An apparatus and method are disclosed to provide transformerless safety
isolation in a power supply. One example regulated power converter
includes input terminals included in a primary circuit of the power
converter. Output terminals are included in a secondary circuit of the
power converter. A plurality of safety capacitors including first and
second safety capacitors are also included. Each of the plurality of
safety capacitors includes a respective first terminal coupled to the
primary circuit and a respective second terminal coupled to the secondary
circuit. The plurality of safety capacitors galvanically isolates the
primary circuit from the secondary circuit. A power switch is included in
the primary circuit. The power switch is coupled such that switching of
the power switch causes energy to transfer between the primary and
secondary circuits through the plurality of safety capacitors.
Substantially all of the energy that is transferred between the primary
and secondary circuits is through the plurality of safety capacitors.