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Instruction Manual V1.3
1.8
Built-in POWER SUPPLY
High voltage H.V switch HVC-XXXX/QCW-USB contains a high efficient and
powerful capacitor charging power supply. This type of power supply is
designed to charge a capacitor load efficiently. It works at full power condition
regardless the load is shorted (at the beginning of charging), heavy or light.
If a normal DC power supply is used for this purpose, it may create several
problems such as:
1). DC power supply may b e tripped b y an over current fault.
2). There mayb e no feedb ack loop formed b etween the charging power supply and the
capacitor b ank, so the accurate and real time setting/adjustment is difficult.
3). It takes a long time to charge up b ecause the charging process is very inefficient.
4). It may need an extra series resistor to avoid an over load condition and this causes
a fair amount of heating loss.
5). It may b e difficult to decrease the output voltage in short time since the capacitor
b ank is so huge.
In HVC-XXXX/QCW unit, there is a feedback loop formed between the huge
output capacitor bank and the capacitor charging power supply to regulate the
output current accurately.
HVC-XXXX/QCW uses the double switching technology that charging and
discharging the output voltage efficiently in short time. Combined with the
precise current tacking system, user can set the current (increasing and
decreasing) precisely regardless the output is in heavy or no load at all.
