173results about How to "Improve electromagnetic interference" patented technology

A flat panel display including a first mold frame and a bottom chassis. The first mold frame includes a first base plate with an inside region opened and a plurality of first coupling members protruding from a rear side of the first base plate. The bottom chassis includes a second base plate, a plurality of sidewalls extending from the second base plate and a plurality of second coupling members formed on the plurality of sidewalls and coupled with the plurality of first coupling members.

The switching frequency of an LLC converter is controlled by a control unit to which a feedback circuit provides a first current dependent upon the output voltage of the converter. An oscillator circuit produces a sawtooth waveform at a frequency dependent upon the first current, up to a limit equal to a second current set by a resistor. Two complementary switch control signals are produced for controlling two switches of the converter for conduction in alternate cycles of the sawtooth waveform. A timer produces dead times between the two complementary switch control signals in dependence upon the second current. Another resistor provides a current constituting a minimum value of the first current, and a charging current of a capacitor in series with a resistor modifies the first current for soft starting of the converter.

A semiconductor package which can be stacked to form a package stack that includes a semiconductor chip with bonding pads, a board having contact pads on its upper surface and bump pads on its lower surface, a heat spreader attached to the rear side of the semiconductor chip and covering the upper surface of the board, and external contact terminals including ground terminals and signal terminals formed on the bump pads. The contact pads of the board include ground contact pads connected with the ground terminals and signal contact pads connected with the signal terminals. The heat spreader includes indented parts to expose the signal contact pads and protruded parts to cover the ground contact pads which are exposed through holes formed on the protruded parts on the peripheral part of the heat spreader. The semiconductor package can alternatively have the heat spreader attached to the lower surface of the board.

An electronic appliance includes a circuit board mounted with an electronic-circuit component. The circuit board is covered with a shield, and a metallic heat-dissipating member is arranged on the electronic-circuit component. The shield is grounded on the circuit board, and arranged such that at least one of the surfaces is in the vicinity of the heat-dissipating member. The heat-dissipating member is grounded on the circuit board by a ground member, and at the periphery of the ground member, magnetic members are arranged.

The invention discloses a high-voltage battery charging system architecture of an electric automobile. The high-voltage battery charging system architecture is arranged in a car body and is used for receiving electric energy of alternating current input voltage so as to charge a high-voltage battery unit in the car body. The high-voltage battery charging system architecture comprises a rectification circuit, a power factor correcting circuit, and a non-isolated type DC-DC converting circuit, wherein the rectification circuit is connected with a common connection point and is used for rectifying the alternating current input voltage to generate rectified voltage; the power factor correcting circuit is connected with the rectification circuit and a bus, and is used for improving power factors and generating bus voltage; the non-isolated type DC-DC converting circuit is connected with the power factor correcting circuit and the high-voltage battery unit, and is used for converting the bus voltage into high-voltage charging voltage to charge the high-voltage battery unit; and an electric energy transmission path of the non-isolated type DC-DC converting circuit does not comprise a transformer. The high-voltage battery charging system architecture of the electric automobile can effectively reduce unnecessary consumption of a circuit to ensure that the charging time of the electric automobile or a hybrid power automobile is comparably short, the manufacturing cost is lower and the efficiency is higher; besides, the high-voltage battery charging system architecture of the electric automobile has the advantages of lower charging loss, shorter charging time and the like.

This invention discloses a combinatorial mobile hotspot device, a network service provision method thereof, a network access device and a wireless service power supply device. The network access device has a mobile internet access ability to provide an external host machine connecting to a wide area network through the network access device when the network access device is selectively and electrically coupled to the external host machine. A mobile hotspot device is formed while the network access device is electrically coupled to the wireless service power supply device. The wireless service power supply device supplies the power to the network access device. Further, by a wireless local network transceiver, a plurality of electronic devices in the hotspot covering region are able to connect to wide area network through the wireless access point service provided by the network access device.

Disclosed herein is a five-level rectifier that includes first, second, third, fourth power semiconductor switches, first and second DC bus capacitors, a phase capacitor, and first, second, third and fourth diode modules. The first, second, third and fourth diode modules are connected in series, the first and second DC bus capacitors are connected in series, and the second and third power semiconductor switches are connected in series. The first diode module is connected to the first DC bus capacitor and the first power semiconductor switch, and the fourth diode module is connected to the second DC bus capacitor and the fourth power semiconductor switch. The phase capacitor has a terminal connected to the first and second power semiconductor switches, and another terminal connected to the third and fourth power semiconductor switches.