716 results about "Resonant capacitor" patented technology

In a circuit element 10a, resonant circuits are arranged in parallel. A resonant capacitor Crkq of a q-th resonant circuit arranged in parallel has one end connected in series to a resonance reactor Lrq and a primary winding N1q of a transformer Trq. The resonant capacitor Crkq of the q-th resonance circuit arranged in parallel has another end connected to the resonant capacitor Crkq of a q-th one of the resonance circuit arranged in parallel in another one of the circuit elements 10a so that a k-dimensional multiphase LLC converter having a phase difference of 360° / Pk is constructed by Pk circuit elements.

A multi-phase LLC resonant converter circuit (10) includes: first to third LLC resonant converters each including a series circuit (S1 to S3) of a first switch and a second switch that are connected in parallel to a DC power supply, a high-frequency transformer (T1 to T3) including a primary-side winding and a secondary-side winding, a resonant circuit including a resonant reactor (Lr1 to Lr3) connected between a connection point of the first switch and the second switch and one end of the primary-side winding, a resonant capacitor (Cr1 to Cr3) in which one end is connected to the other end of the primary-side winding, and a divided resonant capacitor (Cn1 to Cn3) in which one end is connected to a connection point of the primary-side winding and the resonant capacitor; a first neutral line (N1) that connects the other end of the resonant capacitor; a neutral line reactor (Ln) connected between the first neutral line and a power supply line of the DC power supply; and a second neutral line (N2) that connects the other end of the divided resonant capacitor.

The invention discloses a CLLLC converter light load efficiency improvement and load expansion circuit based on variable resonant cavity regulation and control and a control method thereof. The circuit comprises a primary side full bridge, a variable resonant cavity, a secondary side rectifier and an output loop, the digital control unit detects the load in real time, and drives and switches the parallel or series capacitor branch to adjust the equivalent resonant capacitor; and the auxiliary buffer branch is used for soft start and sudden change buffer. According to the control method, capacitance is reduced during light load, efficiency is improved, capacitance is increased during heavy load, gain linearity is kept, the load range is widened, and smooth starting is achieved. The device is compact in structure and easy to control, the light load efficiency can be remarkably improved, the load application range is expanded, and the device has high reliability and good industrialization prospects.

A control circuit for an asymmetrical half-bridge flyback converter with a first switch, a second switch, a transformer and a resonant capacitor is provided. The control circuit includes an input terminal and an output terminal. The input terminal receives resonant current information. The resonant current information is associated with a resonant current flowing through a resonant tank formed by a primary winding of the transformer and a resonant capacitor. The output terminal provides a first control signal to turn off the first switch of the asymmetrical half-bridge flyback converter based on the resonant current information.

A multi-phase resonant power converter includes: a power stage on a primary side of the multi-phase resonant power converter, the power stage including bridge converter legs each configured to receive an AC input voltage and implement a separate phase of the power converter; a transformer device having a primary side winding for each bridge converter leg and a secondary side winding for each primary side winding; a power circuit electrically connected to the secondary side windings on a secondary side of the multi-phase resonant power converter; a primary-side controller configured to operate the bridge converter legs at a switching frequency; and a separate resonant tank electrically connected to a midpoint of each bridge converter leg. Each resonant tank includes a resonant capacitor in series with the primary side winding for that bridge converter leg. A resonant frequency of each resonant tank is tuned to within + / −50% of the switching frequency.

A power converter includes a transformer, a resonant circuit, a first switch and a second switch, a resonant adjustment circuit, and a controller. The transformer includes a primary-side winding and a secondary-side winding coupled to the primary-side winding. The resonant circuit is coupled to the primary-side winding, and the resonant circuit includes a resonant capacitor and a resonant inductor provided by at least the primary-side winding. The first switch and the second switch are commonly connected to a node, and the node is coupled to the resonant circuit. The resonant adjustment circuit is coupled to the resonant circuit. The controller is used to control an enabled time of the resonant adjustment circuit according to an output voltage of the power converter so as to maintain the efficiency of transmitting the energy from the primary-side winding to the secondary-side winding under a full output voltage range.

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.

A control method and system for a resonant converter. The control method for a resonant converter comprises: in each switching cycle, determining a target power value on the basis of an input power control amount and a compensation amount corresponding to a bridge leg (S101); on the basis of the target power value, an input voltage, circuit parameters of the resonant converter, and the current operating mode of a full-bridge inverter module, determining a target slope control amount corresponding to a counter which corresponds to a switching transistor (S102); determining a comparison threshold on the basis of the target slope control amount, the current count value of the counter which corresponds to the switching transistor, and a DC bias voltage of a resonant capacitor corresponding to the current operating mode, wherein the counter starts counting using the DC bias voltage as an initial value in each switching cycle until the actual voltage of the resonant capacitor is equal to the comparison threshold (S103); and determining a control signal on the basis of the actual voltage of the resonant capacitor and the comparison threshold, and controlling the switching transistor on the basis of the control signal (S104).

The invention is suitable for the technical field of resonant converters, and provides a starting control circuit and a resonant converter. The starting control circuit comprises a feedback module, a comparison selection module and a logical operation module, the comparison selection module is electrically connected with the feedback module and the logical operation module, the feedback module is used for being electrically connected with the output end of a resonant conversion circuit in the resonant converter, and the logical operation module is used for being electrically connected with a driving circuit in the resonant converter. According to the starting control circuit provided by the embodiment of the invention, the resonant capacitor voltage constraint threshold value which is gradually enlarged along with the starting process can be constructed, smooth establishment of resonant capacitor direct current bias is realized, the fluctuation amplitude of the resonant capacitor voltage is limited, the problem that the total bus voltage is applied to the resonant inductor in a traditional scheme is avoided, and the starting control circuit is suitable for a high-voltage power supply. Finally, the resonance current peak value in the starting stage is effectively suppressed, and the impact of current stress on core devices such as a switching tube and a resonance inductor is reduced.

A resonant flyback power converter includes: a first transistor and a second transistor which are configured to switch a transformer and a resonant capacitor for generating an output voltage; and a switching control circuit generating first and second driving signals for controlling the first and the second transistors. The turn-on of the first driving signal magnetizes the transformer. The second driving signal includes a resonant pulse having a resonant pulse width and a ZVS pulse during the DCM operation. The resonant pulse is configured to demagnetize the transformer. The resonant pulse has a first minimum resonant period for a first level of the output load and a second minimum resonant period for a second level of the output load. The first level is higher than the second level and the second minimum resonant period is shorter than the first minimum resonant period.

The invention discloses a soft switching HERIC non-isolated inverter and a modulation method thereof, and belongs to the technical field of inverters, the inverter comprises a bridge arm circuit, a clamping circuit, a resonance circuit, a voltage stabilizing circuit and a filter circuit, the resonant circuit comprises a first auxiliary switch tube, a second auxiliary switch tube, a third auxiliary switch tube, a fourth auxiliary switch tube, a first resonant inductor, a second resonant inductor, a first resonant capacitor and a second resonant capacitor; all high-frequency switches realize zero-current turn-on and turn-off at the same-direction stage of the voltage and the current of the power grid through the resonance circuit; all the high-frequency switches also realize zero-current switching on and switching off in the voltage and current reverse phase of the power grid; according to the modulation method, unipolar PWM modulation is adopted, the grid-connected current harmonic distortion rate is reduced, the grid-connected electric energy quality is improved, and the application value and prospect are huge.

A coil assembly for wireless electrical power transmission includes a plurality of external connecting terminals, a power feeding coil, a resonant capacitor electrically connecting with the power feeding coil, and busbars each of which electrically connects between the external connecting terminals.

The invention relates to an external phase shift angle determination method and system, a frequency conversion phase shift control method and a chip, and the method comprises the steps: obtaining an external phase shift angle based on a general solution of a time domain differential equation of a resonant inductor current and a resonant capacitor voltage of a DBSRC equivalent circuit and the symmetry of the DBSRC equivalent circuit; determining a first current value of the resonant inductor at the first moment and a second current value of the resonant inductor at the second moment; based on the first current value when the primary bridge circuit meets the ZVS soft switching requirement, obtaining a first relational expression of the external phase shift angle about the input voltage and the output voltage of the DBSRC and the switching frequency of the switching tube; based on a second current value when the secondary-side bridge circuit meets the ZVS soft switching requirement, obtaining a second relational expression of the external phase shift angle with respect to the input voltage, the output voltage and the switching frequency; according to the first relational expression, the second relational expression and the steady-state voltage value of the output end of the DBSRC, the expression of the external phase shift angle about the switching frequency, the steady-state voltage value and the input voltage is determined; the scheme is simple, the accuracy is high, and the portability is high.

An electronic device and a control method for the electronic device are provided, and relate to the field of wireless charging technologies, to improve compatibility of a power receiving terminal device in wireless charging with a power transmitting terminal device by improving ASK communication quality. The electronic device includes a device circuit (50), a voltage conversion circuit (203), a rectifier circuit (202), a resonant circuit (201), and a modulation circuit (204). The resonant circuit (201) includes a resonant inductor (L2) and a resonant capacitor control circuit (ci1) connected in series to the resonant inductor (L2). A first end of the resonant inductor (L2) is coupled to the rectifier circuit (202), a second end of the resonant inductor (L2) is coupled to a first end of the resonant capacitor control circuit (ci1), and a second end of the resonant capacitor control circuit (ci1) is coupled to the rectifier circuit (202).

The invention relates to a high-precision isolation converter and a control method thereof, the isolation converter comprises a half-bridge switch circuit, when one switch tube of the half-bridge switch circuit is switched on, an excitation inductor, a resonant inductor, a resonant capacitor and the switch tube form a resonant network; the detection error amplification circuit obtains a first detection signal representing output voltage information by detecting a high-order end node voltage of a transformer primary winding, and obtains a compensation signal by performing error amplification on the first detection signal and a preset reference voltage. And the frequency and duty ratio modulation circuit obtains a switching control signal according to the compensation signal, the inductive current sampling signal and a preset frequency signal so as to control the switching action of the half-bridge switching circuit, thereby controlling the output signal of the isolation converter to be stable. Feedback control is carried out through output voltage detection, so that the output of the LLC isolation converter is stable and is not influenced by circuit parameters.

The invention discloses a high-side series drive sodium battery protection method and system, and relates to the technical field of battery protection, and the method comprises the steps: collecting the data information of each monomer of a sodium battery pack through a sensor, and carrying out the preprocessing; judging based on the preprocessed data, and starting balancing operation; a PWM signal with a fixed frequency is generated to control the on and off of the MOSFET switch; and the duty ratio and the frequency of the PWM signal are adjusted in real time by monitoring the voltage fluctuation of the resonant capacitor. Through an active equalization mode of the switched capacitor, efficient equalization of voltage in the battery pack is realized, energy loss and heating are reduced, and the service life of the battery is prolonged. According to the invention, a high-side protection framework is adopted, so that the system can keep stable communication even when battery protection is triggered, and the overall safety and stability are improved; the system integrates a self-developed chip master control module and SOC calculation and fault diagnosis functions, can monitor the battery state in real time and perform intelligent management, and significantly improves the reliability and expansibility of the system.

In a bidirectional switch of a power converter, a first terminal thereof is connected to a connection node between a first switching element and a second switching element. A resonant capacitor is connected between the first terminal of the bidirectional switch and a second DC terminal. A resonant inductor is connected to a second terminal of the bidirectional switch. A regenerative element is connected between the resonant inductor and the second DC terminal. A first control unit controls the first switching element and the second switching element. A second control unit controls the bidirectional switch. A limiter limits the absolute value of a voltage variation rate of a voltage applied between the first and second terminals of the bidirectional switch to a threshold value or less.

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.

A controller for a resonant converter. The resonant converter comprising: a first switch and a second switch connected in series with each other between the supply source and a reference terminal; and a resonant tank that is electrically connected to the first and second switches, wherein the resonant tank comprises a resonant capacitor. The controller is configured to: receive a measured voltage signal that represents the voltage at a predetermined point in the resonant tank; determine voltage-correction-signalling based on a measured current signal, which represents the current flowing in the resonant tank; and in response to the measured voltage signal crossing a voltage threshold value, after the application of the voltage-correction-signalling to either the measured voltage signal or the voltage threshold value as an offset, change the state of the first switch and the second switch.

The topology reconfigurable modular multi-level power amplifier belongs to the field of ultra-precision motor drive technology. The invention solves the problem that the existing linear power amplifier works in the linear amplification area of ​​the switch device, has high loss and low efficiency, thus limiting the improvement of the power level. It includes: a power supply, a multi-level circuit and a filter circuit. The multi-level circuit includes: power switches are cascaded in sequence, resonant capacitors are respectively connected in parallel with the power switches, and fast capacitors C q1 Connect to the power switch S n+1 The source of the power switch S n+4 Between the drain of, ..., the fast capacitor C q(n+1) Connect the source of power switch S1 to the power switch S 2n+4 The drain of S1 is connected to the positive terminal of the power supply, and S 2n+4 The source is connected to the negative terminal of the power supply, and the power switch S n+2 The source is connected to the input end of the filter circuit, and the output end of the filter circuit is connected to the motor coil winding load. The invention is used for an ultra-precision motor system.

The invention provides a multi-mode DC-DC converter topological structure and a control method thereof, and the structure comprises a first switching power supply circuit which is connected to a high-voltage platform, and achieves the conversion between a DC voltage and an AC square wave voltage through a plurality of switching tubes which are in complementary conduction; the LLC resonant circuit realizes high-low voltage conversion through a resonant capacitor C1, a resonant inductor L1 and an excitation inductor; the BUCK circuit is used for outputting a first low voltage; and the second switching power supply circuit is connected to the tap of the secondary winding of the LLC resonant circuit and is used for outputting or inputting a second low voltage. According to the DC-DC converter topological structure, multiple working modes of conversion between high voltage and first low voltage and between high voltage and second low voltage can be achieved, a new energy automobile adopts the DC-DC converter with the topological structure, 800 V voltage can be converted into 12 V voltage to supply power to a small storage battery, meanwhile, reverse working can be achieved, pre-charging is conducted on the high-voltage side, and the power consumption of the new energy automobile is reduced. And 800V voltage can be converted into 48V voltage to supply power to the PDCC, so that the device is convenient and efficient, and has good economical efficiency.

A coil structure for near-field wireless power transfer, integrating the traditional inductor and external capacitor structure into one single coil and forming a series resonance. The series resonance is achieved by a terminal connection and layering method. The electric field is canceled via a distributed turn-to-turn interleaving structure. With the integrated capacitor, the costs and space of a resonant capacitor can be saved. With the canceled electric field, the interference with neighboring components, such as touch-screen, can be reduced. Other benefits can include low-profile and fabrication convenience based on RGB technology. This coil can be useful for both consumer electronics and electric vehicle wireless charging.

A power converter includes a transformer, a resonant capacitor, a high-side transistor, a low-side transistor, a rectification circuit, a feedback circuit, a detection circuit, and a control circuit. The transformer includes a primary coil coupled to a switch node and a secondary coil. The resonant capacitor is coupled to the primary coil. The high-side transistor provides an input voltage to the switch node, and the low-side transistor couples the switch node to the ground. The rectification circuit converts the energy of the secondary coil into an output voltage. The feedback circuit compares the output voltage with a reference voltage to generate a compensation signal. The detection circuit generates a current detection signal and a voltage detection signal. The control circuit drives the high-side transistor and the low-side transistor based on the current detection signal, the voltage detection signal, the compensation signal, and the input signal.

The invention discloses an induction cooker driving circuit which comprises a mains supply input port, a control module, a rectifier module, a switching tube driving module, an oscillation module, an output port and a synchronization module. According to the technical scheme, a plurality of groups of corresponding switch tube driving modules and oscillation modules are configured, and the synchronization module is connected with one oscillation module. The control module detects the synchronizing signals of the coil panel connected with the output port and the resonant capacitor in the oscillating circuit through the synchronizing module and controls the switching tube driving modules according to the synchronizing signals, the switching tubes in the scheme do not need to be arranged in parallel, and the performance characteristics of the switching tubes can be brought into full play; state synchronization of each switch tube is guaranteed, and heating efficiency of the induction cooker is effectively improved.

A switching control circuit for use in controlling a resonant flyback power converter generates a first driving signal and a second driving signal. The first driving signal is configured to turn on the first transistor to generate a first current to magnetize a transformer and charge a resonant capacitor. The transformer and charge a resonant capacitor are connected in series. The second driving signal is configured to turn on the second transistor to generate a second current to discharge the resonant capacitor. During a power-on period of the resonant flyback power converter, the second driving signal includes a plurality of short-pulses configured to turn on the second transistor for discharging the resonant capacitor. A pulse-width of the short-pulses of the second driving signal is short to an extent that the second current does not exceed a current limit threshold.

The present application relates to a method and apparatus for controlling a wireless electrical energy transmission system, and a computer device. The method comprises: determining a real-time load resistance of a wireless electrical energy transmission system, and obtaining a trained value table, the trained value table comprising a sample load resistor, a sample primary resonant capacitor, and a sample value of correspondence between each sample load resistor and each sample primary resonant capacitor; in the trained value table, determining a real-time primary resonant capacitor of the wireless electrical energy transmission system on the basis of the real-time load resistance and the sample value; and controlling the wireless electrical energy transmission system on the basis of the real-time primary resonant capacitor. By adopting the present method, the convenience of control can be improved.

The present disclosure provides a control method applicable for a resonant converter. The control method includes steps of: (a) determining a voltage gain of the resonant converter according to the input voltage, a turn ratio of the transformer and the output voltage, and determining a resonant frequency according to an inductance of the resonant inductor and a capacitance of the resonant capacitor; (b) determining an output current of the resonant converter according to the switching frequency, the voltage gain and the resonant frequency; and (c) adjusting the switching frequency when the output current is not equal to a reference current, and performing the step (b) again.

The invention relates to the technical field of wireless charging, and provides a resonant capacitor change-over switch circuit for wireless charging and a working method thereof, the circuit comprises a receiving end circuit, a starting circuit and a charge pump circuit which are connected in sequence; and the charge pump circuit is used for driving the starting circuit to start the receiving end circuit in a low-frequency mode after the output voltage of the receiving end circuit is subjected to bootstrap voltage-multiplying processing. According to the invention, the charge pump circuit is ingeniously utilized to increase the output voltage Vrect of the internal circuit of the receiving end to two times of the level, and the minimum voltage required when the change-over switch is started is remarkably reduced, so that the starting problem in a low-frequency mode is effectively solved.

A bidirectional voltage conversion device includes a first half-bridge switching circuit, a transformer, a first resonant capacitor, a double-pole double-throw relay, a second half-bridge switching circuit, a resonant inductor and a second resonant capacitor. The first half-bridge switching circuit is coupled to a high-voltage power storage device. The first resonant capacitor is coupled to the first half-bridge switching circuit and a primary winding. The double-pole double-throw relay is coupled to a first secondary winding, a second secondary winding and a grounding terminal. The second half-bridge switching circuit is coupled to a low-voltage power storage device. The resonant inductor and the second resonant capacitor are coupled in series between the second half-bridge switching circuit and a node between the first secondary winding and the second secondary winding.

The invention relates to a single-stage AC-DC converter and a control circuit. The single-stage AC-DC converter comprises a filter, an input rectifier, a filter capacitor Cin, a first switch bridge arm, a second switch bridge arm, a capacitor Cb, an inductor Lb, a resonant cavity formed by a resonant inductor Lr and a resonant capacitor Cr, a transformer T, an output rectifier and an output capacitor Co. According to the invention, a traditional two-stage AC-DC converter and a control circuit are simplified. Compared with a single-stage AC-DC converter in the prior art, the problem that the current of a resonant cavity is too large can be solved only by adding one inductor, meanwhile, the control strategy is simple, the frequency range conversion of a switching tube is small, and soft switching of the switching tube is easy to achieve, so that high efficiency is easy to obtain, input current can be corrected to achieve a high power factor, and the power factor is high. And the output voltage ripple is small, and the method has remarkable engineering application value and market prospect.