77 results about "Resonant capacitor" patented technology

The present disclosure relates to a kind of direct current transformer, direct current transformer includes: transformer circuit, inverter circuit, rectifier circuit and resonance circuit;The direct current side of inverter circuit is connected with direct current input port, the alternating current side of inverter circuit is connected with the primary side of transformer circuit;The alternating current side of rectifier circuit is connected with the secondary side of transformer circuit, the direct current side of rectifier circuit is connected with direct current output port;Resonance circuit includes multiple resonance modules, the alternating current side of inverter circuit is connected with the alternating current side of rectifier circuit through multiple resonance modules and transformer circuit;Resonance module includes first capacitor, resonance module is used to control the input or cut-out of first capacitor.The present disclosure can simulate the voltage outputted when direct current transformer adopts different capacitance resonant capacitor, so as to ensure that direct current transformer does not need to set resonant capacitor, can satisfy the realization condition of resonant soft switching in different working condition scene, and then make the switching device in inverter circuit and rectifier circuit can realize soft switching.

This application provides a wireless power transfer system with dual voltage level output and its switching method to solve the problem that existing WPT systems cannot meet the charging needs of different voltage levels. It includes a transmitting unit and a receiving unit. The transmitting unit includes a DC power supply, a high-frequency inverter, and a transmitting coil circuit connected in sequence. The transmitting coil circuit is connected in sequence to a first transmitting coil, a first primary-side resonant capacitor, a control switch, a second primary-side resonant capacitor, and a second transmitting coil. The other ends of both the first and second transmitting coils are connected to the output terminal of the high-frequency inverter. A switching circuit is also provided between the first and second transmitting coils to cooperate with the control switch to enable the system to switch between dual voltage levels. This application achieves the switching between different voltage levels through the control of the control switch and the switching circuit, thus meeting the charging needs of different voltage levels.

A bidirectional DC / DC converter according to an embodiment of the present invention comprises: a transformer; a primary-side circuit connected to one side of the transformer and including a full-bridge circuit composed of first to fourth switches, a first resonant inductor, a magnetizing inductor, and a first resonant capacitor; and a secondary-side circuit connected to the other side of the transformer and including a full-bridge circuit composed of fifth to eighth switches, a second resonant inductor, a second resonant capacitor, and a third capacitor. In a mode in which power is supplied from the secondary-side circuit to the primary-side circuit among operation modes of the bidirectional DC / DC converter, the sixth switch is set to OFF, the eighth switch is set to ON, and the fifth switch and the seventh switch may be turned ON / OFF according to a first switching frequency.

The utility model discloses an embodiment relates to a kind of push-pull resonant converter and the driving power supply of application this push-pull resonant converter, the push-pull resonant converter includes power supply, it includes power supply anode and power supply cathode;Main transformer, it includes primary winding and secondary winding, the primary winding of main transformer is connected to power supply anode and the source of first switch tube and the source of second switch tube, the secondary winding of main transformer is connected to resonant circuit;First switch tube and second switch tube, it is connected to the primary winding of main transformer, power supply cathode and controller;At least one secondary transformer, the secondary winding of each of the at least one secondary transformer is respectively connected to corresponding load;Resonant circuit, it includes first resonant capacitor and second resonant capacitor, resonant circuit is connected between the secondary winding of main transformer and the primary winding of each of at least one secondary transformer in series;And controller, it is used to control the conduction and turn-off of first switch tube and second switch tube.

DEPCT67 The power converter kit includes: A converter designed to transform AC power fed from a power source. AC power is converted into DC power using a pair of primarily conductive wires; An inverter, which is designed to convert the DC power sent from the converter to... A pair of wires with a second conductor is used to provide AC power; and A capacitor which is connected between the conductive wires of a pair of conductive wires or between... A wire with a conductive second conductor. Where the carrier wave frequency for driving the inverting motor is set to fc, the allowed frequency is... The resonance of an LC filter circuit consisting of one or more reactors and a... The capacitor is set to fLC, and the maximum value of the inverter's output frequency is set to MAX(f0)MAX(f0). It will then be according to MAX(f0)6 times.

This invention relates to a circuit board for an ozone generator with frequency tracking functionality. The circuit board includes a frequency tracking circuit comprising an RC oscillation unit, an LC resonant unit, a current sampling unit, a comparison control unit, a voltage divider bias unit, and a frequency limiting protection unit. The LC resonant unit includes a resonant inductor T1 and a resonant capacitor C1, used to drive the ozone sensor. The current sampling unit includes a sampling resistor R8 connected in series in the LC resonant circuit, used to acquire the circuit current signal. The comparison control unit includes a comparator U1, a transistor Q1, a rectifier diode D2, and a filter capacitor C3. The voltage signal from the sampling resistor R8 is rectified by D2 and filtered by C3 before being input to the inverting input of U1. The voltage divider bias unit includes resistors R3 and R6. The RC oscillation unit is connected to the transistor Q1. This invention can adapt to capacitance changes during ozone sensor power-on and operation, automatically tracking the frequency and achieving resonance, while ensuring stable output power, extending device lifespan, and improving ozone generation efficiency and overall reliability.

A power converter includes a transformer, a resonant circuit, a switch circuit, a resonant adjustment circuit, and a controller. The transformer includes a primary-side winding, a secondary-side winding, and a magnetizing inductance. The resonant circuit includes a first resonant capacitor, and the switch circuit includes a first switch and a second switch. The resonant adjustment circuit is coupled to the first resonant capacitor, and the controller is coupled to the resonant adjustment circuit. The controller controls the resonant adjustment circuit to adjust a resonant current flowing through the first resonant capacitor according to an output voltage of the power converter so as to adjust a current value that when the resonant current and a magnetizing current flowing through the magnetizing inductance intersect to be substantially equal to a predetermined value.

The application relates to a wireless power transmission frequency adaptive regulation method based on a PT symmetry condition, which comprises the following steps: determining the topological structure of a wireless power transmission system, the system comprising a transmitting end and a receiving end, the transmitting end comprising a transmitting coil and a series resonant capacitor, the receiving end comprising a receiving coil, a parallel resonant capacitor and a load, and the parallel resonant capacitor being connected in series with an external inductance; obtaining the coupling coefficient between the transmitting end and the receiving end; determining a critical coupling coefficient according to system parameters; judging whether the coupling coefficient is greater than the critical coupling coefficient, if yes, the PT symmetry condition is met, and energy transmission is carried out, if not, the external inductance is adjusted until the coupling coefficient is greater than the critical coupling coefficient, at this time, the PT symmetry condition is met, and energy transmission is carried out. The application can maintain the stability of power and efficiency when the coupling coefficient changes, and significantly improves the robustness of the system.

This invention discloses a double-layer mutually inducted coupled planar eddy current detection sensor. First, an external excitation source provides AC power input to the detection coil layer, causing the LC resonator, composed of the detection coil and a parallel resonant capacitor, to resonate, generating a sinusoidal current and forming a primary magnetic field. When the test piece is in the primary magnetic field, eddy currents are generated on its surface, creating a mutual inductance effect with the sensing coil. Changes in lift-off or disturbances in the flow direction of eddy currents at defects lead to changes in the mutual inductance coefficient, causing a change in the equivalent inductance of the sensing coil and a change in the resonant frequency. Finally, the resonant frequency is detected and extracted to obtain the detection signal. Similarly, a set of detection signals is also extracted from the reference coil. By comparing the changes in the signals detected by the reference coil and the detection coil, lift-off and defect signals are separated to obtain defect information.

A resonant capacitor Crk (k is a natural number of one to n) of each circuit element has one end connected in series to a resonant reactor Lr and a primary winding N1 of a transformer T, and another end connected to the resonant capacitor Crk of another circuit element 10 so that a dimensional multiphase LLC converter having a phase difference of 360° / Pk is constructed by Pk (Pk is an optional natural number) of the circuit elements 10.

This invention provides a cooking device and its control method, control apparatus, and readable storage medium. The control method for the cooking device includes: acquiring a first opening width and a second opening width, wherein the first opening width and the second opening width are the opening widths of a switching transistor when the cookware to be tested is placed in the cooking device and the cooking device is running at different power levels; acquiring a first pulse count, wherein the first pulse count is the number of repetitive waveforms generated by the coil and resonant capacitor oscillating when the switching transistor receives a trigger pulse; determining a first coefficient based on the first opening width, the second opening width, and the first pulse count; and determining the maximum heating power of the cookware to be tested based on the first coefficient, a preset coefficient, and the design power of the cooking device. The cooking device can match the corresponding maximum heating power to cookware of different materials, so that the cooking device controls heating according to the maximum heating power corresponding to the cookware, thereby improving the heating effect.

This application discloses a charging pile and its control method, relating to the field of DC charging technology. The charging pile includes a three-phase parallel resonant converter, a controller, and a relay control circuit. The three-phase parallel resonant converter is connected to both the controller and the relay control circuit. The three-phase parallel resonant converter includes three independent and structurally identical conversion units. Each conversion unit includes an input rectifier bridge, a resonant circuit, an isolation transformer, and a rectifier circuit connected in sequence. The resonant circuit includes a choke coil, a switching transistor, a shunt capacitor, a resonant capacitor, and a resonant coil. The rectifier circuit includes a rectifier capacitor, a diode, a filter capacitor, a first filter coil, and a second filter coil. The controller is used for: soft-start control of the output voltage and output current during the startup phase, and control of the series and parallel connection state of the relay control circuit; and for performing input-side and output-side regulation and drive wave generation control during the operation phase. This application has the advantages of high power density, small size, and simple control.

The application discloses a DAB circuit with a direct-current isolation capacitor or a resonant capacitor and a design method thereof, and can provide certain basis for the design of the size of the capacitor for the direct-current isolation or resonance in an alternating current loop. The application firstly defines an evaluation index of a direct-current isolation resonance degree, which is used for guiding the ratio design of a resonance period and a switching period. When guiding the design of the direct-current isolation capacitor, a larger direct-current isolation resonance degree is selected to ensure that the direct-current isolation capacitor has the least influence on the original characteristics of the circuit. When guiding the design of the resonant capacitor, a smaller direct-current isolation resonance degree is selected to reduce the switching loss. Secondly, according to the relationship among the maximum phase shift angle and 10% thereof, the ratio of the resonance period and the switching period, and the direct-current isolation resonance degree, the ratio size or the ratio reference range of the resonance period and the switching period is calculated, and finally the size of the required direct-current isolation capacitor or resonant capacitor is calculated.

The application provides a kind of multi-phase LLC-based direct current converter model prediction device and control method, specifically relates to direct current converter energy conversion technical field.The device includes two-stage converter cascade, input port has S, output port has N.The front stage is composed of S Buck circuits in parallel, each Buck circuit contains an inductor and two MOS tubes;The back stage is composed of N-phase LLC resonant converter, connected with the output port of the front stage Buck circuit.The front bridge of N-phase LLC resonant converter adopts half-bridge circuit, including two MOS tubes, resonant inductor, resonant capacitor and excitation inductor.The device adopts model prediction control method, the output voltage of next cycle is predicted to adjust relevant variables to maintain the purpose of output voltage.The application can access multiple voltage levels, model prediction control can be performed on direct current converter, voltage of specified voltage level can be output, voltage output can be effectively adjusted, and the demand of multi-scene application can be met.

A method for optimizing the design of a medium-frequency furnace based on the equivalent circuit principle includes: obtaining the structural parameters of the medium-frequency furnace; obtaining the inductor energy consumption parameters of the medium-frequency furnace: the equivalent resistance value R1 of the inductor energy consumption; obtaining the eddy current energy consumption parameters of the medium-frequency furnace: the equivalent resistance value R2 and the inductance value L of the eddy current energy consumption; and obtaining the physical parameters of the furnace charge: C1, C2, Q, and T. C Obtain heating process parameters: T and t; Calculate the average heating power P of the furnace charge. T The heat dissipation power ΔP of the medium frequency furnace T R1, R2, L, and the capacitance C of the resonant capacitor; calculate the evaluation parameters U, I, P, P1, P2, η, η based on the circuit calculation model. t η u The design parameters of the intermediate frequency furnace are optimized by adjusting the parameters to determine the optimal parameter combination. Through actual testing, this invention establishes a complete design calculation method for intermediate frequency furnaces, making the design results more consistent with actual usage and effectively solving technical problems such as frequency mismatch and power mismatch that may occur during the use of intermediate frequency furnaces.

This invention belongs to the field of power electrical technology and relates to a wide voltage range clamped boost LLC resonant converter, comprising: an input DC bus voltage unit, an active clamped boost unit, an inverter bridge unit, an LLC resonant tank unit, a transformer T, and a rectification and filtering unit; the active clamped boost unit includes a first feed inductor, a second feed inductor, a clamping capacitor, a third switch S3, and a fourth switch S4; the LLC resonant tank unit includes a resonant inductor and a resonant capacitor connected in series, and a magnetizing inductor of the transformer T; the rectification and filtering unit includes a first rectifier diode, a second rectifier diode, and a filter capacitor C. o Load R L This invention solves the technical problem in the prior art that traditional LLC converters have a limited gain adjustment range and cannot simultaneously meet high boost requirements.

The application is suitable for the technical field of resonant converter, and provides a start-up control circuit and a resonant converter. The start-up control circuit comprises a feedback module, a comparison and selection module and a logic operation module. The comparison and selection module is electrically connected with the feedback module and the logic operation module. The feedback module is used for being electrically connected with an output end of a resonant conversion circuit in the resonant converter. The logic operation module is used for being electrically connected with a driving circuit in the resonant converter. The start-up control circuit provided by the application can build a gradually expanded resonant capacitor voltage constraint threshold along the start-up process, realizes the smooth establishment of the resonant capacitor DC bias, limits the fluctuation amplitude of the resonant capacitor voltage, avoids the problem that the bus voltage full voltage is applied to the resonant inductor in the traditional scheme, and finally effectively suppresses the resonant current peak value in the start-up stage, reduces the impact of the current stress on the core devices such as the switch tube and the resonant inductor.

The application belongs to the technical field of converters and relates to a magnetic integrated converter for fixed switching frequency resonant conversion, which comprises a magnetic core and a PCB board, the magnetic core is a UI type magnetic core, and the PCB board is a multilayer board; a secondary winding layer is located between core columns of the magnetic core, a GND layer is sleeved outside the core columns of the magnetic core, and primary winding layer core column vias are respectively sleeved on the core columns of the magnetic core; the secondary winding layer is provided with an output capacitor and a synchronous rectification transistor, the primary winding layer is provided with an input capacitor, a primary transistor and a resonant capacitor; the secondary winding layer is electrically connected to the GND layer so that a secondary side of the transformer forms a loop; the primary winding layer is in series connection; and the magnetic integrated converter with higher integration degree can significantly reduce the area of the converter, thereby improving the power density of the converter.

The application concerns a multi-phase DC / DC-converter, comprising a primary side switching circuit comprising a plurality of primary side switching legs, where each primary side switching leg comprises two or more switch elements; at least one secondary side rectifier circuit each including a plurality of secondary side rectifier legs, where each secondary side rectifier leg includes two or more rectifier elements; a transformer, where the transformer includes a primary side connected to the primary side switching circuit and a secondary side connected to each of the at least one secondary side rectifier circuit; and at least one resonant capacitor network, each connected to the primary side or to the secondary side of the transformer, where each resonant capacitor network includes a plurality of capacitors.

The application provides an LLC converter and a wide-range voltage regulation method thereof. The LLC converter comprises an input voltage, an input inductor L in , a first half-bridge unit, a second half-bridge unit, a resonant cavity, a transformer, a rectifier circuit, an output capacitor and an output load. The first half-bridge unit is composed of a first switch S1, a second switch S2 and a bus capacitor C1, the second half-bridge unit is composed of a third switch S3, a fourth switch S4 and a bus capacitor C2, the resonant cavity is composed of a resonant capacitor C r , a resonant inductor L r and an excitation inductor L m , and the rectifier circuit is composed of a first rectifier diode D1, a second rectifier diode D2, a voltage doubler capacitor C3 and a voltage doubler capacitor C4. The application can realize soft switching of all power devices in a wide voltage gain range, the switching frequency is fixed at a series resonant frequency, which is beneficial to optimization and design of magnetic elements, and the capacitor voltage of the half-bridge unit in the LLC converter can be self-balanced.

The utility model provides a kind of LLC resonant converter, including transformer primary side and transformer secondary side, the transformer primary side includes fractional order resonant network, the fractional order resonant network is constituted by one resonant inductance, one fractional order resonant capacitor, one excitation inductance. The utility model replaces fractional order resonant capacitor in traditional LLC resonant converter integer order resonant capacitor, by setting the order of fractional order resonant capacitor, it can effectively inhibit and maintain zero voltage switch (ZVS) state to surge current impact in LLC resonant converter starting stage, improve system efficiency.

The present invention provides a power converter that includes multiple legs and corresponding auxiliary switches for each leg, and that can control the output voltage to be as intended. [Solution] The power conversion unit 1 of the power converter 11 comprises a plurality of legs 4, each having a series circuit of a high-potential side main switch S1 and a low-potential side main switch S2, resonant capacitors C1 and C2 connected in parallel to each main switch S1 and S2, and a series circuit of two auxiliary switches A1 and A2 and a resonant inductor L, one end of which is connected to the common connection point of the main switches S1 and S2 and the other end of which is connected to the common connection point. The control unit 13 controls each leg 4 to perform soft switching and corrects the timing of switching the auxiliary switches A1 and A2 so that the ON time ratio of the main switches S1 and S2 between each leg 4 is as intended.

An auxiliary resonant commutated pole (ARCP) device and an operating method of the ARCP device are provided. The ARCP device includes a first resonant capacitor, a second resonant capacitor, a resonant element, a first voltage switch, a second voltage switch, and a controller. The first resonant capacitor is connected between a power terminal and a connection node. The second resonance capacitor is connected between the connection node and a reference voltage terminal. A first terminal of the resonant element is connected to the connection node. The first voltage switch is connected between the power terminal and a second terminal of the resonant element. The second voltage switch is connected between the second terminal of the resonant element and the reference voltage terminal. The controller controls the first voltage switch and the second voltage switch so that a voltage value at the connection node is within a set range.

This invention discloses a half-bridge type coreless solid-state transformer for power frequency based on the parity-time symmetry principle, comprising an input filter, first and second single-phase matrix converters, first and second resonant capacitors, a coreless winding, and an output filter. The input filter is connected in parallel to the input terminal of the first single-phase matrix converter; the output terminal of the first single-phase matrix converter is connected in series with the first resonant capacitor; the coreless winding includes a first coreless winding and a second coreless winding, with the first coreless winding connected in series with the first resonant capacitor, and the second coreless winding connected in series with the second resonant capacitor; the input terminal of the second single-phase matrix converter is connected in series with the second resonant capacitor; the output filter is connected in parallel to the output terminal of the second single-phase matrix converter. This invention revolutionarily eliminates the transformer core and achieves efficient power transmission and voltage transformation functions, significantly reducing the weight and volume of the transformer. Furthermore, it eliminates the production and manufacturing costs of core components, increases power density, and is expected to significantly reduce costs.

This application belongs to the field of microinverter architecture and control technology, and more specifically, relates to a half-bridge resonant dual active bridge microinverter and a seamless switching method for modulation modes. This application constructs an inverter for AC-DC energy conversion using a single-stage DC-AC topology built with a DC-side half-bridge circuit and a matrix-type AC-side half-bridge circuit. The connection method between each resonant capacitor is set to a bridge arm multiplexing type, enabling each resonant capacitor to simultaneously possess voltage division and resonance functions, effectively improving the inverter's power density. When switching between DCM and SPS modulation modes, by determining the time segment distribution of each modulation stage of the corresponding modulation mode within the target operating cycle and the target state trajectory radius corresponding to the resonant inductor current, the duration of the target time segment corresponding to each modulation mode can be adjusted, effectively achieving seamless switching between modulation modes and reducing the THD of the output voltage and the oscillation of the inductor current.

In a power converter, a plurality of resonant capacitors are provided one to one for a plurality of switches, respectively. Each of the plurality of resonant capacitors is connected between a first terminal of a corresponding one of the plurality of switches and a second DC terminal. A controller controls a plurality of first switching elements, a plurality of second switching elements, and the plurality of switches. When determining that two-phase resonant currents corresponding to two switching circuits belonging to a plurality of switching circuits flow simultaneously through a resonant inductor, the controller performs control of shifting respective ON periods of the first switching element and the second switching element in one switching circuit out of the two switching circuits.

An asymmetric half-bridge flyback switching power supply, its control chip, and control method are provided. The asymmetric half-bridge flyback switching power supply includes a first power switch, a second power switch, a resonant capacitor, and a transformer. The control chip is configured to: generate an upper-side control signal for controlling the on / off state of the first power switch based on an output feedback signal characterizing the output voltage of the asymmetric half-bridge flyback switching power supply and a current sensing signal characterizing the current flowing through the primary inductance of the transformer; and generate a lower-side control signal for controlling the on / off state of the second power switch based on the output feedback signal and a voltage sensing signal characterizing the voltage across the auxiliary inductance of the transformer. When the first power switch is in the off state, the duration of discharge of the resonant capacitor through the second power switch to the primary inductance of the transformer is proportional to a voltage value that is the charging voltage of the primary inductance of the transformer when the first power switch is in the on state.

The application discloses a switching circuit and a control method thereof. The switching circuit comprises a power input module, a resonant capacitor, a resonant inductor, a transformer, a voltage output module and a working mode control module. The voltage output module comprises a voltage output path, an LLC mode path and an AHB mode path connected with the voltage output path respectively. The AHB mode path comprises a first triode, and the LLC mode path comprises a second triode. When the first triode is turned on and the second triode is turned off, the switching circuit works in the AHB mode. When the first triode is turned off and the second triode is turned on, the switching circuit works in the LLC mode. The application has the advantages of LLC topology and AHB topology, can adopt the LLC topology to ensure the efficiency and EMI performance of high-frequency application, and can adopt the AHB topology to meet the demand of large input-output variation range.