低失真教學用三相電源研究:在大學教學過程中，三相電源的配置往往難以滿足教學需要并有其局限性。而常用的變頻器因其諧波和造價等因素也不適合作為一般電學實驗的電源。為此，通過文氏電橋、移相電路、功率放大器等組成的400Hz 三相電源裝置較好地解決了實驗用三相電源的問題。運行表明，該裝置取得了滿意的效果。
關鍵詞：三相電源；低失真；低諧波

Abstract: In the university teaching, the three -phase power supply can憶t meet the teachings needs and has its limitation. The transducter is not appriciate to the general electricity experiment power source as well, for its harmonic and cost factor. So the 400Hz three-phase power supply device which is make up of Wien憶s bridge, shift phase circuit and power amplifier etc. can solve the experimental convention three-phase power source's question. The movement
indicated that this equipment has obtained the satisfactory effect.
Keywords: three-phase power supply; low distortion; low harmonic