Easy current slope detection for low cost implementation of the direct adaptive current control for DC-DC-converters

"Direct Adaptive Current Control" (DACC) is a completely adaptive current control scheme with excellent control quality and high dynamics. It is based on the detection of the current slopes during each switching state of the utilized inverter and identifies the system within one period. No control path parameters are needed for setup. One method to measure the current slopes is fast oversampling of the current followed by a least squares estimator to filter the noise. This is well-proven but is difficult at high switching frequencies and implies the use of powerful hardware. In this paper a new algorithm for the detection of the current slopes in DC/DC-Converters is presented that does not need oversampling or a complex filter. Its simplicity allows for easy implementation in low-cost microcontrollers and yet be operated at high switching frequencies. The presented algorithm enables the implementation of the DACC as a low-cost, high dynamic and completely adaptive current controller for fast-switching DC/DC-Converters.