Download - Giao Trinh Mo Phong Mach Dien
KHOA C IN IN T
TI LIU TH NGHIM
M PHNG MCH IN(LU HNH NI B)
H v tn: .. M s sinh vin: ... Lp: .... Nhm: ....
Gio trnh th nghim m phng mch in
Nm 2011
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Gio trnh th nghim m phng mch in
HNG DN S DNG ORCAD PSPICEA. V S MCH TRONG ORCAD CAPTURE CIS.1. Khi ng chng trnh Capture CIS to mt s mi 2. Chn Menu File/New/Project, khi xut hin hp thoi New Project, nh du chn vo Analog Or Mixed A/D, nhp tn project cn chy chng trnh m phng v ng dn lu file, sau click OK. 3. Khi , s xut hin tip hp thoi Create Pspise Project, ta nh du vo Create a Blank Project, sau click Finish. 4. Cc bc cn thc hin v mt s mch. a) Chn linh kin v mch. - Dng chut click vo Place Part trn thanh cng c hoc g phm P t bn phm. - Trong ca s Place Part g tn linh kin vo Part , nu khng tm thy linh kin, nhn nt Add Library, chn th mc Pspise trong th vin, nh du cc linh kin cn chn b sung vo th vin. - Ch khi chn ngun v mass phi ng nht chy m phng ng.MT S LINH KIN THNG DNG
Part name in tr Bin tr T in Cun Dy Ngun p AC Ngun p sin Ngun p DC Ngun xung vung Ngun ph thuc ng h o Switch R R _ var C L Vac Vsin Vdc Vpulse E,F,G,H IPRINT, VPRINT SW_tClose SW_tOpen
Library Analog.olb Analog.olb Analog.olb Analog.olb Source.olb Source.olb Source.olb Source.olb Analog.olb Special.olb Anl_misc.olb Anl_misc.olb
b) Ni mch.Trang 1
Gio trnh th nghim m phng mch in
- Dng chut nhp vo nt Place Wire trn thanh cng c, lc ny biu tng chut thay i c dng hnh du cng, cho php ta ni chn cc linh kin li vi nhau. - Di chuyn chut ko di dy ni. - Click phm tri chut to mt gc vung v tip tc v. - Click phm phi chut, chn End wire kt thc ni. - Nu ni b dy, nhn nt Play Bus trn thanh Toolbar. c) X l s mch khi v xong. - Sau khi v xong ta tin hnh chnh sa cc thng s ca linh kin trn s theo nh yu cu ca bi. - Chnh sa cc thng s ca linh kin trn s mch bng cch double click ln gi tr ca linh kin. Khi xut hin hp thoi Display Properties. - Ti y nhp gi tr mi vo Value, ri chn OK. - nh du nhng im mun xem trn mch khi chy Orcad Pspice, vo menu Pspice ca Schematics, chn Markers sau chn tip Voltage Level. d) Cch khc. - Mun t gi tr ch linh kin, v d nh R, L, C, double click vo linh kin, in gi tr vo phn Value. - Bin tr R _ var c gi tr R = VALUE + SET + 0.001 , khi t gi tr cho bin tr phi t gi tr cho VALUE v SET. - Ngun p Vsin, t gi tr cho cc tham s sau: DC = ( trng). AC = bin ca tn hiu c s dng khi phn tch tn s (phn tch AC). Voff = 0. VAmpl = bin ca tn hiu c s dng khi phn tch qu . Freq = tn s ca tn hiu. td = 0. tf = 0. phase = 0.
- Ngun p mt chiu VSRC: t gi tr cho cc tham s sau: DC = gi tr ngun mt chiu.
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Gio trnh th nghim m phng mch in
AC = ( trng). Tran = ( trng).
- ng h o IPRINT , VPRINT: to ra bng gi tr v dng in v in p output file. - Double click vo linh kin v xut hin hp thoi Properties Editor, chn ch phn tch DC, AC hay TRAN bng cch nh vo gi tr 1 vo cn kho st. - Nu chn phn tch AC: Chn cc i lng cn hin th file ng ra nh sau: MAG (bin ) , PHASE (gc pha), REAL (phn thc), IMAG (phn o). e) Mt s lu khi t gi tr: Cch k hiu n v (cho in tr , t in , in p , dng in , tn s ). F P N u m k G T V d: - R1 c gi tr l 18k tc l 18 k. - C3 c gi tr 100u tc l 100 F. - Ngun V1 c gi tr 2 tc l 2V. - Ngun I2 c gi tr 30m tc l 30 mA. - Tn s f c gi tr 1 MEG tc l 1 MHz. (femto) (pico) (nano) (micro) (mili) (kilo) (giga) (tera) = 10-15. = 10-12. = 10-9. = 10-6. = 10-3. = 103. = 106. = 109. = 1012.
MEG (mega)
Cch k hiu trn u nh nhau i vi ch hoa v ch thng.
B. CHY PSPICE M PHNG MCH IN.1. Chn ch phn tch. a) Vo menu Pspice ca Schematics, chn New Simulation Profile, khi xut hin hp thoi New Simulation. Trong khung Name, g tn file cn chy m phng, xong click Create. b) Chn ch phn tch.
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Gio trnh th nghim m phng mch in
- Trc khi chy Orcad Pspice trong Schematics. Ty thuc vo yu cu ca bi th nghim phi chn ch phn tch thch hp (phn tch DC, AC, Transient) c nhiu ch phn tch nhng trong bi th nghim ch yu s dng phn tch AC (AC Sweep) v phn tch qu (Transient). - xc nh p ng tn s ca mch vo menu Pspice ca Schematics, chn Edit Simulation Settings v sau khi xut hin hp thoi Simulation Settings, kch chut chn Analysis Tab trong khung Analysis Type, click chut vo AC Sweep/Noise ci t nh sau: Trong AC Sweep Type chn Logarithmic, chn Decade, ri t gi tr cho cc thng s: Start Freq (tn s khi u thng chn l 1, ch phi khc 0). End Freq (tn s kt thc). Point/Decade (s lng im tnh ton trong mt Decade). p ng tn s c tnh ton khi ngun c tn s qut t tn s khi u n tn s kt thc. Click OK kt thc ci t hoc chn nhng phn tch khc. - xc nh p ng qu ca mch (xc nh dng in, in p ti tt c cc im trong mch theo thi gian) vo menu Pspice ca Schematics, chn Edit Simulation Settings v xut hin hp thoi Simulation Settings, click chut chn Analysis Tab trong khung Analysis Type v click chut vo Time Domain (Transient) ci t nh sau: Run to Time: nh thi gian chy m phng. Start saving data after: nh thi im bt u lu tr d liu phn tch. 2. Chy Orcad Pspice. - Sau khi ci t cc ch phn tch v chy m phng, ta vo Menu Pspice ca Schematics v chn Run hoc bm vo nt cng c Run trn thanh cng c. - Sau khi m phng xong Orcad Pspice s c chy t ng. - Da vo Orcad Pspice xem p ng tn s hoc qu ti tt c cc im trong mch.Trang 4
Maximum step size: nh bc phn tch. Nhn chut vo Apply chp nhn, sau click OK.
Gio trnh th nghim m phng mch in
- Sau khi chy Orcad Pspice, s xut hin th ca nhng im c nh du trn mch (nh du bng cch vo Menu Pspice ca Schematics, chn markers, chn tip Voltage Level). - xem th ca nhng im khc vo Menu Trace ca Orcad Pspice, chn Add Trace, hoc nhn nt cng c Add Trace trn thanh cng c xut hin mt danh sch cc im trn mch. - Nhn chn bt k im no m ta mun xem trong hp thoi danh sch . Nhn OK chp nhn. - xc nh gi tr ti mt v tr trn th vo Menu Trace ca Orcad Pspice chn cursor sau chn Display hay nhn chut vo nt cng c Display cursor. - Ca s Probe Cursor s xut hin. - Hai cursor c biu din cho th th nht di trc x, trong trng hp ny l V(C1;1). Ca s Probe Cursor cng s c hin th. Ta thy V(C1;1) s c lm du. - Khi s dng Cursor, nhn nt tri chut c biu din cho cursor th nht v nt phi chut th s dng cho cursor th hai. - Ta cng c th s dng hai phm mi tn tri v phi trn bn phm chnh gi tr c d dng hn dng chut. iu khin cursor th hai ta gi phm trong khi s dng hai phm mi tn ny. - t cursor th hai ln dng sng ca V(C2;2) hay tr chut vo k hiu ca V(C2;2) (c hnh ht trn) v click chut phi, k hiu ca V(C2;2) s c nh du. - Mun xem cc kt qu chi tit khc vo Menu View ca Orcad Pspice, chn Out put File hoc vo Menu Pspice ca Schematics, chn View Output File. xem vic phn b cc linh kin trong mch ta chn lnh View Netlist t Menu Pspice ca Schematic.
BI TH NGHIM M PHNG S 1Trang 5
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MT S NH LUT TRONG MCH INI. NH LUT PHN CHIA DNG IN
1. Dng in tng bng tng dng in trong cc nhnh r.
I = Ii2. Cc bc thc hin m phng:IP R 2 IP 6 V d c V 1 R 30
R
IN
T IP
R
IN
T
1 R IN R 6 T 3
2
c) V trong Orcad Pspice s mch nh trn, dng IPRINT trong th vin SPECIAL.OLB xc nh dng in trong cc nhnh. d) Chn ch phn tch Bias Point. e) Chy m phng ghi kt qu vo bng sau.I1 (A) I2 (A) I3 (A) I2/I3 R3/R2 Ghi ch
f) Tnh ton v so snh vi kt qu m phng.
II. NGUYN L XP CHNG
1. Dng in trong nhnh bt k ca mt mch tuyn tnh c th tnh ton bi s xp chng cc trng thi ring r do tc ng ca tng ngun vi iu kin khi ngun no tc ng th tt c cc ngun p khc in p bng khng, cn ton mch in vn gi nh trng thi ban u (khng thay i cc thng s ca mch).Trang 6
Gio trnh th nghim m phng mch in
2. Cc bc thc hin m phng:IP R 3 5 V d c V 1 R 30
R
IN
IT P
R
IN R 6
T 2
1
IP 3
R
V IN T 8 V d c
2
a) V trong Orcad Pspice s mch nh trn, dng IPRINT trong th vin SPECIAL.OLB xc nh dng in trong cc nhnh. b) Chn ch phn tch Bias Point cho ba trng hp: - Hai ngun V1, V2 cng tc ng. - Gi nguyn ngun V1 v cc thng s trong mch, trit tiu ngun V2. - Gi nguyn ngun V2 v cc thng s trong mch, trit tiu ngun V1 c) Chy m phng ghi kt qu vo bng.I1 (A) I2 (A) I3 (A) Ghi ch Hai ngun tc ng Ngun V1 tc ng Ngun V2 tc ng
d) Nhn xt v so snh vi kt qu tnh ton.
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Gio trnh th nghim m phng mch in
III. NH L CHUYN V NGUNI2 1 2 A 1 d c 2 R IN V 2 2 V I1 8 A 6 V d c0
I5IP R
IP
R
I N RT 1 0 . 2 5
IN R
T 2 3
IP
T
IP
R
IN
T
I2 I1IP V R 1
I3d c
I6IP R R 3 1 IN T
0 . 1 2 5 IN T
d c
I4
(Hnh a)I2 1 2 A d c 2 IP R IN T IP R IN T
1
I5IP R
IP IN
R T R
IN
T
R
1
0 . 2 5
I2 I1IP R IN
2
V
4 d c
I3V I1 8 A d c 3 V 5 1 d c 2 V
I6
0 . 1 22 5V
T 6 V
IP
R
IN
T
d cV
I4R 1 3
V d c 0 a) V trong Orcad Pspice s mch nh6 trn, dng IPRINT trong th vin (Hnh b) SPECIAL.OLB xc nh dng in trong cc nhnh. IPRINT c lp
trong mch nh hnh trn. b) Chn ch phn tch Bias Point cho hai trng hp: - Phng php thng thng (hnh a). - Phng php chuyn v ngun. Chuyn v hai ngun p V1 v V2 (hnh b). c) Chy m phng v ghi kt qu vo bngI1 (A) I2 (A) I3 (A) I4 (A) I5 (A) I6 (A) Ghi ch Hnh a Hnh b
d) Nhn xt kt qu v so snh vi kt qu tnh ton.Trang 8
Gio trnh th nghim m phng mch in
IV. NH L THEVENIN NORTON
Mt mng mt ca bt k u c th a v mt mch tng ng n gin gm: 1. Mt ngun p mc ni tip vi tr khng Z gi l mch tng ng Thevenin. Ngun p ny c gi tr bng in p h mch ca mng mt ca v tr khng Z c l tr khng nhn vo ca khi trit tiu tt c cc ngun c lp. 2. Mt ngun dng mc song song vi tr khng Z gi l mch tng ng Norton. Ngun dng c gi tr bng dng in ngn mch qua hai u mng mt ca. ZTa
I Mng mt ca
a
a
Ub
V = Uh
Ub
I = Ingan
ZT Ub
Mch tng ng Thevenin 3. Cc bc thc hin m phng.
Mch tng ng Norton
a) V trong Orcad Pspice s mch in, dng IPRINT v VPRINT trong th vin SPECIAL.OLB xc nh dng in, in p theo hai phng php sau: - Phng php thng thng.Trang 9
Gio trnh th nghim m phng mch in
- Phng php mch tng ng Thevenin v mch tng ng Norton. b) Gi s = 1rad/s. Chn ch phn tch AC vi tn s bt u bng 0.159, Tn s kt thc bng 0.159 v s im bng 1. c) Ghi cc kt qu m phng vo bng 1. Bng 1:i lng Bin (MAG) Gc pha (PHASE) Phn thc (REAL) Phn o (IMAG)
URti IRti Uh Ingn Zthevenin 3.1. Phng php thng thng. Dng VPRINT v IPRINT trong th vin SPECIAL.OLB xc nh in p hai u Rti v dng in qua ti. Chy m phng, ghi kt qu vo bng 1.IP R 1 0 R 1= 44V 5 1
R
IN a
T
R I1 4 AA C
1
2
a cP H A S E L
3
t a iE = 9 0
2 5 VA C P H
a cA S
5 b
0 3.2. Tm dng in v in p trn ti dng mch tng ng Thevenin Norton.
a) B in tr ti (Rti), cho hai im a, b h mch v xc nh in p hai u ab (Uh) dng VPRINT2. Chy m phng v ghi kt qu vo bng 1.a R I1 4 AA C
1
R 1 0
2
a cP H A S E L
3 1= 44V5 1
2 5 VA C P H
a cA S E = 9 0
b0
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Gio trnh th nghim m phng mch in
b) Cho hai im a, b ngn mch v xc nh dng ngn mch Ingn. Chy m phng v ghi kt qu vo bng 1.IP R IN a R I1 4 AA C
T
1
R 1 0
2
a cP H A S E L
3 1= 44V 5 1
2 5 VA C P H
a cA S E = 9 0
b0
c) Xc nh tr khng Thevenin. Trit tiu tt c cc ngun c lp trong mch. Cp vo hai u a, b mt ngun dng AC c bin 1A v gc pha l 0o, xc nh in p hai u a, b. y chnh l gi tr tr khng ZT gia hai im a, b; (v ). Chy m phng v ghi kt qu vo bng 1. Z= I U
a R 3 L 2 4 b0
1 R 2 1 0 I1 1 A a c
d) Xy dng s tng ng Thevenin v Norton. Mc vo hai u a, b ca mch tng ng Thevenin mt in tr ti R ti = 5. Xc nh cc gi tr dng in v in p trn ti. Ghi kt qu m phng vo bng 2. Mc vo hai u a, b ca mch tng ng Norton mt in tr ti Rti = 5. Xc nh cc gi tr dng in v in p trn ti. Ghi kt qu m phng vo bng 2.I P R I N T I P R I N T
a ZT U = Uh0
a ZT Rti = 5 b0
Rti = 5 b
I = Ingn
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Gio trnh th nghim m phng mch in
Mch Thevenin
Mch Norton
Mch m phng
i lng
Bin
Gc pha
Phn thc
Phn o
Thevenin Norton
URti IRti URti IRti
BI TH NGHIM M PHNG S 2
CC CH LM VIC CA MCH IN BA PHA Ngun i xng, ti i xng mc hnh sao vi hai trng hp. - Trung tnh ti ni vi trung tnh ngun, - Trung tnh ti khng ni vi trung tnh ngun. Ngun i xng, ti khng i xng mc hnh sao vi hai trng hp. - Trung tnh ti ni vi trung tnh ngun. - Trung tnh ti khng ni vi trung tnh ngun. Ngun i xng, ti i xng mc hnh tam gic. Ngun i xng, ti khng i xng mc hnh tam gic.300V
200V
100V
0V
-100V
-200V
-300V 0s V(R1:1,R1:2) 10ms 20ms V(R2:1,R2:2) 30ms V(R3:1,R3:2) 40ms 50ms Time 60ms 70ms 80ms 90ms 100ms
Dng sng in p ngun ba pha i xng
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Gio trnh th nghim m phng mch in400V
300V
200V
100V
0V
-100V
-200V 0s V(R1:1,C1:2) 10ms 20ms V(R2:1,L1:2) 30ms V(R3:1,R4:2) 40ms 50ms Time 60ms 70ms 80ms 90ms 100ms
Dng sng in p trn ti ba pha mt i xng I. NGUN I XNG, TI I XNG NI SAO. V trong Orcad Pspice s nh mch sau. Dng VPRINT1, VPRINT2 v IPRINT c lp trong mch xc nh in p v dng in pha, in p gia trung tnh ti v trung tnh ngun, theo hai trng hp: trung tnh ti ni v khng ni vi trung tnh ngun (sinh vin t v mch). Chn ch phn tch AC vi tn s 50Hz, s im bng 1. Chy m phng v ghi kt qu vo bng 1.
I P V 1 2 2 0 V a c R 2 0 A C V P 2 2 P V 3 2 P H H 2 A H 2 A A S 0 V S 0 V S E = 2 2 0 I P 0 I P 1
R
I N
T
R
I N
T
a c R E
A
C
2 0 = - 1 3 2
0
R
I N
T
a c R E
A
C
2 0 = 1
0
Bng 1:i lng Trung tnh ti khng ni trung tnh ngun Bin Gc pha Trung tnh ti ni trung tnh ngun Bin Gc pha
UA UN0 IA IB ICTrang 13
Gio trnh th nghim m phng mch in
I0 Nhn xt kt qu m phng trong hai trng hp.
II. NGUN I XNG, TI KHNG I XNG NI SAO.
V
1
R 1 7 P 3 V a c H A S E 3 = 0 0
1
C 0
I P
1
R
I N
T
. 0
3 3
3
A
C
V
2
R 1 7 P 3 V a c H A S E 3 = 0
2
1 0
L 1 3 0
I P 2
R
I N
T
0
A
C
- 1 2
NI P 4 0 R I N T
V
3
R 3 V a c H A S E 3 = 1 0
3
R 3 2 0
A
1 7 C P
Lp li cc bc m phng nh trong phn ti i xng. V mch ng vi hai trng hp: trung tnh ti ni v khng ni vi trung tnh ngun. Chy m phng ghi kt qu vo bng 2. Bng 2:i lng Trung tnh ti khng ni trung tnh ngun Bin Gc pha Trung tnh ti ni trung tnh ngun Bin Gc pha
UA UB UC UN0Trang 14
Gio trnh th nghim m phng mch in
IA IB IC I0 Nhn xt kt qu m phng trong hai trng hp.
Thay ngun Vac bng ngun Vsin. Chn ch phn tch Transient vi thi gian chy khong 0.1s. Kho st v v dng sng dng in, in p trong hai trng hp ti i xng v ti khng i xng (khi trung tnh ti khng ni vi trung tnh ngun).V 4 R R A O H R A O H R A O H E M F A E M F A E M F A Q P F S Q P F S Q P F S 1
V
F V V 5 P F V V 6 P F V V P
2 0 = 5 0 L = 2 2 = 0 E R =2 0
0
0
V
2 0 = 5 0 = 2 2 0 = 0 E R =3 - 1 2 0 L 2 0 = 5 0 L = 2 2 0 = 0 E = 1 2 0
Dng sng in p khi ti i xng
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Gio trnh th nghim m phng mch in
Dng sng dng in khi ti i xng
V
1
R R A O H R A O H R A O H E M F A E M F A E M F A Q P F S Q P F S Q P F S = =
1
C 3 3 L 1 3 1
1
V
F V V 2 P F V V 3 P F V V P
L E
=
3 0 5 0 1 7 0 R= 2 0
2 0
= L E = = E =
0
=
V
3 0 5 0 1 7 3 0 R= 3 - 1 2 0 3 0 5 0 1 7 3 0 = 1 2 0
R 3 0
4
L
=
Dng sng in p khi ti khng i xng
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Gio trnh th nghim m phng mch in
Dng sng dng in khi ti khng i xng
III. NGUN I XNG, TI I XNG NI TAM GICI P V 1 A A C 1 P 0 V a c H A S E I P V 2 B = I N T - 1 2 0 R I N = T 0 I P R 2 1 R I N R 2 I P R 2 3 R I N T C T 2 I P R I N T R I N T
0
A
C
1 P
0 V a c H A S E I P R
V
3
A
C
1 P
0 V a c H A S E
=
1
2
0
V trong Orcad Pspice s mch trn. Dng VPRINT1, VPRINT2 v IPRINT c lp trong mch xc nh in p v dng in pha, in p gia trung tnh ti v trung tnh ngun, theo hai trng hp: trung tnh ti ni v khng ni vi trung tnh ngun (sinh vin t v mch). Chn ch phn tch AC vi tn s 50Hz, s im bng 1. Chy m phng v ghi kt qu vo bng 3. Bng 3:i lng Ti i xng Bin Gc pha Ti khng i xng Bin Gc pha
UAB
Trang 17
Gio trnh th nghim m phng mch in
UBC UCA IA IB IC IAB IBC ICA
IV. NGUN I XNG, TI KHNG I XNG NI TAM GIC. V 11 0 V V A 2 C P a c H A S E = 0 B a c P H A S E = - 1 2 0 C R 2 a c P H A S E = 1 2 0 1 L 1 2 H C R 2 2 A C 1
0 . 5 F
1 0 V0
V
A 3
1 0 V A C
Lp li cc bc m phng nh trong phn ti i xng. V mch ng vi hai trng hp: trung tnh ti ni v khng ni vi trung tnh ngun. Chy m phng ghi kt qu vo bng 3. Nhn xt kt qu m phng trong hai trng hp.
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Gio trnh th nghim m phng mch in
Thay ngun Vac bng ngun Vsin. Chn ch phn tch Transient vi thi gian chy khong 0.1s. Kho st v v dng sng dng in, in p trong hai trng hp ti i xng v ti khng i xng.V 1 B E M F Q P F = = 5 0 0 1 0 R 1 2 E M F Q P F = = A = 0 5 0 1 0 R 2 3
F V V V
R A O 2
L
=
R 2
2 C
0
F V V V
R A O 3
L
F V V
R A O
E M F
Q P F
L
= =
=
5 0
0 1 0
Dng sng in p khi ti i xng
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Gio trnh th nghim m phng mch in
Dng sng dng in khi ti i xngV 1
V
F V V 2 P F V V 3 P F V V P
R A O H R A O H R A O H
E M F A E M F A E M F A
Q P F S Q P F S Q P F S
= L E = = = =
5 0R 2 1
0 1 0 0 . 5 1 2 H F 0 C 1
0
V
5R 0 2 L L = 1 0 1 = 0 2 2 E = - 1 2 0 = = 5 0 0 1
L E
= =
1
0 2 0
Dng sng in p khi ti khng i xng
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Gio trnh th nghim m phng mch in
Dng sng dng in khi ti khng i xng
BI TH NGHIM M PHNG S 3
C TUYN BIN TN PHA TN CA MCH CNG HNG, MCH LC RLCI. MCH CNG HNG
Mch cng hng l mch in trong xut hin hin tng cng hng. Tn s xy ra hin tng cng hng ta gi l tn s cng hng ( o) v o mc la chn tn s ca mch ta da vo h s phm cht (Q).2.4V 2.0V
1.6V
1.2V
0.8V
0.4V
0V 1.0Hz V(R1:1,R1:2)
3.0Hz V(L1:1,L1:2)
10Hz V(C1:2,C1:1)
30Hz
100Hz Frequency
300Hz
1.0KHz
3.0KHz
10KHz
c tuyn bin tn ca mch cng hng ni tip. Mch cng hng ni tip: cc phn t R, L, C trong mch c mc ni tip. - Tn s cng hng: 0 = - H s phm cht: Q =1 LC
1 L R C
Mch cng hng song song: cc phn t R, L, C trong mch c mc song song. - Tn s cng hng: 0 = - H s phm cht: Q = R 1. Mch cng hng ni tip.1 V 0 V V a c d c 1 1 0 R
1 LC
C 1 L0
1
L 5
1 0 0 m
2 C 1 1 0 u
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0
Gio trnh th nghim m phng mch in
Cc bc thc hin m phng: - V trong Orcad Pspice s mch nh trn. - Chn ch phn tch AC, logarithmic, tn s bt u l 1Hz, tn s kt thc l 10kHz, s im l 20. - o in p trn cc phn t R, L, C (bin v gc pha). - Chy m phng v v cc c tuyn bin tn, pha tn ca UR, UL, UC. T , xc nh tn s cng hng ca nhnh fo = Hz. - Tnh ton tn s cng hng v h s phm cht ca nhnh. - Nhn xt kt qu.
- V cc c tuyn bin tn v pha tn ca UR , UL , UC.
c tuyn bin tn ca UR , UL , UC
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Gio trnh th nghim m phng mch in
c tuyn pha tn ca UR , UL , UC 1. Mch cng hng song song.
2 1 0 A A a c d c I 1 R 1 1 0 0 1 L 1 4 0 0 m C 1 2 0 u
01.0A
0.8A
0.6A
0.4A
0.2A
0A 10Hz -I(R1) -I(L1) -I(C1)
30Hz
100Hz Frequency
300Hz
1.0KHz
c tuyn bin tn ca mch cng hng song song. Cc bc thc hin m phng: - V trong Orcad Pspice s mch nh trn. - Chn ch phn tch AC, logarithmic, tn s bt u l 10Hz, tn s kt thc l 1kHz, s im l 20. - o dng in trn cc phn t R, L, C (bin v gc pha). - Chy m phng v v cc c tuyn bin tn, pha tn ca IR, IL, IC. T , xc nh tn s cng hng ca nhnh fo = Hz. - Tnh ton tn s cng hng v h s phm cht ca nhnh. - Nhn xt kt qu.
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Gio trnh th nghim m phng mch in
- V cc c tuyn bin tn v pha tn ca IR , IL , IC.
c tuyn bin tn ca IR , IL , IC
c tuyn pha tn ca IR , IL , IC II. MCH LC R-L-C. Mch lc thng thp dng R-C: tn s ct f C =R V 1 1 V thp cdng R-C. a 1. Mch lc thng 0 V d c 1 k 1
1 . 2 RC
Mch lc thng cao dng R-L: tn s ct f C =
R 2 LC 1 5 u
1Trang 24
0
Gio trnh th nghim m phng mch in
Cc bc thc hin m phng: - V trong Orcad Pspice s mch nh trn. - Chn ch phn tch AC, logarithmic, tn s bt u l 1Hz, tn s kt thc l 10kHz, s im l 20. - o dng in trn cc phn t R, L, C (bin v gc pha). - Chy m phng v v cc c tuyn bin tn, pha tn ca IR, IL, IC. T , xc nh tn s ct t gin Bode fc = Hz. - Tnh ton tn s ct. - Nhn xt kt qu.
- V cc c tuyn tn s ca mch R-C.
c tuyn tn s ca mch R-C
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Gio trnh th nghim m phng mch in
Thay ngun Vac bng ngun Vsin nh hnh v. Chn ch phn tch Transient vi thi gian chy khong 0.5s. Kho st v v dng sng tn hiu vo, ra trn t in C1 ca mch.R V = = 2 = 1 0 1 5 k C 1 5 u 1
V V F
O A R
F M E
F P Q
L
0
1
- V dng sng in p trn t0C1.
Dng sng in p trn t C1 2. Mch lc thng cao dng R-LV c 1 R 1 1 V a 0 1 0 2 L 1 1 1 H
0
Cc bc thc hin m phng: - V trong Orcad Pspice s mch nh trn. - Chn ch phn tch AC, logarithmic, tn s bt u l 1Hz, tn s kt thc l 10kHz, s im l 20. - Chy m phng v v cc c tuyn bin tn, pha tn ca IR, IL, IC. T , xc nh tn s ct t gin Bode fc = Hz. - Tnh ton tn s ct. - Nhn xt kt qu.
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Gio trnh th nghim m phng mch in
- V cc gin Bode.
Gin Bode Thay ngun Vac bng ngun Vsin nh hnh v. Chn ch phn tch Transient vi thi gian chy khong 0.5s. Kho st v v dng sng tn hiu vo, ra trn cun dy L1 ca mch.R 1 V V F O A R F M E F P Q = L V = = 2 0 1 5 0 1 0 1 0 2 L 1 1 H
0- V dng sng in p trn cun dy L1.
Dng sng in p trn cun dy L1 - Nhn xt dch pha gia tn hiu vo v ra.
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Gio trnh th nghim m phng mch in
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Gio trnh th nghim m phng mch in
BI TH NGHIM M PHNG S 4
QU TRNH QU TRONG MCH TUYN TNHQu trnh qu l qu trnh xy ra khi mch chuyn t mt ch xc lp ny sang ch khc. Mch qu cp mt R-C: hng s thi gian ca mch = RC (s). Mch qu cp mt R-L: hng s thi gian ca mch = L/R (s). Mch qu cp hai R-L-C, in tr ti hn c nh ngha: Rth = 2 L . Ty ( ) C
theo s tng quan gia in tr R ca mch v in tr ti hn Rth, ngi ta chia mch qu cp hai ra lm ba ch : - R > Rth : ch khng dao ng. - R = Rth : ch ti hn. - R < Rth : ch dao ng. I. MCH QU CP MT R-CT C 1 5 V d c V 1 L O 2 K 1 S E = 0 . 1 1 C 1
R 1 k
2 0 0 u
0
Cc bc thc hin m phng: - V trong Orcad Pspice s mch nh trn (ng vi hai trng hp C1 = 200F v C1 = 30F). - Chn ch phn tch Transient vi thi gian chy l 2s. - Chy m phng v v cc dng sng in p trn t C 1 v dng in trong mch ng vi hai trng hp ca t C1.
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Gio trnh th nghim m phng mch in
T C1 = 200F
Dng sng in p trn t
Dng sng dng in trong mch T C1 = 30F
Dng sng in p trn tTrang 30
Gio trnh th nghim m phng mch in
Dng sng dng in trong mch Thay ngun Vdc bng ngun xung vung vi cc thng s trong mch nh hnh v.T C 1 L O 2 S E = R 1 k C 1 2 0 0 u 0 . 1 1
V 1 = 0 V 2 = 5 V 1 K 1 T D = 0 T R = 0 T F = 0 P W = 1 0 0 m P E R = 2 0 0 m0
- Chy m phng v v cc dng sng in p trn t C 1 v dng in trong mch ng vi hai trng hp ca t C1. - Chn ch phn tch Transient, thi gian chy l 2s. - Chy m phng v v cc dng sng in p trn t C 1 v dng in trong mch.
Dng sng in p trn t
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Gio trnh th nghim m phng mch in
Dng sng dng in trong mch - Nhn xt cc th, tnh ton cc hng s thi gian ca mch.
II. MCH QU CP HAI R-L-C
T C 1 V 1
L O K 1 2
S
E
R
=
1
5 0 m
C
1
1 m L 1 1 0 m
5 V
d c
0
Cc bc thc hin m phng: - V trong Orcad Pspice s mch nh trn vi R1 = 80 Chn ch phn tch Transient, thi gian chy l 1s. - Chy m phng v v dng sng in p trn t C1 v dng in trong mch vi cc trng hp: Ch khng dao ng R1 = 80. Ch ti hn R1 = Rth = . Ch dao ng R1 = 0.4.
Ch khng dao ng R1 = 80.
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Gio trnh th nghim m phng mch in
Dng sng in p trn t
Dng sng dng in trong mch Ch ti hn R1 = Rth.
Dng sng in p trn t
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Gio trnh th nghim m phng mch in
Dng sng dng in trong mch Ch dao ng R1 = 0.4.
Dng sng in p trn t
Dng sng dng in trong mch - Nhn xt cc th, tnh ton cc hng s thi gian ca mch.
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Gio trnh th nghim m phng mch in
Thay ngun Vdc bng ngun xung vung vi cc thng s trong mch nh hnh v.T C L 1 O S E 2 R= 2 0 1 2 C 1
1 U
V 1 V 2 T D T R T F P W P E
= = = = = R
0 2 0
1
1 L 4 2 1
0 0 3
V
1
=
=
6
0
- V trong Orcad Pspice s mch nh trn vi R1 = 20 Chn ch phn tch Transient, thi gian chy l 100s. - Chy m phng v v dng sng in p trn t C1 v dng in trong mch vi cc trng hp: Ch khng dao ng R1 = 20. Ch ti hn R1 = Rth = . Ch dao ng R1 = 0.4.
Ch khng dao ng R1 = 20.
Dng sng in p trn t
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Gio trnh th nghim m phng mch in
Dng sng dng in trong mch Ch ti hn R1 = Rth.
Dng sng in p trn t
Dng sng dng in trong mch
Ch dao ng R1 = 0.4.
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Gio trnh th nghim m phng mch in
Dng sng in p trn t
Dng sng dng in trong mch - Nhn xt cc th.
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