LTC4060 - NiMH/NiCd BATTERY CHARGER CIRCUIT SCHEMATIC DIAGRAM

LTC4060 - NiMH/NiCd BATTERY CHARGER CIRCUIT SCHEMATIC DIAGRAM

Linear Technology Corporation introduces the LTC4060, an autonomous 1- to 4-cell, 0.4A to 2A linear NiMH and NiCd battery charger. The LTC4060 includes all the functions required for a battery charger circuit. The design is simple and needs only three passive components. The LTC4060 also eliminates the need for a sense resistor and blocking diode, which increases efficiency and lowers the solution cost. This IC is targeted at applications including portable medical equipment, automotive diagnostic systems and industrial/telecom test devices.

•     Complete Fast Charger Controller for Single, 2-, 3- or 4-Series Cell NiMH/NiCd Batteries
•     No Firmware or Microcontroller Required
•     Termination by –?V, Maximum Voltage or Maximum Time
•     No Sense Resistor or Blocking Diode Required
•     Automatic Recharge Keeps Batteries Charged
•     Programmable Fast Charge Current: 0.4A to 2A
•     Accurate Charge Current: ±5% at 2A
•     Fast Charge Current Programmable Beyond 2A with External Sense Resistor
•     Automatic Detection of Battery
•     Precharge for Heavily Discharged Batteries
•     Optional Temperature Qualified Charging
•     Charge and AC Present Status Outputs Can Drive LED
•     Automatic Sleep Mode with Input Supply Removal
•     Negligible Battery Drain in Sleep Mode: <>
•     Manual Shutdown
•     Input Supply Range: 4.5V to 10V
•     Available in 16-Lead DFN and TSSOP Packages

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MOBILE PHONE BATTERY CHARGER CIRCUIT DIAGRAM

MOBILE PHONE BATTERY CHARGER CIRCUIT DIAGRAM

The 220V AC mains supply is downconverted to 9V AC by transformer X1. The transformer output is rectified by diodes D1 through D4 wired in bridge configuration and the positive DC supply is directly connected to the charger’s output contact, while the negative terminal is connected through current limiting resistor R2. LED2 works as a power indicator with resistor R1 serving as the current limiter and LED3 indicates the charging status. During the charging period, about 3 volts drop occurs across resistor R2, which turns on LED3 through resistor R3. An external 12V DC supply sourcecan also be used to energise the charger, where resistor R4, after polarity protection diode D5, limits the input current to a safe value. The 3-terminal positive voltage regulator LM7806 (IC1) provides a constant voltage output of 7.8V DC since LED1 connected between the common terminal (pin 2) and ground rail of IC1 raises the output voltage to 7.8V DC. LED1 also serves as a power indicator for the external DC supply. After constructing the circuit on a veroboard, enclose it in a suitable cabinet. A small heat sink is recommended for IC1.

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NEON EMERGENCY LIGHT BATTERY SCHEMATIC DIAGRAM

Neon Emergency Light Battery 6 volt

This circuit is IC controlled emergency light. This series of automatic switching-on of the light on mains failure and battery charger with overcharge protection. When mains is absent, the relay RL2 is in deenergised state, feeding battery supply to the inverter section via its N / C contacts and switch S1.

The inverter section comprises IC2 (NE555) which is used in a stable fashion to produce sharp pulses at the rate of 50 Hz for driving the MOSFETs. The output of IC3 is fed to the gate of MOSFET (T4) directly while it is applied to MOSFET (T3) after inversion by gate transistor T2. Thus the power amplifier built around MOSFETs T3 and T4 functions in push-pull mode. The output across the secondary of transformer X2 can easily drive a 230-volt, 20-watt fluorescent tube. In case light is not required to be on during mains failure, simply flip the switch S1 to off position. Battery overcharge preventer circuit is built around IC1 (LM308). Its non-inverting pin is held at a reference voltage of approximately 6.9 volts which is obtained using diode D5 (1N4148) and 6.2-volt zener D6.

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