5.1 fully integrated isolated dc-to-dc converter and half bridge...
TRANSCRIPT
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The World Leader in High Performance Signal Processing Solutions
5.1 Fully Integrated Isolated DC-to-DC
Converter and Half Bridge Gate Driver
with Integral Power Supply
1st International Workshop on Power Supply on ChipCork, Ireland
Baoxing ChenAnalog Devices, Inc.
804 Woburn St.Wilmington, MA 01887
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Outline
Integrated Signal and Power Isolation Needs
Power Converter Architecture
Transformer Structure
Converter Performance
Half Bridge Gate Driver Architecture
Summary
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Isolation Applications
PLCI/O and Communication
InstrumentationData Acquisition and Communication
Motor ControlSensing and Gate Drive
Patient MonitoringTo/From Patient
Power Supply
Plasma
TV
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Integrated Isolated Power Transfer Needs
Miniaturized, isolated dc-to-dc converter
High frequency energy conversion with low frequency energy regulation
Energy conversion optimized while regulation maintained through wide input and load ranges
• SENSORS
• ACTUATORS
• SWITCHES
• COMMUNICATIONSSIGNAL
ISOLATION
POWER
ISOLATION• CONTROLLERS
• PROCESSORS
• DISPLAYS
• USER INTERFACES
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Signal Transmission Operational Diagram
TRANSFER
THROUGH
TRANSFORMER
DETECT
DATA EDGES
ENCODE AS
PULSES
RISING
EDGE
FALLING
EDGE
DECODE
PULSES
RECONSTRUCT
DATA
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DC-to-DC Converter Architecture
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V1 = VDD + V1Cos(wt).
Region I: V1 < Vt/2 both saturated.
Region II: Vt/2 < V1 < VDD – Vt one linear, and one saturated.
Region III: VDD – Vt < V1 one linear, and the other will be off.
We want region III! Power delivered to load, not MN1/MN2!!!
Primary Switching States: Resonant Gate
Drive ZVS
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Transformer-Coupled Resonator
High Q Resonance Low Q Resonance
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Converter Stability
Modified PI Controller
(K Factor Type II)
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211
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1
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CC
CCRCR
CCR
CRk
ss
skG
p
p
c
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Power Transformer Radiation Minimized
Through Antiphase Center Tap
PCB Radiation Dominant-PCB Techniques Available
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Transformer Structures
Primary: Two Coils Connected in Center-Tapped
L = 8 nH, R = 0.8 W, Cs = 0.38 pF, Q = 19 at 300 MHz
Radius = 460 mm, Turns = 3, Width = 60 mm, Space = 7 mm
Secondary (1:1 for 5 V output): Two Coils Connected in Center-Tapped
L = 8 nH, R = 0.8 W, Cs = 1.2 pF, Q = 13 at 300 MHz
Radius = 460 mm, Turns = 3, Width = 60 mm, Space = 7 mm
>6 kV rms ISOLATION
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Converter Waveforms
Ch. 1 is the 450 kHz PWM signal.
Ch. 2 is the input supply.
Ch. 3 is the isolated supply output.
ZOOM-IN
340 MHz Noise => 170 MHz Tank
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Converter Performance: Saving Power
Compared to Discrete Solution
Est. Total Power: 490 mWSupply @ 20 mA Load: 275 mW
Optocoupler Data: 220 mW
Est. Total Power: 220 mWSupply @ 20 mA Load: 205 mW
iCoupler Data: 15 mW
2W DISCRETE
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Isolated Gate Drive Integration Needs
Size Reduction, Ease of Use, and Elimination of Duty-Cycle Limitation
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Half-Bridge Gate Driver Architecture
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500 mW DC-to-DC Converter and Half-
Bridge Gate Driver in 16-Lead SOIC
4-Channel Isolation
Integrated
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Summary
500 mW, 33% efficient integrated isolated DC-to-DC converter
architecture was reviewed.
The integrated signal and power integration provide
possibilities for total isolated system integration; reduces
total system cost and complexity.
Acknowledgement of contribution and assistance from ADI iCouplergroup members
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