4results about How to "Reduce common mode interference" patented technology

The utility model relates to a stable power supply device for an airborne multispectral photoelectric system. The stable power supply device comprises an input filtering anti-reverse circuit, a peak surge suppression circuit, a DC-DC conversion circuit, a voltage acquisition reporting circuit and an output filtering circuit which are connected in sequence, the peak surge suppression circuit comprises a normal switching stage peak loop, an input power supply switching power-on loop and an ultrahigh peak power supply loop. The DC-DC conversion circuit comprises a first path of non-isolated output P1 and a second path of isolated output P2. According to the stable power supply device, on one hand, the dynamic response of the power supply is improved, the stability of the power supply is greatly improved, and meanwhile, the output precision and the anti-interference capability are improved.

The application discloses a zero common-mode voltage modulation method, a unit and a magnetic suspension bearing control device, and belongs to the technical field of magnetic suspension bearing control. The method comprises the following steps: calculating a normalized differential-mode voltage instruction and a common-mode voltage instruction; judging a sector number according to the differential-mode voltage instruction; calculating the normalized action time of each voltage vector according to the sector number, the differential-mode voltage instruction and the common-mode voltage instruction; calculating four duty cycles according to the normalized action time of each voltage vector, and then distributing the four duty cycles to four bridge arms according to the sector number N to generate corresponding modulation signals; and comparing the set carrier signal and the modulation signals of the four bridge arms by using a carrier comparison link to generate a PWM signal, so as to drive a magnetic bearing driving converter. The application can significantly inhibit the common-mode electromagnetic interference caused by the magnetic suspension bearing controller without affecting the normal control of the magnetic suspension bearing, and can avoid the damage to the protection bearing and the influence on the displacement sensor.

The utility model relates to the technical field of radio frequency power amplifiers, and discloses a heat dissipation inductor, a matcher and a radio frequency energy transmission device.The heat dissipation inductor is of a hollow tube structure and comprises a first sub-inductor, a connecting section and a second sub-inductor which are communicated in sequence, and the extending ends of the first sub-inductor and the second sub-inductor are used for being grounded respectively; the first end of the heat dissipation inductor is a cooling liquid input port, and the second end of the heat dissipation inductor is a cooling liquid output port. According to the utility model, the physical structure characteristics of the air core inductor can be fully utilized, heat generated by the coil due to current passing can be rapidly taken away by liquid in a limited space, cooling liquid is directly contacted with the hollow pipe structure, efficient heat dissipation is realized, a heat dissipation system occupying space does not need to be additionally arranged, the size and weight of equipment are reduced, and the cost is reduced. The equipment cost is reduced, and the reliability and stability of the matcher are ensured.

This invention discloses a SiP chip for analog image signal acquisition, comprising n dual-channel operational amplifiers, 2n differential operational amplifiers, 2n differential filter circuits, a multi-channel high-speed differential ADC analog-to-digital converter, a channel mode control module, a multi-channel digital potentiometer, a reference source, an LDO, and a low-speed operational amplifier; where n is an integer greater than or equal to 2. This invention employs SiP packaging technology to encapsulate the bare cores of the high-speed single-ended operational amplifiers, high-speed differential operational amplifiers, low-speed buffers, LDO power supplies, reference sources, ADCs, digital potentiometers, and peripheral resistors and capacitors used in the detector's analog signal processing circuit into a single SiP chip. The chip weighs approximately 1g and measures 10×17×1mm. 3 It realizes the acquisition and conditioning function of up to four analog image signals on a single SIP chip. Using this SIP chip can greatly reduce the size and weight of the circuit board.