Fast DC discharge device

Details Fast DC discharge device Fast DC discharge device

2000-10-05

2001-12-04

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S364000

Reexamination Certificate

active

06326775

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a fast DC discharge device.
BACKGROUND OF THE INVENTION
In the prior art, when a high voltage transformer is used to perform fast discharge, though. in principle a high voltage transformer is an inductive load, because the following two reasons it does not present the inductive load effect which should be shown in the original fast discharge.
Referring to
FIG. 1
, a high voltage transformer increases a voltage of about low voltage (25V) to 200 times to achieve a high voltage output. Therefore the number of turns in its secondary coil is very high, which theoretically will result in an equivalent characteristic of a inductance to be an inductance connected in parallel with a capacitor. This is the first reason.
Referring to
FIG. 2
, though in principle a high voltage transformer has an inductive characteristic, when one side of the transformer is short-circuited, the inductive characteristic will become a quasi short circuit state. This is the second reason.
Referring to
FIG. 3
, conventional principle of fast DC discharge uses SW
1
to allow charge on C
1
to flow via SW
1
to T
1
to achieve the purpose of fast discharge. This is correct theoretically. However, in practical usage, failure of switch SW
1
occurs after continuous long-term operation due to the above two reasons, so that fast discharge theory is not suitable for continuous long-term on/off operation of fast DC discharge.
SUMMARY OF THE INVENTION
An object of the present invention is to overcome the above problem which arises in conventional fast DC discharge due to its practical inductive characteristic and to prevent failure of switch SW
1
used in the discharge thus increasing the life of said switch.


REFERENCES:
patent: 5548501 (1996-08-01), Chen

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