CN202679767U - Electronic ballast for electrodeless lamp - Google Patents

Electronic ballast for electrodeless lamp Download PDF

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Publication number
CN202679767U
CN202679767U CN 201220342494 CN201220342494U CN202679767U CN 202679767 U CN202679767 U CN 202679767U CN 201220342494 CN201220342494 CN 201220342494 CN 201220342494 U CN201220342494 U CN 201220342494U CN 202679767 U CN202679767 U CN 202679767U
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pin
chip
apfc
resistance
effect transistor
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CN 201220342494
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Chinese (zh)
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张新华
张若煜
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University of Shaoxing
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University of Shaoxing
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Abstract

The utility model discloses an electronic ballast for an electrodeless lamp, comprising a rectifying unit, an active power factor correction circuit and a half-bridge inverter circuit, wherein the rectifier circuit is connected to an alternating-current commercial power, rectified voltage is connected to the active power factor correction circuit, and the active power factor correction circuit is connected with the half-bridge inverter circuit, which is finally connected to the electrodeless lamp. The electronic ballast for the electrodeless lamp in the utility model can be used to realize electrodeless startup and steady-state constant power control.

Description

A kind of electronic ballast of electrodeless lamp
Technical field
The utility model relates to the Non-polarized lamp technical field, and is special relevant with a kind of electronic ballast of electrodeless lamp.
Background technology
Non-polarized lamp structurally is comprised of three parts, i.e. radio-frequency generator (high frequency electric source), power coupler and scribble the glass cell-shell of fluorescent RE powder.
Before Non-polarized lamp was not yet lighted, gas was equal to dielectric in the fluorescent tube, and the secondary disconnection of excitation transformer coil, so same pure inductances such as transformer this moments.When inductance flows through high-frequency current, will set up high frequency magnetic field in the inductance core.According to maxwell's Theory of Electromagnetic Field, around the magnetic flux of alternation, will generate the electric field of vortex, this eddy electric field can drive a small amount of free charge in the fluorescent tube.When the intensity of eddy electric field was enough large, free charge meeting that is accelerated was so that the mercury atoms in the fluorescent tube causes the free charge in the fluorescent tube to get more and more.At last, cause avalanche effect, plasma current can be controlled oneself in the fluorescent tube, and in the mercury ion ionization process, can produce ultra-violet radiation, like this with regard to the fluorescent material on the exciter lamp tube wall, sends visible light, and lamp will be lit.
After Non-polarized lamp was lit, the conductivity of gas increased in the electrodeless lamp tube, and excitation transformer is by the elementary secondary transferring energy of fluorescent tube of giving.The electric charge of high-frequency alternating magnetic field in the excitation transformer in the alternation eddy electric field continuation driving fluorescent tube of discharge tube internal induction, the fluorescent tube plasma current is increasing, the mercury ion of ionization is also more and more, is limited in certain scope by the resonant inductance in the electric ballast at last.Electric energy in the ballast is passed in the electrodeless lamp tube endlessly by excitation transformer, and Non-polarized lamp sends lasting visible light.
This shows, electron rectifier opens great role in the Non-polarized lamp course of work, and the inventor has done research for the Non-polarized lamp commutation technique, designs a kind of electronic ballast of electrodeless lamp, and this case produces thus.
The utility model content
Main purpose of the present utility model provides a kind of electronic ballast of electrodeless lamp, realizes electrodeless startup, the permanent power control of stable state.
In order to achieve the above object, the utility model is achieved through the following technical solutions:
A kind of electronic ballast of electrodeless lamp comprises rectification unit, APFC, half-bridge inversion circuit; Rectification circuit connects electric main, and the voltage after the rectification accesses in the APFC, and APFC connects half-bridge inversion circuit, finally is connected on the Non-polarized lamp.
Described rectification unit is the bridge circuit that four diodes consist of, and its input termination electric main is connected with APFC on the output; APFC comprises chip I R1150, some resistance, some electric capacity, field effect transistor; Wherein the GATE pin of chip I R1150 connects the output voltage two ends by field effect transistor; The external operating voltage of VCC pin of chip I R1150, and pass through capacity earth; The VFB pin of chip I R1150 is connected to the output voltage two ends by the dividing potential drop series resistance; The COMP pin of chip I R1150 is by series resistance and capacity earth, and at the resistance of series connection and electric capacity two ends an electric capacity in parallel again; The OVP pin of chip I R1150 is connected to the output voltage two ends by the dividing potential drop series resistance; FREQ pin and the ISNS pin of chip I R1150 pass through respectively grounding through resistance; The COM pin ground connection of chip I R1150, and be connected with the ISNS pin by electric capacity.
Described half-bridge inversion circuit comprises two field effect transistor, LC resonance; Two field effect transistor series connection, LC resonance is connected to one of them field effect transistor two ends, and the output of LC resonance is connected on the Non-polarized lamp.
After adopting such scheme, the utility model has been simplified the topological structure of ballast power factor correction and resonant circuit, only uses a power switch pipe, has proposed a kind of new electric ballast structure, can save power switch pipe number and control circuit like this, thereby simplify circuit.The utility model has reduced the intensity of electromagnetic interference; set up simultaneously the fault detection mechanism of Non-polarized lamp; when wearing out appears in Non-polarized lamp; show as the constant resistance R increase that fluorescent tube discharge ring plasma is mapped to ballast at circuit parameter; so in order to realize the aging protection of Non-polarized lamp; ageing state can be converted to overvoltage signal (rather than diode rectification effect), indirectly realize protection by overvoltage protection.
Description of drawings
Fig. 1 is the overall structure schematic diagram of the utility model preferred embodiment;
Fig. 2 is the APFC schematic diagram of the utility model preferred embodiment;
Fig. 3 is the half-bridge inversion circuit schematic diagram of the utility model preferred embodiment;
Fig. 4 is the permanent power control principle schematic diagram of the utility model preferred embodiment.
Embodiment
By reference to the accompanying drawings, preferred embodiment is described in further details to the utility model.
A kind of electronic ballast of electrodeless lamp as shown in Figure 1, comprises rectification unit 1, APFC 2, half-bridge inversion circuit 3.
In conjunction with Fig. 2, rectification circuit 1 comprises the bridge circuit that four diodes form, and its input connects electric main ACinput, and the output of rectification circuit 1 forms 385Voutput.
Rectification circuit the output voltage two ends be connected with APFC 2.APFC 2 adopts " monocycle control " control technology, and circuit mainly includes chip I R1150, some resistance, some electric capacity, field effect transistor as shown in Figure 2.Wherein the GATE pin of chip I R1150 connects the output voltage two ends by field effect transistor Q1.The external operating voltage vcc of VCC pin of chip I R1150, and by capacitor C 5 ground connection.The VFB pin of chip I R1150 is connected to the output voltage two ends by dividing potential drop series resistance R5, R6, R7.The COMP pin of chip I R1150 is by series resistance R4 and capacitor C 3 ground connection, and at the resistance R 4 of series connection and capacitor C 3 two ends a capacitor C 4 in parallel again.The OVP pin of chip I R1150 is connected to the output voltage two ends by dividing potential drop series resistance R8, R9, R10.The FREQ pin of chip I R1150 and ISNS pin are respectively by resistance R 1, R3 ground connection.The COM pin ground connection of chip I R1150, and be connected with the ISNS pin by capacitor C 2.
APFC 2 current loops utilize embedded input voltage signal to control average current input, allow it follow input voltage and change.The external voltage loop is being controlled the output voltage of boost converter, realizes the adjusting of power factor correction and output voltage.The design process of physical circuit is:
1, inductor design
Figure 943035DEST_PATH_IMAGE002
Power taking sensor current pulsation coefficient
Figure 2012203424948100002DEST_PATH_IMAGE004
Figure 2012203424948100002DEST_PATH_IMAGE006
=30, calculate through formula (1)
Figure 2012203424948100002DEST_PATH_IMAGE008
=1.45mH adopts PQ35/35 PCAO magnetic core and 0.Olmm
Figure 2012203424948100002DEST_PATH_IMAGE010
100 multi cords are got
Figure 2012203424948100002DEST_PATH_IMAGE012
2OO μ H, close around 85T.
2, input capacitance design
Figure 2012203424948100002DEST_PATH_IMAGE014
Maximum voltage ripple factor during high frequency (
Figure 2012203424948100002DEST_PATH_IMAGE016
), exemplary value is got r=6% in the design between 3% to 9%, calculated as can be known by formula (2), and the high frequency input capacitance is nominal value C=
Figure 2012203424948100002DEST_PATH_IMAGE018
, model is CBB21 film high frequency capacitance.
3, output capacitance design
Figure 2012203424948100002DEST_PATH_IMAGE020
Allow the output voltage ripple fluctuation in ± 3.5%, known by formula (3), output filter capacitor choice criteria numerical value is C6=
Figure 2012203424948100002DEST_PATH_IMAGE022
4, metal-oxide-semiconductor and fly-wheel diode
When MOSFET turn-offs, the anti-phase withstand voltage 400V that it bears, then
Figure 2012203424948100002DEST_PATH_IMAGE024
400V, when defeated people's voltage is minimum,
Figure 2012203424948100002DEST_PATH_IMAGE026
=2.44A.Selecting metal-oxide-semiconductor is the FQP11N50CF of fairchild company.Rectifier diode is when turn-offing, and the inverse peak voltage that bears is 400V, then VR〉400V, the electric current that flows through rectifying tube is
Figure 2012203424948100002DEST_PATH_IMAGE028
=0.57A, the fast recovery diode MUR360 of selection ON company.
5, control circuit design
The output voltage of transducer be by
Figure 2012203424948100002DEST_PATH_IMAGE030
,
Figure 2012203424948100002DEST_PATH_IMAGE032
With
Figure 2012203424948100002DEST_PATH_IMAGE034
The voltage divider that forms is set, and gets
Figure 234077DEST_PATH_IMAGE030
=
Figure 13814DEST_PATH_IMAGE032
=499k Ω, tolerance is 1%.Reference voltage Vf=7.0V then uses nominal value resistance =18.5k Ω/0.25W.
The factor of synthetic circuit electromagnetic interference performance, optimum inductor and power switch loss several respects, the selector switch frequency is 100kHz, at this moment R3=90k Ω.
Detect the resistance of electric current
Figure DEST_PATH_IMAGE038
Should be in the situation that input voltage be minimum, power output designs peak inrush current and load overload factor when power taking inducing current derate is used for maximum
Figure DEST_PATH_IMAGE040
=5%, then:
Calculate =0.55 Ω, power taking resistance nominal value
Figure 108175DEST_PATH_IMAGE038
=0.47 Ω, power are 2W.
In the system of peak current control, need to use external filter, now design the RC filter, its corner frequency design, is selected for the RC filter at about 1～1.5MHz
Figure DEST_PATH_IMAGE044
100 Ω,
Figure DEST_PATH_IMAGE046
The rated voltage of output capacitor is 450V, prevents that output voltage from exceeding the maximum rated voltage of output capacitor, and design output over-voltage protection (OVP) voltage divider is:
Figure DEST_PATH_IMAGE048
=
Figure DEST_PATH_IMAGE050
=499k Ω;
Figure DEST_PATH_IMAGE052
=17.9k Ω.
Half-bridge inversion circuit 3 inverter circuits adopt high pressure resonator L6598, and it is that first high voltage half-bridge driver with resonant transformation and 600V of the world is integrated into the control IC on the same chip.Can be used for the efficient power of AC/DC adapter, DC/DC module and the systems such as CTV and monitor with the resonance topology, can replace the half-bridge resonance device that was in the past formed by two chips, and price is very cheap.
The high-frequency electromagnetic energy that driver produces is coupled in the plasma of discharge by the power coupling coil, power coupling coil and discharging chamber can be considered the primary and secondary of a transformer, the simplified model of Non-polarized lamp comprises two field effect transistor S1, S2 as shown in Figure 3, and LC resonance; Two field effect transistor series connection S1, S2, LC resonance is connected to wherein field effect transistor S2 two ends, and the output of LC resonance is connected on the Non-polarized lamp, and in this circuit, Non-polarized lamp is by R EqAnd L EqExpression in parallel.
Can get according to Fig. 3:
Figure DEST_PATH_IMAGE054
,
Figure DEST_PATH_IMAGE056
Wherein, Be the fluorescent tube equivalent resistance;
Figure DEST_PATH_IMAGE060
Be a coupling coil inductance value (
Figure DEST_PATH_IMAGE062
),
Figure DEST_PATH_IMAGE064
For the coupling line number of turns ( =8T).
1, series resonance parameter designing
Can try to achieve according to Fig. 3, the Non-polarized lamp both end voltage is:
The power expression of knowing again lamp is:
Figure DEST_PATH_IMAGE068
The Non-polarized lamp operating voltage is 200 ~ 210V, and power is 200W, and operating frequency is 250kHz, =385V gets
Figure DEST_PATH_IMAGE072
≤
Figure 948010DEST_PATH_IMAGE060
, ,
Figure DEST_PATH_IMAGE076
, Be capacitance, get
Figure DEST_PATH_IMAGE080
2, igniting design and realization
During just start, L6598 is with maximum frequency operation, and its frequency reduces in the process, when this moment, fluorescent tube was not lighted,
Figure DEST_PATH_IMAGE082
∞, output voltage trends towards infinity, thereby with lamp tube starting.
The realization of permanent power control
The electric current that flows through fluorescent tube is:
Figure DEST_PATH_IMAGE084
The average current that then flows through power supply is:
Figure DEST_PATH_IMAGE086
The average voltage that flows through resistance R 1 is:
Figure DEST_PATH_IMAGE088
If ignore metal-oxide-semiconductor, inductance and capacity loss, the power that source of stable pressure provides is the power on the lamp, then:
Figure DEST_PATH_IMAGE090
，
Voltage on the resistance R is proportional to lamp power, gets 7 pin and connects reference voltage
Figure DEST_PATH_IMAGE092
, by inner amplifier 5, the pins such as 6,7, L6598 can realize closed-loop control, its block diagram is as shown in Figure 4.6 pin detect the electric current that lamp flows through, when 6 pin voltages are higher than
Figure DEST_PATH_IMAGE094
The time, 5 pin are output as low level, and 4 pin are flowed out in diode D conducting
Figure DEST_PATH_IMAGE096
Electric current strengthen 3 pin of L6598 Charging rate is accelerated, and namely the frequency of half-bridge drive circuit rises; Otherwise when 6 pin voltages are lower than The time, 7 pin output high level, 4 pin are flowed out in the D1 cut-off
Figure 547936DEST_PATH_IMAGE096
Electric current reduce 3 pin among Fig. 3
Figure 302265DEST_PATH_IMAGE098
, charging rate slows down, and frequency descends, thereby easily reverse frequency is modulated.So frequency raises, output voltage reduces, and vice versa, therefore can effectively realize permanent power control.
Above-described embodiment only is used for explaining inventive concept of the present utility model, but not to the restriction of the utility model rights protection, allly utilizes this design that the utility model is carried out the change of unsubstantiality, all should fall into protection range of the present utility model.

Claims (3)

1. an electronic ballast of electrodeless lamp is characterized in that: comprise rectification unit, APFC, half-bridge inversion circuit; Rectification circuit connects electric main, and the voltage after the rectification accesses in the APFC, and APFC connects half-bridge inversion circuit, finally is connected on the Non-polarized lamp.
2. a kind of electronic ballast of electrodeless lamp as claimed in claim 1 is characterized in that: described rectification unit is the bridge circuit that four diodes consist of, and its input termination electric main is connected with APFC on the output; APFC comprises chip I R1150, some resistance, some electric capacity, field effect transistor; Wherein the GATE pin of chip I R1150 connects the output voltage two ends by field effect transistor; The external operating voltage of VCC pin of chip I R1150, and pass through capacity earth; The VFB pin of chip I R1150 is connected to the output voltage two ends by the dividing potential drop series resistance; The COMP pin of chip I R1150 is by series resistance and capacity earth, and at the resistance of series connection and electric capacity two ends an electric capacity in parallel again; The OVP pin of chip I R1150 is connected to the output voltage two ends by the dividing potential drop series resistance; FREQ pin and the ISNS pin of chip I R1150 pass through respectively grounding through resistance; The COM pin ground connection of chip I R1150, and be connected with the ISNS pin by electric capacity.
3. a kind of electronic ballast of electrodeless lamp as claimed in claim 1, it is characterized in that: described half-bridge inversion circuit comprises two field effect transistor, LC resonance; Two field effect transistor series connection, LC resonance is connected to one of them field effect transistor two ends, and the output of LC resonance is connected on the Non-polarized lamp.
CN 201220342494 2012-07-16 2012-07-16 Electronic ballast for electrodeless lamp Expired - Fee Related CN202679767U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102752947A (en) * 2012-07-16 2012-10-24 绍兴文理学院 Electronic ballast of electrodeless lamp
CN108712812A (en) * 2018-06-04 2018-10-26 江阴万佳照明电器有限公司 A kind of electrodeless lamp power supply driving circuit and control method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102752947A (en) * 2012-07-16 2012-10-24 绍兴文理学院 Electronic ballast of electrodeless lamp
CN108712812A (en) * 2018-06-04 2018-10-26 江阴万佳照明电器有限公司 A kind of electrodeless lamp power supply driving circuit and control method
CN108712812B (en) * 2018-06-04 2024-02-06 江阴万佳照明电器有限公司 Electrodeless lamp power supply driving circuit and control method

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130116

Termination date: 20150716

EXPY Termination of patent right or utility model