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).
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 bB 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.
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.
Alignment and Adjustments
2-18
Samsung Electronics
Beam
(High voltage )
Factor of high
voltage change
Beam
(High voltage )
Width of FET
Gate Pulse
+ Ve (DC)
Vcp
High
Voltage
Parameters
Содержание HC-P4752W
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