Battery Presence Detection Using Pulse Signals

The patent applies periodic pulsed action instead of continuous voltage divider operation. A control circuit periodically activates the voltage divider and comparator only when battery presence needs to be checked, rather than maintaining continuous operation. This periodic activation significantly reduces power consumption while maintaining adequate detection reliability through timed sampling of the battery presence signal.

The patent implements preliminary action by keeping the voltage divider circuit continuously powered and ready, while only activating the comparator and control logic temporarily when detection is needed. The voltage divider continuously establishes the reference voltage, so when a detection event is triggered, the system can immediately compare and respond without waiting for power-up sequences, achieving both low power consumption and fast reaction time.

The patent extracts the digital communication function from the battery presence detection line by providing a separate dedicated communication line between the battery and device. This separation removes the harmful voltage divider signal from the communication path, eliminating interference while maintaining a simple overall interface structure through the use of additional dedicated pins rather than overloading the detection line.

The patent applies multi-functionality by designing the battery interface to support both battery presence detection and digital communication functions simultaneously through properly managed signal lines. The voltage divider circuit is designed to operate in conjunction with communication protocols, allowing the same physical interface to serve multiple purposes without requiring complete separation, thus avoiding unnecessary complexity while eliminating interference through proper circuit design.