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本文介绍的相敏整流电路是已鉴定的智能化多参数电机机壳测试仪中前向通道的部分电路。该测试仪对前向通道电路的零位输出残压、线性度、对称度及长时间稳定度等指标要求很高。早期采用变压器、二极管、三极管相敏整流电路,其一,需要变压器,体积大且制作、调试不便:其二,二极管、三极管的非线性特性,以及饱和压降和反向漏电流大,因而不能满足设计要求。航天工业部691厂试产的LZX系列单片集成相敏整流电路,省掉了变压器,具有重量轻、体积小、可靠性高等优点,但由于目前处于试产阶段,性能还不尽人意。我们对4片LZX系列半波、全波相敏整流电路,进行多次实验后发现;它的输出电压噪声大;正、负半周波形难调对称;特别是其时漂太大,即输出电压长时间稳定度达不到课题的设计要求。鉴于上述情况,我们选用低漂移、低噪声运放OP07CH和OP09CH组成高精度、低漂移集成运放相敏整流电路。其电路如图1所示。
This article describes the phase-sensitive rectifier circuit is identified in the intelligent multi-parameter motor casing tester part of the forward channel circuit. The tester on the front channel circuit zero output residual voltage, linearity, symmetry and long-term stability and other indicators demanding. Early use of transformers, diodes, triode phase sensitive rectifier circuit, one, the need for transformers, bulky and production, debugging inconvenience: Second, the diode, the nonlinear transistor characteristics, and saturation voltage drop and reverse leakage current, and therefore can not Meet the design requirements. 691 pilot of the Ministry of Aerospace Industry LZX Series monolithic integrated phase-sensitive rectifier circuit, eliminating the need for transformers, light weight, small size, high reliability, but due to the current trial production stage, the performance is not satisfactory. We have four LZX series of half-wave, full-wave phase-sensitive rectifier circuit, after many experiments found; its output voltage noise; positive and negative semi-circular waveform difficult to tune symmetry; especially when the drift is too large, that is, the output voltage Prolonged stability of less than the subject of the design requirements. In view of the above, we use low drift, low noise op amp OP07CH and OP09CH to form a high precision, low drift integrated op amp phase sensitive rectifier circuit. The circuit shown in Figure 1.