639 results about "Flying capacitor" patented technology

A method of balancing voltages on flying capacitors in a multilevel power converter is provided (along with an associated controller). The power converter includes one or more flying capacitors. Pairs of switches in the power converter are controlled by pulse width modulated (PWM) control signals. The different pairs of switches are controlled by PWM control signals having a phase / timing shift between them. To balance the voltage on the one or more flying capacitors, one set of pulses can be widened or narrowed while another set is widened or narrowed. To change their widths, one edge of each pulse is modulated, while the other edge is unchanged. More specifically, the leading edge of one set of pulses is modulated, while the trailing edge of the other set of pulses is modulated.

The invention discloses a clamping type multi-level converter and a control method, relates to the field of clamping, and aims to enable the voltage of a flying capacitor in the multi-level converter to be 1 / (N-1), 2 / (N-1)... (N-2) / (N-1) times of Vbus voltage (bus voltage) even if the voltage of the flying capacitor is in a steady state. The number of the clamping units is the same as that of the flying capacitors, and each flying capacitor is connected in series with the equivalent capacitors of the corresponding number of bus capacitors through the corresponding clamping unit when the multi-level converter switching tube is closed, so that each flying capacitor is clamped through the voltage of the corresponding number of equivalent bus capacitors; and the voltage of the flying capacitor in the multi-level converter can be ensured to be in a steady state without closed-loop control.

In accordance with some embodiments of the present disclosure, a multi-level power converter circuit includes a flying capacitor, a balancing capacitor to control a voltage across the flying capacitor, a plurality of converter switches, a control switch coupled between the flying capacitor and the balancing capacitor, and control circuitry to open and close the control switch based on states of at least two converter switches of the plurality of converter switches. In some embodiments, the multi-level power converter is a three-level buck converter, and the balancing capacitor maintains a voltage across the flying capacitor to be within a threshold range of half the input voltage of the buck converter. In some embodiments, a method for operating the multi-level power converter includes using control circuitry to operate the plurality of converter switches and the control switch to selectively couple the balancing capacitor to either side of the flying capacitor.

A radio frequency to direct current (RF-DC) converter for harvesting radio frequency energy includes an antenna circuit, and a plurality of cross-coupled differential-drive (CCDD) rectifier stage. The antenna circuit receives RF signals and outputs a positive signal at a positive RF terminal and outputs a negative signal output at a negative RF terminal. Each CCDD rectifier stage includes a first NMOS transistor, a first PMOS transistor, a second NMOS transistor and a second PMOS transistor. Each CCDD rectifier stage further includes two flying capacitors and two body capacitors. An input terminal is connected to a connection point between a source terminal of the first NMOS transistor and a source terminal of the second NMOS transistor. An output terminal is connected to a connection point between a source terminal of the first PMOS transistor and a source terminal of the second PMOS transistor.

The invention provides a control method of a four-level hybrid clamping converter, and the core principle is to select a switching state which minimizes a cost function through a model predictive control (MPC) strategy. The topological structure and the working principle of the 4L-HCC converter are deeply researched, a traditional MPC control strategy is adopted, the charging and discharging process of the capacitors is accurately controlled, voltage fluctuation of the direct-current bus capacitor and the flying capacitor at low frequency and zero frequency is effectively restrained, safe operation of the capacitors, switches and other elements is guaranteed, and the stability and reliability of the converter are improved. By reasonably designing the cost function, the converter can output high-quality electric energy under different working conditions, the distortion of load voltage and current is reduced, the requirements of application scenes with high requirements on electric energy quality, such as motor driving and renewable energy power generation grid connection, are met, and the performance of the system is comprehensively improved.

A reconfigurable flying capacitor multilevel input stage accepts a wide range of input voltages. The input stage divides and inverts a DC input voltage. Generally, output voltage regulation is achieved by adjusting the power switches' duty ratio in the input stage for non-resonant converters and by adjusting the switching frequency for resonant converters.

The present invention discloses a boost converter power stage circuit, comprising: an organic light-emitting diode power management integrated circuit unit, a switched capacitor converter, and a boost converter, wherein, a flying capacitor is used to boost the voltage of the inductor to twice the voltage, and then the positive voltage of the output voltage source is boosted, and then use the switched capacitor converter to output the voltage in order to obtain the conversion of the negative voltage.

A switched capacitor converter can include a switched capacitor stage comprising a flying capacitor and a ladder of three switching devices. A first switching device can be connected between a DC input of the switched capacitor converter and an AC bus. A second switching device is connected between the DC input and a third switching device. The third switching device can be connected between the second switching device and ground. The flying capacitor can be connected between the AC bus and a junction of the second switching device and the third switching device. The switched capacitor converter can further include an inverter stage having an input coupled to the AC bus and an output that delivers an AC voltage.

A multi-level direct current converter, a voltage control method for a flying capacitor, and a control apparatus are provided. The multi-level direct current converter includes a controller, a flying capacitor, two switching transistor groups, and an inductor. The method for controlling a flying capacitor includes: in response to that an absolute value of a difference between a sampling voltage and a reference voltage of the flying capacitor is greater than a first threshold, adjusting a duty cycle difference between first switching transistors in two switching transistor groups or a phase difference between carriers of first switching transistors in two switching transistor groups based on a magnitude of an inductor current. According to this application, a voltage of the flying capacitor can be controlled, to improve operation stability of the multi-level direct current converter.

According to some embodiments, a multi-level power converter, includes an output terminal, a reference terminal, an inductor, a flying capacitor, a first switching stage including a first switch connected to the output terminal and connected to the flying capacitor at a first node, and a second switch connected to the flying capacitor at a second node and connected to the reference terminal, a second switching stage including a third switch connected to the first node and the inductor, and a fourth switch connected to the inductor and the second node, and a pre-charge unit connected to the flying capacitor and the output terminal and configured to pre-charge the flying capacitor based on a voltage at the output terminal during a start-up cycle of the multi-level power converter.

In one embodiment, a multi-level, bridgeless boost power factor correction (PFC) device, comprising: a circuit comprising an inductor, and at least a first pair and a second pair of switches and a capacitor arranged in a flying capacitor, totem-pole configuration; and a control circuit configured to drive the at least first and second pairs of switches in such a way as to reduce distortion in a line current, wherein for the first and second pairs of switches, the control circuit is configured to: for a first half line cycle, drive a first switch of each pair during an entire interval of the first half-line cycle and a second switch of each pair for less than the entire interval; and for a second half-line cycle, drive the first switch of each pair for less than an entire interval of the second half-line cycle and the second switch of each pair during an entire interval of the second half-line cycle.

A first flying capacitor circuit and a second flying capacitor circuit are connected in series so as to be in parallel to a high voltage side DC part. A reactor is connected to a positive side terminal of a low voltage side DC part and a midpoint of the first flying capacitor circuit. A midpoint of the second flying capacitor circuit is connected to a negative side terminal of the low voltage side DC part. A node between the first flying capacitor circuit and the second flying capacitor circuit is connected to an intermediate potential node of the high voltage side DC part.

An electronic device comprising: a charger integrated circuit configured to perform a buck converting operation based on an input voltage applied to a first node thereof to generate an output voltage output to a second node thereof, wherein the charger integrated circuit includes: a power switching circuit including a flying capacitor; a current sensing circuit that includes an inductor; and a control circuit that includes: a compensation circuit that is configured to compensate an inductor current value that is sensed from the current sensing circuit; an error voltage select circuit that is configured to generate a minimum error voltage based on feedback signals; and a comparison circuit that is configured to control a voltage of the flying capacitor, wherein the control circuit is configured to generate a control voltage by modifying the inductor current value based on the minimum error voltage and provide the control voltage to the comparison circuit.

Systems and methods for supplying power (both active and reactive) at a medium voltage from a DCSTATCOM to an IT load without using a transformer are disclosed. The DCSTATCOM includes an energy storage device, a two-stage DC-DC converter, and a multi-level inverter, each of which are electrically coupled to a common negative bus. The DC-DC converter may include two stages in a bidirectional configuration. One stage of the DC-DC converter uses a flying capacitor topology. The voltages across the capacitors of the flying capacitor topology are balanced and switching losses are minimized by fixed duty cycle operation. The DC-DC converter generates a high DC voltage from a low or high voltage energy storage device such as batteries and / or ultra-capacitors. The multi-level, neutral point, diode-clamped inverter converts the high DC voltage into a medium AC voltage using a space vector pulse width modulation (SVPWM) technique.

A voltage source multi-level converter topology and a control method thereof. The voltage source multi-level converter topology includes two groups of half-bridge circuits, two groups of flying capacitors and a plurality of switches. Each group of half-bridge circuits include two direct-current connection ends, and outputs of the two groups of half-bridge circuits are both connected, through a switch, to the two groups of flying capacitors that are in series. A neutral point of a connection between the two groups of flying capacitors is connected to an alternating-current end through two switches that are in reverse series, and an overall positive electrode and an overall negative electrode of the two groups of flying capacitors that are in series are respectively connected to the alternating-current end through switches.

The invention discloses a flying capacitor voltage prediction method based on a neural network. The method comprises the following steps: S10, collecting a switching signal, an output voltage and a capacitor voltage true value of a flying capacitor multi-level converter FCMC in a no-load to full-load operation process through a model prediction controller MPC; s20, a double-layer feed-forward neural network is constructed, a defined input vector and a defined output vector are recorded, the input vector comprises a switching signal and an output voltage at the current moment and a flying capacitor voltage estimated value at the previous moment, and the output vector is the flying capacitor voltage estimated value at the current moment; s30, repeating the step S10 and the step S20 by taking different capacitor voltages as initial conditions; s40, performing off-line training on the neural network by using a back propagation algorithm BP, optimizing network weight and bias, and enabling network output to approach real voltage of flying capacitor operation at the moment; and S50, deploying the trained neural network to an FPGA controller, and estimating the flying capacitor voltage online in real time in combination with a model predictive control MPC algorithm.

A controller for a multi-level power converter that utilizes a look-up-table (LUT) in combination with a fast flash analog-to-digital converter (ADC) circuit to implement a complex set of control states for the multi-level power converter. Since the set of control states can be pre-processed, a LUT is very well suited for such selecting such control states. This technique can be fast because the delay is only the LUT access time, rather than the propagation delay through a complex network of combinational logic. The fast flash ADC has been designed to achieve all the following: high conversion speed, high resolution, small layout area, low power, and the ability to meet the requirements for properly balancing fly capacitor voltages in a multi-level converter cell.

A Hybrid Switched Capacitor Converter (HSCC) topology is presented that is suitable for high conversion ratio Point-of-Load (PoL) applications. The topology specifically targets 48V to 1V power delivery in space-based high-performance computing systems, where size and weight are important considerations, along with device de-rating for radiation tolerance. One implementation merges an initial 2:1 switched capacitor conversion stage with a symmetric dual inductor hybrid (SDIH) conversion stage, reaping benefits of both. The SDIH stage offers reduced component count and an excellent switch stress figure of merit, while the initial 2:1 voltage reduction stage significantly reduces the volume of flying capacitors, enabling compact size and low weight.

Provided in the present invention is a multi-level isolated buck type DC / DC converter, comprising two transformers, wherein a primary side of each transformer is provided with a single winding, and a secondary side thereof is provided with two windings; the primary sides of the two transformers are connected in series and are then connected to an LLC resonant circuit, so as to implement isolation and voltage regulation; the other side of the LLC resonant circuit is connected to a flying-capacitor-clamped five-level half-bridge switch network, so as to reduce voltage stress; and the secondary sides of the two transformers are each sequentially connected to a rectifier bridge and a buck circuit, output ends of the two buck circuits are in interleaved parallel connection, and the buck circuits are responsible for closed-loop voltage stabilization regulation, thereby realizing high-gain buck of the converter. Compared with conventional LLC converters, the present invention can significantly reduce voltage stress, can achieve a wider input voltage range and high-gain buck, and can significantly reduce switching loss and improve the efficiency of the converter.

The present disclosure provides a power conversion circuit and a power conversion method. The power conversion circuit includes: a flying capacitor; an energy storage capacitor; and a rectifier configured to turn on a charge path through which the flying capacitor is charged by the AC input voltage or a transfer path from the flying capacitor to the energy storage capacitor selectively according to a direction of the AC input voltage, so as to provide the DC output voltage across ends of the energy storage capacitor, wherein the rectifier is further configured to stabilize the DC output voltage within a set range by controlling a discharge path of the flying capacitor to ground. Compared with conventional AC-DC converters, no high-voltage device and other rectifying circuit is needed in the power conversion circuit of the present disclosure, so as to reduce structure complexity and cost of the circuit greatly.

The invention provides a switched capacitor converter circuit control time sequence method, device and equipment, a medium and a program product, and the method comprises the steps: disconnecting a switch connected to a power end and an output end during the conversion from series connection to parallel connection, and cutting off a current path between the power end and the output end; the flying capacitors are sequentially connected in parallel between the output end and the ground from the output end; when parallel connection is converted into series connection, a current path between the flying capacitors and the output end is cut off firstly, then the flying capacitors are sequentially connected in series from the power end, and finally the power end is closed to be connected with the series switch of the uppermost flying capacitor, so that a series access from the power end to the output end is formed. According to the invention, the damage risk of the power tubes in the switched capacitor converter and the voltage withstanding requirement of part of the power tubes are reduced, and the conversion efficiency is further improved.

A charge pump includes a flying capacitor; a push-pull driver connected to a first end of the flying capacitor; a first switch provided between the first end of the flying capacitor and a first reference conductor; a second switch provided between a second end of the flying capacitor and the first reference conductor; and a third switch provided between the second end of the flying capacitor and an output terminal. The push-pull driver includes a fourth switch and a fifth switch, each of the fourth switch and the fifth switch having a first end connected to the first end of the flying capacitor. The fourth switch has a second end connected to a second reference conductor, the second reference conductor being different from the first reference conductor. The fifth switch has a second end connected to the first reference conductor.

A DC-DC converter for converting an input voltage at an input node, the converter comprising: first and second inductor nodes for connection of an inductor therebetween; first and second flying capacitor nodes for connection of a flying capacitor therebetween; a first switching network for selectively connecting the first flying capacitor node to each of the input node and the first inductor node; a second switching network for selectively connecting the second flying capacitor node to each of the input node and a reference voltage node; and reservoir circuitry, comprising: first and second reservoir capacitor nodes for connection of a reservoir capacitor therebetween; a third switching network for selectively connecting the first reservoir capacitor node to each of the first and second flying capacitor nodes; a fourth switching network for selectively connecting the second reservoir capacitor node to each of the second flying capacitor node and the reference voltage node.

A first converter includes first to fourth switching elements connected in series from a reference node toward a node fed with an input voltage, a flying capacitor, an intermediate capacitor, and a first inductor. The intermediate capacitor is provided between a connection node between the second and third switching elements and the reference node. The second converter includes a switching output stage connected to the connection node between the second and third switching elements, and a second inductor. A control circuit produces an output voltage lower than the input voltage by controlling the states of the switching elements and of the switching output stage.

The invention belongs to the technical field of power electronics, and relates to a high-side-ratio non-isolated hybrid switched capacitor converter which is used for direct 48V-1V power conversion of a data center and comprises switching tubes S1 to S38, flying capacitors C1 to C15, inductors L1 to L8, an input end Vin, an output end Vout and a grounding end. The switch tubes S1-S6 and the flying capacitors C1-C3 form a 4: 1 switched capacitor buck converter part; the switch tubes S7-S38, the flying capacitors C4-C15 and the inductors L1-L8 form a voltage-adjustable multi-channel mixed buck converter; mixing of the pre-buck converter and the voltage-adjustable buck converter is achieved through the exchange bus, the advantages of the pre-buck converter and the voltage-adjustable buck converter can be well fused, the defects of the pre-buck converter and the voltage-adjustable buck converter can be overcome, a bus decoupling capacitor is not needed, and the number of switches can be reduced. According to the multi-channel mixed buck converter, a capacitance channel is added, the conduction loss of an inductance channel is reduced, ripples are reduced, the duty ratio is increased, and the voltage stress of a switching tube is reduced; the hybrid switched capacitor converter has the advantages of being large in transformation ratio, high in power density and small in device stress.

A power supply device includes a three-level converting circuit, a dual path hybrid converting circuit and an auxiliary switch circuit. The three-level converting circuit includes a flying capacitor for three-level operation, and generates an intermediate voltage based on an input voltage, a plurality of first control signals and the flying capacitor. The dual path hybrid converting circuit includes a first path, a second path, an inductor in the first path and a hybrid capacitor in the second path, and generates an output voltage based on the intermediate voltage, a second control signal, the inductor and the hybrid capacitor. The auxiliary switch circuit controls current flow through the hybrid capacitor based on a third control signal. The power supply device operates based on a four-phase scheme or a six-phase scheme depending on an operation mode.

A vehicle system includes a first battery pack connected to a second battery pack via a flying capacitor multi-level inverter. The fling capacitor inverter has multiple inverter legs, with each inverter leg being arranged in a flying capacitor topology. A three phase motor is connected to the inverter. A controller connected to the motor and the inverter. The controller includes a memory storing instructions configured to cause the controller to control the inverter as a direct current (DC)-DC converter such that a circulating current passes through the motor, the first battery pack and the second battery pack.

An example apparatus to control a power stage circuit includes: programmable circuitry configured to: generate, in response to an instruction from an external controller, a pulse in a first local clock signal, the pulse in the first local clock signal generated when a fly capacitor in the power stage circuit has discharged for a discharge period that is less than a threshold amount of time; and generate a pulse in a second local clock signal after the fly capacitor has charged for a charge period, wherein a length of the charge period is based on the length of the discharge period.

Switched capacitor power converter circuitry configured to receive an input voltage and to output an output voltage, the switched capacitor power converter circuitry comprising: a switch network; a flying capacitor coupled to the switch network; and an output capacitor coupled to an output node of the switch network, wherein the switched capacitor power converter circuitry is operable in: a first mode in which the switch network operates at a fixed duty cycle; and a second mode in which the switch network operates at a variable duty cycle based on a predetermined flying capacitor charging threshold and a predetermined flying capacitor discharging threshold.

An interleaved flying capacitor multi-level converter includes a plurality of arms and a phase-shift PWM generation circuit. Each arm includes a flying capacitor multi-level circuit having an upper arm and a lower arm coupled at a middle node. The upper arm includes a plurality of serially coupled upper arm switches and the lower arm includes a plurality of serially coupled lower arm switches. One capacitor is correspondingly coupled between every two upper arm switches and every two lower arm switches. The phase-shift PWM generation circuit generates a plurality of switch control signals to respectively control the plurality of upper arm switches and the plurality of lower arm switches.