On Semi 180W LCD TV电源和逆变器方案

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On Semi 180W LCD TV电源和逆变器方案

作者：时间：2009-11-11 14:32 来源：

On Semi 公司的180W LCD TV电源和逆变器解决方案适用于输入电压从85-265 V ac, 47-63 Hz,具有功率因子修正,与IEC61000-3-2兼容,稳态功率50W,峰值可达60W,提供12V,5V和24V电压,逆变器具有100W功率,工作电压大于800Vac,固定频率逆变器可在40-80 kHz间调整.主要用于32” LCD-TV.本文介绍了参考设计的详细电路图和各部分电路图以及材料清单.

On Semi 180 W High Voltage LCD TV Power and Integrated Inverter Supply

This reference document describes a built-and-tested, GreenPointTM solution for and LCD-TV Integrated Power Supply (LIPS) that combines the main system power with the backlight inverter. In this architecture the inverter is directly powered from a high voltage rail (HV-LIPS) to improve the system power conversion efficiency and simplify the overall architecture by eliminating a power conversion stage. In this reference design, the inverter is configured to power 12 cold cathode fluorescent lamps (CCFL). All the circuitry is resident in on a single PCB as might be found in a 32” LCD-TV. This reference design circuit consists of a single-sided 175 mm x 330 mm printed circuit board designed to fit into the chassis of a LCD-TV. The height is 25 mm.
参考设计主要指标:
Critical Design Objectives
Input Voltage: Universal input 85-265 V ac, 47-63 Hz
系统电源:
Active Power Factor Corrected, IEC61000-3-2 Compliant
Maximum steady state power 50 W, 60 W Peak
12 V / 4 A Peak
5 V / 2.5 A Peak
24 V - MOSFET gate drive bias
Flexibility to be modified to support other voltage/current configurations
Standby Pin< 400 mW with 50 mW load (5 V at 10 mA)
逆变器电源:
100 W Capable
Strike voltage > 1500 V ac, Operating Voltage >800 V ac
Fixed frequency inverter adjustable between 40-80 kHz
Digital and Analog dimming capable
Capable of synchronization to video clock source

图1.参考设计整体方框图

图2.AC输入级

图3.PFC级

图4.反激转换器初级边

图5.反激转换器次级边

图6.反激改进,以增加待机频率

图7.反激转换器次级整流电路图,图中表明了配置灵活性

图8.+12 V 分离开关和线性稳压器

图9.+12V 次级稳压和安全电路

图10.LX6503电路图和控制信号

图11.全桥零电压开关驱动电路t

图12.电流和电压检测电路图

图13.平衡器配置和灯开路监视器

图14.用于U形灯的HV-LIPS 电流平衡

图15. HV-LIPS 绿点参考板 (SMPS1)(1)

图16. HV-LIPS 绿点参考板 (SMPS1)(2)

图17. HV-LIPS 绿点参考板 (SMPS1)(3)

图18. HV-LIPS 绿点参考板 (SMPS1)(4)

HV-LIPS板(SMPS1型)材料清单:

The following four pages contain the schematics for the complete PCB with all possible options (see Table 3) of the GreenPoint HV-LIPS design for details on the alternate configurations.