Digital Control Application in Half-Bridge Converter
2012
Hochschulschrift
Zugriff:
100
In this thesis, a backup power converter with wide-range input voltage from 40 to 75 Vdc and output voltage 48 Vdc is required in telecommunication system application. Therefore, a step-up/step-down voltage gain and non-pulsating input current is requested. Among the available topologies, the buck-boost derived converters are suitable for this applications. However, there is a pulsating input current waveform of the Buck-Boost derived converters. The pulsating input current ripple generates di/dt noise and is not suitable for the battery based backup power system. Therefore, a larger filter is needed to meet the EMI regulation and extend the battery life. On the other hand, both derived converters have moving pole characteristic inherited from the Boost converter resulting in hard realizing the controller with PWM voltage-mode control. Therefore, the Half-Bridge Converter with Input Current Ripple Reduction (HBC-CRR) is employed to obtain the required voltage gain, reduced input current ripple, and a controller with the simple voltage mode. Although the required voltage gain and a continuous input current can be achieved, the control of this topology has not been explored yet. It becomes the research topic of this thesis. The analog control of HBC-CRR will be designed and implemented. Moreover, the obtained transfer function will be converted into the difference equation for the design of the digital control. Thus, digital control will be implemented by using TI TMS320F28027 Digital Signal Processors (DSPs). In addition to the theory, several main features and development tools for DSPs are introduced. Moreover, the experimental results of both analog and digital controllers for a Half-Bridge Converter with Current Ripple Reduction (HBC-CRR) power converter are presented and compared.
Titel: |
Digital Control Application in Half-Bridge Converter
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Autor/in / Beteiligte Person: | Hsu, Wun-Jheng ; 許文政 |
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Veröffentlichung: | 2012 |
Medientyp: | Hochschulschrift |
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