| 摘要 |
<p>PURPOSE:To suppress the increment of voltage to be impressed to a capacitor to its minimum even when one resistor is damaged and to secure the safeness of a power supply circuit by connecting respective constant voltage diodes in parallel with respective resistors constituting a voltage dividing circuit. CONSTITUTION:The voltage dividing circuit 11 is formed by connecting five resistors R1 to R5 in series, the resistors R1, R2, R4, R5 have the same resistance R and the resistor R3 has a different 1 resistance value (n-4)R. When voltages V0, V5 are respectively impressed to both the terminals of the circuit, i.e., the upper part of the resistor R1 and the lower part of the resistor R5 in the shown circuit diagram, respective voltages V1 to V4 are dividedly generated between resistors R1 and R2, R2 and R3, R3 and R4, and R4 and R5. Constant voltage diodes 13 to 16 are connected in parallel with respective resistors R1, R2, R4, R5 so as to be reversely biased and have a Zener voltage slightly higher than the V.</p> |
