SU1264155A1 - System for supplying power to semiconductor equipment with selective overload protection - Google Patents

Abstract

The invention relates to electrical engineering, in particular to stabilized power sources. The aim of the invention is to improve the reliability of locking transistors of control elements when using a common bias source. When current is exceeded at the output of any stabilizer, the signal from the corresponding current sensor 18 will turn on with (, -4ffS

Description

01c thyristor 16, Then the current flowing through the current source (resistor) 15 and previously opened transistors 9, 10 will flow through the circuit: diode 19, thyristor 16, bias source 17 and then through the common bus system and unstabilized power supply 1. A reverse block voltage will be applied to the transistors 9, 10. The bias current is determined only by resis 1264

the bias torus 13 and the voltage of the bias source 17 and does not depend on the magnitude of the current set by the resistor 15 and the voltage of the source 1. As a result, the reliability of locking the transistors 9, 10 increases. Similarly, the locking of the transistors of the regulating elements of other stabilizers occurs when the corresponding current sensors . I il.

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The invention relates to electrical engineering, in particular to stabilized power sources, and can be used as stabilized power sources.

The purpose of the invention is to increase the reliability of locking the transistors of the regulating elements of the power supply stabilizers using a common bias source.

The drawing shows a circuit diagram of a power supply system for semiconductor equipment with selective overload protection.

The power system contains unstabilized power sources, voltage regulators of the same type 5-8, each consisting of a regulating element on transistors 9 and 10, the base-emitter transitions of which are bridged by reverse diodes 11 and 12, bias resistor 13, the current-limiting bias source, the comparison node 14 with an output current source (e.g., a resistor) 15, a thyristor 16 connecting the source of the bias 17 to the signal from the load current sensor 18, separating the diodes 19 and 20, the signal lamp 21 signaling the transducer ke goods, button 22, which returns the security node in the initial state, the bypass diode 23 which is connected in parallel with the output of a single stabilizer.

The device works as follows.

When the load current at the output of the stabilizer is less than the nominal current determined by the setpoint of the current sensors 18, the output signal of the current sensors is zero, the thyristor 16 is turned off. If the current at the output of any stabilizer exceeds the nominal value, then the signal from the output of the corresponding current sensor 18 includes the corresponding thyristor 16 (for example, the 16 V thyristor of stabilizer 5 is turned on). Then the current flowing through the current source (resistor) 15 and the previously opened transistors 9 and 10 flows through. Circuits: separation diode 19 - thyristor 16 - bias source 17 and then through the common bus system and unstable power supply 1. The reverse blocking voltage detected by the current passing through the transistor 9 and 10 of the regulating element of the stabilizer 5 is applied to the base. Circuits: positive bias source bus 17 - shunting diode 23 - reverse diodes 11 and 12 - bias resistor 13 - separation diode 19 - thyristor 16 and minus bus bias source. In this case, the bias current is almost completely determined only by the magnitude of the bias resistor 13 and the voltage of bias source 17 and does not depend on the magnitude of the current specified by the current source (resistor) 15 and the voltage of the unstabilized power source 1, thereby locking the reliability of the transistors 9 and 10 of the regulating element of the stabilizer 5. Similarly, the locking of the transistors of the regulating elements occurs

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other stabilizers when the corresponding sensors load current.

In this case, the protection of the transistors of the regulating element of each stabilizer is carried out selectively, i.e. when overloading at the output of any number of stabilizers, the transistors of their regulating elements are reliably locked, which is provided by one common source for the entire power supply system, and the other stabilizers continue to operate normally. The lamp 21 signals the operation of the protection circuit, and the button 22 serves to return the protection circuit to the initial state.

Claims (1)

Invention Formula The power supply system of semiconductor equipment with selective protection against overloads, containing a common source of bias, a source of unstabilized power, to the output of which stabilizers are connected, each 54 which includes a series regulating element on transistors, the base-emitter junction of which is bridged by reverse diodes, the comparison node, the output of which is connected to the input through a current source, and the input to the output pins of the stabilizer, thyristor, separation diode, bias resistor, load current sensor, output which is connected to the control input of the thyristor, a shunt diode, characterized in that, in order to increase the reliability of locking the transistors of the regulating elements of the power supply stabilizers using common bias source, the outputs of the stabilizer comparison nodes are connected via the bias resistor to the bases of the transistors of the regulating elements, and through the separation diode and thyristor to one bias source bus, the other bus of which is connected to the common power system bus, the shunt diode is connected in parallel to the output terminals of each stabilizer.