《电源设计中减少待机功耗方法介绍》由会员分享，可在线阅读，更多相关《电源设计中减少待机功耗方法介绍（7页珍藏版）》请在金锄头文库上搜索。
1、Technical ReportPage 107/14/03ADVANCED ENGINEERING ASTEC POWERCHINAReducing Loss to Meet Standby RequirementMODEL: AA22360.Prepared by :DX ZHANGChecked by :Approved by :NameSignaturePRE- xx REVDATERemarkTechnical ReportPage 207/14/03ADVANCED ENGINEERING ASTEC POWERCHINAREF. No. : Dxx- xxx1. Backgrou
2、ndWe used the new IC NCP1200 instead of original control IC AS2000 in AA22360, The standby loss is out of requirement.2. Analysis In order to meet the requirement of input power less 1W when output 0.5W, We changed some components step by step and compare with above step to improve the loss.3. The O
3、riginal Test Data:Table 1. Input PowerPFCVin (DC) Po = 0.5W 300VDC300V7.72mA=2.316Wwith PFC 155VDC155V1.39mA=2.16W 300VDC300V6.09mA=1.828WPinWithout PFC155VDC155V1.15mA=1.78W NoteAll the power loss data test by power meter PM100Table 2. A c o u s t i c N o i s ePFC Description with PFC47W- 90W: high
4、 frequency(18k)NoiseWithout PFC0- 90W: high frequency(19k)4. Process of reduction loss in step by step (without PFC)4.1 Step 1Changing: NCP1200- ADJ connect 1k resiser to GND; without PFC; noP6KE150A; R4=R5=47.Test result:Table 3.Vin Po=0.5WTechnical ReportPage 307/14/03ADVANCED ENGINEERING ASTEC PO
5、WERCHINA155VDC155V1.03mA=1.604WPin300VDC300V6.17mA=1.852WComparison: Step 1 compared with the original that the input has 0.024W increasing at 300VDC input and has 0.176W improvement at 155VDC input. 4.2 Step 2:Changing: NCP1200- ADJ connect 1k resister to GND; without PFC;P6KE150A replaced R18; R4=
6、R5=47.Test result: Table 4.Vin Po=0.5W155VDC155V9.08mA=1.407WPin300VDC300V5.54mA=1.661WComparison: This step compared with step 1can reduce 0.191W at 300VDC input and has 0.197W improvement at 155VDC input.4.3 Step 3:Changing: NCP1200- ADJ connect 1k resistance to GND; without PFC;P6KE150A replaced
7、R18; R4=10; R5=12.Test result: Table 5.Vin Po=0.5W155VDC155V9.03mA=1.399WPin300VDC300V5.51mA=1.652WThis step compared with step 2 the input can reduce 0.009W at 300VDC input and can reduce 0.008W at 155VDC input.4.4 Step 4: Changing: NCP1200- ADJ connect 1k resister to GND; without PFC;Technical Rep
8、ortPage 407/14/03ADVANCED ENGINEERING ASTEC POWERCHINAP6KE150A replaced R18; R4=0; R5=12.Test result: Table 6.Vin Po=0.5W155VDC155V9.03mA=1.399WPin300VDC300V5.51mA=1.652WComparison: This step compared with step 3 the loss has no change.4.5 Step 5:Changing: NCP1200- Adj: NC; without PFC; P6KE150A rep
9、laced R18; R4=0;R5=12. Test result: Table 7.Vin Po=0.5W155VDC155V6.64mA=1.028WPin300VDC300V4.11mA=1.232WComparison: This step compared with step 4 the loss can reduce 0.42W at 300VDC input and can reduce 0.371W at 155V input.4.6 Step 6:Changing: NCP1200- Adj: NC; without PFC; P6KE150A replaced R18;
10、R4=10;R5=12. Test result: Table 8.Vin Po=0.5WPin 325VDC325V3.88mA=1.262WThis step compared with step 5 the loss has 0.03W increasing at 325VDC input.4.7 Step 7:Technical ReportPage 507/14/03ADVANCED ENGINEERING ASTEC POWERCHINAChanging: Under step 6 condition, between IC2- Pin3 and Pin4 to parallel
11、with a 100pF capacitor, it can eliminate noise from 0W to 90W output.Step 8:Changing: NCP1200- Adj: NC; without PFC; P6KE150A replaced R18; R4=10;R5=12; R115 from 6.8 reduced to 2.2. Test result: Table 9.Vin Po=0.5W155VDC155V6.65mA=1.03WPin325VDC325V3.85mA=1.251WComparison: This step compared with s
12、tep 5 the loss has 0.019W increasing at 325VDC and has 0.002W increasing at 155VDC.4.8 Step 9:This step used a new transformer which added a auxiliary winding of two turns in secondary. The auxiliary winding supply for LED1.Fig 1.Technical ReportPage 607/14/03ADVANCED ENGINEERING ASTEC POWERCHINACha
13、nging: NCP1200- Adj: NC; without PFC; P6KE150A replaced R18; R4=10;R5=12; R115=2.2. Test result: Table 10.Vin Po=0.5W155VDC155V5.43mA=0.842WPin325VDC325V3.26mA=1.059WComparison: This step compared with step 5 the loss can reduce 0.173W at 325VDC and has 0.186W improvement at 155VDC.4.9 Step 10:Based
14、 on step 9,The auxiliary winding in secondary supply for LED1and IC4- TL431.Fig 2.Condition: NCP1200- Adj: NC; without PFC; P6KE150A replaced R18;R4=10;R5=12; R115=2.2. Test result: Table 11.Technical ReportPage 707/14/03ADVANCED ENGINEERING ASTEC POWERCHINAVin Po=0.5W155VDC155V5.27mA=0.817WPin325VDC325V3.18mA=1.03WComparison: This step compared with step 9 the loss can reduce 0.025W at 155VDC and can reduce 0.029W at 325VDC.5. Conclusion: Step 10 compare with the original data, the input has been reduced 0.798W at 325VDC and 0.963W at 155VDC.So it can meet the requirement of standby.
