33 results about "Voltage spike" patented technology

This invention relates to the field of gallium nitride (GaN) technology and discloses a GaN and MOS power module for a robot digital control unit, comprising a substrate, a front GaN structure, and a back GaN structure. The front GaN structure and the back GaN structure are located on opposite sides of the substrate, with an intermediate dielectric deposited between them. The front GaN structure includes a front buffer layer, a front GaN layer, a front aluminum gallium nitride layer, a front source electrode, a front gate electrode, a front P-type GaN layer, and a front drain electrode. This invention achieves normally-off operation through the front enhancement-mode GaN structure to improve system safety, and utilizes the back depletion-mode structure to provide high current drive capability. Simultaneously, the integrated capacitor structure formed by the front electrode, intermediate dielectric, and back electrode effectively absorbs voltage spikes and suppresses electromagnetic interference, thus enabling this power module to combine high-speed switching, low loss, and high reliability in a robot digital control unit.

This invention belongs to the field of power electronics technology, specifically relating to a single-phase high-frequency chain inverter and its modulation method, comprising: a primary-side full-bridge inverter circuit, including primary-side switching transistors K1, K3, K2, and K4; a secondary-side full-bridge frequency converter, including secondary-side switching transistors S1a, S2a, S3b, S4b, S1b, S2b, S3a, and S4a; a high-frequency transformer for connecting the primary-side full-bridge inverter circuit and the secondary-side full-bridge frequency converter; a voltage spike suppression circuit, including D1, D3, D2, and D4; the input terminal of the full-bridge circuit is connected in parallel with the secondary winding of the high-frequency transformer, and the output terminal of the full-bridge circuit is connected to a DC power supply.

This invention discloses an anti-interference economic relay and its operating method, including a relay coil, armature, iron core, contacts, and an anti-interference module. The anti-interference module is a resistor-capacitor (RC) absorption circuit, which consists of a resistor and a capacitor connected in series. The anti-interference module is connected in parallel with the relay coil, with one end connected to the first terminal of the relay coil and the other end connected to the second terminal. When the current in the relay coil is cut off, the RC absorption circuit provides a release path for the reverse induced electromotive force generated by the relay coil, absorbing and dissipating its energy and suppressing voltage spikes. By effectively suppressing the induced voltage across the relay coil, this invention can eliminate malfunctions caused by the induced voltage at the source, thereby ensuring the reliable operation of the relay and improving the stability of the entire control system.

This invention relates to the field of power electronics technology and discloses a simulation-optimized thyristor RC snubber method and circuit. The method includes: building a precise physical model containing stray parameters in a simulation environment; first, simulating and obtaining turn-off voltage spikes and dv / dt data without the snubber circuit connected; then, connecting an RC network and performing simulation comparisons with multiple sets of parameters for the resistor and capacitor; selecting the optimal RC parameters based on voltage suppression effect, dv / dt limitation, and resistor power consumption, and finally determining the device model. This invention overcomes the coarseness of traditional empirical formulas and the inefficiency of trial and error methods, offering advantages such as high design accuracy, intuitive process, and outstanding efficiency. It effectively avoids problems of conservative parameters or insufficient protection, achieving the best balance between cost, size, and performance while ensuring the safe operation of the thyristor. It is applicable to thyristor protection design in various power electronic systems; it quickly selects the optimal parameter combination that meets the requirements of voltage suppression and dv / dt limitation, shortening the product development cycle.

A multi-phase switched capacitor converter is disclosed for converting a first voltage into a second voltage, or vice versa. The converter includes two sub-converters connected in parallel between an input voltage and an output voltage. Each sub-converter comprises a flying capacitor and a plurality of switches. Power conversion is performed by periodically switching the electrical connection between the flying capacitor and the voltage sources, between a first switching phase and a second switching phase. The two sub-converters alternately switch between a first system state and a second system state in a periodic manner. During the transition between the first and second system states, an overlapping system state is inserted, wherein both sub-converters are simultaneously in the first switching phase, thereby ensuring continuous current flow and reducing voltage spikes.

A method for detecting the presence or absence of a magnetic measurement probe at a measurement initiation location within an electromagnetic coil of an ophthalmic instrument includes: applying a transient current pulse to the electromagnetic coil; detecting a back electromotive force voltage spike induced in the electromagnetic coil by the current pulse; evaluating the decay behavior of the back electromotive force voltage spike; and correlating the decay behavior of the back electromotive force voltage spike with the presence or absence of the measurement probe at the measurement initiation location.

This application provides a driver chip protection circuit, a driver circuit, and a circuit control method. The circuit includes a clamping module, a lossless energy conversion module, a switching module, and a control module. The output terminal of the driver chip is connected to the controlled terminal of the power switching device via the clamping module. The input terminal of the lossless energy conversion module is connected to the power supply terminal of the driver chip, and its output terminal is connected to the clamping point of the clamping module via the switching module. In this example, the control module controls the switching module to maintain the voltage at the clamping point at a preset threshold, which reduces device failure caused by voltage spikes generated by the high-speed switching of the power switching device, thereby improving the reliability of the driver circuit.

This invention discloses an aircraft power supply characteristic test parameter setting system, relating to the field of aircraft manufacturing technology. It includes: a control component for issuing control commands, and a high-voltage component for realizing power output. The control component includes a microcontroller for storing and executing predetermined programs and issuing program commands. Through microcontroller-based programmed control, the system achieves automated and high-precision setting of aircraft power supply characteristic test parameters. Its modular design facilitates maintenance and expansion. Combined with specific inductors and capacitors and multiple contactor connections, it provides a clean and stable power supply for testing. It fully supports various modes and different power supply systems, including power interruption, voltage spike, and distortion spectrum testing. Preset commands simplify the operation process, and the normally open contactor design enhances safety. A TCP / IP communication module supports remote monitoring and data acquisition, significantly improving testing efficiency, reliability, and management modernization.

This utility model relates to the field of electronic device technology, specifically to a power terminal group structure and a power semiconductor module, including a first power terminal and a second power terminal. Both the first and second power terminals are gate-shaped structures mounted on an insulating substrate. The vertical connection portions of the first and second power terminals are mirror-symmetrical structures. This utility model, through the mirror-symmetrical layout of the gate-shaped terminals, constructs a tightly coupled, low-inductance commutation circuit with minimized area. It utilizes the magnetic field cancellation effect of the reverse current to significantly suppress stray inductance, thereby reducing switching losses and voltage spikes, improving the module's switching frequency capability and power density, and enhancing system reliability.

This application discloses a method and related equipment for regulating the turn-off overvoltage of a three-level converter, relating to the field of power electronics technology. The method includes: establishing a target commutation circuit model corresponding to the three-level converter, the target commutation circuit model including a target stray inductor and a target switching device; based on the target commutation circuit model, constructing a target relationship between the voltage spike of the target switching device during the turn-off transient process, the maximum rate of change of the turn-off transient current of the target switching device during the turn-off transient process, and the target stray inductor; and designing the three-level converter based on the target constraints corresponding to the voltage spike, using the target relationship to regulate the turn-off overvoltage of the three-level converter. According to the embodiments of this application, reasonable regulation of the turn-off overvoltage of the switching devices in the three-level converter can be effectively achieved, thereby fully ensuring the safe operation of the devices and equipment.

This application provides a relay device, comprising: a main control unit, a switching unit, an absorption control unit, and a drive unit. The main control unit, according to the control strategy of an external circuit, sends a first signal to the drive unit at a first moment to turn the drive unit on, sends a second signal to the absorption control unit at a second moment, and sends a third signal to the drive unit at a third moment to turn the switching unit on. The main control unit is further configured to send a fourth signal to the drive unit at a fourth moment and a fifth signal to the absorption control unit at a fifth moment to turn the switching unit off. The drive unit eliminates the electric arc generated when the switching unit is turned off, and the absorption control unit absorbs the voltage spikes generated when the switching unit is turned off. This application improves the reliability and safety of the relay device.

The self-healing DC system with intelligent bus undervoltage compensation function includes two interconnected DC systems, 1# and 2#. A bidirectional DC-DC compensator DC1 is installed between the power supply DC buses. The bidirectional DC-DC compensator DC1 consists of three modules B1, B2 and B3, each containing an H-bridge. The H-bridges in module B3 are connected by an isolation transformer T1. Through the fixed turns ratio and bidirectional flow of the isolation transformer T1, combined with the current flow direction control of module B1 / module B2, bidirectional compensation between the two DC systems is achieved. Furthermore, module B3 implements zero-current switching (ZCS), and module B1 / module B2 implements zero-voltage switching (ZVS), thereby avoiding high-voltage spikes in the MOSFETs within the H-bridges. This system is suitable for high-power DC power supply systems.

The embodiment of the utility model discloses a bootstrap charge pump circuit and an energy storage power supply thereof. The bootstrap charge pump circuit comprises a charge pump module; the pre-charging module is connected with the charge pump module and is configured to pre-charge the charge pump module before the bus is conducted, so that the charge pump module outputs driving voltage; the control module is configured to be used for outputting a control signal; the bus switch module is connected with the charge pump module and the control module, and is configured to control the connection and disconnection of a bus according to the driving voltage and the control signal; and the voltage protection module is connected with the output end of the charge pump module and is configured to absorb an induced voltage peak from a bus inductor when the bus is disconnected and limit the driving voltage within a preset voltage range. According to the embodiment of the utility model, the induced voltage peak generated by the bus inductor when the bus is disconnected is absorbed through the voltage protection module, and the driving voltage is limited in the preset voltage range, so that the possibility that the charge pump stores voltage peak energy to cause continuous voltage rise to damage devices is avoided.

This invention discloses a driving circuit, relating to the field of electronic circuit technology. By setting a variable-resistance first turn-off control circuit at the driving terminal of a first switching transistor, and using a current detection circuit to detect the current in the branch containing the first switching transistor, a soft-turn-off control module, based on the turn-off signal at the driving signal input terminal and the signal from the current detection circuit, gradually changes the resistance value of the first turn-off control circuit when there is current during the first switch transistor's turn-off. This causes the voltage at the driving terminal of the first switching transistor to change slowly at the beginning of the turn-off, preventing sudden changes in discharge current from causing induced electromotive force in the parasitic inductance at the power supply terminal and resulting in voltage spikes. As the resistance value of the variable resistor circuit decreases until it reaches a first target resistance value, the first switching transistor is finally completely turned off. This achieves a driving circuit with soft-turn-off functionality, which can effectively suppress voltage spikes generated at the power supply pins when the power switching device is turned off.

The application discloses an EMI suppression driving circuit for a DC-DC chip, and relates to the technical field of electromagnetic interference suppression of a DC-DC converter. The EMI suppression driving circuit comprises a PWM regulation logic control module, the output ends of the PWM regulation logic control module are connected with the input ends of a power switch module, the logic control module has two output ends, a first output end of the logic control module outputs a driving signal Hdrv and a second output end of the logic control module outputs a driving signal Ldrv, and an EMI optimization module is additionally arranged between the gate of a PMOS tube PM1 and the gate of an NMOS tube NM1 of the power switch module. The EMI optimization module is composed of an enable module, a primary load module, a secondary load biasing module and a secondary load module, and is additionally arranged between the logic control module and the power switch module. The EMI optimization module is used for adopting a step-by-step increasing load current to slow down the gate driving voltage swing rate of the power tube, reduces the dv / dt and di / dt of the switching action from the source, effectively suppresses voltage spikes, ringing and EMI radiation.

A protection circuit that can be integrated with a GaN high-voltage device includes a main discharge path composed of a forward-triggering field-effect transistor (FET) and a reverse-triggering FET, connected in series between a signal input and a reference input. A first voltage-divider network comprising forward-oriented rectifiers and a second voltage-divider network comprises reverse-oriented rectifiers are connected between the signal input and the reference input. The gate of the forward-triggering FET is coupled to an intermediate node of the first voltage-divider network, allowing it to receive a voltage that is intermediate between the signal input and the reference input. At least one forward-oriented rectifier in the first voltage-divider network, protects the gate from voltage spikes originating at the reference input. Similarly, the gate of the reverse-triggering FET is coupled to an intermediate node of the second voltage-divider network, providing analogous protection and voltage control.

This application discloses a method and system for suppressing DC bus overvoltage in a pitch motor driver. It predicts the regenerative power the motor will generate in real time based on pitch motion commands and the motor's state, and adaptively lowers a fixed braking trigger voltage threshold according to the predicted power, forming a dynamic threshold. This approach allows the braking system to intervene before large-scale regenerative energy generation, thus pre-suppressing the bus voltage, effectively smoothing voltage spikes, avoiding the overvoltage risk caused by response lag in traditional solutions, and significantly improving the system's stability and reliability.

A gate drive circuit for a half-bridge power module with a first and second GaN HEMT is disclosed. The circuit mitigates gate voltage overshoot, oscillation, and crosstalk induced by high dv / dt at the switching node. It includes a voltage clamp circuit, electrically connected to the gate of the first GaN HEMT, to suppress gate voltage overshoot. A negative voltage generation and control circuit is configured to generate and apply a negative voltage to the gate to offset positive crosstalk voltage spikes. A low-impedance Miller current path circuit is connected to the gate to provide a discharge path for Miller current, thereby suppressing negative crosstalk voltage spikes. The circuit provides robust protection for GaN HEMTs operating at high switching speeds.

A device structure includes a parallel connection of capacitor-switch assemblies located over a substrate. The capacitor-switch assemblies include a first capacitor-switch assembly that includes a first series connection of a first capacitor and a first non-Ohmic switching device, which has a first threshold voltage and includes a first primary switch electrode, a first secondary switch electrode, and a first non-Ohmic switching material portion. The capacitor switch assemblies further include a second capacitor-switch assembly that includes a second series connection of a second capacitor and a second non-Ohmic switching device, which has a second threshold voltage and includes a second primary switch electrode, a second secondary switch electrode, and a second non-Ohmic switching material portion. The second threshold voltage is different from the first threshold voltage. The non-Ohmic switching devices may be conditionally turned on depending on a magnitude of applied voltage spikes.

This invention provides a high-density capacitor device with electrostatic discharge (ESD) protection and its fabrication method, comprising: a plurality of first deep trench structures that crisscross and isolate a substrate into multiple predetermined regions; a plurality of TVS devices and a plurality of capacitors connected in parallel and staggered within the multiple predetermined regions; each TVS device comprising: a well region and a first heavily doped region; each capacitor comprising: a plurality of second deep trench structures and a second heavily doped region, the second deep trench structures being filled with a dielectric layer and a polysilicon layer; an insulating layer having contact holes corresponding to the polysilicon layer and contact holes corresponding to the first heavily doped region; and a metal layer comprising a front metal layer and a back metal layer. Beneficial effects: This invention integrates a plurality of three-dimensional capacitors and TVS devices in parallel within the same silicon-based chip through process compatibility, enabling better absorption of switching voltage spikes and achieving the function of protecting downstream circuits.

This application discloses a power converter, its control method, and a switching power supply. The power converter includes an upper transistor, a lower transistor, and an inductor, with the common node of the upper and lower transistors being a switching node. The power converter further includes: a pull-down branch connected between the switching node and ground; a negative current detection unit that outputs a valid enable signal when a negative current on the inductor reaches a set less-than-zero current threshold during the lower transistor's conduction period; and a pull-down control unit that, upon receiving the valid enable signal, controls the pull-down branch to conduct for a short period during the dead time between the lower transistor's turn-off and the upper transistor's turn-on, thereby reducing voltage spikes at the switching node. By conducting the pull-down branch for a period during the dead time, negative current is discharged to ground, reducing voltage spikes at the switching node, preventing damage to the lower transistor, and maintaining high efficiency and transient response speed of the power converter.

This invention relates to the field of automatic control design technology, and in particular to a control system for a neutron activation analyzer. The technical solution includes a control core module, an electrical isolation module, a power supply module, a communication module, an auxiliary protection module, a host computer module, and a database module. The electrical isolation module includes digital isolation units and analog isolation units. The digital isolation units are used to achieve electrical isolation and conversion between control signals and load signals based on a physical disconnect structure. This invention avoids the impact of voltage spikes and surge currents, protects the PLC module, and improves system stability. It integrates the PLC core control architecture, host computer, and database to achieve integrated management and control of peripheral devices and full-process acquisition, storage, and traceability of operational data. It is equipped with auxiliary protection and maintenance units to ensure safe equipment operation, while simplifying operation and deployment and adapting to on-site testing needs.

This invention discloses a voltage spike absorption circuit and its control method for an energy storage inverter rectifier, comprising: a PWM control circuit, a resonant transformer circuit, and a spike absorption circuit; the PWM control circuit is used to control the stability of the voltage output from the input terminal by turning the switching transistor on and off; the resonant transformer circuit is used to regulate the voltage during the voltage transfer from the input terminal to the load; the spike absorption circuit is used to suppress voltage spikes and oscillations generated when the voltage is input to the load. This circuit design is simple, uses fewer components, simplifies the circuit while improving mass production feasibility, has strong spike absorption capability, reduces product heat generation while shrinking the heat sink size, and increases power density by more than 5%.

A protection circuit that can be integrated with a GaN high-voltage device features a main discharge path consisting of a forward-triggering field-effect transistor (FET) and a reverse-triggering FET connected in series between a signal input and a reference input. A first voltage divider network, incorporating forward-biased rectifiers, and a second voltage divider network, incorporating reverse-biased rectifiers, are connected between the signal input and the reference input. The gate of the forward-triggering FET is connected to an intermediate node of the first voltage divider network, allowing it to receive a voltage between the signal input voltage and the reference input voltage. At least one forward-biased rectifier in the first voltage divider network protects the gate against voltage spikes generated at the reference input.Similarly, the gate of the backward triggering FET is connected to an intermediate node of the second voltage divider network, thus enabling analog protection and analog voltage control.

A voltage controller detects a voltage spike in an electrical signal received from an electrical power source. The voltage controller is implemented using a single-loop control system in a stationary reference frame. The electrical signal includes voltage harmonics caused by a non-linear or unbalanced load. The voltage controller includes a phase-compensated harmonic regulator that regulates the voltage harmonics present in the electrical signal and receives a feedback voltage of the single-loop control system. The feedback voltage is a delayed version of an instantaneous voltage of the electrical signal. The instantaneous voltage is sub-transiently stabilized into a steady-state voltage based on the feedback voltage. Sub-transiently stabilizing the instantaneous voltage is performed within a single cycle after the voltage spike is detected. The steady-state voltage has a total harmonic distortion less than a threshold total harmonic distortion and the steady-state voltage has a balanced sinusoidal waveform.

The disclosure relates to a low frequency switching device (1) and method for minimizing switching noise caused by back-EMF in inductive loads. The device comprises a load (3), a switching device (4) driven by a digital logic signal, and a programmable voltage or current source (2) supplying the switching device. The programmable source is configured to output a voltage / current with a curved rising and / or falling edge preceding or trailing polarity switching, the rise and / or fall time being greater than zero. By controlling the edge profile and decaying response frequency equal to the switching frequency, stored inductive energy in the load, cabling, or switching device is substantially depleted before polarity reversal, thereby suppressing voltage spikes, ringing, and electromagnetic noise. The switching device may comprise transistors or relays in an H-bridge configuration, and the programmable source may output rectified signals with sine-wave components. The invention is particularly advantageous for subsea electromagnetic survey systems, where electrodes in seawater form the load, enabling reliable low frequency operation in the range 0.01–100 Hz with reduced interference and improved signal quality.

The application discloses a non-isolated clamping circuit, a feedback high-voltage spike energy method and a switching power supply for an input-output common ground power converter. The power converter comprises a primary side switching circuit, a transformer, a secondary side rectifier circuit and an input capacitor. The clamping circuit comprises at least one feedback diode. The anode of the feedback diode is connected to a stress spike node of a rectifier tube in the secondary side rectifier circuit, and the cathode of the feedback diode is connected to a stable voltage node on the input side. The potential of the stable voltage node is higher than the theoretical platform voltage of the cathode node of the rectifier tube in the normal working state. The application discards the traditional idea of connecting the rectifier tube in parallel to absorb spike energy, and instead constructs a new energy feedback path to guide the high-voltage spike energy generated when the rectifier tube is turned off to a stable voltage node, thereby realizing efficient, low-stress and high-reliability clamping.

This utility model discloses a highly integrated serial port surge protector, comprising a first plug, a second plug, a connecting wire, and a PCB board. The first plug includes multiple plug terminals and a first insulating body covering the multiple plug terminals. The second plug includes multiple socket terminals and a second insulating body covering the multiple socket terminals. The connecting wire connects the first plug and the second plug. The PCB board is located in either the first plug or the second plug. The PCB board has a first-level protection module for discharging high-energy surge currents caused by lightning strikes and a second-level protection module for absorbing residual energy and suppressing rapid voltage spikes. The first-level protection module and the second-level protection module are connected by a circuit to form multi-level collaborative protection. Through integrated design and TSS / TVS multi-level collaborative protection, the protector achieves miniaturized, low-cost, and highly reliable surge protection, suitable for industrial control and communication equipment.