GENERAL DESCRIPTION

The present disclose relates generally to the field of electric vehicles (EVs) systems. More specifically, this disclosure relates to an Auxiliary Power Module (APM) including a combined bi-directional converter for a low voltage battery, typically a 11V to 15V battery for automotive accessories.

Most current electric vehicles use 300V to 400V DC batteries as the primary power source. Batteries rated in this range are often referred to as high voltage (HV) batteries. Typically, a low voltage (LV) battery (e.g., a 12V battery) is used to provide power for the vehicle's accessories. In order to move power between the HV and LV batteries, for example, to charge the 12V battery from a high voltage DC bus, a HV to LV DC/DC converter is needed. This DC/DC converter is typically contained within or referred to as an Auxiliary Power Module (APM). In certain situations, the 12V battery can be used to charge the HV battery. Such a situation may arise if, for example, another power source (e.g., a solar panel) is provided power to the LV battery or LV DC bus.

For electric vehicles that require more power, it may be preferred to employ an 800V battery, which can introduce advantages such as reduced wire size, faster charging time, lower system loses, lower weight and lower volume due to the reduced wire size.

Accordingly, an object of the present disclosure is to provide a cost effective, space efficient, and low weight combined converter system for an 800V battery pack.

