At PF, we require links to reputable sources for this. "I have heard" is generally not good in the technical forums. ThanksJulesP said:
Flyback pulses refer to the high-voltage spikes generated when an inductive load, such as a transformer or inductor, is suddenly switched off. In the context of lead acid batteries, these pulses can occur during the charging process, especially in systems using inductive components for voltage regulation or current limiting.
Flyback pulses can lead to the decomposition of the electrolyte in lead acid batteries. The high-voltage spikes can cause electrolysis of the water in the electrolyte, producing hydrogen and oxygen gases. This gas evolution can reduce the efficiency of the battery, increase maintenance requirements, and potentially lead to safety hazards due to gas accumulation.
Signs of electrolyte decomposition due to flyback pulses include increased gassing (bubbling) within the battery, a decrease in electrolyte levels, and changes in the specific gravity of the electrolyte. Additionally, the battery may exhibit reduced capacity, higher internal resistance, and shorter overall lifespan.
To mitigate the negative effects of flyback pulses on lead acid batteries, it is essential to use proper circuit design and protective components. This can include using flyback diodes to clamp the voltage spikes, snubber circuits to absorb excess energy, and ensuring that the charging system is well-regulated to prevent excessive voltage fluctuations. Regular maintenance and monitoring of the battery can also help identify and address issues early.
Yes, there are specific charging techniques that can minimize electrolyte decomposition in lead acid batteries. Using a multi-stage charging process, such as a three-stage charger (bulk, absorption, and float), can help regulate the voltage and current more effectively. Pulse charging with controlled pulse width and frequency can also reduce the likelihood of generating harmful flyback pulses. Additionally, temperature compensation during charging can help prevent overcharging and excessive gassing.