Patent ID: 7245171

Claim:
A voltage clamping circuit for receiving a voltage from a bicycle dynamo and for applying a clamped voltage to a bicycle integrated load, wherein the voltage clamping circuit comprises: a first power transistor circuit having a first power transistor circuit input and a first power transistor circuit output, wherein the first power transistor circuit is adapted to be connected in parallel to the bicycle integrated load so that current is allowed to flow when a positive terminal of the dynamo is outputting a positive voltage; a first switching element that switches on the first power transistor circuit when voltage applied to the bicycle integrated load exceeds a predetermined voltage, and that switches off the first power transistor circuit when voltage applied to the bicycle integrated load is below the predetermined voltage; a first rectifier element connected to the first transistor circuit such that current is allowed to flow from the first power transistor circuit output to the first power transistor circuit input and current is preventing from flowing from the first power transistor circuit input to the first power transistor circuit output; a second power transistor circuit having a second power transistor circuit input and a second power transistor circuit output, wherein the second power transistor circuit is adapted to be connected in parallel to the bicycle integrated load so that current is allowed to flow when a negative terminal of the dynamo is outputting a positive voltage; a second switching element that switches on the second power transistor circuit when voltage applied to the bicycle integrated load exceeds a predetermined voltage, and that switches off the second power transistor circuit when voltage applied to the bicycle integrated load is below the predetermined voltage; and a second rectifier element connected to the second power transistor circuit such that current is allowed to flow from the second power transistor circuit output to the second power transistor circuit input and current is preventing from flowing from the second power transistor circuit input to the second power transistor output.