SU661713A1 - Inverter control device - Google Patents

Description

one

The invention relates to the field of semiconductor technology and thyristor frequency converters and can be used to control thyristors of independent inverters with adjustable or stabilized output frequency.

An inverter control device is known, consisting of a pulse generator with two anti-phase outputs, a power supply unit, six thyristors and six transformers with primary and secondary windings, in which the thyristors are connected in series, with the anode of the first thyristor connected to the positive pole of the power supply unit, to the cathodes of each of the thyristors a circuit is connected from the series-connected primary windings of pulse transformers, the second ends of which primary windings are interconnected and connected the negative pole of the power supply unit 1.

A disadvantage of the known device is low efficiency, as well as the fact that the series connection of several thyristors significantly increases the value of the direct voltage drop across the entire chain due to high residual voltage values, which leads to a change in the parameters of the control pulses of all subsequent channels.

A device for controlling the inverter thyristors is known, comprising a push-pull master pulse generator, control pulse drivers and pulse distributors in the form of successively connected key elements connected via the return power unit to the power supply bus, the outputs of which are connected to another power supply bus and The control electrodes of the key elements of even and odd are connected to opposite outputs of the master oscillator, respectively 2.

The disadvantages of this device are the significant power consumption due to the high holding current of the series distributor; the complexity of the design of the output stage of the generator of its generator, since the number of its output windings must be equal to the number of cells of the serial distributor.

The aim of the invention is to reduce power consumption, simplify the master oscillator and increase the stability of the control pulses.

This goal is achieved by the fact that each key element is designed as a transistor, the base of which is connected via a series-connected additional resistor and thyristor to the negative power supply line.

The drawing is a schematic diagram of an apparatus for controlling an inverter.

The device contains transistors 1-6 of the distributor, connected in a series; resistors 7-12; low-power triode thyristors 13-18 included in the basic circuits of the triodes; shapers 19–24 output control pulses; capacitors 25-30, providing the necessary power and duration of control pulses; development diodes 31-36; a transistor-thyristor distributor return unit 37 to the initial state; master pulse generator 38; a resistor 39 limiting the charge current of the capacitors; charge thyristor 40; reset transistor 41; damping capacitor 42; a resistor 43 providing for recharging the capacitor 42 to its initial state; output windings 44, 45 of the master generator; output terminals b, 47 return units; distributor power supply 48; source 49 charge capacitors 25-30.

The device works in a manner.

In the initial state, all the thyristors 13-18 and, consequently, the transistors 1-6 are turned off, and the capacitors 25-30 are charged before the voltage of the source 49. At some point in Time, the pulse of the output winding 44 of the master oscillator 38 includes all the odd thyristors 13, 15, 17, which connect the bases of the respective thyristors 1, 3, 5 to the negative pole of the power source 48. Only the transistor 1 is turned on, since the others are separated from the power source by the even-numbered group 1 off.

The capacitor 25, discharging through the transistor 1 to the pulse transformer 19, generates a control pulse for turning on the inverter's power thyristor.

At the next time point, the pulse of the output winding 45 of the master oscillator 38 includes all even thyristors 14, 16, 18, which connect the bases of the transistor 2, 4.6 to the minus of the source 48. At that, only the transistor 2 and the capacitor 26 turn on, discharging transformer 20 generates successive control pulses to power thyristors.

The next clock cycle includes the transistor 3, etc.

The next moment in time turns on a six-way transistor

kidney 6 and connects to the power source 48 a unit for returning the transistor-thyristor distributor to the initial state. The pulses from the output 46 of the block 37 turn on the reset transistor 41, and the capacitor 42 suppresses the thyristor 13, which ensures the switching off of the transistor 1 and, therefore, consistently, the entire sequential chain of the distributor. At the next time point, the pulses from the output 47 of block 37 turn on an additional charge thyristor 40, which provides for the simultaneous charging of all capacitors 25-30 to the voltage of source 49. Resistor 39 serves to limit the inrush current through the thyristor 40 and equalizing diodes 31-36 .

Thus, the circuit is in the initial state and after the next clock pulse of the generator reopens the transistor 1, and a control pulse is generated at the output of the transformer 19, and

a capacitor 42, charged by the circuit (+ 48 -43 -42 -13 -38 -38), is prepared for the next quenching of the distributor.

Thus, in the proposed control system, by using a thyristor-transistor series distributor of power supply circuits of the distributor and driver controllers, the power consumption is minimized and the output is simplified. the master oscillator cascade and the voltage drop across the series of the distributor decreases significantly.

Claims (2)

1. USSR author's certificate No. 270054, MKI N 02 R 13/18, 1968. 2. USSR Author's Certificate No. 284150, MKI2 N 02 M 1/08, 1967.