Invention Grant
- Patent Title: Charge measurement in a system using a pulse frequency modulated DC-DC converter
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Application No.: US15392487Application Date: 2016-12-28
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Publication No.: US10270272B2Publication Date: 2019-04-23
- Inventor: Jeffrey L. Sonntag , Timothy J. Dupuis , Jinwen Xiao
- Applicant: Silicon Laboratories Inc.
- Applicant Address: US TX Austin
- Assignee: Silicon Laboratories Inc.
- Current Assignee: Silicon Laboratories Inc.
- Current Assignee Address: US TX Austin
- Agency: Zagorin Cave LLP
- Main IPC: H02J7/00
- IPC: H02J7/00 ; G01R31/3832 ; G01R31/374

Abstract:
The charge drawn from a battery during each switching event (pulse) of a pulse frequency modulated DC-DC converter is determined during a calibration period. based on differences in pulse rate with different current loading. Another approach calibration approach determines charge drawn from the battery by measuring voltage across a sense resistor while measuring the total pulse rate and while adding sufficient load current to ensure that the voltage is much larger than the residual offset of the measurement system. During operation, the system counts number of pulses are counted and the total charge drawn from the battery is determined based, at least in part, on the charge transferred per pulse during calibration, the operational mode, the battery voltage during calibration and operationally and the output voltage. Based on the total charge drawn and temperature (for temperature dependent battery types), the battery state of charge is estimated.
Public/Granted literature
- US20180180699A1 CHARGE MEASUREMENT IN A SYSTEM USING A PULSE FREQUENCY MODULATED DC-DC CONVERTER Public/Granted day:2018-06-28
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