The inverter has high voltage gain which results in low conduction losses and voltampere rating of inverter switches. The inverter does not have self-current limiting capability against an output short circuit. However, as explained earlier in the discussion of the series-parallel inverter, it is relatively simple to make this circuit short circuit proof. The inverter has a higher count of resonant components than either parallel or series-parallel topology. However, the total volt-ampere rating of the resonant components in all three inverter configurations is almost the same for a given output power. The main disadvantage of this topology is that the parallel resonant branch has constant circulating current losses. Therefore, to keep these losses low the reactive components of the parallel branch should be very efficient. The hybrid resonant inverter is best suited for pulse power application. 4 DC/DC Converter Systems This section presents high frequency DC/DC converters for high power space applications. In a DC power distribution system these converters are required to perform either one or a combination of the following functions: (1) To change the voltage level. (2) To provide a regulated power bus. (3) To provide transformer isolation. (4) To charge and discharge the batteries. (5) To improve the power quality. 4.1 Design Driving Factors Figure 15 shows some typical design driving factors for DC/DC converters. Both input and output requirements determine the complexity, efficiency, mass, volume, and reliability of these converters. The following are main design objectives of DC/DC converters: (1) Low mass and volume. (2) High efficiency. (3) Low switching stresses and EMI. (4) Controlled output voltage. (5) Simple power and control circuitry.
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