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娴缨蔺
7 years ago
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1 流路 5. 3 路來便流流路路路 00V DC V DC /0A 來 5. 流 5. 3 了路路離路路不離濾路流流參路不路離不路 3 路率路 3 路來路說 5

2 率路濾路路離路路路濾流 ( V in ) 濾 LC 濾路濾流流 5. L Vin i L C V 5.. 濾漣率來率兩 T S 5.3 漣流漣 Q I T I L S L S V = = = (5.) C C 4 6C V I L = ( D) T L (5.) S T 5

3 V V = ( D) TS (5.) 6C L 串聯 (ESR) ESR 漣流 V,max max (5.3) I I V = T (5.4) I CO rms = ( D), 3 3 L S I Lo I Co Q T S 4 I DT S 5.3. 漣流 C 量量類 ( ESR ) 來漣流連流量連流連流連流 ESR 率度量 ESR 漣流 L L 連流流 5% V L = OUT L OUT di LOUT dt 53

4 ( Vsec V VF) Dmax LOUT > = 3( uh ) I F L sw (5.5) V T ) sec ( V F 流 ( D 0 ~ D3 ) I L OUT 連流 L 0.4 D max 0.0 ohm 35 uhc 00 uf 串聯 (ESR) 5.4 參數 3.3 流便了來參數說切率路切率若漣若率切路切率不 00 KHz 50 KHz 切率數 N 3. EC 流流路了例數 N = V D V DC / + V f ( D = Duty Ratio) (5.6) 54

5 80 V DC 90 V DC V DC n=6.3 TDK ER-8 數 60 數 0 量 8.7mH 率流流 MOSFETV DS 0 V 流 80 V DC 流 I m I I S = I + + I m N = =.83A ( VDC Dmax TS ) 流 = L N ( T ) 數 (5.7) IR IRF840 NMOS 500 V 流 8 A R Dson =0.85 ohm 路 L r C r 路 (80 V DC -0V DC ) 都 3 零切良率 (0V DC ) 量量流流數 (tanδ ) 量率金 55

6 t ~ ) t ~ ) 300nsecLr=0 ( t3 ( 5 t7 uhc 路 400pF(3.8) C r t56 8 π L r L C r (5.8) 3.64nFL r =0 uh nf/500 V D 0 -D 3 流 VDC V VD, max = = (5.9) N D I D,max I = I + (5.0) 33V DC 流 0.75 A 降流 0.55VLT SBL045CT 45V 流 0A D 4 ~D 7 V O = 00( V ) 流 8 A max IXYS DSEI -0A 000V 流 A 56

7 5.5 路路路 +8 V DC 了離路 3 +8V DC /0.A 立 VG VG- VG VG- VG3 VG3-3 路 5.4 T 流流流流 R 3 例流流路量量 Infineon ICEA0565Z(Current mode Ccontroller) 不說 5.4. 路 57

8 流流 R 35 R 36 TL43 路 5.5.5V DC 參路 R 34 C 30 TL43 路參益精 5.5. IC TL43 率流率 00kHz D max =0.7 ICEA056ZR Soft-Start 利 V SoftS 度 V SoftS V FB 便度 5.3V 便 5.6 來說 58

9 5.6. 流流利流流流利流流 V csth 流流了 0nsec 路了不 5.7 來說 5.7. 流說 59

10 5.6 路路 3.5 路路 5.8 路數便路益數路 ~ v DC ~ ve ~ ( s ) vm ~ ( s ) d ( s ) v ref (s) ~ v 5.8. N p =60N s =0L =35 uhc =00 ufv DC =00 VV OUT = V d =0.4R l =. ohmt s =0usr l =0.030mr c =0.00(3.8) v~ ~ d ( s ) v~ s FD( s) = ~ = 8 (5.) d (7.7 0 ) s + ( ) s + 說率 60

11 數率降 80 度益 ω 0 = 3604rad L C / sec Modulator Gm PWM 益 ~ d PWM Gain = Gm = v~ = (5.) V m m V m TI UC V Gm(s)=0.857 參 +5V DC +5V DC H(s) 5/=0.467 路路益 T OL (S) T OL = G = G = H G C C 5 ( ) s (7.7 0 ) s + (7.3 0 T C G m v~ ~ d 5 ) s + (5.3) T( s) = H G m v~ ~ d 來說 T OL (S). 益降. (s) 降 0dB 率率 (crossover frequency) ω T OL cross ω cross 來 ω cross 切率來 3. 6

零理論量 (over-shoot) 鈴 (ringing) 40 0 ~60 0 5.0 (a) (a) (b) 5.0. (a) 路 (b) 路率路數零 + sc R G C s( R // R ) C 5 6 = (5.4) 33 6 30 5 5 f = Z πr C (5.

12 零理論量 (over-shoot) 鈴 (ringing) 40 0 ~ (a) (a) (b) 5.0. (a) 路 (b) 路率路數零 + sc R G C s( R // R ) C 5 6 = (5.4) f = Z πr C (5.5) 5.0 (b) 0 路切率來量 T OL (S) 率 ω cross 50k ω cross = π = 570( rad / sec) (5.7) 0 PM = 40 O T ( j ω cross ) + GC ( jω corss ) = 80 (5.8) 6

0 38.8 + (tan 570C 5R6 ) 90 = 40 0 C 5 R6 = 0.00304 ω T OL (S) = G ( jω ) T ( jω ) = cross C cross cross + 570( R ( 570C R ) 33 // R 5 30 6 ) C 5 0.

13 (tan 570C 5R6 ) 90 = 40 0 C 5 R6 = ω T OL (S) = G ( jω ) T ( jω ) = cross C cross cross + 570( R ( 570C R ) 33 // R ) C = (5.9) ( R 4 33 // R30 ) C5 = 若 330nF 便兩 0k R 6.58k C5 R6 33 R k 路數 T ( S ) 路益數 T OL (S) 5.0 益 ωcross 570 rad/sec 63

14 40 0 IC UC355 見 IC 5.7 離路離路令利.5A 力 (TOSHIBA,TLP50, 力.5A max.) dv / dt 路不 5V -5V 零來例略不 5.4 (a) (b) 5.. 離路 (a) 路 (b)

15 IC 令都 RC 路來 5.3 IC RC 參數不 RC 數路利 Dead Time V GS _ S路 V C9 t ( R _ IC + R8 ) C9 = V ( e ) (5.0) PWM R _ IC 355PWM 串聯 V GS _ S路 V C9 PWM t R _ IC C9 = V e (5.) 利 IC 兩 NOR D 4 V GS _ S R 8 C 9 V GS _ S D 5 V GS _ S3 R 5 C 路 65

16 V C9 = V PWM ( e ( R t _ IC + R8 ) C9 V C9 ) = V t R _ IC C9 PWM e ` `

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untitled 論年來來例路流路路零了度領路例濾螺螺金降了論良量不切例立度立度類不路數例行降不量了螺金 ( W ) 1 了不良例金 ( W P ) 來降論來金金金了不良金流不流不率流金流金兩流流流來金數金裡流論利參數來論螺來不良串聯數串聯流金 ( W )