Abstract
In this chapter, the Full-Bridge Zero-Voltage-Switching Pulse-Width-Modulated (FB-ZVS-PWM) dc-dc converter with inductive output filter is studied. The chapter presents and describes the principle of operation of the power converter topology, the modulation strategy and the relevant waveforms. A quantitative analysis is provided, focused on obtaining the static gain and output characteristics. Subsequently, the commutation is analyzed and the main equations necessary for designing the commutation parameters are derived. Also included are numerical examples to illustrate the theoretical analysis, proposed exercises with solutions and numerical simulations.
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Abbreviations
- Vi:
-
Input DC voltage
- Vo:
-
Output DC voltage
- Po:
-
Output power
- Co:
-
Output filter capacitor
- Lo:
-
Output filter inductor
- Ro:
-
Output load resistor
- ZVS:
-
Zero voltage switching
- ϕ:
-
Angle between the leading leg and the lagging leg
- q:
-
Static gain
- D:
-
Duty cycle
- Def:
-
Effective duty cycle
- fs:
-
Switching frequency
- Ts:
-
Switching period
- td:
-
Dead time
- n:
-
Transformer turns ratio
- \( {\text{I}}^{\prime}_{\text{o}} \) :
-
Output DC current referred to the transformer primary side
- \( {\text{v}}^{\prime}_{\text{o}} ({\text{V}}^{\prime}_{\text{o}} ) \) :
-
Output voltage referred to the transformer primary side and its average value
- io:
-
Output current
- \( {\text{I}}^{\prime}_{\text{o}} \left( {\overline{{{\text{I}}^{\prime}_{\text{o}} }} } \right) \) :
-
Average output current referred to the transformer primary and its normalized value
- \( {\text{I}}^{\prime}_{{{\text{o}}\,{\text{crit}}}} \) :
-
Critical average output current referred to the primary side
- S1 and S3:
-
Switches in the leading leg
- S2 and S4:
-
Switches in the lagging leg
- vg1, vg2, vg3 and vg4:
-
Switches S1, S2, S3 and S4 drive signals, respectively
- D1, D2, D3 and D4:
-
Diodes in anti-parallel to the switches (MOSFET—intrinsic diodes)
- C1, C2, C3 and C4:
-
Capacitors in parallel to the switches (MOSFET—intrinsic capacitors); C = C1 = C2 = C3 = C4
- vC1, vC2, vC3 and vC4:
-
Capacitors voltage
- vC:
-
Equivalent capacitors voltage
- Lc:
-
Transformer leakage inductance or an additional inductor, if necessary
- iLc:
-
Inductor current
- ωo:
-
Resonant frequency
- z:
-
Characteristic impedance
- ∆ and β:
-
State plane angles
- vab:
-
Full bridge ac voltage, between points “a” and “b”
- vcb:
-
Inductor voltage, between points “c” and “b”
- vac:
-
Voltage at the ac side of the rectifier, between points “a” and “c”
- vS1, vS2, vS3 and vS4:
-
Voltage across switches
- iS1, iS2, iS3 and iS4:
-
Current in the switches
- iD1, iD2, iD3 and iD4:
-
Current in the diodes
- iC1, iC2, iC3 and iC4:
-
Current in the capacitors
- ∆T:
-
Time interval which vab = ±Vi
- ∆t1:
-
Time interval of the first step of operation in CCM
- ∆t2:
-
Time interval of the second step of operation in CCM
- ∆t3:
-
Time interval of the third step of operation in CCM
- ∆t4:
-
Time interval of the fourth step of operation in CCM
- ∆t5:
-
Time interval of the fifth step of operation in CCM
- ∆t6:
-
Time interval of the six step of operation in CCM
- ∆t7:
-
Time interval of the seventh step of operation in CCM
- ∆t8:
-
Time interval of the eighth step of operation in CCM
- IS13 RMS \( \left( {\overline{{{\text{I}}_{{{\text{S}}13\,{\text{RMS}}}} }} } \right) \):
-
Switches S1 and S3 RMS current and its normalized value
- IS24 RMS \( \left( {\overline{{{\text{I}}_{{{\text{S}}24\,{\text{RMS}}}} }} } \right) \):
-
Switches S2 and S4 RMS current in CCM and its normalized value
- ID13 \( \left( {\overline{{{\text{I}}_{{{\text{D}}13}} }} } \right) \):
-
Diodes D1 and D3 average current and its normalized value
- ID24 \( \left( {\overline{{{\text{I}}_{{{\text{D}}24}} }} } \right) \):
-
Diodes D2 and D4 average current and its normalized value
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Barbi, I., Pöttker, F. (2019). Full-Bridge ZVS-PWM Converter with Inductive Output Filter. In: Soft Commutation Isolated DC-DC Converters. Power Systems. Springer, Cham. https://doi.org/10.1007/978-3-319-96178-1_8
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DOI: https://doi.org/10.1007/978-3-319-96178-1_8
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