136results about How to "Increase input voltage" patented technology

A multi-mode multi-coupling multi-protocol wireless power transmitter (WPT) and its embodiments transmit power to a wireless power receiver (WPR) in a power transfer mode (PTM) and a wireless power protocol (WPP) of the WPR. A first circuit of the WPT includes inductors or capacitors emanating power via a magnetic field or electric field PTM respectively. The WPT sequentially parses a test condition to identify a PTM, a power coupling linkage (PCL) between the WPT and the WPR, and a WPP of the WPR. The WPT identifies a match if the PTM of the first circuit and the WPP of the switch network, the variable matching circuit, a modulator / demodulator block or an out-of-band communication block, and a control logic circuit of the WPT match the PTM and the WPP of the WPR to transmit power to the WPR based on the match.

A circuit device for providing energy to at least one electrical component, such as a light emitting diode (LED). The circuit device comprises a positive contact, an inductor, a diode and a negative contact in series. A first component contact for electrical connection to a cathode end of an electrical component, a second component contact for electrical connection to an anode end of an electrical component, a switch and a control device are also included. The first component contact is electrically connected to a junction between the positive contact and one end of the inductor; and the second component contact is electrically connected to a cathode end of the diode. There are also provided a circuit device further including an LED, an assembly including a circuit device and a bulb base, a flashlight including an assembly, and a method of directly replacing a flashlight bulb.

A method of providing ride-through capability in a chiller / refrigeration system employs a variable speed drive with an active converter stage, a DC link stage and an inverter stage for providing variable frequency and voltage to power at least one motor. An induction motor is coupled to the output of the inverter stage for driving a compressor in the chiller / refrigeration system. The ride-through method comprises operating the active converter to regulate the DC link voltage of the DC link stage to a predetermined voltage level until the current through the active converter equals a predetermined current limit, then transferring regulation of the DC link to the inverter upon reaching the current limit of the converter. The compressor is unloaded, and the power flow through the inverter is reversed to maintain the voltage level of the DC link stage. Pre-rotation vanes, slide valve, or check valve are used to unload the compressor.

On end of a reactor (L1) is connected to a positive electrode of a battery (B1) and the other end is connected to a power line via a transistor (Q1) and to the ground via a transistor (Q2). By PWM control of the transistors (Q1, Q2), an arbitrary increased voltage is obtained in the power line. It is possible to obtain an optimal inverter input voltage (power line voltage) according to the motor drive state, thereby increasing efficiency. Thus, it is possible to optimize the inverter input voltage according to the motor drive condition.

A resonant conversion system is provided, in which a resonant converter receives an input voltage to generate an output voltage, and a buck converter provides the input voltage of the resonant converter, and controls the input voltage to perform an over-current protection process.

The embodiment of the invention provides a multi-chip packaging structure and a multi-chip packaging method. n chips are sequentially stacked and arrayed on a chip loading platform; moreover, each chip partially covers the chip of the lower layer, so that a pad of the chip of the lower layer is exposed; a second bonding lead connects the pad on one chip to the pad on the other chip; and a first bonding lead connects the pad to a pin, accordingly, a minimum packaging area is obtained, moreover, the lengths of the first bonding lead and the second bonding lead are shortest, the powder loss which is caused by the self resistances of the bonding leads is lowered, and the reliability of the lead bonding is improved.

A driver circuit for driving light emitting diodes (LEDs). The driver circuit includes: a string of LEDs divided into n groups, the n groups of LEDs being electrically connected to each other in series, a downstream end of group m-1 being electrically connected to the upstream end of group m, where m is a positive number equal to or less than n. The driver circuit also includes a plurality of current regulating circuits, each of the current regulating circuits being coupled to the downstream end of a corresponding group at one end and coupled to the ground at the other end and including a sensor amplifier and a cascode having first and second transistors, each sensor amplifier being coupled to a different voltage source for providing a different reference voltage thereto.

An apparatus for driving LEDs using high voltage includes a plurality of LEDs divided into a plurality of LED segments connected in series with a switching voltage detector and a current limiting device. Each of the plurality of LED segments is connected in parallel with a switching device. A high input voltage supplies power to the apparatus. The switching voltage detector generates a first mode change signal when the input voltage increases and a second mode change signal when the input voltage decreases. A switch controller receives the two mode change signals and generates a plurality of switching control signals to respectively control the switching devices of the plurality of LED segments.

The invention provides an air amount control method and device of a fresh air system. The method includes the steps that after the current output air amount and target output air amount of the fresh air system are obtained, the mathematic relation between the current output air amount and target output air amount of the fresh air system is judged; if the current output air amount of the fresh air system is smaller than the target output air amount, it means that the amount of fresh air conveyed indoors is insufficient, a control instruction is sent out to a power source of a motor of the fresh air system, the voltage from the output end of the power source to the motor is increased so as to increase the current input voltage of the motor of the fresh air system, and therefore the rotating speed of the motor of the fresh air system is increased, the current output air amount conveyed indoors of the fresh air system is increased, and the output air amount balance can be maintained.

A differential input comparator circuit comprises an input stage comprising dual polarity input voltages and an output stage adapted to output a differential voltage based on the input voltages, wherein the differential voltage is adapted to be transmitted to a comparator and wherein the circuit has high input impedance and works with high input voltage swings.

The present application relates to a breast pump system comprising a vacuum pump, an actuator for driving the vacuum pump, and a power supply for supplying electrical power to a plurality of components including the actuator, and also to a method for use in such as system. An output voltage of the power supply is detected, and in response to the detected output voltage being less than a first threshold voltage, the supply of electrical power to a predetermined one of the plurality of components is suspended. Then, if the detected output voltage recovers to a level above a second threshold value, the supply of electrical power is resumed.

The invention, which belongs to the signal processing technology field, discloses an optimization method based on traditional phase difference measurement and a circuit. According to the method, two sinusoidal signals with different frequencies or a same frequencies pass through a signal collection circuit, an amplification circuit, and a comparison circuit as well as two paths of rectangular wave signals pass through an OR gate circuit so as to obtain a needed pulse signal; AD sampling is carried out so as to obtain a pulse width and a time difference of signal zero crossing, so that a phase difference is calculated. According to the invention, because a special circuit design is employed, phase drift generated by hardwares of a traditional zero cross detection circuit itself can be substantially changed, so that correlated subsequent processing of the phase difference on software becomes easier; therefore, the strong practicality is realized.

The invention carries out field weakening control on a brushless motor without use of preset controlled variables, such as table values, and independently of the input voltage of an inverter circuit 3 in a motor driving device that drives the brushless motor. The motor driving device comprises an inverter circuit 3 that converts the output voltage of a voltage source 1 into a three-phase alternating current, and outputs it to a motor 2; a rotor position estimating unit 5 that estimates the rotor position of the brushless motor; and an inverter control unit 4a that controls the inverter circuit 3 so that the brushless motor is driven by a current based on the estimated rotor position. The inverter control unit 4a determines a value [beta] of advance angle, which is the advance angle of a current supplied to the brushless motor relative to the estimated rotor position, so that the difference between commanded number of revolutions fo and actual number of revolutions f is minimized.

A driver circuit for driving light emitting diodes (LEDs). The driver circuit includes: a string of LEDs divided into n groups, the n groups of LEDs being electrically connected to each other in series, a downstream end of group m−1 being electrically connected to the upstream end of group m, where m is a positive number equal to or less than n. The driver circuit also includes a power source coupled to an upstream end of group 1 and operative to provide an input voltage and a plurality of current regulating circuits, each of the current regulating circuits being coupled to the downstream end of a corresponding group at one end and coupled to a ground at the other end and including a sensor amplifier and a cascode having first and second transistors.

Each driver circuit for a six-by-four array of light emitting diodes illuminating a pushbutton switch switches three pairs of the light emitting diodes between series connection and parallel connection based on changes to an applied input voltage. Driving six light emitting diodes instead of only four allows illumination of a larger area and improves power efficiency at higher applied input voltages, while retaining dimming compatibility at low voltage levels. Each driver circuit also includes a rectifier allow illumination of the pushbutton switch with direct current voltages of either polarity. The quiescent current limiting resistance is split into multiple resistors for further improved power efficiency. Each driver circuit also includes a bridge rectifier to allow illumination of the pushbutton switch with direct current voltages of either polarity or alternating current voltages.

The invention discloses a high-order LCLCL direct-current converter based on harmonic optimization and a parameter design method, and belongs to the field of power supply power converters. The invention aims to solve the problem that the LLC resonant converter needs to be subjected to frequency conversion control to realize stable voltage output, and the efficiency is reduced. The converter comprises a band-stop filter inductor and a band-stop filter capacitor which are connected in parallel to form a band-stop filter. The drain electrode of the switch tube S1 is connected with the positive electrode of the power supply, the source electrode of the switch tube S1 is connected with the drain electrode of the switch tube S2, and the source electrode of the switch tube S2 is connected with the negative electrode of the power supply. The resonant capacitor, the resonant inductor, the primary side of the transformer and the band elimination filter are sequentially connected in series between the drain electrode and the source electrode of the switching tube S2. One end of the secondary side of the transformer is connected with the anode of a diode D1, the cathode of the diode D1 is connected with the cathode of a diode D2, and the anode of the diode D2 is connected with the other end of the secondary side of the transformer. An output capacitor is connected between the center tap ofthe secondary side of the transformer and the cathode of the diode D2. The converter has a wide variable-frequency voltage regulation curve and a high-slope drop gain curve.

An embodiment of the present application discloses a photovoltaic power generation inverter system, which is used for increasing an input voltage and a grid-connected voltage of an inverter under thesame power conversion conditions, and reducing an energy loss in the photovoltaic power generation inverter system. A method for apply that invention comprises the follow steps: a photovoltaic array,a DC conversion unit, a bus unit and an inverter unit; Wherein the photovoltaic array is one or more pairs of photovoltaic arrays, and each pair of photovoltaic arrays comprises two photovoltaic arrays, wherein the DC conversion unit comprises a first stage DC-DC converting DC sub-unit, a second stage DC-DC converting DC sub-unit and a cascade sub-unit, and the number of the DC conversion units isat least one; When the inverter works normally, the bus voltage and the grid-connected voltage in the photovoltaic inverter system are increased, so that the current is reduced, and the energy loss of the system is reduced by the coupling connection or decoupling function of the cascaded sub-units.

The invention discloses a wire-tubular-type low temperature plasma unit reactor for treating industrial waste gases and an assembly system thereof. The unit reactor is composed of a reactor positive electrode, a circular pipe external electrode and a sealing ring. The reactor positive electrode is formed by central electrodes with different types and insulation components. The insulation supports on the insulation components are stuck into rolled steel grooves of the circular pipe external electrode to form the unit reactor. According to actual requirements of waste gas treating engineering, N unit reactors are employed to be assembled in series and parallel ways and a reactor matrix is formed. The reactor matrix and compression screws are assembled to form a single-box reactor through reactor supporting plates. The single-box reactors are connected in series and electrically connected through box body seal heads and box body flanges and a reactor assembly system is formed. The assembly system is suitable for treatment of various gases with peculiar smell, high-humidity?gases and smoke zones in different quantitative grades. The product is advantaged by safety, energy saving and environmental protection, the flexibility of the system layout is strong, the adaptive condition range is wide and the service life is long.

The invention discloses a three-valued inverter based on CNFETs. The three-valued inverter comprises a first CNFET, a second CNFET, a third CNFET, a fourth CNFET, a fifth CNFET, and a sixth CNFET. 0.9V voltage is inputted into the source electrode of the second CNFET, the base electrode of the second CNFET, the base electrode of the third CNFET, and the base electrode of the sixth CNFET. The drain electrode of the third CNFET, the drain electrode of the fourth CNFET, the drain electrode of the fifth CNFET, and the drain electrode of the sixth CNFET are connected. 0.45V voltage is inputted into the source electrode of fourth CNFET and the source electrode of the fifth CNFET. -0.9V voltage is inputted into the base electrode of the fourth CNFET and the base electrode of the fifth CNFET. The grid electrode of the first CNFET, the grid electrode of the second CNFET, the grid electrode of the third CNFET, the grid electrode of the fourth CNFET, the grid electrode of the fifth CNFET, and the grid electrode of the sixth CNFET are connected and a connection point of the same is a signal input end. The drain electrode of the first CNFET, the drain electrode of the second CNFET, the drain electrode of the third CNFET, and the drain electrode of the sixth CNFET are connected and a connection point of the same is a signal output end. The three-valued inverter based on CNFETs has an advantage of low power consumption and satisfies intermediate level needed by users.

A DC-DC converter is driven by single high input voltage, and includes a voltage converter circuit and a control circuit. The increase of the occupied area of the DC-DC converter is suppressed. The DC-DC converter includes an input terminal to which input voltage is applied; a voltage converter circuit connected to the input terminal, and including a first transistor; a control circuit configured to control the voltage converter circuit, and including a second transistor including a silicon material in a channel formation region; and a third transistor provided between the input terminal and the control circuit, and configured to convert the input voltage into power supply voltage that is lower than the input voltage. The first transistor and the third transistor include an oxide semiconductor material in channel formation regions. The first transistor and the third transistor are stacked over the second transistor with an insulating film provided therebetween.

A method for improving the modulation index using an intelligent battery pack, in which method a battery pack includes a plurality of freely interconnectable energy modules. An energy module has at least one energy cell and at least two switches, and in which method series or parallel interconnection of a respective energy module with at least one adjacent energy module of the battery pack is implemented by a controller. A terminal voltage of the battery pack, which terminal voltage results from the respective interconnection, is adjusted in accordance with a respectively prespecified load demand on at least one N-phase electrical machine. The terminal voltage is connected as an input voltage to at least one multi-stage inverter, and an N-phase alternating current for supplying a respective N-phase electrical machine is formed by the at least one multi-stage inverter on the basis of a level of the input voltage.

The invention discloses a DC traction power supply device comprising a voltage reduction module, an AC / DC conversion module, a voltage distribution module and a DC / DC voltage conversion module which are connected in sequence, wherein the voltage reduction module is connected into a three-phase power supply through a high-voltage circuit breaker for three-phase voltage reduction; the AC / DC conversion module converts AC into DC and carries out power transmission; the voltage distribution module comprises a plurality of voltage distribution units connected in series and carries out series voltage distribution on the DC; the DC / DC voltage conversion module comprises a plurality of DC / DC voltage conversion units connected in parallel; each DC / DC voltage conversion unit is connected to one voltage distribution unit in parallel and carries out DC voltage conversion on distributed voltage output by the voltage distribution unit, and the converted voltage is output to a DC traction power supply system in parallel. The DC traction power supply device is wide in application range and small in work amount, saves cost, achieves DC power supply of the traction system under the condition of not changing an AC traction power supply network structure, and has the advantage of solving the application problems of high input voltage and large output current.

The invention provides a belt-starter generator (BSG) motor control system for a micro hybrid vehicle, which comprises positive and negative buses which are led out from the two poles of a power supply, a three-phase inversion / rectification circuit connected between the positive and negative buses, a BSG motor stator three-phase winding connected with the three-phase inversion / rectification circuit, and a buck chopper circuit and a BSG motor rotor exciting winding which are connected between the positive and negative buses in series, wherein a booster circuit is arranged between the power supply and the buck chopper circuit; the input end of the booster circuit is connected with the power supply, and the output end of the booster circuit is connected with the input end of the buck chopper circuit; and the three-phase inversion / rectification circuit, the buck chopper circuit and the booster circuit are connected with a control circuit of a start and stop system of a motor and are controlled by the control circuit. The system improves the quick loading capacity of the BSG motor by increasing the control voltage of the excitation of the BSG motor.

A system and method for operating a high dynamic range analog front-end receiver for long range LIDAR with a transimpedance amplifier (TIA) include a clipping circuit to prevent saturation of the TIA. The output of the clipping circuit is connected via a diode or transistor to the input of the TIA and regulated such that the input voltage of the TIA remains close to or is only slightly above the saturation threshold voltage of the TIA. The regulation of the input voltage of the TIA can be improved by connecting a limiting resistor in series with the diode or transistor. A second clipping circuit capable of dissipating higher input currents and thus higher voltages may be connected in parallel with the first clipping circuit. A resistive element may be placed between the first and second clipping circuits to further limit the input current to the TIA.

The invention discloses a double-boosting high-voltage pulse power supply. The double-boosting high-voltage pulse power supply comprises a main circuit and a control circuit. In the main circuit, a 220V alternate current power source is sequentially connected with a rectifier circuit, a filter circuit, a Boost circuit, an inverter circuit, a pulse transformer, and a pulse rectifier circuit; and the pulse rectifier circuit outputs a high-voltage pulse finally. In the control circuit, a DSP (digital signal processor) system generates three paths of PWM (pulse width modulation) signals which are connected with three drive circuits through respective PWM amplification circuits; one path PWM signals is used for controlling an IGBT (insulated gate bipolar transistor) in the Boost circuit; and the other two paths of PWM signals are used for controlling an IGBT in the inverter circuit. Both the Boost circuit and the inverter circuit are provided with an IGBT protection circuit; the IGBT protection circuits can input fault signals to a DSP when the IGBTs have a fault; and the DSP can interrupt transmission of the PWM signals immediately, so that the IGBTs are kept in an off state, thereby protecting the overall system.

An apparatus for driving LEDs using high voltage includes a plurality of LEDs divided into a plurality of LED segments connected in series and a plurality of three-terminal voltage controlled current limiting devices. Each of the current limiting devices is associated with one of the LED segments and has a first terminal connected to a negative end of the associated LED segment, a second terminal applied with a bias voltage and a third terminal connected to a common node. A current source is connected between the common node and ground. A power-loss reduction circuit having a plurality of LEDs controlled by an LED controlling circuit may further be inserted between the common node and the current source to reduce the power loss in the current source because of the high voltage at the common node.

The invention discloses a three-level soft switch forward-flyback DC / DC converter circuit topology structure, comprising a single-phase three-level half-bridge inversion circuit, a soft switch auxiliary circuit, a coupling transformer, an uncontrolled full wave rectifying circuit, a filtering circuit and a load resistor. The three-level technology is utilized to reduce voltage stress of a switch tube; the soft switch auxiliary circuit is utilized to make an advanced tube and a lagging tube decoupled in a working process of the circuit, and enables the lagging tube to have enough energy to realize zero voltage switching when the lagging tube is under a light load; magnetic integration technology is utilized to integrate two transformers on a magnetic core, wherein the two transformers alternatively work in a forward state and a flaback state; a DC filtering circuit can be constituted by filtering capacitors without filtering resistors by utilizing the fact that a flyback transformer is capable of filtering inductance;. As a result, the topology structure has advantages of being applicable to a high voltage input occasion, realizing the soft switch in a relatively wide load range, and high power density.

This invention discloses electrostatic discharge prevention circuit of power chip. It is run according to the indication of the electrostatic discharge detect circuit. When the detecting circuit output enable signal to the prevention circuit, the prevention circuit provides short circuit path for electrostatic discharging in order to protect inner circuit of the chip from unexpectant damaging by static electricity of high voltage or high current.

The invention discloses a power supply circuit of a battery. The power supply circuit comprises a main power circuit unit, a constant-current feedback circuit unit, a constant-voltage feedback circuitunit and a control circuit unit, wherein the main power circuit unit comprises an energy storage component and is used for controlling a constant-current power supply to charge the energy storage component and a battery or charging the battery by the energy storage component according to a control signal output from the control circuit, and the control circuit unit is used for outputting the control signal to the main power circuit unit according to a current comparison result and a voltage comparison result. Compared with the prior art, the power supply circuit of the battery has the advantages that the constant-current charging function of the circuit is started and an input voltage is enabled not to be pulled down by the battery when difference between an output voltage of an AC / DC power supply and a battery voltage is excessively large and a charging current of the battery exceeds a set value.

The invention suppresses the degradation of an input power factor or drive efficiency which is caused by the distortion of a current waveform flowing to a single-phase AC power source under the effect of a regenerative current from a motor 2 or a charging current to internal parasitic capacitance, related to a motor driver 101b of inverter driving that comprises no large capacitance capacitor.The motor driver comprises a single-phase rectification circuit 3 connected to a single-phase AC power source 1, an inverter circuit 4 which is connected to the single-phase rectification circuit 3 and applies a current and a voltage to a motor 2, and an inverter control unit 5b that controls the inverter circuit 4. The inverter control unit 5b controls the current supplied to a motor 2 which is the output of the inverter circuit 4, so that an inverter input voltage Vpn comes to be equal to an absolute value 3 / 4 v 3 / 4 of the voltage of the single-phase AC power source 1.