| 摘要 |
PURPOSE:To recover unbalanced output voltage quickly by comparing output voltages from DC power supplies connected in parallel with a reference voltage thereby preventing output voltage drop and connecting respective load share circuits. CONSTITUTION:Outputs from DC power supplies PSI and PSII incorporating DC/DC converters 10 are connected in parallel. An error amplifier circuit 20 for comparing the output voltages from the power supplies PSI, II with a reference voltage and reducing the error, and a circuit 40 for preventing output voltage drop are provided. A load share circuit 60 is arranged between the error amplifier circuit 20 and a PWM control circuit 30, then the power supplies PSI, II are connected through a load share line. The PWM circuit 30 is normally controlled by the output from the error amplifier 20, but when output voltage from one power supply drops the load is born by the other power supply circuit 40, and the voltage is set lower than the set voltage of the error amplifier 20 thus making control of the PWM circuit 30. By such arrangement, load is balanced quickly between both power supplies and the output voltage is stabilized. |
