SU389496A1 - {ALL-UNION - Google Patents

Description

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A known stabilized power supply with a protection device containing a pre-stabilizer with a series regulating element, a dc-to-ac converter, whose output busbars are connected to the transformer primary winding, the output winding of which is connected through a rectifier and filter (or directly) to the load, and through a feedback circuit with a pre-stabilizer amplifier, a relay whose winding is connected in parallel with the pre-stabilizer input and is unreliable protection regulatory stabilizer element, and low ".p.d. overvoltage on input.

The purpose of the present invention is to identify these disadvantages.

This goal is achieved by the fact that one of the converter buses is directly connected to one of the ends of the transformer primary winding, and the other is connected1 through normally open relay contacts to the other end and through normally closed relay contacts to the internal tap of the same winding of the transformer.

FIG. 1 The block diagram of the proposed stabilized source with a protection device is given; in fig. 2 shows one of the possible variants of the relay circuit concept with a stabilizer transformer.

When the nominal input relay is / is in the off position, and to the output of the converter 2 is connected via normally closed contacts of the relay 1 part of the primary winding of the transformer 3. This circuit condition is maintained until an input overvoltage occurs That is, the input voltage does not reach such a value that the voltage drop across the regulating element of the pre-regulator 4 or its power does not reach the maximum permissible value.

In this case, the relay / is triggered, opens its normally closed contacts, closes the normally open contacts, connects to the output of the converter the entire primary winding of the transformer 3.

The transformation ratio of transformer 3 decreases abruptly, and the voltage at its output drops. With the help of .nenn feedback and amplifier 5, the reference and output voltages of the pre-stabilizer 4 are abruptly set at a new, higher level, and are fed through the converter to the entire primary winding of the transformer. At the same time, the voltage at the source output returns to the previous nominal value. At the same time, due to an increase in the output voltage of the stabilizer 4, the voltage drop across its regulating element decreases.

A reduction in the transfer ratio also leads to a decrease in the current passing through the regulating element. A decrease in the current passing through the regulating element and a decrease in the voltage drop thereon ultimately leads to a "reduction in the power dissipated on the regulating element.

It is possible to turn on the input of the source of the winding of non-striking relays with different voltages of operation (Fig. 2). The relays alternately triggered three continuous increase in input voltage above the permissible level. With their contacts, each relay alternately adds to the converter output a corresponding section of the primary transformer de-coupling, reducing this transformation ratio.

When the relay is triggered, the output voltage drops, which leads to an increase in the output voltage, a preliminary stabilizer, and therefore a return, vB-output voltage to its nominal value with the help of a chain of coupling.

  P |) and decreasing the input voltage of the relay is turned off in reverse order. The use of non-fine relays allows the input voltage range to be expanded.

The number of relays, their voltage from release and release, levels of stabilization and

Transformer transformation ratios are selected depending on the specific operating conditions and overloads that are most dangerous for the type of stabilizer chosen.

Subject invention

A stabilized power supply with a protection device containing a pre-stabilizer with a series regulating element, a dc-to-ac converter, two output buses of which are connected to the primary winding of the transformer, the output winding of which is connected via a cable and filter (or directly) to the load and through a feedback circuit with a pre-stabilizer amplifier, a relay whose winding is connected in parallel with the input

pre-stabilizer, characterized in that, in order to protect the pre-stabilizer regulating element from overvoltage, at the input while maintaining a high ".eff.", one of the converter buses is directly connected to one of the ends of the transformer primary winding and the other it is connected through normally open relay contacts to the other end and through normally closed relay contacts with an internal tap of the same winding of the formaghgor.

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