Bridge Converters EE-464 STATIC POWER CONVERSION-II
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EE-464 STATIC POWER CONVERSION-II Bridge Converters Ozan Keysan keysan.me Oce: C-113 • Tel: 210 7586 1 / 48
Transcript of Bridge Converters EE-464 STATIC POWER CONVERSION-II
EE-464 STATIC POWER CONVERSION-II
Bridge ConvertersOzan Keysan
keysan.me
O�ce: C-113 • Tel: 210 7586
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Full Bridge Isolating Converter
Compact solution for high power levels (>500W)
Similar to push-pull converter 2 / 48
Full Bridge Converter: Operating Modes
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Full Bridge Converter: Operating Modes
S1 & S2, S3 & S4 operate alternatively
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Full Bridge Converter: Operating Modes
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Full Bridge Converter
Same with the push-pull converter
= 2 ( )DVo VsNs
Np
D < 0.5
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Half Bridge Isolating Converter
Derived from the Buck Converter
S1, S2 turned on alternatively each for , then both o� for ton Δ 6 / 48
Half Bridge Converter: Operating Modes
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Half Bridge Converter: Operating Modes
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Half Bridge Converter
Half of the push-pull converter
= ( )DVo VsNs
Np
D < 0.5
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Current Source Converter
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Current Source ConverterVoltage Source Inverter (VSI): Fed by a voltagesource (i.e. a capacitor large enough)
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Current Source ConverterVoltage Source Inverter (VSI): Fed by a voltagesource (i.e. a capacitor large enough)
Current Source Inverter (VCI): Fed by a currentsource (i.e. an inductor large enough)
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Current Source Converter
Fed with constant source current (due to large sourceinductance)
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Current Source Converter
Same with push-pull, but the inductance moved to thesource side 12 / 48
Voltage Source Converter:Do not turn both switches ON (to prevent short-circuit)
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Voltage Source Converter:Do not turn both switches ON (to prevent short-circuit)
Current Source ConverterDo not turn both switches OFF (to prevent open-circuit)
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Current Source Converter: Operating Modes
Notice the overlapping periods between switches14 / 48
Current Source Converter: Operating Modes
Diode currents are added at the output15 / 48
Current Source Converter
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Current Source Converter
Operates as a: Boost Converter
= ( )( )Vo VsNs
Np
1
2(1 −D)
D > 0.5
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Multi-Quadrant DC Converters
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First Quadrant Converter(Type A Chopper)
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Second Quadrant Converter(Type B Chopper)
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Two Quadrant Converter(Type C Chopper)
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First and Fourth Quadrant Converter
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Full-Bridge (Four Quadrant) DC-DC Converter
Simpli�ed Circuit22 / 48
Full-Bridge (Four Quadrant) DC-DC Converter
Suitable for four quadrant operation
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Control of Full-Bridge ConverterBi-polar Voltage Switching
Uni-polar Voltage Switching
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Bi-polar Voltage Switching and are turn on and o� together
and are complimentary of and
Output can be or
TA+ TB−
TA− TB+ TA+ TB−
+Vd −Vd
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Bi-polar Voltage Switching
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Bi-polar Voltage Switching
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Bi-polar Voltage Switching
=Vo Vd
vcontrol
V̂ tri
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Uni-polar Voltage Switching and are controlled seperately
and are complimetary of and
TA+ TB+
TA− TB− TA+ TB+
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Uni-polar Voltage Switching and are controlled seperately
and are complimetary of and
Output can be or or
if and are ON
if and are ON
TA+ TB+
TA− TB− TA+ TB+
+Vd 0 −Vd
= 0Vo TA+ TB+
= 0Vo TA− TB−
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Uni-polar Voltage Switching
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Uni-polar Voltage Switching
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Uni-polar Voltage Switching
=Vo Vd
vcontrol
V̂ tri
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Uni-polar Voltage Switching
So, what's the point?
=Vo Vd
vcontrol
V̂ tri
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Ripple ComparisonHomework: Mohan Example 7.4
a) Bipolar PWM, b) Unipolar PWM33 / 48
Dead Time (Blanking Time)
O� periods are added to compensate with non-zero turn-o� time
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Dead TimeIntroduces non-linearity between Vref and Vo.
Pulses shorter than dead-time will be omitted(introduce harmonics)
Vref can be increased to compensate for the o�period.
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Full Bridge as a DC Converter
Operate it with Constant Reference Voltage
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Full Bridge as an Inverter
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Full Bridge as an Inverter
Just change the reference voltage with a sinusoid
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Full Bridge as an Inverter
Will be covered in detail in the following weeks
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PFC?
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PFC?Power Factor Correction
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PFC?Power Factor Correction
Power Factor of a 1Ph Diode Recti�er?
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PFC?Power Factor Correction
Power Factor of a 1Ph Diode Recti�er?
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Diode Recti�er
Source current
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PFC required for many applications
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PFC required for many applicationsComputer Power Supplies, LED Drives
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PFC required for many applicationsComputer Power Supplies, LED Drives
Arc Furnaces
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PFC required for many applicationsComputer Power Supplies, LED Drives
Arc Furnaces
Welding
Drawing
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PFC Circuit
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PFC Circuit
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PFC Current
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PFC Current
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PFC CurrentCritical Current Mode (Discontinuous Current Mode)
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PFC CurrentCritical Current Mode (Discontinuous Current Mode)
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PFC E�ect
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PFC E�ect
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Commercial PFC Controllers
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Commercial PFC Controllers
Toshiba-TB6819AFG
OnSemi PFC Controllers
TI PFC Controllers
TI UCC28180
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PFC Application Study: Welding Circuit
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PFC Application Study: Welding Circuit
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