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China’s ZTE pushing ahead with high-power wireless charging vehicle test deployment

ZTE Corporation, China’s largest listed telecommunications equipment company, is developing high-power wireless charging systems and services for electric vehicles, with a focus on public charging infrastructure. At a China-US workshop on electric vehicle standardization held in June (earlier post), Academus Tian, VP of ZTE New Energy Vehicle Co., presented an overview of ZTE’s efforts in wireless power transfer (WPT).

Tian said that ZTE’s inductive charging WPT module has a potential capacity of up to 30 kW, with a gap of 20 cm and efficiency of up to 90%. The footprint of the device is less than 1 m2; frequency is 85 kHz. ZTE, which has aggressively partnered with a number of passenger and commercial vehicles makers over the past few years, has recently launched a series of commercial vehicle (bus) WPT trials.

  • In September, in a joint R&D project between ZTE and Dongfeng Automobile, the first pre-commercial bus route in China deploying new-energy vehicles equipped with the ZTE high-power wireless-charging system went into operation in Xiangyang, Hubei.

  • In February 2015, ZTE launched a trial in Chengdu with two community buses (18 seats) on a 5 km (3.1 miles)route, partnering with the Shudu Group.

  • Also in February, ZTE launched a WPT trial for scenic shuttle buses in Dali City (Yunnan) on an 8 km (5 miles) route.

  • In March 2015, ZTE partnered with Hauer Auto to launch a wireless charging bus demonstration in a frigid climate (Changchung, with winter working temperatures around -26 ˚C (-14.8 ˚F)), using three 45-seat city buses on a 15.6 km (9.7 miles) route.

  • Also in March 2015, ZTE launched the trial of the largest capacity wireless charging system yet: 20 chargers that can support up to 100 12.5 meter buses in Zhengzhou.

  • Finally, the company is developing another trial at its own headquarters, with two charges supporting shuttle buses on the 12 km HQ-R&D line. The vehicle partner is Wuzhoulong Vehicle.

Tian said that the local governments in about 21 cities have already signed MOUs to deploy wireless charging solutions for pubic transportation; there are six cities in which WPT has already been launched.



It looks as though BYDs BEV buses with 324kwh on board have a fight on their hands!


Efficient Wireless chragers for 324 kWh batteries may not be ready for another 5 to 10 years. Since the majority of e-bus drivers will not put their clean hands on a charging facility, other technologies will be used.

However, lower capacity wireless units (15 to 50 KW) will be the 'in' thing to buy for PHEVs and BEVs before 2020.


Inherently unsafe!

"... up to 30 kW, with a gap of 20 cm and efficiency of up to 90% ..."

So 10% inefficiency is 3 kW pollution.

Read about the guy who invented lead for gasoline.

The only reason for this is laziness and not having robots that connect the charger automatically.


Wireless charging + robot driver would be a good mix.

Juan Carlos Zuleta Calderón

This reinforces many of the arguments in my recent article published on Seeking Alpha. See:


We lived with 15% efficient light bulbs and around 60% efficient e-motors for over 100 years?

Over 90% efficient first generation Wireless chargers would not be that bad?


There are some basic concerns about wireless power transfer over "whatever distance" (20cm in the described case): 1. Switching frequency 2. Inductive heating of everything around. Efficiency is not a problem. Proper matching will do the job. Some ... (almost said that) in power electronics leadership established 85kHz standard. It is a problem for coupling and leakage fields. We are talking kilowatts, guys. Big kilowatts too. Misalign your car just a little bit and 20cm gap will "melt all metal around". Higher switching frequency provides better coupling (less leakage as the result). Also, there is nothing wrong of "dropping" the receiving coil on to the antenna (well, with small gap remaining) and the problem is over. Hold on, ain't we coming back to GM concept of sort for their EV1 insertable charger? ...and there is nothing wrong about it. It was efficient, the leakage fields were minimized...
Alon Musk is a smart person and he might be aware of all these problems.

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