In this study, hydrogen production system is implemented with resonant converter fed alkaline electrolyzer in order to reduce the limitations imposed by pulse width modulation (PWM) switching at high switching frequencies. The series resonant converter (SRC) is used in the power stage of the system due to its simple structure and decreasing conduction and switching losses with decreasing output current. The steady-state characteristic of SRC is obtained by the state-plane method for operating condition above the resonance frequency. The converter of 400 W is designed. The system consisting of the converter, the control circuit and alkaline electrolyzer is established. The power switches of the converter are driven with frequency modulation (FM) technique and switched on under zero voltage conditions. Unlike PWM converters, it is not necessary to use snubber circuits to reduce switch stresses and high efficiency is obtained by operating over 115 kHz. The amount of hydrogen produced for nominal operating current of electrolyzer and different electrolyte temperatures are calculated theoretically and measured approximately. Hydrogen production value and the energy, Faraday and cell efficiency values of the electrolyzer are presented for the nominal operating current and electrolyte temperature of 50℃.