48results about How to "Reduce the maximum voltage" patented technology

DC-DC converters adapted to provide two or more DC output voltages. More particularly, a multi-state or mode DC-DC converter circuit comprising first and second controllable switches configured for unidirectional conduction of charging current.

The present invention relates to a coil arrangement, in particular for use in a magnetic particle imaging apparatus (100), comprising a coil split into at least two coil segments, wherein the winding direction is inverted between at least one coil segment to another coil segment, and a capacitor coupled between at least two adjacent coil segments. Further, the present invention relates to such a magnetic particle imaging apparatus, in particular an apparatus (100) for influencing and / or detecting magnetic particles in a field of view (28), which apparatus comprises selection means and drive means (120) wherein at least one drive field coil and / or at least one selection field coil representing a selection field element is implemented by a coil arrangement as proposed according to the present invention.

The invention provides a high-voltage tolerance output buffer, comprising an input module, a pulling up module, a pulling down module, an enable control module and a voltage limiting module, the input end of the input module is connected with an input signal and an output enable signal, the voltage limiting module is connected with an inverter, the output signal of the inverter controls the conduction of the voltage limiting module, and the input signal of the inverter is the non output enable signal; the high-voltage tolerance output buffer effectively improves the performance of a standard input and outlet circuit which is used as an open-drain circuit to output waveform, reduces the tolerant maximum voltage of a voltage limiting transistor, improves the reliability of the circuit and ensures the stable operation of the while circuit.

A light-emitting element driving device includes: a plurality of light emitters; a power supply; a plurality of current control transistors; a plurality of constant-current circuits; a voltage selecting circuit; a control circuit; and a voltage controller.

The invention discloses an axial double-split dry-type transformer coil structure with the same connection groups and a winding method. The axial double-split dry-type transformer coil structure comprises a first low-voltage coil, a second low-voltage coil and a group of high-voltage coils, wherein each of the first low-voltage coil and the second low-voltage coil is provided with two low-voltage coil sections, the two low-voltage coil sections of the first low-voltage coil and the two low-voltage coil sections of the second low-voltage coil are distributed in a cross mode, and two sections of leads for winding forming of the first low-voltage coil and the second low-voltage coil are leaded in and out from the upper end and the lower end respectively. The high-voltage coils are provided with multiple high-voltage coil sections distributed in the axial direction, the high-voltage coil sections are sequentially and mutually connected in series, and leads for winding forming of the high-voltage coils are leaded in and out from the upper end and the lower end respectively. The axial height of the first low-voltage coil and the axial height of the second low-voltage coil are both consistent to the axial height of the high-voltage coils.

The present invention provides a semiconductor integrated circuit capable of achieving high voltage. The proposed semiconductor integrated circuit includes a first node [VOUT] connected to a first potential node [VDD], and a first n-channel transistor [NT1] and a second n-channel transistor [NT2] serially connected between a first node [VOUT] and a second potential node [VSS] of a lower potential than the first potential node. One end of NT1 is connected to the second potential node [VSS], the other end thereof is connected to one end of the second n-channel transistor [NT2], a gate terminal thereof is connected to a second node [VIN], the other end of NT2 is connected to the first node [VOUT], and a gate terminal thereof is connected to a first intermediate range potential [VM1] positioned between the first potential node [VDD] and the second potential node [VSS].

Negative voltage decoding circuit belongs to technique area for designing hybrid signal processing IC and not volatile memory circuit. The characters are as follows. First stage of negative voltage level transfer circuit contains an inverter composed of PMOS tube and NMOS tube as well as a CMOS inverter. The input end and output end of said PMOS tube and NMOS tube are connected so as to constitute positive feedback channel of output voltage. PMOS tube transfers positive voltage, and NMOS tube transfers negative low voltage. CMOS inverter makes asymmetric branch currents at two sides. Two PMOS tubes determine initial input voltage of the two inverters. NMOS tube with its grid electrode being connected to positive high voltage transfers output earth level when the fetch-discharge channel reads level normally. Thus, transferring loss of PMOS tube is avoided. The invention possesses features of fast level conversion speed, increasing capability of reducing size of transistor.

In displaying a predetermined image on a plasma display panel, occurrence of an initializing bright point can be suppressed to reduce the maximum voltage in an all-cell initializing operation, light emission in the all-cell initializing operation is suppressed to reduce the black luminance, and the contrast is sharpened. In driving the plasma display panel, one field period includes a plurality of subfields having a setup period for causing initializing discharge in discharge cells, an address period, and a sustain period. One field period includes at least one subfield for applying ramp waveform voltage increasing in the setup period to the scan electrodes. The maximum voltage of the ramp waveform voltage can be varied. When a predetermined image establishing a previously determined condition is displayed, the ramp waveform voltage is generated whose maximum voltage is smaller than when an image other than the predetermined image is displayed, and a positive voltage is applied to the data electrodes at least while the ramp waveform voltage having the smaller maximum voltage is applied to the scan electrodes.

A system, e.g. an integrated circuit or part, may include a plurality of pads, e.g. digital I / O pads, each comprising a physical pad and associated pad circuit. In case of an ESD event affecting one or more of the digital I / O pads, PMOS devices configured in an output buffer section between an I / O pad supply rail and the physical output pad—within their respective pad circuits in the affected digital I / O pads—may all be turned on in response to the ESD event. This may allow the capacitance of each pad, in some cases approximately 3 pF capacitance per pad, to charge up, absorbing the energy of the ESD event and reducing the peak voltage the integrated circuit or part experiences as a result of the ESD event. The reduced peak voltage may be directly correlated with improved ESD performance of the product.

The invention discloses a double-frequency circulating current injection method for suppressing capacitor voltage fluctuation of an MMC sub-module under a fault. The method comprises the steps: taking the fundamental frequency and double-frequency fluctuation components of capacitor voltage of the sub-module which generates an AC single-phase fault and considers double-frequency circulation injection as suppression targets, and building an optimization target function; carrying out global optimization by taking target function minimization as a target to obtain optimal amplitude and phase of double-frequency circulating current injection; and generating a reference signal according to the optimal amplitude and phase of the double-frequency circulating current injection, and realizing the double-frequency circulating current injection in combination with a modulation algorithm. According to the method, the capacitor voltage fluctuation of the sub-module during the fault period can be effectively reduced, and the maximum voltage borne by the MMC sub-module during the fault period is reduced.

The invention discloses a frequency-doubled circulation injection method for suppressing MMC bridge arm power fluctuation under a fault, and the method comprises the steps: taking a fundamental frequency and a frequency-doubled fluctuation component of bridge arm instantaneous power when an AC single-phase fault occurs as suppression targets, and building an optimization target function; carrying out global optimization by taking target function minimization as a target, and obtaining the optimal amplitude and phase of frequency-doubled circulation injection; and generating a reference signal according to the optimal amplitude and phase of the frequency-doubled circulation injection, and realizing the frequency-doubled circulation injection in combination with a modulation algorithm. According to the method, the capacitor voltage fluctuation of the sub-module during the fault period can be effectively reduced, and the maximum voltage borne by the MMC sub-module during the fault period is reduced.

Problems can be solved about reducing the maximum voltage, reducing the size and cost, and so on. According to the invention, three or more discharge units are connected in series between two conductors. Two or more clamping type overvoltage protective units (hereinafter referred to as “clamping units”) are connected in parallel to the discharge units except one or more of the discharge units. The overall operating voltage of the discharge units arranged in parallel to all the clamping units is set lower than any voltage obtained by subtracting from the operating voltage of each clamping unit, the spark-over voltages of the other discharge units connected in parallel to the clamping unit. The overall operating voltage of the discharge units connected in parallel to all the clamping units is set higher than the operating voltage of each discharge unit connected in series to any one of the clamping units.

The present disclosure is applied to touch technology, and provides an integrating circuit. The integrating circuit comprises an impedance unit, an amplifier, an integration capacitor, a discharge capacitor, a first switch and a second switch. The amplifier comprises a first input terminal, a second input terminal and an output terminal configured to output an output signal; the integration capacitor is coupled between the first input terminal and the output terminal; the first switch is coupled between the first input terminal of the amplifier and the second terminal of the discharge capacitor; and the second switch is coupled between the first terminal and the second terminal of the discharge capacitor.

An electrical system includes a battery disconnect unit (BDU) connected to a rechargeable energy storage system (RESS) via a high-voltage bus. The BDU has one or more contactors that close responsive a low-voltage drive current to thereby connect the RESS to the high-voltage bus. A low-voltage drive circuit conducts the drive current to the contactor(s). Opening of a low-voltage connection interrupts the drive current and causes the contactor(s) to transition from the closed state to an open state. The contactor(s) open in response to interruption of the drive current to thereby disconnect the RESS. The contactor(s) may be closed again after a lockout safety procedure, such that reestablishing the electrical connection does not itself re-energize the high-voltage bus. An electrified powertrain includes a transmission, electric machine, power inverter module, and the above-noted electrical system.

The invention relates to a dry-type transformer used for an ozone generator, which comprises a casing, a high-tension coil and a low-tension coil. The high-tension coil and the low-tension coil are arranged inside the casing and are wound to enhance mechanical strength and reduce leakage inductance. An insulating cylinder is arranged between the high-tension coil and the low-tension coil, and an axial ventilation heat radiating hole is formed on the insulating cylinder. A shielding layer is arranged outside the casing to effectively reduce the influence of electromagnetic radiation on the surroundings. The inventive dry-type transformer has a large contact area between the high-tension / low-tension coil and the air, thereby having the advantages of good heat radiating and ventilation performance and strong overload capacity, having larger redundancy of coil temperature rise due to the limitation of load loss sometimes, and further improving the reliability of the transformer. Moreover, the dry-type transformer reduces the contaminating and damping extents of coils. With the improvement of the insulation treatment process of insulating materials and coils, the wearing and the noise are well controlled.

An electrical system includes a high-voltage bus connected to a rechargeable energy storage system (RESS) and a high-voltage component connected to the RESS via the voltage bus. The component defines a service opening spanned by a removable cover. The electrical system may include a fastener connecting the cover to the component, as well as a battery disconnect unit (BDU) having a high-voltage switch device connecting the RESS to the high-voltage bus. The switch device closes responsive to a low-voltage drive current to connect the RESS to the high-voltage bus. A drive circuit conducts the current to the switch device. An electrical connector has multiple connector pieces collectively forming a switch in the drive circuit. Disconnection of the pieces from each other opens the switch to interrupt the drive current and cause the high-voltage switch device to open, which disconnects the RESS from the high-voltage bus.

The invention discloses a dead zone compensation method and device based on asymmetric vector action time. The method comprises the following steps: calculating a dead zone equivalent time error according to inherent dead zone time of a driver, a switching state switching sequence, a current direction, a switching tube voltage drop and a diode voltage drop; and after the switching moment generatedby the dead zone effect is determined according to the current direction, adding the dead zone equivalent time error at the switching moment generated by the dead zone effect, and carrying out out dead zone compensation. The invention solves the problems that: in the prior art, only a dead zone of a system is compensated, but smooth transition during sector switching in the compensation process is not considered, the inverter generates the phenomenon that the two-phase switching state is changed at the same time, then the output level is subjected to non-unit mutation, therefore the action effect of dead zone compensation is affected, in addition, the maximum voltage and power loss borne by the power switch tube are increased, the device explosion is caused, and the like.

The invention discloses a full DC (Direct Current) electric energy converging system of a wind power station. The full DC electric energy converging system of the wind power station is composed of SRG (Switched Reluctance Generator) systems and DC conversion circuits thereof, electric power electronic switches and electric power lines, wherein multiple SRG systems and the DC conversion circuits thereof are firstly connected in series to form a branch circuit; branch circuits which are composed of the SRG systems and the DC conversion circuits in the same number are connected in parallel; same polar ends of parallel and adjacent SRG systems and the DC conversion circuits of different branch circuits are connected by virtue of the electric power electronic switches; each SRG system and the DC conversion circuit thereof is composed of an SRG system and a DC conversion circuit; each SRG system is connected with each DC conversion circuit; each DC conversion circuit is composed of a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a resistor R3, a diode VD, an electric power electronic switch VT1, an electric power electronic switch VT2, an electric power electronic switch VT3 and an electric reactor L. The full DC electric energy converging system of the wind power station is simple in structure, small in volume, low in loss, high in power transmission benefit and low in cost.

The invention discloses a stroboflash-free active power factor correcting circuit applied to LED drive. The stroboflash-free active power factor correcting circuit applied to LED drive comprises a rectifying circuit, a filtering capacitor, a first-level inductor, a control chip, a power tube, a transformer and an LED load circuit and is characterized by further comprising an energy storage capacitor, a first switch tube and a second switch tube, wherein one end of the first-level inductor is connected with the output end of the rectifying circuit, the other end of the first-level inductor is connected with the drain electrode of the power tube and the positive pole of the energy storage capacitor, the transformer comprises at least one main coil, one end of the main coil of the transformer is connected with the source electrode of the power tube through a sampling resistor, and the other end of the main coil of the transformer is in parallel connection with the negative pole of the energy storage capacitor. The stroboflash-free active power factor correcting circuit provides direct current constant source through the energy storage capacitor, two times of ripple waves of power frequency are eliminated, no stroboflash is output while power factor correction, the circuit is simplified, and cost is reduced.

The invention discloses a permanent-magnet speed-adjustable motor which comprises a motor base, wherein an outer rotor assembly and an inner rotor assembly are respectively arranged on the motor baseand at the two ends in the length direction of the motor base through bearings; the outer rotor assembly comprises a first rotating shaft, collecting rings are arranged on the first rotating shaft, abarrel-shaped iron core retainer is arranged at one end in the motor base of the first rotating shaft, an outer rotor iron core and a plurality of induction coils matched with the outer rotor iron cores are arranged in the iron core retainer, the output ends of the induction coils are connected with the collecting rings, the group number of the induction coils is 3N (the N is an integer), the group number of the induction coils is larger than or equal to 6, the number of the collecting rings is 3N, every three groups of induction coils can form a three-phase potential, and N three-phase potentials with the completely same phases can be achieved.

The invention discloses a mains supply fluctuation-resistant charging method, a charging terminal and a computer readable storage medium. The method comprises the following steps: dividing the charging process of a battery pack into a plurality of charging stages, and using different charging currents in each stage; and when the charging process is interrupted and recovered, reducing the range points of the plurality of charging orders to divide a new charging stage range, and after the charging stage of the current battery pack is re-judged, charging the battery pack by using the charging current corresponding to the charging stage. The problems that the battery cannot be fully charged and potential safety hazards exist due to overlarge charging current caused by the fact that the current charging stage is judged to be the previous charging stage because the judgment of the battery management system on the current charging current of the battery pack is influenced because the voltage of the battery pack is reduced after the charging process is interrupted are avoided.

DC-DC converters adapted to provide two or more DC output voltages. More particularly, a multi-state or mode DC-DC converter circuit comprising first and second controllable switches configured for unidirectional conduction of charging current.

A system for generating inductively coupled plasma (ICP) according to an embodiment of the present invention includes: a dielectric tube which extends in the length direction; a first induction coil structure which is disposed to enclose the dielectric tube and generates inductively coupled plasma in the dielectric tube; an RF power source which provides a positive output and a negative output having opposite phases, supplies respectively the positive output and the negative output of RF power to both terminals of the first induction coil structure, and changes a driving frequency; a first main capacitor disposed between a positive output terminal of the RF power source and one terminal of the first induction coil structure; and a second main capacitor disposed between a negative output terminal of the RF power source and the other terminal of the first induction coil structure. The first induction coil structure includes: induction coils which are connected in series and respectivelydisposed on different layers, and have at least one turn in each layer; and auxiliary capacitors which are respectively disposed between adjacent inductor coils so as to distribute voltages applied tothe induction coils.

A fluid treatment device includes an AC power source connected to first, second and third conductors. A electromagnetic field generating device is positioned adjacent to a fluid conduit, electrically connected to the first and third conductors to form a first circuit. A second electromagnetic field generating device is positioned adjacent to a second fluid conduit, electrically connected to the second and third electrical conductors to form a second circuit. A circuit element in the first circuit initiates a high frequency electromagnetic field at said first electromagnetic field generating device during a first half of the AC wave form in the first circuit, and a circuit element in the second circuit initiates a high frequency electromagnetic field at said first electromagnetic field generating device during a second half of the AC wave form in the second circuit.

The invention discloses a soft-switching DC-DC converter. The converter comprises an input power supply (Uin), a load (load), a first filter component (101), a first switch tube component (102), a parallel resonant tank (103), a diode component (104), and a second switch tube component (105) and a second filter assembly (106), the switch assembly (S1) in the first switch tube assembly (102) adopts two forms of anti-blocking and anti-parallel, so that the switches in it can realize zero-voltage conduction Turn-on and zero-voltage turn-off effectively improve the efficiency of the converter. By adding the diode component (104), the voltage borne by both ends of the switch tube in the switch component (S1) and the peak value of the reverse voltage borne by the diode are effectively reduced, thereby reducing the requirements of the converter on the switch tube. Thus, the cost of the converter is effectively reduced, and the efficiency, safety and reliability of the system are improved.

The present invention discloses a low voltage DC-DC converter for a vehicle and a control method thereof. The low voltage DC-DC converter for a vehicle includes: a switching circuit including a plurality of capacitors and a plurality of switches and converting a high voltage output from a high voltage battery into an AC voltage; a transformer converting the AC voltage output from the switching circuit into a low voltage; a current sensor measuring a current value output from the transformer; and a controller comparing the current value measured by the current sensor with a reference value to determine whether a current mode is a continuous current mode or a discontinuous current mode, and controlling one of the plurality of switches to be turned on or off as the determination result.