用NCP1650的兄臺們看過來,交流一下:)
交流一下:)
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@cm710
升壓電感的電感量對嗎?還有限流電阻的值可以減小點試試
限流電阻我從2個0.1歐并到4個0.1歐并應該不會是它的問題.
升壓電感感量從500uh變到1.3mh我沒好好算過.而且不太清楚輔助繞組的砸比.
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升壓電感感量從500uh變到1.3mh我沒好好算過.而且不太清楚輔助繞組的砸比.
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@hehe
我開始也是用他給的那個東東.但是驅動就像一個尖峰,打不開.全部用他demo給出的東東,還是驅動打不開.我只想做250w.我全部的大于1u的電容都用電解,會不會是這個原因.升壓電感我選了500u和1.3m,兩種.砸比19:1.急ing
500uH差不多,好象是你的咂比有問題,19:1在400V時次級就有21V已經超過了NCP1650的VCC上限了.所以你在低壓是能啟動而高壓不行(NCP1650過壓保護了)
NCP1650 Design Parts List
NCP1650 Design Aid
Provided by ON Semiconductor
For a system with the following specifications:
Pomax = 250 watts
Vinmax = 265 Vrms
Vinmin = 85 Vrms
fLINE = 50 Hz
fSwitch = 100 kHz
Vout = 400 volts
h = 0.9
L = 500 uH
The following parts are required2: Cout1 = 100 uF
acscale = 0.010 divider ratio C2 = 0.1 uF
RShunt = 0.03 ohms C3 = 10 nF
R3 = 1,500 ohms C4 = 1 nF
R7 = 600 ohms C7 = 47 uF
R8 = 10,000 ohms C8 = 22 uF
R9 = 68,000 ohms C9 = 3.3 uF
R10 = 10,000 ohms C11 = 1.0 nF
R13 = 100 kOhms CT = 470 pF
Notes:
1. Ripple current calculations for input and output capacitors are plotted on sheet 3a.
2. These component values are a recommended starting point, however, ON Semiconductor does not
guarantee that the circuit will meet all specifications. Normal troubleshooting and adjustments
may be necessary.
3. Additional components will be needed if implementation of an EMI filter is necessary.
我試著算了一下,你看看和你的結果一樣嗎?注意電感的峰值電流>4A
NCP1650 Design Parts List
NCP1650 Design Aid
Provided by ON Semiconductor
For a system with the following specifications:
Pomax = 250 watts
Vinmax = 265 Vrms
Vinmin = 85 Vrms
fLINE = 50 Hz
fSwitch = 100 kHz
Vout = 400 volts
h = 0.9
L = 500 uH
The following parts are required2: Cout1 = 100 uF
acscale = 0.010 divider ratio C2 = 0.1 uF
RShunt = 0.03 ohms C3 = 10 nF
R3 = 1,500 ohms C4 = 1 nF
R7 = 600 ohms C7 = 47 uF
R8 = 10,000 ohms C8 = 22 uF
R9 = 68,000 ohms C9 = 3.3 uF
R10 = 10,000 ohms C11 = 1.0 nF
R13 = 100 kOhms CT = 470 pF
Notes:
1. Ripple current calculations for input and output capacitors are plotted on sheet 3a.
2. These component values are a recommended starting point, however, ON Semiconductor does not
guarantee that the circuit will meet all specifications. Normal troubleshooting and adjustments
may be necessary.
3. Additional components will be needed if implementation of an EMI filter is necessary.
我試著算了一下,你看看和你的結果一樣嗎?注意電感的峰值電流>4A
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@武士
500uH差不多,好象是你的咂比有問題,19:1在400V時次級就有21V已經超過了NCP1650的VCC上限了.所以你在低壓是能啟動而高壓不行(NCP1650過壓保護了)NCP1650DesignPartsListNCP1650DesignAidProvidedbyONSemiconductorForasystemwiththefollowingspecifications:Pomax=250wattsVinmax=265VrmsVinmin=85VrmsfLINE=50HzfSwitch=100kHzVout=400voltsh=0.9L=500uHThefollowingpartsarerequired2:Cout1=100uFacscale=0.010dividerratioC2 =0.1uFRShunt=0.03ohmsC3 =10nFR3=1,500ohmsC4 =1nFR7=600ohmsC7 =47uFR8=10,000ohmsC8 =22uFR9=68,000ohmsC9 =3.3uFR10=10,000ohmsC11=1.0nFR13=100kOhmsCT=470pFNotes:1.Ripplecurrentcalculationsforinputandoutputcapacitorsareplottedonsheet3a.2.Thesecomponentvaluesarearecommendedstartingpoint,however,ONSemiconductordoesnotguaranteethatthecircuitwillmeetallspecifications.Normaltroubleshootingandadjustmentsmaybenecessary.3.AdditionalcomponentswillbeneededifimplementationofanEMIfilterisnecessary.我試著算了一下,你看看和你的結果一樣嗎?注意電感的峰值電流>4A
應該不會呀,我量了我的vcc,在14v左右,輔助繞組過100u得電容,應該不會在vcc上被掐死才對.對了,你的電容是電解的么?我只得是22u電容.
我把我的布線傳上來,請狠狠的批
我把我的布線傳上來,請狠狠的批
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@武士
Onsemi有NCP1650的設計軟件,我基本上是用這個軟件選擇參數.電感是個重要的參數.好象在高壓時容易開機.你說的陷死是什么意思?你設計要求的輸出功率是多少?電感好象太小
請問你說的這個軟件在哪里可以下載，可以給個地址嗎？能否發我的郵箱：nwu88@163.com，或者加我QQ：64811814，感謝！
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