采用频率自动跟踪技术来解决信号丢失问题，抑制了各种噪声和干扰。

It tracks the frequency automatically to resolve the dropout of signal and to restrain all kinds of noises and disturbances.

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样机运行结果表明，控制系统能随外部干扰和负载变化自动跟踪谐振频率，并有可靠性好，电路简单，抗干扰能力强的特点。

The prototype operation indicate that control system can automatically adapts the drift of parameters with the new wethod. It has such character as high reliable, simple circuit and good anti-jamming.

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