Abstract:
An AC/DC power supply apparatus includes a hollow casing and a power conversion unit. The hollow casing includes an upright partition therein. The power conversion unit is mounted on the upright partition. The power conversion unit converts alternating current into direct current. The hollow casing includes a detachable casing plate at one side thereof relative to one side of the upright partition. The power supply apparatus of the present invention can decrease loss of current during transmission. When the power conversion unit is damaged, the casing plate can be disassembled for replacement of the damaged electronic parts of the power conversion unit.
Abstract:
A safety-protective changeover switch of a high voltage tester includes a start switch and a stop switch for controlling passage and cutting-off of high voltage. Both the switches have respectively two sets of connection points, which, through a reference voltage, pass a voltage signal to a control circuit, which then controls to cut off or to pass high voltage for protecting the safety of a user.
Abstract:
A structure for combining two sets of half-width rack-type machine cases to form a full-width machine case includes two half-width type machine cases to be combined together. Each half-width type machine case has one side plate provided with at least one positioning member protruding outward and another opposite side plate bored with receiving holes at the locations respectively corresponding with the positioning members. Thus, two half-width type machine cases abutting and juxtaposed can easily be combined into a full-width type machine case by having the positioning members of one half-width machine case engaged and fixed with the receiving holes of another half-width machine case.
Abstract:
A fixing structure for the faceplate ventilation screen of a power source supplier includes a faceplate body and at least one ventilation screen. The faceplate body has an inner side formed with at least two first extension portions protruding out vertically in the same direction, and the two first extension portions have their opposite inner sides respectively provided with a first position-limiting member extending oppositely at a location adjacent to the faceplate body. The first position-limiting members are parallel to the faceplate body, and a first gap is formed between the first position-limiting members and the faceplate body for receiving two ends of the ventilation screen. The first position-limiting members can be deformed by external force toward the faceplate body for firmly fixing the ventilation screen on the faceplate body.