CN2254616Y

CN2254616Y - Flip-chip radiating electronic ballast

Info

Publication number: CN2254616Y
Application number: CN 95228041
Authority: CN
Inventors: 彭新治
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-11-29
Filing date: 1995-11-29
Publication date: 1997-05-21
Anticipated expiration: 2005-11-29

Abstract

The utility model relates to a flip-chip radiating electronic ballast which is characterized in that two main heating elements (4) which are arranged on a printed circuit board (3) are tightly fixed at the left and the right two sides of a top cover (10) by fastening screws (5) through heat conducting pressed aluminum sheets (9) and heat dissipation insulating sheets (6), a front upper edge and a back upper edge of a bottom cover (11) are respectively contacted with heat transfer fins (12) at the left and the right two sides of the upper part of the top cover, and the middle part of the bottom cover (11) is transversely provided with a plurality of heat radiation convection air vents (10). Because the utility model solves the heat radiation problem, the utility model has the advantages of good operating stability, little possibility of failure, compact structure, small size, light weight, simple production process, high productive efficiency, and low cost.

Description

Upside-down mounting heat dissipation type electric ballast

The utility model belongs to the electrical equipment that is used for the fluorescent lamp igniting, is specifically related to a kind of upside-down mounting heat dissipation type electric ballast.

Since electric ballast came out, because its power factor height, reactive loss was little, power saving, the voltage adaptation scope is big, good operating stability, for vast low-voltage area, bring great convenience especially to the user, and, volume is little, and is in light weight, saves material, be subjected to users' welcome deeply, but, cause job stability relatively poor because the heat dissipation problem of existing electric ballast fails to properly settle so far, also break down easily, influenced the extensive use of electric ballast.

Chinese patent 88218286.2 utilizes top cover to dispel the heat, and will stream circle and separate with printed circuit board (PCB), causes the difficulty of fit on, has reduced production efficiency, has increased production cost; The housing holding screw is built on stilts with whole ballast, and heat radiation is very limited; Owing to adopt full-closed structure, make internal heat outwards convection current disperse, non-characteristic component ambient temperature surpasses element loads, and can cause ballast may break down job insecurity.

Chinese patent " extraneous auxiliary heat dissipation electric ballast " (94217619.7) adopts on the chassis and makes auxiliary heat dissipation with the fixing main heater element of screw and by the certain thickness metal material in the external world, but when practical application, direction of heat flow upwards in the electric ballast, and the electric ballast chassis upwards, top cover is downward, and the chassis heat-transfer effect is relatively poor, so actual the heat transfer only concentrates on 2 points of the fixing main heater element of screw, therefore this design, heat-transfer effect are still not really desirable; Its convection current pore design is gone into to introflexion, has stopped that on the contrary the heat in the ballast is distributed to external radiation; And the production technology more complicated of chassis and heat conduction compressing tablet, operation is various, the production cost height.

The utility model is at the deficiency of existing electric ballast design of heat transfer, and a kind of good heat dissipation effect, stable work in work, upside-down mounting heat dissipation type electric ballast that cost is low are provided.

Upside-down mounting heat dissipation type electric ballast of the present utility model, comprise top cover, bottom and be assembled with the printed substrate of electric component, the weldering that it is characterized in that printed substrate is ironed the part one side and is close in the top cover by insulating board or high insulation gummed paper, distributing of part heat ironed in the weldering that is beneficial to element, be erected on the printed substrate two main heater elements (triode) respectively with holding screw by heat conduction jewelling sheet, the radiating insulating sheet is fastened on the top cover left and right sides, the upper edge, front and back of described bottom contacts with the heat transfer fin of both sides, front and back, top cover top, and its middle part is along laterally having some heat radiation convection current pores, a large amount of heats that main heater element sent are by having the jewelling sheet of fine heat-transfer effect, radiating insulating sheet and heat transfer fin, heat radiation convection current pore on the bottom distributes, to realize the target of ballast efficiently radiates heat of the present utility model.

Upside-down mounting heat dissipation type electric ballast of the present utility model, by adopting special-purpose heat conduction jewelling sheet of new generation, radiating insulating sheet and novel design, make full use of each part heat radiation of whole metal shell, and, its internal structure reversing assembling, the weldering of the printed circuit board (PCB) of ballast is ironed part and is close to the top cover heat radiation downwards, main heater element is fastened on roof side, the heat that forms main heater element can be by both sides jewelling sheet and top cover, vertically up diffusion heat radiation all around, solved preferably and failed the heat dissipation problem properly settled for a long time, therefore, ballast good operating stability not only, be difficult for breaking down, and, need not to make the compact conformation of ballast by adding the auxiliary heat dissipation material owing to good heat dissipation, volume is little, in light weight, all non-feature member can all be installed on one 20 * 77 millimeters the printed circuit board (PCB), its volume and weight only are the 20%-50% of other like product, and is small and exquisite and light, helps the variation of fluorescent lamp profile and purposes; Owing to got rid of the built-in radiator of existing electric ballast or added the auxiliary heat dissipation design, make production technology simple, the production efficiency height greatly reduces cost.

Below in conjunction with accompanying drawing upside-down mounting heat dissipation type electric ballast of the present utility model is described further:

Fig. 1 is the structural representation of upside-down mounting heat dissipation type electric ballast of the present utility model

Fig. 2 is the local enlarged diagram of Fig. 1.

Fig. 3 is the structural representation of upside-down mounting heat dissipation type electric ballast top cover of the present utility model.

Fig. 4 is the structural representation of upside-down mounting heat dissipation type electric ballast bottom of the present utility model.

Fig. 5 is the circuit diagram of the embodiment of upside-down mounting heat dissipation type electric ballast of the present utility model.

Such as Fig. 2--shown in 4, flip-chip radiating electronic ballast of the present utility model comprises Top cover [1], bottom [11] and assembling have the printed substrate [3] of electrical equipment, track The weldering of road plate [3] is ironed part and simultaneously is close to the top by insulating board or high insulation gummed paper [2] In the lid [1], be erected at two main heater elements [4] difference on the printed substrate [3] Be fastened on top cover with holding screw [5] by heat conduction jewelling sheet [9], heat radiation insulating trip [6] [1] left and right sides, on the front and back of bottom [11] along with top cover top before and after the heat transfer of both sides Fin [12] contact, and its middle part is along laterally having some row's radiating convection pores [10].

Embodiment:

By circuit diagram shown in Figure 5, R1 is 470K Ω, 1/4W; R2=R3,2.2 Ω, 1/4W; R4=R5,4.7 Ω, 1/4W; C1,10MF, 400V; C2,0.1MF, 250V, 104K Ω; C3=C5,3.3n, 3300PF, 630V; C4,0.033MF, 630V; Triode G1=G2, BUX84 (MJE-13003); Diode D1-D4, D5, IN4007; Inductance L 1, B, L2,10 * 2k5R, EI1901; Shell adopts aluminium sheet to be stamped to form.L1, the high harmonic inhibition coil is with 0.12 square millimeter hookup wire threading 2 * 12 circles on the R5K magnet ring; L2, choke, with 0.38 millimeter enamelled wire on EI-1901 magnetic skeleton around 180 circles, 0.3 millimeter of width of air gap; B, oscillation transformer, with 0.12 square millimeter hookup wire threading on the R5K magnet ring, 1-2,3-4 phase line and around 3 circles, the 5-6 single line is around 8 circles.

Claims

1. upside-down mounting heat dissipation type electric ballast, comprise top cover [1], bottom [11] and be assembled with the printed substrate [3] of electric component, the weldering that it is characterized in that being assembled with the printed substrate [3] of electric component is ironed part and simultaneously is close in the top cover [1] by insulating board or high insulation gummed paper [2], be erected on the printed substrate [3] two main heater elements [4] respectively with holding screw [5] by heat conduction jewelling sheet [9], radiating insulating sheet [6] is fastened on top cover [1] left and right sides, the upper edge, front and back of described bottom [11] contacts with the heat transfer fin [12] of both sides, front and back, top cover top, and its middle part is along laterally having plurality of rows heat radiation convection current pore [10].