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Design and Development of Space Borne Multiple Output DC DC Converter with Bias Feedback Using Voltage Feedforward Control Technique

This paper gives a summary of design and hardware development of consistent and vigorous space borne power supply unit for synthetic aperture radars with the variation of input voltage of 24V to 38V. The available battery raw bus voltage in satellite is 28V DC nominal. This power supply unit can use for various radio frequency (Exciter and Receiver) and digital circuits (processor). The power supply unit (PSU) consists of two converters in which the converter-1 consist of single output of 15V/0.6A and converter-2 consists of three outputs of +5.3V/12A, +5.4V/4.5A & -5V/0.6A. The total output power of PSU is 100.4W with the input voltage variation of 24V to 38V DC (28V DC nominal) at an operating frequency of 140 KHz. The power supply unit is implemented by using single switch Forward Converter Topology with saturable inductor and Low Drop out (LDO) as post regulators is used to get the required regulated outputs. The PSU has been designed and developed with bias feedback using Voltage mode feed forward control technique.