Cycle lighting dynamo and battery changeover circuit - provides direct dynamo lighting with headlamp power monitoring for changeover when power falls

摘要

The cycle lighting equipment uses a friction drive dynamo on the wheel and with a battery supply to power supplementary lamps when the cycle is stationary. A changeover control circuit monitors the current from the dynamo to the headlamp and when this drops below a predetermined level changeover to the battery supply occurs. The dynamo may also be used to supply charging currents to the battery. The dynamo (201) supplies power to the headlamp (203) and rear lamp (202). When current through the headlamp filaments drops, the control circuit (207) changes over to the battery supply (208,215) to power the headlamp (203) via a transformer (205). Am auxiliary rear light (204) is directly powered from the battery (208). Control circuit switching is a voltage dependent friction via a diode (236) in the headlamp circuit.