SU1283902A1 - Pulsed d.c.voltage converter - Google Patents

Abstract

The invention relates to the field of converter technology and can be used in industrial DC electric drive systems. The purpose of the invention is to expand the range of adjustment and increase reliability. The device contains a main thyristor 1, shunted by a circuit of series-connected shunt diode 2 and winding 3 of an auxiliary commutator degrothsel 4. The additional winding 5 of a commutating throttle 4 is connected to the load circuit 12 connected to the power supply plus, the temporal thyristor 6 is bounded by a diode 7. Switching a capacitor 8 is connected between the cathode of diode 7 and the anode of diode 2 connected to the minus of the power supply. The choke 9 is connected between the thyristor cathode 6 and the thyristor anode 1. The thyristor 6 cathode through the reverse diode 10, and its cathode through the dose circuit 11 and the switching capacitor 8 are connected to the source of the power source. This goal is achieved by introducing into the load circuit the winding 5, which allows an appropriate choice of the ratios of the switching commutators necessary to remove the switching overvoltage on the load generated by the winding 3 and improve the shape of the voltage curve applied to the thyristor 1 after it is locked by reducing the jump voltage at the time of closing the diode 2. 2 Il. (L

Description

11283902

The invention relates to converter equipment, in particular, to pulsed DC converters, and can be used in industrial electric drive systems of direct current, as well as for traction electric drive of urban electrified transport.

FIG. 1 is a diagram of an impulse DC voltage converter with a compensating two-wound inductor; figure 2 - timing diagrams of the switching process.

A DC / DC pulse converter (FIG. 1) consists of a main thyristor 1, which is shunt from a series-connected shunt

The charge (time interval) of the switching capacitor 8 flows through the main thyristor 1 in the opposite direction, as a result of which the current of the main thyristor decreases to zero.

At time t, the main thyristor 1 goes to non-conducting c. Standby, the load current is closed along the circuit containing the power source E, the load 12, the secondary winding 5 of the double-winding throttle 4, the switching choke 9, the diode 7 and the switching capacitor 8. At the same time, the diode 2 opens, forming an oscillating circuit 8-2-3 -Y-7-8. In the process of oscillating recharging, a part of the voltage of the commuting capacitor 8 is applied to the primary

shunt diode 2 and the primary winding-20 winding 3 double-wound throttle 4,

The charge (time interval) of the switching capacitor 8 flows through the main thyristor 1 in the opposite direction, as a result of which the current of the main thyristor decreases to zero.

At time t, the main thyristor 1 goes to non-conducting c. Standby, the load current is closed along the circuit containing the power source E, the load 12, the secondary winding 5 of the double-winding throttle 4, the switching choke 9, the diode 7 and the switching capacitor 8. At the same time, the diode 2 opens, forming an oscillating circuit 8-2-3 -Y-7-8. In the process of oscillating recharging, a part of the voltage of the commuting capacitor 8 is applied to the primary

,

skeins 3 of a two-winding auxiliary switching throttle 4, the secondary winding 5 of which is connected in series to a load circuit connected to a + power source, auxiliary thyristor 6, shunted by a diode 7, a switching capacitor 8 and droplets 9, a reverse diode 10 and an additional circuit of charge 11 a switching capacitor connected between the anode of the auxiliary thyristor and the bus + power supply.

The Converter operates as follows.

By the time t (Fig. 2), the switching capacitor is charged before the supply voltage with the polarity shown in Fig. 1. The pre-charge of the switching capacitor 8 occurs through the charging circuit 11 and in parallel along the circuit containing the load 12, the secondary winding 5 of the double-winding choke 4, the switching choke 9 and the diode 7.

At time t, the auxiliary thyristor 6 is unlocked and a preparatory recharge of the switching capacitor 8 occurs. The preparatory recharge current flows along the circuit 8-6-9-1-8. Due to the presence of diode 7, immediately after the end of the preparatory recharge,

The present invention will allow to expand the range of adjustment of the output voltage of the converter, lower the cost of DC machines, reduce the mass and dimensional parameters due to the possibility of a corresponding commutation recharge of the switching capacitor 8 connected with the choice of the main thyristor 1 parameter and output - the moat of commuting chokes, increase the flow along the contour 8-1-9-7-8. For the operation of the converter of the initial stage of switching, the improvement of the voltage curve of the quadrant is transformed to the secondary winding 5. The voltage on the primary winding of the double-winding compensating throttle 4 is reverse for the main thyristor 1 and necessary for restoring its locking properties.

Counter-wiring of two windings of double-winding droplets 4 removes the switching overvoltage on the load created by the winding 3. By the end of the oscillatory overcharge (time tj), diode 2 is closed and the stage of charging the switching capacitor by E-12-5- 9-7-8-E, as well as through a dosage circuit and 11.

At time t, the voltage on the capacitor 8 is equal to the supply voltage E. The reverse diode 10 is unlocked. The voltage on the capacitor is fixed at level E, the load current is closed around the circuit 12-5-9-10-12.

In the continuous-conduction mode of the main thyristor, the voltage on the switching capacitor is maintained at level E due to its dose through circuit 11.

The present invention will allow to expand the range of adjustment of the output voltage of the converter, lower the cost of DC machines, reduce mass-dimensional parameters due to the possibility of matching its choice of the ratios of the parameters of commutating chokes, increasing the reliability of the converter, by improving the voltage curve applied to to the main thyristor after it is locked (decrease of the voltage jump at the moment of the closing of the d-iod 2).

Claims (1)

Invention Formula power supply and one of the load terminals, the second output of which is connected to the anode of the main thyristor, as well as a switching capacitor, one lining of which is connected directly to the anode of the auxiliary thyristor and connected to the positive output of the pifO source through a dose circuit A DC voltage pulse converter containing a main thyristor shunted by a circuit consisting of a series-connected shunt diode and an auxiliary switch throttle, an auxiliary thyristor which is back-biased by a diode, the anode of which is connected through a commi-t5 and reliability, connected to a circuit the choke with the anode of the main fiber is successively introduced an additional thyristor one-. Auxiliary switching throttle is key to the positive output of the source of villages. tanya and a friend - its lining is connected to the common connection point of the negative source of the power source and the cathode of the main thyristor, characterized in that, in order to extend the range of regulation power supply and to one of the load terminals, the second output of which is connected to the anode of the main thyristor, as well as a switching capacitor, one lining of which is connected directly to the anode of the auxiliary thyristor and connected to the positive output of the power source with reliable power supply through the dosage circuit The additional winding of the auxiliary switching cable receivers is consistently introduced. and to ensure reliability, the auxiliary winding of the auxiliary switching throttle villages was sequentially introduced into the load circuit. tanya and a friend - its lining is connected to the common connection point of the negative source of the power source and the cathode of the main thyristor, characterized in that, in order to extend the range of regulation FIG. 2