Dynamo Current and Voltage Regulator by TL084

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Let’s start analyzing the circuit in idle condition, when the engine is stopped. The battery voltage at B+ cannot pass to D+, because D1 blocks it. D+ is at ground level, because of the low resistance of the dynamo between D+ and D-. Q1 is biased off, which leaves the negative side of the entire OpAmp circuit floating. So the complete control circuit will float at +12V, and in this way will bias Q4 fully on. Q4 then holds DF down to ground, ready for dynamo startup, and for using the dynastarter as a starter.

There will be no power consumption other than the very low leakage of some components. Q1 is off, D1 and D5 are reverse biased, Q3 is off, D7 stays far below its conduction voltage, Q4 has an insulated gate, C1 and C8 supposedly don’t conduct DC… Actually, the leakage in C8 is the main current drain, but this leakage gets down into the microampere range when the circuit is connected permanently to the battery. So, this circuit consumes essentially no idling current, while keeping DF grounded for easy dynamo startup.

Read More Source:
http://ludens.cl/Electron/dynareg/dynareg.htm
Thank you.

This entry was posted on Saturday, February 9th, 2008 at 5:49 pm and is filed under Electronic Control, Power supply. You can follow any responses to this entry through the RSS 2.0 feed.