通常反向电压保护方法是使用二极管,防止损坏电路。一个方案是用串联二极管,只允许电流向正确的极性流动(图1)。另外还可以用二极管桥对输入做整流,这样电路就永远有正确的极性(图2)。这些方案的缺点是,二极管上的压降会消耗能量。输入电流为1A时,图1中的电路功耗为0.7W,图2中电路的功耗为1.4W。本例提出了一种简单方法,它 Reverse voltage protection is usually the use of diodes to prevent damage to the circuit. One solution is to use a series diode that allows only the current to flow to the correct polarity (Figure 1). You can also use the diode bridge rectifier input, so that the circuit will always have the correct polarity (Figure 2). The disadvantage of these solutions is that the voltage drop across the diode can consume energy. When the input current is 1A, the power consumption of the circuit in Figure 1 is 0.7W, and the power consumption of the circuit in Figure 2 is 1.4W. This example presents a simple method, it