Power supply for use with electrodynamic screen

An AC power supply for connection to at least one electrode of an electrodynamic screen, the power supply comprising:

• a DC-to-DC converter electrically coupled to a source of DC voltage, the DC-to-DC converter further comprising an output of the DC-to-DC converter;
• a DC-to-AC converter electrically coupled to the output of the DC-to-DC converter, the DC-to-AC converter comprising a two-terminal passive element electrically coupled in series with a first transistor, the first transistor comprising a control terminal, wherein the control terminal of the first transistor is electrically coupled to a periodic voltage signal configured to switch the first transistor into an on state and an off state;
• an AC output, the AC output comprising an AC voltage configured to change periodically;
• a regulator circuit configured to sample the AC output voltage of the power supply, the regulator circuit further configured to detect when the AC output voltage reaches a predetermined voltage, and wherein;
• the regulator circuit is configured to electrically couple the power supply to the source of DC voltage when the output voltage is less than the predetermined voltage.