参数资料
| 型号： | IRPLCFL4 |
| 厂商： | International Rectifier |
| 文件页数： | 3/12页 |
| 文件大小： | 0K |
| 描述： | IC BALLAST DIMMING CFL 3-WAY |
| 标准包装： | 1 |
| 主要目的： | 照明，镇流器控制 |
| 已用 IC / 零件： | IR2156 |
| 已供物品： | 板，文档 |
| 相关产品： | IR2156SPBFDKR-ND - IC CONTROLLR BALLAST 600V 14SOIC IR2156SPBF-ND - IC CTRLR BALLAST 600V .5A 14SOIC IR2156SPBFCT-ND - IC CONTROLLR BALLAST 600V 14SOIC IR2156SPBFTR-ND - IC CONTROLLR BALLAST 600V 14SOIC IR2156PBF-ND - IC CONTROLLER BALLAST 600V 14DIP IR2156STR-ND - IC BALLAST CONT 600V .5A 14-SOIC IR2156-ND - IC CNTL BALLAST 600V 0.5A 14-DIP IR2156S-ND - IC CNTL BALLAST 600V 0.5A 14SOIC |
| 其它名称： | *IRPLCFL4 |
IRPLCFL4
This approach has some serious drawbacks:
Firstly, since the ballast must be designed to give 100% light output for the lamp when the bus voltage
is 300V and the frequency is 40kHz, it is not easy to achieve satisfactory preheat and ignition when
the bus voltage is at 150V because of the limitations in the peak voltage that the output circuit is able
to produce from a 150Vpp half bridge voltage.
One strategy that has been used is to omit the preheating phase and steer the oscillator frequency to
resonance during ignition using feedback from the output circuit. This ensures that at switch on the
highest possible ignition voltage will be applied to the lamp. In this way the lamp will ignite in whichever
position the 3 way switch is set.
Such a scheme could reliably ignite the lamp when the DC bus is at 300V, however without correct
preheating the ignition voltage of the lamp and consequently the peak current in the MOSFET half
bridge during ignition will be higher. Also the life of the lamp is substantially reduced when there is no
preheat due to far greater stress occurring on the cathodes at the point of ignition.
Ignition when the DC bus voltage is at 150V is very difficult. Tests indicated that sweeping the
frequency down through resonance failed to produce sufficient ignition voltage leaving the ballast in
open circuit running mode with inevitable hard switching at the half bridge. The conclusion from this
is that the ballast needs to oscillate at resonance for an extended period of time in order for the lamp
to ignite at 150V considering that the output inductor and capacitor have been designed to produce
100% lamp power at 300VDC bus when the frequency is 40-45kHz.
Many CFL ballast designs do not incorporate a current sense and shutdown function to protect the
circuit in the case of ignition failure and so the ballast would eventually fail if left switched on due to
the high MOSFET switching losses causing thermal destruction. This would not matter with and
integrated ballast / lamp type product when the lamp has failed.
It has also been observed that hard switching occurs at the MOSFET half bridge when the DC bus
voltage is low in position (1) since when the ballast is running it will be close to resonance, bearing in
mind that the resonant frequency shifts downwards in run mode. Hard switching is very undesirable
because of the high peak currents that occur when each MOSFET switches on. This has been shown
to result in a higher rate of field failures in ballasts due to MOSFET failure.
The conclusion is that the approach to design described above is unable to provide a reliable ballast.
Solution
A completely new approach has been developed that overcomes all of the above limitations based
around the popular and versatile IR2156 ballast control I.C.
www.irf.com
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相关PDF资料 |
PDF描述 |
|---|---|
| IRPLCFL5E | KIT DESIGN CFL BALLAST 220VAC |
| IRPLCFL5U | KIT DESIGN CFL BALLAST 120VAC |
| IRPLCFL8U | KIT DES FLUOR BALLAST IRS2530D |
| IRPLDIM1U | BALLAST DIMMING 32W/T8 120VAC |
| IRPLDIM2E | KIT BALLAST DIM DIG 230VAC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IRPLCFL5E | 功能描述:KIT DESIGN CFL BALLAST 220VAC RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 类型:MCU 适用于相关产品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口） 所含物品:面板、缆线、软件、数据表和用户手册 其它名称:520-1035 |
| IRPLCFL5U | 功能描述:KIT DESIGN CFL BALLAST 120VAC RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 类型:MCU 适用于相关产品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口） 所含物品:面板、缆线、软件、数据表和用户手册 其它名称:520-1035 |
| IRPLCFL7U | 制造商:International Rectifier 功能描述:9999V 999.000A OTHER - Boxed Product (Development Kits) |
| IRPLCFL8U | 功能描述:电源管理IC开发工具 3 lvl Dim CFL Fluor Ballast w/IRS2530D RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRPLCFL9U | 功能描述:电源管理IC开发工具 3 lvl Dim CFL Fluor Ballast Ref dsgn RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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