The boost buck charger can fly better with the drone.

In recent years, drones have been in full swing. Except for e-commerce companies such as Amazon and JD.com, which are listed as future "courier killers", we can also see many children driving drones in aerial photography. The game market is also extremely hot, and various work scenarios such as agriculture and transportation are expected to be used in the future. However, there is also a problem with drones, that is, the flight time is very short. If the load is not heavy, it usually needs to be charged once or replaced once in 10-30 minutes. Therefore, during the flight interval, the user needs to charge the battery quickly and safely for backup. At the same time, it is necessary to use a buck boost charger for a multi-cell battery such as a drone. When it comes to charging, we also have to mention Many advantages to USB Type-C.

USB Type-C has a slimmer design, faster transfer speed (up to 10Gbps) and more powerful power transmission (up to 100W) and other appearance and technical advantages, so it has been optimistic in the industry since its launch, more and more electronic products Beginning with USB Type-C and USB PD ports, they are increasingly seen from mobile phones, laptops, mobile power, and drones. However, the Type-C port will encounter complex external power supplies in the working process, and step-up and step-down is essential. When the device is charging, if the voltage source is higher than the battery, the buck boost battery charger can lower (buck) the voltage source to charge the battery, or can boost (boost) the voltage source separately. When powering peripherals, if the peripheral requires a lower voltage, the buck boost charger can lower the battery voltage, and if a higher voltage is required, the device can boost.

As the number of USB Type-C and USB PD ports continues to increase, booster buck chargers are gaining more and more attention. During buck-boost, the performance of the buck-boost battery charge controller directly determines the electronics. Product performance. TI recently introduced a pair of highly flexible single-chip buck-boost battery charge controllers, the bq25703A and bq25700A, for 1 to 4 (1S to 4S) designs. Dr. Wen Sihua, Manager of China Market and Application Department of Texas Instruments Battery Management Products (BMS), told the non-network reporter that “bq25703A and bq25700A support I2C and SMBus interfaces. The two advantages of the product are: achieving the highest efficiency and maximization in the industry. Increased input power. We use a new advanced battery algorithm that intelligently charges the battery with maximum power point tracking technology for full power output. A unique algorithm called Input Current Optimization (ICO) automatically detects the maximum input power. Optimize current while maintaining system and charge current consistency to ensure maximum input power is utilized."

ICO (Input Current Optimized) Real-Time Power Adapter for High Power Efficiency

When the drone is flying, it needs multiple batteries to work alternately to meet the requirements, so they use a custom adapter to charge the fixed number of battery strings. But there is always a situation where two people play the drone at the same time, one battery is 3 strings, one battery is 4 strings, which requires two adapters. If the adapter with Type-C interface can be designed as an adapter, the output can be compatible regardless of the output, because bq25703A and bq25700A are suitable for 1 to 4 cell design, efficient conversion between buck and boost operation. Without any dead zone.

Second, the ability to achieve 97% efficiency thanks to TI's unique ICO algorithm, ICO can detect the current capability of the adapter in real time. Dr. Wen Sihua made a detailed explanation. "As shown in the above figure, this is our VBus. Some changes have occurred after the battery is connected. After the battery is connected, it starts to charge. As the ICO mode, it is used as a relatively small current. Test, for example, 500 mA starts to start, the adapter works very comfortably at 500 mAh, when the current is gradually increased, we will find that the Bus voltage suddenly drops, it can fall and stay in this mode, The VEDPM mode is started. In this mode, the adapter is actually overloaded. Due to the protection of the VEDPM function, the adapter is overloaded but still working, so this point can be maintained, but this is not the optimal situation because it makes the adapter If the overload is over, the adapter will be hot. The best way to handle it is to get the adapter out of this state. The ICO function will allow the current to fall back a bit. When it returns, the adapter will be out of overload."

Support mobile power single port bidirectional working mode

In addition to drones, the closest thing to our lives is mobile power. The current mobile power supply supports a USB A port and a Micro USB port. In the future, only one USB Type-C port may be reserved, which can input and output, which involves lifting and lowering and compatibility issues.

Dr. Wen Sihua said, "bq25703A can solve these problems. First, regarding compatibility, bq25703A has wide USB On-the-Go (OTG) output compatibility, supports 5V to 20V input-ready devices, and can pass programmable current The adjustment provides adjustable output for USB OTG; secondly, the interface works in both directions, it can not only charge the mobile power itself, but also can be connected to the mobile phone and other devices as an output port, so to achieve bidirectional boost and buck; High efficiency, low price of mobile power, so customers will choose cost-effective devices, but it does not want products to be dangerous due to over temperature and failure, so high efficiency is very important. We provide 97% of the industry's highest efficiency. It is used to solve the problem of heat dissipation for fast charging. Fourthly, it has comprehensive system performance and data acquisition and reporting capabilities, which greatly enhances the safe design of mobile power. Whenever a command is sent through the host, the user can understand the battery. Input voltage, output voltage, input current, output current, including its temperature, this part is usually passed through the microcontroller

In addition, since the working environment of the drone is now more variable, it may be in the sky at high altitude, so the bq25703A sets the temperature range between -40 ° C and 85 ° C, and the battery charging adjustment accuracy is between ± 0.6%. A high level of charging accuracy ensures that the battery is optimally charged over temperature.

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