Patent ID: 9614460
Date: 2017-04-04
CPC Classifications: H02M

Claim:
1. A voltage compensating method applied to a converter that converts a DC voltage into an AC voltage, outputs the AC voltage to an external AC power source, and comprises a first switch module, a second switch module, and an inductor, the voltage compensating method comprising: detecting a first current value related to the inductor during a first dead time period; calculating a second current value and a third current value related to the inductor, according to the first current value; determining an output mode of the converter after the first dead time period according to polarities of the first current value, the second current value and the third current value, the output mode of the converter indicating a voltage compensation model; calculating a voltage compensation value according to the voltage compensation model, the first current value, and the second current value or the third current value; and adjusting a switching time for the first switch module and the second switch module according to the voltage compensation value during a second dead time period; wherein said adjusting the switching time for the first switch module and the second switch module according to the voltage compensation value comprises: when a switched-on time point of the first switch module is later than a preset switched-on time point during the first dead time period, calculating a switched-off time point of the first switch module in the second dead time period according to the voltage compensation value; and during the second dead time period, adjusting the switched-off time point of the first switch module to be later than a preset switched-off time point to delay switching off the first switch module, wherein the voltage compensation value increases by a voltage on the inductor during the delay of switching off the first switch module.