CN2284480Y - D. C inverter of integrated circuit fluorescent lamp - Google Patents
D. C inverter of integrated circuit fluorescent lamp Download PDFInfo
- Publication number
- CN2284480Y CN2284480Y CN 95217257 CN95217257U CN2284480Y CN 2284480 Y CN2284480 Y CN 2284480Y CN 95217257 CN95217257 CN 95217257 CN 95217257 U CN95217257 U CN 95217257U CN 2284480 Y CN2284480 Y CN 2284480Y
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- circuit
- fluorescent lamp
- control circuit
- inverter
- pulse
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Abstract
The utility model relates to a DC inverter for a fluorescent lamp. The utility model comprises an inversion control circuit which is formed by the connection of a pulse-width modulation control circuit, an auxiliary power supply circuit and an auxiliary turn-off circuit, a main inversion loop which is formed by that a push-pull typed working power electronic switch is connected to a main transformer, and a current ballasting circuit which is formed by that an LC resonance network is connected to a fluorescent lamp filament. The pulse-width modulation control circuit is made of integration sheets, and a double-channel and full symmetric fixing frequency drive signal is produced to cause two power electronic switches alternately on and off. A DC voltage can be inverted to a high frequency AC square-wave voltage. The LC resonance network produces high voltage to light up the fluorescent lamp to keep stable working. The frequency stability of the utility model is good.
Description
The utility model relates to a kind of electric lighting device, relates to a kind of circuit arrangement that is used for general electric light source or rather.
At present, in using galvanic rolling stock, communication apparatus, employed direct current supply fluorescent lamp inverter all adopts discrete component to make, its basic circuit structure is to connect coupling transformer by high-power electronic switch to realize self-oscillation, with dc inverter is to use for fluorescent lamp behind the high-frequency alternating current, its vibration step rate not only depends on the parameter of elements such as coupling transformer in the inverter, but also be subjected to the influence of factors such as supply voltage, so each inverter, or even same inverter is in different operational environments, and its operating frequency can exist than large deviation.This inconsistency will directly influence the operating state of fluorescent lamp, even fluorescent lamp is normally started, and when supply voltage has than great fluctuation process, influence more outstanding especially.In addition, the inverter of being realized by discrete component also is being very limited aspect perfect control and the defencive function.
The purpose of this utility model is a kind of integrated circuit fluorescent lamp direct-flow inverter of design; it is a kind of direct current supply fluorescent lamp inverter that adopts integrated circuit (IC) design; can effectively improve the stability of inverter operating frequency; improve its functional reliability, and be convenient to increase the control and the defencive function of inverter.
Integrated circuit fluorescent lamp direct-flow inverter of the present utility model, be linked in sequence and constitute by inverter control circuit, main inversion circuit, ballasting circuit, described main inversion circuit connects main transformer by the high-power electronic switch circuit and constitutes, described ballasting circuit is the LC network, connect and compose series resonant circuit with the fluorescent tube filament, it is characterized in that:
Described inverter control circuit comprises integrated control circuit for pulse-width modulation, exports the fixed drive signal frequently of two passages symmetry respectively; Described high-power electronic switch circuit is the push-pull circuit that is connected and composed by pair transistor; The fixed drive signal output frequently of the two passages symmetry of described integrated control circuit for pulse-width modulation connects the input of described push-pull circuit two transistor respectively.
Described inverter control circuit also includes the auxiliary breaking circuit that is made of transistor connection resistance, electric capacity, be connected between the fixed drive signal output frequently of two passages symmetry and ground end of described integrated control circuit for pulse-width modulation the oscillating impulse output OSC of the described integrated control circuit for pulse-width modulation of control termination of auxiliary breaking circuit.
Described inverter control circuit also includes the auxiliary power circuit that is connected and composed by resistance, electric capacity, voltage-stabiliser tube, is connected between the power end of 48V or 24V or 110V dc power output end and described integrated control circuit for pulse-width modulation.
Described series resonant circuit has two or more, inductance one end of each series resonant circuit and described main transformer secondary side coil one end also connect, the inductance other end of each series resonant circuit connects each corresponding fluorescent lamp one side lamp silk one end respectively, the described main depressor secondary side coil other end of handing over connects each fluorescent lamp opposite side filament one end, and the electric capacity two ends of described each series resonant circuit connect the other end of each corresponding fluorescent lamp both sides filament respectively.
Main inversion circuit is under the control of inverter control circuit, break-make in turn by two high-power electronic switchs, the limit of paying at main transformer induces the high-frequency ac square-wave voltage, and with this working power as fluorescent lamp, between fluorescent lamp two cathode terminals, produce the voltage of enough pick through the LC resonant network,, start fluorescent lamp low density gas disruptive discharge in the fluorescent lamp, the LC network promptly transfers fluorescent lamp ballasting is made the fluorescent lamp steady operation then.
Further specify technology of the present utility model below in conjunction with embodiment and accompanying drawing
Fig. 1 integrated circuit fluorescent lamp direct-flow inverter theory diagram;
Fig. 2 integrated circuit fluorescent lamp direct-flow inverter is implemented circuit diagram;
The fixed drive signal waveform schematic diagram frequently of Fig. 3 two passages symmetry;
Referring to Fig. 1, integrated circuit fluorescent lamp direct-flow inverter mainly comprises inverter control circuit 11, main inversion circuit 12 and ballasting circuit 13.Wherein inverter control circuit 11 is to be connected and composed by integrated control circuit for pulse-width modulation 111, auxiliary power circuit 112 and auxiliary breaking circuit 113.Main inversion circuit 12 is connected and composed by two high-power electronic switchs (representing with K1, K2) and the main transformer T that are in the symmetrical operation mode.13 series resonance LC networks 131 that are connected to form by the filament with fluorescent lamp M of ballasting circuit are realized.DC power supply DC powers to integrated control circuit for pulse-width modulation 111 to inverter power supply and by auxiliary power circuit 112.
Integrated control circuit for pulse-width modulation 111 to two power electronic switching K1, K2 of main inversion circuit provide two highly symmetry, duty ratio less than 50% decide frequency drive signal (voltage or power supply, shown in C1, C2 among Fig. 3), control two high-power electronic switch K1, K2 and take turns break-make, and induce the high-frequency ac square-wave voltage on the limit of paying of main transformer T, the LC resonant network 131 in ballasting circuit 13 and between fluorescent lamp M two ends, produce high pressure and realize that the gas breakdown discharge starts fluorescent lamp M.The LC network is used for fluorescent lamp ballasting then, keeps it and stably works.Because the oneself power consumption of power electronic switching mainly results from the electronic switch turn off process, for shortening the turn-off time of power electronic switching, this inverter control circuit 11 is provided with auxiliary breaking circuit 113, to quicken to turn-off electronic switch, reduces the oneself power consumption of electronic switch.
Referring to Fig. 2, resistance R 1, capacitor C 10 and voltage stabilizing didoe ZD connect and compose auxiliary power circuit, provide required low-tension supply to control circuit for pulse-width modulation U1, direct current supply DC48V (storage battery), also 24V or 110V or intervenient DC power supply.
Control circuit for pulse-width modulation in the inverter control circuit is connected and composed by integrated U1 (SG3524 or TL494 etc.) and resistance R 2, R5, R6, capacitor C 20, C5, C6, its output C1, C2 end output both heights symmetry, duty ratio are less than 50% frequency-fixed signal, as shown in Figure 3, provide the square wave drive electric current of deciding frequency, two passage symmetries to pliotron Q1, Q2 respectively, the frequency of this driving power then depends on timing resistor R2 and capacitor C 20 fully.
Pliotron Q1, Q2 (MJE13005), diode D1, D2 and main transformer T connect and compose main inversion circuit, and by the alternate conduction of Q1, Q2, by realizing inversion, wherein the effect of D1, D2 is respectively Q1, Q2 to be carried out reverse protection.Power electronic switching can be pliotron, power MOS pipe or IGBT pipe (a kind of high-power switch device).
Transistor Q3 (9014), resistance R 3, capacitor C 3 and transistor Q4 (9014), resistance R 4, capacitor C 4 connect and compose the auxiliary breaking circuit of pliotron Q1, Q2 respectively, by the oscillating impulse output OSC driving of integrated control circuit for pulse-width modulation U1.
Ballasting circuit is connected and composed by inductance L and capacitor C T, and the high-frequency ac voltage that obtains from main transformer T secondary side coil is through the filament series resonance of L, CT and fluorescent tube M, can start fluorescent lamp M and guarantee the operate as normal of fluorescent lamp M.
This inverter can drive single fluorescent tube by a LC series resonance networking is set, also can be by the fluorescent tube of two or more LC series resonance network-driven more than two or two is set, drive LC (L, CT, L ', CT ') the series resonance network of two fluorescent tube M, M ' and being connected of main transformer T secondary side coil shown in Fig. 2, the rest may be inferred by analogy for it.
The utility model is the fluorescent lamp direct-flow inverter by integrated control circuit for pulse-width modulation control, make inverter under the effect of inverter control circuit, alternately break-make by high-power electronic switch realizes high-frequency inversion, with the DC power supply inversion is that high-frequency alternating current uses for fluorescent tube, and in control circuit, introduce the turn off process of auxiliary breaking circuit with the accelerated electron switch, reduce the oneself power consumption of electronic switch, whole inverter circuit is simple, operating frequency stable, efficient and reliable.
Claims (4)
1, a kind of integrated circuit fluorescent lamp direct-flow inverter, be linked in sequence and constitute by inverter control circuit, main inversion circuit, ballasting circuit, described main inversion circuit connects main transformer by the high-power electronic switch circuit and constitutes, described ballasting circuit is the LC network, connect and compose series resonant circuit with the fluorescent tube filament, it is characterized in that:
Described inverter control circuit comprises integrated control circuit for pulse-width modulation, exports the fixed drive signal frequently of two passages symmetry respectively; Described high-power electronic switch circuit is the push-pull circuit that is connected and composed by pair transistor; The fixed drive signal output frequently of the two passages symmetry of described integrated control circuit for pulse-width modulation connects the input of described push-pull circuit two transistor respectively.
2, integrated circuit fluorescent lamp direct-flow inverter according to claim 1, it is characterized in that: described inverter control circuit also includes the auxiliary breaking circuit that is made of transistor connection resistance, electric capacity, be connected between the fixed drive signal output frequently of two passages symmetry and ground end of described integrated control circuit for pulse-width modulation the oscillating impulse output OSC of the described integrated control circuit for pulse-width modulation of control termination of auxiliary breaking circuit.
3, integrated circuit fluorescent lamp direct-flow inverter according to claim 1, it is characterized in that: described inverter control circuit also includes the auxiliary power circuit that is connected and composed by resistance, electric capacity, voltage-stabiliser tube, is connected between the power end of 48V or 24V or 110V dc power output end and described integrated control circuit for pulse-width modulation.
4, integrated circuit fluorescent lamp direct-flow inverter according to claim 1, it is characterized in that: described series resonant circuit has two or more, inductance one end of each series resonant circuit and described main transformer secondary side coil one end also connect, the inductance other end of each series resonant circuit connects each corresponding fluorescent lamp one side lamp silk one end respectively, the described main depressor secondary side coil other end of handing over connects each fluorescent lamp opposite side filament one end, and the electric capacity two ends of described each series resonant circuit connect the other end of each corresponding fluorescent lamp both sides filament respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95217257 CN2284480Y (en) | 1995-07-18 | 1995-07-18 | D. C inverter of integrated circuit fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95217257 CN2284480Y (en) | 1995-07-18 | 1995-07-18 | D. C inverter of integrated circuit fluorescent lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2284480Y true CN2284480Y (en) | 1998-06-17 |
Family
ID=33866095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95217257 Expired - Fee Related CN2284480Y (en) | 1995-07-18 | 1995-07-18 | D. C inverter of integrated circuit fluorescent lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2284480Y (en) |
-
1995
- 1995-07-18 CN CN 95217257 patent/CN2284480Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |