請教各位DX．單端反激開關變壓器參數搞不懂啊(芯片是L6561)!
各位DX及七年老師:L6561Z在單端反激開關變壓器的參數幾個見圖中間所標示的是怎樣換算出來的啊!
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1. Design Specifications:
- Mains voltage range: VACmin = 88 Vac, VACmax = 264 Vac
- Minimum mains frequency: fL = 50 Hz
- DC Output Voltage: Vout = 15 V
- Maximum output current: Iout = 2A
- Maximum 2fL output ripple: DVo = 1V peak-to-peak
2. Pre-design Choices:
- Minimum switching frequency: fswmin = 25 kHz
- Reflected voltage: VR = 100V ??此反射電壓怎么來的啊
- Leakage inductance overvoltage: DV =70V
- Expected efficiency: h = 85%
3. Preliminary Calculations:
AN1059 APPLICATION NOTE
- Maximum Input Peak Voltage: VPKmin = VACmin × ?``2 = 264 × ?``2 = 373V
- Maximum Output Power: Pout = Vout × Iout = 15 × 2 = 30W
- Maximum Input Power: Pin =
Pout
h
× 100 =
30
85
× 100 = 35.3W
- Peak-to-reflected Voltage Ratio: Kv =
VPKmin
VR
=
120
100
= 1.2
- Characteristic functions value: F1(1.2)=0.343; F2(1.2)=0.254; F3(1.2)=0.209; F5(1.2)=0.108???
這里的F1 F2 F3 F5又是從那里換算來的哪!
4. Operating Conditions:
- Peak Primary Current: IPKp =
2 × Pin
VPKmin × F2(Kv)
=
2 × 35.3
120 × 0.254
= 2.32A
- RMS Primary Current: IRMSp = IPKp × ?``F2`(`Kv)
3
= 2.32 × ?``0.`2`54
3
= 0.675A
- Peak Secondary current: IPKs =
2 × Iout
Kv × F2(Kv)
=
2 × 2
1.2 × 0.254
= 13.1A
- RMS Secondary Current: IRMSs = IPKs × ?``Kv` × ```
F3(Kv)
3
= 13.1 × ?``1.`2 `× ```
0.209
3
= 3.79A
5. Transformer:
- Primary inductance: Lp =
VPKmin
(1 + Kv) × fswmin × IPKp
=
120
(1 + 1.2) × 25 × 103 × 2.32
= 940mH
- Primary-to-secondary turns ratio: n =
VR
(Vout + Vf)
=
100
15 + 0.6
= 6.41
- Mains voltage range: VACmin = 88 Vac, VACmax = 264 Vac
- Minimum mains frequency: fL = 50 Hz
- DC Output Voltage: Vout = 15 V
- Maximum output current: Iout = 2A
- Maximum 2fL output ripple: DVo = 1V peak-to-peak
2. Pre-design Choices:
- Minimum switching frequency: fswmin = 25 kHz
- Reflected voltage: VR = 100V ??此反射電壓怎么來的啊
- Leakage inductance overvoltage: DV =70V
- Expected efficiency: h = 85%
3. Preliminary Calculations:
AN1059 APPLICATION NOTE
- Maximum Input Peak Voltage: VPKmin = VACmin × ?``2 = 264 × ?``2 = 373V
- Maximum Output Power: Pout = Vout × Iout = 15 × 2 = 30W
- Maximum Input Power: Pin =
Pout
h
× 100 =
30
85
× 100 = 35.3W
- Peak-to-reflected Voltage Ratio: Kv =
VPKmin
VR
=
120
100
= 1.2
- Characteristic functions value: F1(1.2)=0.343; F2(1.2)=0.254; F3(1.2)=0.209; F5(1.2)=0.108???
這里的F1 F2 F3 F5又是從那里換算來的哪!
4. Operating Conditions:
- Peak Primary Current: IPKp =
2 × Pin
VPKmin × F2(Kv)
=
2 × 35.3
120 × 0.254
= 2.32A
- RMS Primary Current: IRMSp = IPKp × ?``F2`(`Kv)
3
= 2.32 × ?``0.`2`54
3
= 0.675A
- Peak Secondary current: IPKs =
2 × Iout
Kv × F2(Kv)
=
2 × 2
1.2 × 0.254
= 13.1A
- RMS Secondary Current: IRMSs = IPKs × ?``Kv` × ```
F3(Kv)
3
= 13.1 × ?``1.`2 `× ```
0.209
3
= 3.79A
5. Transformer:
- Primary inductance: Lp =
VPKmin
(1 + Kv) × fswmin × IPKp
=
120
(1 + 1.2) × 25 × 103 × 2.32
= 940mH
- Primary-to-secondary turns ratio: n =
VR
(Vout + Vf)
=
100
15 + 0.6
= 6.41
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@lb0577
1.DesignSpecifications:-Mainsvoltagerange:VACmin=88Vac,VACmax=264Vac-Minimummainsfrequency:fL=50Hz-DCOutputVoltage:Vout=15V-Maximumoutputcurrent:Iout=2A-Maximum2fLoutputripple:DVo=1Vpeak-to-peak2.Pre-designChoices:-Minimumswitchingfrequency:fswmin=25kHz-Reflectedvoltage:VR=100V??此反射電壓怎么來的啊-Leakageinductanceovervoltage:DV=70V-Expectedefficiency:h=85%3.PreliminaryCalculations:AN1059APPLICATIONNOTE-MaximumInputPeakVoltage:VPKmin=VACmin×?``2=264×?``2=373V-MaximumOutputPower:Pout=Vout×Iout=15×2=30W-MaximumInputPower:Pin=Pouth×100=3085×100=35.3W-Peak-to-reflectedVoltageRatio:Kv=VPKminVR=120100=1.2-Characteristicfunctionsvalue:F1(1.2)=0.343;F2(1.2)=0.254;F3(1.2)=0.209;F5(1.2)=0.108???這里的F1F2F3F5又是從那里換算來的哪!4.OperatingConditions:-PeakPrimaryCurrent:IPKp=2×PinVPKmin×F2(Kv)=2×35.3120×0.254=2.32A-RMSPrimaryCurrent:IRMSp=IPKp×?``F2`(`Kv)3=2.32×?``0.`2`543=0.675A-PeakSecondarycurrent:IPKs=2×IoutKv×F2(Kv)=2×21.2×0.254=13.1A-RMSSecondaryCurrent:IRMSs=IPKs×?``Kv`×```F3(Kv)3=13.1×?``1.`2`×```0.2093=3.79A5.Transformer:-Primaryinductance:Lp=VPKmin(1+Kv)×fswmin×IPKp=120(1+1.2)×25×103×2.32=940mH-Primary-to-secondaryturnsratio:n=VR(Vout+Vf)=10015+0.6=6.41
原文件如下:
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@lb0577
原文件如下:[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/43/1152664792.gif');}"onmousewheel="returnimgzoom(this);">
再附完整官方提供l6561單端反激的應用資料1152664920.rar
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