초록 ▼

Apparatus with rechargeable battery (B), a load (MR) and a power supply (PS) for charging the battery (B). When the load (MR) receives current from the battery (B) the charge consumed by the load (MR) is measured by means of a series resistor (RS) and a voltage-to-frequency converter (VFC). A microc

Apparatus with rechargeable battery (B), a load (MR) and a power supply (PS) for charging the battery (B). When the load (MR) receives current from the battery (B) the charge consumed by the load (MR) is measured by means of a series resistor (RS) and a voltage-to-frequency converter (VFC). A microcontroller (MC) computes the average charge consumed per session of usage and computes the number of remaining sessions of usage from the actual charge in the battery (B) and the average charge per session and shows this number on a display (D).

대표청구항 ▼

[ I claim:] [1.] An apparatus comprising: a rechargeable battery (B); a load (MR); means (ES) for connecting the load (MR) to the battery (B) during a session; means (PS) for charging the battery (B); means (MC, PS) for monitoring the state of charge of the battery (B) and for generating a signal re

[ I claim:] [1.] An apparatus comprising: a rechargeable battery (B); a load (MR); means (ES) for connecting the load (MR) to the battery (B) during a session; means (PS) for charging the battery (B); means (MC, PS) for monitoring the state of charge of the battery (B) and for generating a signal representing a remaining amount of charge in the battery (B), wherein the apparatus further comprises: means (RS, VFC) for measuring a session charge flowing from the battery (B) to the load (MR) during a session; means (MC, S) for counting a number of sessions; first means (MC) for calculating a total charge consumed during the number of sessions; second means (MC) for calculating an average session charge from the total charge and the number of sessions; third means (MC) for calculating a number of remaining sessions from the remaining amount of charge in the battery (B) and the average session charge; and means (D) for displaying the number of remaining sessions.