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Alignment and Adjustments
change keeps both dynamic and static changes
fixed. The output waveform of high valtage TR
emitter is as shown in the figure below.
6. Paraneters according to beam
To maintain the set high voltage value (31kV),
parmaters such as +Ve (DC), Vcp High Voltage
change (See the table below).
Factor of high
Width of FET
voltage change
Gate Pulse
Beam
(High voltage
)
Beam
(High voltage
)
7. Response Waveform
To reduce unstable high voltage fluctuation, the
existing high voltage type REG circuit controls
dynamic fluctuation by using C-block capacitor.
But, it can't detect actual dynamic fluctuation.
Also, its velocity of response to static fluctuation
is late because +B power supply changes per
about 1V. A PWM modulation type REG detects
static, dynamic high voltage fluctuation for only
Ton Time (when the current of the output TR
collector flows) each 1H, and modulates the
width of PWM pulse. So, this PWM type has
better improvement in the characteristic of high
voltage REG as compared to the existing type.
2-18
Parameters
High
+ Ve (DC)
Vcp
Voltage
8. Application Effects
1) Improvement of horizontal size fluctuation
2) Linearity improved
3) Embodiment of X-ray protection circuit
The figures below show characteristics when a
PWM high voltage REG circuit is applied.
Samsung Electronics
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