the end of the pulse, the overvoltage of the capacitor 9 is discharged, as a result of which the counter 7 switches and the code changes at its outputs connected to the address inputs of the EEPROM according to the voltage drop on the capacitor 9. By changing the code at the address inputs of the EPROM 3, the next cell of the EPROM 3 is connected to the protected circuit with its intact burned memory element 4.

Similarly, object 2 is protected against subsequent overvoltage pulses and automatically connects all new PROM cells until they are completely used up.

In other embodiments of the protection device of the present invention, the control unit 5 may be configured on manually operated switches. In this case, the operator, after detecting the end of the overvoltage pulse, dials the following binary code combination using the switches, thereby changing the code on the address inputs of the EPROM 3 and including the next cell of the EPROM 3 in the protected circuit containing its burned memory element 4.

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Claims (1)

1. A protection device on fuses with an electronic mechanism for their automatic replacement, characterized in that, in order to increase the number of protective operations while reducing the cost of each protective operation, it contains a multi-element matrix of fuses with an electronic mechanism for their replacement implemented on an integrated circuit programmable read-only memory device with transistor-transistor logic, and a control unit, the outputs of which are connected to the address inputs of a programmable read-only memory device, an output for connecting a supply voltage of which and a data output connected to an output of a common bus of programmable read-only memory device are terminals for connecting a protection device to a protected electrical circuit. . "... 2, The device according to claim 1, with the exception of that. that the control unit contains a binary counter and a normalizing chain made in the form of a series-connected resistor and capacitor, in parallel with which a stabilizer is connected ron, the interconnected terminals of the resistor, capacitor and zener diode are the output of the normalizing chain and are connected to the counter input of the counter, the other terminals of the capacitor and zener diode are connected to the common bus of the control unit, and the other terminal of the resistor is the input of the control unit, the output of which is the output of the discharge Dov counter.