170 results about "Surge voltage" patented technology

The invention discloses a surge protection circuit, which belongs to the field of semiconductor surge protection devices, and comprises a plurality of resistors, a plurality of voltage stabilizing diodes and a plurality of transistors, the first end of the first resistor is connected with a bus voltage, the first end of the first transistor and the second end of the second transistor; the second end of the first resistor is connected with the third end of the first transistor and the cathode of the first Zener diode, and the anode of the first Zener diode is connected with the cathode of the second Zener diode and the third end of the third transistor. The anode of the second voltage stabilizing diode is connected with the second end of the third resistor, the second end of the third transistor, the first end of the second transistor and the ground, the second end of the first transistor is connected with the first end of the second resistor, and the second end of the second resistor is connected with the first end of the third resistor, the first end of the third transistor and the third end of the second transistor. According to the invention, the problems of surge voltage such as electrostatic discharge, electrical fast transient pulse train, lightning stroke, peak and the like, transient voltage generated in a hot plug process and the like can be solved.

This application discloses a silicon carbide MOSFET device and its fabrication method. The silicon carbide MOSFET has a first withstand voltage masking structure and a second withstand voltage masking structure, which improves the withstand voltage performance of the device, avoids the problem of gate insulating dielectric layer breakdown, improves the device's resistance to electrostatic effects in harsh environments and high voltage spikes in the circuit, and improves the device's surge voltage resistance and overvoltage protection capability. Furthermore, the first withstand voltage masking structure can be formed by ion implantation based on the first trench, and the second withstand voltage masking structure can be formed by ion implantation through the second trench. A large depth of ion implantation region in the silicon carbide epitaxial layer can be achieved without high-dose, high-energy ion implantation. The fabrication process is simple and the fabrication cost is low.

Embodiments of the present application relate to the technical field of circuits, and provide a boost circuit and an electronic device, which can solve the problem of a device being easily damaged in a surge voltage scenario. The boost circuit comprises: a first inductor and a second inductor; at least two first switch transistors, which are sequentially connected in series between a second end of the second inductor and a positive electrode of a busbar; at least two second switch transistors, which are sequentially connected in series between the second end of the second inductor and a negative electrode of the busbar; and a first capacitor which is electrically connected between a first node and a corresponding second node. At least one of the at least two first switch transistors and the at least two second switch transistors is connected in parallel with a corresponding variable resistor device, the variable resistor device being a device which changes from a high resistance state to a conducting state when the voltage difference between two ends exceeds a voltage threshold. The at least two first switch transistors and the at least two second switch transistors are used for cutting off when a current on the first inductor exceeds a current threshold.

The invention discloses an OLTC topological structure of an electronic soft switching technology and a driving method. In the topological structure, a power supply is connected with a first transformer, the first transformer is connected with a second transformer, and the second transformer is connected with a load; a low-voltage winding of the first transformer is connected with a plurality of taps; the fixed end of the low-voltage winding of the first transformer and each tap are connected with one end of an independent mechanical switch; according to an interval connection mode, the other ends of all the mechanical switches are connected to form two series switch loops, and each series switch loop is connected with an independent electronic change-over switch to form two series circuits; the two electronic change-over switches are connected in parallel, and the second transformer is connected into a series circuit controlled by the two electronic change-over switches respectively. The mechanical switch and the electronic change-over switch are jointly used, so that short-circuit current and surge voltage cannot be generated when the electronic change-over switch performs state switching, and the quality of output voltage waveforms is improved.

The invention relates to the technical field of power electronics, and discloses a surge voltage suppression system and a control method thereof. The system comprises a surge feature extraction unit, a suppression map generation unit, a strategy deduction and check unit and an instruction synthesis and distribution unit which are connected in sequence. According to the method, surge feature descriptors are extracted and fused with a historical case library and a real-time power grid topology, and a suppression atlas containing multi-path parameter combination is dynamically generated; and performing time sequence deduction and interaction influence calculation on each path in the map, iteratively correcting parameters to output a checked strategy sequence, and finally converting the strategy sequence into an instruction to control the action of the physical suppression equipment. According to the method, the whole process of the suppression strategy from historical experience learning, dynamic generation to global collaborative rehearsal optimization is realized, and the adaptability, the collaboration and the reliability of responding to surges in a complex power grid environment are improved.

The utility model discloses a surge protection circuit, a controller, a battery management system, power distribution equipment and a vehicle. The surge protection circuit comprises a first transient voltage suppressor diode and a second transient voltage suppressor diode, the anode of the first transient voltage suppressor diode is connected with the anode of the second transient voltage suppressor diode, and the cathode of the first transient voltage suppressor diode is suitable for being connected with the anode end of a power supply. The cathode of the second transient voltage suppression diode is suitable for being connected with the negative terminal of the power supply and the first grounding terminal. According to the surge protection circuit, when a positive surge occurs and the first transient voltage suppressor diode is broken down, the second transient voltage suppressor diode can serve as a common diode to be conducted, surge voltage is discharged from the first grounding end, and when a negative surge occurs and the second transient voltage suppressor diode is broken down, the surge voltage is discharged from the second grounding end. And the first transient voltage suppression diode can be conducted as a common diode, so that the surge resistance of a subsequent circuit can be improved.

The application provides a voltage stabilizing circuit, a motor control circuit, a motor and an electrical appliance. The voltage stabilizing circuit is used for stabilizing a working circuit, and comprises: an energy processing unit connected in parallel with the working circuit and capable of stabilizing the working circuit; a switching unit connected between the working circuit and the energy processing unit and used for controlling the on-off of the energy processing unit and the working circuit; and a control unit connected with the switching unit and used for controlling the state of the switching unit according to the output power of the working circuit, so that the energy processing unit is connected to or disconnected from the working circuit. The voltage stabilizing circuit has the functions of power factor correction and surge voltage absorption, and can also maintain the minimum value of the bus voltage.

The utility model discloses a voltage surge generation circuit, include: auxiliary source subcircuit, monostable subcircuit and external power supply switching subcircuit, auxiliary source subcircuit is used for the power supply of monostable subcircuit, monostable subcircuit is used for through the timer output high level time of configuration self, to output control signal, external power supply switching subcircuit is used for under the control of control signal output corresponding surge voltage. The utility model discloses utilize auxiliary source subcircuit, monostable subcircuit and external power supply switching subcircuit composition voltage surge generation circuit, has realized the generation of surge voltage, compared with the existing surge generator has simple structure, response speed is fast and the characteristics of high reliability. Further, can edit the timer peripheral circuit in monostable subcircuit according to actual needs, to control the pulse width of surge voltage, adjusts the surge voltage of external power supply voltage output different voltage grade.

The invention provides a rapid flexible switching method for a permanent magnet synchronous motor winding reconstruction circuit, and belongs to the technical field of permanent magnet synchronous motor winding reconstruction. In order to solve the problems of surge voltage, impact current, torque drop and even torque interruption generated in a motor winding reconstruction transient state and relatively long transient state reconstruction time in an existing permanent magnet synchronous motor winding reconstruction method, the method comprises the following steps: step 1, in a zero vector interval of space vector pulse width modulation, carrying out space vector pulse width modulation; the permanent magnet synchronous motor winding reconstruction circuit enters a reconstruction transient state; 2, forming three different natural follow current loops of a mode 1, a mode 2 and a mode 3 by utilizing the combination of the switching states of the motor winding, the inverter, the series reconfiguration switch and the parallel reconfiguration switch, and adjusting the length of a zero vector interval required by winding reconfiguration according to the operation condition; and step 3, completing all reconstruction transient states in a zero vector interval of space vector pulse width modulation, and realizing switching of motor winding connection modes.

The utility model relates to an anti-surge circuit and an energy storage system. The anti-surge circuit comprises an energy storage starting unit, a main circuit switch unit, a surge switch unit, a primary anti-surge unit and a secondary anti-surge unit. Wherein the energy storage starting unit is used for controlling the conduction of the main circuit switch unit when an input power supply is connected, so as to connect a path between the input power supply and a load through the main circuit switch unit. In the process of connecting the path through the main circuit switch unit, if the input voltage of the input power supply is between a first voltage value and a second voltage value, the first-stage anti-surge unit is controlled to be switched on through the first surge voltage at the first connecting part, so that the first surge voltage is absorbed through the first-stage anti-surge unit; the surge switch unit is controlled to be switched on through the first surge voltage, so that the main circuit switch unit is switched off; and if the input voltage is greater than the second voltage value, a second surge voltage at the first connection part is absorbed through the second-stage anti-surge unit. By adopting the anti-surge circuit, the safety can be improved.

Disclosed in the present application are a varistor mounting structure and an electrical connection device, the electrical connection device comprising a power supply line (100) and a detection and protection apparatus provided on a circuit board and electrically connected to the power supply line (100). The detection and protection apparatus comprises a trip coil (Lx) for generating an electromagnetic force to disconnect an electrical connection, and a first varistor (ZR1) for absorbing a surge voltage. A support frame (400) for fixing the trip coil (Lx) is provided on the circuit board, and a first mounting portion (410) for mounting the first varistor (ZR1) is provided on the support frame (400). The first mounting portion (410) is provided with a first mounting hole (411) and a second mounting hole (412) for two pins of the first varistor (ZR1) to pass through respectively, and an isolation portion (413) for increasing a creepage distance is provided between the first mounting hole (411) and the second mounting hole (412).

The invention belongs to the technical field of aircraft control, and particularly discloses an airborne power supply control system and method, and the method comprises the steps: a protection circuit achieves the power supply overcurrent protection, surge current suppression protection and surge voltage protection of an input aircraft power supply, and transmits the power supply overcurrent protection, surge current suppression protection and surge voltage protection to a filter circuit; the filter circuit carries out electromagnetic interference filtering on the input airplane power supply and sends the electromagnetic interference to the power supply interruption detection circuit, the power supply control circuit and the energy storage circuit respectively; when the power supply of the aircraft is cut off instantaneously, the energy storage circuit continues to supply power to the flight control equipment to enable the flight control equipment to work normally. The power supply interruption detection circuit detects the working state of an aircraft power supply in real time, and sends power supply interruption information to the flight control equipment when detecting that the aircraft power supply has power supply transient interruption; and after receiving the power supply interruption information, the flight control equipment controls the power supply control circuit to cut off the power supply of the aircraft power supply to other equipment, and controls the aircraft power supply to supply power to other equipment again after a preset time is delayed.

The utility model provides an integrated electronic protection device and a photoelectric sensor employing the same, the integrated electronic protection device comprises a housing, a Schottky diode and an array TVS tube are arranged in the housing, the array TVS tube comprises an N-type semiconductor substrate located in the housing and four first P-type base regions arranged on the surface of the N-type semiconductor substrate, and the four first P-type base regions are arranged on the surface of the N-type semiconductor substrate. First anode electrodes are arranged on the surfaces of the four first P-type base regions, and first metal layers capable of leading out pins are arranged on the surfaces of the first anode electrodes; compared with the prior art, the integrated electronic protection device has the following beneficial effects that the integrated electronic protection device is high in integration level and very small in size, so that the integrated electronic protection device can be applied to a miniature photoelectric sensor, the space is greatly saved, and surge voltage protection and power supply polarity protection are taken into consideration; in addition, the integrated electronic protection device in the utility model carries out surge voltage protection between lines, the residual voltage is relatively low, and the requirement on the withstand voltage of a post-stage circuit is not very high.

To reduce a switching surge voltage.SOLUTION: The power converter includes a first switching element, a second switching element, a third switching element, a fourth switching element, a fifth switching element, and a sixth switching element. In the second output state, the third switching element and the fourth switching element are on, and the first switching element, the second switching element, and the sixth switching element are off. In the third output state, the second switching element, the third switching element, the fifth switching element, and the sixth switching element are on, and the first switching element and the fourth switching element are off. In the sixth output state, the third switching element is on, and the first switching element, the second switching element, the fourth switching element, the fifth switching element, and the sixth switching element are off. The output state transitions from the third output state to the sixth output state, and from the sixth output state to the second output state.SELECTED DRAWING: Figure 16

The utility model discloses a surge suppression circuit and an electronic product using the same. The circuit comprises a rectification filtering unit, a surge suppression unit, a PFC boost unit, a voltage detection unit and a relay control unit. The input end of the rectifying and filtering unit is connected with a power live wire and a power zero wire, and the rectifying and filtering unit is used for converting an alternating-current power supply signal into a direct-current power supply signal; the PFC boost unit is used for adjusting the current waveform of the power supply signal; the voltage detection unit outputs a first voltage detection signal when receiving a power supply signal exceeding a preset voltage threshold, and outputs a second voltage detection signal when receiving a power supply signal not exceeding the preset voltage threshold; the relay control unit outputs a first switching signal to the surge suppression unit, and the surge suppression unit outputs a surge control signal when receiving the first switching signal to control the surge voltage to be reduced. The utility model provides a technology capable of effectively suppressing surge current and reducing power supply loss.

A discharge control switch is protected against surge voltage. A battery pack is provided in which a discharge control switch is connected to a positive electrode side power line between a positive electrode terminal and a positive electrode output terminal of a battery or a negative electrode side power line between the negative electrode terminal and a negative electrode output terminal of the battery, a reflux portion is connected between the positive electrode side power line and the negative electrode side power line on a side closer to the positive electrode output terminal and the negative electrode output terminal than the discharge control switch, a reflux control signal is output from a control unit to an insulating portion, and a switch unit is switched from off to on based on the reflux control signal.

The application relates to an energy storage device and a power supply method thereof. The energy storage device comprises a battery module, a power conversion circuit, a sensing circuit and a control circuit. The battery module provides a direct current voltage. The power conversion circuit converts the direct current voltage into an alternating output voltage. The sensing circuit senses the current and voltage of the output terminal of the power conversion circuit. The control circuit controls the power conversion circuit to reduce the alternating output voltage to a preset voltage in a preset period, and controls the power conversion circuit to output a surge voltage from the preset voltage, so that the power conversion circuit enters a surge generation period. The control circuit determines whether to close the energy storage device according to whether the output terminal of the power conversion circuit generates a surge current in the surge generation period. The energy storage device can accurately determine whether a load has been removed from the energy storage device, and automatically closes the energy storage device when the load is removed from the energy storage device, thereby effectively reducing power loss.

The purpose of the present invention is to reduce recovery loss and suppress surge voltage in an RC-IGBT. A semiconductor device has: an n-type field stop region distributed across an IGBT region and a diode region; a p-type collector region disposed in the IGBT region on the lower side of the field stop region; a plurality of n-type cathode regions disposed in the diode region on the lower side of the field stop region; and a plurality of p-type surge suppression regions disposed below the field stop region in the diode region. Each of the cathode regions has: a first cathode region in contact with the lower electrode and having an n-type impurity concentration of 1 * 1019 cm-3 or more; and a second cathode region disposed between the first cathode region and the field stop region and having an activation rate of n-type impurities of 85% or less.

A surge protection device is mounted on a transmitter. A cable that sends a signal received from an external device is connected to terminal block screw portions. The connector is detachable with respect to a connector component provided in the transmitter, and outputs an input signal received from each of the terminal block screw portions to the connector component. The surge protection element absorbs a surge electric current in a case where a surge voltage is applied from the terminal block screw portions to the connector component. The terminal connector portion is connected to the terminal block screw portions via the surge protection element.

The utility model relates to a differential mode surge protection circuit, a filter and a photovoltaic energy controller. The circuit comprises two fuses, a first differential mode protection module, a second differential mode protection module and an access terminal, the two fuses are respectively connected with a first differential input end and the access terminal of an RS485 module through a first lead, and a second lead is connected with a second differential input end and the access terminal of the RS485 module; the access terminal is used for accessing an external differential mode surge voltage; the first differential mode protection module is connected between the two fuses and the access terminal and is used for performing surge voltage relief on external differential mode surge voltage and outputting first differential mode voltage to pass through the two fuses; and the second differential mode protection module is connected between the RS485 module and the two fuses, and is used for performing surge pressure relief on the first differential mode voltage and outputting a second differential mode voltage to the RS485 module. By adopting the circuit, the discharge behavior caused by external differential mode surge voltage when the distance between the two fuses is very close can be avoided.

The application provides a surge voltage suppression circuit and method, and relates to the technical field of power electronics. The circuit comprises: a surge detection circuit, an input end of which is connected to a bus to be protected, and used for acquiring a bus voltage of the bus to be protected; a discharge circuit, used for discharging a surge energy of the bus to be protected when the bus to be protected is accessed; a power switch circuit, used for connecting the discharge circuit and the bus to be protected, so as to control the discharge circuit to access or be separated from the bus to be protected; and a control circuit, an input end of which is connected to an output end of the surge detection circuit, and an output end of which is connected to a driving end of the power switch circuit; the control circuit is used for controlling the power switch circuit to be turned on or turned off according to the bus voltage, a preset upper threshold value and a preset lower threshold value. The application can realize fast and stable suppression of high-energy surge voltage in the scene of bus high-power surge suppression, reduce the loss and heat quantity of the power switch circuit, and improve the power density and reliability of the surge voltage suppression circuit.

There has been a problem that when a value of a current flowing through a thermistor increases, a voltage drop generated in the thermistor increases, and variations occur in a clamp voltage. A semiconductor device includes: a switching element that is on-off controlled; and a surge voltage protection circuit connected between a positive electrode side terminal of the switching element and a control terminal of the switching element. The surge voltage protection circuit includes a first Zener diode, a second Zener diode connected in series with the first Zener diode, and a temperature characteristic compensating element having a temperature coefficient different in polarity from the first Zener diode and the second Zener diode and connected in parallel with the second Zener diode.

The present application relates to a kind of airborne 28V direct current overvoltage surge suppression circuit and overvoltage surge suppression method.The circuit is composed of overvoltage detection circuit, drive circuit, switch circuit and voltage divider resistor, the input surge voltage is clamped within a certain range by the way of resistance voltage division in the present application, ensure that the load in the back stage works within the safe voltage.Overvoltage detection circuit detects whether there is overvoltage surge, when overvoltage surge occurs, control drive circuit operation, drive circuit drives switch circuit 2 to turn on, switch circuit 1 is closed, at this time, voltage divider resistor 1 and voltage divider resistor 2 are put into work, form resistance voltage division, clamp the output voltage within the safe voltage range.Compared with the mainstream technical scheme of existing MOS tube dissipation method, chopper method, etc., the 28V direct current overvoltage surge suppression circuit provided by the present application has the advantages of large power, high efficiency, simple circuit and device nationalization, etc.The present application is suitable for the scene that 28V direct current input and load output are not common.

1. The name of the design product: export type surge protector. 2. The use of the design product: for preventing the induction thunder, overvoltage and surge voltage from causing harm to various electronic devices, and providing safety protection for various electronic devices. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The invention discloses a control device and method for a vehicle intelligent distribution box, and the system comprises a voltage stabilization module which is used for adjusting the output voltage of the distribution box in real time; the overvoltage absorption module is used for carrying out voltage clamping protection and energy discharge; the intelligent power module is used for carrying out dynamic power distribution management according to the actual operation condition of the load and carrying out automatic fault judgment and state monitoring; and the power distribution control module is used for carrying out data interaction with a vehicle information system, carrying out data interaction with a CAN network in the intelligent power module and controlling the intelligent power module. According to the device, automatic fault judgment and state monitoring can be realized through the intelligent power module, so that faults such as short circuit and overcurrent can be identified in time, a power supply can be quickly cut off when faults occur, and equipment damage or fire hazard triggering can be prevented; and peak and surge voltage formed by various reasons of the vehicle power grid is absorbed through the overvoltage absorption module, so that the safety and the stability of the vehicle power grid are maintained.

To provide an igniter which can appropriately protect a switching element from surge voltage, and an internal combustion engine ignition system.SOLUTION: An igniter A1 includes: a switching element 1 having a first electrode 11, a second electrode 12, and a third electrode 13 for controlling electric conduction states of the first electrode 11 and the second electrode 12; and a control circuit 2, and further includes a first diode 3 electrically connected between the first electrode 11 and the second electrode 12.SELECTED DRAWING: Figure 1

To provide a power conversion device capable of suppressing a surge voltage while improving responsiveness to a change in a load.SOLUTION: According to an embodiment of the present disclosure, there is provided a power conversion device including: a transformer including a first power terminal, a switching circuit connected to the first power terminal and including one or more switching elements, a first winding guided to the switching circuit, and a second winding; a capacitor provided in a path connecting the switching circuit and the first winding of the transformer; a current sensor capable of detecting a current flowing through one of the first winding and the second winding; a rectifier circuit connected to the second winding; a smoothing circuit connected to the rectifier circuit; a second power terminal guided to the smoothing circuit; and a control circuit capable of operating one or more switching elements at a predetermined switching period and capable of controlling a switching operation of the one or more switching elements based on a peak current of a current detected by the current sensor.SELECTED DRAWING: Figure 1

This invention discloses a surge protection circuit for gallium nitride (GaN) power devices in a power factor correction (PFC) circuit, aiming to solve the problems of insufficient surge resistance of GaN power devices and the high residual voltage of existing surge protection schemes, which easily leads to overvoltage breakdown of GaN power devices. A surge suppression unit is set between the rectifier circuit and the PFC main circuit. The surge suppression unit adopts a common-mode inductor containing a first coil L2A and a second coil L2B, coupled with a varistor VR4 in series, and is paired with capacitors C1 and C2 to form a π-type filter. Under normal operating conditions, it performs voltage filtering. During a lightning surge, VR4 breaks down, generating a surge current in L2A. The second coil L2B couples to generate a reverse electromotive force to offset the surge voltage, reducing the residual voltage at the input of the PFC main circuit. A primary protection unit assists in surge suppression. The PFC main circuit adopts a Boost topology and GaN power devices. This circuit has a simple structure, low cost, and high reliability, and is suitable for surge protection of outdoor GaN power supplies such as LED streetlights.

The invention provides a surge protection circuit and an electronic device, the surge protection circuit comprises an impedance unit and a first surge protection unit, and the impedance unit is used for reducing the amplitude of a surge current of a surge signal; the first surge protection unit comprises a first blocking unit, a first clamping unit and a first discharge unit; the first clamping unit is used for clamping the surge voltage of the surge signal to a target range of the target chip; the first discharge unit is used for discharging a surge signal; the first blocking unit is used for blocking the surge signal from flowing to the target chip. According to the surge protection circuit, when the target chip suffers from the surge signal, the impedance unit can be utilized to reduce the amplitude of the surge current of the surge signal, and the clamping unit is utilized to clamp the surge voltage of the surge signal to the target range of the target chip, so that the probability of damage to the target chip is reduced, and the reliability of the surge protection circuit is improved. The surge protection circuit is high in protection level and can adapt to a lightning sensitive area or a large power equipment area.

The invention relates to the technical field of battery management systems, in particular to a monomer acquisition optimization method, which comprises the following steps of: acquiring a copper bar as a virtual battery cell, acquiring a voltage signal of the copper bar through an unused channel, establishing a surge voltage calculation model at the moment when a relay is closed, and evaluating whether a TVS (Transient Voltage Suppressor) tube is added to protect a front-end AFE acquisition chip or not. The problem of voltage acquisition errors caused by inaccurate cross-acquisition copper bar compensation can be effectively solved, meanwhile, the risk of damage of surge voltage to an acquisition chip is avoided, the acquisition precision and the system stability are remarkably improved, and support is provided for standardization and platformization of a BMS scheme in the new energy field.