SU1376195A1 - Apparatus for controlling multiphase power diode converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used in valve converters. The purpose of the invention is to reduce the asymmetry of the control pulses and simplify the device. The device contains a three-channel driver of 1 reference voltage, connected to null-indicators 2-4. Comparator 11 is connected to an analog key 12. The device allows the formation of adjustable limiting signals in rectifying and inverter modes using the same elements, which leads to a reduction in asymmetry when operating in boundary modes associated with the spread of element parameters. 2 Il. with S s / s

Description

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The invention relates to converter technology and can be used in control systems for multiphase DC and AC converter units.

The purpose of the invention is to reduce the asymmetry of the control pulses that occurs when operating in the boundary rectifier and inverter modes, and to simplify the device.

Fig, I shows a diagram of the device; in fig. 2 - voltage plots that describe the operation of the device.

The device contains a three-channel driver 1 of reference voltages, for example, a three-phase transformer, the outputs of which are connected to the inputs of three null indicators 2–4, chains of series-connected resistors 5–7 and field-effect transistors 8–10, cparator 11, analog switch 12 and adjustable bias sources 12-16, the comparator output is connected to the control input of the analog switch, the bias sources are connected to the chains of a transistor - resistor through an analog key, midpoints a, b, from chains of a transistor - resistor is connected s to the second inputs of the zero-indicators of the subsequent phase, and the gates of the transistors to the outputs of the zero-indicators. The comparator input is designed for dp connection to a control voltage source.

35

Plot 17 designates reference displacements per unit displacement equal to the absolute value of Ah.

on

AT

01

From Figure 18, the voltage is also at the midpoint and the chain of the transistor is a resistor with a positive control signal, and the plot Q19 is the voltage U at the midpoint. a, a chain transistor - a resistor with a negative control signal; plot 20 - a signal for limiting the minimum angle of adjustment epyu; pa 21 - a signal for limiting the maximum angle of adjustment C.

The device works as follows.

To the inputs of zero-indicators 2-4 pos, - 50

Noah value. In this case, the inputs 17 of the indicator 4 receive signals 17 and 19, and the signal received at the output is a signal 21 of limiting the maximum control angle dlax for phase C.

The device allows generating adjustable restriction signals in the rectification mode and adjustable restriction signals in the inverter mode using the same elements for this, which leads to a reduction in asymmetry when operating in the boundary rectifier and inverter modes associated with meters of elements, and also provides increased reliability and cost reduction by simplifying the scheme. Forms, get

the voltage 17 of the reference sine wave Adn, Vdp, Cn is lost from the driver 1, and the signals to the second inputs of the null indicators are Uc (j, U; .. , and the outputs of zero-indicators, which are rectangular 180-degree signals of restrictions, do, -

The field-effect transistors 8–10, which operate in the key mode, produce voltages Uj. ,, U | Up at the midpoints of the chains, and the transistor-resistor is also rectangular in shape and has a duration of 1180 al.

Consider the formation of signals limiting AO minimum angle

control 20 and C: maximum mcc

control angle 21.

The control signal is fed to the input of the comparator 11, and its output is connected to the control input of the analog switch 12. Since the positive control signal corresponds to the rectifier operating mode of the converter and the negative to the inverter, then with a positive control signal, the analog switch 12 switches that UCM 1 and UCM 14 blended sources are connected to the circuit.

scheni, the magnitude of the bias voltage which is equal in absolute value.

In this case, the inputs of the zero-indicator 4 receives signals 17, n and 18 (figure 2). When comparing these signals, the output of the null indicator 4 generates a signal 20 for limiting the minimum control angle Ap for phase A.

In case of a negative control signal, UCMS sources 15 are connected to the circuit via an analog switch 12 and

y / l 16 displacements equal in absolute q. ,, , 50

55

Noah value. In this case, the inputs 17 of the indicator 4 receive signals 17 and 19, the signal received at the output is a signal 21 for limiting the maximum control angle. Dlax for phase C.

The device allows the generation of adjustable limiting signals in the rectifying mode and adjustable limiting signals in the inverter mode, using one for this purpose. and the same elements, which leads to a decrease in the asymmetry when operating in the boundary rectifying and inverter modes, associated with the spread of the parameters of the elements, and also improves the reliability and cost reduction by simplifying the circuit. Forms, get

A dp control device for a multiphase valve converter containing a reference driver

voltages, null-indicators with two inputs, four sources of adjustable bias, chains consisting of series-connected resistors and field-effect transistors, with the first inputs of null indicators being connected to the outputs of the driver of the reference voltage, outputs | 1-indicator-indicators The ditch is connected to the gates of the respective field-effect transistors, the connection points of the transistors and resistors are connected to the second inputs of the null indicators of the subsequent phase.

distinguishing with In order to reduce the asymmetry of the control pulses and simplify the device, it is equipped with a comparator and an analog switch, the control input of the switch connected to the output of the comparator, sources of adjustable bias, pairwise parallel to each other, through an analog switch connected to jc chains of the transistor - a resistor, and the comparator input is intended to be connected to a control voltage source.

Vop

op

Figg

Claims (1)

Claim* A device for controlling a multiphase valve converter containing a voltage driver, zero indicators with two inputs, four sources of adjustable bias, chains consisting of series-connected resistors and field effect transistors, while the first inputs of the zero indicators are connected to the outputs of the driver voltage, the outputs of the muzzle indicators are connected to the gates of the corresponding field-effect transistors, the connection points of transistors and resistors are connected to the second inputs of zero indicators of the subsequent phase, characterized in that, in order to reduce the asymmetry of the control pulses and simplify the device, it is equipped with a comparator and an analog key, moreover, the control input of the key is connected to the output of the comparator, sources of adjustable bias, pairwise parallel to each other, through an analog key jc circuits are connected to a transistor resistor, and the comparator input is designed to connect to a control voltage source.