![]() The current can be approximately equal to the Ah rating of the battery for those which need to be revived and are badly sulfated, for the good batteries the charging current could be around 1/10th or 2/10th of their Ah rating. The transformer voltage must be rated approximately 25% more than the battery voltage rating, that is for a 12V battery a 15 to 16V supply may be used across the battery terminals. So what would you need to make this super simple battery desulfator circuit which will also charge the given battery, and additionally possess the ability to keep the new batteries from developing the sulfation issue?Ī suitably rated transformer, a bridge rectifier and an ammeter are all that's needed for the purpose. provided the battery is still within the curing range and is not beyond the reviving state. ![]() The design not only desulfates a battery, it keeps the new batteries from developing this issue and simultaneously charges them to the desired levels.Īt the beginning of this post we learned how to desulfate using PWM concept, however a deeper research shows that the process of desulfating a battery may not necessarily require a precision PWM circuit, the supply just needs to be oscillating at some given rate, and that's enough to initiate the desulfating process (in most cases). To make this simplest yet effective battery desulfator with charger circuit you would just require a suitably rated transformer, and a bridge rectifier. The output from the IC is appropriately amplified through a couple transistors so that it is able to deliver the said high current pulses to the battery which needs to be desulfated.Ģ) Desulfating with a Transformer and Bridge Rectifier Circuit The IC 555 is configured and used in its standard PWM control mode. The circuit of a PWM battery charger discussed here can be considered as the best design for carrying out the above desulfation process. These can also be used to automate the process since it takes a long period of time to desulfate a battery fully." Electronic circuits are used to regulate the pulses of different widths and frequency of high current pulses. Short high current pulses tend to work best. This technique, also called pulse conditioning, breaks down the sulfate crystals that are formed on the battery plates. " Desulfation is achieved by high current pulses produced between the terminals of the battery. ![]() Here's an excerpt from wikipedia, which says, Implementing the method through PWM controlled circuit is probably the best way of doing it. ![]() These high current charging pulses should be well optimized through some control circuit and should be diagnosed carefully while implementing the process. Unfortunately there's no effective way of tackling this problem, however it has been researched that the jammed sulphur deposits over an effected battery may be broken down to some extent by subjecting the battery to high current bursts while charging it. Normally this happens when the battery is not being used for long periods and the charging, discharging processes are not done very frequently. This layer deposit seriously deteriorates the chemical actions inside the battery while charging or discharging making the battery inefficient with its power delivering capabilities. Sulphation is a process where the sulfuric acid present inside lead acid batteries react with the plates overtime to form layers of white powder like substance over the plates. What is Sulphation in Lead Acid Batteries Charging a lead acid battery through PWM method is said to initiate desulfation, helping recover battery efficiency to some levels. Sulphation in lead acid batteries is quite common and a big problem because the process completely hampers the efficiency of the battery.
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