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A novel half-bridge LLC DC-DC Resonant Converter for high power DC power supply is presented in this paper. The design consideration of resonant tank circuit paramerters are presented. The DC gain characteristics of the proposed converter is analyzed from its complex DC gain equation. First the performance of the converter is analyzed through simulation. The proposed converter operate with higher frequency of operation and from the light load to full load point in characteristics ZVS/ZCS (zero voltage switching/zero current switching) turn on and low current turn off is achieved in variable frequency open-loop control range. An experimental prototype of 2.1 kW has been built according to the parameters consideration and calculated tank circuit parameters. Variable frequency control is implemented through DSP for the regulation of output voltage in open-loop. The converter maintains ZVS in the entire range of open-loop control from 5 to 15 kHz.