45results about How to "Solve EMI problems" patented technology

The present invention is wiring check system and method for cross split in mainbaord. The system includes one computer, one database and one connector. The computer includes one programmable wiring check device for creating wiring check range, obtaining and judging wiring information, reference information of the wiring layer, perforating information, same voltage shape information and capacitance information, judging whether to have wire crossing with the shape in the reference layer, and accepting qualified wiring information and returning error wiring information. The programmable wiring check device includes one wiring shape creating module, one wiring information judging module, one perforating information judging module, one capacitance information judging module and one shape information judging module. The present invention makes it possible to utilize computer system in automatic check wiring of mainboard.

The invention discloses a packaging module used for an image sensing device, an electronic component and the production method. Wherein the packaging module comprises a device chip arranged between a lower substrate and an upper substrate; a conducting layer arranged at the side wall of the lower substrate and insulated with the device chip; a protective layer arranged at the conducting layer and exposing part protective layer of the side wall of the lower substrate; a bonding pad arranged at the lower surface of the lower substrate, electrically connected to the conducting layer. The invention can resolve EMI problem without using metal casing for EMI protection, thereby reducing the production cost.

The invention discloses a zero-voltage switch forward direct-current direct-current converter which comprises a functional module M, an output isolation transformer, a primary side MOS transistor Q1 and an MOS transistor Q2; the output isolation transformer comprises a primary winding Np, a secondary winding Ns and a reset winding Nt, and the output isolation transformer is provided with an excitation inductor Lm; and the functional module M has the following two functions: one function is to control the conduction and cutoff of the primary side MOS transistor Q1, and the other function is tocontrol the conduction and cutoff of the MOS transistor Q2 according to the change of the resonance reset current or voltage. The invention further discloses a control method of the zero-voltage switch forward direct-current direct-current converter. No matter whether the output current is in an interrupted mode or a continuous mode, the output isolation transformer can be reset in a resonance mode.

The present invention provides an EMI automatic adjustment device and an EMI automatic adjustment method. The EMI automatic adjustment device comprises a crystal oscillator, a jitter clock generation unit, a PLL circuit, a spectrum spreading direction and scope configuration unit, a clock random number generation unit, a configuration random number generation unit, a configuration information control unit, a random seed generation unit, a high precision temperature ADC sensor, a change cycle configuration storage unit, a random number switch unit, a configuration information storage unit, and an EMI monitoring unit. EMI is automatically checked, or the spectrum spreading processing of PLL is carried out according to a configured EMI frequency point, the spectrum spreading operation of a clock is carried out through a configurable frequency spreading direction, thus original spectral energy spike is flattened, and an EMI problem is solved.

The invention provides an encoding and decoding method, device and system based on an LVDS (Low Voltage Differential Signaling) interface, which relates to the field of liquid crystal displays and is invented to avoid electromagnetic interference problem. The encoding method comprises the following steps of obtaining gray scale of RGB (Red Green Blue) image data in data to be encoded; determiningthe gray scale as a preset specific gray scale; setting an indicating identifier so that an decoder can obtain that the data to be decoded is the data corresponding to the preset specific gray scale according to the indicating identifier; and carrying out transposition on specific digits of binary number corresponding to the RGB image data so that the transmission frequency of the RGB image data is reduced after the transposition. The encoding and decoding method, device and system based on the LVDS interface can be used for data transmission of the LVDS interface.

The invention discloses a self-excited charge pump circuit, which comprises a boost power supply circuit for providing stable power supply, an up-pull circuit for processing UP input signals and a pull-down circuit for processing DOWN input signals, wherein the boost power supply circuit is respectively connected with the pull-up circuit and the pull-down circuit. According to the invention, the charge pump can realize certain self-excited boost without the need of an external inductive element, due to the absence of inductive elements, the EMI problem caused by an inductor-based power sourceis overcome, and the electromagnetic interference is low, the circuit is not only high in efficiency, simple in circuit structure, small in occupation area, and low in power consumption, but also canwork efficiently under the low voltage condition of the power supply.

The invention provides an electronic component of an image sensing device, comprising: a packaging module, a lens group, a non-transparent conductive layer, a printed circuit board, and solder balls; The first conductive layer, the first protective layer and the first pad; the lens group is assembled on the packaging module; the non-transparent conductive layer is arranged on the side wall of the lens group and is electrically connected to the first conductive layer; the printed circuit board, Assembled in the encapsulation module and having a ground layer disposed inside; and solder balls disposed on the first pad and electrically connected to the ground layer. The present invention can solve the EMI problem without using a metal case for EMI protection, thereby reducing the manufacturing cost.

The invention relates to an anti-electromagnetic-resistance high-power system power supply. The output end of an EMI (Electro Magnetic Interference) filtering unit is connected with a rectifying unit; a first PFC (Power Factor Correction) circuit and a second PFC circuit are connected to the output end of the rectifying unit in a parallel way; the output end of the first PFC circuit and the output end of the second PFC circuit are connected with an energy storage unit; the energy storage unit is connected with the output end through a full-bridge soft switch; a jitter frequency unit is connected with a PFC control circuit; the PFC control circuit is connected with the first PFC circuit and the second PFC circuit; the jitter frequency unit is also connected with a full-bridge control circuit; the full-bridge control circuit is connected with a delay unit; and the delay unit is connected to the full-bridge soft switch. The PFC circuit are set into two paths, so that the current of a power circuit is halved, and di / dt is reduced; the PFC control circuit is provided with the jitter frequency unit, therefore the spectral bandwidth is extended by diffusing the fundamental frequency, the peak energy of the EMI is reduced, the waveform change of the radiation EMI is gentle, the frequency range of EMI filtering is reduced, an EMI filtering circuit is simplified, the EMI inductance value is reduced and the overall efficiency is improved.

The invention discloses a switching circuit which is capable of reducing space requirement of products, and enhancing flexibility of product design and prolonging service lives of the products. Besides, the switching circuit is high in anti-disturbance performance and is reliable in performance. The switching circuit comprises a trigger button, a semiconductor control component and a switch tube. When the switching circuit is in an off-state and the trigger button is triggered, the switch tube is conducted, and the switching circuit is switched from the off-state to an on-state. Besides, the semiconductor control component is conducted, and the conducted semiconductor control component keeps the on-state of the switching circuit. When the switching circuit is in the on-state and the trigger button is triggered, current flowing through the semiconductor control component is bypassed, and the semiconductor control component is turned off. After the trigger button bounces back, the switch tube is cut off, and when the switch tube is cut off, the switching circuit is switched from the on-state to the off-state.

The invention discloses a low power consumption boost circuit for an electronic product. The low power consumption boost circuit for an electronic product comprises a pull up circuit and a pull down circuit, wherein the pull up circuit comprises a PMOS pipe P1 and a PMOS pipe P2; the pull down circuit comprises an NMOS pipe N1 and an NMOS pipe N2; a G pole of the PMOS pipe P1 is connected with an UP signal input end; and the S pole of the PMOS pipe P1 is connected with a power supply Vdd, an S pole of a PMOS pipe P3, an S pole of a PMOS pipe P4 and an S pole of a PMOS pipe P5. Without requirement for external connection with inductance elements, the low power consumption boost circuit for an electronic product can realize boosting to a certain extent; as no inductance elements exist, the low power consumption boost circuit for an electronic product overcomes the EMI problem caused by the power source based on inductance; and the low power consumption boost circuit for an electronic product has the advantages of being low in generation of electromagnetic interference, being high in efficiency, being simple in circuit structure, being small in the occupied area, being low in power consumption, and being able to work with high efficiency when the power supply is under the low voltage condition.

The invention provides an electronic equipment circuit system architecture and laser theater equipment. The electronic equipment circuit system architecture comprises a ground plane plate and at least two circuit boards installed in an electronic equipment shell, the ground plane plate is provided with a baseboard and side boards perpendicular to the baseboard, at least two circuit boards are respectively installed on the baseboard and the side boards so as to be grounded. In the electronic equipment circuit system architecture provided by the embodiment of the invention, a complete and unified large-area ground plane plate is constructed through the baseboard and the side boards so as to provide a complete ground loop for the return of an electric signal and prevent the electronic equipment from being affected by a serious EMI problem.

The computer interface card includes a circuit board, a first connector, a second connector, first conductors, a second conductor, a third conductor, an upper cover and a base. Being setup a side of the circuit board, the first connector is in use for connecting to a cable. Being setup the other side of the circuit board, the second connector is in use for connecting to the third conductor and first conductors electrically. Transmission interface between second and third conductors includes PCMCIA, Card Bus or Express Card bus interface. The first conductor is connected to ground terminal of the circuit board electrically, and the second conductor is connected to metal case of the first connector. The upper cover and the base are in clip connection so as to clip the circuit board. The upper cover and the base possess an upper metal cover and a lower metal base. The upper metal cover is connected to the first conductors and the lower metal base electrically.

The invention relates to a parallel connection jitter frequency switch power supply, which comprises a switch driving module and at least two power supply modules in electric parallel connection, wherein the switch driving module sends out at least two switch driving signals for correspondingly driving at least two power supply modules, and the switch frequencies of at least two switch driving signals are fixed and are different. The invention also correspondingly provides a parallel connection jitter frequency method for the switch power supply. Through setting fixed and different switch frequencies for each power supply module or further setting fixed and different switch frequency for power supply sub modules in the power supply module, the harmonic interference is effectively scattered, the harmonic interference energy is reduced, and the electromagnetic interference (EMI) problem of the whole switch power supply system is solved.

In the combination structure of sheet metal parts in which a first sheet metal part 31 and a second sheet metal part 41 are combined by a screw member 50 with the respective connecting surfaces being opposed to each other, a first prepared hole 32 smaller in diameter than the screw member 50 is formed in the first sheet metal part 31, and a number of first small holes 33 smaller in diameter than the first prepared hole 32 are formed around the first prepared hole 32. When the first part 31 is connected to the second part 41 by the screw member 50, a strain force is generated around the first prepared hole 32 by screwing the screw member 50 to the first hole 32, and projections formed in the first small holes 33 are brought into contact with the second part 41 by the strain force.

The present invention provides an EMI automatic adjustment device and an EMI automatic adjustment method. The EMI automatic adjustment device comprises a crystal oscillator, a jitter clock generation unit, a PLL circuit, a spectrum spreading direction and scope configuration unit, a clock random number generation unit, a configuration random number generation unit, a configuration information control unit, a random seed generation unit, a high precision temperature ADC sensor, a change cycle configuration storage unit, a random number switch unit, a configuration information storage unit, and an EMI monitoring unit. EMI is automatically checked, or the spectrum spreading processing of PLL is carried out according to a configured EMI frequency point, the spectrum spreading operation of a clock is carried out through a configurable frequency spreading direction, thus original spectral energy spike is flattened, and an EMI problem is solved.

The present invention provides a system and method for supporting the automatic opening and closing of a PCIE clock. The system includes a BMC, an in-position detection module, a clock buffer module, a hard disk backplane and a PCIE adapter card; the in-position detection module is connected with several on-board PCIEs. The clock buffer module is connected with several clock expansion interfaces; the BMC obtains the device presence status of the onboard PCIE slot, PCIE adapter slot and hard disk interface through the presence detection module and CPLD, and then uses the clock buffer module to check the device presence status of the device. The clocks of the PCIE slots, PCIE adapter slots, and hard disk interfaces that are not in place are turned on, and the clocks of the PCIE slots, PCIE adapter slots, and hard disk interfaces that are not in place are turned off. The invention automatically closes the onboard PCIE slot, the PCIE transfer slot and the clock channel corresponding to the hard disk interface where no PCIE device is deployed, saves power, avoids electromagnetic interference, and improves server stability.

The present invention discloses a quasi-resonance flyback switching power supply system. The system comprises a transformer, a power switch, and a quasi-resonance controller consisting of a jitter frequency module and a valley bottom control module. The jitter frequency module regulates the switching frequency of the power switch through regulation of a peak current flowing through a primary winding of the transformer, or regulates the switching frequency of the power switch through addition of an advance value or a delay value at the resonance valley bottom of a drain electrode voltage of thepower switch; and the valley bottom control module performs operation and processing of a size relation of the switching frequency of the power switch and a first reference frequency and a second reference frequency to obtain increased valley bottom signals or decreased valley bottom signals so as to control the power switch to convert from an off state to an on state at the predetermined resonance valley bottom of the drain electrode voltage thereof according to the increased valley bottom signals or the decreased valley bottom signals.

The invention provides an encoding and decoding method, device and system based on an LVDS (Low Voltage Differential Signaling) interface, which relates to the field of liquid crystal displays and is invented to avoid electromagnetic interference problem. The encoding method comprises the following steps of obtaining gray scale of RGB (Red Green Blue) image data in data to be encoded; determining the gray scale as a preset specific gray scale; setting an indicating identifier so that an decoder can obtain that the data to be decoded is the data corresponding to the preset specific gray scale according to the indicating identifier; and carrying out transposition on specific digits of binary number corresponding to the RGB image data so that the transmission frequency of the RGB image data is reduced after the transposition. The encoding and decoding method, device and system based on the LVDS interface can be used for data transmission of the LVDS interface.

The invention is a shielded protection device in wireless local network card, it includes protective pedestal and protective cover, the pedestal is set on the circuit board of the card and it includes the body and the frame. The frame is set at sides and it has protuberant thing. The cover includes the body and the ouches, the ouches are set at sides of the cover. The ouches have hole and clamp, the fasting hole is between the clamp and the cover. It is used to connect with the protuberant thing. The clamp wedges the protuberant thing. In this design, the pressure of the pedestal and the cover increases and the resistance is decreased, in order to avoid the leakage of electromagnetism wave.

The invention provides laser cinema equipment. A circuit system framework of electronic equipment comprises a shell; a ground plane plate is mounted on a base of the shell; the ground plane plate is provided with a bottom plate and side plates perpendicular to the bottom plate; a light source and an optical machine are mounted on the bottom plate; the circuit system framework further comprises atleast two circuit boards; the at least two circuit boards are mounted on the bottom plate and the side plates; the at least two circuit boards are grounded; and the circuit board mounted on the bottomplate is a power supply board. According to the laser cinema equipment provided by the embodiment of the invention, one complete and uniform large-area ground plane plate is formed by the bottom plate and the side plates, so that a complete ground circuit can be provided for backflow of an electric signal, and the serious EMI problem caused by the electronic equipment is prevented.