The Battle To Fast Charge Your Smartphone Begins

In the first of this two-part series on quick charging — “Charge mobile phones in a Dash”, our blogger discussed the technology behind Oneplus Dash charging. In this follow-up blog post, our blogger compares current fast charging techniques for smartphones. Do you own one of them?

A couple of years ago, mobile phones did not have a display panel. The battery runtime was 10 times longer than today’s smartphones and could be charged in less than an hour. Today, smartphones have become bigger with a larger display and the battery size has increased because of the high energy required to run big screens, GPS and multiple applications that run on an internet connection. Though the smartphone can be charged using the old charger hosting a power of 2.5W USB port, it results in slow charging, thus creating a need for fast charging technology for devices in the consumer market.

Demands for more features in smartphones has resulted in advancement in charging technologies. In recent years, quick charging solutions such as Quick Charge, Dash Charge, and SuperCharge have evolved to keep up with our needs. They can charge the smartphone up to 60% in just 30 minutes.

Qualcomm Quick Charge

Qualcomm Quick Charge uses Intelligent Negotiation for Optimum Voltage (INOV) algorithm that maintains different voltage levels based on the current, power and temperature levels in the battery. It uses high voltage to provide the power required for fast charging. Qualcomm started with Quick Charge 1.0 (2013), followed by Quick Charge 2.0, 3.0, 4.0 and 4.0+ (in 2014, 2015, 2016 and 2017, respectively). Quick Charge 4.0+ is the latest fast charging technique that is 30% more efficient than its previous version. It includes an intelligent thermal balancing algorithm that charges the device through the cooler path automatically. This technique reduces device overheating that existed in the previous version. However, the heat dissipated from heat elements present inside the device increases its temperature.

Patent US9748788 describes this fast charging technique employed by Qualcomm.

Figure 5 of Qualcomm’s patent application US9748788 illustrating the charging circuit

Samsung Adaptive Fast Charge

Samsung Adaptive Fast Charging works in a similar way to Qualcomm’s Quick Charge 2.0. It uses high voltage to achieve fast charging. Samsung devices support fast charging even when they are charged using a Quick Charge or Moto TurboPower adapter. Adaptive Fast Charge certified charger provides 9V/2A (18W) power during fast charging mode. Samsung’s patent application US20160336763 describes the fast charging technique employed by Samsung, wherein current level at the battery is constantly monitored and the required voltage is supplied during fast charging mode. No exclusive heat controlling methods or elements were published by Samsung.

Moto TurboPowerTM

Moto TurboPower chargers come in three variants – TurboPower 15, TurboPower 25 and TurboPower 30. The number at the end indicates its maximum output power supported. TurboPower chargers are compatible with Qualcomm Quick Charge 2.0, 3.0 and USB-PD adapters. TurboPower technology when used with custom designed batteries works more efficiently than with normal batteries. However, this technology still lags behind other current fast charging standards.

Huawei SuperCharge

Huawei SuperCharge uses the Smart Charge Protocol (SCP) for charging the device intelligently. It has several layers of protection for current, voltage and temperature. It uses relatively low voltage and high current and is compatible with USB-PD. It has a step-down circuit similar to that of Dash charger that helps in avoiding heat resulting from the voltage conversion circuit (generally known as buck circuit). Patent application US20170222451 describes a charging method using ‘supercapacitors’ that helps in storing a larger amount of charge than the conventional capacitors. Huawei might be implementing these supercapacitors in their devices which would have led to the name ‘Super Charge’.

The following table shows a comparison between the discussed fast charging standards.

Consumers today are relying on their smartphones more than ever before. As mobile phones are being equipped with more functionality by the day, the growing consumer demand for faster charging and longer life batteries is only the rise. Who will lead this race, especially in a world looking to green is food for thought.

Featured image is intended for representational purpose alone and has been sourced from (

Pavan Kumar
Pavan Kumar

A passionate cricket player, an ardent moviegoer, and curiousness to know about the emerging technologies, especially in circuitry, summarises Pavan and his interests.

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