Renesas' winning combination solar battery charger design utilizes the benefits of the ISL81601 buck-boost controller. This design can be used to charge a wide array of battery voltages.
Using a solar cell to charge a battery is a very popular application. However, solar cells also present challenges because of the wide variability of the output voltage, depending on the amount of solar energy directed at the panel, temperature, and the load on the panel. Utilizing the benefits of the ISL81601 buck-boost controller, this design can be used to charge a wide array of battery voltages even if the solar panel is delivering an output voltage much lower than its nominal output. An RL78/G14 MCU is added to ensure that the battery is not overcharged and to monitor the status of the battery. With the addition of MPPT firmware, the RL78/G14 can control the ISL81601 to maximize the efficiency of the solar panels. Depending on the voltage of the solar array used, an optional DC/DC has been added to increase efficiency in higher voltage applications.
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Features
- Wide 4.5 V to 60 V input and 0.8 V to 60 V output voltage range
- Low-power MCU, RL78/G14, with high integration for low system parts count
- Programmable charge profiles and constant current/constant voltage modes safely support various charge states
- ISL81601 buck-boost controllers
- 60 V synchronous bidirectional buck-boost controller
- RL78/G14 MCUs
- RL78 core MCU
- Low-power
- High integration
- ISL8117 switching regulators
- Single output buck controller
- 4.5 V to 60 V for input voltage
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Renesas' winning combination solar battery charger design utilizes the benefits of the ISL81601 buck-boost controller. This design can be used to charge a wide array of battery voltages.
Hong Kong, China