Device for stabilizing direct current (DC) distribution system
AssigneeLG Electronics Inc.
InventorsSeongju Kim, Mun Seok Seo, Joonsik An
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Abstract
A device for stabilizing a direct current (DC) distribution system includes a capacitor unit charged by a DC voltage supplied by a power supply stage of the distribution system. The device further includes an inverter that has three pair of switching elements. The device also includes a voltage stabilization circuit constructed using one pair out of the three pairs of switching elements in the inverter. The device also includes a controller that controls the voltage stabilization circuit to alleviate instability of a DC voltage generated in a transient period.
Claims20
A device for stabilizing a direct current (DC) distribution system, wherein the system includes a power supply stage, the device comprising:
- a capacitor unit charged by a DC voltage supplied from the power supply stage;
- an inverter unit including two pairs of driving switching elements and a pair of common switching elements, wherein the inverter unit is configured to use the two pairs of driving switching elements to convert the voltage charged in the capacitor unit into an AC power and to provide the AC power to a motor connected to the device;
- a voltage stabilization unit including the pair of common switching elements and at least one passive element, wherein the voltage stabilization unit is configured, based on a charging or discharging signal, to charge the capacitor unit with the DC voltage supplied from the power supply stage or to discharge the voltage charged in the capacitor unit to the power supply stage;
- and
- a control unit configured to compare the DC voltage supplied from the power supply stage with a reference range, and to provide the charging or discharging signal to the voltage stabilization unit based on the comparison result.
Dependencies are inferred from the claim text.