H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 19/00 (2006.01)
Patent
CA 2070785
A B S R A C T The present invention relates to a method and an arrangement for supplying direct current to a telephone line (ab). According to the invention, the current supply characteristic is programmable. The arrangement comprises a direct current supply circuit which detects the line voltage (Uab) and supplies a line current (Iab) in accordance with a preprogrammed current supply characteristic. The circuit includes a first more high-voltage part (1) and a second more low-voltage part (2), in which programming of the- current supply characteristic takes place. For the purpose of achieving programming, a first resistive component (RA) having a programmable resistance is arranged essentially parallel with a capacitor (C1) in the second part (2). The first resistive component determines the supply resistance of the circuit for low line currents. For the purpose of programming the characteristic, the circuit also includes a voltage limiting element (7) having a programmable reference voltage connected in series with a second resistive component (RB) having a programmable resistance, which are arranged substantially in parallel with the capacitor (C1). The reference voltage determines a limit line current (Ilim) at which current limitation occurs and the second resistive component (RB) determines, together with the first resistive component (RA) the supply resistance of the circuit at current limitation. Finally, the polarity of the idling voltage (E) of the circuit is also programmable.
Lindberg Claes Johan Anders
Lofmark Bengt Gustav
Oredsson Jan Ored Hakan
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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