SU384178A1 - CONSTANT VOLTAGE CONVERTER - Google Patents

Description

The invention relates to industrial electronics and can be used in power supply devices for automation units, communications equipment and motors of a constant gok.

DC-converter circuits are known that contain power and auxiliary controlled gates, a discharge diode and a capacitive switching node. However, known converters have large switching losses.

The purpose of the invention is to eliminate this drawback. This is achieved by the fact that in a thyristor converter of direct voltage, a two-winding transformer with two windings connected to opposite ends in series with an auxiliary controlled valve is inserted into the capacitive switching node, and the opposite ends of the windings are connected to the output buses through diodes in the conductive direction.

The drawing shows the electrical circuit of the proposed constant voltage thyristor converter.

The converter contains a power controlled valve /, a discharge diode 2, auxiliary controlled valve 3, a capacitive switching node (capacitor 4, inductance 5, diode b), and a pulse transformer

2

7 with windings S and 9, separation diode Yu,

charge diode //, limiting resistor

12, boosting capacitor 13 and load M.

When a voltage is applied, the forcing capacitor 4 is charged through the inductor 6, the winding 8 of the impulse transformer 7, the diode 10 and the load 14. In the idling state of the converter, the capacitor 4 is charged through the inductance 5, the winding

9 charge diode //. resistor 12.

The charging diode // is turned on to prevent the discharge of the capacitor 4 in the operating modes when the capacitor 4 is charged before the voltage is higher than the input voltage. To lock

The main valve / power circuit turns on the bypass thyristor 3, and since the resistor 12 is clamped by the boost capacitor 13, an input voltage is applied to the winding 9 of the pulse transformer 7, which is transformed into the winding 8 by turning off the main valve / power circuit. The load current goes to the circuit, shunting the power thyristor / and consisting of shunt thyristor 3, winding 8 of the pulse transformer 7, diode W.

Simultaneously with the inclusion of the bypass thyristor 3, the capacitor 4 is recharged at the time of changing the polarity of the voltage on the capacitor 4 its discharge current is turned off

thyristor 5. Thus, it is provided

3

disconnecting the load from the filament source by switching the load current to the shunt circuit at the time when the main valve is turned off and then the shunt thyristor is turned off.

Subject invention

DC / DC converter containing power and auxiliary circuit 4

equal voltage, split day diode and capacitive switching node, different heme, that, in order to reduce switching losses, a pulse transformer with two windings connected with opposite ends in series with an auxiliary control valve was inserted into the node of the switching capacitance, with opposite ends The windings through the diodes in the conductive direction are connected to the output busbars.

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