CN1310575C

CN1310575C - Non-stroboscopic energy-saving direct-current fluorescent lamp

Info

Publication number: CN1310575C
Application number: CNB031288200A
Authority: CN
Inventors: 陆镇平
Original assignee: Individual
Current assignee: Sun Lizhong
Priority date: 2003-05-23
Filing date: 2003-05-23
Publication date: 2007-04-11
Anticipated expiration: 2023-05-23
Also published as: CN1455633A

Abstract

The present invention relates to a non-stroboscopic energy-saving DC fluorescent lamp which comprises a DC fluorescent tube, a DC electronic ballast and a light fitting, wherein electron powder is only coated on a cathode filament of the DC fluorescent tube, no electronic powder is coated on an anode filament which is slightly thicker than the cathode filament, and a filament preheating and glowing circuit in the DC electronic ballast is a transistor filament preheating and high-pressure glowing circuit. The present invention mainly has the advantages that the problems of anode dark regions and anode blackening of the fluorescent tube are solved, and the DC fluorescent tube can once glow successfully without contact, which can improve the service life of both the lamp tube and the ballast and is favorable for protecting eyesight simultaneously.

Description

The energy-conservation DC fluorescent lamp of no stroboscopic

Technical field

The present invention relates to electric lighting, is the energy-conservation DC fluorescent lamp of a kind of no stroboscopic.

Background technology

The conventional fluorescent lamps of using has two kinds of Inductive ballast fluorescent lamp and electric ballast fluorescent lamps at present.The Inductive ballast fluorescent lamp is because of the alternating current of use 50HZ (or 60HZ), so stroboscopic phenomenon is serious, and is very big to people's eyesight influence, and eyes are tired easily, read a book very easy injury eyes under this light.Holland PHILIPS Co. is in early eighties, at first develop a kind of at the high frequency state (electric ballast of 30～60KHZ) times work, can be at starter under the low-voltage, so it is subject to people's attention immediately once occurring, and wishes to replace original Inductive ballast with it.But in fact its does not thoroughly eliminate stroboscopic, and is just smaller to visual acuity affected, because it only makes high frequency in the mains frequencies downward modulation, so the still low frequency stroboscopic of existing 50HZ has the high frequency stroboscopic of 30～60KHZ again.

Many electronic ballast for fluoresent lamp patents have been reported on the Chinese patent communique, wherein, the patent No. is that the Chinese patent of ZL93112478.6 discloses a kind of " no stroboscopic power saving fluorescent lamp device ", and this no stroboscopic power saving fluorescent lamp device comprises fluorescent tube, dc electronic ballast and light fixture three parts; Wherein, the dc electronic ballast consists predominantly of high pressure starting circuit, reduction voltage circuit, bridge rectifier filter circuit, transistor current stabilization circuit and filament preheating circuit; Be connected to isolating diode between high pressure starting circuit and the bridge rectifier filter circuit, reduction voltage circuit and bridge rectifier filter circuit series connection, again with the two ends that connect AC power after the high pressure starting circuit is in parallel, the transistor current stabilization circuit by isolating diode with connect the fluorescent tube positive pole after bridge rectifier filter circuit is connected, the negative pole of one termination bridge rectifier filter circuit of fluorescent tube negative pole, the filament preheating circuit that another termination of fluorescent tube negative pole is composed in series by filament pre-heating bubble and resistance, the positive pole of another termination bridge rectifier filter circuit electric capacity of filament preheating circuit.Though it has solved the stroboscopic problem preferably, power savings is also more obvious, because the filament preheating circuit that adopts filament pre-heating bubble and resistance to form, so fluorescent lamp needs the success of repeatedly flicker ability starter, therefore, fluorescent lamp can be subjected to the repeatedly impact of starter electric current, thereby influences lamp tube service life.

In addition, application number is that the PCT application and the patent No. of PCT/CN99/00159 is the Chinese patent " DC fluorescent lamp without stroboflash " of ZL99808297.X, a kind of fluorescent tube is disclosed, this fluorescent tube is a kind of DC fluorescent lamp pipe, scribble the electronics powder on the negative pole filament of fluorescent tube, applying electronic powder and slightly be coarser than negative pole not on the anodal filament, can solve the anodal early stage blackout phenomenon of fluorescent tube because of occurred by electron bombard, thereby can improve lamp luminescence efficient, prolonging lamp tube service life, but, the filament preheating circuit that its adopts is a kind of relay filament preheating circuit, though and the relay filament preheating circuit can a starter success,, relay has the contact, can influence ballast life (above-mentioned filament pre-heating bubble also has the contact).

Summary of the invention

The purpose of this invention is to provide the energy-conservation DC fluorescent lamp of a kind of no stroboscopic, wherein fluorescent tube can obtain stable direct current supply, solve the stroboscopic problem of fluorescent lamp, and can avoid the anodal early stage blackout phenomenon of fluorescent tube again because of occurred by electron bombard, improve lamp luminescence efficient, prolonging lamp tube useful life, also can avoid simultaneously using and jump the defective that bubble (filament pre-heating bubble) and relay etc. have the contact starter, realize contactless low-voltage starter, prolong the useful life of ballast.

For achieving the above object, the invention provides the energy-conservation DC fluorescent lamp of a kind of no stroboscopic, comprise fluorescent tube, dc electronic ballast and light fixture, wherein, this fluorescent tube is the DC fluorescent lamp pipe, this DC fluorescent lamp pipe only scribbles the electronics powder on the negative pole filament, and anodal filament slightly is coarser than the negative pole filament; The dc electronic ballast includes reduction voltage circuit, bridge rectifier filter circuit and the transistor current stabilization circuit that is connected in series, be characterized in, this dc electronic ballast also comprises the transistor filament pre-heating high pressure starting circuit that is connected between fluorescent tube and the current stabilization circuit, fluorescent tube is provided filament pre-heating and high pressure starter.

According to embodiments of the invention, this transistor filament pre-heating high pressure starting circuit comprises transistor LC oscillating circuit, and, provide the oscillator coil of this oscillating circuit and the preheat curent and the starting voltage of fluorescent tube by a transformer.Specifically, transistor filament pre-heating high pressure starting circuit is by transistor, transformer, voltage-stabiliser tube, some electric capacity are formed with the resistance that comprises a PTC thermistor, wherein, voltage-stabiliser tube and resistance series connection, the positive pole of a termination voltage-stabiliser tube and the output of transistor current stabilization circuit after transformer one coil and the electric capacity parallel connection, the collector electrode of another coil one end of another termination transformer and transistor, the positive pole of another termination DC fluorescent lamp pipe of this coil, the emitter of a termination transistor after another electric capacity and the parallel connection of PTC thermistor, one end of one end of another termination transformer secondary output coil and DC fluorescent lamp pipe negative pole and the negative pole of bridge rectifier filter circuit, and the other end of another termination DC fluorescent lamp pipe negative pole of this coil and an end of another electric capacity, the base stage of another termination transistor of this electric capacity and a resistance.

Therefore, because the fluorescent tube among the present invention is a kind of DC fluorescent lamp pipe of special construction, applying electronic powder not on the anodal filament, and also anodal filament is done slightlyer than negative pole filament, like this, when the bombardment of filament negative pole emitting electrons was anodal, anodal filament can not sputter the electronics powder, has just avoided the early stage blackout of fluorescent tube positive terminal yet, and, anodal filament is slightly thicker than negative pole filament, also just more anti-bombardment, the life-span of prolonging lamp tube.Particularly; the present invention has also adopted transistor filament pre-heating high pressure starting circuit; not only make this DC fluorescent lamp pipe can realize a starter success; reduce fluorescent tube and be subjected to the repeatedly impact of starter electric current; and energy low-voltage starter and contactless starter; prolonged the life-span of dc electronic ballast, also helped protection simultaneously eyes.

Description of drawings

Fig. 1 is a circuit diagram of the present invention.

Fig. 2 is the circuit diagram of another embodiment of the present invention.

Embodiment

At first see also Fig. 1.The present invention does not have the energy-conservation DC fluorescent lamp of stroboscopic, comprises DC fluorescent lamp pipe 2, dc electronic ballast 1 and light fixture (figure does not show).Wherein, scribble the electronics powder on the negative pole filament 22 of DC fluorescent lamp pipe 2, applying electronic powder not on the anodal filament 21, and anodal filament 21 slightly is coarser than negative pole filament 22; Dc electronic ballast 1 includes reduction voltage circuit 11, bridge rectifier filter circuit 12, transistor current stabilization circuit 13 and transistor filament pre-heating high pressure starting circuit 14.As seen from Figure 1, in the present embodiment, reduction voltage circuit 11 is to be formed in parallel by capacitor C 1 and resistance R 1; Bridge rectifier filter circuit 12 is formed by connecting by four diode D1, an electrochemical capacitor C2 and a resistance R 2, and the capacity of electrochemical capacitor C2 will be enough greatly to guarantee filtering performance; Transistor current stabilization circuit 13 is formed by connecting by transistor V1, resistance R 3, R4, R5 and electrochemical capacitor C3, the emitter of the termination transistor V1 of current-limiting resistance R5 wherein, the negative pole of another termination electrochemical capacitor C3; Be also shown in by Fig. 1, the transistor filament pre-heating high pressure starting circuit 14 that the present invention is configured in this dc electronic ballast is formed by connecting by transistor V2, transformer B, voltage-stabiliser tube D2, capacitor C 4, C5, C6, resistance R 6 and PTC thermistor R7, and wherein transformer B comprises coil L1, L2 and L3; Voltage-stabiliser tube D2 and resistance R 6 series connection, the positive pole of coil L2 and capacitor C 5 back one termination voltage-stabiliser tube D2 in parallel and the output of transistor current stabilization circuit, the end of other end wiring circle L1 and the collector electrode of transistor V2, the positive pole 21 of another termination DC fluorescent lamp pipe 2 of coil L1, capacitor C 4 and PTC thermistor R7 parallel connection, the emitter of one termination transistor V2, one end of the end of other end wiring circle L3 and the negative pole 22 of DC fluorescent lamp pipe 2, the negative pole of bridge rectifier filter circuit and C2 and R2, the other end of the negative pole 22 of another termination DC fluorescent lamp pipe 2 of coil L3 also links to each other base stage and the resistance R 6 of another termination transistor V2 of capacitor C 6 with an end of capacitor C 6.Annexation between above-mentioned each circuit is, after reduction voltage circuit 11, bridge rectifier filter circuit 12 and 13 series connection of transistor current stabilization circuit, connect transistor filament pre-heating high pressure starting circuit 14 again, the positive pole 21 that coil L2 and the L1 of transistor current stabilization circuit 13 by the transformer B in the transistor filament pre-heating high pressure starting circuit 14 connects DC fluorescent lamp pipe 2.

So the operation principle of the transistor filament pre-heating high pressure starting circuit of structure is, civil power is after reduction voltage circuit C1 and R1 step-down, through bridge rectifier filter circuit D1, R2, the C2 rectifying and wave-filtering becomes voltage direct current stably, through transistor current stabilization circuit V1, R3, R4, R5, behind the C3, form the LC oscillation circuit via capacitor C 5 and coil L2 again, this LC oscillation circuit is as the load of transistor V2, transistor V2 amplifier is supplied with LC oscillation circuit energy, make it to keep vibration, positive feedback is that the coupling coil L3 by tank coil L2 one side draws, send back to the base stage of amplifier in V2 through capacitor C 6, after amplifying, amplifier obtains output signal again from the LC oscillation circuit, circuit just produces self-oscillation, the filament that the electric current of coupling coil L3 flows through the DC fluorescent lamp tube cathode simultaneously carries out preheating, and coil L1 produces the positive pole that high pressure is added to the DC fluorescent lamp pipe, makes tube starting, behind the tube starting, oscillation circuit just quits work.In addition, the preheating that realize DC fluorescent lamp pipe 2 negative pole filaments 22 dc electronic ballast 1, and the generation high pressure makes DC fluorescent lamp pipe 2 starters and realizes alternating current to galvanic conversion stably.Obviously; transistor filament pre-heating high pressure starting circuit of the present invention; not only make the DC fluorescent lamp pipe can realize a starter success; reduce fluorescent tube and be subjected to the repeatedly impact of starter electric current; and energy low-voltage starter and contactless starter; prolonged the life-span of dc electronic ballast, also helped protection simultaneously eyes.

Figure 2 shows that an alternative embodiment of the invention, it mainly is on the basis of the foregoing description, also is provided with the controllable silicon delay turn-on circuit, as seen from Figure 2, and the current-limiting resistance R5 parallel connection of controllable silicon delay turn-on circuit and transistor current stabilization circuit; The controllable silicon delay turn-on circuit is formed by connecting by controllable silicon V3, resistance R 8, diode D3, voltage-stabiliser tube D4 and electrochemical capacitor C7, the positive pole of a termination controllable silicon V3 and an end of resistance R 5 after resistance R 8 and the diode D3 parallel connection, the negative pole of the positive pole of another termination voltage-stabiliser tube D4 and the positive pole of electrochemical capacitor C7, voltage-stabiliser tube D4 connects the control utmost point of controllable silicon V3, and the negative pole of electrochemical capacitor C7 connects the negative pole of controllable silicon V3 and the other end of resistance R 5.Controllable silicon delay turn-on circuit so; can reduce the energy consumption and the heat of resistance R 5; when energized fluorescent lamp starter; current-limiting resistance R5 can reduce the influence of impulse current; protective transistor V1 avoids burning out; controllable silicon V3 conducting behind the fluorescent lamp starter, electric current flows to fluorescent tube through controllable silicon, and flows to fluorescent tube without resistance R 5.This controllable silicon delay turn-on circuit generally can be used on (as more than 16 watts) on the bigger fluorescent lamp of power.

Claims

1, the energy-conservation DC fluorescent lamp of a kind of no stroboscopic, comprise fluorescent tube, dc electronic ballast and light fixture, wherein, this fluorescent tube is the DC fluorescent lamp pipe, this DC fluorescent lamp pipe only scribbles the electronics powder on the negative pole filament, and anodal filament slightly is coarser than the negative pole filament; The dc electronic ballast includes reduction voltage circuit, bridge rectifier filter circuit and the transistor current stabilization circuit that is connected in series, it is characterized in that: this dc electronic ballast also comprises the transistor filament pre-heating high pressure starting circuit that is connected between fluorescent tube and the current stabilization circuit, fluorescent tube is provided filament pre-heating and high pressure starter, this transistor filament pre-heating high pressure starting circuit comprises transistor LC oscillating circuit, and, provide the oscillator coil of this oscillating circuit and the preheat curent and the starting voltage of fluorescent tube by a transformer.

2, according to the energy-conservation DC fluorescent lamp of the described no stroboscopic of claim 1, it is characterized in that: transistor filament pre-heating high pressure starting circuit is by transistor V2, the coil L1 of transformer B, L2, L3, voltage-stabiliser tube D2, capacitor C 4, C5, C6, resistance R 6 and PTC thermistor R7 form, wherein, voltage-stabiliser tube D2 and resistance R 6 series connection, the positive pole of coil L2 and capacitor C 5 back one termination voltage-stabiliser tube D2 in parallel and the output of transistor current stabilization circuit, the end of other end wiring circle L1 and the collector electrode of transistor V2, the positive pole of another termination DC fluorescent lamp pipe of coil L1, the emitter of a termination transistor V2 after capacitor C 4 and the PTC thermistor R7 parallel connection, the end of other end wiring circle L3 and an end of DC fluorescent lamp pipe negative pole and the negative pole of bridge rectifier filter circuit, the other end of another termination DC fluorescent lamp pipe negative pole of coil L3 and an end of capacitor C 6, base stage and the resistance R 6 of another termination transistor V2 of capacitor C 6.

3, according to claim 1 or the energy-conservation DC fluorescent lamp of 2 described no stroboscopics, it is characterized in that: this transistor current stabilization circuit, also include a current-limiting resistance R5, the emitter of the termination transistor V1 of this current-limiting resistance R5, the negative pole of another termination electrochemical capacitor C3.

4, according to claim 1 or the energy-conservation DC fluorescent lamp of 2 described no stroboscopics, it is characterized in that: this dc electronic ballast circuit also includes a controllable silicon delay turn-on circuit in parallel with the current-limiting resistance of transistor current stabilization circuit.

5, according to the energy-conservation DC fluorescent lamp of the described no stroboscopic of claim 4, it is characterized in that: this controllable silicon delay turn-on circuit is formed by connecting by controllable silicon V3, resistance R 8, diode D3, voltage-stabiliser tube D4 and electrochemical capacitor C7, the positive pole of a termination controllable silicon V3 and an end of resistance R 5 after resistance R 8 and the diode D3 parallel connection, the positive pole of another termination voltage-stabiliser tube D4 and the positive pole of electrochemical capacitor C7, the negative pole of voltage-stabiliser tube D4 connects the control utmost point of controllable silicon V3, and the negative pole of electrochemical capacitor C7 connects the negative pole of controllable silicon V3 and the other end of resistance R 5.