发明名称 |
TRANSFORMERLESS MULTI-LEVEL MEDIUM-VOLTAGE UNINTERRUPTABLE POWER SUPPLY (UPS) SYSTEM |
摘要 |
Systems and methods for supplying power at a medium voltage from an uninterruptible power supply (UPS) to a load without using a transformer are disclosed. The UPS includes an energy storage device, a single stage DC-DC converter or a two-stage DC-DC converter, and a multi-level inverter, each of which are electrically coupled to a common negative bus. The DC-DC converter may include two stages in a unidirectional or bidirectional configuration. One stage of the DC-DC converter uses a flying capacitor topology. The voltages across the capacitors of the flying capacitor topology are balanced and switching losses are minimized by fixed duty cycle operation. The DC-DC converter generates a high DC voltage from a low or high voltage energy storage device such as batteries and/or ultra-capacitors. The multi-level, neutral point, diode-clamped inverter converts the high DC voltage into a medium AC voltage using a space vector pulse width modulation (SVPWM) technique. The UPS may also include a small filter to remove harmonics in the AC voltage output from the multi-level inverter. |
申请公布号 |
US2015188362(A1) |
申请公布日期 |
2015.07.02 |
申请号 |
US201514594073 |
申请日期 |
2015.01.09 |
申请人 |
Mondal Subrata K. |
发明人 |
Mondal Subrata K. |
分类号 |
H02J9/06;H02M3/156 |
主分类号 |
H02J9/06 |
代理机构 |
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代理人 |
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主权项 |
1. A transformerless uninterruptible power supply for an electrical load, comprising:
an energy storage device; a two-stage DC-DC converter; and a multi-level inverter outputting a medium AC voltage, wherein a negative terminal of the energy storage device, a negative terminal of the two-stage DC-DC converter, and a negative terminal of the multi-level inverter are electrically coupled to a common negative bus. |
地址 |
South Windsor CT US |