Driver circuit between electromagnetic ballast and led

摘要

To protect electromagnetic ballasts against damage, driver circuits for coupling the electromagnetic ballasts to light circuits comprising light emitting diodes are provided with rectifier bridges for exchanging first current signals with the electromagnetic ballasts and for providing second current signals to the light circuits, and with protection circuits for protecting the electromagnetic ballasts against parameters of the first current signals obtaining values larger than threshold values. The parameters may be direct-current components of the first current signals and may be average values of rectified versions of the first current signals/peak values of the first current signals. The rectifier bridges may comprise first diode elements. The protection circuits may comprise second diode elements serially coupled to the first diode elements. The protection circuit may comprise average value detectors/peak value detectors and may comprise switches for, in response to detection results, interrupting the second current signals.

主权项

1. A device, comprising:
a rectifier bridge with an input for exchanging a first current signal with an electromagnetic ballast and with an output for providing a second current signal to a light circuit comprising one or more light emitting diodes, the rectifier bridge comprising four first diode elements, and a protection circuit for protecting the electromagnetic ballast against one or more parameters of the first current signal obtaining a value larger than a threshold value, wherein the one or more parameters comprise a direct-current component of the first current signal, the protection circuit comprising four second diode elements, wherein respective first diode elements are serially coupled to respective second diode elements.