An Adaptive Digital PID controller scheme for power converters

Abstract

An Adaptive Digital PID (AD-PID) controller scheme is presented in this paper in order to improve the dynamic performance of power converters. The controller adaptively adjusts the integral constant ( i K ) and the proportional constant ( p K ) based on the amount of change in the error signal caused by the load transient and following a control law. The AD-PID controller results in dynamic output voltage deviation reduction and in shorter settling time. The AD-PID controller concept and architecture and its proposed control law are presented in this paper and verified by experimental results obtained from a proof-of-concept experimental prototype.

Dynamic Response Improvement Based on PID Control

“…In the literatures (14)- (16) , the parameters of the PID controllers are dynamically tuned, so as to upgrade the load transient responses. According to various feedback errors, the parameters of the PID controllers are altered.…”

“…In (15), there is a given error reference, and accordingly, during the load transient period, if the output feedback voltage error is larger than this given value, then the parameters of the PID controller are fixed; otherwise, the parameters K P and K I are set to zero, thereby causing the steady-state error to appear in the output voltage. Besides, in each of the literatures (14)- (16) , only a single quiescent operating point is taken on experiments, without considering different values of voltages and currents.…”

DC-DC power converter with a modified control scheme to improve load transient response

“…The popularity of DC-DC power switching converters have been growing in recent decade for use in a wide variety of application, such as LEDs, car electronics, portable devices and computing platforms, among others [1][2][3], due to their high efficiencies compared to their linear regulators counterpart, among other reasons.…”

Dynamic digital variable switching frequency control scheme for power converters

“…The method in [15] utilizes an analog control law that varies the amplitude of the ramp signal dynamically while maintaining constant switching frequency in order to improve the dynamic performance of a power converter. The methods in [16] and [17] utilize the adjustment of the PID controller constants in order to improve the transient performance. The methods in [18] utilizes a hysteretic control that switches the compensators used during the steady state and transient in order to improve the performance of the converter during transient.…”