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Notas de Diseño

• Descargar
  Fast, High Efficiency, Standalone NiMH/NiCd Battery Charging &mdash DN380
  PDF, 92 Kb, Archivo publicado: nov 28, 2005
  Extracto del documento

  advertisement Fast, High Efficiency, Standalone NiMH/NiCd Battery Charging
  Design Note 380
  Fran Hoffart
  Introduction
  Although recent popular attention is focused on Lithium
  Ion batteries, one must not forget that other battery
  chemistries, such as Nickel Cadmium (NiCd) and Nickel
  Metal Hydride (NiMH) have advantages in rechargeable
  power systems. Nickel-based batteries are robust, capable
  of high discharge rates, have good cycle life, do not
  require special protection circuitry and are less expensive
  than Li-Ion. Among the two, NiMH batteries are rapidly
  replacing NiCd because of their higher capacity (40% to
  50% more) and the environmental concerns of the toxic
  cadmium contained in NiCd batteries. NiCd/NiMH Battery Charging Basics
  Batteries come in many sizes and capacity ratings.
  When specifying charge current, it is commonly related
  to a battery’s capacity, or simply “C”. The letter “C” is a
  term used to indicate the manufacturers’ stated battery
  discharge capacity which is measured in milliamp-hours
  (mAh). This capacity rating becomes important when
  fast charging because it determines the required charge
  current for proper charge termination. …

Artículos

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  High Efficiency Nickel Charger Operating to 34V is Easily Configured to Deliver a Safe Fast Charge &mdash LT Journal
  PDF, 262 Kb, Archivo publicado: marzo 28, 2006
  Extracto del documento

  DESIGN FEATURES L High Efficiency Nickel Charger
  Operating to 34V is Easily Configured
  to Deliver a Safe Fast Charge
  by James A. McKenzie Introduction Accurate, Rock-Solid
  Fast Charge Termination The LTC4011 implements a complete
  fast charge control algorithm, best
  suited for charge rates of C/2 to 2C 100
  95 EFFICIENCY (%) SINGLE CELL VOLTAGE (V) DCIN = 5.5V 90 DCIN = 20V 85
  80
  75
  70 1.65 36 1.60 34 1.55 32 SINGLE CELL
  VOLTAGE 1.50
  1.45 30
  28 BATTERY
  TEMPERATURE 1.40 26
  1A 1.35 65 BATTERY TEMPERATURE (В°C) The LTC4011 is a complete standalone
  nickel chemistry fast charger that operates at high efficiency with an input
  voltage of up to 34V, even with a battery
  voltage that is much less than the DC
  input supply. Typical efficiency with a
  5.5V and 20V input supply is shown
  in Figure 1. An undervoltage lockout
  of 4.25V ensures stable operation with …

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• Power Management > Battery Management > Battery Charger IC > Switching Battery Chargers