18 results about "Differential mode noise" patented technology

An active compensation device including a first element group including an integrated sensing / compensation unit configured to generate a sensing signal corresponding to at least one of common-mode noise and differential-mode noise on at least two high-current paths, and a second element group including a compensation control unit including a negative impedance converter and configured to generate a compensation signal corresponding to the sensing signal and provide the compensation signal to the integrated sensing / compensation unit. The compensation control unit further including a stabilization unit configured to prevent oscillation caused by the sensed noise. The first element group and the second element group are mounted on a single substrate.

This utility model discloses a frequency converter controller, including a control unit, a first filtering topology, and a second filtering topology. The first filtering topology includes a differential-mode inductor unit, and the second filtering topology includes a common-mode inductor unit. The first filtering topology is connected to the live wire, neutral wire, and protective ground wire, and receives the input signal from the power input terminal, suppresses the differential-mode noise and common-mode noise of the input signal from the power input terminal, and generates a first electrical signal. The second filtering topology receives the first electrical signal, suppresses the differential-mode noise and common-mode noise of the first electrical signal, and generates a second electrical signal. The control unit receives the second electrical signal. Because a differential-mode inductor unit is added to the first filtering topology, the number of magnetic rings can be reduced, the number of installation steps can be reduced, and costs can be optimized.

The application discloses a wideband active EMI filter circuit and a control method thereof, which comprises a high-frequency common-mode inductance module, an amplification filter module and a differential-mode filter module, the high-frequency common-mode inductance module further comprises two sampling signal output ports, and the sampling common-mode noise is connected to two input ports of the amplification filter module respectively after sampling; the output port of the amplification filter module is connected to the differential-mode filter module, and the differential-mode noise is filtered in the differential-mode filter module after the loop noise current is eliminated. Through the wideband active EMI filter circuit and the control method thereof, the compensation current signal is obtained through a novel sampling mode, the novel sampling mode is adopted, the purpose of wideband filtering is achieved, the stability of the filter is improved, meanwhile, the filter is small in size, wide in frequency band, high in stability, applicable to various space-limited scenes such as aerospace and industrial application, and the hardware design can make the matched product meet the electromagnetic compatibility requirement.

This application provides an AC switching power supply. In this AC switching power supply, the input terminal of each inverter bridge arm is connected to the output terminal of a DC switching power supply; each output terminal of the AC switching power supply is connected to the output terminal of the corresponding inverter bridge arm. In this application, since the common-mode noise of at least two DC switching power supplies cancels each other out, the common-mode noise of the AC switching power supply is suppressed. Furthermore, since in the prior art, the drive signal frequencies of each DC switching power supply in the AC switching power supply are the same, i.e., the number of noise sources at the same frequency point is equal to the number of DC switching power supplies, when the number of DC switching power supplies is the same, the noise sources of this AC switching power supply at the same frequency point will not exceed those in the prior art. Therefore, the differential-mode noise of this AC switching power supply can at least remain unchanged. In summary, the AC switching power supply provided in this application suppresses its own EMI.

The invention discloses an improved XY capacitor plate, and belongs to the field of electronic circuits, the improved XY capacitor plate comprises an X capacitor connected in parallel between a live wire and a zero line, and a first Y capacitor and a second Y capacitor respectively connected between the live wire and a ground wire and between the zero line and the ground wire, and the first Y capacitor and the second Y capacitor adopt symmetrical design and jointly form a pi-type filtering structure; compared with the prior art, differential mode and common mode noise can be efficiently suppressed, the harsh EMC requirement of a ship is met, the safety and reliability of the circuit are greatly improved through the application of the safety capacitor and the redundancy design of the Y capacitor, the electric shock risk caused by element failure is avoided, and part of the filtering function can still be reserved when a single point of fault occurs.

The invention discloses equipment for quickly positioning differential and common mode interference of electronic equipment for a CE102 test item, and belongs to the technical field of electromagnetic compatibility test. Comprising a metal shell, a differential-mode noise suppression module and a common-mode noise suppression module are arranged in the metal shell, four banana sockets and four control switches are arranged on a panel of the metal shell, the banana sockets are used for being connected with a test loop, and the control switches comprise two common-mode control switches and two differential-mode control switches. The two common-mode control switches are respectively connected with the input end and the output end of the common-mode noise suppression module, the two differential-mode control switches are respectively connected with the input end and the output end of the differential-mode noise suppression module, and the control switches are used for selectively connecting the differential-mode noise suppression module or the common-mode noise suppression module into a test loop. According to the invention, the interference type can be rapidly judged, multiple instrument functions are integrated, visual operation is realized through switch switching and light indication, the test efficiency and the positioning accuracy are improved, and on-site rapid troubleshooting is facilitated.

The invention relates to a filter, an inverter and a vehicle, the filter comprises a connecting busbar, a magnetic ring and a capacitor, the connecting busbar is used for being electrically connected with an external electronic element, the magnetic ring sleeves part of the connecting busbar, the capacitor can be electrically connected with the connecting busbar, the capacitor comprises a first capacitor and a second capacitor, and the first capacitor and the second capacitor are electrically connected. The first capacitor can be matched with the magnetic ring to form a first differential-mode filter circuit, the second capacitor can be matched with the magnetic ring to form a second differential-mode filter circuit, and the frequency of differential-mode noise suppressed by the first differential-mode filter circuit is different from that of differential-mode noise suppressed by the second differential-mode filter circuit. According to the filter, the first capacitor and the second capacitor are arranged, the frequencies of suppressed noise are different, and a multi-stage and broadband noise absorption network is formed, so that the noise of different frequencies can be suppressed, the frequency of suppressing the noise can be widened, and applicable scenes can be increased.

The invention relates to a filter, an inverter and a vehicle, the filter comprises a connecting busbar, a first magnetic ring, a second magnetic ring and a capacitor, the connecting busbar is used for being electrically conducted with an external electronic element, the first magnetic ring sleeves a part of the connecting busbar, the second magnetic ring sleeves a part of the connecting busbar, and the capacitor is electrically connected with the first magnetic ring and the second magnetic ring. The capacitor can be electrically conducted with the connecting busbar, the first magnetic ring is a common-mode magnetic ring, the first magnetic ring can be matched with the capacitor to form a common-mode filter circuit, the second magnetic ring is a differential-mode magnetic ring, and the second magnetic ring can be matched with the capacitor to form a differential-mode filter circuit. According to the filter, common-mode noise and differential-mode noise are jointly suppressed, the filter can be applied to a high-voltage direct-current system, the first magnetic ring and the second magnetic ring are independent of each other and are designed in a split mode, and measurement of differential-mode inductance and impedance and measurement of common-mode inductance and impedance can be decoupled.

The utility model discloses a kind of multi-stage filtering integrated module of composite structure, electric drive system and vehicle, belong to new energy electric car electric drive technical field, multi-stage filtering integrated module of composite structure includes upper cover fastener, lower fastener, capacitor filter module, magnetic filter module, bus copper bar, external copper bar, connecting copper column;The magnetic ring is sleeved in the outer circumferential surface of copper bar along copper bar extension direction;Capacitor filter module includes PCB board and the capacitor welded on PCB board, capacitor filter module is crimped with bus copper bar by connecting copper column, another grounding hole is additionally provided on PCB board, ensure that the Y capacitor of connecting bus copper bar and ground can have good electrical contact with metal shell;The multi-stage filtering integrated module of composite structure can guarantee its effective suppression new energy electric car's common mode and differential mode noise in electric drive, while guarantee the simplicity of assembly and the stability of fastening, filtering integrated module meets national standard, with the characteristics of better electrical and structural stability.

The invention discloses a signal acquisition circuit and a signal acquisition method of an accelerometer, and belongs to the technical field of circuits. The accelerometer generates three-axis acceleration current signals; the signal conditioning module is used for converting the acceleration current signals of the three axes into voltage signals, and conditioning each path of voltage signals by using an operational amplifier and a rail-to-rail amplifier to obtain conditioning signals of the three axes; the signal acquisition module carries out triple redundancy sampling on the conditioning signals of the X axis and the Y axis and carries out double redundancy sampling on the conditioning signals of the Z axis; the controller calculates the dynamic weight of each path of sampling signal of the X axis and the Y axis and calculates optimization signals of the X axis and the Y axis according to each path of sampling signal and the dynamic weight, and the dynamic weight corresponding to each path of sampling signal is related to errors of sampling channels of the other two paths of sampling signals; and calculating an optimized signal of the Z axis for the two paths of sampling signals of the Z axis. According to the invention, the interference of common-mode noise and differential-mode noise can be reduced, and the precision influence caused by zero drift and performance difference between channels can be reduced.

The utility model discloses an EMI (Electro-Magnetic Interference) suppression circuit, comprising a low-frequency common-mode suppression module which is used for suppressing power-frequency harmonic waves and low-frequency conduction noise and is composed of a three-phase ferrite core common-mode inductor L1; the differential mode discharge module is used for discharging differential mode noise and is composed of an X capacitor C1, an X capacitor C2 and an X capacitor C3; the high-frequency common-mode suppression module is used for suppressing high-frequency switching noise and diode reverse recovery ringing and is composed of a three-phase common-mode inductor L2; the common-mode grounding module is used for guiding common-mode noise to be discharged through a ground wire and is composed of a Y capacitor C4, a Y capacitor C5 and a Y capacitor C6, one end of each Y capacitor is connected with the three-phase line, and the other end of each Y capacitor is in common ground. According to the EMI suppression circuit, through collaborative design of the two stages of common-mode inductors, the differential-mode discharge module and the common-mode grounding module, the differential-mode inductor is omitted, the common-mode noise suppression capability is ensured, the circuit size is reduced, and the cost is saved.

The invention relates to an electrical circuit (6) comprising: two input terminals (13) connectable to a DC voltage; a control unit (7p, 7s); a first switching arm (B1, B3) comprising two controllable electronic switches (12) connected in series on either side of a first midpoint, the switches of the first arm being controlled by the control unit according to a first duty cycle; a second switching arm (B2, B4) comprising two controllable electronic switches (12) connected in series on either side of a second midpoint, the switches of the second arm being controlled by the control unit according to a second duty cycle; inductance units (10, 20) for contactless energy exchange consisting of inductors, mounted between first and second midpoints (14, 15), the first arms (B1, B3) and the second arms (B2, B4) being mounted in parallel, the circuit comprising a filter unit (11, 21) for filtering common and / or differential mode noise.

This invention relates to an MLVDS receiver circuit based on BiCMOS technology, comprising a common-mode converter circuit, a pre-amplifier circuit, type 1 and type 2 control circuits, a hysteresis comparator circuit, and a differential-to-single-ended converter circuit. The common-mode converter circuit compresses the input signal with a wide common-mode range; the pre-amplifier circuit identifies and amplifies the compressed differential signal; the type 1 and type 2 control circuits control the operating mode of the MLVDS receiver; the hysteresis comparator introduces hysteresis while amplifying the differential signal, suppressing differential noise and providing anti-interference capability; the differential-to-single-ended converter circuit converts the differential signal to a single-ended signal. This invention provides an MLVDS receiver circuit based on BiCMOS technology. This circuit, implemented using BiCMOS technology, can achieve a wide common-mode range input through a resistor divider network, and simultaneously implements both type 1 and type 2 operating modes, meeting the requirements of the MLVDS standard.

The application belongs to the technical field of power electronics, and relates to a CM-DM integrated active EMI filter with adjustable common-mode and differential-mode attenuation, comprising: a first noise attenuation circuit and a second noise attenuation circuit; the first noise attenuation circuit and the second noise attenuation circuit are both composed of a detection link, an amplification link and an injection link; the application takes a negative bus as a reference, two operational amplifiers use the same power supply system, and common-mode and differential-mode noises can be simultaneously and effectively attenuated through constructing a proper compensation current path, and common-mode and differential-mode insertion losses can be respectively changed by changing the gains of the first and second noise attenuation circuits; therefore, the application realizes the separate adjustment of common-mode and differential-mode noise attenuation capabilities.

Provided is a noise filter that does not cause magnetic saturation by using a magnetic core in a circuit through which a large current flows. A large current is shunted to a plurality of conductors, and a noise filter using a magnetic core is provided in each of the plurality of conductors. The magnetic core may be configured such that one electrical conductor passes through a plurality of different magnetic cores, and the frequency band can be broadened by varying the characteristics of the plurality of magnetic cores. It is also possible to provide a core-type noise filter capable of coping with common-mode noise in addition to blocking differential-mode noise.

The invention provides a PCB common-mode and differential-mode integrated adjustable inductance filter, and belongs to the technical field of circuit magnetic filtering. The invention discloses a PCB common-mode and differential-mode integrated adjustable inductance filter, and the filter comprises a PCB substrate. The magnetic core structure comprises two split type magnetic cores which are oppositely arranged, and the two split type magnetic cores are detachably buckled on the PCB substrate; the winding structure is arranged on the PCB substrate in a same-direction common-mode mode, and the filtering frequency band and the impedance can be adjusted by adjusting the air gaps between the middle columns and the side columns of the two split type magnetic cores. The two split type magnetic cores are combined together to form the common-mode and differential-mode integrated magnetic core, the winding structure is wired along the PCB substrate in the same-direction common-mode mode, on one hand, differential-mode components with different impedances can be designed based on adjustment of air gaps between the middle columns and the side columns of the split type magnetic cores; and on the other hand, common-mode filtering with different inductance values can be obtained based on different winding structure turn ratios, so that impedance can be conveniently designed for different circuits to effectively suppress common-mode and differential-mode noise, and the common-mode and differential-mode filter can be flexibly applied to different circuits.

The utility model discloses a kind of multi-stage filtering integrated devices, electric drive system and vehicle, belong to new energy electric car electric drive technical field, multi-stage filtering integrated devices include structural member, multiple magnetic elements, multi-stage capacitor filter unit and copper bar;The copper bar is fixed on structural member, and copper bar end is used for connecting load by lead through magnetic element, other magnetic element is set on copper bar and is connected with structural member;Multi-stage capacitor filter unit is interval arranged along the arrangement direction of copper bar, and capacitor filter unit includes PCB board, and capacitor is set on it, PCB board is across set on the top of copper bar, grounding point of PCB board is embedded with ground terminal, and the pin of capacitor is respectively connected with copper bar and ground terminal of PCB board;The multi-stage filtering integrated device can effectively suppress common mode and differential mode noise of electric drive in new energy electric car, filtering performance meets international standard, and has the characteristics of strong electrical stability and strong structure.

The invention relates to the related technical field of circuit substrates, and discloses a DCDC common-mode noise suppression circuit for an electronic control unit, which comprises the electronic control unit, and the electronic control unit distributes a power supply through a DC-DC converter and is a system block diagram of an electric power steering electronic control unit. The whole vehicle power input supplies power to the power management chip, the driving chip and the motor driving circuit. The power supply management chip is responsible for distributing a power supply and supplying power to the CAN transceiver, the microprocessor, the motor angle sensor, the TAS sensor and other chips; the microprocessor is interconnected with other chips; through the synergistic effect of the normal filter and the common-mode filter, in combination with the ground plane segmentation design and the conduction effect of the conductive metal screws, efficient suppression of differential-mode noise and common-mode noise is realized near a noise emission source, the electromagnetic disturbance of an electronic control unit is effectively reduced, and the noise suppression effect of the electronic control unit is improved. And the electromagnetic compatibility of the electronic control unit and the whole vehicle is improved.