Sequential Switching Shunt Regulation Using DC Transformers for Solar Array Power Processing in High Voltage Satellites

This article proposes a solar array regulation technique for a high-voltage satellite power bus. The regulation method combines on-off control at low frequency, i.e., kHz range, of highly efficient isolated and unregulated dc-dc converters operating at high frequency, i.e., hundreds of kHz. Although this technique can adopt different implementations, this article deals with a hysteretic voltage control loop at low frequency, also known sequential switching shunt regulator (S3R), and unregulated, isolated, current-fed, zero-voltage, and zero-current push-pull dc-dc converters. Design guidelines and experimental validation are provided.