Introduction to Isolated Topologies
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1 Power Supply Design Seminar (Demo Hall Presentation) Introduction to Isolated Topologies TI Literature Number: SLUP , 217 Texas Instruments Incorporated Power Seminar topics and online power training modules are available at:ti.com/psds
2 Introduction to Isolated Topologies Chris Sarli, Power Design Services Engineer Texas Instruments - 216/17 Power Supply Design Seminar
3 Agenda What is isolation and Why do we use it? Identifying types of Isolation Isolated Topologies Texas Instruments - 216/17 Power Supply Design Seminar 2
4 What is Isolation? Input Output Power Source Load Types of Isolation Inductive Isolation Capacitive Isolation Optical Isolation Texas Instruments - 216/17 Power Supply Design Seminar 3
5 Identify the types of Isolation Texas Instruments - 216/17 Power Supply Design Seminar 4
6 Topologies Typical Operating Ranges Flyback: <1W Flybuck: <1W Forward: 1W to 25W Half Bridge: 25W to 5W Full Bridge: 4W to 1 kw+ Texas Instruments - 216/17 Power Supply Design Seminar 5
7 Flyback Converter Recommended for less than 1W output 3 Components = Low Cost Stores Energy during ON Delivers Energy during OFF Texas Instruments - 216/17 Power Supply Design Seminar
8 Flyback Converter ON OFF V G1 Recommended for less than 1W output + nv OUT n : 1 I DIODE V DS I FET -nv OUT V OUT n Transformer acts as a Load, Storing Energy I FET I DIODE Texas Instruments - 216/17 Power Supply Design Seminar time 7
9 Flyback Converter ON OFF V G1 Recommended for less than 1W output + nv OUT n : 1 I DIODE V DS I FET -nv OUT V OUT n Transformer acts as a Source, Delivering Energy I FET I DIODE Texas Instruments - 216/17 Power Supply Design Seminar time 8
10 Fly-Buck Converter V G1 Recommended for less than 1W output I DIODE I FET I FET V DIODE I PRI I DIODE Texas Instruments - 216/17 Power Supply Design Seminar 9
11 Fly-Buck Converter V G1 Recommended for less than 1W output I DIODE I FET I FET V DIODE I PRI I DIODE Texas Instruments - 216/17 Power Supply Design Seminar 1
12 Forward Converter Recommended for between 1W and 25W output Secondary resembles Buck 6 Components (single switch) Delivers power during ON and OFF Texas Instruments - 216/17 Power Supply Design Seminar 11
13 Forward Converter ON OFF V G1 Recommended for between 1W and 25W output 2 n : n : 1 V DS - I FET n - n I FET Texas Instruments - 216/17 Power Supply Design Seminar I D3 time 12
14 Forward Converter ON OFF V G1 Recommended for between 1W and 25W output 2 n : n : 1 V DS - I FET n - n I FET Texas Instruments - 216/17 Power Supply Design Seminar I D3 time 13
15 Forward Converter ON OFF V G1 Recommended for between 1W and 25W output 2 n : n : 1 V DS - I FET n - n I FET Texas Instruments - 216/17 Power Supply Design Seminar I D3 time 14
16 Forward Converter 1-Switch 2-Switch Active Clamp # of FETs FET Voltage 2 x / (1-D) Q2 Current N/A I PRIMARY I MAGNETIZING Snubber Y N N 5% Duty Limit Y Y N 1-Switch 2-Switch Active Clamp Texas Instruments - 216/17 Power Supply Design Seminar 15
17 Half-Bridge Recommended for between 25W and 5W output 6 Components + Cap Div Double ended (symmetric) 4 Switching states Texas Instruments - 216/17 Power Supply Design Seminar 16
18 Half-Bridge Recommended for between 25W and 5W output V G1 V G2 n : 1 : 1 2 V DS n - 2n I Q1 I D1 Texas Instruments - 216/17 Power Supply Design Seminar I L 17
19 Half-Bridge Recommended for between 25W and 5W output V G1 V G2 n : 1 : 1 2 V DS n - 2n I Q1 I D1 Texas Instruments - 216/17 Power Supply Design Seminar I L 18
20 Half-Bridge Recommended for between 25W and 5W output V G1 V G2 n : 1 : 1 2 V DS n - 2n I Q1 I D1 Texas Instruments - 216/17 Power Supply Design Seminar I L 19
21 Half-Bridge Recommended for between 25W and 5W output V G1 V G2 n : 1 : 1 2 V DS n - 2n I Q1 I D1 Texas Instruments - 216/17 Power Supply Design Seminar I L 2
22 Half-Bridge LLC Recommended for between 25W and 5W output Texas Instruments - 216/17 Power Supply Design Seminar 21
23 Half-Bridge LLC Recommended for between 25W and 5W output Q1 Q2 I Q1 Lr I Q2 Cr n : 1 : 1 I D1 Lp D1 D2 Load Primary current = sine wave plus magnetizing current Secondary = sine wave Switching frequency = LrCr resonant Texas Instruments - 216/17 Power Supply Design Seminar
24 Half-Bridge LLC Recommended for between 25W and 5W output Source Q1 I Q1 Lr Cr n : 1 : 1 VSEC D1 Q2 I Q2 Lp D2 I D2 Load Complex, but yields excellent Efficiency Texas Instruments - 216/17 Power Supply Design Seminar
25 Full-Bridge Recommended for 4W to 1kW+ output 8 Components Double ended (symmetric) 4 Switching states Q1/Q3 gate drives tied Q2/Q4 gate drives tied Texas Instruments - 216/17 Power Supply Design Seminar 24
26 Full-Bridge Recommended for 4W to 1kW+ output V G1 = V G4 G3 V G2 = V G3 G4 2 V DS1 - n - n I Q1 I D1 Texas Instruments - 216/17 Power Supply Design Seminar I L 25
27 Full-Bridge Recommended for 4W to 1kW+ output V G1 = V G4 G3 V G2 = V G3 G4 2 V DS1 - n - n I Q1 I D1 Texas Instruments - 216/17 Power Supply Design Seminar I L 26
28 Full-Bridge Recommended for 4W to 1kW+ output V G1 = V G4 G3 V G2 = V G3 G4 2 V DS1 - n - n I Q1 I D1 Texas Instruments - 216/17 Power Supply Design Seminar I L 27
29 Full-Bridge Recommended for 4W to 1kW+ output V G1 = V G4 G3 V G2 = V G3 G4 2 V DS1 - n - n I Q1 I D1 Texas Instruments - 216/17 Power Supply Design Seminar I L 28
30 Topologies Summary Topology Power Level Benefits Drawbacks Cost Flybuck <1 W Simple to design Small form factor No optocoupler FB Lower Accuracy regulation Duty Cycle limited to <5% to maintain decent regulation Lowest Flyback <1 W Low parts count Single magnetic Wide input-voltage range Low output power Poor efficiency at high power levels High peak currents Cross regulation problems High-voltage power switch Low 1 Switch Forward 1 W to 25 W Medium output power Good cross regulation with coupled inductor Potential for >5% duty-cycle Limited input range Power switch = 2 Transformer reset Moderate Texas Instruments - 216/17 Power Supply Design Seminar
31 Topologies Summary Topology Power Level Benefits Drawbacks Cost Half-Bridge 25 W to 5 W Medium output power Power switch = Coupled inductor Max duty-cycle < 1% Limited input range High-side drive Volt-second balance of transformer Center-tapped secondary Moderate to High Full Bridge >4 W Resonant switching can improve efficiency Power switch = Coupled inductor Very high output power Max duty-cycle < 1% Efficient transformer design 4-power switches Top FET drive Volt-second balance High Moral of the Story: The more components that you have to share the load, The more power your converter can provide. Texas Instruments - 216/17 Power Supply Design Seminar
32 Topology Design Aides Power Supply Topologies Chart Power Stage Designer Texas Instruments - 216/17 Power Supply Design Seminar 31
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