Dc to dc converter sourcing variable dc link voltage

An inverter-converter system for a climate system, comprising

• a DC to DC boost converter, the DC to DC boost converter includes:
• a first boost circuit having a first electromagnetic coil,
• a second boost circuit having a second electromagnetic coil, and
• a switch set, the switch set operable in a first voltage state and a second voltage state,
• wherein the first electromagnetic coil is connected to the second electromagnetic coil in series When the switch set operates in the second voltage state,
• wherein when the switch set operates in the first voltage state, the first boost circuit is configured to boost an input DC voltage to a first boosted voltage,
• wherein when the switch set operates in the second voltage state, the first boost circuit and the second boost circuit are configured to boost the input DC voltage to a second boosted voltage, and
• wherein the first boosted voltage is different from the second boosted voltage;
• a DC source providing the input. DC voltage to the DC to DC boost converter;
• a variable speed electric machine;
• and
• a controller that determines a load of the variable speed electric machine and controls the switch set based on the sensed load of the variable speed electric machine,
• wherein the DC to DC boost converter is configured to source one of the first boosted voltage and the second boosted voltage to the variable speed electric machine based on the sensed load of the variable speed electric machine.

A method for operating a DC to DC boost converter, the DC to DC boost converter including a first boost circuit having a first electromagnetic coil;

• a second boost circuit having a second electromagnetic coil;
• and a switch set, the switch set operable in a first voltage state and a second voltage state, wherein the first electromagnetic coil is connected to the second electromagnetic coil in series when the switch set operates in the second voltage state, the method comprising:
• receiving an input DC voltage from a DC source;
• sensing a load of a variable speed electric machine;
• when the load of the variable speed electric machine is sensed to require a first boosted voltage, operating the switch set in the first voltage state and the first boost circuit boosting the input DC voltage to the first boosted voltage;
• and
• when the load of the variable speed electric machine is sensed to require a second boosted voltage, operating the switch set in the second voltage state and the first boost circuit combined with the second boost circuit boosting the input DC voltage to the second boosted voltage,
• wherein the first boosted voltage is different from the second boosted voltage.