ischia, 21-23 giugno 2006riunione annuale ge 2006 an innovative pwm loop control for vrms an...
Post on 28-Mar-2015
217 Views
Preview:
TRANSCRIPT
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
An innovative PWM loop An innovative PWM loop control control
for VRMsfor VRMsD.I.E.E.T. – Università di PalermoD.I.E.E.T. – Università di Palermo
Ing. Giuseppe Maria DI BLASI
Ing. Valeria BOSCAINO
Ing. Patrizia LIVRERI
Prof. Ing. Giuseppe CAPPONI
I&PC Division – STMicroelectronicsI&PC Division – STMicroelectronics
Ing. Filippo MARINO
Ing. Marco MINIERI
Power Applications LabPower Applications LabDIEET i&p
industrial & power conversion
division
http://www.dieet.unipa.it/labepdiblasi@diepa.unipa.itdiblasi@diepa.unipa.it
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
OutlineOutline
IntroductionIntroduction
Innovative current-sensingInnovative current-sensing
Two-module interleaved buck converterTwo-module interleaved buck converter
Prototype experimental resultsPrototype experimental results
ConclusionConclusion
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
Future generations of microprocessors: Supply Voltage < 1V
Supply Current > 100A
Faster transient slew rate (100A/s)
Introduction Introduction (1)(1)
Increasing speed data processing
Decreasing power consumption
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
Introduction Introduction (2)(2)
Large amount of output filter and on-board
decoupling capacitors
Low efficiency
Large ripple of steady-state output signal
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
Introduction Introduction (3)(3)
Multi-module interleaved buck converter
Low occupied space
Low cost Current-sharing control
The most important function on VRM applications is current sensingcurrent sensing
Good steady-state and transient performances
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
Vea
Low side
Power phase node
+
Vout
-
High side
+Vsense- Vref
250kHz
Clock
DRIVER
EA
S
RQ_Q
C
+ Vdc
Cs
L
R
ESR
Rs
RL
R2
C2
Current-voltage (IV) control loop
Innovative current-sensing Innovative current-sensing (1)(1)
Innovative sense to generate saw-tooth
Patent pendingInnovative
IV loop
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
Current-voltage (IV) control loop
Innovative current-sensing Innovative current-sensing (2)(2)
Current-mode topology
Simple current-sensing and current-sharing implementation
No dissipative elements introduced
No limitations of traditional current-mode control
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
Two-module interleaved buck Two-module interleaved buck converterconverter
Input voltage: Vdc = 12V
Output voltage: Vo = 1V
Switching frequency: fs = 250kHz
Output current: Io = 1÷60A
Output current slew-rate: S.R. = 60 A/μs
Maximum dynamic output voltage ripple: ∆Vo≤ 30mV
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
Prototype experimental results Prototype experimental results (1)(1)
Sensing signal at 1A load
Saw-tooth 03.6V
Saw-tooth signal has the same waveform
of inductor current
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
Prototype experimental results Prototype experimental results (2)(2)
Sensing signal at 20A load
Saw-tooth 04V
Saw-tooth signal has the same waveform
of inductor current
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
Prototype experimental results Prototype experimental results (3)(3)
IOUT=30A
Adaptive VoltagePositioning
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
Prototype experimental results Prototype experimental results (4)(4)
IOUT=30A
Ischia, 21-23 giugno 2006Riunione Annuale GE 2006
ConclusionConclusion
New current-sensing technique is proposed
New current-mode control is implemented
Experimental results on two-module buck
converter are excellent
top related