CN1913306A - Switch power circuit for vacuum fluorescence display of charger on vehicle - Google Patents
Switch power circuit for vacuum fluorescence display of charger on vehicle Download PDFInfo
- Publication number
- CN1913306A CN1913306A CN 200510028735 CN200510028735A CN1913306A CN 1913306 A CN1913306 A CN 1913306A CN 200510028735 CN200510028735 CN 200510028735 CN 200510028735 A CN200510028735 A CN 200510028735A CN 1913306 A CN1913306 A CN 1913306A
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- transformer
- pin
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Amplifiers (AREA)
Abstract
This invention discloses a switch circuit of a vacuum fluorescence display for a car-used charger including an input filter circuit, Darlington amplifying circuit, a transformer, a cut-off circuit, a high voltage output circuit and a feedback circuit , in which, +5V voltage is filtered by two capacitors then enters into the Darlington amplifying circuit composed of Q1 and Q2 triodes to generate square wave at pole C of Q2 via the primary side of the transformer to be inversed by it to generate a set of AC voltage at 6 and 8 pins of the transformer to supply filament, pin 7, R4, ZD2 and C7 make up of an anode or grid net light leakage cut-off voltage circuit, pin10 of the transformer outputs high AC voltage to be rectified by D4 and filtered by C5 and C6 to form high voltage DC voltage to supply the grid net and the anode, pin2 and 3, R3, C4, D3 and ZD1 form a feedback circuit to control the repeated switch to form a square wave to the forestage Darlington amplifying circuit.
Description
Technical field
The present invention relates to the switching power circuit that a kind of direct current power input is transformed to AC power output, relate to a kind of switching power circuit that is used for automobile meter vacuum fluorescent display in particular.
Background technology
The operation principle of vacuum fluorescent display (VFD) is the filament emitting electrons, and electronics quickens to get on the fluorescent material (anode) through aperture plate, makes light-emitting phosphor.Drive vacuum fluorescent display, Switching Power Supply must provide two groups of voltages, and one group is that alternating voltage is powered to filament, and another group is given grid and anode supply for high direct voltage.Be used for the vacuum fluorescent display of automobile meter because applied environment limits its switching power circuit can only insert one group of dc low-voltage usually, therefore need the redesign switching power circuit to make the dc low-voltage of input through circuit conversion, export two groups of voltages, one group is alternating voltage (Ef), and another group is high direct voltage (VH).
Summary of the invention
Technical problem to be solved by this invention provides a kind of switching power circuit of vacuum fluorescence display of charger on vehicle, and this circuit can be output into one group of alternating voltage and one group of high direct voltage with the dc low-voltage conversion of input.
The technical solution used in the present invention: a kind of switching power circuit of vacuum fluorescence display of charger on vehicle is characterized in that it comprises input filter circuit, darlington amplifying circuit, transformer, cut-ff voltage circuit, high-voltage output circuit and feedback circuit; Wherein said input filter circuit by and two capacitor C 1 and the C2 that connect form; Described darlington amplifying circuit is by triode Q1, Q2 and the R1 that is connected with triode Q1 base stage, with Q1 base stage, emitter and the diode D1 that connects, form with triode Q2 base stage, emitter and the diode D2 that connects; Described transformer T, its former limit winding 1,5 is connected with the collection utmost point of the triode Q2 of darlington amplifying circuit, and output square wave, its secondary 6,8 pin output AC voltages are given the power supply of vacuum fluorescent display filament; Described cut-ff voltage circuit is made up of 7 pin of transformer T and the resistance R 4, voltage stabilizing didoe ZD2 and the capacitor C 7 that are connected with it, is used to prevent anode or the grid light leak turned off; Described high-voltage output circuit be by secondary 10 pin of transformer T, with it diode in series D4 and and the capacitor C 5, the C6 that connect constituted, give the aperture plate and the anode supply of vacuum fluorescent display through rectifying and wave-filtering output high-voltage dc voltage by the High Level AC Voltage of 10 pin output; Described feedback circuit is made up of 2,3 pin and diode D3, voltage stabilizing didoe ZD1, resistance R 3, the capacitor C 4 of described transformer T, and its output feeds back to the darlington amplifying circuit of prime, to the control of the switch repeatedly formation square wave of darlington amplifying circuit.
Beneficial effect of the present invention: the switching voltage circuit that the invention provides a kind of vacuum fluorescence display of charger on vehicle, this circuit makes the one+5V direct voltage of input export two groups of voltages through circuit conversion, one group is that alternating voltage (Ef) is powered to filament, another group is that high direct voltage (VH) is given aperture plate and anode supply, thereby has satisfied the normal demonstration needs of vacuum fluorescent display under the specified conditions.
Description of drawings
Fig. 1 is the switching power circuit of vacuum fluorescence display of charger on vehicle.
Embodiment
Below in conjunction with Fig. 1 the present invention is described in further detail: a kind of switching power circuit of vacuum fluorescence display of charger on vehicle comprises input filter circuit 1, darlington amplifying circuit 2, transformer (TRANS) 3, cut-ff voltage circuit 4, high-voltage output circuit 5 and feedback circuit 6.Wherein said input filter circuit by and the electrochemical capacitor C1 and the ceramic condenser C2 that connect form; Described darlington amplifying circuit is by triode Q1, Q2 and the R1 that is connected with triode Q1 base stage, with Q1 base stage, emitter and the diode D1 that connects, form with triode Q2 base stage, emitter and the diode D2 that connects; Described transformer T, its former limit winding 1, the 5 output square wave that is connected with the collection utmost point of the triode Q2 of darlington amplifying circuit, its secondary 6,8 pin output AC voltages are given the power supply of vacuum fluorescent display filament; Described cut-ff voltage circuit is made up of 7 pin of transformer T and the resistance R 4, voltage stabilizing didoe ZD2 and the electrochemical capacitor C7 that are connected with it, is used to prevent anode or the grid light leak turned off; Described high-voltage output circuit be by secondary 10 pin of transformer T, with it diode in series D4 and and the electrochemical capacitor C5, the ceramic condenser C6 that connect constituted, give the aperture plate and the anode supply of vacuum fluorescent display through rectifying and wave-filtering output high-voltage dc voltage by the High Level AC Voltage of 10 pin output; Described feedback circuit by 2 pin of described transformer T, 3 pin respectively with by diode D3, voltage stabilizing didoe ZD1 series circuit, by resistance R 3, ceramic condenser C4 series circuit be connected the institute form, be connected the diode D1 negative pole of darlington amplifying circuit with ceramic condenser C4 contact by voltage stabilizing didoe ZD1 negative pole, the control of switch repeatedly of darlington amplifying circuit is formed square wave.Also be connected to the RC filter circuit of resistance R 2 and the parallel connection of electrochemical capacitor C3 picture at the diode D3 of described feedback circuit positive pole.
Operation principle of the present invention is: power unit circuit working principle: the voltage of+5V at first passes through C1, C2 filtering.Enter the darlington amplifying circuit of being made up of Q1 and Q2 then, the former limit (1,5 pin) by transformer produces square wave at the C of the Q2 utmost point.Through the inversion of transformer, just produced one group of alternating voltage at 6,8 pin of transformer and powered to filament.What 7 pin and R4, ZD2, C7 of transformer were constituted is the cut-ff voltage circuit, is anode or aperture plate light leak in order to prevent to turn off.What 10 pin of transformer came out is the alternating voltage process D4 rectification of high pressure, and the filtering of C5, C6 has formed high-voltage dc voltage and given aperture plate and anode supply.What formed by 2,3 pin of transformer and R3, C4, D3, ZD1 is feedback circuit, and the control of switch repeatedly of prime darlington amplifying circuit is formed square wave.
Above said content only is the basic explanation of the present invention under conceiving, and according to any equivalent transformation that technical scheme of the present invention is done, all should belong to protection scope of the present invention.
Claims (1)
1. the switching power circuit of a vacuum fluorescence display of charger on vehicle is characterized in that, it comprises input filter circuit, darlington amplifying circuit, transformer, cut-ff voltage circuit, high-voltage output circuit and feedback circuit; Wherein said input filter circuit by and two capacitor C 1 and the C2 that connect form; Described darlington amplifying circuit is by triode Q1, Q2 and the R1 that is connected with triode Q1 base stage, with Q1 base stage, emitter and the diode D1 that connects, form with triode Q2 base stage, emitter and the diode D2 that connects; Described transformer T, its former limit winding 1,5 is connected with the collection utmost point of the triode Q2 of darlington amplifying circuit, and output square wave, its secondary 6,8 pin output AC voltages are given the power supply of vacuum fluorescent display filament; Described cut-ff voltage circuit is made up of 7 pin of transformer T and the resistance R 4, voltage stabilizing didoe ZD2 and the capacitor C 7 that are connected with it, is used to prevent anode or the grid light leak turned off; Described high-voltage output circuit be by secondary 10 pin of transformer T, with it diode in series D4 and and the capacitor C 5, the C6 that connect constituted, give the aperture plate and the anode supply of vacuum fluorescent display through rectifying and wave-filtering output high-voltage dc voltage by the High Level AC Voltage of 10 pin output; Described feedback circuit is made up of 2,3 pin and diode D3, voltage stabilizing didoe ZD1, resistance R 3, the capacitor C 4 of described transformer T, and its output feeds back to the darlington amplifying circuit of prime, to the control of the switch repeatedly formation square wave of darlington amplifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510028735 CN1913306A (en) | 2005-08-12 | 2005-08-12 | Switch power circuit for vacuum fluorescence display of charger on vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510028735 CN1913306A (en) | 2005-08-12 | 2005-08-12 | Switch power circuit for vacuum fluorescence display of charger on vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1913306A true CN1913306A (en) | 2007-02-14 |
Family
ID=37722128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510028735 Pending CN1913306A (en) | 2005-08-12 | 2005-08-12 | Switch power circuit for vacuum fluorescence display of charger on vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1913306A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790541A (en) * | 2012-06-21 | 2012-11-21 | 杭州广安汽车电器有限公司 | Switching power supply for automobile air conditioner controller vacuum fluorescent display (VFD) |
-
2005
- 2005-08-12 CN CN 200510028735 patent/CN1913306A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790541A (en) * | 2012-06-21 | 2012-11-21 | 杭州广安汽车电器有限公司 | Switching power supply for automobile air conditioner controller vacuum fluorescent display (VFD) |
| CN102790541B (en) * | 2012-06-21 | 2015-10-28 | 杭州广安汽车电器有限公司 | A kind of Switching Power Supply for automotive air-conditioning controller VFD display screen |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102932997B (en) | LED (light-emitting diode) fluorescent lamp drive circuit and LED lamp tube | |
| CN103065589B (en) | A kind of backlight drive circuit and liquid crystal display | |
| CN103973084B (en) | A kind of for series resonance IGBT Driving Circuit | |
| CN103841694A (en) | Lamp | |
| CN106102290B (en) | A kind of device and illuminator based on electronic ballast control electronic control circuit | |
| CN1913306A (en) | Switch power circuit for vacuum fluorescence display of charger on vehicle | |
| CN202551459U (en) | LED (Light Emitting Diode) driving power supply module for silicon controlled regulating circuit | |
| CN102647838A (en) | Conversion module of electronic ballast-driven LED (light emitting diode) | |
| CN202551458U (en) | Conversion module for driving LED (Light-Emitting Diode) by using electronic ballast | |
| CN205408214U (en) | LED (light -emitting diode) drive system | |
| CN105636267B (en) | Sound and light controlled delay switch energy-saving LED corridor lamp | |
| CN202979375U (en) | LED fluorescent lamp drive circuit and LED tube | |
| CN101998715B (en) | Light-emitting diode (LED) power circuit | |
| CN106211474A (en) | The light adjusting circuit of the multiple dimming mode of a kind of compatibility and display device | |
| CN207589238U (en) | A kind of driving circuit with PFC for LED street lamp | |
| CN103066850A (en) | Isolating type boosted circuit, backlight module and liquid crystal display device | |
| CN202931602U (en) | Improved structure of LED fluorescent lamp driving circuit | |
| CN201774725U (en) | El cold light source driving circuit | |
| CN206851088U (en) | A kind of LED linear double voltage driving circuit and driving power | |
| CN202043331U (en) | LED (Light Emitting Diode) control device capable of automatically switching voltage | |
| CN210722266U (en) | Intelligent air purifier display | |
| CN108513409A (en) | A kind of T8 type LED light tube drive circuits of multiterminal driving | |
| CN201418196Y (en) | Big power electronic ballast | |
| CN202514149U (en) | Ballast of low-frequency electrodeless lamp | |
| CN202857048U (en) | LED fluorescent lamp drive circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |