Influencing Factors in Frequency Response Simulation of HE-boost Converter

In this paper, a continuous input and output current step-up converter, HE-boost, is investigated. As a battery discharge regulator, this kind of converter is beneficial to reducing the working stress and extending the service life of the spacecraft battery. Moreover, its control loop is easier to design and stabilize than the superboost converter and overcomes the difficulty of current sampling spike in Weinberg converter. The topology is analyzed and the influencing factors on the frequency response simulation are studied. These factors include parameter deviation of compensator components, nonideality of power source and load, parasitic parameters of components in power topology, and the delay introduced by the switch driving circuit and current sampling circuit. The factors are measured and added to the simulation model. For comparison, a dual loop controlled HE-boost converter is set up, with an input voltage of 57-90V, an output voltage of 100V, and an output current of 18A. The frequency response characteristics are measured under different load conditions. Comparing the result of the physical converter and simulation, it is shown that the actual parameters of the components of loop compensators and the impedance of power source and load have significant effects on frequency characteristics.