CN201655752U

CN201655752U - High-frequency electrodeless lamp

Info

Publication number: CN201655752U
Application number: CN2010201116500U
Authority: CN
Inventors: 肖仕维
Original assignee: LIAONING BAOLIN GROUP ENERGY SAVING CO Ltd
Current assignee: LIAONING BAOLIN GROUP ENERGY SAVING CO Ltd
Priority date: 2010-02-10
Filing date: 2010-02-10
Publication date: 2010-11-24
Anticipated expiration: 2020-02-10

Abstract

The utility model relates to a high-frequency electrodeless lamp comprising a bulb, a lamp holder, a power supply circuit and a coupling circuit. The bulb is connected to the lamp holder, the coupling circuit is arranged on the lamp holder and extended into the bulb, and the coupling circuit is connected with the output end of the power supply circuit. The power supply circuit is provided with a power factor correcting circuit and a lighting inverting circuit, the power factor correcting circuit comprises a filtering circuit, a rectifying circuit and a power supply regulating circuit. The input end of the filtering circuit is connected with a mains supply, the output end of the filtering circuit is connected with the power supply regulating circuit through the rectifying circuit, the output end of the power supply regulating circuit is connected with the lighting inverting circuit, and the output end of the lighting inverting circuit is connected with the coupling circuit. The utility model has the advantages that pollution to the power supply circuit from high frequency oscillation is filtered, the power factor of the circuit is improved, the circuit has overcurrent protection, overvoltage protection, output short circuit protection and output open circuit protection, and a high-frequency power supply circuit is prevented from being damaged in an error state, thereby the service life of an electrical apparatus is prolonged.

Description

A kind of HF lamp without electrodes

Technical field

The utility model relates to a kind of lighting, a kind of specifically HF lamp without electrodes.

Background technology

Electrodeless electromagnetism lamp (electrodeless lamp) is based on the new type light source that electromagnetic induction and fluorescence gas discharge combine.It is made up of a higher-order of oscillation power supply, a power coupler and a foam.Foam is airtight, and an end falls in, and major-minor two mercurials are arranged in the cell-shell; Coupler be with special barred body material by fine finishining, be aided with high frequency coil again and combine.Higher-order of oscillation power circuit comprises that filter circuit, circuit of power factor correction and high-frequency oscillating circuits constitute.Wherein the high-frequency self-excitation oscillating circuit is made of LC and a pair of MOSFET, and the magnetic field that high-frequency oscillating circuits produces is in coupler is sent to foam, and excitated fluorescent powder sends visible light.But, sometimes because under the fragmentation of bulb, gas leakage or the state such as unusual, can be because voltage in the circuit, the unexpected variation of electric current causes the damage of MOSFET on the power circuit, thereby has destroyed power circuit.

The utility model content

State can damage weak points such as its high-frequency power supply circuit because the fragmentation of bulb, gas leakage etc. are unusual etc. at the electrodeless lamp that exists in the prior art, and the technical problems to be solved in the utility model provides the HF lamp without electrodes that a kind of high-frequency power supply circuit can not suffer damage when running into abnormality.

For solving the problems of the technologies described above, the technical solution adopted in the utility model is:

A kind of HF lamp without electrodes of the utility model comprises bulb, lamp socket, power circuit and coupling circuit, and wherein bulb is connected on the lamp socket, and coupling circuit places on the lamp socket and extends to bulb, and coupling circuit is connected with the output of power circuit.

Described power circuit has circuit of power factor correction and the inverter circuit of lighting a lamp, described circuit of power factor correction comprises filter circuit, rectification circuit, power supply regulator circuit, wherein the input of filter circuit links to each other with civil power, output is connected to power supply regulator circuit through rectification circuit, the output of power supply regulator circuit links to each other with the inverter circuit of lighting a lamp, and the output of the inverter circuit of lighting a lamp is connected to coupling circuit.

Described power supply regulator circuit comprises power factor corrector and booster converter, wherein the input of power factor corrector is connected to the sampled signal of rectification circuit output and the secondary feedback signal of booster converter, output links to each other with the control pin of field effect transistor, the source electrode of field effect transistor is connected to the elementary of booster converter, and drain electrode is by the 8th resistance R 8 ground connection; The elementary power supply that output has been proofreaied and correct through the 3rd diode of booster converter is to the inverter circuit of lighting a lamp.

The described inverter circuit of lighting a lamp comprises delayed startup circuit, frequency conversion drive circuit, booster circuit and output circuit, the input of delayed startup circuit is connected to working power, output links to each other with the frequency conversion drive circuit, and the output of frequency conversion drive circuit is connected to output circuit by booster circuit.

Described delayed startup circuit has sample resistance and delay capacitor, behind sample resistance reception supply voltage, is connected to delay capacitor, and delay capacitor links to each other with the diac group simultaneously, and the output of diac group is connected to the frequency conversion drive circuit.

Described frequency conversion drive circuit has driving transformer, and the secondary winding of driving transformer links to each other with half-bridge drive circuit in the booster circuit as drive signal.

The half-bridge drive circuit of described booster circuit for constituting by the 2nd, 3 field effect transistor and the 4th, 5 inductance, wherein the source electrode of the 2nd field effect transistor is connected to working power, drain electrode links to each other with the source electrode of the 3rd field effect transistor, link to each other with the 5th, 4 inductance that are connected in series simultaneously, the output of the 4th inductance is connected to output circuit.

Described output circuit comprises the 18th electric capacity, and it receives the high frequency voltage after booster circuit boosts, and output links to each other with coupling circuit.

Also has abnormity protection circuit; comprise the 5th inductance, the 10th diode, the 6th voltage stabilizing didoe, the 4th controllable silicon and the 3rd field effect transistor; wherein the sampled signal of the 5th inductance is connected to the negative pole of the 6th voltage stabilizing didoe by the 10th diode and the 22nd resistance; the positive pole of the 6th voltage stabilizing didoe extremely links to each other with the control of the 4th silicon controlled; the 4th silicon controlled minus earth, anode are connected to the control utmost point of the 3rd field effect transistor.

The utlity model has following beneficial effect and advantage:

1. the utility model power unit adopts filtering and circuit of power factor correction; the filtering 2.65MHz higher-order of oscillation is to the pollution of power circuit; improve the power factor of circuit; and make it have overcurrent, overvoltage protection; output short-circuit, break protecting; high-frequency power supply circuit can not suffered damage when running into abnormality, improved the useful life of electric elements.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

As shown in Figure 1, the utility model comprises bulb 1, lamp socket 2, power circuit 3 and coupling circuit 5, and wherein bulb 1 is connected on the lamp socket 2, and coupling circuit 5 places on the lamp socket 2 and extends to bulb 1, and coupling circuit 5 is connected with the output of power circuit 3.

As shown in Figure 2, described power circuit 3 has circuit of power factor correction and the inverter circuit of lighting a lamp, circuit of power factor correction comprises filter circuit, rectification circuit, power supply regulator circuit, wherein the input of filter circuit links to each other with civil power, output is connected to power supply regulator circuit through rectification circuit, the output of power supply regulator circuit links to each other with the inverter circuit of lighting a lamp, and the output of the inverter circuit of lighting a lamp is connected to coupling circuit 5.

The two-stage type power filter network that filter circuit in the circuit of power factor correction is made up of the 1st, 2 inductance L 1, L2 and the 1st～6 capacitor C 1, C2, C4, C5, C6, C3, the frequency that suppresses mainly is the about 50kHz of operating frequency and the DC/AC switching frequency 2.65MHz of circuit of power factor correction (PFC), and the high order harmonic component of these two frequencies.The 1st～3 capacitor C 1, C2, C3 also are X electric capacity, and the differential mode interference noise is bypassed; 1st, 2 inductance L 1, L2 are common mode choke, suppress common-mode noise; Electric capacity RV1, RV3, the 4th～5 capacitor C 4, C5 also are Y electric capacity, are used to suppress the radio noise of power transmission line secondary.RV2 is a varistor, is used for absorbing the spike overvoltage.

Rectification circuit in the circuit of power factor correction is a diode bridge rectifier circuit.

Power supply regulator circuit in the circuit of power factor correction comprises power factor corrector U1 and booster converter T1, wherein the input of power factor corrector U1 is connected to the sampled signal of rectification circuit output and the secondary feedback signal of booster converter T1, output links to each other with the control pin of field effect transistor V1, the source electrode of field effect transistor V1 is connected to the elementary of booster converter T1, and drain electrode is by the 8th resistance R 8 ground connection; The elementary power supply of exporting through the 3rd diode of having proofreaied and correct of booster converter T1 is to the inverter circuit of lighting a lamp.

Power factor corrector U1 is a power factor correction chip reliable and with low cost, and its application circuit as shown in Figure 2.Civil power obtains Rectified alternating current through filter circuit and rectification circuit.Promptly the 4th resistance R 4 is when the 10th capacitor C 10 charges to 10V to electric current by starting resistance, and U1 starts working.Dc pulse moving voltage after the rectification with the dividing potential drop of the 1st resistance R 1 as sampled signal, the multiplier through the 3. pin input U1 inside of power factor corrector U1.The dividing potential drop of VD on the 11st resistance R 11 and variable resistor WR delivered to the inverting input of the error amplifier of U1 inside through the 1. pin of power factor corrector U1, relatively amplify direct-flow error voltage of back output with the reference voltage of 2.5V, also be input to multiplier simultaneously.Electric current by power switch V1 is converted to voltage signal on source resistance R16, be input to the 4. pin of power factor corrector U1, and compares with the output voltage of multiplier.Pass through to peak value from zero with AC voltage, the output voltage power controlling factor correcting device U1 of multiplier is the threshold values of pin 4. sinusoidally, thereby makes the peak current of power switch V1 follow the tracks of ac input voltage, causes the load of correcting circuit to be resistive.

Because the control action of power factor corrector U1, make input current tightly follow AC voltage and change, be level and smooth sine wave.Simultaneously, pfc circuit is again a kind of booster type switching power supply, and the power of electrodeless lamp and luminous flux can not changed with the fluctuation of line voltage.

The described inverter circuit of lighting a lamp comprises delayed startup circuit, frequency conversion drive circuit, booster circuit and output circuit, the input of delayed startup circuit is connected to the power supply that working power is promptly proofreaied and correct, output links to each other with the frequency conversion drive circuit, and the output of frequency conversion drive circuit is connected to output circuit by booster circuit.

The delayed startup circuit of lighting a lamp in the inverter circuit has sample resistance R14, R15 and delay capacitor C16, behind sample resistance R14, R15 reception supply voltage, be connected to delay capacitor C16, delay capacitor C16 links to each other with the diac group simultaneously, and the output of diac group is connected to the frequency conversion drive circuit.

The frequency conversion drive circuit of lighting a lamp in the inverter circuit has driving transformer T2, and the secondary winding of driving transformer T2 links to each other with half-bridge drive circuit in the booster circuit as drive signal.

Light a lamp the half-bridge drive circuit of described booster circuit in the inverter circuit for constituting by the 2nd, 3 field effect transistor V2, V3 and the 4th, 5 inductance L 4, L5, wherein the source electrode of the 2nd field effect transistor V2 is connected to working power, drain electrode links to each other with the source electrode of the 3rd field effect transistor V3, link to each other with the 5th, 4 inductance L 5, the L4 that are connected in series simultaneously, the output of the 4th inductance L 4 is connected to output circuit.

The output circuit of lighting a lamp in the inverter circuit comprises the 18th capacitor C 18, and it receives the high frequency voltage after booster circuit boosts, and output links to each other with coupling circuit 5.

As described in Figure 2, the lamp inverter circuit is transformed to the high-frequency alternating current that uses for electrodeless lamp with the high voltage direct current of circuit of power factor correction (PFC) output.It is 2.2MHz～3.0MHz that the CISPR15 of International Electrotechnical Commission allows the frequency range to the magnetic field induction standard, and its centre frequency is 2.6MHz.PFC output dc voltage after the energized. be added on the delay capacitor C16 by sample resistance R14, R15, delay capacitor C16 begins charging.When institute's charging voltage on the delay capacitor C16 reached the breakover voltage of the 1st～9 trigger tube (DIAC) D1～D9, each trigger tube (DIAC) transferred conducting state to by shutoff.The stored electric charge of delay capacitor C16 is added on the elementary winding of oscillation transformer T2 through trigger tube (DIAC), in addition two windings make that the 2nd, 3 field effect transistor V2, V3 acquisition amplitude equate, the drive signal of 180 ° of phase phasic differences.When the 2nd field effect transistor V2 conducting, the 3rd field effect transistor V3 is compelled to turn-off and ends; During the 3rd field effect transistor V3 conducting, the 2nd field effect transistor V2 is compelled to again turn-off and ends.

The frequency of oscillation of inverter is determined jointly by the inductance value and the 2nd of oscillation transformer T2, input capacitance C27 and the building-out capacitor C28 of 3 field effect transistor V2, V3, the resonance frequency of lamp loop network must be identical with the resonance frequency of input circuit, and for example: resonance frequency is 2.65MHz.Also to optimize the amplitude and the waveform of the 2nd, 3 field effect transistor V2, V3 drive signal as possible, make himself power consumption drop to minimum.

Diode VD4 has two effects: the electric charge on the delay capacitor C16 that is used for during forward releasing prevents that inverter circuit from because of " common conducting " phenomenon appears in false triggering, shielding; In the time of oppositely, utilize the reverse current of reverse recovery time to be the oscillation transformer input signal.

4th, 5 inductance L 4, L5, the 18th, 21 capacitor C 18, C21 are resonant inductance and resonant capacitance, and they are important parameters in the design.The startup stage, the equivalent resistance of bulb is very big, series resonance takes place in the 4th, 5 inductance L 4, L5 the 18th, 21 capacitor C 18, C21, resonant circuit can form the ignition voltage of very high (about 3000V) at the lamp two ends.After electrodeless lamp ignites, enter normal operating phase, in the foam electric arc equivalent resistance at hundreds of ohms, after lamp current generates, resonant tank off resonance, the 18th, the resonance potential on 21C18, the C21 drops to the operating voltage of lamp.Lamp is lighted lamp is stablized in the back by the 4th, 5 inductance L 4L5 arc current.Meanwhile, because the frequency-selective filtering effect of output loop, the electric energy of lighting a lamp is the voltage and current of string ripple, and its frequency is the fundamental frequency of pumping signal.

When occurring that the bulb wiring comes off or during abnormality such as bulb gas leakage, electrodeless lamp can not normally start, the resonance circuit of igniting is in resonance condition always, and output frequency raises, and voltage raises.The electric current of inverter output increases to 3～5 times of normal current.If do not take effective safeguard measure, will cause light a lamp inverter and prime element circuit to burn because of overload, even cause smolder, accident such as explosion.Generation for fear of above-mentioned accident; the utility model also is provided with abnormity protection circuit; abnormity protection circuit as shown in Figure 2; comprise the 5th inductance L the 5, the 10th diode D10, the 6th voltage stabilizing didoe ZD6, the 4th controllable silicon Q4 and the 3rd field effect transistor V3; wherein the sampled signal of the 5th inductance L 5 is connected to the negative pole of the 6th voltage stabilizing didoe DZ6 by the 10th diode D10 and the 22nd resistance R 22; the positive pole of the 6th voltage stabilizing didoe DZ6 extremely links to each other with the control of the 4th controllable silicon Q4; the minus earth of the 4th controllable silicon Q4, anode are connected to the control utmost point of the 3rd field effect transistor V3.

When abnormality: in resonant inductance L4, draw the abnormal protection sampled voltage; by the 10th diode D10 rectification; 22nd, become control voltage after the dividing potential drop of 20 resistance R 22, R20; the direct voltage that on the 20th capacitor C 20, is risen in time; when this voltage just breakdown during greater than the voltage stabilizing value of the 6th voltage stabilizing didoe ZD6; the 4th controllable silicon Q4 conducting with the 3rd field effect transistor V3 grid and ground short circuit, forces half-bridge inversion circuit to quit work.And under normal condition, the voltage on the 19th capacitor C 19 does not also rise to the voltage stabilizing value of the 6th voltage stabilizing didoe ZD6, and lamp has just been lighted, and lamp is lighted the just off resonance of back resonant circuit, thereby the 6th voltage stabilizing didoe ZD6 is in cut-off state always.Can not obtain too big the operate time of protective circuit, was generally 0.5～1 second.C19, R21 play anti-interference effect, prevent that unidirectional silicon is because of the interference signal misoperation.

Above embodiment is only for the usefulness that the utility model is described, but not to restriction of the present utility model, person skilled in the relevant technique under the situation that does not break away from spirit and scope of the present utility model, can also be made various conversion or variation.Therefore, all technical schemes that are equal to also should belong to category of the present utility model, should be limited by each claim.

Claims

1. A high-frequency electrodeless lamp, characterized in that it comprises a bulb (1), a lamp holder (2), a power supply circuit (3) and a coupling circuit (5), wherein the bulb (1) is connected to the lamp holder (2) The coupling circuit (5) is placed on the lamp holder (2) and extends into the bulb (1), and the coupling circuit (5) is connected with the output end of the power circuit (3).

2. The high-frequency electrodeless lamp according to claim 1, characterized in that: the power supply circuit (3) has a power factor correction circuit and a lighting inverter circuit, and the power factor correction circuit includes a filter circuit, a rectifier circuit, a power supply The adjustment circuit, wherein the input end of the filter circuit is connected to the mains, the output end is connected to the power adjustment circuit through the rectification circuit, the output end of the power adjustment circuit is connected to the lighting inverter circuit, and the output end of the lighting inverter circuit is connected to the coupling circuit ( 5).

3. The high-frequency electrodeless lamp according to claim 2, characterized in that: the power adjustment circuit includes a power factor corrector (U1) and a boost converter (T1), wherein the input of the power factor corrector (U1) The terminal is connected with the sampling signal output by the rectifier circuit and the secondary feedback signal of the boost converter (T1), the output terminal is connected to the control pin of the FET (V1), and the source of the FET (V1) is connected to the boost The primary of the converter (T1), the drain is grounded through the eighth resistor R8; the primary of the boost converter (T1) outputs the calibrated power to the lighting inverter circuit through the third diode.

4. The high-frequency electrodeless lamp according to claim 2, characterized in that: the lighting inverter circuit includes a delay start circuit, a variable frequency drive circuit, a boost circuit and an output circuit, and the input terminal of the delay start circuit is connected with The output end of the working power supply is connected to the variable frequency drive circuit, and the output end of the variable frequency drive circuit is connected to the output circuit through the boost circuit.

5. The high-frequency electrodeless lamp according to claim 4, characterized in that: the delay start circuit has a sampling resistor (R14, R15) and a delay capacitor (C16), and receives power through the sampling resistor (R14, R15) After the voltage is connected to the delay capacitor (C16), the delay capacitor (C16) is connected to the trigger diode group at the same time, and the output terminal of the trigger diode group is connected to the variable frequency drive circuit.

6. The high-frequency electrodeless lamp according to claim 4, characterized in that: the variable frequency drive circuit has a drive transformer (T2), and the secondary winding of the drive transformer (T2) is used as a drive signal and a half-bridge in the booster circuit The drive circuit is connected.

7. The high-frequency electrodeless lamp according to claim 4, characterized in that: the boost circuit is composed of the second and third field effect transistors (V2, V3) and the fourth and fifth inductors (L4, L5) Half-bridge driving circuit, wherein the source of the second field effect transistor (V2) is connected to the working power supply, the drain is connected to the source of the third field effect transistor (V3), and at the same time connected to the fifth and fourth inductors (L5) connected in series , L4) are connected, and the output terminal of the fourth inductor (L4) is connected to the output circuit.

8. The high-frequency electrodeless lamp according to claim 4, characterized in that: the output circuit includes an eighteenth capacitor (C18), which receives the high-frequency voltage boosted by the booster circuit, and the output terminal is connected to the coupling circuit (5 ) connected.

9. The high-frequency electrodeless lamp according to claim 2, characterized in that it also has an abnormal protection circuit, including a fifth inductor (L5), a tenth diode (D10), a sixth Zener diode (DZ6), a fourth Thyristor (Q4) and the third field effect transistor (V3), in which the sampling signal of the fifth inductor (L5) is connected to the sixth Zener diode (DZ6) through the tenth diode (D10) and the twenty-second resistor (R22) The negative pole of the sixth Zener diode (DZ6) is connected to the control pole of the fourth thyristor (Q4), the cathode of the fourth thyristor (Q4) is grounded, and the anode is connected to the third FET (V3) control pole.