Characterization of AC mains circuit parameters
First Claim
Patent Images
1. An image forming device, comprisinga variable electrical load;
- a controller adapted to vary the electrical load based on a characterization of AC mains circuit parameters including source voltage and line impedance; and
wherein line impedance is determined from characterizing electrical signals measured at a minimal load configuration after determining a change in source voltage.
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Abstract
Methods, devices, and systems implementing AC mains circuit parameter characterization are provided. One example embodiment of an image forming device includes a variable electrical load, and a controller adapted to vary the electrical load based on a characterization of AC mains circuit parameters including source voltage and line impedance wherein line impedance is determined for a change in source voltage.
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Citations
24 Claims
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1. An image forming device, comprising
a variable electrical load; -
a controller adapted to vary the electrical load based on a characterization of AC mains circuit parameters including source voltage and line impedance; and wherein line impedance is determined from characterizing electrical signals measured at a minimal load configuration after determining a change in source voltage. - View Dependent Claims (2, 3, 4)
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5. A method of characterizing AC mains circuit parameters, comprising:
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measuring root mean square (RMS) values of characterizing electrical signals to a pulse width modulated (PWM) load at a first load; measuring RMS values of characterizing electrical signals to the PWM load at a second PWM load; extrapolating the RMS values of characterizing electrical signals for the PWM load at the second PWM load, to values for a PWM load at third PWM load; and determining AC mains circuit parameters using changes in RMS values of characterizing electrical signals between PWM loading at the first load and the third PWM load. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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14. A device, comprising:
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at least some pulse width modulation (PWM) electrical load; a controller for characterizing AC mains circuit parameters and modulating the PWM electrical load based on the characterization; and wherein the characterization includes; measuring root mean square (RMS) electrical signal values to the device at 0% PWM loading and X % PWM loading, X being greater than 0; determining RMS electrical signal values at 100% PWM loading from the measured RMS electrical signal values; and solving for AC mains circuit parameters from the change in RMS electrical signal values from 0% to 100% PWM loading. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An image forming device, comprising
a variable electrical load; -
a controller adapted to vary the electrical load based on at least two AC mains circuit characterizing electrical signals measurements, wherein the electrical signals measurements include source voltage and line impedance; and wherein the measurements are arranged to coincide with at least two different known load configurations, wherein at least one load configuration is a minimal load configuration, the different load configurations being held constant at least during the measurements, and wherein line impedance is determined from characterizing electrical signals measured at the at least one minimal load configuration after determining a change in source voltage.
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Specification