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Thiết kế nguồn, mạch xạc pin

Tài liệu tham khảo Thiết kế nguồn, mạch xạc pin bằng tiếng Anh | Contents Introduction viii 1 Battery Chargers and Zappers 1 2 Power Supplies Fixed 23 3 Power Supplies High Voltage 84 4 Power Supplies Variable 101 5 Power Supply Monitors 112 6 Power Supply Protection Circuits 179 Sources 725 Index 729 Battery Chargers and Zappers The sources of the following circuits are contained in the Sources section which begins on page 125. The figure number in the box of each circuit correlates to the source entry in the Sources section. Lead-Acid Battery Charger 12-V Battery Charger 200-mA-hour 12-V NiCad Battery Charger NiCad Charger with Current and Voltage Limiting 14-V 4-A Battery Charger Power Supply Fast Charger for NiCad Batteries Current-Limited 6-V Charger NiCad Charger Simple NiCad Battery Zapper Battery Charger Automatic Shutoff Battery Charger Battery-Charging Regulator 12-V Battery-Charger Control 20 rms Max. Battery Charger Universal Battery Charger Lead-Acid Low-Battery Detector Universal Battery Charger UJT Battery Charger Automotive Charger for NiCad Battery Packs Constant-Voltage Current-Limited Charger Versatile Battery Charger Gel-Cell Charger NiCad Battery Zapper PUT Battery Charger Thermally Controlled NiCad Charger NiCad Battery Zapper II Portable NiCad Battery Charger Lithium Battery Charger Rapid Battery Charger for Icom IC-2A Battery Charger Operates on Single Solar Cell Wind-Powered Battery Charger 1 LEAD-ACID BATTERY CHARGER LEAD-ACID Q BATTERY VOUT EDN Fig. 7-7 This circuit furnishes an initial voltage of 2.5 V per cell at 25 C to rapidly charge a battery. The charging current decreases as the battery charges and when the current drops to 180 mA the charging circuit reduces the output voltage to 2.35 V per cell leaving the battery in a fully charged state. This lower voltage prevents the battery from overcharging which would shorten its life. The LM301A compares the voltage drop across R1 with an 18 mV reference set by R2. The comparator s output controls the voltage regulator forcing it to produce the lower .