一、变阻二极管的变阻应用是用来对某些电路起过压保护作用的。某些特殊二极管在受到瞬时高能冲击时(如雷击或过压等),能以极高的速度改变其阻抗,由高阻变为低阻,从而吸收一个极大的电压,将管子两端的电压钳制在一个预定的数值上,这个时间很短。对电路起到了过压保护的作用。它广泛应用于计算机、电子仪表、彩电等整机电路中。 First, the varistor diode varistor application is used to protect some circuits from over-voltage protection. Some special diodes in the instantaneous high-energy impact (such as lightning or over-voltage, etc.), can change its impedance at a very high speed, from high resistance to low resistance, which absorb a great voltage, the voltage across the tube Clamped at a predetermined value, this time is short. Overvoltage protection circuit has played a role. It is widely used in computers, electronic instruments, color TV and other 整机 circuit.