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US 6,473,699 B2Granted
Power arithmetic apparatus
AssigneeKabushiki Kaisha Toshiba
InventorRyoji Maruyama
Life of this patent
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Abstract
Power arithmetic apparatus detects a first variation amount of a voltage in proportion to a voltage of a measuring object and a second variation amount of a voltage in proportion to a current of the measuring object, and calculates power of the measuring object based on the first variation amount detected and the second variation amount detected.
Claims17
A power arithmetic apparatus comprising:
- means for detecting a first variation amount in a voltage in proportion to a voltage of a measuring object and a second variation amount in a voltage in proportion to a current of the measuring object;
- and
- means for calculating power of the measuring object based on the first variation amount detected and the second variation amount detected;
- wherein the means for detecting the first variation amount and second variation amount comprises:
- a first converter for converting the voltage in proportion to the voltage of the measuring object to a first digital signal indicating the voltage in proportion to the voltage of the measuring object;
- a second converter for converting the voltage in proportion to the current of the measuring object to a second digital signal indicating the voltage in proportion to the current of the measuring object;
- a first counter for outputting the first variation amount based on the first digital signal;
- and
- a second counter for outputting the second variation amount based on the second digital signal.
6 more elements
A power arithmetic apparatus comprising:
- means for detecting a first variation amount in a voltage in proportion to a voltage of a measuring object and a second variation amount in a voltage in proportion to a current of the measuring object;
- means for calculating power of the measuring object based on the first variation amount detected and the second variation amount detected;
- a selector for alternately outputting the first variation amount detected and the second variation amount detected in synchronization with a clock signal;
- wherein the means for detecting the first variation amount and second variation amount comprises:
- a first converter for converting the voltage in proportion to the voltage of the measuring object to a first digital signal indicating the voltage in proportion to the voltage of the measuring object;
- a second converter for converting the voltage in proportion to the current of the measuring object to a second digital signal indicating the voltage in proportion to the current of the measuring object;
- a first counter for outputting the first variation amount based on the first digital signal;
- and
- a second counter for outputting the second variation amount based on the second digital signal;
- and
- data selecting means for alternately selecting outputs from the first and second counters;
- addition/subtraction means for performing addition/subtraction between last output data from the addition/subtraction means and output data from the data selecting means;
- and
- switching means for switching the addition/subtraction means between addition and subtraction in accordance with the first and second digital signals output from the first and second converters.
11 more elements
A power arithmetic apparatus comprising:
- means for detecting a first variation amount in a voltage in proportion to a voltage of a measuring object and a second variation amount in a voltage in proportion to a current of the measuring object;
- means for calculating power of the measuring object based on the first variation amount detected and the second variation amount detected;
- wherein the means for calculating power of the measuring object is cleared at a predetermined timing;
- wherein the means for detecting the first variation amount and second variation amount comprises:
- a first converter for converting the voltage in proportion to the voltage of the measuring object to a first digital signal indicating the voltage in proportion to the voltage of the measuring object;
- a second converter for converting the voltage in proportion to the current of the measuring object to a second digital signal indicating the voltage in proportion to the current of the measuring object;
- a first counter for outputting the first variation amount based on the first digital signal;
- and
- a second counter for outputting the second variation amount based on the second digital signal;
- and
- data selecting means for alternately selecting outputs from the first and second counters;
- addition/subtraction means for performing addition/subtraction between last output data from the addition/subtraction means and output data from the data selecting means;
- and
- switching means for switching the addition/subtraction means between addition and subtraction in accordance with the first and second digital signals output from the first and second converters.
11 more elements
Dependencies are inferred from the claim text.