Electronic Ballast
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 17058Q TCP Electronic Ballast 13858B Lampholder 58W Circline CFL EC2CW 58 LPF $17.25 Time Remaining: 17d 15h 20m Buy It Now for only: $17.25 |
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 X Intense Pro Series Electronic Ballast HPS MH1000W New $12.84 (4 Bids) Time Remaining: 3d 14h 35m |
 Lot of 4 Sylvania 4 ft 4 light 120 Volt T8 Instant Start Electronic Ballasts $19.99 Time Remaining: 1d 12h 14m |
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 Techone 400W Street Lamp Cover and Electronic Ballast NEW $24.99 (1 Bid) Time Remaining: 11h 30m |
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 electronic ballast QHE3X32T8 ISL SC $50.00 (1 Bid) Time Remaining: 1d 15h 24m |
 VIVA SU13 13 watt Twist and Lock GU24 to G24q 1 4 Pin Socket Electronic Ballast $14.88 Time Remaining: 16d 22h 8m Buy It Now for only: $14.88 |
 Techone 400W Street Lamp Cover and Electronic Ballast NEW $24.99 Time Remaining: 1d 12h 27m |
 GE ULTRAMAX GE259MAX N ULTRA HIGH EFFICIENCY ELECTRONIC BALLAST $7.99 Time Remaining: 1d 19h 19m |
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 Techone 400W Street Lamp Cover and Electronic Ballast NEW $24.99 (1 Bid) Time Remaining: 3d 14h 30m |
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 LUTRON H3DT832CU210 Dimming Ballast Electronic 3D T8 2 Lamp $30.00 Time Remaining: 1d 15h 22m |
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 Philips F72 96 T8 Intellivolt Electronic Ballast Model IOP2P59SCI $15.00 Time Remaining: 2d 18h 37m |
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 UNIVERSAL TRIAD C242UNVME CF ELECTRONIC BALLAST 120 TO 277Vac $9.99 Time Remaining: 14h 45m |
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 Advance ICN 4P32 SC Instant Start Electronic Ballast lot of 5 $50.00 (1 Bid) Time Remaining: 2d 15h 37m |
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 4 GE Electronic Ballast GE 232MAX N Ultra 120 277 $45.00 Time Remaining: 3d 21h 9m |
 10 SYLVANIA QHE3X32T8 UNV ISL SC ELECTRONIC BALLAST T8 120 277 VOLT $69.95 Time Remaining: 5d 22h 5m Buy It Now for only: $69.95 |
 10 4 lamp T8 triad universal electronic ballasts $85.00 (1 Bid) Time Remaining: 3d 21h 14m |
 PHILIPS ADVANCE RAPID START ELECTRONIC BALLAST NEW IN PACKAGE $7.99 Time Remaining: 3d 19h 56m |
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 PHILIPS ADVANCE RAPID START ELECTRONIC BALLAST NEW IN PACKAGE $7.99 Time Remaining: 3d 19h 58m |
 PHILIPS ADVANCE RAPID START ELECTRONIC BALLAST NEW IN PACKAGE $7.99 Time Remaining: 3d 20h |
 Metrolight M39MH 1 LF CAM 39 Watt 120 V Electronic Ballast Metal Halide $24.99 Time Remaining: 29d 22h 41m Buy It Now for only: $24.99 |
 PHILIPS ADVANCE RAPID START ELECTRONIC BALLAST NEW IN PACKAGE $7.99 Time Remaining: 3d 20h 4m |
 PHILIPS ADVANCE RAPID START ELECTRONIC BALLAST NEW IN PACKAGE $7.99 Time Remaining: 3d 20h 7m |
 MTI Microballast MB 232 WV RS T8NC WorldVoltage Electronic Ballast for 2 F32T8 $8.99 Time Remaining: 27d 20h 24m Buy It Now for only: $8.99 |
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 10 TRIAD B232IUNVHP B 2 LAMP ELECTRONIC BALLAST $85.00 Time Remaining: 3d 21h 13m |
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 10 TRIAD B332IUNVHP A 3 LAMP ELECTRONIC BALLAST $85.00 Time Remaining: 3d 21h 13m |
 PHILIPS ADVANCE RAPID START ELECTRONIC BALLAST NEW IN PACKAGE $7.99 Time Remaining: 3d 42m |
 FT40W 2G11 2 T5 Lamp Universal Electronic Ballast $7.20 Time Remaining: 17d 17h 14m Buy It Now for only: $7.20 |
 Universal Triad B132IUNVEL A010C 120 277 volt electronic ballasts Case of 10 $44.95 Time Remaining: 4d 21h 22m |
 Fulham Workhorse 7 Fluorescent Solid State Electronic Ballast 120V WH7 120 L $4.95 Time Remaining: 5d 21h 46m |
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 Hatch FR 2600 electronic flurorescent ballast lamp NEW 26 watt $8.50 Time Remaining: 5d 13h 17m |
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 Hatch MC70 1 F 120U 120V 70 Watt Electronic Metal Halide Ballast NEW $0.99 Time Remaining: 4d 21h 8m |
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 Techone 400W Street Lamp Cover and Electronic Ballast NEW $24.99 Time Remaining: 6d 10h 36m |
 277V 4 bulb Electronic Ballast F32 T8 4x $15.99 Time Remaining: 2d 22h 23m |
Electronic Ballast
Variable impedance electronic ballast for a gas discharge device
This invention relates to an electronic ballast for driving a set of gas discharge lamps which is capable of driving the lamps independently of lamp loading, i.e., with less than all of the lamps in the set connected or operating, and in a transition period during which a lamp already connected stops or starts operating, or a during which a lamp is changed. Electronic ballasts may include a resonant inverter which is current-fed or voltage-fed. The invention herein relates to an electronic ballast with a voltage-fed resonant inverter.
Electronic ballasts that drive a set of gas discharge lamps should regulate the output to the lamps to drive the lamps with all, or less than all, of the lamps in the set operating or connected. Thus, if a lamp either degrades, stops lighting altogether or is disconnected, the ballast should continue to provide a satisfactory output to the remaining operating lamps. The same applies in a transition period during which a lamp already connected stops or starts operating and when a lamp is changed. It is highly desirable for a ballast to continue operating the remaining lamps connected thereto during a lamp change and to ignite a newly connected lamp so that it is not necessary to turn the power off to the ballast during lamp changing or to restart all of the lamps after a lamp change. Thus, electronic ballasts for multiple lamp operation advantageously should operate all connected lamps independently of lamp loading as indicated above. Such ballasts advantageously should also permit instant and/or rapid start operation.
An electronic ballast with a current-fed inverter requires a large, heavy inductor in series with the input of the inverter. Such ballasts are less affected by lamp loading due largely to the presence of the large input inductor, and are capable of multiple lamp operation independently of lamp loading, However, the large input inductor required by current-fed inverters increases the cost and the size and weight of the ballast.
U.S. Pat. No. 5,438,243 discloses an electronic ballast for multiple independent lamp operation of instant start gas discharge lamps, which includes a quasi-voltage-fed half-bridge parallel resonant inverter, as shown in FIG. 2 of the patent. Intrinsically, the electronic ballast operates in current-fed parallel resonant mode where the current source is derived from an ideal voltage source in series with a first resonant tank circuit. In order to maintain a high voltage output for lamp starting, which requires a high Q, a second resonant circuit is provided. The electronic ballast circuit disclosed in this patent thus contains two cascaded resonant tanks. As a result, circuit losses and cost are increased. At the output, two ballast inductors are provided in series with two lamps and two ballast capacitors are provided in series with two other lamps, which reduces the reactive power requirement on the secondary side of the output transformer. However, this electronic ballast may impose a high voltage hazard across the output terminals when the lamps are removed while the circuit is hot. Other types of electronic ballast circuits with current-fed push-pull or half-bridge inverters for multiple florescent lamps are described at pages 583 and 584 of Power Semiconductor Applications Handbook 1995, Philips Semiconductor, 1994. In those configurations, each lamp is parallel connected to the output of a resonant inverter via a series ballast capacitor. The current source is usually obtained via a choke inductor in series with a voltage source. Good independent lamp operation is achieved via a constant relation between the output high frequency voltage and the input DC voltage. The disadvantages of this type of circuit include higher switch stresses and the added bulky choke inductor.
On the other hand, an electronic ballast with a voltage-fed resonant inverter, including well known half-bridge LC or LLC resonant inverters, do not require a large input inductor but are affected more by lamp loading, and thus require additional circuitry or resonant components in order to achieve multiple lamp independent operation.
U.S. Pat. Nos. 5,438,243, 5,394,064, 5,075,599 and 4,535,399 disclose electronic ballasts for multiple lamp independent operation which include voltage fed inverters. The electronic ballast described in U.S. Pat. No. 5,394,064, which permits dimming operation, includes a voltage-fed half-bridge resonant inverter which generates a high frequency square-wave voltage. Control is provided by varying the input voltage to the inverter or the inverter frequency, or both using voltage feedback from the input to the inverter and feedback from the lamp circuit to the oscillator driving the inverter switches. As shown in FIG. 1 of the patent, a transformer couples the lamps to the inverter, with each lamp being driven through an individual resonant tank circuit consisting of a series inductor and a parallel capacitor. The circuit for connecting the lamps may be considered as a parallel connection of multiple resonant tanks each loaded with a single lamp. Although multiple lamp operation is achieved, a large number of magnetic components and capacitors is required, which results in higher cost.
The electronic ballast described in U.S. Pat. No. 4,535,399 includes a voltage-fed resonant inverter and a separate resonant tank circuit for each lamp (FIG. 6). Each of the separate resonant tank circuits includes a small inductor and a capacitor, which adds to the cost of the ballast. This ballast also includes a current feedback loop which controls switching of a pulse width modulator ("PWM") that supplies the timing for driving the inverter. The current feedback loop includes a phase locked loop ("PLL") which provides a DC output to the PWM proportional to the change in phase of the current sensed at the output of the inverter. The PLL forces the inverter to operate at a frequency where the modulating pulses are initiated at the load current zero crossing. The PLL includes a low pass filter (FIG. 2) and has a suitable low frequency response which allows the PLL to maintain tracking during steady state operation. However, the PLL has a poor high frequency response which prevents the PLL from tracking fast transients that are produced, for example, when a lamp is disconnected or connected. As a result, the PLL may cease tracking, i.e., become unlocked during a lamp change, which can cause loss of zero voltage switching and destruction of the inverter.
U.S. Pat. Nos. 5,075,599 and 4,277,728 both disclose electronic ballasts for driving a single gas discharge lamp with a phase related feedback loop for control. In the '599 patent, correction towards a target phase angle difference (e.g., 0) is made when a minimum reference phase angle difference is greater than the measured phase angle difference (FIG. 5). If the measured phase angle difference is greater than reference phase angle difference, then no correction is made. In the '728 patent, a phase detector (FIGS. 4a and 4b) senses the phase difference between the input to the inverter (push-pull in FIG. 4a and half-bridge in FIG. 4b) and the voltage across the load. For proper operation, the phase difference should be 90 degrees, indicating that the inverter is operating at the resonant frequency. If the phase difference is not 90 degrees, the phase detector provides an error signal causing the inverter to change frequency towards the resonant frequency. The electronic ballast disclosed in the '728 patent also includes an inductor in the resonant circuit which limits current to the load.
About the Author
Ningbo Zhengjia Electric Appliance Co., Ltd is a professional R & D manufacturer and exporter of electronic ballast for fluorescent lamps(FL) and Compact Fluorescent Lamps(PL).
what is the difference between electronic ballast and electronic ballast for uv lamp?
There is no different in the ballast proper. A UV lamp (of a size) is just a standard fluorescent lamp electrically, with different phosphor, no phosphor, and/or different glass.
digital ballasts VS magnetic ballasts, hydroponics secrets 48