Patent RU-2738956-C1 (RU)
Title: Auxiliary converter with input current correction
Inventor: VOLSKIJ SERGEJ IOSIFOVICH
IPC: G05F1/70
Filed: 2020-06-29
Granted: 2020-12-21
Abstract: FIELD: electrical engineering. 
     SUBSTANCE: invention relates to the field of electrical equipment, namely electric equipment, including power conversion equipment, and is intended for supply of DC loads from high-voltage sources (for example, 3000 V) of single-phase current using input current correction function. Disclosed converter of auxiliary needs with input current correction contains input terminals (1) and (2) connected to input of single-phase rectifier (3), positive output of which is connected to positive input of input voltage sensor (4), and negative output is connected to negative inputs of input voltage sensor (4) and input current sensor (5), input throttle (6), transistor (7), positive terminal (drain or collector) of which is connected to anode of diode (8) and to output of input throttle (6), output capacitor (9) connected to output terminals (10) and (11), as well as control unit (12), to inputs (13) and (14) of which there connected are signal outputs of input voltage sensor (4) and input current sensor (5), at that transistors (16-18) are introduced, diodes (19-21), intermediate capacitors (22-25), voltage inverters (26-29), intermediate transformer (30) and output rectifier (31), wherein positive terminal of transistor (16) is connected to negative terminal of transistor (7) and output of intermediate capacitor (22), other terminal of which is connected to cathode of diode (8), positive terminal of transistor (17) is connected to negative terminal of transistor (16), anode of diode (20) and output of intermediate capacitor (23), other terminal of which is connected to cathode of diode (19), positive terminal of transistor (18) is connected to negative terminal of transistor (17), anode of diode (21) and output of intermediate capacitor (24), other terminal of which is connected to cathode of diode (20), negative terminal of transistor (18) is connected to input of sensor of input current (5) and output of intermediate capacitor (25), other output of which is connected to cathode of diode (21), each input of voltage inverters (26-29) is connected to corresponding intermediate capacitors (22-25), to outputs of voltage inverters (26-29) are connected primary windings of intermediate transformer (30), secondary windings of which are connected to output rectifier (31), which output is connected to output terminals (10, 11), wherein control inputs of transistors (7, 16-18) are connected through driver (32) to output of unit (15) of control unit (12), wherein control unit (12) is a microprocessor board and matching components, which enables to process two analogue signals from voltage (4) and current (5) sensors, convert analogue signals into digital information, processing digital information according to a predetermined algorithm by means of an installed program and generate the required pulse-modulator output signals according to a predetermined algorithm for controlling transistors (7, 16-18). 
     EFFECT: technical result consists in reduction of power losses. 
     1 cl, 1 dwg