| 摘要 |
A modulator system 100 which generates high voltage pulses suitable for supply across a high voltage load 102 having a thermionic cathode; the modulator system comprises a switching mechanism 112 which generates high voltage pulses from a high voltage DC power supply unit (PSU) for application to a thermionic cathode; the modulator system further comprises an isolation transformer 128; a heater PSU 106 connected to a cathode heater through the isolation transformer which provides an AC current thereto; the modulator system further comprises a controller 104 to receive pulse instruction signals and trigger generation of corresponding high voltage pulses by the switching mechanism, to calculate the estimated arrival time of a next pulse instruction signal, and disable the heater PSU for a preset time, commencing before the estimated arrival time of the next pulse instruction signal, such that no current is supplied from the heater PSU while current is supplied from the high voltage PSU. The pulse instruction signals may have an irregular frequency. The high voltage load may be a magnetron. |
