초록 ▼

A high voltage power supply (40) having a plurality of high voltage generators (50a, 50b, . . . 50j) that produce a controlled current in a load (24) having a capacitive component. Each high voltage generator consists of a pulsewidth-modulated (PWM) inverter, a high voltage transformer, and a high v

A high voltage power supply (40) having a plurality of high voltage generators (50a, 50b, . . . 50j) that produce a controlled current in a load (24) having a capacitive component. Each high voltage generator consists of a pulsewidth-modulated (PWM) inverter, a high voltage transformer, and a high voltage full bridge rectifier. The high voltage generators are divided into three groups: Group I, Group II, and Group III. During a driving mode of power supply operation, the Group I, Group II, and Group III high voltage generators produce an output voltage (Vgen) from the power supply which exceeds a voltage (Vc) across the capacitive component of the load, causing the current in the load to increase. When the current in the load reaches a desired value, the power supply enters a tracking mode of operation. During the tracking mode, the Group I and Group II high voltage generators produce an output voltage (Vgen) from the power supply which equals the voltage (Vc) across the capacitive component of the load. The current through the load remains constant while the power supply tracks the voltage across the capacitive component of the load. The driving mode and the tracking mode are repeatedly performed, as the high voltage generators are driven by a square wave voltage (Vsw) produced by a timing generator (66). A control circuit (56) is also provided in the power supply to enable or disable additional Group II high voltage generators in response to fluctuations in the voltage across the load.

대표청구항 ▼

A high voltage power supply for generating a controlled current in a load having component parts, comprising: (a) a timing generator producing a repetitive timing signal, wherein during each repetition of the timing signal the power supply cycles through a driving mode and a tracking mode: (b) a fir

A high voltage power supply for generating a controlled current in a load having component parts, comprising: (a) a timing generator producing a repetitive timing signal, wherein during each repetition of the timing signal the power supply cycles through a driving mode and a tracking mode: (b) a first voltage generator connected to the timing generator and producing a tracking voltage during the tracking mode; (c) a second voltage generator and the timing generator and coupled in cascode with the first voltage generator, the second voltage generator producing a base voltage during the driving mode and the tracking mode; and (d) a third voltage generator connected to the timing generator and coupled in cascode with the first and second voltage generators, the third voltage generator producing an accelerator voltage during the driving mode, wherein an output voltage produced by the power supply is equal to the sum of the tracking voltage, the base voltage, and the accelerator voltage produced by the first voltage generator, the second voltage generator, and the third voltage generator so that during the driving mode the output voltage from the power supply induces an increasing voltage in the lead to raise the current in the load to a desired level, and during the tracking mode the output voltage from the power supply maintains the current in the load at substantially the desired level.