Abstract: The application describes a method for operating an electrolyzer to generate hydrogen from water using an electrolysis reaction, supplied with power from an AC grid via an actively controlled rectifier circuit. The method includes operating the electrolyzer in a normal operating mode with an input voltage UEI above a no-load voltage ULL with predominantly ohmic behavior, operating the electrolyzer in a standby operating mode with an input voltage UEI below the no-load voltage ULL with predominantly capacitive behavior, and transitioning from the standby operating mode to the normal operating mode during a first transition duration ?t1, wherein the first transition duration ?t1 is reduced by keeping the input voltage UEI at the electrolyzer input during the standby operating mode above a first voltage threshold value UTH,1 different from 0V. The application furthermore describes a connection circuit, an actively controlled rectifier circuit and an electrolysis system for performing the method.

Abstract: The application describes a method for operating an electrolyzer to generate hydrogen from water using an electrolysis reaction, supplied with power from an AC grid via an actively controlled rectifier circuit. The method includes operating the electrolyzer in a normal operating mode with an input voltage UEI above a no-load voltage ULL with predominantly ohmic behavior, operating the electrolyzer in a standby operating mode with an input voltage UEI below the no-load voltage ULL with predominantly capacitive behavior, and transitioning from the standby operating mode to the normal operating mode during a first transition duration ?t1, wherein the first transition duration ?t1 is reduced by keeping the input voltage UEI at the electrolyzer input during the standby operating mode above a first voltage threshold value UTH,1 different from 0 V. The application furthermore describes a connection circuit, an actively controlled rectifier circuit and an electrolysis system for performing the method.