A Variable Off-Time Control Method for a Single-Phase DCM Microinverter
A Variable Off-Time Control Method for a Single-Phase DCM Microinverter
复制标题
单相DCM微型逆变器的可变关断时间控制方法
DOI:
10.1109/tpel.2017.2759227
复制
发表时间:
2018-08
影响因子:
6.7
通讯作者:
Shuai Shao
中科院分区:
文献类型:
--
作者:
Zhen Zhang;Junming Zhang;Shuai Shao
This paper proposes a variable off-time control method for a single-phase microinverter operating in the discontinuous conduction mode (DCM) for efficiency improvement. First, the fixed off-time control method is analyzed. The concept is to fix the off-time of the active switch throughout a line cycle for all output powers and scale the on-time of the active switch to shape a sinusoidal output current. Then, based on the fixed off-time control method, a variable off-time control method is proposed to modulate the preset fixed off-time in order to decrease the switching frequency during ac line zero-crossings and light load conditions. Compared with existed fixed-frequency DCM control or boundary conduction mode control, the variable off-time control is more flexible to optimize the efficiency under different load conditions as the switching frequency range can be automatically adjusted according to the output power. The switching frequency is high at heavy loads to limit the maximum peak current and is low at light loads to increase the light load efficiency. In addition, a predictive on-time method is adopted to simplify inverter control and reduce hardware costs. The parameter design principle is detailed in this paper. A 300 W prototype is built to verify the performance of the proposed method.
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DOI:
10.1109/aupec.2013.6725465
发表时间:
2013-09
期刊:
2013 Australasian Universities Power Engineering Conference (AUPEC)
影响因子:
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影响因子:
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影响因子:
6.7
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DOI:
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发表时间:
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期刊:
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影响因子:
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