Title:
【発明の名称】偏向回路
Document Type and Number:
Japanese Patent JP2872668
Kind Code:
B2
Abstract:
A vertical deflection amplifier (20) of a video display apparatus includes first (Q1) and second (Q2) transistor amplifier output stages arranged in a totem-pole, push-pull configuration. A vertical-deflection winding (LV) is coupled to the output stages at a deflection amplifier output terminal (22). An S-capacitor (C1) is coupled to the deflection winding (LV) at a second terminal (21) remote from the output terminal (22). A source (23) of deflection rate signals is coupled to the deflection amplifier (20) for generating a deflection current (iv) in the deflection winding (LV). A base current generating circuit (40) is coupled to one (Q1) of the transistor amplifier output stages for providing base current (i1) thereto. The S-capacitor voltage (V1) is applied to the base current generating circuit (40) for enabling conduction of base current (i1) in the one amplifier output stage (Q1). When the video display apparatus is first turned on, the initially discharged S-capacitor (C1) is slowly charged from a DC voltage supply (+30V) to delay generation of vertical def lection past completion of picture tube degaussing. A DC power supply (16) upon energization in response to a switch (15) produces a DC level (+DC2) sufficient for operating the deflection amplifier prior to the conclusion of degaussing.
Inventors:
HYUU FUERAA SAZARANDO ZA SEKANDO
Application Number:
JP9424387A
Publication Date:
March 17, 1999
Filing Date:
April 15, 1987
Export Citation:
Assignee:
AARU SHII EE TOMUSON RAISENSHINGU CORP
International Classes:
H03K4/69; H04N3/16; H04N3/233; H04N9/29; (IPC1-7): H04N3/16
Domestic Patent References:
| JP5038441A |
Other References:
【文献】米国特許4238713(US,A)
Attorney, Agent or Firm:
Tadahiko Ito