Remote power supply for repeaters

Claim 2

A remote power supply system for plurality of repeaters distributed over different points of a transmission line, comprising a direct voltage generator at one end of said line, power supply units for said repeaters connected at said points in parallel with said transmission line, each of said power supply units including a d-c to d-c converter having a capacitor for providing voltages to an assigned repeater by charging said capacitor from the voltage of said direct voltage generator for a fixed period of time and then discharging said capacitor for a variable period of time, said variable period of time being determined by the variation of the output voltage of said d-c converter from a reference voltage to provide an efficient constant voltage to said repeater that is equal to the voltages supplied to other repeaters even though the voltage from said voltage generator at the different points of said transmission lines varies.

Claim 3

A remote power supply system for plurality of repeaters distributed over different points of a transmission line, comprising a direct voltage generator at one end of said line, power supply units for said repeaters connected at said points in parallel with said transmission line, each of said power supply units including a d-c to d-c converter for providing voltages to an assigned repeater by charging a capacitor from the voltage of said direct voltage generator for a fixed period of time and then discharging said capacitor for a variable period of time, said variable period of time being determined by the variation of the output voltage of said d-c converter from a reference voltage To provide an efficient constant voltage to said repeater that is equal to the voltages supplied to other repeaters even though the voltage from said voltage generator at the different points of said transmission lines varies, said d-c to d-c converter including a voltage input terminal for receiving a varying d-c voltage from said direct voltage generator, a storage capacitor for charging by the voltage at said voltage input terminal, means for periodically charging and discharging said storage capacitor, said charging and discharging means including semiconductor switching device coupled to said voltage input terminal for interrupting the charging of said storage capacitor, control means coupled to said semiconductor switching means for closing said semiconductor switch for a fixed period of time and opening same for a variable period of time in response to variations in the voltage across said storage capacitor relative to a fixed voltage reference, an inductor coupled to said semiconductor switching means for slowing down the rate of charging of said storage capacitor, diode means coupled across said inductor and said storage capacitor to provide means for discharging said storage capacitor when said semiconductor switching means are opened, and a voltage terminal connected in parallel with said storage capacitor for providing a constant voltage output from said d-c to d-c converter.

Claim 4

A remote power supply system for plurality of repeaters distributed over different points of a transmission line, comprising a direct voltage generator at one end of said line, power supply units for said repeaters connected at said points in parallel with said transmission line, each of said power supply units including a d-c to d-c converter for providing voltages to an assigned repeater by charging a capacitor from the voltage of said direct voltage generator for a fixed period of time and then discharging said capacitor for a variable period of time, said variable period of time being determined by the variation of the output voltage of said d-c converter from a reference voltage To provide an efficient constant voltage to said repeater that is equal to the voltages supplied to other repeaters even though the voltage from said voltage generator at the different points of said transmission lines varies, said d-c to d-c converter including a voltage input terminal for receiving a varying d-c voltage from said direct voltage generator, a storage capacitor for charging by the voltage at said voltage input terminal, means for periodically charging and discharging said storage capacitor, said charging and discharging means including semiconductor switching device coupled to said voltage input terminal for interrupting the charging of said storage capacitor, control means coupled to said semiconductor switching means for closing said semiconductor switch for a fixed period of time and opening same for a variable period of time in response to variations in the voltage across said storage capacitor relative to a fixed voltage reference, an inductor coupled to said semiconductor switching means for slowing down the rate of charging of said storage capacitor, diode means coupled across said inductor and said storage capacitor to provide means for discharging said storage capacitor when said semiconductor switching means are opened, and a voltage terminal connected in parallel with said storage capacitor for providing a constant voltage output from said d-c to d-c converter.

Claim 5

A remote power supply system as claimed in claim 2, wherein said control means coupled to said semiconductor switching means comprises a differential amplifier coupled to said constant voltage to said repeater for providing an output signal representing the difference between said constant voltage to said repeater and a reference voltage, an integrating circuit coupled to said differential amplifier having a time constant such that the time required for building up the output voltage is long relative to the time required for the building up of the input voltage to said storage capacitor, a bistable multivibrator having one switching time fixed and the other having a switching time determined by said integrating circuit, an amplifying means coupled to said multivibrator and adapted to control said semiconductor switching means.

Claim 6

A remote power supply system as claimed in claim 2, wherein each of the supply units for the repeaters further comprises an auxiliary supply coupled to the supply line when every system is initially put into operation, said auxiliary supply being connected between the input terminals of the power supply unit and the supply line of said control means for said semiconductor switching means, said control means being automatically connected to the output terminals of the power supply unit when the output voltage of said supply unit reaches a nominal value.