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便携式设备中有关电源管理的基本问题可归结为避免不必要的能耗以延长电池的寿命。图1所示双输出电源就能满足这种要求,而且需电池供电,或墙上交流插座电源供电,或两者都用,就能保持稳定的5V和3.3V输出。这种电路只是在交流电源断电后才起用电池供电。电池和墙上交流
The basic problem with power management in portable devices can be attributed to avoiding unnecessary energy consumption to extend battery life. The dual output power supply shown in Figure 1 meets this requirement and maintains a stable 5V and 3.3V output with battery-powered, wall-plugged AC power or both. This circuit only uses battery power when the AC power is off. Battery and wall communication