16 results about "Ferrite bead" patented technology

This application provides a driving circuit, a switching circuit, and a power conversion circuit for power devices. The driving circuit controls the switching operations of N power devices connected in parallel, where N ≥ 2 and is a positive integer. The driving circuit includes a driving input circuit and a common ferrite bead. The first terminal of the driving input circuit is electrically connected to the N first terminals of the common ferrite bead, and the N second terminals of the common ferrite bead are electrically connected to the control terminals of the N power devices. The second terminal of the driving input circuit is electrically connected to the second terminals of the N power devices. By using a common ferrite bead in the driving circuit, the parasitic inductance generated by the common ferrite bead is the same, making the impedance characteristics of the driving circuits corresponding to the parallel power devices more similar, thereby effectively reducing the switching losses and damage risks generated by the power devices during the switching process.

This utility model relates to the field of display module technology, specifically a display module circuit, including: a power supply module and a driver chip. The power supply module is connected to a step-down isolation circuit, which is connected to a power filter. The power supply module is also connected to the driver chip; the driver chip is model HX8363-A03; the power filter is a CW4EL2, and the power filter consists of a filter circuit composed of capacitors, inductors, and resistors. The power filter provided in this utility model includes an LC power filter and ferrite beads. The LC power filter can filter out high-frequency noise and low-frequency ripple in the power supply, while the ferrite beads have a good suppression effect on high-frequency noise, effectively improving the stability and purity of the power supply.

This invention discloses a multi-channel signal acquisition system suitable for SERF atomic gyroscopes, belonging to the field of quantum precision measurement and sensing technology. The system employs a PT1000 platinum resistance four-wire constant current source for temperature measurement, suppressing noise through low-pass and differential-mode filtering. The optical power signal is converted into a voltage signal via a photodetector and transimpedance amplifier. The gyroscope signal is amplified by transimpedance and differential amplification to improve the signal-to-noise ratio. Multiple signals are acquired in parallel by a 32-bit ADC chip ADS1263. After digital filtering and buffering of the data by an FPGA, the data is transmitted to a host computer at a rate of 480Mbps via a USB3320C chip. The power supply system adopts an LDO cascade and ferrite bead isolation design, providing low-ripple +5V and +3.3V voltages. This invention achieves high-precision synchronous acquisition of multi-channel signals, featuring low noise and high integration, providing important support for the research and application of SERF gyroscopes.

A module is disclosed for insertion to a housing of a battery. The module includes a connector having one or more battery terminals, the one or more battery terminals electrically coupling to one or more cells,.Each of the one or more battery terminals includes a first portion, a second portion contiguous with the second portion and a third portion contiguous with the second portion. One or more ferrite beads each surround a corresponding second portion of a battery terminal of the one or more battery terminals.

This utility model discloses a cascaded fire detector base with positioning and communication functions, including a base shell and a base circuit board. The base shell has built-in bus terminals, and the circuit board integrates an RJ45 network port, a memory, a switch chip, a network transformer, a network chip, a Bluetooth chip, a power chip, an RF switch, dual antennas, and LED indicators. The base connects to the fire alarm bus via the bus terminals to power the detector and provide an interface; it connects to an external PoE switch via the RJ45 network port to achieve network power supply. Network data is transmitted to the switch chip via the network transformer, and the network chip is connected to the switch chip via the transformer to achieve data forwarding. The Bluetooth chip controls the network chip, transmitting and receiving control and positioning information via TCP / IP. The power chip reduces the high-voltage DC to 3.3V to power each module and isolates interference through a ferrite bead. The Bluetooth chip connects to the RF switch to switch the dual antennas for data transmission and reception. All modules work together to achieve positioning, communication, and cascading functions.

The utility model discloses a GPIO cross-board anti-interference circuit and a control device, the circuit comprises a master control PCB and an execution PCB, the master control PCB is provided with an MCU and a signal buffer U1, the signal buffer U1 comprises a master control buffer channel, the master control buffer channel comprises an input pin and an output pin, the input pin is connected with the MCU, the output pin is connected with a signal impedance matching resistor and a magnetic bead, and the signal impedance matching resistor is connected with the execution PCB. Then the main control PCB is connected with an output port of the main control PCB; the execution PCB is provided with a signal buffer U2 and an execution chip, the signal buffer U2 comprises execution buffer channels, the execution buffer channels are in one-to-one correspondence with the main control buffer channels, each execution buffer channel comprises an input pin and an output pin, the input pin is connected with a signal impedance matching resistor and a magnetic bead and then is connected with an input port of the execution PCB, and the output pin is connected with an output port of the execution PCB. The output pin is connected with the execution chip, and the execution chip is connected with the LED lamp; the master control PCB and the execution PCB are connected through the middle wire harness. The anti-interference performance of control signal cross-board transmission can be improved, and the circuit reliability is improved.

The utility model relates to a high beam and low beam switching circuit based on an NMOS (N-channel Metal Oxide Semiconductor) tube. The circuit comprises an interface unit, a constant current driving unit and a lamp panel unit which are connected in sequence, and further comprises a switching unit connected with the lamp panel unit, the switching unit comprises a magnetic bead B1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a triode Q1, an NMOS tube Q2, a Zener tube Z1, a voltage-regulator tube Z2, a diode D1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7.

Bias and driver circuits for modulated lasers are described. An example bias and driver circuit includes a laser, an electro-absorption optical modulator configured to modulate light output from the laser, a driver, and a power converter. The electro-absorption optical modulator is coupled between a float node and a ground node in the bias and driver circuit. The driver has an output coupled to the electro-absorption optical modulator, and the driver is configured to control the electro-absorption optical modulator to modulate the light output from the laser. The power converter is configured to maintain the float node at a potential greater than the ground node. The bias and driver circuits provide an alternative circuit arrangement for modulated lasers, including electro-absorption modulated lasers (EMLs), and are designed to operate without the use of ferrite beads or inductors in filter networks that would otherwise be coupled between the drivers and the modulators.

This utility model discloses a low-power Bluetooth circuit integrating multi-protocol communication and RF optimization, relating to the field of Bluetooth circuit technology. This low-power Bluetooth circuit includes a core chip circuit, a power supply circuit, a clock circuit, an RF module, and an interface circuit. The pins of the core chip circuit are electrically connected to the power supply circuit, clock circuit, RF module, and interface circuit, respectively. The core chip circuit includes a TLSR8258 chip supporting the SIG Mesh protocol stack and the IEEE 802.15.4 standard. The RF module forms an impedance matching network through matching components to achieve efficient signal transmission between the TLSR8258 chip and the antenna. The core chip circuit addresses the instability problem of low-power Bluetooth connections, while the RF module enhances signal strength and reduces the impact of electromagnetic interference on communication. Ferrite beads and LC filter circuits suppress power supply noise, ensuring stable operation of the RF module and digital circuits.

The utility model discloses a Hilbert fractal medium-short wave antenna, which belongs to the field of antennas and comprises a radiation part, an earth screen part and a feed part. The radiation part comprises a metal supporting rod, a Hilbert fractal structure and a wave trap, an original surface current distribution path is cut off, a cascade inductor is introduced, and the high-frequency skin effect is inhibited. The earth screen system is of a double-layer structure, a middle earth screen intercepts space waves, and a bottom earth screen is connected with ferrite magnetic beads in series to absorb common-mode noise. A balun and a pi-T mixed matching network are arranged in the feed system, and the standing-wave ratio is smaller than or equal to 1.5. The working bandwidth of the antenna is 526.5 KHz-28 MHz, the interference suppression depth is-35 dB, and the antenna is suitable for portable emergency communication and fixed monitoring stations.

This invention discloses a multi-protocol isolated wireless remote control receiver for electric rail traction locomotives, comprising: a main control unit for command parsing, protocol conversion, safety logic judgment, and output control; a wireless receiving unit with its TXD and RXD pins connected to the main control unit's USART2_RX and USART2_TX pins respectively, and its AUX pin connected to the main control unit's GPIO for status monitoring; an isolated CAN unit consisting of an ISO1050DUBR isolated CAN transceiver and a B0505XT-1WR2 isolated power supply; an isolated RS485 unit employing an isolated RS485 transceiver circuit connected to the main control unit's UART interface for compatibility with older onboard systems; a power management unit with a 24V DC input from the onboard system, stepped down to +5V and regulated to +3.3V; multiple power supplies using ferrite beads and capacitors for branch filtering; and a protection and calibration unit that calibrates output parameters using a digital potentiometer. This invention enables direct interface with the onboard control system, improving the stability, safety, and adaptability of the rail locomotive remote control system, and reducing modification and maintenance costs.

This invention discloses a fourth-order non-isolated voltage divider high-voltage direct-drive circuit for gallium nitride (GaN) power devices, comprising: a control chip, a voltage divider network, a trimming network, a clamping network, and GaN power devices. The core of the voltage divider network is a series resistor-capacitor (RC) circuit connected in series within the drive circuit. The clamping network consists of a Zener diode or transient voltage suppressor (TVPS) and a resistor connected in parallel within the drive circuit. The core of the gate voltage trimming network is a series RC circuit connected in parallel within the drive circuit, with a ferrite bead helping to suppress high-frequency oscillations. The voltage divider network and the gate voltage trimming network together form a fourth-order low-pass filter, which can complete current shunting at the moment of device startup, thereby effectively suppressing gate voltage overshoot. This circuit is fully compatible with existing silicon-based high-voltage PWM output solutions, solves the practical engineering problem of frequent transistor failures in continuous mode power factor correction circuits, effectively suppresses drive oscillations, is suitable for multi-transistor parallel schemes, and features a simple circuit structure, low cost, and strong versatility.

This application relates to the field of electronic component technologies, and to a ferrite bead, a bias circuit, an optical module, and a communication device. The ferrite bead includes: a ferrite bead body, a first fastening terminal, a second fastening terminal, and an external terminal. The first fastening terminal and the second fastening terminal are connected to the ferrite bead body, and the first fastening terminal and the second fastening terminal are configured to fasten the ferrite bead body. The ferrite bead body includes a coil structure, and the coil structure has a first electrical connection end and a second electrical connection end. At least one of the first electrical connection end and the second electrical connection end is electrically connected to the external terminal. An area of the external terminal is less than an area of the first fastening terminal and an area of the second fastening terminal.

A method for propagating signals with an automatically-tuning antenna uses an ultra-wideband antenna formed from a coaxial cable passed through a conductive tube. The center conductor of the coaxial cable is connected to an end of the conductive tube, and the shield of the coaxial cable is not electrically connected to any conductor. The arrangement of the coaxial cable with the conductive tube forms an antenna. Two ferrite beads are disposed serially on the cable outwardly from the tube, spaced apart from the tube and spaced apart from one another. An electrical signal is applied to a proximal end of the coaxial tube. The antenna is automatically tuned as the frequency of the electrical signal changes, without a need to reconfigure the physical components of the antenna.

A semiconductor device includes an insulating substrate, a plurality of semiconductor elements, a gate terminal, a printed circuit board and a passive component. The insulating substrate has a wiring. Each of the plurality of semiconductor elements has a first main electrode disposed on a first surface, a second main electrode disposed on a second surface opposite to the first surface, and a gate pad disposed on the second surface. The first main electrodes of the plurality of semiconductor elements are commonly connected to the wiring. The printed circuit board provides a gate wiring that electrically relays the gate pad and the gate terminal. The passive component includes a ferrite bead or a balance resistor. The passive component is mounted on the printed circuit board to adjust an impedance of the gate wiring.

The utility model relates to the technical field of lasers, in particular to a laser tube shell and a laser, and the laser tube shell comprises a shell and a power interface; the power interface is arranged on the shell and is used for connecting the laser and an external input power supply; the power interface is provided with a power circuit. The power supply circuit comprises a ferrite magnetic bead, a first LC high-pass filter, a first LC low-pass filter, a second LC low-pass filter, a second LC high-pass filter and a transient voltage suppression diode which are connected in sequence; the input end of the power circuit is connected with an external input power supply, and the output end of the power circuit is connected with the power input end of the laser. The utility model has the effect of improving the stability of the input current of the laser.