Patent ID: 9673612
Date: 2017-06-06
CPC Classifications: G01N,H02H

Claim:
1. A battery-powered biosensor meter comprising: a microcontroller configured to determine a property of an analyte in a fluid; a memory coupled to the microcontroller to store measurement results; a battery holder configured to receive a plurality of batteries; a reverse battery protection circuit coupled to the battery holder, the microcontroller, and the memory; and a housing configured to house the microcontroller, the memory, the battery holder, and the reverse battery protection circuit, wherein the reverse battery protection circuit includes: a first P-channel MOSFET having a gate, a drain, and a source; a second P-channel MOSFET having a gate, a drain coupled to the gate of the first P-channel MOSFET, and a source coupled to the source of the first P-channel MOSFET; a first N-channel MOSFET having a gate coupled to the gate of the second P-channel MOSFET, a drain coupled to the drain of the second P-channel MOSFET and to the gate of the first P-channel MOSFET, and a source; a first load terminal coupled to the drain of the first P-channel MOSFET; a first positive battery terminal connector coupled to the source of the first P-channel MOSFET and to the source of the second P-channel MOSFET, the first positive battery terminal connector configured to electrically connect to a first battery terminal; a second positive battery terminal connector coupled to the gate of the first N-channel MOSFET and to the gate of the second P-channel MOSFET, the second positive battery terminal connector configured to electrically connect to a second battery terminal; a first negative battery terminal connector configured to electrically connect to a third battery terminal; a second negative battery terminal connector configured to electrically connect to a fourth battery terminal; and a second load terminal; wherein: the first negative battery terminal, the second negative battery terminal, the second load terminal, and the source of the first N-channel MOSFET are coupled to each other.