负载阻抗特性对引信磁共振耦合无线装定系统传输特性影响

The load impedance characteristics of receiver have an important influence on the power transmission performance of fuze setting system. For this problem, a circuit model of a magnetic resonance coupling wireless setting system under condition of non-pure resistance load is established. The influence rules of load impedance characteristics on the transmission performance of the system are analyzed theoretically and experimentally. The result shows that the capacitive or inductive component of the load causes the resonant frequency to be offset and affects the transmission performance adversely. The basic reason is that the load impedance results in the variation of equivalent capacitance or inductance in the relay circuit through coupling mapping. When the impedance angle of load is less than zero, the resonant frequency is shifted downward and decreased. With the increase in impedance angle, the frequency offset and its influence on the transmission performance are gradually diminished. This influence can be ignored when the capacitance increases to a certain value. When the impedance angle is greater than zero, the resonant frequency offset is opposite. With the increase in inductance value, the negative influence is becoming more and more serious, which will eventually destroy the resonant coupling state of the system, causing the failure of setting. The proposed model is proved to be correct, and the theoretical result is consistent with the experimental result.