SU888329A1 - Converter control device - Google Patents

Description

I

The invention relates to electrical engineering.

Devices for automatic control of converters are known, comprising an adjustable parameter sensor, a reference voltage source, a reference element, and a error signal amplifier 1.

The disadvantage of the device is its considerable inertia due to the need to filter the sensor signal of the adjustable parameter.

The closest technical. The essence of the invention is a device for controlling a converter, containing an error signal amplifier, made on transistors of different conductivity, the bases of which are connected to a common output of a reference voltage source and an adjustable parameter sensor, and the collectors are directly and the other through a power source connected to a control unit thyristors pl form, to the input of which I connect: whose capacitor t2},

The drawback of the device is the effect of the parameters of the transistors on the current through the capacitor, which degrades the quality of regulation.

The aim of the invention is to improve the quality of regulation.

The goal is achieved by the fact that in the device for controlling the converter the emitters of the transistors are connected to the source of the reference voltage and to the sensor of the adjustable parameter separately.

The drawing shows the scheme of the mouth

J5 roystva.

The device for controlling the converter 1 contains an error signal amplifier 2, made on transistors 3 and conduction difference connected in a common base circuit, the emitters of which are connected separately through resistors 5 and 6 to the reference voltage source 7 and the datum of adjustable parameter 8, and the collectors one directly and the other through the power source 9 are connected to a capacitor 10 connected at the input of the control unit 11 of the thyristors of the converter 1.

The device works as follows.

If the current of resistor 5 exceeds the current of resistor b, then its capacitor is charged with a current of 3g equal to their difference, and the voltage across the capacitor 10 rises. This leads to a shift of the thyristor control pulses produced by the control unit 11 and fed to the converter 1, with the result that the sensor of the adjustable parameter 8 starts to produce a lower voltage, which leads to a decrease in the current of the resistor 5. If the current of the resistor 5 is less than the current of the resistor 6, then the capacitor 10 discharges, its voltage drops. This leads to an increase in the adjustable parameter, i.e. stabilization of the controlled parameter is provided.

Separate connection of the emitters of the transistors 3 and to the sensor of the controlled parameter B and the source of the reference voltage 7 improves the quality of the regulation, since the signals are not compared to the input, s at the output of the error amplifier 2,

whereby the effect of the parameters of the transistors 3 and the operation of the device is reduced.

Claims (2)

Invention Formula Device for controlling a converter comprising an amplifier the error signal, performed on transistors of different conductivity, the bases of which are connected to the common output of the reference voltage source and the sensor of the adjustable parameter, and the collectors, one directly and the other through a power source, are connected to a thyristor control unit n {an eelectric generator, to the input of which a capacitor is connected, in order to improve the quality of control, the emitters of transistors connected to a reference voltage source and an adjustable parameter sensor separately. Information sources, taken into account during the examination 1. Kovalev F.I., Mostkova T.P. Semiconductor rectifiers. M., Energy 1978, p. 255. 2. USSR author's certificate No. 488302, cl. H 02 R 13/16, 1967.