Digital PWM for Multi-Level Flying Capacitor Converters with Improved Output Resolution and Flying Capacitor Voltage Controller Stability
| Autor: | Aleksandar Prodic, Samuel da Silva Carvalho, Michael Halamicek, Nenad Vukadinovic |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Buck converter Computer science 020208 electrical & electronic engineering 02 engineering and technology Sawtooth wave Converters 01 natural sciences 500 kHz law.invention Capacitor law Control theory Voltage controller 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Trailing edge Pulse-width modulation |
| Zdroj: | 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics (COMPEL). |
| DOI: | 10.1109/compel.2018.8460163 |
| Popis: | This paper presents a flying capacitor voltage stability analysis comparing Trailing Edge (sawtooth counter) and Dual Edge (triangular counter) Digital Pulse-Width Modulation (DPWM) schemes when used on Multi-Level Flying Capacitor (ML-FC) converters, and shows that dual edge DPWM provides better stability for the flying capacitor voltage. Moreover, it presents a new, sawtooth counter based, Emulated Dual Edge DPWM scheme, that provides the same stability advantage and at the same time also has better digital pulse-width resolution than a typical triangular counter based Dual Edge DPWM. The introduced Emulated Dual Edge DPWM scheme allows the use of a simple linear compensator control scheme for the flying capacitor voltage of ML-FC converters, for the full range of operation, solving feedback instability issues that would arise with the use of trailing edge DPWM under light load operation. The introduced Emulated Dual Edge DPWM scheme was verified on a 20 W, 500 kHz, 12V-to-5V, Three-Level Flying Capacitor (3L-FC) buck converter, showing the stability of the flying capacitor control loop under light load operation and improved resolution, demonstrating its superiority over both the Trailing Edge and Dual Edge DPWM. |
| Databáze: | OpenAIRE |
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