| 摘要 |
PURPOSE:To hold output impedance at a prescribed value and to reduce loss due to a load charging resistor by using the load charging resistor having a large resistance value. CONSTITUTION:The 2nd winding having the number N2 of times of winding is connected to the load side of the 1st winding as a current detecting winding of a current detector 2'. The current detector 2' inputs an output voltage VD proportional to the sum of ampere turns of the two windings to a control circuit 3, which compares the input voltage VD with a reference voltage E and controls a constant current source 4 so that VD=E is formed. When the sum of ampere turns of the 1st and 2nd windings, i.e. I1'N1+I2N2, is set on the lateral axis and I1' is defined as I1 at I2=0, the formula I is formed and therefore the formula IIis also formed. Since Rp'<Rp is formed, its characteristics is a straight line (f). The resistance value Rp of the load charging resistor 5 can be set to a high value to obtain the characteristic shown by a straight line (e), so that loss due to the load charging resistor 5 can be reduced. |
