Patent ID: 9608438
Date: 2017-03-28
CPC Classifications: H01L,H02J,Y02E

Claim:
1. An inverter system comprising: a first photovoltaic panel; a first inverter including a first switch and a first controller, wherein the first inverter is connected to the first photovoltaic panel; a second photovoltaic panel; and a second inverter including a second switch and a second controller, wherein the second inverter is connected to the second photovoltaic panel; wherein according to output values of the first and second photovoltaic panels, through on/off method of the first and second switches, all of the outputs of the first and second photovoltaic panels are applied to the first inverter, or the output of the first photovoltaic panel is applied to the first inverter and the output of the second photovoltaic panel is applied to the second inverter, wherein the first inverter and the second inverter are connected with a power cable, wherein the first and second switches are operated separately by the first and second controller, wherein the first inverter and the second inverter serve as a master inverter and a slave inverter, respectively, wherein in response to determining that the first inverter has failed, independent operation of the second inverter is performed by fixing a switch to a second inverter side, and wherein to determine whether the first inverter is in operation based on a switch state, a voltage of the second photovoltaic panel is temporarily increased to a value of a photovoltaic panel open voltage, wherein the first switch is located inside the first inverter and is connected to the second photovoltaic panel in order to additionally receive the output of the second photovoltaic panel, and the second switch is located inside the second inverter and is connected between the second photovoltaic panel and the first inverter in order to receive the output of the second photovoltaic panel or switch the output of the second photovoltaic panel to the first inverter to apply the output.