Summary:
Lead-acid batteries have the advantages of low price, reliable power supply, stable voltage, etc., so they are widely used in defense, communications, railway, transportation, industrial and agricultural production departments. In recent years, the fully sealed maintenance-free lead-acid battery has the advantages of good sealing, no leakage, no pollution, etc., which can ensure the safety of the human body and various electrical equipment, and does not require any maintenance during the whole life, thus uncovering the lead-acid battery. A new page in the development process. As we all know, communication equipment generally uses maintenance-free batteries as backup power. Many uninterruptible power supply systems (UPS) for electronic equipment are also inseparable from maintenance-free batteries. In addition, more and more are used in emergency lights, automobiles, and yachts. Maintenance free battery. However, due to the incorrect charging method, the charging technology cannot adapt to the special needs of the maintenance-free battery, making it difficult for the battery to reach the specified cycle life. Based on this, this paper proposes a smart charger design for a fully sealed maintenance-free lead-acid battery. It uses an advanced three-stage charging control method to effectively improve charging efficiency and extend battery life.
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What is RF PCB?
Introduction to RF circuit board: RF is Radio Frequency, which refers to radio frequency, a signal with a very high frequency. The choice of circuit board substrate depends on the performance index of the circuit board. It can be ordinary FR4 epoxy glass fiber, or special microwave substrate such as Teflon. RF circuit board standards: 1. Low-power RF circuit boards mainly use standard FR4 materials (good insulation properties, uniform material, and dielectric constant ε=4, 10%). 2. In the design of the Microwave radio frequency board, the various components should be arranged closely to ensure the shortest connection between the various Electronic Components. 3. For a mixed signal high frequency mixing pressure plate, the RF part and the analog part should be far away from the digital part (this distance is usually more than 2cm, at least 1cm), and the ground of the digital part should be separated from the RF part. 4. When choosing to work Electronic Components in a high-frequency environment, use surface mount devices as much as possible. This is because surface mount Electronic Components are generally small in size, and the pins of Electronic Components are very short.
Radio frequency (RF) circuit board design is often described as a kind of "black art" because there are still many uncertainties in theory. But this is only a partial overarching point of view, there are still many rules that can be followed in the design of RF circuit boards. However, in actual design, the really practical trick is how to compromise these laws when they cannot be implemented due to various restrictions.
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