Patent ID: 8861228

Claim:
A high voltage controller comprising: a voltage select input for setting a desired output voltage and a current select input for setting a desired load current, an actual voltage input for receiving a high voltage output feedback signal and an actual current input for receiving a load current feedback signal, first circuitry configured to generate an alternating current (AC) drive signal, second circuitry configured to generate a direct current (DC) drive signal, and closed loop control circuitry configured to adjust the DC drive signal; wherein the high voltage controller is configured to operate in: a current controlled mode wherein the closed loop control circuitry is configured to adjust the DC drive signal based on the desired output voltage set at the voltage select input and based on the feedback signals received by at least one of the actual voltage and actual current inputs, a voltage controlled mode wherein the closed loop control circuitry is configured to adjust the DC drive signal based on the desired load current set at the current select input and based on the feedback signals received by at least one of the actual voltage and actual current inputs, and, a combined voltage and current controlled mode wherein the closed loop control circuitry is configured to adjust the DC drive signal to achieve the desired output voltage and the desired load current set by at least one of the voltage select and current select inputs and based on the feedback signals received by at least one of the actual voltage and actual current inputs; wherein the DC drive signal is adjusted based on a predetermined linear relationship between at least one of the desired output voltage and the desired load current and a current value of at least one of the voltage select input and the current select input.