The mobile backup power supply solves the outdoor power supply problem of digital products. It uses natural renewable energy to convert energy storage or household electricity storage, and solves the outdoor power supply and power supply problems of mobile digital products. . The product features are light, efficient and diversified.

1. Design requirements for portable solar backup power supplies.

The portable solar backup power supply uses solar energy as the conversion source, converts solar energy into electrical energy, and stores electrical energy through lithium batteries to achieve the purpose of providing outdoor power for mobile digital products. The entire product uses a single-cell large-capacity lithium battery as energy storage, and the charging adopts a two-layer charging mode: that is, the solar panel is charged by sunlight, and the charger adopts a two-layer charging mode. There is a 5V output at the output. The maximum output current can reach 2A, which can meet the power requirements of related digital products. Accurate LED display, in the form of LED lights, effectively displays the remaining battery power to the user in an accurate percentage, so as to achieve efficient and intuitive purposes.

1) Lithium battery model design requirements: 6535134/3.4 Ah/3.7 V.

2) Solar panel conversion parameters: 5V/350mA

3) Part of the protection circuit design requirements.

    1. Single battery overcharge protection voltage: 4.35 & plusmn; 0.25V

    2. Single battery regeneration overload protection voltage: 4.15 & plus 0.50V

    3. Single battery overload protection voltage: 2.40 & plusmn; 0.08V

    4. Single battery over-discharge recovery voltage: 3.00 plus 0.10V.

    5. 5~8A overcurrent protection value (10ms).

    6. Overheating protection value (renewable): 70 and 5 degrees

    7. The finished battery also has short circuit and reverse charging protection.

4) Design requirements for battery cycle life: 300~500 times (national standard charging and discharging standards

5) Design requirements for battery size.

2. Design drawing of portable backup power supply.

1) Protection IC: It is mainly designed to protect the rechargeable lithium battery. Due to the chemical characteristics of the lithium battery, it must provide protection functions such as overcharge, overdischarge, short circuit and overcurrent. In order to avoid dangers such as burns and explosions.

2) Part of the step-down module: solar panel (5V/350mA), 5V charger input step-down module, according to the characteristics of the lithium battery, to achieve specific pre-charge, constant current And the sequential charging function of constant voltage charging mode.

3) Booster module part: adopts a regulated 5V output circuit, the maximum output current can reach 2A.

4) Charger module part: use Tonghe 5V/1.5V charger

5) LED display part: Use voltage comparison to display battery power.

6) Solar panel part: convert solar energy into electric energy, the output parameter is 5V/350mA

7) Lithium battery cell: PL6535134/3.4Ah/3.7V (ATL).