Invention Grant
US08405319B2 Universal dimmer 有权
通用调光器

Universal dimmer
Abstract:
Various embodiments of a universal dimmer are disclosed. In one embodiment of a universal dimmer, a power limiting switch is connected to an input voltage. An output driver in the universal dimmer includes a power input and a load path, with the power input being connected to the input voltage. A variable pulse generator includes a control input and a pulse output, with the control input connected to a control input of the power limiting switch. The pulse output is connected to a control input of the power limiting switch. The variable pulse generator is adapted to effectively vary a duty cycle at the pulse output. The universal dimmer also includes a load current detector having an input and an output. The load current detector input is connected to the output driver load path. The load current detector output is connected to the variable pulse generator control input. The variable pulse generator and the load current detector are adapted to limit the effective duty cycle when a load current reaches a maximum current limit to substantially prevent the load current from exceeding the maximum current limit.
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