Osram 50 → 225W Light Transformer, 230 → 240V ac, 11.3V ac

OSRAM HALOTRONIC PROFESSIONAL HTL Transformer

Introducing the HALOTRONIC PROFESSIONAL HTL, a dimmable on the leading and trailing edge, electronic transformer. It protects from short-circuit, overtemperature and overload (electronically reversible) and has electrical isolation between the primary and secondary sides. Switching between the electronic transformer and the lamp is not permitted. With high levels of energy efficiency, this transformer has many applications but is particularly good for effect and accent lighting, object lighting and furniture luminaires (recessed and surface-mounted). It is also good for living rooms, conference and event rooms, shop lighting and restaurant lighting. High efficacy means that little power is lost, and HALOTRONIC PROFESSIONAL HTL covers a large temperature range. Protective operation throughout the partial-load range prolongs lamp life, and you can through-wire on the primary side.

Standards

EN 55015, EN 61000-3-2, EN 61547, EN 61047

Low Voltage Lighting Transformers

Dimming Methods (where applicable):
Leading Edge:
The control device is either a thyristor or triac which blocks power until they are switched on by the control signal. At that point the current flows almost instantaneously and continues to flow until the end of the half cycle of the mains waveform. When the signal reaches zero, the device turns off and no more current is passed until it is triggered again. Turning the power on and off in this manner averages out creating a constant intensity level and by altering the precise trigger point over a period of time the lamp can be dimmed.

Trailing Edge:
Since this method of dimming uses transistor technology it is not limited to just switching, therefore current can be controlled gradually. Transistors can be programmed to pass current at the start of each half cycle, and gradually switch off later. This will control the full amount of power reaching the lamp without the side effects of a step increase in current.