Design and simulation of an adjustable high voltage DC-DC converter
A Flyback DC-DC converter capable of boosting an input voltage of 5V to an output voltage ranging from 30-300V with a 5mA load is presented. The output voltage is also customised to be electronically tunable, with a user-defined input. Due to the space constraints involved, the Flyback transforme...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
2017
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/70970 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | A Flyback DC-DC converter capable of boosting an input voltage of 5V to an output
voltage ranging from 30-300V with a 5mA load is presented. The output voltage is
also customised to be electronically tunable, with a user-defined input. Due to the
space constraints involved, the Flyback transformer utilised in this project is small,
with a primary-secondary inductance ratio of 20µH : 2mH. The off-chip capacitance is
also kept to a minimal value of 220nF. Due to the small inductance value, the Flyback
converter operates in the discontinuous conduction mode. The Flyback converter uses
the current-mode control, which serves to provide some form of voltage-feedforward (on
top of the conventional voltage-feedback) in anticipation of sudden line changes thus
providing excellent dynamic response. The on-chip current-mode controller is being
implemented in CSM130nm technology. An efficiency of 90% is achieved under the
most ideal conditions where the coupling coefficient between the primary and secondary
coil, M, is unity. An efficiency of 70% is achieved when M is 0.87. |
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