Charging Circuits

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Battery Charging Circuits consist of three main elements: Battery, Battery management system, charging source. This system could change depending on the battery or charging source but should be a good basis point. This page will go over how to choose the proper battery and BMS system given a charging source.

Charging Source

Charging Source Voltage Type Harnessing Type Efficiency (1 [worst - 5 [best])
Thermoeletric Peltier DC Temperature Change 1
DC Motor DC Mechanical Rotation 4
Generator (AC motor) AC Mechanical Rotation 5
Solar Power DC Light 3
Piezoelectricity AC Mechanical lateral Oscillation 3

The charging source is the most important element and will be the starting point of this project. The charging source device depends on the energy it is trying to harvest. For instance, if there is a huge difference in temperature in a given location, you would use thermoeletric peltier devices. If there is a temperature difference between each side of the device, a constant DC voltage will be made available between the prongs. The chart to the right will give important information on the different types of charging sources. Note: The voltage output depends on many factors and should be tested for each design. The Efficiency factor is an estimated number; the Efficiency factor mostly depends on the device and how the energy is harnessed.

Battery/Storage Element

Battery Management System

The Battery management system (BMS) is used so that the battery can be safely charged and discharged. If a BMS isn't used, the battery can be overcharged which will cause the battery to lose capacity and power. A battery is charged when current is forced backwards into the battery.