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I'm not an electronics whiz, by any stretch of the imagination, but I'm very interested in this topic and would love to start discussion.
I would start from the mechanical angle first. Rather than have some circuitry decide when to apply just the regenerative brake and when the full friction power of the brake was needed, I would rig two brake lines on one brake lever. The first would kick on with minimal pressure, pushing a caliper with an oversized dynamo on it. A big wheel, gear ratios, making this part work would take fiddling, but the goal is obviously to transfer the mechanical energy of the wheel into the dynamo as efficiently as possible. If depressed all the way, the friction brake line would come into play. There have been a number of dynamo bike prototypes scrapped because of dynamos that took away too much wheel inertia, and their downfall is exactly the asset this project needs.
From there, I'd start with a rectifier bridge capable of handling the voltage loads of the dynamo. I'm assuming that the electrical motor will be turned on by the user, rather than always on. Here's where I'll show how green I am to this: I don't know quite where to go next. I would lift and modify circuits from some other projects to suit your voltages.
Nick another answer use a relay to switch from battery power to a load resistor to the motor when braking
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A circuit requires two fundamental parts in its most elementary state. Which is a source of energy and a load that will convert the energy in to work. But not all applications with electricity would require work to be done. In the field of digital systems there are a use for electricity to automate the process of decision making and data management. This type of electrical circuits require: *Input source of data or signal often as part of a HMI (Human Machine Interface). *Output of data or signal often as part of a HMI. *Source of electrical energy. *Logical process. *Storage of data. These types of circuits called digital circuits can be combined with other types of electrical circuits to perform tasks for industrial automation, communication, data processing like with computers and calculators. Most of consumer electronics are made from carefully designed circuits that consist of resistors, capacitors, transistors, integrated circuits, diodes, switches, transducers, transformers and pre-manufactured modules. The complex structures that these devices are applied to, can result in precise and very useful functions for the benefit of humans and nature. In the design of electrical circuits, the great challenge is to create a perfect and reliable electrical function from imperfect and fragile components. The design of basic electrical circuits should always challenge features that improve safety, functionality, reliability, economy and energy efficiency.
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