A switching circuit includes a microchip which, in response to a signal from a signal switch, controls the operation of a power switch which, when closed, connects a load to a battery. The microchip can monitor the status of the battery and control the power switch to ensure optimum operation of the...http://www.google.ca/patents/US7119459?utm_source=gb-gplus-sharePatent US7119459 - Intelligent switch for connecting power to a load
