LiFePO4 Solar Charger Circuit & PCB Design
Budget: €250 – €750 EUR
I'm looking for an expert in circuitry and PCB layout to help develop a prototype for a single cell LiFePO4 Solar charger. The charger will have the dual function of charging batteries as well as powering devices directly (power path support).
Key Requirements:
- The solar charger needs to handle an input voltage range of 4-6V minimum, 3V input support and support of higher input voltage is a plus.
- input overvoltage protection for the board needs to be installed
- overvoltage and undervoltage protection for the battery needs to be in place
- maximum charging current is 950mA. Higher charging currents are a plus but not needed.
- An USB input of 5V also needs to be supported and automatically be used if attached.
- It should output a stable 5V at 1A min or 3.3V at 1A minimum, which should be switchable with different output pins.
- MPPT is a plus, but input current decrease adapting to a stable Vin is also accepted (similar like in BQ26188 for example)
- LiFePO4 battery support is required, support of other battery chemistry and charging voltages is a plus
- fuel gauge support to access state of charge of the battery
- power path support: if enough power is supplied by the solar cell or the attached USB plug, load will be powered by these sources. If not sufficient power is provided by the input sources, the battery needs to seamlessly step in. If input power exceeds load, battery will be charged.
Project has 3 phases:
- Design phase: to define and design the circuit along the specifications, available components and estimated costs.
- Production phase: the final design needs to be transferred by the bidder to a chosen PCB manufacturer that also supports assembly service. The bidder will answer questions that might arise and be asked during the production phase.
- Testing phase: the final boards will be sent to me. If needed, I will need to finalize components and test the board for full functionality.
Ideal Skills and Experience:
- Proficient in circuit design and PCB layout
- Prior experience with solar charger prototypes
- Knowledge of LiFePO4 batteries
- Able to deliver a functional circuit and PCB layout that will turn into a full working prototype.
Possible charger ICs could be (but is not limited to) BQ25186, BQ25188, CN3157
Your design suggestions are very welcome.
Please state in your bid "CAN_COMPLY" so I see that you fuklky read and understood the requirements and that you will fully comply to these requirements. If anything is unclear - you need to clarify be asking me, BEFORE you place a bid. Your bids will be final.
Key Requirements:
- The solar charger needs to handle an input voltage range of 4-6V minimum, 3V input support and support of higher input voltage is a plus.
- input overvoltage protection for the board needs to be installed
- overvoltage and undervoltage protection for the battery needs to be in place
- maximum charging current is 950mA. Higher charging currents are a plus but not needed.
- An USB input of 5V also needs to be supported and automatically be used if attached.
- It should output a stable 5V at 1A min or 3.3V at 1A minimum, which should be switchable with different output pins.
- MPPT is a plus, but input current decrease adapting to a stable Vin is also accepted (similar like in BQ26188 for example)
- LiFePO4 battery support is required, support of other battery chemistry and charging voltages is a plus
- fuel gauge support to access state of charge of the battery
- power path support: if enough power is supplied by the solar cell or the attached USB plug, load will be powered by these sources. If not sufficient power is provided by the input sources, the battery needs to seamlessly step in. If input power exceeds load, battery will be charged.
Project has 3 phases:
- Design phase: to define and design the circuit along the specifications, available components and estimated costs.
- Production phase: the final design needs to be transferred by the bidder to a chosen PCB manufacturer that also supports assembly service. The bidder will answer questions that might arise and be asked during the production phase.
- Testing phase: the final boards will be sent to me. If needed, I will need to finalize components and test the board for full functionality.
Ideal Skills and Experience:
- Proficient in circuit design and PCB layout
- Prior experience with solar charger prototypes
- Knowledge of LiFePO4 batteries
- Able to deliver a functional circuit and PCB layout that will turn into a full working prototype.
Possible charger ICs could be (but is not limited to) BQ25186, BQ25188, CN3157
Your design suggestions are very welcome.
Please state in your bid "CAN_COMPLY" so I see that you fuklky read and understood the requirements and that you will fully comply to these requirements. If anything is unclear - you need to clarify be asking me, BEFORE you place a bid. Your bids will be final.