Digital power meter apparatus and method for the same
AssigneeFortune Semiconductor Corporation
InventorsYi-Chou Huang, Kou-Yuan Yuan, Arthur Shaoyan Rong
Life of this patent
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Abstract
A digital power meter apparatus and the method for the same are proposed. The input voltage signal and input current signal through dual channels are processed at a first stage to obtained a first digital signal. The first digital signal is sent to a third low-pass filter. The input voltage signal and input current signal are processed in a second-stage processing through a first low-pass filter, a second low-pass filter and a second logic operation unit to obtain a second digital signal. A third logic operation unit processes the first digital signal and a second digital signal in order to obtain a digital power signal proportion to the product of the two input signals.
Claims9
A digital electrical power meter, comprising
- a first input channel and a second input channel for receiving a first analog input signal and a second analog input signal, respectively;
- a first signal conversion unit and a second signal conversion unit connected to the output of the first input channel and a second input channel and converting the first analog input signal and the second analog input signal into corresponding digital signals;
- a first frequency-down filter unit and a second frequency-down filter unit connected to the first signal conversion unit and the second signal conversion unit, respectively and used to filter the corresponding digital signals;
- a first logic operation unit having two input ends connected to the output of first frequency-down filter and the output of the second frequency-down filter unit;
- a third low-pass filter connected to the output of the first logic operation unit in order to filter the output of the first logic operation unit;
- a first low-pass filter and a second low-pass filter connected to the output of the first frequency-down filter unit and the second frequency-down filter unit, respectively;
- a second logic operation unit processing the output signal from the first low-pass filter and the second low-pass filter;
- and
- a third logic operation unit performed a subtracting operation between the output from the first logic operation unit and the second logic operation unit to obtain a digital power signal proportion to the product of the first analog input signal and the second analog input signal.
Dependencies are inferred from the claim text.