SU783926A1 - Frequency converter - Google Patents

Description

(5 4) FREQUENCY CONVERTER

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The invention relates to the field of converter technology, namely to thyristor frequency converters.

A known converter is equipped with a control unit which, on a stop signal, converts the rectifier into inverter mode 1.10.

A disadvantage of this device is low reliability. -

The closest in technical means and the achieved result is a frequency converter consisting of a rectifier connected 15 to the start-stop unit and an inverter connected to the control pulse inhibitor unit 2.

The disadvantage of this converter is the low reliability due to the inverter tipping over and the thyristors being overloaded when stopped.

The purpose of the invention is to increase the reliability of the converter .25

This goal is achieved by the fact that the converter is equipped with a delay element, the input of which is connected to the output of the start-stop unit, and the output - to the input of the inhibiting unit and to;

optional input block start-stop.

The drawing shows a block diagram of the frequency converter.

The converter is stopped as follows.

At the input of the unit 1 start-stop, a stop signal (technological or emergency). The signal from the output of unit 1 transfers rectifier 2 to the inverter mode, thereby removing the supply voltage from inverter 3. The control pulses from the inverter thyristors are not removed. The same stop signal triggers the 4th delay element, the signal from the KOTOjxjro output after a specified time goes to the control-prohibiting block 5 prohibiting the passage of the latter to the inverter thyristors, and to the auxiliary input of the block 1 prohibiting the passage of control pulses to the rectifier thyristors. The inverter shuts down without stalling for the time required to dissipate the energy stored by the inductances of the converter through the load b and rectifier 2 operating in: inverter: mode. Through

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Claims (2)

., t, -,. . m- ... fr is the time determined by the delay element, the converter is turned off. Claim P) E is an astrology generator, consisting of a coupler connected to the unit and a inverter connected to it, connected to an inverter connected to a power supply unit, which is equipped with a delay element, a input, a voltage element, a voltage input, which is connected to the inverter. with the output of the start-stop unit, and the output with the input of the inhibit unit and the second input of the start-up unit. Sources of information taken into account in the examination 1. L. Tverdin. Protection of thyristor converter. Web. Power semiconductor devices and installations. M., Energie, 1967, p.127. 2. Japanese Patent 49-31694, cl. 56 C 62, 1974.