Universal fast charging: the future trend of battery-powered applications

Nowadays, those “always online” consumers want to charge their portable Electronic products anytime, anywhere. For example, we often see passengers charging mobile phones, laptops and headsets while waiting to board an airplane or take a train. However, due to the different charging methods of each device, these consumers must carry different adapters, and it is quite troublesome to remember which adapter is suitable for which device (see Figure 1).

Nowadays, those “always online” consumers want to charge their portable electronic products anytime, anywhere. For example, we often see passengers charging mobile phones, laptops and headsets while waiting to board an airplane or take a train. However, due to the different charging methods of each device, these consumers must carry different adapters, and it is quite troublesome to remember which adapter is suitable for which device (see Figure 1). For engineers to solve this trouble, their battery charging system design must support charging from various input sources.

Universal fast charging: the future trend of battery-powered applications

Figure 1: Charging using different input sources and adapters

Why consider using USB Type-C PD charging?

Designing a single-chip charger integrated circuit (IC) to charge multiple battery-powered devices with different configurations and different input voltage ranges is a complicated process, because traditional adapters are not compatible with all battery-powered devices, and the power of traditional USB adapters It is limited to 5-15 W, thus limiting the portable battery-powered devices they will support.

As shown in Figure 2, USB Type-C™ Power Delivery (USB PD) provides a useful alternative for fast and efficient charging of various applications. The output voltage range of USB PD can be adjusted according to battery-powered devices with different battery configurations to utilize the 5 W to 100 W (20V/5A) power spectrum of USB Pd.

Universal fast charging: the future trend of battery-powered applications

Figure 2: USB PD realizes universal fast charging

To further talk about the above-mentioned example of passengers charging one or more devices, considering that they may not always be able to connect to the power source, ideally, their devices can be fully charged quickly, and once fully charged, the battery can grow longer. Time to use. Even if they only have a short stay of 15 minutes to charge the device, this is enough to keep the battery for several hours.

Therefore, in order to meet consumer expectations, design engineers are looking for solutions with the following functions:

It can simplify the design and realize universal charging at the same time-it can charge multiple battery-powered devices with different configurations (1 to 4 batteries in series) and different input voltages.

It can extend battery life and use larger battery capacity to provide consumers with a better experience.

It can charge effectively while reducing heat dissipation, so as to reduce the power loss in the charger IC to a greater extent.

It can protect the input adapter, battery and system from cascading failures.

TI’s new buck-boost battery charger ICs (including BQ25790 and BQ25792) utilize USB PD input to increase flexibility and can charge 1S-4S batteries within the input voltage range of 3.6 V to 24 V. These buck-boost chargers allow you to freely choose whether a single charger IC is a better design choice for compact, small-size battery-powered devices (such as mobile phones, laptops, Bluetooth headsets or medical devices), rather than multiple designs. A step-up or step-down of the power level is required to keep the application within a safe operating voltage range.

BQ25790 and BQ25792 utilize low-power charger ICs to extend battery runtime and save battery power as much as possible when not using applications. In addition to low power consumption, the charger is also equipped with a charging timer, which can perform additional charging on the basis of the normal charging cycle to ensure that the battery can be charged to a larger capacity (see Table 1).

parameter

Programmability

Resolution

default

Charging voltage

3 V-18.8 V

10 mV

4.2 V (one battery in series[s]), 8.4 V (2s), 12.6 V (3s), 16.8 V (4s)

recharging current

50 mA-5 A

10 mA

2 A (1s), 2 A (2s), 1 A (3s), 1 A (4s)

On-the-go (OTG) voltage

2.8 V-22 V

10 mV

5 V

OTG current

120 mA-3.32 A

40 mA

3 A

Precharge current

40 mA-2 A

40 mA

120 mA

End current

40 mA-1 A

40 mA

200 mA

Charge timer

Disabled, 15 minutes, 30 minutes, 45 minutes

Disable, 15 minutes, 0 minutes, 45 minutes

Table 1: Programmable functions included on BQ25790 and BQ25792

For power supply designs that require long-term operation, fast and efficient charging, and compact design, USB PD charging has high flexibility and can charge various applications while maintaining a low bill of materials and reducing the overall solution size. To learn more about considering power density and low quiescent current when designing, check out the other resources below.

The Links:   FF800R17KE3 EP4CE115F23I7N IGBT-SUPPLIER

Related Posts

Leave a Reply

Your email address will not be published. Required fields are marked *