APPLICATION NOTE IMPROVED CHARGING METHODS FOR

Texas Instruments, Incorporated

Description

Niveau: Supérieur, Doctorat, Bac+8
APPLICATION NOTE IMPROVED CHARGING METHODS FOR LEAD-ACID BATTERIES USING THE UC3906 U-104 ABSTRACT This paper describes the operation and application of the UC3906 Sealed Lead-Acid Battery Charger. This IC pro- vides reductions in the cost and design effort of implement- ing optimal charge and hold cycles for lead-acid batteries. Described are the design and operation of several charg- ing circuits using this IC. The charger designs use current and voltage sensing combined with sequenced current and voltage control to maximize battery capacity and life for various applications. The presented material provides insight into expected improvements in battery perfor- mance with respect to these specific charging methods. Also presented are uses of the many auxiliary functions included on this part. The unique combination of features on this control IC has made it practical to create charge and hold cycles that truly get the most out of a battery. AN IC FOR CHARGING LEAD-ACID BATTERIES Battery technology has come a long way in recent years. Driven by the reduction of size and power requirements of processing functions, batteries now are used to provide portability and failsafe protection to a new generation of electronic systems. Although a number of battery technol- ogies have evolved, the lead-acid cell remains the work- horse of the industry due to its combination of prolonged standby and cycle life with a high energy storage capacity.

• implement- ing optimal


• uc3906 can


• battery


• ing input


• charge rate


• acid cell


• sealed lead-acid


• current


• lead acid

Sujets

• Battery
• VRLA battery
• Current
• Lead?acid battery

Informations

• Publié par: profil-zyak-2012
• Nombre de lectures: 44
• Langue: English

Extrait

U-104

APPLICATION NOTE IMPROVED CHARGING METHODS FOR LEAD-ACID BATTERIES USING THE UC3906 ABSTRACT This paper describes the operation and application of the electronic systems. Although a number of battery technol- UC3906 Sealed Lead-Acid Battery Charger. This IC pro-  ogies have evolved, the lead-acid cell remains the work- vides reductions in the cost and design effort of implement- horse of the industry due to its combination of prolonged ing optimal charge and hold cycles for lead-acid batteries.  standby and cycle life with a high energy storage capacity. Described are the design and operation of several charg- The makers of uninterruptible power supplies, portable ing circuits using this IC. The charger designs use current equipment, and any system that requires failsafe protec- and voltage sensing combined with sequenced current tion are taking advantage of the improvements in this tech- and voltage control to maximize battery capacity and life nology to provide secondary power sources to their prod- for various applications. The presented material provides ucts, for example, the sealed cell, using a trapped or gelled insight into expected improvements in battery perfor- electrolyte, has eliminated the positional sensitivity and mance with respect to these specific charging methods.  greatly reduced the dehydration problem. Also presented are uses of the many auxiliary functions  h included on this part. The unique combination of features c T h h a e r   g c e h   a o r n g   i a n   g le   a m d e - t a h c o i d d  s b  u at s t e er d y  t   o h   a r v e e p   l a e   n s i i s g h n   if o i r c   a m n a t  i e n f t f a e in c   t t  o e n on this control IC has made it practical to create charge and hold cycles that truly get the most out of a battery. t o h n e e     p th er a f t o   r g m et a s n  t c h e e     o m f t o h s e t    o c u e t l   ls o . f     B a  ui b l a d t i t n e g r   y a ,  n i   s  o n pt o i t  m a u  t m ri   v c ia h l a  t r a g s e k r, . Making sure that a battery undergoes the proper charge and hold cl AN IC FOR CHARGING both volta c g y e  e a   n r d e   q c u u i r r r e e s n   t p ,  r l e o c g i i s c i   o t n o     s s e e n q s u i e n n g  c a e  n t d h   e c   o c n h tr a o r l g   e o r f LEAD-ACID BATTERIES through its cycle, and temperature corrections — added to Battery technology has come a long way in recent years. the charger’s control and sensing circuits — to allow Driven by the reduction of size and power requirements of proper charging at any temperature. In the past this has processing functions, batteries now are used to provide  required a significant number of components, and a sub- portability and failsafe protection to a new generation of  stantial design effort as well. The UC3906 Sealed Lead-

I I FIGURE 1. The UC3906 Sealed Lead-Acid Battery Charger combines precision voltage and current sensing with vol- tage and current control to realize optimum battery charge cycles. Internal charge state logic sequences the device through charging cycles. Voltage control and sensing is referenced to an internal voltage that specially tracks the temperature characteristics of lead-acid cells. 3-78