| 摘要 |
PURPOSE:To attain an insulating type adding circuit having a simple circuit constitution at low cost by using a fine signal isolator. CONSTITUTION:A pulse transformer 4 is constituted of the 1st and 2nd primary windings L2, L3, a secondary winding L4 and a ternary winding L1. The winding L2 is connected to the 1st non-linear circuit D5 to constitute the 1st input circuit 5 and the winding L3 is connected to the 2nd non-linear circuit D6 to constitute the 2nd input circuit 6. The Winding L4 is connected to the 3rd non-linear circuit D7 and an averaging circuit is connected to both the ends of a serial connectin part to constitute an output circuit 7. A current source 81 for generating impulse currents with positive and negative polarity is connected to the winding L1 to constitute an exciting circuit 8. In the circuit having the constitution, the current source 81 alternately generates a positive polarity impulse current and a negative polarity impulse current to alternately induce an input voltage in the 1st and 2nd primary windings L2, L4. The induced input voltage is transmitted to the output circuit 7 through the winding L4. In the output circuit 7, the transmitted input voltage is averaged by the averaging means and voltage consisting of (the added voltage of input voltages to the two input circuits 5, 6)/2 is outputted. Consequently the adding circuit for 1/2 gain can be attained. |
