Integrated High-Voltage-Low-Voltage DC-DC Converter and Charger with Active Filter

A high voltage battery system comprising:

• a charger circuit comprising:
• an input switching bridge having an input and an output, the input configured to be coupled to an AC input source, the first switching bridge being further configured to convert an AC input voltage to an AC voltage having a selected voltage and frequency;
• a first transformer having a primary winding coupled to the output of the input switching bridge and a secondary winding;
• and
• a first rectifier charger circuit having an input coupled to the secondary winding of the first transformer and an output coupled to the high voltage DC bus;
• an active filter circuit comprising a filter switching bridge and a filter circuit, the active filter circuit having an input coupled to the output of the charger circuit and an output coupled to a high voltage DC bus, wherein the active filter circuit is operable to reduce harmonics associated with operation of the charger circuit and to provide a filtered DC voltage output;
• a high voltage battery coupled to the high voltage DC bus;
• and
• a high voltage to low voltage DC-DC converter circuit comprising:
• an inverter coupled to the active filter circuit and an output, the inverter being further configured to convert a high DC voltage to an AC voltage having a selected voltage and frequency;
• a second transformer having a primary winding coupled to the output of the inverter and a secondary winding;
• and
• a second rectifier charger circuit having an input coupled to the secondary winding of the second transformer and an output coupled to the low voltage DC bus and being configured to produce a low DC voltage for a low DC voltage bus of the high voltage battery system.

A high voltage battery system comprising:

• a charger circuit having an input configured to receive power from an AC input source and an output coupled to a high voltage DC bus configured to provide output DC power to a high voltage battery, wherein one or more switching converters of the charger circuit are operable to convert the received power into the output DC power;
• an active filter circuit having an input coupled to the output of the charger circuit and an output, wherein the active filter circuit is operable to reduce harmonics associated with operation of the charger circuit and to provide a filtered DC voltage output;
• and
• a high voltage to low voltage DC-DC converter circuit having an input coupled to the output of the active filter circuit and an output configured to be coupled to one or more low voltage loads, wherein the high voltage to low voltage DC-DC converter is operable to convert a filtered DC voltage received from the active filter to a lower DC voltage provided to a low DC voltage bus.

A high voltage battery system comprising:

• a charger circuit having an input configured to receive power from an AC input source and an output, wherein one or more switching converters of the charger circuit are operable to convert the received power into the output DC power;
• an active filter circuit having an input coupled to the output of the charger circuit and an output, wherein the active filter circuit is operable to reduce harmonics associated with operation of the charger circuit and to provide a filtered DC voltage output and wherein an output of the active filter circuit is coupled to a high voltage DC bus configured to provide output DC power to a high voltage battery;
• and
• a high voltage to low voltage DC-DC converter circuit having an input coupled to the active filter circuit and an output configured to be coupled to one or more low voltage loads, wherein the high voltage to low voltage DC-DC converter is operable to convert a DC voltage to a lower DC voltage provided to a low DC voltage bus.