Piezoelectric inverter power supply for cold-cathod lamp as scanning head light source of scanning instrument

A technology of inverter power supply and cold cathode, which is applied in the direction of light source, electric light source, and irreversible DC power input is converted into AC power output, etc. Fewer components and less electromagnetic interference

Inactive Publication Date: 2003-08-20
西安康弘新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of existing scanners using traditional wire-wound transformers to increase the voltage to ignite cold-cathode lamps, and use chip piezoelectric ceramic transformers to form piezoelectric inverter power supplies for scanner cold-cathode lamps

Method used

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  • Piezoelectric inverter power supply for cold-cathod lamp as scanning head light source of scanning instrument
  • Piezoelectric inverter power supply for cold-cathod lamp as scanning head light source of scanning instrument
  • Piezoelectric inverter power supply for cold-cathod lamp as scanning head light source of scanning instrument

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Embodiment Construction

[0008] In order to understand the content of the present invention more clearly, the following is a further description in conjunction with the accompanying drawings:

[0009] When the external power supply 1 applies a certain DC voltage, the multi-resonant circuit 2 starts to work, and the generated frequency is f s The square wave voltage output, its frequency depends on R 1 , R 2 , C 1 And R 3 , R 4 , C 2 , The square wave voltage is generated by the transistor Q 1 (Or Q 2 ) Collector output, through R 5 , C 3 The output of the coupling circuit 3 composed of Q 3 With Q 4 Complementary tube driving circuit 4 is amplified and then passed through MOS-FET Q 5 And series inductance L 1 Composed of the output of the switching power amplifier, driving the chip piezoelectric ceramic transformer 6 boost output (the resonant frequency of the chip piezoelectric ceramic transformer is f t ), the cold cathode lamp 8 is ignited, and the protective circuit 7 plays a role in that when a certai...

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Abstract

The present invention relates to a DC / AC power supply, especially relates to an inverter in pizoelectric type used for cold cathode lamp tube of light source at scanning head of scanner, which is composed of multivibration circuit, RC coupling circuit, complementary tube driving circuit, MOS-FET tube amplifying circuit, chip type of piezoelectric ceramic transformer and protective circuit of damage for cold cathode lamp tube.

Description

Technical field [0001] The invention relates to a DC / AC power supply, in particular to a piezoelectric inverter power supply for a cold cathode lamp tube of a scanning head light source of a scanner. Background technique [0002] At present, there are two main types of scanner lighting sources on the market. One is to use light-emitting diodes as the light-emitting source, and the other is to use cold-cathode lamps as the light-emitting source. Due to the low luminous efficiency of light-emitting diodes, most of them use cold Cathode lamps are used as light sources. These two types of scanner lighting sources generally use traditional wire-wound transformers to achieve voltage conversion to achieve the voltage required by light-emitting diodes or cold cathode lamps, especially cold cathode lamps. The excitation voltage of more than one thousand volts can cause the gas in the cold cathode lamp tube to break down and ionize to produce glow discharge and emit light. The use of tradi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/42H05B41/288
Inventor 陈耀强侯志俊
Owner 西安康弘新材料科技有限公司
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