kV Generation
Additional circuitry in the HV Tank allows the Filament Driver and Generator Driver to sense the flux in the HV Transformer and
confirm that the generator is on (HV_GEN_ON*.) Another circuit confirms that the flux is generating the right kV level
(FLUX_SEN) so that possible faults can be detected, including overvoltage (OVER_KVP_FAULT). The voltage across the lower
IGBTs is sensed to detect saturation faults (SAT_FAULT). Excessive current in the series tuning components will generate an
overload fault (OVERLD_FAULT). These fault signals are combined to drive a latch (FAULT, FAULT_LATCH) which can be
reset by software under some circumstances (FAULT_RST) or in others, software will positively shut down the kV generation
(SHUTDOWN).
An HF_SYNC signal from the X-Ray Controller accurately synchronizes the PWM kV generation to the correct operating
frequency. Two other signals control the pulse shape and rise time at different mA levels.
5
Service
Periodic Maintenance
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