The paper considers the features of developing high-voltage power supplies that operate on a pulse load with operating time of tens of microseconds and repetition period of tens to hundreds of microseconds. We describe the main difficulties that arise in products where the basic task of the power supply source is to charge the output storage capacitor during the intervals between the load switching pulses. We show constraints and restrictions that affect the duration of the transient process of the storage device charge. After listing the ways to overcome them, we propose a new method, which consists in dividing the initial power supply into two complementary ones. Each of the supplies implements its own strictly defined functions, allowing to optimize the efficiency and size of the entire device, reduce the cost and weight of development. We present waveforms of output voltage and transient processes caused by load changes. We describe construction features of a control system that meets the proposed method for building a high-voltage power supply, its physical layout and the results of its operation.