Patent ID: 7426125

Claim:
An adjustable compact high-frequency-high-voltage power supply, comprising: a timing control circuit, including at least a first capacitor, a fourth variable resistor, a fourth transistor and a first diode; a voltage control circuit, including at least an inverter control chip, a first variable resistor, a second variable resistor, a first field-effect transistor, a second diode and a first inductor; a pulse-width modulation (PWM) circuit, including at least a PWM driver chip, a third variable resistor, a first resistor, a second resistor and a second capacitor; an inverter, including at least a coupling transformer and a second full-bridge field-effect transistor and a third full-bridge field-effect transistor; and a high-frequency-high-voltage transformer; wherein a setting resistance of the fourth variable resistor along with the first capacitor and the first diode of said timing control circuit control the first field-effect transistor to generate a timing control signal when said timing control circuit receives a DC voltage from a power supply unit; wherein the timing control signal varies according to a first setting resistance of the fourth variable resistor so as to control the inverter control chip of said voltage control circuit for activating the first field-effect transistor to generate a first voltage level and a second voltage level at an output terminal of the first inductor according to a second setting resistance of the first variable resistor or both setting resistances of the first variable resistor and the second variable resistor respectively, and output the first voltage level and the second voltage level to two source electrodes of the second full-bridge field-effect transistor and the third full-bridge field-effect transistor of said inverter, wherein the first voltage level and the second voltage level are adjustable by continuously adjusting the first variable resistor and the second variable resistor during operation; wherein said PWM circuit generates a frequency control signal that is output to the coupling transformer of said inverter according to a fifth setting resistance of the third variable resistor, wherein the frequency control signal is adjustable by continuously adjusting the third variable resistor during operation; wherein the coupling transformer of said inverter turns on the second full-bridge field-effect transistor and the third full-bridge field-effect transistor according to the frequency control signal so that the second full-bridge field-effect transistor and the third full-bridge field-effect transistor generate a first voltage pulse or a second voltage pulse according to the first voltage level or the second voltage level respectively, wherein the first voltage pulse or the second voltage pulse is output to said high-frequency-high-voltage transformer to generate corresponding high-frequency-high-voltage AC power.