| 摘要 |
A system for providing an accurate indication of the remaining life of a battery. The system includes a first circuit that provides a control signal (46). A second circuit employs an internal resisitance value of the battery (34) and a battery voltage to provide the indication of remaining battery life in response to the control signal. In a specific embodiment, the second circuit includes a third circuit (36) that measures the internal resistance of the battery in response to the control signal. The third circuit also includes a circuit for measuring an output current and an output voltage of the battery (34) at varying battery loads. The circuit for measuring an output current includes an ammeter (40) and a switching load (42). In a more specific embodiment, the switching load (42) is implemented as a transmitter that is selectively activated via the control signal. A fourth circuit, included in the second circuit, provides the indication of remaining battery life in response to the internal resistance. The fourth circuit also includes a circuit for selecting a battery discharge curve in accordance with the internal resistance. Software running on the first circuit generates the estimate based on the discharge curve, which is subsequently displayed via a display. |
