13 results about "Zero current switching" patented technology

The invention relates to the technical field of power control, in particular to a filter and leakage inductance collaborative design method of a single-stage bidirectional high-frequency isolation inverter, which comprises the following steps: acquiring basic design parameters, constructing an inverter modulation model according to a modulation strategy, and solving the model to obtain a modulation signal expression; deriving a zero-current switching current constraint condition and a zero-voltage switching current constraint condition of the switching tube based on a modulation strategy; combining the constraint condition with an inverter modulation model, and solving to obtain a soft switching constraint condition; according to the soft switching constraint condition and the value range of the modulation signal expression, determining a collaborative value range of the filter inverter side inductance and the transformer leakage inductance meeting the soft switching requirement; and selecting design parameters of inverter side inductance and transformer leakage inductance of the filter, and determining other circuit parameters of the filter according to a reactive power demand and a grid-connected harmonic standard. According to the invention, the problems of soft switching failure, loss increase and electromagnetic interference caused by parameter mismatching can be effectively suppressed.

A discrete battery module configured for energy transfer in a power system together with a plurality of other battery modules. Each module one or more battery cells, and a primary structure The primary structure includes a primary flux guide component, and a primary winding associated with the primary flux guide component, a switching circuit coupled to the battery cell and the primary winding and configured to generate an alternating current output; and a primary controller configured to operate the switching circuit. The battery module is adapted to removably engage with a secondary module, in use, such that the engagement causes alignment with a secondary structure of the secondary module. The secondary structure has a plurality of secondary flux guide components, one secondary winding associated with the plurality of the secondary flux guide components; such that the alignment causes the primary and secondary flux guide components to be arranged in complementary sets with a predetermined geometrical alignment for magnetic coupling. Each set produces a current transformer with a defined coupling factor that supports the energy transfer operation characteristics of the system.

A modular, multiport power conversion system includes a central transformer with a plurality of windings inductively connected to the central transformer. The plurality of windings are connected to ports able to connect to both AC and DC-devices, including both power sources and power consuming nodes. Each port is able to be selectively galvanically isolated, such that a controller is able to determine from which ports power is drawn and / or to which ports power is transferred. The system is operable to use zero voltage switching (ZVS) and / or zero current switching (ZCS) for each port to reduce power loss and increase efficiency, especially for high frequency embodiments.

A system for quasi-resonant high-frequency trans-spinal magnetic stimulation for a region of a spine of a subject incudes a signal generator including a bulk capacitor bank (BCB), am H-Bridge in signal communication with the BCB, and a resonant capacitor bank (RCB) in signal communication with the H-bridge. The system further includes a controller in signal communication with the signal generator and configured to: 1) provide pulse sequence having a set of pulse sequence parameters to the signal generator including a pulse frequency configured to enable the RCB to operate in a quasi-resonance mode and 2) to control the H-bridge based on the pulse sequence, wherein the pulse sequence is configured to provide sequence-controlled zero current switching (SCZCS).

The application relates to the technical field of power control, in particular to a filter and leakage inductance collaborative design method of a single-stage bidirectional high-frequency isolation inverter, which comprises the following steps: obtaining basic design parameters and constructing an inverter modulation model according to a modulation strategy, and solving the model to obtain a modulation signal expression; deducing zero-current switching current constraint conditions and zero-voltage switching current constraint conditions of a switching tube based on the modulation strategy; combining the constraint conditions with the inverter modulation model to solve and obtain soft switching constraint conditions; determining a collaborative value range of an inverter side inductance of a filter and transformer leakage inductance which meets the soft switching requirement according to the soft switching constraint conditions and a value range of the modulation signal expression; selecting design parameters of the inverter side inductance of the filter and the transformer leakage inductance, and determining the rest circuit parameters of the filter according to reactive power demand and grid-connected harmonic standards. The application can effectively inhibit the problems of soft switching failure, increased loss and electromagnetic interference caused by parameter mismatch.

A modular power management system with a plurality of primary battery modules. In each primary module there a bridge circuit under the control of a primary controller and configured to operatively couple one or more battery cells to a primary winding associated with a primary flux guide. Each primary flux guide is coupled by magnetic flux with a secondary flux guide from a group of secondary flux guides to thereby form a set of complementary flux guides. The group of secondary flux guides is associated with a shared secondary winding, and where the secondary winding connected with a capacitor to thereby facilitate an oscillatory current. Each primary winding of each primary module shares the oscillatory current with the secondary winding. Each primary controller is configured to determine the voltage and current magnitude and phase, and control conduction of the primary bridge to manage the current of the one or more battery cells.

According to the present invention, an output voltage or an output current is kept constant with respect to positional deviation between the electrodes of power transmission / reception pad parts, and soft switching is maintained, without increasing circuit complexity. In this electric field coupling type non-contact power supply system, a power transmission device and a power reception device are capacitively coupled via first and second electrodes of power transmission / reception pad parts. The power transmission device includes: an inverter circuit that converts a DC voltage into an AC voltage by switching and outputs the AC voltage to the first electrode via an external capacitor; and the first electrode. The power reception device includes: the second electrode; and a rectifier circuit that converts the AC voltage received via the second electrode into a DC voltage and outputs the DC voltage to a load. The inverter circuit performs zero voltage switching (ZVS) or zero current switching (ZCS) on the DC voltage while an output voltage or an output current output to the load is constant. The capacitance value of the external capacitor is smaller than the capacitance value of a capacitor between the first and second electrodes.

A modular power management system with a plurality of primary battery modules. In each primary module there a bridge circuit under the control of a primary controller and configured to operatively couple one or more battery cells to a primary winding associated with a primary flux guide. Each primary flux guide is coupled by magnetic flux with a secondary flux guide from a group of secondary flux guides to thereby form a set of complementary flux guides. The group of secondary flux guides is associated with a shared secondary winding, and where the secondary winding connected with a capacitor to thereby facilitate an oscillatory current. Each primary winding of each primary module shares the oscillatory current with the secondary winding. Each primary controller is configured to 0 determine the voltage and current magnitude and phase, and control conduction of the primary bridge to manage the current of the one or more battery cells.

The application provides a modulation method for a CLLC converter to realize bidirectional symmetric power transmission, comprising the following steps: when reverse power transmission is performed, the CLLC converter is operated in an OP mode, wherein the OP mode comprises a P stage and an O stage; in the P stage, a secondary side current is negative, the converter transmits reverse power, and the secondary side current enters the O stage after zero current switching is completed; in the O stage, the secondary side current becomes positive, enters a negative P mode, and reverse power transmission is completed; when switching between the P stage and the O stage, a 50% complementary square wave driving signal of a primary side is used for control, so that the switching frequency is the same when forward transmission and reverse transmission are performed under the same voltage gain and opposite loads, and bidirectional switching of the reverse power transmission and the forward power transmission is realized by adjusting the alignment edges of the primary side driving signal and the secondary side driving signal. The application introduces the OP mode to replace a traditional NP mode to realize bidirectional power transmission, and the frequency modulation range of the CLLC converter is reduced.

A magnetic coupling apparatus configured for wireless power transfer which includes a plurality of primary structures with a primary flux guide component and one or more primary windings associated with the primary flux guide component. There is also a secondary structure with a plurality of secondary flux guide components, and one secondary winding associated with the plurality of the secondary flux guide components. The primary and secondary flux guide components are arranged in complementary sets with a predetermined geometrical alignment for magnetic coupling and which define a current transformer. Each current transformer is defined by the coupling factor being greater than 1 / turns ratio.

A switched-mode power regulator circuit has four solid-state switches connected in series and a capacitor and an inductor that regulate power delivered to a load. The solid-state switches are operated such that a voltage at the load is regulated by repetitively (1) charging the capacitor causing a current to flow in the inductor and (2) discharging the capacitor causing current to flow in the inductor. The power regulator circuit may be configured to operate with zero current switching at frequencies in the range of 100 MHz, enabling it to be fabricated on a unitary silicon die along with the load that it powers.