Filter capacitor charging circuit

Details Filter capacitor charging circuit Filter capacitor charging circuit

1975-12-10

1977-06-21

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

By regulating source or load

320 1, 361 86, H02H 904

Patent

active

040315592

ABSTRACT:
A circuit is disclosed for charging an input filter capacitance from a source of potential before a protective circuit, e.g., a fuse, is established between the source of potential and the capacitance. If the charging circuit is connected between the potential source and the substantially discharged capacitance, a small charging current will flow through a current limiting resistance. This small current will partially charge the capacitance if no faults are present. A threshold detector circuit monitors the voltage on the capacitance and for a voltage of approximately three volts or more, in the case of a twenty-four volt potential source, activates a charging transistor. The charging transistor is controlled by feedback circuitry to provide a larger but limited charging current to complete the charging to within approximately one volt of the potential of the source of potential.

REFERENCES:
patent: 3412208 (1968-11-01), Jacob
patent: 3549851 (1970-12-01), Hockenberry et al.
patent: 3555361 (1971-01-01), Hallberg
patent: 3748534 (1973-07-01), Jones
patent: 3935511 (1976-01-01), Boulanger et al.
patent: 3935527 (1976-01-01), Michelet et al.

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