Half wave mode synchronous wave-detection circuit

Published:2011/8/23 22:25:00 Author: | Keyword: Half wave mode, synchronous, wave-detection | From:SeekIC

The Half wave mode synchronous wave-detection circuit is as shown in the figure. This is the basic mode of the synchronous wave-detection, the output voltage U=Umcosφ, and we can get the signal amplitude of Um and phase position φ. The A1 is the buffer amplifier, the output impedance is very low. C1 is the stopping condenser, it can prevent the imbalance of A1 or the drifting to affect the performance of the circuit. A2 is the zero-cross comparator, it need to use the fast conversion speed op amp, or there will be the phase delay. The switching circuit is composed of the VT1 and VT2. The transformer T1 can make the switching signal in the floating ground state. The R1 can be used to adjust the amplitude of the switch driving signal.



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