Patent application number | Description | Published |
20140209586 | PORTABLE IGBT ARC WELDING MACHINE - A portable IGBT (Insulated Gate Bipolar Transistor) of high reliability, compact size, and low cost includes a main circuit to which a control circuit and an auxiliary power supply circuit are connected. The main circuit includes, in sequence, an input rectifier filter circuit, an inverter circuit, a high-frequency primary transformer, and a secondary output rectifier circuit. The control circuit includes a PWM regulation circuit, an IGBT driving circuit, a current feedback circuit, and a current setup circuit. The inverter circuit includes a full-bridge hard switching structure, which has IGBTs constituting bridge arms that are sequentially conducted, so that their alternating conduction converts direct current into high frequency square wave alternating current, which flows through the high-frequency primary transformer and is then subjected to rectification to supply an output of low voltage direct current. Each IGBT is connected in parallel to resistor and capacitor, which constitute a peak voltage absorption circuitry. | 07-31-2014 |
20150117699 | MAGNETIC ASSEMBLY FOR SPEAKER - A magnetic assembly for a speaker is disclosed. The magnetic assembly includes a yoke, a magnet module installed on the yoke, and a pole module mounted on the magnet module. The magnet module includes a main magnet, a first secondary magnet and a second secondary magnet, the pole module includes a main pole plate, a first secondary pole plate and a second secondary pole plate. The first secondary pole plate includes a first pole protrusion extending perpendicularly from an edge thereof, and the second secondary pole plate includes a second pole protrusion extending perpendicularly from an edge thereof. The first pole protrusion and the second pole protrusion are located facing two opposite side walls of the main magnet respectively. | 04-30-2015 |
20150185730 | MULTI-PROCESS AUTOMATIC MACHINE SYSTEM - A multi-process automatic machine system is configured to machine different surfaces of a workpiece. The multi-process automatic machine system includes at least two first robots, at least two first machining devices, and at least one transfer table positioned between the at least two first robots. Each first machining device is positioned adjacent to one of the at least two first robots. One of the at least two first robots is configured to translationally move the workpiece to the at least one transfer table after the first machining surface being machined. The at least one transfer table is configured to rotate the workpiece. Another one of the at least two first robots is configured to translationally move the workpiece from the at least one transfer table to the corresponding one of the at least two first machining device. | 07-02-2015 |
20160021447 | Speaker Box - A speaker box is disclosed. The speaker box includes a housing including a bottom wall, and a speaker unit accommodated in the housing. The speaker unit includes a magnetic circuit unit having a lower plate, a magnet on the lower plate, an upper plate on the magnet, and a magnetic gap. The lower plate abuts against the bottom wall for forming a space communicated with the magnetic gap. Thus, the air pressure in the magnetic gap is balanced, and the low frequency sound performance is improved. | 01-21-2016 |
20160112804 | MAGNETIC ASSEMBLY AND ELECTRO-ACOUSTIC TRANSDUCER USING SAME - An magnetic assembly and an electro-acoustic transducer using the same are disclosed. The magnetic assembly includes a lower plate, a main magnet positioned on a central portion of the lower plate, an auxiliary magnet positioned on a periphery portion of the lower plate, surrounding the main magnet with space, and having an inner surface facing the main magnet and an outer surface opposite to the inner surface, and a first pole plate. The first pole plate includes a base body attached on the auxiliary magnet, and a magnetic conduction member connected with the base body and overlapping the outer surface of the auxiliary magnet for forming a loop of magnetic flux together with the base body and the lower plate as well as the auxiliary magnet. | 04-21-2016 |