1553results about "Ac-dc conversion without reversal" patented technology

The invention discloses an isolation type split-phase inverter circuit and a control method thereof. The isolation type split-phase inverter circuit comprises an isolation DC / DC module circuit and a power frequency rectification module circuit. The isolation DC / DC module circuit comprises an input-side full bridge, a three-end transformer and two output-side circuits, an input-side winding of the three-end transformer is connected with a midpoint of a bridge arm of the input-side full bridge, and the input-side full bridge is connected with a filter capacitor C1 in parallel; two output side windings of the three-end transformer are respectively connected with corresponding output circuits through a resonance network circuit, the two output circuits are connected to a power frequency rectification module circuit through filter capacitors C4 and C5, and the negative electrode of the first output circuit and the positive electrode of the second output circuit are connected to form an interface N; the power frequency rectification module circuit comprises a rectification full-bridge circuit, and an interface L1 and an interface L2 are obtained after rectification. Through cooperative control of direct transmission of integrated topology and voltage signals, a complex parameter matching algorithm is not needed, breakthrough in structure simplification, energy conversion efficiency, control convenience, cost control and safety is achieved, and the method is suitable for various power conversion scenes.

The invention provides a PWM / Buck cascade circuit auxiliary electrolytic hydrogen production rectification power supply and a control method, and relates to the technical field of electrolytic hydrogen production power supply and intelligent power grids, and the power supply comprises a main power loop and an auxiliary power loop; the main power loop comprises a multi-pulse thyristor rectifier, the power supply side of the multi-pulse thyristor rectifier is connected with an alternating-current power grid, the load side of the multi-pulse thyristor rectifier is connected with one end of a direct-current smoothing reactor, and the other end of the direct-current smoothing reactor is connected with the electrolytic bath; the auxiliary power loop comprises a PWM rectifier and a Buck circuit which are connected in series, the output end of the Buck circuit is connected to the output end of the main power loop in parallel through a direct-current LC filter, the output end of the Buck circuit and the output end of the main power loop are jointly connected into an electrolytic bath for ripple compensation, the multi-pulse rectifier adopts PI control, the PWM rectifier adopts voltage and current double-closed-loop control and SVPWM modulation, Buck adopts PI and feedforward compound control, and the output end of the Buck circuit and the output end of the main power loop are connected in parallel. The system has the advantages of improving the grid-side electric energy quality, the voltage utilization rate, the water electrolysis hydrogen production efficiency and the operation stability.

The embodiment of the invention provides a current sharing control method and an AC-DC conversion system, the current sharing control method is applied to a current sharing controller, the current sharing controller is used for controlling the working state of an AC-DC converter, the AC-DC converter comprises at least two rectification units, and the at least two rectification units adopt a combination of a bridge topology structure and an LLC resonant tank; comprising the steps of determining a target adjustment phase according to absolute values of three-phase input voltage instantaneous values of at least two rectification units; according to the current sampling values of the at least two rectification units, a target duty ratio of a target adjustment phase in each rectification unit is determined, and the target duty ratio is used for indicating adjustment of the voltage gain of the LLC resonant tank; and adjusting the duty ratio of the control signal of the switching tube in each rectification unit according to the target duty ratio of the target adjustment phase in each rectification unit. According to the embodiment of the invention, the gain of the LLC is changed by adjusting the pulse width of the switching tube control signal in the rectification unit and adjusting the amplitude distribution of the input voltage of the resonant tank, so that the output current of the LLC is controlled, and the purpose of current sharing is achieved.

A three-phase wireless electric energy transmission device disclosed by the present invention comprises a three-phase inverter, a three-phase switch capacitor, a coil magnetic field coupling structure and a rectifier, the coil magnetic field coupling structure comprises a primary coil and a secondary coil which are arranged in mirror symmetry, the primary coil is provided with two layers, each layer comprises a three-phase coil, each phase coil occupies a 120-degree angle range of the circumference, and the rectifier is connected with the primary coil and the secondary coil. The two layers of coils form a staggered angle, each phase of switched capacitor of the three-phase switched capacitor comprises a first capacitor branch and a second capacitor branch which are arranged in parallel, the first capacitor branch is provided with a first capacitor, and the second capacitor branch comprises a second capacitor and a switch module which are arranged in series; the switch module adjusts the equivalent capacitance value of the second capacitor branch through the duty ratio and adjusts the transmission power of the three-phase wireless power transmission device. The invention further discloses a load power adjusting method of the three-phase wireless power transmission device, the transmission efficiency can be kept unchanged within the adjusting range, and soft switching can be achieved within the adjusting range.

The invention relates to the technical field of vehicle-mounted power supply control, in particular to a multiplexing bridge arm control method and a multiplexing bridge arm system, which are oriented to an integrated topology for multiplexing an OBC circuit and a DCDC circuit, take bridge arms H7 and H8 as fixed phase references, and collect a DCDC circuit running state identifier, an OBC circuit starting signal and an alternating current input voltage sampling value; aligning the starting time corresponding to the starting signal to the next alternating current input voltage zero crossing point time as the starting time of the OBC circuit under the operation state of the DCDC circuit; switching the output power upper limit of the DCDC circuit from a first power upper limit to a second power upper limit before the start-up moment is reached; and switching the switching frequency of the DCDC circuit from the first switching frequency to the second switching frequency after the start-up moment is reached, and executing in-bridge phase shift control and inter-bridge phase shift control of the secondary side. According to the method, the number of power devices and drivers is reduced, input current impact and power factor fluctuation are suppressed, and electromagnetic compatibility pressure is reduced.

This application provides a power module and a charging device. The power module includes N groups of interleaved parallel PFC circuits and a controller. Each group of the interleaved parallel PFC circuits includes a PFC inductor, an autotransformer, a first rectifier bridge arm, and a second rectifier bridge arm. The autotransformer includes a first winding and a second winding that are coupled to each other. One end of the PFC inductor is configured to receive an alternating current, and the other end of the PFC inductor is configured to connect to one end of the first winding and one end of the second winding. The other end of the first winding is configured to connect to the first rectifier bridge arm, and the other end of the second winding is configured to connect to the second rectifier bridge arm. The controller is configured to: in response to that an absolute value of a difference between a current of the first winding and a current of the second winding is greater than or equal to a preset value, adjust a duty cycle of a drive signal of a switching transistor of the first rectifier bridge arm or the second rectifier bridge arm in a next switching cycle.

The invention provides a current sharing control method and an AC-DC conversion system. The method comprises the steps that the method is applied to a current sharing controller, the current sharing controller is used for controlling the working state of an AC-DC converter, the AC-DC converter comprises at least two rectification units, and the at least two rectification units adopt the combination of a bridge topology structure and an LLC resonant tank; the method comprises the following steps: acquiring current sampling values of at least two rectification units; according to the current sampling values of the at least two rectification units, a target phase shift angle of each rectification unit is determined, and the target phase shift angle is used for indicating the duration when the input voltage of the LLC resonant tank is in a 0-level state; and according to the target phase shift angle of each rectification unit, controlling a control signal of a target switch tube in the bridge topology structure of each rectification unit to perform phase shift. According to the embodiment of the invention, the input voltage of the LLC resonant tank is 0 level by adjusting the phase shift angle of the switching tube in the rectification unit, so that the output current of each rectification unit is controlled, and the effect of current sharing of the outputs of the plurality of rectification units is achieved.

The invention discloses a circuit for a high-voltage direct-hanging electric heater, and the circuit comprises a high-voltage pre-charging module which is used for inputting high-voltage alternating current and suppressing the surge current of the high-voltage alternating current; the full-bridge rectifier module is used for converting the high-voltage alternating current into direct current; the conversion and control module is used for isolating and converting the direct current and outputting rated voltage and required power of the electric heater based on the direct current, the full-bridge rectifier module is connected with the high-voltage pre-charging module and the conversion and control module, and the output end of the conversion and control module is connected with the electric heater.

The invention relates to the technical field of switching power supplies, and discloses a gallium nitride charger based on a 494 PWM chip, which comprises a power panel, a rectification circuit module, a half-bridge gallium nitride driving module, a transformer, a 494 chip control module, a totem pole driving module, an isolation driving transformer, a full-wave rectification module, a filter circuit module and a conversion circuit module, the core is that the 494 chip control module generates a PWM signal, and the PWM signal sequentially passes through the totem pole driving module for current amplification and the isolation driving transformer for electrical isolation and signal coupling to drive the two gallium nitride transistors in the half-bridge topology for high-frequency alternate switching. According to the invention, the high-speed switching characteristic of the gallium nitride device is fully exerted, and the charger can work at a higher frequency, thereby reducing the switching loss, reducing the size of a magnetic element, and achieving the high power density and high overall conversion efficiency while improving the power level to a kilowatt level.

This antenna device is provided with a rectifier circuit which receives radio waves in space and the electric field energy of a quasi-electrostatic field and rectifies an AC signal to DC, and comprises an antenna unit which is configured from a first antenna element which is used in contact with a human body in a state in which the human body is not grounded to a ground that is the earth, and a second antenna element which is a separate conductor from the first antenna element and which is provided so as not to contact the human body. An input line for outputting to the rectifier circuit the part of the AC signal outputted from the antenna unit that is from the first antenna element used in contact with the human body, is connected in series with the rectifier circuit. FIG. 2

The invention discloses a multifunctional buck-boost control circuit of a rectifier, which relates to the technical field of rectification control, and comprises a micro-control module for controlling a rectification processing module to carry out rectification processing, carrying out high-frequency adjustment by controlling a switch tube and controlling an upper half capacitor and a lower half capacitor to carry out alternate double-path energy storage and series power supply, in addition, boost power supply and buck power supply for the first interface module can be realized by changing a transmission path of the first interface module, and during buck power supply for the first interface module, the energy storage module can be controlled to store the electric energy released by the lower half capacitor or the second interface module can be controlled to receive the electric energy released by the lower half capacitor. When further boost power supply is needed, the energy storage module and the rectification processing module can be controlled to carry out series boost power supply processing when the energy storage module is fully charged. The multifunctional buck-boost control circuit of the rectifier can realize voltage balance control, avoids voltage jump, improves the utilization rate of electric energy, can perform multi-path power supply, and increases the width of output voltage.

A battery charging system for an electric vehicle including a dual use direct current to direct current converter including a direct current to alternating current converter and a transformer for generating a rotor winding current in response to a first direct current in a propulsion mode and for generating a charging current in response to a charging mode.

The application discloses a power supply circuit and an uninterruptible power supply, which comprises a commercial power access branch, a battery access branch and a rectifier unit; the battery access branch comprises a battery relay and a thyristor; the first end of the battery relay is connected with a battery power supply, and the second end thereof is connected with the input end of the rectifier unit; the first end of the thyristor is connected with the first end of the battery relay, and the second end thereof is connected with the second end of the battery relay; the commercial power access branch comprises a commercial power relay and a first capacitor; the first end of the commercial power relay is connected with a commercial power supply, and the second end thereof is connected with the second end of the battery relay; the first end of the first capacitor is connected with the first end of the commercial power relay, and the second end thereof is connected with the second end of the commercial power relay; when the commercial power relay is attracted, the first capacitor maintains the voltage continuity between the two ends of the commercial power relay, so as to inhibit the voltage change rate between the two ends of the thyristor. When the battery is switched to the commercial power, the voltage change rate between the two ends of the thyristor is inhibited by the first capacitor, so that the thyristor is prevented from being mis-conducted.

The present application relates to the field of electrical engineering, in particular to a kind of full DC power supply system suitable for pulse load characteristics.The system includes control unit, chassis engine, generator, rectifier unit, energy storage unit and distribution unit;Wherein, rectifier unit uses uncontrolled rectification+BUCK type step-down topology, and constant voltage control strategy, specifically: double-loop control mode of outer ring voltage control+inner ring current control, output DC 600V DC bus is stabilized at set voltage value, realizes the constant voltage control of output voltage.Solve the energy supply problem of equipment single vehicle operation, and the problem that traditional electric car system constant current strategy and equipment pulse load are difficult to match.Using the power supply structure of rectifier unit+energy storage unit (capacitor), remove lithium battery in traditional electric drive system, avoid the safety problem of lithium battery, and the system safety is high.

The utility model relates to the technical field of nuclear fusion, and discloses a power supply circuit for an electrostatic probe, which comprises a power supply module and a sampling module, the power supply module is connected with the electrostatic probe through the sampling module, the power supply module comprises a plurality of linear power supply branches which are input in parallel and output in series, each linear power supply branch comprises a linear voltage regulator and a voltage regulating unit, and the input end of each linear voltage regulator is connected with a corresponding external power supply; the output end of the linear voltage regulator is connected with the electrostatic probe through the voltage regulating unit, and the voltage regulating unit corresponding to the last stage of linear voltage regulator is connected between the output end of the current linear voltage regulator and the ground. And the voltage regulating unit corresponding to the previous-stage linear voltage regulator is connected between the output end of the current linear voltage regulator and the output end of the next-stage linear voltage regulator. The power supply voltage with small enough voltage ripple and high enough voltage value can be provided for the plasma acquisition device, and weak ion saturation current signals can be accurately detected.

The utility model relates to the technical field of electronic circuits, in particular to a magnetic clamp control circuit and imaging detection aperture equipment, the magnetic clamp control circuit comprises a power supply circuit unit, a control circuit unit and a load circuit unit, the power supply circuit unit comprises a first switch, a switching power supply and a DC-DC voltage reduction module, the control circuit unit comprises an adjustable potentiometer and a knob switch, and the load circuit unit comprises a magnetic coil. According to the magnetic clamp control circuit of the utility model, through reasonable power supply conversion, voltage regulation and control design, the reliability and economical efficiency of imaging detection aperture equipment are effectively improved.

The application provides a high-power low-voltage starting rectifying device, which comprises a three-phase input power distribution and filter unit, a three-phase 12-pulse rectifying unit, a DC / DC unit I, a DC / DC unit II and a control module; the three-phase input power distribution and filter unit is connected with the three-phase 12-pulse rectifying unit, the three-phase 12-pulse rectifying unit adopts a differential connection triangle autotransformer 12-pulse rectifying technology and is connected with the DC / DC unit I and the DC / DC unit II respectively; the DC / DC unit I adopts a three-channel staggered parallel phase-shift full-bridge technology, and the DC / DC unit II adopts a single-channel phase-shift full-bridge technology; the control module is connected with the DC / DC unit I and the DC / DC unit II respectively; the control module is used for controlling the DC / DC unit I and the DC / DC unit II to convert direct current voltage and supply a hovercraft gas turbine. The hovercraft gas turbine can be started.

This invention discloses a positive ignition power supply for a laser gyroscope, comprising a BOOST power module, a primary voltage multiplier module, a multi-stage voltage multiplier module, and a feedback circuit. Each stage of the multi-stage voltage multiplier module includes a first voltage multiplier diode D01, a second voltage multiplier diode D02, and a first voltage multiplier capacitor C01. The primary voltage multiplier module includes a primary voltage multiplier diode and a primary voltage multiplier capacitor. The cathode of the primary voltage multiplier diode and one end of the primary voltage multiplier capacitor are both connected to the first connection terminal of the first-stage voltage multiplier unit, and the other end of the primary voltage multiplier capacitor is connected to ground (GND). The anode of the primary voltage multiplier diode is connected to the output terminal of the BOOST power module. The second connection terminal of the last stage voltage multiplier unit forms the output terminal of the voltage multiplier circuit. This invention can reduce the impact of temperature drift caused by circuit efficiency, ripple voltage output, and the voltage withstand requirements of components.

This invention provides a switching power supply, an AC-DC circuit, an input voltage detection circuit, and a method. The first end of the secondary coil of a transformer is connected to the anode of a rectifier diode, and the cathode of the rectifier diode is connected to the positive terminal of a filter capacitor. The second end of the secondary coil of the transformer, the negative terminal of the filter capacitor, and the positive terminal of the sampling capacitor are all grounded. The cathode of the diode is connected to the first end of the secondary coil of the transformer, and the anode is connected to the negative terminal of the sampling capacitor. The negative terminal of the sampling capacitor is grounded sequentially through a third sampling resistor and a second sampling resistor. The common terminal of the third and second sampling resistors is connected to a voltage detection terminal and, through a first sampling resistor, to a reference voltage input terminal. A reference voltage is input to the reference voltage input terminal. The control unit detects the voltage at the voltage detection terminal and calculates the magnitude of the input AC voltage based on the relationship between the AC voltage and the voltage at the voltage detection terminal.

The invention provides a power supply system. The power supply system comprises a direct current bus, an AC-DC conversion circuit, a load circuit, an energy storage unit and a partial power conversion circuit, the AC-DC conversion circuit converts an AC voltage into a DC bus voltage. When the energy storage unit discharges to the direct current bus, the partial power conversion circuit directly transmits a first part of the electric energy provided by the energy storage unit to the direct current bus, converts a second part of the electric energy provided by the energy storage unit and transmits the converted second part to the direct current bus. When the energy storage unit is charged by the direct-current bus, the partial power conversion circuit directly transmits a first part of electric energy provided by the direct-current bus to the energy storage unit, converts a second part of the electric energy provided by the direct-current bus and transmits the converted second part to the energy storage unit. Therefore, the voltage of the direct-current bus is kept stable.

The utility model discloses a low-ripple rectification voltage doubling circuit, which relates to the field of voltage doubling rectification and comprises a first-stage voltage doubling module, a second-stage voltage doubling module, a third-stage voltage doubling module and a fourth-stage voltage doubling module, the second-stage voltage multiplying module is used for carrying out voltage multiplying on the input negative half-cycle voltage; the transformer is used for connecting outputs of the first-stage voltage-multiplying module and the second-stage voltage-multiplying module in parallel and converting an output result into high-voltage electricity; the bridge rectifier module is used for rectifying the high-voltage electricity and outputting direct-current voltage; one end of the primary voltage-multiplying module is respectively connected with one end of the secondary voltage-multiplying module, one end of the transformer and one end of the bridge rectifier module, and the other end of the secondary voltage-multiplying module is connected with the other end of the bridge rectifier module and the other end of the transformer. The two groups of half-wave voltage doubling circuits provided by the utility model are applied on the circuit in a staggered manner, the circuit structure is simple, the cost is low, the economic benefit is high, two groups of pulse voltages with complementary phases are output, and the output voltage ripples are greatly reduced.

The utility model discloses a direct current power supply circuit and a lamp, and relates to the technical field of circuits and lamps, the direct current power supply circuit comprises a combined type electrolytic capacitor which is connected in parallel in a direct current circuit obtained by rectification of a rectification circuit, the combined type electrolytic capacitor is formed by connecting two electrolytic capacitors in series, one electrolytic capacitor is a large-capacitance low-voltage electrolytic capacitor, the other electrolytic capacitor is a small-capacitance high-voltage electrolytic capacitor, and the negative electrode of the large-capacitance low-voltage electrolytic capacitor is connected with the positive electrode of the small-capacitance high-voltage electrolytic capacitor. The two electrolytic capacitors are small in size, small in size after being combined, and small in occupied space.

The utility model relates to a kind of 24-pulse self-coupling modulation and in-phase inverse parallel rectifier transformer topology, comprising: two rectifier transformers, including two bodies respectively, each body includes a set of high-voltage winding and a set of low-voltage winding, high-voltage winding adopts star connection, low-voltage winding adopts delta connection, and low-voltage winding is connected to rectifier output loop in in-phase inverse parallel mode;A self-coupling voltage regulating device, the primary side is connected to AC power grid, the secondary side outputs multiple voltage, and supplies the high-voltage side input of rectifier transformer respectively;Rectifier transformer high-voltage winding is provided with different phase shift angle respectively, to form the phase difference combination of preset angle, realize equivalent twenty-four pulse wave output;Self-coupling voltage regulating device is constant magnetic flux junction;Rectifier transformer adopts variable magnetic flux mode voltage regulation;Two rectifier transformers have independent circuit and magnetic circuit structure respectively.

The invention discloses a self-voltage-sharing bipolar phase-shifted full-bridge converter based on a coupling inductor, which comprises a full-bridge circuit, a high-frequency transformer Tr, a leakage inductor Lk, a blocking capacitor Cb, a full-bridge rectifying circuit, filter inductors Lf1 and Lf2 and a bipolar output circuit, a leakage inductor and a blocking capacitor are connected in series and then connected to the primary side of the high-frequency transformer; the high-frequency transformer comprises a primary winding and a secondary winding with a center tap, and the secondary winding is connected with the full-bridge rectifier circuit; the invention further provides a control method of the bipolar phase-shifted full-bridge converter. The novel bipolar port self-voltage-equalizing method based on the coupling inductor is adopted, output port voltage balance under any load condition is achieved without adding any additional device and voltage-equalizing control, and the method has the advantages of being low in cost, easy to control and wide in adjusting range.

An AC-DC switch mode electrical power converter is proposed. Comprises an input half- bridge comprising an input capacitive leg and an input switching leg; an output half-bridge comprising an output capacitive leg and an output switching leg; and a transformer. A secondary winding of the transformer is connected between a middle point of the output capacitive leg and a middle point of the output switching leg, while a primary winding is connected in series to an AC input voltage source. An input current and an output voltage are controlled based on control variables including a duty cycle of the input half-bridge, a duty cycle of the output half-bridge, and a phase shift between the duty cycle of the input half- bridge and the duty cycle of the output half-bridge. In some embodiments, the input capacitive leg, input switching leg, output capacitive leg and / or output switching leg can be replaced by a switched capacitor leg.

The objective is to reduce carrier ripple current and to reduce the outflow of carrier ripple current to the power supply. [Solution] The power converter 50 includes a rectifier circuit 2 that converts the three-phase AC input voltage (phase-to-phase voltage Vac) input from AC input terminals 55r, 55s, and 55t into a DC voltage; a converter 31 that outputs an output voltage Vo set to a set voltage value from the DC voltage output from the rectifier circuit 2; a smoothing capacitor 6 connected between the positive converter output terminal (DC output terminal 64p) and the negative converter output terminal (DC output terminal 64n) of the converter 31 that outputs the output voltage Vo; an LC filter 30 having a filter reactor 8 and a filter capacitor 9 arranged between the AC input terminals 55r, 55s, and 55t and the converter 31; and a controller 10 that controls the converter 31.

The invention relates to a power supply device (1) for an electrolyzer (10), wherein the power supply device (1) comprises an input circuit (2) and a power converter (3), the input circuit (2) being configured to be connected to a power source (4) or a power supply network. To improve the power supply device (1), it is proposed that the input circuit (2) be further configured to provide at least two different electrical potentials at contacts (5), the power converter (3) being electrically connected on the input side to at least one of the contacts (5) by means of a respective conductor (6), and the power supply device (1) being configured such that a change in the contact (5) connected to the power converter (3) is effected by reconnecting at least one conductor (6) of the power supply device (1).Furthermore, the invention relates to an electrolysis device comprising such a power supply device (1) and an electrolyzer (10). The invention further relates to a method for controlling such a power supply device (1) or such an electrolysis device (100), wherein the power converter (3) is operated with one of the voltage levels generated by the input circuit, wherein, to change the voltage level, at least one conductor (6) of the power supply device (1) is manually switched from a first contact of the contacts (5) to a second contact of the contacts (5).

The objective is to provide a switching power supply equipped with an AC / DC converter having an AC filter circuit and a PFC circuit, which prevents a decrease in power factor even under light load conditions. [Solution] The problem is solved by a switching power supply device comprising an AC / DC converter having a PFC circuit and a pulse signal generation unit that generates pulse signals for driving the switch elements of the PFC circuit so that the voltage of the AC / DC converter becomes a predetermined target value, wherein the AC / DC converter further comprises an AC filter and a current sensor that monitors the current of the AC power supply in order to generate the drive pulse signals for the switch elements, and the current sensor is disposed on the AC power supply side of the AC filter.

The purpose of the present invention is to achieve high efficiency and high efficiency. In the present invention, a converter device (1) comprises a rectifier (2), a half bridge inverter (3), an input inductor (Lin), a transformer (Tr1), a full bridge inverter (4), an inductor (L1), and a control device (5). The transformer (Tr1) has a primary winding (N1) connected between a first output end (34) and a second output end (35) in the half bridge inverter (3). The full bridge inverter (4) is connected to a secondary winding (N2) of the transformer (Tr1). The inductor (L1) is connected between the half bridge inverter (3) and the primary winding (N1) or between the secondary winding (N2) and the full bridge inverter (4). The control device (5) controls the half bridge inverter (3) and the full bridge inverter (4).