Three input charge controller

Project Info

Case:

The clients requested for designing a charge controller circuit using 3 inputs for three power sources for charging a storage of batteries. The batteries were to supply 876 W for AC loads through an inverter. The client had also requested the following requirements:

  • The circuit had to be designed for charging 7V, 12V, and 24V batteries.
  • The mains’ conversion from AC to DC was to be implemented in the charge controller design.

Challenges:

The client had requested the following priorities for the charge controller.

  1. The first priority was the solar PV system.
  2. In the absence of a sufficient solar power like at nights or winters, the next priority was the power produced by the wind turbine.
  3. Finally, in the absence of  either sunlight or wind, the power grid was to be used for charging of the batteries.

The existing charge controllers supported only two energy sources, solar PV systems, and wind turbine, and there were no triple-purpose devices or circuits in the market.

Solution:

Several options were considered for designing this circuit for the client. One option was using an MCU control system and the another option was using an Op-Amp system. Upon the request of the client for a more simple design, the second option was chosen; i.e., designing the circuit using comparator op-amps, Zener diodes, and relays.

We designed what the client had requested and provided him with full circuit design.

Results and impacts:

The final design was quite satisfying, and despite its simple design, the client was fully pleased. The product worked properly and fulfilled the request of the client.

Description

The clients requested for designing a charge controller circuit using 3 inputs for three power sources for charging a storage of batteries. The batteries were to supply 876 W for AC loads through an inverter. The client had also requested the following requirements:
• The circuit had to be designed for charging 7V, 12V and 24V batteries.
• The mains’ conversion from AC to DC was to be implemented in the charge controller design.

Client:
Date:
November 14, 2016
Location:
Category:
Electrical and Electronic Engineering
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