使用反相稳压器的降压/升压直流到直流电压转换

　　使用反相稳压器的降压/升压直流到直流电压转换

　　降压（降压）开关电压转换器（或稳压器）是受欢迎的电池供电产品，因为它们是有效的电压和负载范围广泛，相对简单。然而，当电池电压低于所需的输出下降，稳压器停止运行。这可能是便携式设计中的一个缺点，因为经常有一些未使用的能力，在电池中留下的电源“辍学”，否则可能已被用来延长运行时间。

　　针对未使用的电池容量的一个流行的解决方案是降压/升压（“降压/升压”）开关稳压器或其他拓扑结构，如单端初级电感转换器（SEPIC）。（见高新区第“SEPIC选项为电池电源管理”。）这类电源自动切换到升压配置一旦电池输出低于所需的电源输出；但降压/升压设备比较昂贵，电路比较复杂，和电源需要更大的电路板空间。

　　However， there is a lesser-known option for a switching power supply which maximizes battery capacity in a portable product yet is simple and inexpensive： the switching inverting regulator. These are usually employed to convert a positive input voltage to a （lower） negative output， but can also be used to convert a varying positive input to a lower or higher negative output.

　　This article describes the function of a switching inverting regulator and its application and then leads on to describe a topology that uses the device to regulate a varying input voltage as an alternative to a conventional buck/boost regulator.

　　Anatomy of an inverting regulator

　　Figure 1 shows a simplified schematic of a switching inverting regulator. The regulator comprises a pulse width modulation （PWM） controller driving a metal oxide semiconductor field effect transistor （MOSFET） connected to an inductor. The inductor acts as an energy reservoir providing power when the storage MOSFET switches off.