High Efficiency, Large Power, High Mobility, Multi Load Wireless Charging Solution 1

The Framework of Wireless Power Transmission Technology

wireless power transmission

Basic Structure

  • Electronic circuit
  • Magnetic field coupling
  • Electromagnetic joint control

The vast majority of domestic wireless charging companies only involve electronic circuits and do not conduct in-depth research on magnetic field coupling and magneto-electric combined control.

Internationally, WiTricity has basically built a ternary technology architecture after acquiring Qualcomm in 2019.

Through more than 10 years of basic research and development, we now have a complete ternary technical framework and has been verified by industrial trials.

Competitive Structure

  • Environmental biosafety
  • Advanced electromagnetic materials
  • Structural thermal management

There are few domestic companies involved in the original research and development in this area.

WiTricity has accumulated a certain amount of foreign body environmental monitoring, but it is still in the exploratory stage in electromagnetic materials, structure, and thermal management.

We have accumulated more than 10 years in advanced electromagnetic materials and have in-depth basic research in environmental biological perception, structural mechanics, and Multiphysics.

ONEPOINTECH Technology Breakthrough from “Symmetry” to “Asymmetry”

Pain Point of Existing Wireless Charging Technology

Symmetry is required but it’s very difficult to guarantee the symmetry while in actual applications.

  • The sizes and shapes of the receiving and transmitting coils are asymmetric.
  • The spatial positions of the receiver and transmitter are asymmetric.
  • The number of loads, type, parameters is asymmetric.

Charging Principle of Our Technology

Our wireless charging principle:

We have discovered, utilized and locked the “orthogonal” mode of work in the asymmetric wireless charging system.  And have applied for dozens of international and domestic patents and achieved the below”

Frequency locking: lock the working frequency of the system, and the system always works at the given frequency that can be designed.

Effect locking: the system always works in the efficient and anti-interference orthogonal mode, and the highest efficiency of the system can always be locked firmly in the asymmetric scene.

Power locking: dynamic adjustment of power under the premise of stable mode frequency and efficiency, greatly improving safety and stability.

Our Wireless Charging Technology Features

Standard Efficient working distance

(distance diameter ratio)

Center allowable offset Load(s) Dynamic charging Standby power Power transmission

volume density

Qi 0.1 very low single no low medium
Airfuel 0.2-0.8 low single no high pretty high
Ours 0.1-1.2 high multiple realizable low high

Note: the distance to diameter ratio refers to the ratio of the working distance to the equivalent diameter of the smaller coil in the system. For example, for the coil with diameter / side length of 50 mm, the distance to diameter ratio is 0.1, and the transmission distance is 5 mm.

Energy transmission volume density refers to the transmission power of equivalent volume of system circuit + coil, such as the coil combination size of similar circuit, high density and high transmission power.

We’re the first to discover, utilize and lock the “orthogonal” working mode in asymmetric wireless charging system in the world.

1. Miniaturization 2. High redundancy 3. Super distance 4. Adaptive development 5. Multi load universal 6. Rich application scenarios

Applications: robot, AGV(Automatic guided vehicle)

Power range: 60-2000 watts
Full-day autonomous power supply capability indoors and outdoors
Over-distance, high-power transmission greatly reduces positioning accuracy
High electromagnetic compatibility and environmental safety
Non-contact power supply / meet the safety requirements of the application site

The disadvantages of the brush pressure-contact charging mechanism

1. Mechanical parts loss: oxidation/passivation, spring slack, equipment collision

2. High alignment requirements, frequent bad contacts, low success rate

3. Poor contact, contact surface heating caused by the dislocation of the contact piece

4. Start the arc and accidentally leave the arc, which does not meet the explosion-proof requirements

5. Not applicable to wet, dusty, dirty, and crowded areas

Autonomous charging of autonomous moving devices has become an important configuration, but there are still many unsuitable situations that limit the robot/AGV.

Application 1: non-contact wireless charging is the best choice for outdoor dangerous environment

For inspection robots, we have minimized the wireless charging RX coil to three standard sizes:




The corresponding charging distances are:




horizontal offset 15-40mm

This project is for inspection robots in places like high voltage rooms, photovoltaic power plants, etc.

The wireless charging module has met industrial production standards with charging power around 300w-800w.

wireless charging inspection robot
wireless charging inspection robot

Key technologies

Working distance: no matter it’s installed in the bottom or on the side, the wireless charging distance should be around 2-9cm.

Freedom: the positioning is not very accurate in the outdoor environment. The wireless charging module is required to have a +-4cm alignment deviation.

Magnetic shielding: the receiving coil is close to the metal parts and the control circuit, so it has high requirements for magnetic shielding design to control the magnetic divergence.

Metal environment: magnetic ferrite structure restricts the magnetic field space, not affected by the complex metal environment.

High temperature: high requirements of heat dissipation and heat resistance, the highest ambient temperature in summer is 50 degrees. It is required that the efficiency of the system in the working range should be high and stable, and the heat dissipation structure should be well designed.

A wireless charging receiving module is installed at the rear of the robot:

1. It is arranged in a narrow field to adapt to the steering alignment of the differential wheel

2. Adapt to temporary tasks without civil engineering

3. Fully enclosed installation, adapt to the coexistence of human and machine environment

It has been used in airports, industrial parks, squares, bridges, etc.

A wireless charging receiving module is installed at the chassis of the robot:

1. Adapt to high chassis, two-wheel steering alignment

2. Adapt to fixed tasks, high-security requirements of the site

3. Equipped with charging room and ground transmitting coil

It is used in the substation, warehouse, photovoltaic field, and high-security level places for continuous inspection.

wireless charging receiving module installed at the bottom4
wireless charging receiving module installed at the bottom4
wireless charging receiving module installed at the bottom4
wireless charging receiving module installed at the bottom4