CN101627664A - Inverters - Google Patents

Abstract

Drive circuitry for a fluorescent lamp comprising inverter circuitry having outputs for connection to respective terminals of a fluorescent lamp and an extra low voltage transformer connected to the inputs of the inverter circuitry. The drive circuitry can be connected to one or more fluorescent lamps.

Description

Inverter

Technical field

The present invention relates to inverter.Be particularly related to a kind of gaseous discharge lamp that is used for, for example low (more preferably ultralow) of the drive circuit of fluorescent lamp presses the AC high-frequency inverter.

Background technology

Gaseous discharge lamp produces light by making electric spark through ionized gas.The operating principle of this lamp is known, does not need to lay down a definition herein again.Some gaseous discharge lamps produce ultra-violet radiation, and this ultra-violet radiation is converted into visible light by the fluorescence that applies on the glass shell inwall of lamp.This lamp is commonly called " fluorescent lamp ".

Gaseous discharge lamp, particularly fluorescent lamp are compared with incandescent lamp and to be shown significant advantage.Particularly, compare with incandescent lamp, efficient is higher under the equal brightness, and the duration is between 10 to 20 times.Particularly its long-life makes it attractive in commercial apparatus, and the expense (comprising labour cost) of replacing lamp in commercial apparatus may be huge especially.

Traditional, fluorescent lamp is by main power source (for example 240V AC) power supply, and the ballast that is used between power supply and the lamp is regulated the electric current that flows through this lamp.

Summary of the invention

Main purpose of the present invention is that enable can be by the fluorescent illuminating device of traditional ultralow pressure transformer (power supply just) power supply.For example, this light-emitting device can be advantageously used in commercial shelf device (luminous shelf), for example in supermarket or other shops.

" low pressure " expression upper voltage limit is 1000V AC in the application's the context, preferably is lower than 240V (just being lower than the principal voltage value)." ultralow pressure " expression voltage is lower than 50VRMS (AC) in the application's the context, 24V for example, and 18V, 12V, or still less.

In order to reach this purpose,, therefore need a kind of new low/ultralow pressure AC high-frequency inverter of exploitation because known ultralow pressure inverter is inappropriate.

The ultralow pressure inverter that following two kinds of main known type are arranged especially:

1.DC type is powered by the DC power supply.The problem of the inverter existence of the type is that its positive pole must strictly insulate with negative pole end, and does not contact with the utmost point maintenance of adjacent unit.

2.AC low frequency cell is powered by low frequency AC conventional heavy-duty wire wound transformer (non-electronics).The problem that the inverter of the type exists is, must be (the hard connection) of solid (solid) from the output of transformer to electrically contacting of equipment, otherwise can produce overheated, thereupon with electric arc (Arcs), electric spark (Sparks), and high noise level.In addition, consider that from security standpoint these transformers only have hot safety fuse.

On the contrary, embodiments of the invention can be the fluorescent lamp device power supply with the electronic transformer of standard.This is former never realized, because these electronic transformers are designed to be directly connected to Halogen lamp LED, rather than was connected to lamp (that is to say that fluorescent lamp needs inverter between himself and transformer) via inverter as required.The never manufactured mistake of such inverter.This needs just being used in combination of tuning capacitor, resistance and copper coil to realize, and this being used in combination in the standard inverter do not occur.

Therefore, the present invention is made up of low pressure AC high-frequency inverter.This inverter can be by the standard ultralow pressure AC high-frequency electronic transformer electronic transformer of the same type of low pressure halogen incandescent lamp power supply (for example be used for into) power supply.These transformers have also been introduced extra safe overload, short circuit and heat protection feature, and additional advantage is provided.

Being preferred for the high frequency transformer of the embodiment of the invention and a difference between the low-frequency transformer is, the output of tradition wire wound transformer and be input as the sinusoidal waveform of same frequency (50Hz just), and the output of (high frequency) electronic transformer is the sinusoidal envelope that doubles incoming frequency basically, for example with 35KHz (nominal) square-wave frequency modulation.

For the light-emitting device that uses this new invention preferred embodiment, be affected at the equipment Shi Buhui that contacts with the utmost point of nearby device.In addition, it only needs the touching contact to act on, and noise problem also can be eased.Cut off immediately when device breaks down, this also is an advantage.

In a preferred embodiment, light-emitting device is a feature with the side spring also, and this side spring contacts with the conductor on being installed in shelf brackets is instantaneous, and without input lead.This shelf contacts with two conductors, and this conductor is connected to the input of inverter two outputs of electronic transformer.

Description of drawings

Example of the present invention will be described with reference to the following drawings:

Fig. 1 illustrates the part of the inverter circuit of the embodiment of the invention;

Fig. 2 illustrates another part of inverter circuit among Fig. 1;

Fig. 3 illustrates the luminaire assembly that has inverter and side spring according to the embodiment of the invention;

Fig. 4 illustrates and is attached to the shelf bogie side frame, and can be used for the PCB of the embodiment of the invention;

Fig. 5 illustrates the side mounting spring (also can be other vibration-absorptive material) on the equipment side that is used in Fig. 3 assembly;

Fig. 6 illustrates the electronic transformer schematic diagram that combines with inverter (also can be an inverter);

Fig. 7 illustrates shelving system, utilizes the present invention of this system to can be used for for being installed in the fluorescent tube power supply on the shelving system; And

Fig. 8 illustrates the circuit diagram of the embodiment of the invention.

Embodiment

With reference to the exemplary inverter circuit of Fig. 1 and 2 description according to the embodiment of the invention.

At first see Fig. 1, from left to right, have from electronic transformer output that two low pressure AC electric currents (A1 and A2)-electronic transformer itself is not shown in the drawings.Electric current is following by this inverter circuit:

-A1 is through safety fuse.

-A1 and A2 are through choke (LO207).This choke as inhibitor with level and smooth AC power supplies.

-A1 and A2 are through the AC capacitor.This capacitor stores electric current.Choke and capacitor are all as the AC current filter.

The electric bridge that-A1 and A2 form through 4 diodes, electric bridge is converted into the DC electric current with the AC electric current, and this has also caused the increase of voltage.

-DC+ and DC-are through three capacitors.

In Fig. 2, continue current direction (Fig. 1 and Fig. 2 represent same circuit):

(R3 R4), passes through syntonizing coil to-DC+ then for R1, R2, to the input 1 of transformer through four resistance.

-DC-is through one in three terminals of two thermal switch (TIP1 and TIP2), and this thermal switch is as the fluorescent tube starter.

-R1, the 3rd terminal of R2 and TIP1 links to each other, and arrives the input 3 of transformer then.

-R3, the 3rd terminal of R4 and TIP2 links to each other, and arrives the input 2 of transformer then.

The middle terminal of-TIP1 arrives the input 5 of transformer then through capacitor C4.

The middle terminal of-TIP2 arrives the input 4 of transformer then through capacitor C4.

The output 1 (TO1) of-transformer is through three series capacitors (C5, C6, C7) end of arrival fluorescent tube.

-the second transformer output (TO2) directly arrives second end of fluorescent tube.

Example shown in Fig. 3 (exploded view), inverter circuit can be incorporated in the fluorescent lamp device easily.This inverter circuit can be installed in device body inside, and the output of circuit is connected to each terminal of fluorescent lamp (fluorescent tube in this example).

Equipment in the present embodiment also has spring connector at each end, so that it contacts with power rail (track) in the shelf brackets, this equipment will be installed on the described shelf brackets and (for example, describe in our early stage patent application GB2428141).Spring sectional fixture body as shown in Figure 5.

Simultaneously, as describing among the GB2428141, the power rail on the shelf brackets provides with the form of strip PCB, as shown in Figure 4.This strip PCB is attached on the shelf bogie side frame.

As schematically showing among Fig. 6, a plurality of inverter circuits can be connected to each fluorescent lamp in the shelf device, and they are all powered by single transformer (for example, ultralow pressure transformer).In the embodiment that substitutes, single inverter circuit can be used for driving a plurality of lamps.

Fig. 7 illustrates shelving system of the present invention, utilizes this shelving system, and the present invention can be used to the fluorescent tube power supply that is installed on this shelving system.

Fig. 8 illustrates the circuit diagram of the embodiment of the invention.

Can carry out various modifications to the embodiment of specific descriptions and example, and not deviate from spirit of the present invention and protection range.

Fig. 3 list of parts:

p1                 p8

D283-031           D283-056

Fluorescence RIVERTER Pop rivet

X1                 3.2 X 8MM

                   X2

p2

D283-033           p9

M3 X 8L counter-sunk screw D283-036

X4 rivet assembly

X2

p3

D283-016 p10

Luminaire end cap RH D283-032

X1 BJ8

26.642.8601.05

The p4 lamp holder

D283-025 X2

The luminaire spring

X2 p11

D283-032

p5 BJ828.242.106

The D283-035 clip

4MM crimp connector X2

X2

p12

p6 D283-030

D283-034 lamp 21W HE15-1

M3 tapping screw X1

X2

p13

p7 D283-020.

The D283-018 luminaire

Luminaire main diffusion body

X1 X1

p14

D283-017

Luminaire end cap LH

X1

Claims (18)

1. the drive circuit of a fluorescent lamp comprises inverter circuit, and inverter circuit has input and output, and described input is used for the ultralow pressure alternating current supply from the ultralow pressure transformer, and described output is used for the connection of each terminal of fluorescent lamp.

2. drive circuit according to claim 1 also comprises the ultralow pressure transformer of the input that is connected to described inverter circuit.

3. drive circuit according to claim 2, wherein said transformer is an electronic transformer.

4. according to the described drive circuit of above arbitrary claim, it combines with one or more fluorescent lamps of the output that is connected to described inverter circuit.

5. according to the described drive circuit of above arbitrary claim, wherein said inverter circuit comprises the filter that is used for the AC input current.

6. drive circuit according to claim 5, wherein said filter comprise choke and AC capacitor.

7. according to the described drive circuit of above arbitrary claim, wherein said inverter circuit comprises the AC-DC transducer.

8. drive circuit according to claim 7 wherein has voltage to raise through described AC-DC transducer.

9. according to claim 7 or 8 described drive circuits, wherein said AC-DC transducer comprises diode bridge.

10. according to the described drive circuit of above arbitrary claim, comprise the one or more thermal switch that act as glow starter.

11. according to the described drive circuit of above arbitrary claim, wherein said inverter circuit is included in the transformer of outlet side, and the output of the connection that is used for fluorescent lamp is provided from each output of this transformer.

12. a shelf device comprises one or more fluorescent lamps to light this shelf device, this fluorescent lamp is powered by the ultralow pressure power supply by the described drive circuit of above arbitrary claim.

13. shelf device according to claim 12, wherein said fluorescent lamp is installed in the fixture, and described fixture is equipped with the inverter circuit of described drive circuit at least.

14. shelf device according to claim 13, but wherein said fixture is mounted to the instrument of the supporting construction of shelf device with comprising removal.

15. shelf device according to claim 14, wherein said fixture comprises the external electric contact, and when described fixture was installed on the described supporting construction, described external electric contact contacted with conductor in the supporting construction.

16. shelf device according to claim 15, wherein said contact is an elastic spring element.

17. be used for fluorescent lamp fixture according to each described shelf device of claim 12 to 16.

18. a ultralow pressure exchanges high-frequency inverter.

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