| 摘要 |
PROBLEM TO BE SOLVED: To accomplish equalization of voltage allocated to DC-DC converters without individually adjusting the voltage reference value of each of the DC-DC converters. SOLUTION: Each of DC-DC converters 111-11n individually converts input direct-current voltage VIN to alternating-current voltage through the on/off control of an inverter A1. The alternating-current voltage is multiplied by a transformer A2, and then converted through a filter A3 into direct-current voltage, which is then output. In addition, the primary current of the transformer A2 is detected by means of a current detector A4, and the inverter A1 is PWP- controlled through a control circuit A5 based on the detected current. The output voltages of the converters 111-11n are added up though diodes 121-12n to obtain a required voltage VOUT. Their output currents are detected by the current detector A4, and error voltages relative to a reference voltage are found from the detected voltages using an error amplifier 15. Thus the inverter A1 for each of the DC-DC converters 111-11n is PWM-controlled in common. |
