TWO-DIRECTIONAL DOWN CONVERTER OF CONSTANT VOLTAGE Russian patent published in 2012 - IPC H02M3/07 

FIELD: electricity.

SUBSTANCE: two-directional down converter of constant voltage (TVDC) can be used as high-voltage dc-dc converter of average capacity in systems of direct current electric equipment, for example for direct current electric locomotives with voltage of 3 (1.5) kV for power supply from contact system with increased voltage (12 (6) kV, 18 (9) kV, etc.), so that galvanic isolation of supply mains and load is provided. The proposed TVDC with ratio of high voltage value to amplitude of voltage pulses of primary winding of transformer, which is equal to K, where K - even number which is higher than two, includes 3·(K-1) switches formed with opposite parallel connection of valve with complete control and diode, one two-directional completely controlled switch, K capacitors used at the same voltage polarity, transformer having one primary winding and one secondary winding, and rectifier which is used at increased frequency and which is reversible as to current.

EFFECT: two-directional down converter of constant voltage uses insulation load more effectively owing to providing galvanic isolation of supply mains and load, which leads to improvement of insulation reliability of output chains of converter and load.

2 dwg