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家电产品运行中所需要的电源通常有:220V(用于电动机、电热管等大功率高电压元件的供电)、12V(用于继电器、蜂鸣器、电磁阀等的供电)、5V(用于逻辑电路、微处理器电路的供电)。传统使用的78、79系列线性稳压器(配合变压器)由于转换效率低(30~40%)、发热量大,已逐渐被对能耗要求较高的家电产品市场所淘汰。开关电源产品以其高效率(80%以上)、小体积、低散热、输入电压范围广等优点得到了广泛地应用。国际知名IC厂商也纷纷推出开关电源系列产品,如:MAXIM、ONSEMI、PI等。本期特为读者介绍PI(Power Integrations)公司开关电源产品在家电产品上的应用实例及选型指南。
Power supply for the operation of household electrical appliances is usually 220V (for power supply of high-power high-voltage components such as motor and heater), 12V (power supply for relay, buzzer and solenoid valve), 5V Logic circuit, microprocessor circuit power supply). Traditionally used 78,79 series linear regulator (with transformer) due to the low conversion efficiency (30 ~ 40%), heat, has been gradually higher energy consumption of home appliances market eliminated. Switching power supply products with its high efficiency (more than 80%), small size, low heat dissipation, wide input voltage range has been widely used. Internationally renowned IC manufacturers have also introduced switching power supply products, such as: MAXIM, ONSEMI, PI and so on. This issue is specifically for readers to introduce PI (Power Integrations) company’s switching power supply products in the appliance examples and Selection Guide.