O Tinkercad é um modelador 3D concebido para simplificar o processo de modelação. Aplicação web, funciona em qualquer browser capaz de correr Web GL e não requer instalação de software. Esta aplica...
Full description
Full description
Full description
Benny Goodmans
Descripción: Benny Goodmans
Full description
Landau Lifshitz
UE procedure
Fluent in 3 Months promises a fast, easy, efficient, and proven method for learning languages. In it, international language hacker Benny Lewis argues that you don’t need a great memory or “the lan...Full description
Fluent in 3 Months promises a fast, easy, efficient, and proven method for learning languages. In it, international language hacker Benny Lewis argues that you don’t need a great memory or “…Descrição completa
Fluent in 3 Months promises a fast, easy, efficient, and proven method for learning languages. In it, international language hacker Benny Lewis argues that you don’t need a great memory or “the lan...
The Role of Performance Measurement in Continuous Improvement - Bond
TUTORIAL OF NON-ISOLATED DC/DC CONVERTERS IN CONTINUOUS MODE (1)
T s
A Buck converter is driven by a constant input voltage 30V 30 V . The switching frequency is 10kHz 10kHz , the L the L and and C of of the converter are 1mH 1 mH and and 10 μF . Sketch a circuit diagram of the the buck converter and the waveform of the current of C. C. Calculate the output ripple voltage when duty ratio of gate signal of the transistor is 0.5. 0.5. The converter is operating in continuous mode. 1
10k 1 1 I T 1 T V o s I C _ pos( avg ) L s C 2 2 2 C 2
V o DV in (0.5)(30) 15 V
I L
V o 1 D T s
v L
iT
i L
L +
V in in
T D
-
v D
iC C
+
V o
R
i D
(15)(0.5)
0.75 A L (10k )(1m) The output ripple voltage can be derived by the capacitance equation as: dv C o iC dt 1 1 I T 1 T Hence, V o s I C _ pos ( avg ) L s C 2 2 2 C 2
Evaluate the values of the duty ratio, D ratio, D,, of the gate signal, L, C and R of a Buck/Boost converter, shown in Fig. 2, operating in continuous mode such that the specification is: V o = 12V 12V , V in 5V , I o = 10A, ΔV o = 0.5V 0.5V , in = 5V Δ I L = 0.5A, f 0.5A, f s = 100kHz 100kHz
vT
v D
iT
i D
D V in in
+
-
T
v L
L i L
C
+
R
V o
iC
Fig. 2
ANS: D
12
1 D 5 The duty ratio of the gate signal is: 12 D or 0.7059 17 The change of current of L in on-state is: V DT DT I L in s L The inductance of the inductor is: (5)(12) L 70.059 H (17)(100k )(0.5) The load resistance is: V R o 1.2 I o The capacitance of the converter can be calculated from: V C o I o DT s C
A Ćuk converter operates at 50kHz 50 kHz switching frequency. The On-state time of the transistor is 12 μs. The input input voltage is 100V 100V . The load resistance varies between between 50-500Ω. Sketch a circuit diagram of a Ćuk converter. Considering the converter converter operating in continuous mode, mode, calculate the voltage ratings of all the circuit components.
Switching period is: 1 20 s T s 50k Duty ratio of the gate signal is: T 12 D o 0.6 T s 20 Hence the voltage conversion ratio is: V o D 1.5 V in 1 D and the output voltage is: V o (1.5)V in 150V
v L1
i L1
Vin
-
v L2
+
L1 +
vC1
L2
iC1 C1
T
vT iT
D
i L2
v D
iC
C2
+
R
Vo
i D
The voltage rating of the transistor is: V T _ max V in V o 250V The voltage rating of the diode is: V D _ max V in V o 250V The voltage rating of C1 is: V C 1 _ max V in V o 250V The voltage rating of C2 is: V C 2 _ max V o 150V The voltage ratings of L1 and L2 are: L1 _ max V o 150V L2 _ max V o 150V
