Bipolar Phase Shift Modulation Single-Stage Audio Amplifier Employing a Full Bridge Active Clamp for High Efficiency Low Distortion
| Autor: | Shu Zhong, Jianping Xu, Duo Xu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Cycloconverter
Total harmonic distortion Leakage inductance Materials science Switched-mode power supply Amplifier 020208 electrical & electronic engineering 02 engineering and technology Audio power amplifier Inductor law.invention Capacitor Control and Systems Engineering law 0202 electrical engineering electronic engineering information engineering Electronic engineering Electrical and Electronic Engineering |
| Zdroj: | IEEE Transactions on Industrial Electronics. 68:1118-1129 |
| ISSN: | 1557-9948 0278-0046 |
| Popis: | Two-stage power conversion of class-D amplifier with front-end switching mode power supply affects the power conversion efficiency of audio amplifier system. Single-stage inverter (SSI) developed from cycloconverter can be used as audio amplifier to improve efficiency. However, current commutation of cycloconverter switches challenges for high efficiency and low total harmonic distortion (THD). In this article, a bipolar phase shift modulation (BPSM) SSI is proposed for high efficiency low distortion audio amplification. Full bridge active clamp (FBAC) circuit is used to clamp the voltage across cycloconverter switches and recycle the energy of filter inductor and leakage inductance. By using active clamp, utilization of magnetizing inductance current and optimization of driving sequence of clamp switches, zero voltage switching of the proposed BPSM FBAC-SSI is achieved over wide range. With BPSM and voltage clamp across cycloconverter switches, low THD of output voltage is also achieved. A 200 kHz prototype with 250 W output power is presented to verify the analysis results of the proposed BPSM FBAC-SSI. |
| Databáze: | OpenAIRE |
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