An improved low voltage disconnect (ILVD)

Cosentino, Aldo; Sullivan, M.; Lutz, L.; Click, B.

doi:10.1109/intlec.1997.646063

Cited by 3 publications

(1 citation statement)

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“…Other, low cost LVD devices use normally open contactors which are driven closed directly from the system voltage. In some cases series economy resistors are used to reduce the solenoid holding current [2]. Both result in poor efficiency, limit the device to only one system voltage, incorporate large power components and can subject the contactor coil andor shunt resistor to continuous thermal stress, hence reducing the device's expected life and reliability.…”

Section: Introductionmentioning

confidence: 99%

Design considerations for a PWM controlled low voltage disconnect (LVDC)

Walcott¹

INTELEC - Twentieth International Telecommunications Energy Conference (Cat. No.98CH36263)

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Valve Regulated Lead Acid (VRLA) batteries have been used in telecommunication power systems for over a decade and with them has followed demands on the handling of batteries at low voltages. Devices connected in series to the system are often incorporated to disconnect the batteries from the load in the event of a near deep discharge. This paper covers the design considerations for one such device that improves reliability through the use of Pulse Width Modulation (PWM) techniques. By choosing a low voltage contactor and regulated PWM input, a voltage range covering both 24V and 48V systems can be achieved that greatly improves efficiency and reduces thermal stress, hence reducing the size of critical components. Detailed analysis of the total system reliability and EMC issues are also presented.

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Section: Introductionmentioning

confidence: 99%