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Drive circuit of fluorescent display

A technology for driving circuits and displays, applied to static indicators, light sources, instruments, etc., can solve the problem of not generating reactive power

Inactive Publication Date: 2009-11-25
FUTABA CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, no reactive power is generated

Method used

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  • Drive circuit of fluorescent display
  • Drive circuit of fluorescent display
  • Drive circuit of fluorescent display

Examples

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Embodiment Construction

[0023] By referring to Figure 1 to image 3 Embodiments of the present invention will be explained. Similarly, in Figure 1 to image 3 In , common parts use the same reference numerals.

[0024] First, explain Figure 1. Figure 1(a) shows a driving circuit for a fluorescent display. FIG. 1( b1 ) shows the potential at point A in the drive circuit of FIG. 1( a ). Fig. 1(b2) shows the potential at point B in the drive circuit of Fig. 1(a). FIG. 1( b3 ) shows currents of inductors L1 and L2 in the driving circuit of FIG. 1( a ). FIG. 1( b4 ) shows the on-off state of the switching element Q1 in the drive circuit of FIG. 1( a ).

[0025] As shown in FIG. 1( a ), reference numeral 21 is a control circuit. Reference numeral 22 is a fluorescent display. Reference numerals Vcc1 and Vcc2 are DC (direct current) input power. The fluorescent display 22 with Figure 4 The fluorescent displays shown are the same. The fluorescent display 22 has n anodes A1-An, m grids G1-Gm, and a ...

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PUM

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Abstract

A drive circuit for a fluorescent display that can prevent generation of reactive power in a Zener diode used to generate a cutoff bias voltage. In one embodiment, the drive circuit operates as a single ended primary inductor converter (SEPIC) circuit and includes an input side closed circuit, an output side closed circuit, and a coupling capacitor connecting the two closed circuits. The input side closed circuit includes an input power source, a first inductor and a switching element. The output side closed circuit includes a second inductor, a diode and a second capacitor. A filament of thefluorescent display is connected to the second capacitor. One end of a Zener diode is connected to a negative potential side of the filament and the other end of the Zener diode is connected to an input power source.

Description

technical field [0001] The invention relates to a driving circuit of a fluorescent display. Background technique [0002] by reference Figure 4 To explain the driving circuit of a conventional fluorescent display. The fluorescent display 12 has a filament F, a plurality of anodes A1-An, and a plurality of grids G1-Gm. Filament F emits thermionic electrons into the vacuum box. The plurality of anodes A1-An use fluorescent substances to cover the anode electrodes. The grid controls the emission of electrons from the filament F. An input voltage HV1 (direct current voltage) is selectively applied to the anodes A1-An from the control circuit 11 through the anode lines a1-an. Likewise, an input voltage HV2 (direct current voltage) is selectively applied to the gates G1-Gm from the control circuit 11 through the gate lines g1-gm. An input voltage HV3 (direct current voltage) is applied to the filament F through the switching element Tr1. The pulse control voltage Vc1 is app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/22
CPCH05B41/295Y02B20/183H05B41/282Y02B20/00G09G3/12G09G3/30G09G3/20
Inventor 奥英起
Owner FUTABA CORPORATION
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