234 results about "Surge voltage" patented technology

Disclosed in the present application are a silicon carbide MOSFET device and a manufacturing method therefor. The silicon carbide MOSFET is provided with a first withstand voltage masking structure and a second withstand voltage masking structure. The withstand voltage performance of the device is improved, the breakdown problem of a gate insulating dielectric layer can be avoided, the electrostatic effect of the device on a severe environment and the high-voltage peak tolerance capability in the circuit are improved, and the surge voltage resistance of the device and the over-voltage protection capability are improved. Ion implantation can be carried out on a first trench to form the first withstand voltage masking structure, and ion implantation can be carried out on a second trench to form the second withstand voltage masking structure.

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.

The utility model relates to an H-bridge driving circuit with a discharge branch and a chip, and belongs to the field of motor driving. The driving circuit comprises a driving chip module, a switch control module and a switch misconduction protection module. The switch control module is composed of a triode and MOS tube combined control circuit, it is ensured that grid charges can be rapidly discharged when the IGBT is turned off, and misconduction is prevented. The misconduction protection module enhances the charge discharge capability by providing a low-impedance path, ensures the accurate turn-off of the IGBT, and avoids the influence of surge voltage. The circuit realizes reliability and quick response performance in forward and reverse control and high-frequency switch application of the motor, and is suitable for direct-current motor control, stepping motor control, direct-current-alternating-current converters, direct-current-direct-current converters and other power electronic devices. Through the design, the stability and the safety of the motor control system are effectively improved.

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 invention relates to a surge protection device and a vehicle, and the device comprises a detection module of which the input end is used for accessing a power supply voltage signal and is connected with a load power supply end through a power harness, and which is configured to output a first detection signal when detecting that a surge voltage signal exists in the power harness based on a comparison result of a reference voltage signal and the power supply voltage signal; the first end of the switch module is connected with the output end of the detection module, and the switch module is switched off according to the first detection signal; the first input end of the protection module is connected with the input end of the detection module, the second input end of the protection module is connected with the second end of the switch module, the output end of the protection module is connected with the load power supply end, and the protection module is configured to respond to turn-off of the switch module and control connection between the first input end and the output end of the protection module based on a surge voltage signal. A voltage signal which is output to a load power supply end through an output end of the clamp is clamped in a safe voltage range; therefore, safe and reliable surge protection can be carried out on the power supply loop.

The utility model relates to the technical field of electrical protection devices, in particular to a surge protection device with a temporary overvoltage protection function, which comprises a piezoresistor assembly, an inductor and a switch assembly, the piezoresistor assembly is connected with the switch assembly in parallel, and two ends of the inductor are respectively connected with the piezoresistor assembly and the switch assembly. The switch assembly comprises a conduction switch, a combination switch, a resistor R1 and a capacitor, the conduction switch is in linkage connection with the combination switch, the conduction switch is connected with the capacitor in series, the resistor R1 is connected with the combination switch and the inductor in series, and one end, away from the conduction switch, of the capacitor is connected with the combination switch and the piezoresistor assembly; when the conduction switch is closed and the capacitor is fully charged, the combination switch is conducted. By means of the arrangement, the surge protection device can be prevented from being damaged by impact when overvoltage occurs; when surge voltage occurs, the surge protection device can effectively discharge the surge voltage, and the safety of electric equipment is protected.

The utility model discloses a circuit capable of inhibiting surge voltage between contacts when a relay acts. The circuit comprises a relay, a resistor, a piezoresistor, a diode, a direct current electromagnetic coil and a binding post. When a high-capacity inductive load in a circuit loses power, a relatively high reverse electromotive force, namely a surge voltage, is generated. A resistor-diode series follow current loop and a piezoresistor-diode series surge suppression loop are reversely connected in parallel to the two ends of an inductive load, when the load loses power and generates reverse electromotive force, the follow current loop eliminates or reduces the electromotive force, and the surge suppression loop is conducted and shunted when the electromotive force exceeds a threshold value, so that surge voltage is prevented from being generated through dual protection; and a relay contact and a circuit are protected. The scheme is a passive suppression protection circuit, has the advantages of simple structure, low cost, fast response, recoverability, dual protection and the like, and improves the operation stability and reliability of equipment.

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 present invention belongs to the technical field of emergency protection devices, in particular to an emergency protection device for a circuit and a method thereof. The device includes a wiring base, a normally closed single-pole double-throw relay detachably arranged on the front end face of the wiring base, and a surge protection module arranged at the lower part of the front end face of the wiring base; an installation groove is arranged on the front end face of the wiring base, and the surge protection module is detachably arranged in the installation groove; the device further includes a separation module arranged in the installation groove, which is used to trigger when the surge protection module breaks down and shorts, and realize the separation operation of the surge protection module from the installation groove; during the actual working process, the surge protection module can release the overloaded or surge voltage to protect the load. If a continuous fault overvoltage causes the surge protection module to break down and short, and then causes the temperature to continuously rise and lead to a fire, the separation module can perform a separation operation to separate the surge protection module from the installation groove to achieve forced disconnection.

To provide a power converter capable of improving power efficiency while correcting a surge voltage and loss imbalance among switching elements.SOLUTION: A power converter includes: a first capacitor and a second capacitor; a first switching element to a sixth switching element; and a load. Switching between a third output state and a first output state is executed via a second dead time state, and switching between the third output state and the second output state is executed via a first dead-time state. When transitioning between the third output state and the second dead time state, a fifth switching element completes either to turn on the third switching element before the third switching element or turns off the same after the third switching element, or when transitioning between the third output state and the first dead time state, the sixth switching element, performs at least one of the following operations: completing the turn-on before the second switching element or completing the turn-off after the second switching element.SELECTED DRAWING: Figure 8

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 provide a switching power supply device reducing voltage of surge power applied to a switching element and reducing loss.SOLUTION: An insulated switching power supply device 3 has a choke coil L1, switching elements Q5, Q8, Q9, and Q12, current resonance half-bridge circuits 20 and 22, a power factor improving / inverter control circuit 46, and a frequency control circuit 44. The frequency control circuit 44 generates a reference frequency signal fsw with the same frequency as the resonance frequency of the current resonance half-bridge circuits 20 and 22. The power factor improving / inverter control circuit 46 controls switching elements included in the current resonance half-bridge circuits 20 and 22, supplies power of a power supply Vi to a load Lo, and conversely regenerates power from a battery BAT to the power supply Vi.SELECTED DRAWING: Figure 4A

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

According to the battery management chip protection circuit, a battery management chip comprises a first number of sampling pins, the protection circuit comprises a plurality of transient voltage suppressor diodes TVSs, the negative electrode of each TVS is connected with a battery cell corresponding to the last sampling pin in each group of sampling pins, and the negative electrode of each TVS is connected with a battery cell corresponding to the last sampling pin in each group of sampling pins; the positive electrode is connected with the battery cell corresponding to the first sampling pin in the battery management chip; wherein the number of TVSs contained in each group of sampling pins is the same, and in each group of sampling pins, the withstand voltage values of all the sampling pins are the same. In this way, stepped protection of the first number of sampling pins in the battery management chip is achieved, surge voltage exceeding the withstand voltage value of the middle pin is prevented from being generated in the surge limiting process of the last pin, the reliability of the battery management chip is improved, and the service life of the battery management chip is prolonged.

The invention discloses a surge protection circuit of a converter and a power converter, and belongs to the technical field of converters. The surge protection circuit comprises a sampling circuit which is connected with an AC bus and is configured to obtain a sampling voltage of the AC bus; the detection circuit is connected with the sampling circuit and is configured to generate a first signal based on the sampling voltage; the logic circuit is connected with the detection circuit and is configured to access a second signal and generate a third signal when the polarity states represented by the first signal and the second signal are inconsistent; and the protection circuit is connected with the logic circuit and the cyclic wave conversion circuit and is configured to perform wave sealing control on at least one pair of reverse switching tubes in the cyclic wave conversion circuit when receiving the third signal. Surge voltage impact can be detected in the first time, wave sealing is carried out, positive and negative buses on the power grid side are isolated, the short circuit risk is reduced, and a switch tube is not prone to overstress damage.

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 utility model discloses an electric actuator detection system. A first test station and a second test station are formed on a test table board; the first test station is provided with a first measurement and control module, and the second test station is provided with a second measurement and control module. Each of the first measurement and control module and the second measurement and control module comprises a test board card, and the test board card is integrated with an Ethernet interface, a control signal input and output interface, a panel indicating lamp / button interface and an electric energy meter interface; the Ethernet interface is used for networking of the first measurement and control module / the second measurement and control module. The control signal input and output interface is used for input and output of control signals of the first measurement and control module / the second measurement and control module. The panel indicating lamp / button interface is used for working signal indication or working control of the first measurement and control module / the second measurement and control module. The electric energy meter interface is used for the first measurement and control module / the second measurement and control module to detect the working current of the detected product and simulate the impact voltage and the impact current during opening and closing. The device is high in detection efficiency, low in cost and high in detection result accuracy.

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.