56results about How to "Avoid harmonics" patented technology

A high-frequency module is connected to a switch port and a switch IC including an antenna connection port and a plurality of switch ports. The high-frequency module includes a signal path that outputs transmitting signals having a predetermined frequency band to the switch IC, a module port connected to the signal path and to which a duplexer and a transmitter circuit are connected, and a harmonic branch circuit that is provided on the signal path and allows a harmonic of the transmitting signal to escape to ground.

The invention relates to a converter circuit (1), comprising a direct-voltage connection (13); at least one alternating-voltage connection (12); and at least one phase module (10), wherein the phase module (10) has a series connection of an upper and a lower converter valve (11a, 11b), wherein an electrical link between the upper and the lower converter valve (11a, 11b) is the alternating-voltage connection (12), wherein the connections (14a, 14b) of the phase module (10) are electrically connected to the direct-voltage connection (13), wherein the upper and the lower converter valve (11a, 11b) each have at least two sub-modules (20, 30), which are arranged electrically in series, wherein the sub-modules (20, 30) have at least one capacitor (42), at least one power semiconductor (41), and a control assembly (50) for controlling the power semiconductors (41), wherein at least one converter valve (11a, 11b) has a sub-module (30) suitable for linear operation, and wherein the converter circuit (1) has a control assembly (50), which enables the linear operation of the sub-module (30) suitable for linear operation. The invention further relates to a method for operating a converter circuit (1) according to the invention, wherein at least one sub-module (30) is operated in linear operation in at least one converter valve (11a, 11b).

The invention relates to a fan cooling control device which comprises a temperature detection sensor, a plurality of fans and a PLC (Programmable Logic Controller) module which is connected with the temperature detection sensor and is suitable for controlling working of the fans with the corresponding number and corresponding rotational speeds of the fans according to the external temperature. According to the fan cooling control device disclosed by the invention, the traditional relay circuit is replaced by the PLC module, so that the defects of tedious wiring and high failure rate of relays are avoided; and the fan number and the rotation number are controlled according to the temperature, the fans do not need to started or a few fans are started with low revolution in winter with lower temperature, while all the fans need to be started in summer with high temperature, and the revolution is increased according to the specific temperature, so that a great deal of power is saved, and the service life of a motor is also prolonged.

The invention provides a no-crystal clock generation system of a broadcast system-on-chip. The system comprises a high-frequency inductor-capacitor digital control oscillator, a first frequency divider, a frequency divider group, an analog phase-locked loop, a second frequency divider, a receiver and a digital signal processor. The first frequency divider is used for producing and outputting a reference clock of the analog phase-locked loop; the frequency divider group is used for producing and outputting various different digital clocks; the analog phase-locked loop is used for receiving the reference clock and generating oscillation frequency; the second frequency divider is used for carrying out frequency division on the frequency output by the analog phase-locked loop and generating needed local oscillating frequency; and the digital signal processor is used for receiving and analyzing the signal frequency output by the receiver to obtain frequency deviation of the local oscillating frequency and the received signal frequency, and the high-frequency inductor-capacitor digital control oscillator is adjusted based on the frequency deviation. According to the no-crystal clock generation system, the clock needed in a chip can be realized without off-chip crystal, and stable frequency output can be achieved.