Design of inductive wireless power charging, with data transfer, for e-bike. (Feasibility project).
Budget: £20 – £250 GBP
We are an small start-up, based in Edinburgh, developing a mid-mounted drive unit for e-bikes. Our product features an 8 speed gearbox, with integrated electronic gear shifting, and an integrated 500W motor. https://www.intra-drive.com/
Within out gearbox/motor unit, we have a small actuator which we would like to power wirelessly. (We can share more detail on this later, but don't want to openly disclose too much info without an NDA). We have investigated off the shelf inductive coils (used for phone charging), have done some basic tests, and are confident the required power can be delivered in this way.
Due to space constraints, we will not be able to use an off the shelf transmitter or receiver PCB, and fitting the required components onto the receiver PCB may be a challenge!
The focus of this feasibility project is to establish what hardware would be required (eg , and if it can fit within the available space. We a re looking for a quick turnaround so we can decide between different alternative technologies to carry forward.
Technical requirements/spec:
- Both the Tx and Rx coils must fit within a 40mm cylinder.
- Rx PCB must also fit within a 40mm cylinder (Tx PCB can be larger).
- Component height on the Rx must be minimised.
- 12W peak power transfer.
- 12V DC output from the Rx.
- Input voltage to Tx anywhere in the 5v - 48V DC region.
- Wireless data transfer, preferably using the same inductive coils
- Data via 4 pin GPIO bridge @ 5V logic (method of data transmission in non critical, can be discussed at start of project).
For this first stage of the project, we are looking for an electronic engineer with experience designing Rx and Tx circuits for inductive power/charging applications, to complete a feasibility project.
The sub-contractor must have completed projects of this nature before, and have in depth understanding, particularly of technology/hardware available for data transfer using inductive coils for phones etc.
We will supply a 3D STEP file which will include the proposed Tx and Rx PCB's, and surrounding components, connectors etc.
Project outputs:
1. a brief report summarising hardware options (available chips, options for transfer of data etc).
2. a proposed schematic for the Tx and Rx.
If the project looks feasible, we would then engage in a follow on project, to complete the electrical design and PCB layout.
Within out gearbox/motor unit, we have a small actuator which we would like to power wirelessly. (We can share more detail on this later, but don't want to openly disclose too much info without an NDA). We have investigated off the shelf inductive coils (used for phone charging), have done some basic tests, and are confident the required power can be delivered in this way.
Due to space constraints, we will not be able to use an off the shelf transmitter or receiver PCB, and fitting the required components onto the receiver PCB may be a challenge!
The focus of this feasibility project is to establish what hardware would be required (eg , and if it can fit within the available space. We a re looking for a quick turnaround so we can decide between different alternative technologies to carry forward.
Technical requirements/spec:
- Both the Tx and Rx coils must fit within a 40mm cylinder.
- Rx PCB must also fit within a 40mm cylinder (Tx PCB can be larger).
- Component height on the Rx must be minimised.
- 12W peak power transfer.
- 12V DC output from the Rx.
- Input voltage to Tx anywhere in the 5v - 48V DC region.
- Wireless data transfer, preferably using the same inductive coils
- Data via 4 pin GPIO bridge @ 5V logic (method of data transmission in non critical, can be discussed at start of project).
For this first stage of the project, we are looking for an electronic engineer with experience designing Rx and Tx circuits for inductive power/charging applications, to complete a feasibility project.
The sub-contractor must have completed projects of this nature before, and have in depth understanding, particularly of technology/hardware available for data transfer using inductive coils for phones etc.
We will supply a 3D STEP file which will include the proposed Tx and Rx PCB's, and surrounding components, connectors etc.
Project outputs:
1. a brief report summarising hardware options (available chips, options for transfer of data etc).
2. a proposed schematic for the Tx and Rx.
If the project looks feasible, we would then engage in a follow on project, to complete the electrical design and PCB layout.