Abstract:
The configurations of an end of lamp life protection circuit for a ballast and a method thereof are provided in the present invention. The proposed circuit includes a voltage-dividing circuit receiving an input voltage and outputting a first and a second divided voltages and a switch apparatus raising the first divided voltage when the second divided voltage is less than a first pre-determined threshold value and turning off the ballast when the first divided voltage is higher than a second pre-determined threshold value.
Abstract:
The configurations of a two way wiring device are provided in the present invention. The proposed .device includes a case having a first side, a second side opposite to the first side, a third side formed between the first side and the second side and an open bottom passing therethrough a first conducting wire, wherein the third side includes a first side segment, a second side segment and a middle segment located between the first and the second side segments, and a conducting wire guiding pathway formed on the case and the first conducting wire passing the pathway and wired out of the case through one of the first side segment and the second side segment.
Abstract:
The configurations of a device diminishing the eddy current loss for a transformer having a gap are provided in the present invention. The proposed device includes a conductive case having an eddy current diminishing opening opposite to the air-gap and an insulator disposed between the eddy current diminishing opening and the transformer.
Abstract:
An electronic ballast includes an inductor, an output transformer, at least two switching elements, a control circuit, a clamping circuit, and at least two return circuits. The inductor is electrically coupled to a DC power supply. The control circuit is electrically connected to the inductor, the output transformer and the switching elements for controlling on/off statuses of the switching elements. The clamping circuit is electrically connected to the inductor, and limits a node voltage among the inductor, the control circuit, and the clamping circuit below a threshold value and generates an output current on condition that the node voltage is larger than the threshold value. Each of the return circuits is electrically connected to the clamping circuit and coupled to both terminals of one of the switching elements for transmitting the output current to the output transformer, thereby permitting a reverse voltage of the switching elements within a maximum allowable range of the switching elements.
Abstract:
A printing unit of a printing machine includes a pair of spaced and opposed walls which are provided with a pair of mounting holes, and an impression cylinder journalled between the opposed walls below the mounting holes. The opposed walls have a pair of aligned mounting seats mounted respectively and detachably in the mounting holes. The mounting seats are formed with a pair of aligned bushing-receiving holes therethrough corresponding with a certain size of a plate cylinder to be journalled therein so as to perform a printing action in cooperation with the impression plate. An adjustable inking apparatus is mounted above the plate cylinder and corresponds to a position of the plate cylinder so that printing ink can be supplied to the plate cylinder.