NOVELTY - The system has digital feedback circuit that generates first control signal related to the voltage and current at the input or output of DC-DC converter. The analog feedback circuit processes the first control signal and voltage and current values of input source to generate other control signal for PWM generator within the converter.    USE - Control system for pulse width modulation (PWM) based direct current-direct current (DC-DC) converter, standard boost type converter and buck type converter for conveying and maximizing power generated by input source of solar panel and fuel cell to load of passive capacitor, or super capacitor, accumulator and rechargeable battery.    ADVANTAGE - The analog feedback circuit can respond to sudden changes in the operation conditions of input source so that the analog feedback circuit can bring the operating point of DC-DC converters close to the target point without waiting for the digital feedback circuit to respond to change in operating conditions while improving the dynamic integral efficiency. The programmable digital controller can easily switch between the user-selectable predefined maximum power point tracking algorithms without interrupting the operation of converter. The nose performance of control system can be improved. Several types of batteries and loads can be charged effectively. The efficiency of control system can be improved. The inherent efficiency of DC-DC converter is not affected by the control loop. The stability of control system can be improved. The digital loop enhances the accuracy of the system and allows the implementation of various maximum power point tracker (MPPT) algorithms depending on various factors such as parameters of primary source, and environmental conditions such as illumination and temperature. The digital loop facilitates the integration of additional control and monitoring features. The output power of system can be monitored and maximized effectively.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the control system.    Input voltage of converter (Vin)    Output voltage of converter (Vout)    Reference voltage of converter (Vref)