the disclosed embodiments relate to a power - supply circuit , an electronic device that includes the power - supply circuit , and a method for generating high - voltage dc power from ac line power using the power - supply circuit . this power - supply circuit includes a voltage multiplier and a low dropout regulator , and does not include a step - up transformer . conventional power supplies often use a custom step - up transformer , which is expensive unless the power supplies are manufactured in high quantities . in contrast , one embodiment of the present disclosure provides a solid - state implementation of a 700 v regulated power supply that can take up to a 1020 v input from an 6 × voltage multiplier powered from the ac mains . hence , the disclosed power - supply circuit eliminates the need for large , heavy and expensive step - up transformers and chokes that are used in conventional high - voltage dc power supplies .