480 results about "High voltage igbt" patented technology

The present invention relates to Voltage balancing control method for modular multilevel converter is characterized that, it includes some steps as follows:

1) Determine the leg current direction is positive or negative;

2) Find out the highest sub module on output state whose capacitor voltage amplitude is the maximum, and find out that on bypass state whose capacitor voltage amplitude is the minimum;

3) Determine whether the sub module inputs or bypass operation; this method avoided switching arbitrariness of the sub module, and decreased the switching frequency of the sub module. The capacitor voltage balancing control of the sub module proposed by the method is more suitable to be applied in the field of high voltage and large capacity converter that has large numbers of sub modules.

A high voltage level shifter utilizing only low voltage PMOS and low voltage NMOS devices. The high voltage level shifter is used to distribute the high voltage almost equally among the PMOS devices and almost equally among the NMOS devices to meet the device electrical specification of low voltage MOS devices for various breakdown mechanisms. A layout technique is also used to achieve a much higher junction breakdown of N+ drain to P-substrate and a better gated diode breakdown of NMOS devices.

The invention relates to a voltage conversion device in the electronic power system in order to simplify the loop structure, save switch devices and solve the issues of bidirectional flow of the power as well as the equal flows in the low voltage stages. The device includes 1-4 phases. Each phase is independent with the identifical structure composed of the high voltage stage, the isolation stage and the low voltage stage. The high voltage stage includes 2-30 identical power conversion modules in serial. The isolation stage includes the part of the modulation/demodulation in high frequncies etc. The low voltage stage includes the power conversion module. Comparing with the foreign scheme, the number of the devices is reduced one-third, and the cost also is reduced.

A device for detecting the insulation resistance of a high-voltage battery system of a motor vehicle that includes a high-voltage battery and a high-voltage component which is operatively connected to terminals of the high-voltage battery via converters. The device includes a reference resistor operatively connected to the terminals of the high-voltage battery via switches, with a voltage measurement device configured to detect the voltage present between each respective terminal and a reference potential of the vehicle; a voltage measurement device configured to measure the voltage between the terminals; and a coupling circuit configured to monitor the high-voltage component when the converters are open.

The invention discloses a unipolar current-voltage integration sensor, relating to an electronic sensor in the field of intelligent power grids. The sensor comprises a current sensor, a voltage measurement sensor, a voltage correction sensor, a signal modulation circuit, an A/D (Analog to Digital) conversion circuit, an FPGA (Field Programmable Gate Array) unit, a wireless transmission extension unit and a high-voltage electricity getting device. A current signal of a power transmission line is collected by the three sensors and the signal is processed. After a voltage value of tested current is calculated, detection information is transmitted through a wireless communication network. The high-voltage electricity getting device can be used for supplying electric energy to online monitoring equipment for a long time by getting energy through a current transformer and cooperatively supplying power with a lithium cell. According to the unipolar current-voltage integration sensor disclosed by the invention, current and voltage information can be transmitted to the computer to be subjected to data processing rapidly, integrally and accurately; high voltage, large current and ferromagnetic resonance cannot be generated; the sensor can be conveniently connected with an electronic instrument and micro-computer measurement and control protection equipment; the system structure is simplified; the space is saved; the energy consumption is very low; and the stability and the accuracy of the whole system are improved.

The frequency conversion driving gear of the 3KV-10KV middle and high voltage multilevel three-phase alternating current motor belongs to the field of the high voltage converter technique. The main circuit is composed of the multi-winding assistant side phase shifting isolating transformer and several H bridge power units with the three levels of alternating-direct- alternating. The commutation part of every power unit is three-phase diode commutate with no controlling, the middle direct current tache connects with the capacitor parallelly and the inverted part is the three-level H bridge construction and adopts the diode clamp or the capacitor clamp three-level structure. The voltage of the unit clamping capacitor is controlled dynamicly. The main switch devices can choose the corresponding withstand voltage and current power semiconductor switch devices according to the difference of the grades of the output voltage and the current. Several groups of power unit output are in the form of Y after being connected in series. The controller takes the high performance digital signal microprocessor as the center to form the PWM control signal and dynamicly controls the balance of the voltage of the power unit clamping capacitor. It reduces the number of the assistant boarders of the phase shifting transformer and decreases the cost. The dynamic control policy adopted by the voltage of the clamping capacitor increases the performance.

Aiming at the condition that primary line current and voltage are not easily monitored by a sensor due to high voltage and large current when a high voltage circuit breaker works online, the invention provides an online monitoring method and an online monitoring device of a high voltage vacuum circuit breaker. The method comprises the steps of: using a displacement sensor directly connected with a moving contact of the high voltage circuit breaker to collect a stroke signal of the moving contact; calculating characteristic points on a stroke curve through a series of filtering and correction; and analyzing the characteristic points to calculate relevant parameters so as to judge the work condition of the circuit breaker online. The online monitoring method and device provided by the invention effectively monitor the high voltage circuit breaker online and can resist the monitoring environment of high voltage and large current. As the displacement sensor directly connected with the moving contact of the circuit breaker is just used as a unique signal collecting device in the invention, the problem of difficulty in implementation and high cost caused by the fact that high voltage resisting voltage or current sensors are needed to be used on a primary side line is solved.

A method and a device for limiting secondary arc current of an extra-high voltage/ultra-high voltage double circuit line on the same tower. The method comprises the following steps: determining the type of a single-phase-to-ground fault when the extra-high voltage/ultra-high voltage double circuit line on the same tower has a single-phase-to-ground fault (S501); selecting a reactance value of a neutral grounding reactor according to the type of the single-phase-to-ground fault (S502); and switching the extra-high voltage/ultra-high voltage double circuit line on the same tower to the selected reactance value of the neutral grounding reactor (S503). Thus the reactance value of the neutral grounding reactor is not constant, but is changed along with the operating conditions of the power transmission line, that is, the reactance value of the neutral grounding reactor is controllable. In this way, when the operating conditions of the extra-high voltage/ultra-high voltage double circuit line on the same tower are different, a neutral grounding reactor with an optimal reactance value can be selected so as to be accessed to the power transmission line, thereby effectively limiting the secondary arc current caused by the single-phase-to-ground fault.

High voltage high current regulator circuit for regulating current is interposed between first and second terminals connected to an external circuit and comprises at least one main-current carrying cold-cathode field emission electron tube conducting current between the first and second terminals. First and second grid-control cold-cathode field emission electron tubes provide control signals for first and second grids of the at least one main-current carrying cold-cathode field emission electron tube for positive and negative excursions of voltage on the first and second terminals, respectively. The current regulator circuit may be accompanied by a voltage-clamping circuit that includes at least one cold-cathode field emission electron tube. At least two cold-cathode field emission electron tubes, configured to operate at high voltage and high current, are preferably contained within a single vacuum enclosure and are interconnected to provide a circuit function, so as to form a high voltage high current vacuum integrated circuit.

The present invention includes processes and packaging for high voltage integrated circuits (ICs), high voltage electronic devices and high voltage electronic circuits which operate over a wide range of voltages, e.g., from tens of volts to tens of thousands of volts. The inventive processes and packaging are particularly suitable for integrating low or lower voltage circuits or transistors to form high voltage ICs, high voltage electronic devices and high voltage electronic circuits. The inventive processes and packaging are also particularly suitable for isolating high voltage electronics to achieve high breakdown voltages and for supporting high voltage operation. The inventive processes may be used with any suitable semiconductor materials using conventional semiconductor fabrication and related facilities.

The invention discloses a topological structure of a high-power density power electronic transformer and a control method for the topological structure. A group of series resonance circuits (or band-pass filters formed by other components) are added to a bridge arm branch with N cascaded H bridge submodules at a high voltage AC side, and meanwhile, a high-frequency signal is superposed into a modulating wave signal to transmit energy of the high voltage AC side to a low voltage side in a high frequency manner. According to the topological structure, one series resonance circuit is directly formed through cascaded H bridges, an LrCr series resonance circuit and a high-frequency isolation transformer at the high voltage side to output a high-frequency waveform and to achieve energy transmission. A large number of DC-DC conversion modules are saved, meanwhile, power switching devices applied to the high voltage AC side are also greatly reduced, the volume and the cost of a system are greatly reduced, the work efficiency of the system is improved and the power density of the power electronic transformer is improved.

The invention discloses a voltage detection circuit which can be used for detecting a lower first voltage power source and a higher second voltage power source. The same resistance detection circuit is used by both the higher voltage power source and the lower voltage power source, and a first voltage detection end which is separated from the resistance detection circuit is connected with a voltage protection circuit and then connected to a follow-up first comparator. The voltage protection circuit comprises a first N-channel metal oxide semiconductor (NMOS) tube with a high voltage and a transistor tandem cascading structure which is formed by connecting a plurality of diode-connected metal oxide semiconductor (MOS) tubes in series. When a high-pressure alarm is carried out, the voltage protection circuit enables the high voltage of the first voltage detection end to be released, the voltage which is input to the first comparator is enabled to be clamped in a low voltage and the first comparator is enabled to be produced by low-pressure devices, thus the speed of a low-pressure alarm is improved and the area of circuits is reduced. The voltage detection circuit is capable of greatly reducing the area of the circuits further by sharing the resistance detection circuit.

At present, strong extra-high voltage direct-current electric power transmission grids are built in China. Energy is needed to be stored in a storage battery and then transmitted to the grid or the storage battery is needed to be hung on the direct-current electric power transmission grid because of the randomness of power supply from new energy resources. However, a bidirectional direct-current converter has the characteristic of implementing bidirectional flow of the energy through a set of hardware, so that the bidirectional direct-current converter which is suitable for energy transmission between the high voltage electric power transmission grid and the storage battery becomes a hot topic in the research. The invention provides a bidirectional direct-current converter with high buck-boost ratio, which can be applied to high-voltage and high-power applications. Through the invention, the problem of the flow of the energy among modules after the original bidirectional converter is connected in series or parallel. The circuit of the bidirectional direct-current converter is characterized in that a main circuit is a two-stage bidirectional converter, wherein the front stage is an original-edge inversion auxiliary edge rectification type direct-current converter, and the rear stage is a BUCK-BOOST type bidirectional converter. The control mode is that each module is independently controlled so that staggered-frequency control is realized, electromagnetic interference is reduced and the voltage isolation level of drive signals is effectively lowered.

The invention discloses a mixed type direct-current circuit breaker and a switching-off method thereof. The circuit breaker consists of multiple serially connected same circuit breaker modules. Each circuit breaker module comprises a main current loop, a current transferring branch, an overvoltage limiting branch and an online monitoring system. A high speed mechanical switch, the current transferring branch and the overvoltage limiting branch are parallelly connected. Through serial connection of the multiple serially connected same circuit breaker modules, the application voltage grade can be increased; breaking of a short circuit of a high voltage system is achieved; and by controlling parts of the circuit breaker modules to carry out switching-off actions, a short circuit current limiting function under the condition of the high voltage grade is achieved.

Systems, methods and apparatus for coexistence of high voltage and low voltage devices and circuits on a same integrated circuit fabricated in silicon-on-insulator (SOI) technology are described. In particular, techniques for mitigating back gate effects are described, including using of resistive and/or capacitive couplings to control surface potentials at regions of a substrate used for the SOI fabrication proximate the high voltage and low voltage devices and circuits. In one case, an N-type implant is used to provide a high potential differential with respect to a substrate potential.

The invention discloses a high-voltage isolated gate bipolar transistor (IGBT) converter module, which adopts a drawer or vertical structure in which each component is mounted therein in a laminated way. A radiator is arranged at the bottom of the converter module; high-voltage IGBT components are arranged above the radiator and are uniformly arranged on the upper surface of the radiator; a high-voltage low-sensitivity busbar is arranged above the high-voltage IGBT components and is conductively connected with the IGBT components; an alternating current busbar is arranged above the horizontal side of the high-voltage low-sensitivity busbar and is conductively connected with the high-voltage IGBT components; a control box is arranged above the alternating current busbar and is fixed on the radiator; a gate driving power is arranged in a power box beside the control box; and a high-voltage gate driving circuit is arranged in a driving mounting box on the upper layer of the converter module. The converter module is simple in structure, attractive in appearance, safe and reliable, excellent in each performance and good in maintainability and interchangeability, and can meet the high-voltage large power occasions of intercity power train units, maglev trains, locomotives and the like.

The invention brings forward an all-optical high-voltage voltage transformer. The voltage transformer comprises a high voltage induction device, a shielding insulation device, a sensing head and a photoelectric unit, wherein the high voltage induction device, a shielding insulation device, a sensing head are at a high voltage side and the photoelectric unit is at a low voltage side. Light that is emitted from a light source passes an optical path portion and is divided into two beams of orthogonal linearly polarized lights that are transmitted to the sensing head through a polarization maintaining fiber. Under the effect of an electric field, the sensing head enables the two beams of linearly polarized lights to generate a phase difference; and vibration directions of the two beams of linearly polarized lights are respectively rotated by 90 degrees, so that mode exchange of the two beams of the lights is realized. The two beams of linearly polarized lights that are returned from the sensing head is transmitted back to the optical path portion through the polarization maintaining fiber so as to carry out interference; and a circuit portion detects an interference light intensity signal and carries out signal processing; and then, a digital signal is formed and is output. According to the invention, the transformer enables completely isolation between a high voltage side and a low voltage side as well as has advantages of high security, strong anti-interference capability, small volume, light weight and simple structure and the like; and network and digitlization are easy to realize. Besides, a frequency response is wide, the dynamic scope is large and measurement precision is high.

The invention discloses a processing method when high-voltage high-power frequency converter has failure in power module, including the following steps: 1, when the system detects a failure in some power module, it will block the output, and then triggers the bypass circuit in order to keep connection between other modules; 2, it regulates the given voltage of the power module to make keep three-phase output line voltages still balanced, that is, their amplitudes are equal, and their phases are shifted by a 120-degree angle, and enhance the voltage output ability of the frequency converter as fully as possible.