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有许多电子产品需要多路输出电源,例如盒式录象机、VCD、DVD等音像产品。普通的线性电源体积大、笨重,而且效率低,更重要的是允许的输入电压范围较窄。在国内,交流电网电压的波动很大,会影响线性电源的输出,从而缩短电子产品的寿命,所以,要求电源在电网电压波动较大的情况下仍能可靠地工作。开关式电源可以满足这个要求,因而在音像产品中的应用日见增多。
There are many electronic products require multiple output power, such as video cassette recorders, VCD, DVD and other audio and video products. Ordinary linear power supply is bulky, bulky, and inefficient, and more importantly allows a narrower input voltage range. In China, the AC grid voltage fluctuations, will affect the output of linear power supply, thereby shortening the life of electronic products, so the power requirements of the grid voltage fluctuations in the case of large can still work reliably. Switching power supply to meet this requirement, and thus the increasing use of audio-visual products.