Constant Current Constant Voltage SMPS (Switch Mode Power Supply)

Description: This constant current constant voltage switched-mode power supply (SMPS) is designed for efficient battery charging. The circuit outputs a constant voltage of 7.2V and a constant current of 600mA. The operation mechanism is straightforward: when the load impedance is high, the output voltage remains stable at 7.2V. As the load impedance decreases, the output current increases. The output voltage remains constant as long as the load does not exceed 600mA (equivalent to a 12-ohm load). If the load attempts to draw more than 600mA (when the impedance drops below 12 ohms), the circuit enters constant current mode. In this mode, the output current is maintained at 600mA, and if the load impedance continues to decrease below 12 ohms, the output voltage will drop below 7.2V to keep the current constant.

The described circuit functions as a constant current constant voltage (CC-CV) power supply, which is particularly useful in battery charging applications. The circuit is designed to operate in two distinct modes: constant voltage (CV) and constant current (CC). Under CV mode, when the load impedance is high, the circuit maintains an output voltage of 7.2V. This is beneficial for charging batteries, as it allows for a stable voltage that can effectively charge the battery without overvoltage conditions.

As the load impedance decreases, the circuit transitions to CC mode when the current exceeds 600mA. This feature is crucial for preventing damage to the battery and ensuring safe operation. The design incorporates a feedback mechanism that monitors the output current and adjusts the voltage accordingly to maintain the set current limit. If the load demands more current than the circuit can provide safely, the output voltage is reduced to prevent excessive current flow, thereby protecting both the power supply and the connected load.

In practical applications, this SMPS can be integrated into various battery charging systems, where it can adapt to different load conditions while ensuring efficient energy transfer and battery safety. The circuit's ability to switch between CV and CC modes makes it versatile for different charging scenarios, including lead-acid, lithium-ion, and other battery chemistries. Overall, this design provides a reliable solution for efficient battery charging while maintaining safety and performance standards.This constant current constant voltage SMPS can be used to efficiently charge a battery. This circuit gives 7. 2V at constant voltage mode, and 600 mA at constant current mode. Here is the schematic diagram of the circuit: The mechanism is simple, when the load impedance is high, then the output voltage will be constant at 7. 2V. When the load imped ance get lower then the output current will increase. Any load impedance doest affect the output voltage, the voltage will be constant, as long as the load draws no more than 600 mA current (12 ohm load). When the load trying to get more current than 600 mA (the impedance falls below 12 ohm) then the constant current mode will work.

At this mode, the current will be constant. If the load impedance get lower than 12 ohm then the output voltage will drop below 7. 2 volt to keep the current constant at 600 mA. We aim to transmit more information by carrying articles. Please send us an E-mail to wanghuali@hqew. net within 15 days if we are involved in the problems of article content, copyright or other problems. We will delete it soon.