Dual battery switch circuit.

摘要

A dual-battery switch circuit (10) associated with a load (34) is provided. The switch circuit (10) includes a primary battery (16), a secondary battery (17), a circuit (12) disposed to apply energy from the primary battery (16) to the load (34), and a controller (14) which disposed to sense attempts to apply energy to the load (34). The controller (14) is configured to couple the secondary battery (17) to the primary battery (16) with respect to the load (34) when a predetermined number of attempts to apply energy to the load (34) occur within a predetermined time period after a first attempt. Alternatively, a controller (14) is provided which couples the secondary battery (17) to the primary battery (16) with respect to the load (34) when an attempt is made to apply energy to the load (34) and the temperature is below a predetermined level.