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Multiple AC Input Degauss Circuit

IP.com Disclosure Number: IPCOM000101029D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Nakano, M: AUTHOR [+2]

Abstract

Disclosed is a circuit which can provide the same degaussing current to a degaussing coil automatically both 100V AC and 200V AC input. This circuit consists of a double voltage rectifier circuit portion with an input voltage detect circuit and a degaussing ON/OFF circuit portion.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 60% of the total text.

Multiple AC Input Degauss Circuit

       Disclosed is a circuit which can provide the same
degaussing current to a degaussing coil automatically both 100V AC
and 200V AC input.  This circuit consists of a double voltage
rectifier circuit portion with an input voltage detect circuit and a
degaussing ON/OFF circuit portion.

      A power supply for a color display monitor requires obtaining a
multiple AC input capability, such as rectifying and degaussing.  As
is well known, a double voltage rectifier circuit obtains multiple AC
input function for rectifying by switching the NEUTRAL terminal and
the center position of rectifying capacitors which depend on its
input voltage.  The disclosed circuit shown in the figure has the
multiple AC input function for degaussing by combining the double
voltage rectifier circuit and degaussing ON/OFF circuit to minimize
circuit components.

      The input voltage detect circuit detects the input voltage and
turns the switch S1 ON/OFF (ON/100V AC, OFF/200V AC).  As the result,
the rectifier circuit gets the same voltage (200X1.4) between + and -
while 100V AC or 200V AC is supplied.  In this circuit, the switching
of S1 occurs before the switching of S2.  The key item of this
circuit is the connection of the center position A of rectifying
capacitors and degaussing circuit end B.  The degaussing current of
each mode are described as follows.
      1)   100V AC input

      At first S1 is closed, and at the ti...