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  1. Woosh

    Brexit, for once some facts.

    he's a politician, he does not expect to be trusted and believed.
  2. Woosh

    Wireless battery charging for e-Bikes

    The first advantage is better reliability. There is no simple way to stop corrosion and water ingress around the sockets, there is no way you could build mechanical contacts and switches to last forever. The best for now is to replace them by FETs. I guess the charging circuit will be built into...
  3. Woosh

    Wireless battery charging for e-Bikes

    but there is no direct transfer of energy in a conventional charger. You have to separate the mains from the battery for safety and in any case, the voltage translation uses a transformer.
  4. Woosh

    Wireless battery charging for e-Bikes

    that is missing the point. A wireless charger does not use extra transformer - only one like a normal charger. When you look closely at the construction of the separation transformer, the primary winding is replaced by the antennae, the secondary winding is replaced by the receiving coil, the...
  5. Woosh

    Wireless battery charging for e-Bikes

    the current e-bike chargers waste about 10% of input energy, wireless chargers for that sort of power range are not less efficient. Some designs claim 93%-95% efficiency. Note that chargers under 5W are lousy on efficiency. The higher the power range, the better the efficiency of wireless...
  6. Woosh

    Wireless battery charging for e-Bikes

    you need to look into exactly the quantity of strayed radiation and its absorption. Design of the antena reduces stray radiation and also, human bodies absorb extremely little of radiation under 300MHz. We are looking at 10kHz-100kHz range, not X-ray or cosmic rays. Just look at the design of...
  7. Woosh

    Wireless battery charging for e-Bikes

    wireless charging is not different compared to your current e-bike charger. The basic design is the same, except for the transformer that separates the battery side from the mains.
  8. Woosh

    Wireless battery charging for e-Bikes

    you don't wear a mesh suit when you use your microwave oven because the mesh on the door stops 99.999% of the radiation. The body absorbs very little radiation below the microwave frequencies. E-bike chargers run between 10kHz to 100kHz, they don't even have mesh shields. Nothing to worry about.
  9. Woosh

    Wireless battery charging for e-Bikes

    e-bike chargers use a small transformer to transfer the energy from the mains to the battery. When you look closely, what you do here is simply to replace that small transformer by a bigger one. The rest of the design differs little. Also, a little shielding can go a long way, like the mesh on...
  10. Woosh

    Wireless battery charging for e-Bikes

    TV transmitters are much more powerful than an e-bike charger. there are also plenty of non-radiative wireless charging designs. google up resonnant inductive coupling transfers.
  11. Woosh

    Brexit, for once some facts.

    it won't be Mad Max but as far as I've known about tories policies, they will keep lowering the bar to 'let market forces increase efficiency'. It is still encouraging that DD comes to the side of cooperation.
  12. Woosh

    Best conversion kit for 27.5 inch hybrid bike

    we have BPM kits in 27.5.
  13. Woosh

    Brexit, for once some facts.

    good read this morning: https://www.theguardian.com/commentisfree/2018/feb/20/brexit-52-ukip-leavers viable or not remains to be seen. Not long to go now,.
  14. Woosh

    Wireless battery charging for e-Bikes

    have you seen how people dock their rented Boris bikes? Why wireless charging is the future: http://batteryuniversity.com/learn/article/charging_without_wires
  15. Woosh

    Brexit, for once some facts.

    both the left and right sides of British politics nurture extreme views and extremists. That's enough for me to lose faith in politicians a long time ago.
  16. Woosh

    Brexit, for once some facts.

    We could all do with a bit more centre left policies, however, success of any new party depends on its ability to raise cash. let's see how may candidates they'll put up at the next Council elections in May.
  17. Woosh

    Conversion Kit for kids bike?

    she needs to be 14 before she's allowed to ride an e-bike.
  18. Woosh

    Brexit, for once some facts.

    New anti-brexit party has been launched today. https://renewbritain.org/
  19. Woosh

    A short review of the Rutland Cycling demo a bike for 48hrs offer

    you break it you bought it. innit?
  20. Woosh

    Wireless battery charging for e-Bikes

    because connectors are the weak points, liable to be corroded, vandalised etc.