CN103474326A

CN103474326A - High-frequency electrodeless lamp based on micro-channel heat pipe

Info

Publication number: CN103474326A
Application number: CN2013103532299A
Authority: CN
Inventors: 李令言; 朱晓亮; 姜岩; 葛玲; 杨玉玲; 杨振
Original assignee: FENGTAI TECHNOLOGY DEVELOPMENT Co OF 16TH RESEARCH INSTITUTE OF CHINA ELECTRONICS TECHNOLOGY GROUP Corp; CETC 16 Research Institute
Current assignee: FENGTAI TECHNOLOGY DEVELOPMENT Co OF 16TH RESEARCH INSTITUTE OF CHINA ELECTRONICS TECHNOLOGY GROUP Corp; CETC 16 Research Institute
Priority date: 2013-08-14
Filing date: 2013-08-14
Publication date: 2013-12-25

Abstract

The invention discloses a high-frequency electrodeless lamp based on a micro-channel heat pipe. The high-frequency electrodeless lamp comprises a high frequency generator, an electromagnetic coupler, a heat pipe, a foam body, a heat dissipation fin and a foam body pedestal. A conventional copper tube is replaced by the micro-channel heat pipe adopted by the coupler so that heat dissipation effects of the coupler are improved. By using the high-frequency electrodeless lamp provided by the invention, the working temperature of the coupler can be effectively reduced, the coupling efficiency and the stability of a bulb are enhanced, and possibilities are provided for creating a larger-power high-frequency electrodeless lamp.

Description

A kind of HF lamp without electrodes based on microchannel thermotube

Technical field

The present invention relates to lighting, be specifically related to a kind of alveolitoid HF lamp without electrodes of dispelling the heat good.

Background technology

Along with the contradiction of sustained economic growth and shortage of resources, energy-saving and emission-reduction more and more become the trend of illuminating industry, and have energy-conservation and long-life advantage as the fluorescent lamp without electrode, it works of Novel electric light source.HF lamp without electrodes is comprised of three parts: radio-frequency generator, coupler and foam.At first radio-frequency generator is converted to civil power the high frequency strong voltage, and is transferred to coupler; The function of coupler, just as a transmitting antenna, is coupled into bulb by high-frequency signal.Under the effect of high frequency magnetic field, the loss (sluggish loss and eddy current loss) that coupler excitation inductance produces can make coupler temperature fast rise, once temperature surpasses the Curie temperature of magnetic material, can cause the material loss of excitation, coil current sharply increases, finally make switching tube puncture, cause irreversible destruction.Due to this particularity of Non-polarized lamp, the heat radiation of power coupler is that the restriction Non-polarized lamp is broken through powerful bottleneck all the time.

Summary of the invention

Large for existing Non-polarized lamp caloric value, the problem that reliability is low, the invention provides a kind of HF lamp without electrodes design of dispelling the heat good, is intended to reduce the coupler working temperature, improves coupling efficiency.

In order to achieve the above object, the present invention is by the following technical solutions:

A kind of HF lamp without electrodes design based on microchannel thermotube, comprising: radio-frequency generator, electromagnetic coupler, heat pipe, foam and radiating fin; Described electromagnetic coupler and close contact nested with the heat pipe upper end, induction coil directly is wrapped on magnet, and lead-out wire is electrically connected to radio-frequency generator, heat pipe lower end and radiating fin sealing laminating.

Described radio-frequency generator comprises electric source filter circuit, circuit of power factor correction, high-frequency inverter circuit.

Described electromagnetic coupler magnetic core is high frequency ferrite, and the coil direct winfing is on magnetic core.

Described heat pipe is the copper pipe that is provided with capillary wick, and inside heat pipe fills appropriate working medium, and consideration winter environment temperature is low avoids heat pipe freezing, chooses the working medium that freezing point is lower.

Described heat pipe is for better nested with the coupler magnetic core, and middle and upper part has been welded a circle supporting seat and fixed coupler, makes heat pipe and coupler to fit tightly, and the heat that is conducive to the coupler generation is derived by heat pipe.

Described radiating fin middle part has aperture, and the condensation end of heat pipe inserts in the hole and is close to hole wall, and fin absorbs the heat of heat pipe derivation and is dispersed in environment.

Key technology of the present invention is: coupler is nested in the evaporation ends of heat pipe, the heat produced is absorbed by the heat pipe evaporation ends, working medium is heated vaporization, the working medium be vaporized can flow to condensation end, heat is absorbed by the radiator that is nested in condensation end of heat pipe by heat conduction again, through free convection, to environment, leaves.Working medium through condensation is got back to evaporation ends along capillary wick again, forms circulation and constantly the heat of coupler generation is fallen apart in environment.

The invention has the beneficial effects as follows: adopt heat pipe and fin as heat abstractor, can reduce fast and effectively coupler

Working temperature, the sealing of heat pipe and radiating fin laminating, make coupler closely nested with heat pipe by packing ring, all greatly improved radiating efficiency, guaranteed stability and the reliability of Non-polarized lamp work, may for manufacturing that high-power electrodeless lamp provides.

The accompanying drawing explanation

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.

Fig. 1 is whole lamp outside drawing.

Fig. 2 is the discrete figure outside drawing of coupler and heat sink.

Fig. 3 is the radio-frequency generator circuit structure diagram.

Fig. 4 is the electric source filter circuit figure of radio-frequency generator.

Fig. 5 is the APFC figure of radio-frequency generator.

Fig. 6 is inverter circuit and the protective circuit figure of radio-frequency generator.

Embodiment

Referring to Fig. 1, a kind of HF lamp without electrodes design based on microchannel thermotube.Comprise radio-frequency generator 1, electromagnetic coupler 2, heat pipe 3, foam 4, radiating fin 5.Electromagnetic coupler 2 is nested in heat pipe 3 upper ends, is placed in the cavity of foam 4, heat pipe lower end and radiating fin 5 sealing laminatings, and foam 4 is connected with pedestal 6 screw sockets, and is fixed on fin 5 by the installing hole on pedestal.

Referring to Fig. 2, the magnetic tube 24 that electromagnetic coupler 2 magnetic cores are the high frequency ferrite material, induction coil 23 directly is wrapped on magnetic core 24, and lead-out wire is electrically connected to radio-frequency generator 1.The heat pipe middle and upper part has been welded the copper packing ring 22 of a circle and has been supported coupler 2, electromagnetic coupler magnetic core 24 and close contact nested with heat pipe 3 upper ends, and the heat that is conducive to generation is derived effectively by heat pipe.Radiating fin 5 is aluminum material, adopt the contact area of fin structure increase and air, fin 5 centers have aperture 21, and directly insert in aperture 21 the heat pipe lower end, with radiating fin sealing laminating, the heat that makes heat pipe derive better carries out convection current by fin and air.

Described heat pipe is a copper tube that is provided with capillary wick, and being nested in electromagnetic coupler one end is evaporation ends, and inserting radiating fin one end is condensation end.Inside heat pipe fills appropriate working medium, and consideration winter environment temperature is low avoids heat pipe freezing, chooses the working medium that freezing point is lower.Coupler is nested in the evaporation ends of heat pipe, the heat produced is absorbed by the heat pipe evaporation ends, and working medium is heated vaporization, and the working medium be vaporized can flow to condensation end, heat is absorbed by the radiating fin that is nested in condensation end of heat pipe by heat conduction again, through free convection, to environment, leaves.Working medium through condensation is got back to evaporation ends along capillary wick again, forms circulation and constantly the heat of coupler generation is fallen apart in environment.Finally reach the purpose that reduces the coupler working temperature.

Referring to Fig. 3, radio-frequency generator comprises electric source filter circuit, circuit of power factor correction, and high-frequency inverter circuit three parts, physical circuit figure is respectively as Fig. 4, and Fig. 5, shown in Fig. 6.

Referring to Fig. 4, electric source filter circuit comprises rectification and EMI filtering two parts, and NTC is thermistor, is used for surge current suppression, and RV is piezo-resistance, for overvoltage protection.C1, C2 are differential mode capacitor, and L1, L2 are the differential mode filter inductance, main filtering low-frequency interference signal, and C3, C4 are common mode filtering electric capacity, T1 is the common mode filtering inductance, suppresses the disconnected interference spike of high frequency.Alternating current enters bridge rectifier afterwards through EMI two-way " filtration ", through capacitor C 6 filtering ingoing power factor correcting circuits.

Referring to Fig. 5, circuit of power factor correction adopts FAN7527 critical current pattern passive power factor corrective control chip, and this circuit is more ripe available circuit, and it will not go into details.

Referring to Fig. 6, high-frequency inverter circuit adopts the self-oscillasion semi-bridge circuit.R18, R19, R20, C14 and trigger tube DB1, DB2 form start-up circuit, when the C11 both end voltage reaches the trigger tube threshold value, the trigger tube conducting, produce induced electromotive force by the T1 transformer, cause the conducting in turn of Q2 and Q3, make the sense of current on start-up capacitance C19 constantly change, cause that series resonance occurs for resonant network L6 and C19, produces high tension ignition pulse.D12, R22, R23, C12, D11, ZD2 form protective circuit, when bulb break or gas leakage, make rapidly resonant circuit stop, the cutoff high signal.To reduce peak voltage, improve circuit stability at Q2 and Q3 grid series connection small resistor R24 and R25.

Above are only embodiments of the invention, to one skilled in the art, the present invention has multiple change and variation.Allly within invention thought of the present invention and principle, make any modification, be equal to replacement, improve etc., within all should being included in protection scope of the present invention.

Claims

1. the HF lamp without electrodes based on microchannel thermotube, is characterized in that: comprise radio-frequency generator (1), electromagnetic coupler (2), heat pipe (3), foam (4), radiating fin (5) and foam pedestal (6); Described electromagnetic coupler is nested with the heat pipe upper end and contact, and induction coil is wrapped on magnet, and lead-out wire is electrically connected to radio-frequency generator, heat pipe lower end and radiating fin sealing laminating.

2. the HF lamp without electrodes based on microchannel thermotube according to claim 1, it is characterized in that: described radio-frequency generator (1) comprises electric source filter circuit, circuit of power factor correction and high-frequency inverter circuit; The input of described electric source filter circuit directly connects civil power, suppresses the electromagnetic interference of power end, and input voltage is carried out to rectifying and wave-filtering; Described circuit of power factor correction input connects described electric source filter circuit output, and alternating current is converted to direct voltage, and output is connected with the input of high-frequency inverter circuit; Described high-frequency inverter circuit is converted to high-frequency alternating current by the output direct current of circuit of power factor correction, and output is connected with the coupler coil.

3. the HF lamp without electrodes based on microchannel thermotube according to claim 1, it is characterized in that: the magnetic core of described electromagnetic coupler (2) is high frequency ferrite, and the coil direct winfing is on magnetic core.

4. the HF lamp without electrodes based on microchannel thermotube according to claim 1 is characterized in that: described heat pipe (3) is for being provided with the copper tube of capillary wick, and the working medium that appropriate freezing point is lower is filled in inside.

5. the HF lamp without electrodes based on microchannel thermotube according to claim 1 is characterized in that: described heat pipe middle and upper part has been welded the copper packing ring of a circle and has been supported coupler.

6. the HF lamp without electrodes based on microchannel thermotube according to claim 1, it is characterized in that: described radiating fin (5) middle part has aperture, the condensation end of described heat pipe (3) inserts in the hole and is close to hole wall, and fin absorbs the heat of heat pipe derivation and is dispersed in environment.