| 摘要 |
A high voltage power supply for use in small diameter spaces such as in oil well logging devices includes an AC voltage source which provides an AC voltage to a voltage multiplier circuit that converts the AC voltage to a high DC voltage. A parallel or combination parallel-series multiplication circuit is used, rather than a series multiplication circuit, to reduce the reverse voltage across each semiconductor rectifier in the multiplication circuit. The lower reverse voltage reduces leakage currents allowing such circuits to operate at temperatures over 150 degrees C. A special construction of high voltage capacitors allows the power supply to fit small spaces. A piece of elongate conductive material, such as a metal cylinder, forms a common capacitor electrode and is coated with a high voltage dielectric. Separate individual capacitor electrodes are formed around the common electrode and dielectric. |
