| 摘要 |
PURPOSE: A three-phase converter system for protecting an open phase and a control method thereof are provided to protect internal elements of a converter by stably controlling the converter even if an open phase is generated at one or more phases among three phases. CONSTITUTION: A converter is formed with an IGBT(Insulated Gate Bipolar Transistor) bridge type for converting a three-phase AC(Alternating Current) power source into a DC(Direct Current) power source. A switching element performs a switching operation according to the voltage of a DC link part. A heat-emitting element is connected with the switching element and emits power as heat in case the switching element is turned on. If Vq, which is a q-axis voltage obtained by converting a three-phase AC power source through a stationary coordinate system and a rotary coordinate system, is out of a preset reference range, an open phase determination part outputs an open phase signal. An open phase processing part receives the open phase signal and then turns off a controller of the converter and determines whether the Vq is in the preset reference range and then controls the switching operation of the switching element. [Reference numerals] (AA) Voltage of DC link part; (BB) Current(load→DC link part); (CC) FlagSet switching element |
