Control circuit and power supply for televisions

Abstract

An adaptive feed forward control circuit and power supply for a television comprises a circuit for supplying energy from a source to a load, the load having energy requirements which vary in response to an input signal, for example a video signal. A feedback circuit generates a first correction signal indicative of a difference between an operating voltage or current level and a reference level. A neural network generates a second correction signal indicative of anticipated energy requirement variation by processing information in present values of the input signal. A control circuit, for example a pulse width modulating circuit, is responsive to the correction signals for controlling operation of the energy supplying circuit. The first and second correction signals are combined by a summing circuit. The neural network comprises a first signal adaptive circuit for the input signal and a second signal adaptive circuit for a processed version of the input signal. The processed input signal is linearly independent of the input signal to avoid redundancy in the weight factors. The square root of the input signal, for example, is appropriate for a switched mode power supply. The combination of outputs from the first and second signal adaptive circuits defines the second correction signal. A microprocessor can embody the neural network and provide the processed version of the input signal. The microprocessor can also embody the feedback circuit. The predictive correction signal can be adjusted responsive to the size and polarity of the energy requirement variation.