Nonlinearity error correction of constant voltage power supply

The paper introduces the basic principle of a kind of constant voltage power supply. A output circuit and a sampling feedback circuit are included in the power supply. There is a big problem between the two circuits, which is obvious nonlinearity error. Some simulation test is done in order to reduce the nonlinearity error. Two methods are presented according to the simulation result. One method is to add a self-adjusting circuit in the sampling feedback circuit, which can reduce the nonlinearity error through hardware. The other method is to add a special program in the soft so that the control signal is adjusted to be nonlinear according to the feedback signal, which can reduce the nonlinearity error through soft. The adjusting process is done repeatedly. The experiments show that the output of the constant voltage power supply ranges from 25 volts to 150 volts. Its error is reduced from original 43 volts to 0.6 volt and its hysteresis is improved greatly.