This disclosure provides control techniques for a resonant converter. In one control technique, for switching speeds that are below the resonant frequency of the primary stage of the converter, the switches of the synchronous rectifier (SR) portion (SR switches) of the resonant converter are controlled based on a rising edge of the corresponding primary side switch and the turn off time of a corresponding SR switch. In general, for below resonance operation, each corresponding SR switch will be turned off prior to the falling edge of each corresponding primary side switch, while each corresponding SR switch will be turned on at the rising edge of the each corresponding primary side switch. The conduction time of respective SR switches is generally constant for below resonance operation. In another control technique, for switching speeds that are above the resonant frequency of the primary stage of the converter, the SR switches are controlled based on the falling and rising edges of the voltage across the each corresponding SR switch. In general, for above resonance operation, each corresponding SR switch will be turned off after the falling edge of each corresponding primary side switch, while each corresponding SR switch will be turned on after the rising edge of the each corresponding primary side switch.

The control method, for a storage battery 100 provided in a consumer site receiving electric power supply from a system 104, includes: a first monitoring step of monitoring a first electric energy supplied from the system 104 per unit time period, where the unit time period is shorter than a predetermined time limit; a second monitoring step of monitoring a second electric energy supplied from the system 104 per predetermined time limit; a calculation step of obtaining a change over time in the first electric energy; and an instruction step of instructing the storage battery to discharge electric power to supply a load 108 located in the consumer site in accordance with the change over time in the first electric energy and with a peak value in the past pertaining to the second electric energy.

The control method, for a storage battery 100 provided in a consumer site receiving electric power supply from a system 104, includes: a first monitoring step of monitoring a first electric energy supplied from the system 104 per unit time period, where the unit time period is shorter than a predetermined time limit; a second monitoring step of monitoring a second electric energy supplied from the system 104 per predetermined time limit; a calculation step of obtaining a change over time in the first electric energy; and an instruction step of instructing the storage battery to discharge electric power to supply a load 108 located in the consumer site in accordance with the change over time in the first electric energy and with a peak value in the past pertaining to the second electric energy.

A DC-DC converter wherein a series reactor and primary-side terminals of a transformer are connected between output terminals of a full-bridge inverter in which each of an upper arm and a lower arm includes a switching element and a freewheel diode, and a rectifier circuit and a filter circuit are connected to secondary-side terminals of the transformer. The DC-DC converter includes a circulation current generation mode in which a circulation current flowing between the transformer and the switching element is generated in a power non-transmission period, and a circulation current interruption mode in which the circulation current is interrupted.

Systems and methods relating to zero voltage switching for inverters. A full bridge inverter is used in conjunction with a passive auxiliary circuit and an output filter. A control system controls the current by way of the auxiliary circuit and injects a high quality current to a power grid. The control system adjusts the duty ratio and switching frequency of the gate pulses applied to the power semiconductors in the full-bridge inverter. As well, the control system adjusts the phase shift between gate pulses for both the leading leg and lagging leg power semiconductors to control the current passing through the auxiliary circuit.

Approaches for controlling power supplied to an electric grid are disclosed. In embodiments, methods and systems control power supplied to an electric grid using an energy storage device. In an embodiment, a method receives an indication of power to be supplied to the electric grid, generates power from a power generator and adjusts, using the generated power, an energy level of the energy storage device to control power supplied to the grid in accordance with the received indication. In another embodiment, a system comprises a grid indication receiver for receiving an indication of power to be supplied to the electric grid; a power generator connected to the grid; an energy storage device coupled to the power generator; and a controller for adjusting, using the generated power from the generator, an energy level of the energy storage device to control power supplied to the grid in accordance with the received indication.

A system for a direct current (DC) to DC converter, the system comprising one or more transformers, a bridge driver connected to a primary side of the one or more transformers, a first bridge rectifier connected to a secondary side of the one or more transformers, a second bridge rectifier connected to a secondary side of the one or more transformers, and one or more secondary configuration switches operable to configure the first bridge rectifier and the second bridge rectifier into each of a single rectifier configuration, a parallel rectifier configuration, and a series rectifier configuration.

A system for a direct current (DC) to DC converter, the system comprising one or more transformers, a bridge driver connected to a primary side of the one or more transformers, a first bridge rectifier connected to a secondary side of the one or more transformers, a second bridge rectifier connected to a secondary side of the one or more transformers, and one or more secondary configuration switches operable to configure the first bridge rectifier and the second bridge rectifier into each of a single rectifier configuration, a parallel rectifier configuration, and a series rectifier configuration.

A power conversion device included in a self-excited DC power transmission system connected to an AC system includes a self-excited converter and a control device. The control device includes: a storage to store first vibration information and a first control parameter of the self-excited converter in association with each other for each of a plurality of pieces of first vibration information, a vibration detector to detect a vibration component of an AC voltage of the AC system; a determination unit to determine whether first similar vibration information similar to first detected vibration information including the vibration component of the AC voltage of the detected AC system exists in the plurality of pieces of first vibration information; and a setting unit to set the first control parameter associated with the first similar vibration information as a new control parameter of the self-excited converter when the first similar vibration information exists.

A configurational structure of a unidirectional/bidirectional AC/DC power supply includes: a case, having a first lateral wall and a second lateral wall at two transverse sides thereof and defining a front wall and a back wall at two longitudinal sides thereof; a first bus unit, being installed in the case and against the first lateral wall; a power factor correction (PFC) unit, being installed in the case and close to the front wall; three power module units, being installed abreast in the case, the power module units and located between the PFC unit and the back wall; a second bus unit, being installed on the back wall; and a control system unit, being installed in the case and against the second lateral wall. Thereby, with the sophisticated configuration and layout formed among the components, the resulting power supply has reduced distortion, enhanced performance, and improved efficiency.