CN1110227C

CN1110227C - Lighting device for displaying case

Info

Publication number: CN1110227C
Application number: CN95105299A
Authority: CN
Inventors: 近藤达夫
Original assignee: Nakano Refrigerators Co Ltd
Current assignee: Nakano Refrigerators Co Ltd
Priority date: 1995-05-11
Filing date: 1995-05-11
Publication date: 2003-05-28
Anticipated expiration: 2015-05-11
Also published as: CN1135706A

Abstract

The present invention discloses an illuminating device for open display cabinets, which realizes cheap miniaturization preservation of commodities, such as chilled foods, fresh foods, etc., at low temperature by using stabilizers with a low power factor and trying to improve the power factor of starting circuits. A starting circuit of a fluorescent lamp (L) uses a stabilizer (ST) with a low power factor. For improving power factors, a capacitor C which is connected with a power supply of the stabilizer (ST) in parallel and is used for improving power factors is installed. Thereby, total currents are reduced, charges for inexpensive capacitors are expended, electric wires used by shops can be thin, the capacity of choppers can be reduced, and electric construction cost can be saved maximally.

Description

Display cabinet illumination device

Technical field

The invention relates to the invention of lighting device of the open-type show cabinet of commodity such as low-temp storage such as food shop, display chilled food, fresh food, in detail, be about using low power factor type stabilizer to seek to improve the open-type show cabinet lighting device of the power factor of starting circuit.

Background technology

Fig. 4 is expression one the most general in the fluorescent lamp circuit that is used for open-type show cabinet, the simple basic circuit, and choking-winding and fluorescent lamp L are connected in series, the filament of process fluorescent lamp L, and the switch S of employing has been arranged.And, be connected the capacitor C that prevents that noise from using with switch S parallel connection (also with fluorescent lamp L parallel connection) ₀(0.01～0.006 μ F) uses above-mentioned electric capacity and switch to constitute the glow starter of one usually.

Rise employ switch S one closure, filament and obtain preheating after, this switch disconnects, produce surge voltage on the two ends of switch S makes fluorescent lamp lighting.

The supply voltage of keeping fluorescent lamp L build-up of luminance necessity at that time is 2 times of light tube electric voltage normally.The fluorescent lamp of 20W, 15W for example, this voltage is about 55V, and the fluorescent lamp of 10W is 50V then, thereby is added with the supply voltage of 100V on it.

Here, but fluorescent lamp when build-up of luminance almost equivalent replacement become resistive component, thereby the input power factor in Fig. 4 circuit is roughly 0.5～0.55 as shown in the formula shown in (1), is 50～55% low power factor type.

Cos Φ=V1a/Vs=light tube electric voltage/supply voltage=0.5～0.55 ... (1)

Like this, in the general circuit of Fig. 4, the input power factor when making the fluorescent lamp starting is 0.5～0.55, efficient low (reactive current is big).In the retail shop of dozens of showcase was set, each showcase used many fluorescent lamps, and the fluorescent lamp sum can reach hundreds of, because power factor is low, had reactive current, so that total current becomes is very big.So the electric wire that draw in the shop will be used slightly, it is big that the capacity of circuit breaker is also wanted, and these problems have just produced.

In order to address these problems, illuminating industry has also been developed the High Power Factor type stabilizer that improves input power factor itself.But, using the High Power Factor stabilizer, cost is very high, and is again large component, the many lamps of a cabinet as showcase (8 feet long cupboard average 12), when using stabilizer, installing space also is a big problem.

Summary of the invention

Therefore, the objective of the invention is to, the display cabinet illumination device that provide cheap, small-sized, is not subjected to space constraints when being installed on showcase, it is characterized in that, in order to obtain necessary secondary voltage, use low power factor type stabilizer, be that autotransformer reduces electric capacity, simultaneously, magnetic shunt is set, the effect of choking-winding of having held concurrently of the secondary coil of transformer, and power-factor improvement electric capacity is set in parallel with power supply, form the circuit (High Power Factor type circuit) that power factor is improved with this.

In order to reach described purpose, in the present invention, installation be used for the throwing light on multilevel open type showcase of many illuminating lamps of storeroom has following feature, the starting circuit of described illuminating lamp is used the low power factor stabilizer, in order to improve power factor, be installed in parallel capacitor with the power supply of low power factor stabilizer.And, also has following feature, improve the electric capacity that power factor is used, be installed on the showcase main body of primary side of lighting switch, perhaps, use autotransformer in order to obtain low power factor suppressor activation illuminating lamp and to make it keep the required secondary voltage of build-up of luminance, reduce electric capacity, simultaneously, magnetic shunt is set, the secondary coil of transformer is worked as choke simultaneously, realize miniaturization.

Use said structure, because stabilizer itself is the low power factor type, so price is low, and also small-sized, be not subjected to spatial limitation when being installed on showcase.

And, after selecting the electric capacity that matches with the number that is used for the illuminating lamp of showcase, as long as this electric capacity (in a secondary side of lighting switch) in parallel with power supply is installed, power factor just can be improved, and can obtain input power factor identical when using High Power Factor type stabilizer.

Description of drawings

Fig. 1 is the side view of the section of an expression example using multilevel open type showcase of the present invention.

Fig. 2 is to use low power factor type stabilizer of the present invention to seek the basic circuit diagram of the starting circuit of high-output power factor.

Fig. 3 is the circuit diagram the when starting circuit of using low power factor type stabilizer of the present invention to seek to improve power factor is applied to use the multilevel open type showcase of many fluorescent lamps.

Fig. 4 is the basic circuit diagram of existing starting circuit.

Embodiment

According to Fig. 1 to Fig. 3 one embodiment of the invention are illustrated below.

At first, Fig. 1 is the cross-section side view of an example of the expression multilevel open type showcase that uses lighting device of the present invention.The open-type show cabinets 1 of commodity in storeroom such as low-temp storage, display chilled food, fresh food are that monolithic molding is made, open-front becomes shell 2, the inner filling heat-barrier material of " " font to form, its installed inside has wainscot 3, forms circulating cold air passage 4 between shell 2 and inner panel 3.

At the top of aforementioned shell 2 front end, the ceiling of inner panel 3 partly is provided with cold air blow-off outlet 5, cold air blows out, forms gas curtain down through this outlet commutation, blows out thus, blows in suction inlet 6 admission passages 4 of cold air through being located at the bottom front end in the open-type show cabinet 1.In the passage 4 of bottom, air blast 7 is set and cooler 8 that cold air that this air blast 7 is carried cools off again, this cold air is blown out from blow-off outlet 5 through passage 4 once more by air blast 7.By means of this circulating cold air, be disposed at display rack 10,10 in the goods storing chamber 9 of open-type show cabinet 1 ... keep low temperature with commodity on the base frame 11 (not shown go out).And, thrown light in order to make storeroom 9, in this multilevel open type showcase 1, the smallpox board of inner panel 3 and display rack 10,10 ... the front end downside many fluorescent lamp L are installed, L ...

So, in the basic circuit of the lighting device of present embodiment, as shown in Figure 2, when using autotransformer T in order to obtain necessary secondary voltage, reducing electric capacity, magnetic shunt is set, make the secondary coil T of transformer T ₂Also have the effect of choke concurrently, seek equipment miniaturization with this.That is to say, in the present embodiment, in the starting circuit of fluorescent lamp L, by primary coil T ₁And secondary coil T ₂The autotransformer that constitutes and be installed on this primary coil T ₁And secondary coil T ₂Between magnetic shunt P constitute low power factor stabilizer ST, in order to improve power factor, be installed in parallel the capacitor C that power factor is used of improving capacious with the power supply E of this low power factor stabilizer ST.So this low power factor stabilizer ST (transformer T) becomes to be connected in series with the filament of fluorescent lamp L, and is connecting starter G on this fluorescent lamp L.

This starter G be with the build-up of luminance of existing example shown in Figure 4 with switch S with prevent the capacitor C that noise is used ₀(0.01～0.006 μ f) and the starter that links into an integrated entity are identical, starter one energising, and behind the filament pre-heating, the surge voltage that starter G produces just makes fluorescent lamp L light.And under the situation of transformer type, condenser voltage is by the coil discharge of transformer, so do not need discharge resistance.

But, under the situation of multilevel open type showcase shown in Figure 1, particularly use many fluorescent lamp L, use High Power Factor type stabilizer to improve power factor, it is very high that price just becomes.Therefore, as shown in Figure 3, use low power factor stabilizer ST, the electric capacity that is used to improve power factor that the number of (in the primary side of the lighting switch LS that is installed in each showcase) in parallel with power supply E installation capacitance and fluorescent lamp L matches, so power factor is improved, the input power factor when reaching as use High Power Factor type stabilizer.Therefore, as long as there is the expense of comparatively cheap electric capacity just much of that, can reduces the cost effectively and make equipment miniaturization.Additional disclosure, average every of 8 feet showcases of 12 40 watts fluorescent lamp are installed, are under the situation of stabilizer of 1 Φ 100V at power supply, the current value of low power factor is 11.2A, and the current value behind the power-factor improvement is 6.7A (using the electric capacity of two 100 μ f).And, be that the current value of low power factor is 5.04A under the situation of stabilizer of 1 Φ 200V at power supply, and the current value behind the power-factor improvement is 3.31A (using the electric capacity of two 18uf).And in Fig. 3, the circuit structure of fluorescent lamp L and starter G and described Fig. 2's is routine identical.

As mentioned above, capacitance when forming high power factor circuit, can reduce with the way that raising is added in the voltage on the electric capacity, but in the present embodiment, select jumbo electric capacity and power supply to be connected in parallel, to use circuit simple low-power factor stabilizer on the contrary.And, improve the electric capacity that power factor uses the installation site, be chosen on the showcase main body of the primary side that is installed on the lighting switch in each showcase, thereby can use lighting switch to control the illumination of each showcase respectively, the selection of low power factor specification, High Power Factor specification simultaneously becomes simple.

As implied above, use display cabinet illumination device of the present invention, because stabilizer itself is the low power factor type,, when being installed on showcase, be not subjected to spatial limitation so price is low, volume is little.

And, after selecting the capacitor that matches with the illuminating lamp number that is used for showcase, as long as this capacitor (in the primary side of lighting switch) in parallel with power supply is installed, the input power factor when power factor just can be improved, can obtain as use High Power Factor type stabilizer.Consequently, total current diminishes, as long as the comparatively cheap capacitor expense of cost is just much of that, the electric wire line footpath that use in the shop also needn't be too thick, and the capacity of circuit breaker also can reduce, thereby can cut down the electrical construction expense of working site significantly.

Claims

1. display cabinet illumination device, the multilevel open type showcase that is used for installing many illuminating lamps goods storing chamber of throwing light on, it is characterized in that, the starting circuit of aforementioned illuminating lamp is used low power factor type stabilizer, in order to improve power factor, be installed in parallel capacitor with the power supply of this low power factor stabilizer; Described low power factor stabilizer, in order to obtain keeping the necessary secondary voltage of illuminating lamp build-up of luminance, use autotransformer, electric capacity is reduced, simultaneously between autotransformer primary coil and secondary coil, magnetic shunt is set, makes the secondary coil of transformer have the effect of choking-winding concurrently.

2. display cabinet illumination device according to claim 1 is characterized in that, describedly improves the capacitor that power factor uses and is installed on the showcase main body of illumination with the primary side of switch.