CN201674717U - Segmented light adjustment double-tube electronic ballast - Google Patents
Segmented light adjustment double-tube electronic ballast Download PDFInfo
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- CN201674717U CN201674717U CN2010201836658U CN201020183665U CN201674717U CN 201674717 U CN201674717 U CN 201674717U CN 2010201836658 U CN2010201836658 U CN 2010201836658U CN 201020183665 U CN201020183665 U CN 201020183665U CN 201674717 U CN201674717 U CN 201674717U
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- circuit
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- inductance
- electronic ballast
- bridge inverter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The utility model discloses a segmented light adjustment double-tube electronic ballast which controls connection and disconnection of a bidirectional triode thyristor which is parallelly connected with an additional resonant inductance coil serially connected in a half-bridge inverter serial resonant tank, and changes the resonant frequency for segmented light adjustment. When the intensity level of tubes is switched from normal intensity to lower intensity, a light adjusting adaptor circuit outputs a low-level signal to stop oscillation of the half-bridge inverter, therefore, the bidirectional triode thyristor can be smoothly disconnected. When in a lower intensity level state, additional heating power is automatically supplied for the two filaments between the two tubes which are connected in series so as to prolong the service life of the tubes. Two tube abnormal state protection sampling signal circuits are arranged, thus being capable of protecting the tubes reliably when any tube is abnormal at any intensity level.
Description
Technical field
The utility model relates to a kind of illumination electronic amperite of gas-discharge lamp, particularly a kind of sectional dimming electronic ballast with double lamp tubes.
Background technology
Adopt low pressure such as the fluorescent lamp of electric ballast and metal halide lamp or high-voltage gas discharging light to obtain promotion and application increasingly extensively.
Utilize high pressure that the series resonance of choke and lamp electric capacity produces with the lamp activating conducting, limit the semi-bridge inversion formula electric ballast of operating current afterwards by choke, have simple in structure, the efficient height, components and parts are required series of advantages such as relatively low, be to use very general a kind of electric ballast.
For energy-conservation and comfortable illumination, the requirement of as required brightness being adjusted has been proposed further.Brightness can continuously change is called continuous light tuning; The brightness classification changes is called sectional dimming.
Carry out light modulation for fluorescence lamp ﹠ lantern gaseous discharge lamp, just can change luminosity unlike incandescent lamp quasi-resistance electrical equipment as long as change the AC supply voltage value that applies simply, other performances of particularly also wanting to take into account ballast in light modulation meet various requirement.
At present, the light-dimming method that fluorescence lamp ﹠ lantern electronic amperite of gas-discharge lamp adopted has methods such as the frequency of regulating the inversion pumping signal, pulse duration, impulse phase.The characteristics of these class methods are dimming scope broads, but complex structure, and cost is higher.Light-dimming method mainly is to carry out light modulation with the supply power voltage that controllable silicon changes inverter cheaply, but this class methods dimming scope is narrow, and is bigger to electric network influencing.
By changing the inductance value of half-bridge inverter series resonance tank circuit resonant inductance, can directly change lamp current, thereby change the luminosity of fluorescent tube.This method can be controlled the luminosity of fluorescent tube more conveniently, and keeps inverter operate as normal in allowed band all the time.But, because resonant inductance is a device that is operated under high frequency, the big current condition, changes its inductance value with the method for electronics and need overcome many technological difficulties, only be used in usually can with hand switch control as occasions such as desk lamp and standard lamps.
The utility model content
Technical problem to be solved in the utility model is will provide a kind of to control the conducting of bidirectional triode thyristor and end the inductance value that changes the series resonance choke, realizes the sectional dimming electronic ballast with double lamp tubes of two sections controls of lighting tube brightness.When fluorescent tube is in the low-light level state filament supplementary heating power; Be under the different intensity level states at fluorescent tube and can both carry out the abnormal condition of lamp tube state protection effectively; And after dimming control switch and switch state circuit, be provided with special-purpose sectional dimming adapter circuit, corresponding instantaneous in dimming control switch from " closure " to " disconnection " or the switching of the state from " disconnection " to " closure ", produce the two-way control wave, bidirectional triode thyristor is changed on request in conducting and by between two states.
In order to solve above technical problem, the utility model provides a kind of sectional dimming electronic ballast with double lamp tubes, comprise the AC and DC translation circuit, half-bridge inverter switching circuit and exciting circuit thereof, the half-bridge inverter switching circuit serial connection LC series resonance tank circuit, two fluorescent tube series connection, the value of inductance L is subjected to adjusting control circuit control and reduces or increase the regulation and control of realization lighting tube brightness in the series resonance tank circuit.
Power supply phase line L and power supply center line N power to electric ballast through mains switch S.In the ac/dc translation circuit, behind electromagnetic compatibility filter circuit, AC rectification filter circuit, power factor correction circuit and DC filtering circuit, provide dc high voltage to half-bridge inverter switching tube Q1 and Q2.The switching tube exciting circuit provides high frequency pumping voltage for half-bridge inverter switching tube Q1 and Q2.
Inductance L is made up of inductance L 1, L2 in the described series resonance tank circuit, before lamp lighting-up, form the series resonance tank circuit with resonant capacitance C1, the high voltage at resonant capacitance C1 two ends is lighted lamp activating during resonance, after fluorescent tube is activated and lights, the modulating voltage decision of the current potential at resonant capacitance C1 two ends during by lamp works, at this moment, it is constant on setting to keep lamp current by the induction reactance of resonant inductance coil; As long as change the inductance value of resonant inductance, just can change the size of lamp current.Inductance L 2 two ends also connect a two-way controllable silicon, and bidirectional triode thyristor is connected with adjusting control circuit.
Described adjusting control circuit comprises dimming control switch, switch state circuit and light modulation adapter circuit; Wherein, dimming control switch is the electronic switch of any mechanical switch or photo-electric control; The switch state circuit is with closure/disconnection two states, is converted to the digital signal of direct current low level " 0 "/" 1 ".
Described light modulation adapter circuit comprises driver, voltage comparator, waveform shaping circuit and output driver; Driver carries out low level " 0 "/" 1 " signal of input to divide two-way output after impedance and the reversal, one the tunnel to be connected with the bidirectional triode thyristor control utmost point behind the waveform shaping circuit, switch state signal in input transfers the instantaneous of " 0 " to by " 1 ", the a-signal of output cathode, deliver to the control utmost point G of bidirectional triode thyristor BCR, make bidirectional triode thyristor BCR conducting, and with the elementary winding n of inductance coil L2
1Short circuit, the total inductance amount of the series resonance tank circuit reduces, and just flows through bigger electric current in the fluorescent tube, and ballast makes lamp works at the higher normal brightness state of frequency; Another road is through voltage comparator, shaping circuit and output driver, be connected with the switching tube base stage of half-bridge inverter switching circuit, switch state signal in input transfers the instantaneous of " 1 " to by " 0 ", negative sense low level signal B that width is a few tens of milliseconds of base stage output to half-bridge inverter switching tube Q2, make the of short duration failure of oscillation of half-bridge inverter, during the half-bridge inverter failure of oscillation, bidirectional triode thyristor BCR does not transfer cut-off state because of there being enough electric currents of keeping to from conducting, the elementary winding n of inductance coil L2
1Inductance do not become the part of series resonance tank circuit total inductance amount because of bidirectional triode thyristor BCR short circuit, the increase of serial connection resonant groove path total inductance amount causes flowing through lamp tube current and reduces, the ballast operating frequency reduces, and fluorescent tube just is operated on the lower intensity level.
Series resonance tank circuit inductance coil L2 secondary winding n is arranged respectively
2And n
3, winding n
2Be serially connected in the filament loop of two serially connected lamp tubes, also be serially connected with current limiting capacitance C in this filament loop
3Winding n
3Be connected with the abnormal condition of lamp tube state protection circuit.
Series resonance tank circuit inductance L 1 secondary winding n is arranged
2Be connected with the abnormal condition of lamp tube state protection circuit.
When two fluorescent tube tandem workings, two filaments of the interconnective centre of fluorescent tube are when fluorescent tube is in the half-power brightness levels state of electric current reduction, by second the secondary winding n of the inductance coil L2 in the work
3Supplementary heating power is provided, adjusts second secondary winding n of inductance coil L2
3The number of turn and the capacity of current limiting capacitance C3, the electric current of two filaments of electric current and two ends of two filaments keeps approaching consistent numerical value in the middle of making.
Any one occur to disconnect in two fluorescent tubes, and loose contact does not activate and life-span when being about to abnormality such as terminations, and abnormal condition of lamp tube is protected the secondary winding n of sample circuit from resonant inductance L1
2Perhaps from the secondary winding n of resonant inductance L2
2Obtain the information that abnormality appears in fluorescent tube, form control signal, be added to the base stage of half-bridge inverter switching tube Q2, make the half-bridge inverter failure of oscillations, thereby the protection ballast is not damaged or causes the generation of other dangerous phenomenons.
When fluorescent tube was in the high full power operation state of brightness and is in the lower half-power state of brightness, the size of abnormal condition of lamp tube status signal was different.For this reason, be provided with the circuit that obtains the abnormal condition of lamp tube status signal from inductance coil L1 and inductance coil L2 two covers.During total power brightness, by the secondary winding n of inductance coil L1
2Obtain the abnormal condition of lamp tube status signal, this moment, inductance coil L2 was by bidirectional triode thyristor BCR short circuit, its secondary winding n
2Do not have output signal, abnormal condition of lamp tube state sample circuit is from the secondary winding n of inductance coil L1
2The abnormal condition of lamp tube status signal that obtains; During half-power brightness, because the inductance value of inductance coil L2 is much larger than the inductance value of inductance coil L1, from the secondary winding n of inductance coil L2
2The abnormal condition of lamp tube status signal that obtains is also than the secondary winding n from inductance coil L1
2It is big that the abnormal condition of lamp tube status signal that obtains is wanted, and the abnormal condition protection of fluorescent tube when the half-power intensity level depends on the secondary winding n from inductance coil L2
2The abnormality signal that obtains.
Superior effect of the present utility model is:
1) bidirectional triode thyristor switches the control method of the inductance value of resonant inductance, can use on the electric ballast of large and small different capacity output;
2) ballast is a power output when adjusting fluorescent tube being done high and low brightness, and fluorescent tube can both prolong lamp tube service life reasonably working under the state;
3) not to be subjected to lighting tube brightness be the influence of power output for the power factor of ballast and current harmonics distortion, can meet the requirement of various standards to ballast power factor and current harmonics distortion, have simple in structure, the remarkable advantage that cost performance is high.
Description of drawings
Fig. 1 is a circuit diagram of the present utility model;
Fig. 2 is a sectional dimming adapter circuit input and output oscillogram of the present utility model;
The number in the figure explanation
L-power supply phase line; Lp1-gaseous discharge lamp 1;
N-power supply center line; Lp2-gaseous discharge lamp 2;
S-ballast power switch; L1-resonant inductance coil 1;
1-ac/dc translation circuit; L2-resonant inductance coil 2;
2-switching tube drive circuit; n
1The elementary winding of-resonant inductance coil;
The 3-dimming control switch; n
2-resonant inductance coil secondary winding;
4-switch state circuit; n
3-inductance coil L2 second subprime winding;
5-sectional dimming adapter circuit; The C1-resonant capacitance;
The sampling of 6-abnormal condition of lamp tube state protection; The C2-partiting dc capacitor;
The 7-driver; The C3-current limiting capacitance;
The 8-voltage comparator; The R1-starting resistance;
The 9-waveform shaping; A-light modulation adapter circuit output signal;
10-exports driving; B-light modulation adapter circuit output signal;
The 11-waveform shaping; C-half-bridge inverter switching tube mid point;
Q1, Q2-half-bridge inverter switching tube; D-abnormal condition of lamp tube status signal;
The BCR-bidirectional triode thyristor; I-light modulation adapter circuit input signal.
Embodiment
The utility model will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, the utility model provides a kind of sectional dimming electronic ballast with double lamp tubes, comprise AC and DC translation circuit 1, half-bridge inverter switching circuit and exciting circuit thereof, the half-bridge inverter switching circuit serial connection LC series resonance tank circuit, two fluorescent tube series connection, the value of inductance L is subjected to adjusting control circuit control and reduces or increase the regulation and control of realization lighting tube brightness in the series resonance tank circuit.
Power supply phase line L and power supply center line N power to electric ballast through mains switch S.In ac/dc translation circuit 1, behind electromagnetic compatibility filter circuit, AC rectification filter circuit, power factor correction circuit and DC filtering circuit, the dc high voltage of output is received the collector electrode of half-bridge inverter switching tube Q1, the emitter of switching tube Q1 is connected with the collector electrode of switching tube Q2, the grounded emitter of switching tube Q2 constitutes the half-bridge inverter circuit.The switching tube exciting circuit 2 that is connected on half-bridge inverter switching tube Q1 base stage and switching tube Q2 base stage provides high frequency pumping voltage for half-bridge inverter.On the mid point C of half-bridge inverter switching tube, connect the series resonance tank circuit of half-bridge inverter, this series resonance tank circuit is by the elementary winding n of the resonant inductance coil L1 that connects successively
1, with the resonant capacitance C1 that the first fluorescent tube Lp1 that is connected in series and the second fluorescent tube Lp2 are in parallel, partiting dc capacitor C2, the elementary winding n of the resonant inductance coil L2 that is connected in parallel with bidirectional triode thyristor BCR
1Form.
Inductance L is made up of inductance L 1, L2 in the described series resonance tank circuit, before lamp lighting-up, form the series resonance tank circuit with resonant capacitance C1, the high voltage at resonant capacitance C1 two ends is lighted lamp activating during resonance, after fluorescent tube is activated and lights, the modulating voltage decision of the current potential at resonant capacitance C1 two ends during by lamp works, at this moment, it is constant on setting to keep lamp current by the induction reactance of resonant inductance coil; As long as change the inductance value of resonant inductance, just can change the size of lamp current.Inductance L 2 two ends also connect a two-way controllable silicon, and bidirectional triode thyristor is connected with adjusting control circuit.
Described adjusting control circuit comprises dimming control switch 3, switch state circuit 4 and light modulation adapter circuit 5; Wherein, dimming control switch 3 is electronic switches of any mechanical switch or photo-electric control; Switch state circuit 4 is with closure/disconnection two states, is converted to the digital signal of direct current low level " 0 "/" 1 ".
Described light modulation adapter circuit 5 comprises driver 7, voltage comparator 8, waveform shaping circuit 9 and output driver 10 and waveform shaping circuit 11; Driver 7 carries out low level " 0 "/" 1 " signal of input to divide two-way output after impedance and the reversal, one the tunnel controls utmost point G with waveform shaping circuit 11 backs with bidirectional triode thyristor BCR is connected, switch state signal I in input transfers the instantaneous of " 0 " to by " 1 ", the a-signal of output cathode, deliver to the control utmost point G of bidirectional triode thyristor BCR, make bidirectional triode thyristor BCR conducting, and with the elementary winding n of inductance coil L2
1Short circuit, the total inductance amount of the series resonance tank circuit reduces, and just flows through bigger electric current in the fluorescent tube, and ballast makes lamp works at the higher normal brightness state of frequency.
In order to eliminate the noise jamming on the input signal, obtain stablizing square wave output, another road signal of driver 7 described in the described sectional dimming adapter circuit 5 is through voltage comparator 8, shaping circuit 9 and output driver 10, be connected with the switching tube Q2 base stage of half-bridge inverter switching circuit, switch state signal I in input transfers the instantaneous of " 1 " to by " 0 ", negative sense low level signal B that width is a few tens of milliseconds of base stage output to half-bridge inverter switching tube Q2, make the of short duration failure of oscillation of half-bridge inverter, during the half-bridge inverter failure of oscillation, bidirectional triode thyristor BCR does not transfer cut-off state because of there being enough electric currents of keeping to from conducting, the elementary winding n of inductance coil L2
1Inductance do not become the part of series resonance tank circuit total inductance amount because of bidirectional triode thyristor BCR short circuit, the increase of serial connection resonant groove path total inductance amount causes flowing through lamp tube current and reduces, the ballast operating frequency reduces, and fluorescent tube just is operated on the lower intensity level.The dimming control switch state input signal I of the above sectional dimming adapter circuit 5, the waveform schematic diagram of output control signal A and B as shown in Figure 2.
Series resonance tank circuit inductance coil L2 secondary winding n is arranged respectively
2And n
3, winding n
2Be serially connected in the filament loop of two serially connected lamp tubes, also be serially connected with current limiting capacitance C in this filament loop
3Winding n
3Be connected with the abnormal condition of lamp tube state protection circuit.
Series resonance tank circuit inductance L 1 secondary winding n is arranged
2Be connected with the abnormal condition of lamp tube state protection circuit.
The starting resistance R1 that is connected on described ac/dc translation circuit 1 output and is on the described switching tube Q1 collector electrode high direct voltage provides initial starting oscillation current when half-bridge inverter is started working.
The described first fluorescent tube Lp1 and the second fluorescent tube LP2 are connected in series, and one in two middle filament legs is connected to each other together, another pin by current limiting capacitance C3 respectively with another secondary winding n of described resonant inductance coil L2
3Pin 5 be connected with 6.Than the brightness levels state time, the reducing of lamp current may cause two filament underheats in the middle of two serially connected lamp tubes in lamp works.This secondary winding n of utilization just in time in running order described resonant inductance coil L2 under low-light level
3Provide additional filament heating power to fluorescent tube.Adjust the pin 5 of inductance coil L2 and 6 secondary winding n
3The number of turn and the capacity of filament capacitance C3, the electric current of two filaments of electric current and two ends of two filaments keeps approaching consistent numerical value in the middle of making.
Secondary winding n from described resonant inductance coil L1 and L2
2Pin 3 and 4 obtain the sampled signal of abnormal condition of lamp tube state protection, they are all received described abnormal condition of lamp tube state protection sample circuit 6.When fluorescent tube is in total power brightness, from the pin 3 of described inductance coil L1 and 4 secondary winding n
2Obtain the abnormal condition of lamp tube status signal; During half-power brightness, because the inductance value of described inductance coil L2 is much larger than the inductance value of described inductance coil L1, the abnormal condition of lamp tube status signal obtains from the pin 3 of inductance coil L2 and 4 secondary winding n2.Described abnormal condition of lamp tube state protection sample circuit 6 output protection signal D when the abnormal condition of lamp tube state appears in fluorescent tube.Abnormal condition of lamp tube state protection signal D also receives the base stage of described half-bridge inverter switching tube Q2; no matter ballast makes fluorescent tube be in which kind of intensity level; any one in two fluorescent tubes occurs disconnecting; loose contact; do not activate and life-span when being about to abnormality such as termination, all can produce the abnormal condition of lamp tube guard signal D that makes the half-bridge inverter failure of oscillation.
Claims (6)
1. a sectional dimming electronic ballast with double lamp tubes comprises the AC and DC translation circuit, and half-bridge inverter switching circuit and exciting circuit thereof is characterized in that:
The half-bridge inverter switching circuit serial connection LC series resonance tank circuit, two fluorescent tube series connection, the value of inductance L is subjected to adjusting control circuit control and minimizing or increase in the series resonance tank circuit, realizes the lighting tube brightness regulation and control.
2. by the described sectional dimming electronic ballast with double lamp tubes of claim 1, it is characterized in that:
Inductance L is made up of inductance L 1, L2 in the described series resonance tank circuit, and inductance L 2 two ends also connect a two-way controllable silicon, and bidirectional triode thyristor is connected with adjusting control circuit.
3. by claim 1 or 2 described sectional dimming electronic ballast with double lamp tubes, it is characterized in that:
Described adjusting control circuit comprises dimming control switch, switch state circuit and light modulation adapter circuit; Wherein, dimming control switch is any mechanical switch or electronic switch; The switch state circuit is with closure/disconnection two states, is converted to the digital signal of direct current low level " 0 "/" 1 ".
4. by the described sectional dimming electronic ballast with double lamp tubes of claim 3, it is characterized in that:
Described light modulation adapter circuit comprises driver, voltage comparator, waveform shaping circuit and output driver; Driver carries out low level " 0 "/" 1 " signal of input to divide two-way output after impedance and the reversal, and one the tunnel to be connected with the bidirectional triode thyristor control utmost point behind the waveform shaping circuit; Another road is connected with the switching tube base stage of half-bridge inverter switching circuit through voltage comparator, shaping circuit and output driver.
5. by claim 1 or 2 described sectional dimming electronic ballast with double lamp tubes, it is characterized in that:
Series resonance tank circuit inductance coil L2 secondary winding n is arranged respectively
2And n
3, winding n
2Be serially connected in the filament loop of two serially connected lamp tubes, also be serially connected with current limiting capacitance C in this filament loop
3Winding n
3Be connected with the abnormal condition of lamp tube state protection circuit.
6. by the described sectional dimming electronic ballast with double lamp tubes of claim 1, it is characterized in that:
Series resonance tank circuit inductance L 1 secondary winding n is arranged
2Be connected with the abnormal condition of lamp tube state protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201836658U CN201674717U (en) | 2010-05-05 | 2010-05-05 | Segmented light adjustment double-tube electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201836658U CN201674717U (en) | 2010-05-05 | 2010-05-05 | Segmented light adjustment double-tube electronic ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201674717U true CN201674717U (en) | 2010-12-15 |
Family
ID=43332123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201836658U Expired - Lifetime CN201674717U (en) | 2010-05-05 | 2010-05-05 | Segmented light adjustment double-tube electronic ballast |
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|---|---|
| CN (1) | CN201674717U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101835326A (en) * | 2010-05-05 | 2010-09-15 | 上海阿卡得电子有限公司 | Sectional dimming electronic ballast with double lamp tubes |
| CN102281693A (en) * | 2011-05-16 | 2011-12-14 | 上海阿卡得电子有限公司 | Auto-start control circuit of gas discharge lamp tube |
| CN106028560A (en) * | 2016-07-14 | 2016-10-12 | 重庆美景光电科技有限公司 | LCM test fixture backlight isolation driving circuit and communication module thereof |
-
2010
- 2010-05-05 CN CN2010201836658U patent/CN201674717U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101835326A (en) * | 2010-05-05 | 2010-09-15 | 上海阿卡得电子有限公司 | Sectional dimming electronic ballast with double lamp tubes |
| CN101835326B (en) * | 2010-05-05 | 2012-10-10 | 上海阿卡得电子有限公司 | Sectional dimming electronic ballast with double lamp tubes |
| CN102281693A (en) * | 2011-05-16 | 2011-12-14 | 上海阿卡得电子有限公司 | Auto-start control circuit of gas discharge lamp tube |
| CN106028560A (en) * | 2016-07-14 | 2016-10-12 | 重庆美景光电科技有限公司 | LCM test fixture backlight isolation driving circuit and communication module thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101215 |
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| CX01 | Expiry of patent term |