| 摘要 |
PROBLEM TO BE SOLVED: To transmit two or more types of signals from a secondary side to a primary side by one photocoupler. SOLUTION: A voltage and current detector 24 detects a voltage and a current from an output terminal To1, and supplies the output to a signal synthesizer 28. A voltage detector 29 is provided between the terminal To1 and a ground, detects a voltage output from the terminal To1 and supplies the output to the synthesizer 28. The synthesizer 28 synthesizes the voltage or the current from the detector 24 and the voltage from the detector 29, and supplies its output to a signal transmitter 27. The transmitter 27 outputs a signal to a light emitting diode 3a based on the signal from a controller 26 and a signal from the synthesizer 28. The diode 3a emits a light based on the signal supplied from the transmitter 27. When the diode 3a emits the light, a phototransistor 3b is turned on, and a receiver 17 receives the signal. |
