| 摘要 |
PROBLEM TO BE SOLVED: To provide an analog isolation circuit in which an analog signal can be insulated by a simple circuit using general components. SOLUTION: Circuits of power supply systems of different ground systems are connected using capacitor coupling. Pulse width modulation (PWM) is performed upon an analog signal of a primary power supply system using two comparators and a triangular wave. A pulse-width-modulated wave is transported to the circuit of the secondary power supply system via a coupling capacitor. The signal is demodulated using the comparators and a low-pass filter thereafter, and the analog signal of the primary power supply system is reproduced. COPYRIGHT: (C)2007,JPO&INPIT
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