Variable current controller
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsYoshiki Ono, Jun Someya, Yoshiaki Okuno
Life of this patent
Estimating the term…
Abstract
In a period from temporal storage of a video signal to reading and displaying of the video signal, an average value 121 of the brightness levels obtained from a video signal before the video signal is stored in a storage means 3 and a predetermined target value 122 are used to perform a calculation by using a proportionality term and an integration term so that a quantity of limited electric currents is obtained. Moreover, the quantity of limited electric currents is provided with a non-response region or a hysteresis characteristic.
Claims16
An apparatus for controlling a variable current comprising:
- a field delayer having a controlled variable as an input and the controlled variable, being delayed by one field period, as an output;
- a multiplier having an average value of a signal and the controlled variable, which is delayed by one field period, as inputs and a predicted value as an output;
- a deviation detector having the predicted value and a target value as inputs and a deviation signal as an output;
- a proportionality term calculator having the deviation signal and a response characteristic parameter as inputs and proportionality-term data as an output;
- an adder having the proportionality-term data and the delayed controlled variable as inputs and a modified controlled variable as an output;
- and
- a limiter having the modified controlled variable as input and a further modified controlled variable as an output controlled variable, wherein the output controlled variable is input to said field delayer as an input controlled variable.
A method for controlling a variable current, said method comprising the steps:
- delaying an input controlled variable by one field to obtain a controlled variable delayed by one field;
- obtaining a predicted value based on an average value and said delayed controlled variable delayed by one field;
- obtaining a deviation signal based on a target value and said predicted value;
- obtaining a proportionality-term data based on a response characteristic parameter and said deviation signal;
- obtaining a modified controlled variable based on said proportionality-term data and said controlled variable delayed by one field;
- processing said modified controlled variable to obtain a further modified controlled variable;
- and
- using said modified controlled variable as an input controlled variable in said delaying step.
Dependencies are inferred from the claim text.