Dual Large Pulse Resistance™ (DLPR)
Battery Sensor Technology

The LPR method of measuring battery DC internal resistance is a highly effective breakthrough technique for battery monitoring.  A further refinement of the LPR technology is Dual Large Pulse Resistance (DLPR), which uses two stacked LPR pulses to further reduce the effects of system noise or connected inductive or capacitive loads.

The DLPR can be used to effectively test the present available capacity of the battery while it is in dynamic use in a noisy electronic environment.

The DLPR technique excels as a platform for monitoring batteries for a number of important reasons. 

• It provides highly accurate, real time, 'fuel gauge' (state of charge, SoC%)  information.
• It provides highly accurate, battery lifecycle (state of health, SoH%) information.
• It has very high tolerance for system noise and normal duty cycle dynamics.
• It does not require calibration and inherently measures and adjusts for the effects of temperature, age, sulfation, self discharge, and acid depletion.
• The hardware package is very small compared to other solutions.
• The hardware is relatively low cost compared to other solutions.
• It can seamlessly support a wide range of OE and aftermarket batteries without reprogramming or calibration.

A more detailed description of LPR, DLPR, and other battery monitoring methods is presented in 'Battery Monitoring Considerations for Hybrid Vehicles and Other Battery Systems with Dynamic Duty Loads', Battery Power Technology News, June 2006.