Battery voltage detector
AssigneeCanon Kabushiki Kaisha
InventorHiroshi Takahashi
Life of this patent
Estimating the term…
Abstract
A device for detecting a voltage of a battery for use in electronic apparatus and appliances, the detector being constructed with a display device which include segments to display input data and processed data and segments to display particular data; a time-division signal output device to produce time-division output signals for driving the display device in a time-division mode; a voltage detector to detect a voltage of a source battery in synchronism with the time-division output signals from the time-division signal output device; a voltage comparator to compare the battery voltage as detected by the voltage detector with a reference voltage; and a segment driver to drive the segments which have been pre-selected from the segments in the display device based on the result of comparison by the voltage comparator.
Claims17
A battery voltage detector powered by a source battery, comprising:
- (a) display means having a plurality of segments;
- (b) time-division signal output means for putting out time-division signals for driving said plurality of segments in said display means in a time-division mode;
- (c) voltage detecting means for detecting the voltage of the source battery in response to said time-division signals output from said time-division signal output means;
- (d) means for producing a reference voltage;
- (e) voltage comparison means for comparing the battery voltage as detected by said voltage detecting means with said reference voltage;
- and
- (f) segment driving means for driving at least one segment preselected from said plurality of segments based on the result of said comparison by said voltage comparison means.
A battery voltage detector powered by a source battery, comprising:
- (a) means for generating time-division driving signals;
- (b) display means including indicia for displaying information in a time-division mode in response to said time-division driving signals;
- (c) voltage detecting means for detecting the voltage of the source battery in response to one of said time-division driving signals;
- (d) means for generating a reference voltage;
- (e) voltage comparison means for comparing a voltage value detected by said voltage detecting means with said reference voltage;
- and
- (f) driving means for driving preselected indicia in said display means based on the result of comparison by said voltage comparison means.
A battery voltage detector powered by a source battery, comprising:
- (a) display means comprising display elements for a plurality of numerical places;
- (b) a display control circuit for putting out driving signals for driving said display elements in said display means and for putting out time-division signals for driving numerical places in said display means;
- (c) voltage detecting means for detecting a voltage of a power source battery in response to said time-division signals;
- and
- (d) driving means for driving pre-selected display elements in said display means in accordance with a voltage detected by said voltage detecting means.
A battery voltage detector powered by a source battery, comprising:
- (a) display means comprising a plurality of display segments;
- (b) time-division signal output means for putting out time-division signals for driving said display means;
- (c) voltage detecting means for detecting a voltage of the source battery in response to at least one-time division signal of said time-division signals;
- and
- (d) display driving means for driving pre-selected segments of said plurality of segments of said display means in accordance with the voltage detected by said voltage detecting means.
A battery voltage detector powered by a source battery, comprising:
- a display device having segments for displaying input data and processed data, and segments for displaying particular data other than input data and processed data;
- time-division signal output means for producing time-division signals for driving said segments of said display device in a time-division mode;
- switching means operable in response to a time-division signal from said time-division signal output means;
- load means for conducting an electric current from the source battery by switching operation of said switching means;
- means for producing a reference voltage;
- voltage comparison means for comparing a voltage applied to said load means with said reference voltage;
- and
- segment driving means for driving at least one preselected segment of said segments of said display device based on the result of comparison by said voltage comparison means.
A battery voltage detector powered by a battery, comprising:
- means for producing a time-division driving signal;
- a display device having a plurality of segments for displaying information in a time-division mode in response to the time-division driving signal;
- switching means operable in response to said time-division driving signal;
- load means for applying an electric current supplied from said battery by switching operation of said switching means;
- means for producing a reference voltage;
- voltage comparison means for comparing a voltage applied to said load means with said reference voltage;
- and
- segment driving means for driving at least one preselected segment of said plurality of segments based on the result of comparison by said voltage comparison means.
A battery voltage detector powered by an electric source voltage, comprising:
- display means having a plurality of segments;
- means for producing a time-division signal for driving said plurality of segments of said display means;
- switching means operable in response to said time-division signal;
- load means for conducting an electric current when the electric source voltage is applied to said load means by said switching means;
- means for producing a reference voltage;
- comparison means for comparing one of a voltage drop by said load means and said electric source voltage with said reference voltage;
- and
- segment driving means for driving at least one selected segment from among said plurality of segments based on the result of comparison by said comparison means.
A battery voltage detector powered by an electric source voltage, comprising:
- means for producing a signal;
- switching means operable in response to said signal for applying said electric source voltage;
- load means for conducting an electric current when the electric source voltage is applied by said switching means;
- means for producing a reference voltage;
- comparison means for comparing one of a voltage drop by said load means and said electric source voltage with a reference voltage;
- and
- display means having a plurality of segments for displaying the result of comparison by said comparison means.
Dependencies are inferred from the claim text.