A control method and device of a voltage converter and a voltage control system are provided. In some embodiments, the control device includes a first control module configured to obtain a current reference value according to an output voltage of a voltage converter and a given voltage value; a current modulation module configured to reduce the current reference value when an output current of a voltage converter is greater than a first current threshold; and a second control module configured to control the output current of a voltage converter according to the reduced current reference value and an output current.

In some implementations, there is provided an apparatus comprising a resonant amplifier circuit including a first inductor having a first inductive input and a first inductive output; a second inductor having a second inductive input and a second inductive output; a first switch coupled to the first inductive output; and a second switch coupled to the second inductive output, wherein the first switch and the second switched are driven out of phase, wherein the first inductor is configured to be resonant with a first capacitance associated with the first switch, and wherein the second inductor is configured to be resonant with a second capacitance associated with the second switch. Related systems and articles of manufacture are also provided.

The present disclosure relates to a motor assembly, and more particularly, to a motor having a two-phase input power source and a power conversion device for driving a two-phase motor. The present disclosure relates to the motor assembly for driving the two-phase motor, the motor assembly configured to comprise: a motor including a first winding and a second winding having an electrically insulated parallel structure; a DC-link circuit for supplying a direct-current voltage; and an inverter connected to the DC-link circuit to convert the direct-current voltage into an alternating-current voltage to drive the motor, and including a first switching element set connected to the first winding and a second switching element set connected to the second winding.

A power control apparatus, comprising: a first wiring and a second wiring connected to a power source; a first capacitor connected to the first wiring and the second wiring; an electrical component including a plurality of switches connected in parallel with the first capacitor through the first wiring and the second wiring; and a second capacitor which is connected to one of the first wiring and the second wiring and is connected to a reference potential portion having a constant potential, wherein an impedance of a first conducting path between another side connection point, which is connected to the first capacitor, of the other one of the first wiring and the second wiring and the power supply not through the first capacitor, is higher than an impedance of a second conducting path between the another side connection point and the second capacitor through the first capacitor.

Method for operating an apparatus for wirelessly transferring energy in the direction of an electrical consumer by means of inductive coupling, wherein the apparatus comprises: a rectifier for generating a DC voltage from a power supply system voltage, an inverter fed from the DC voltage and configured to generate a pulse-width-modulated drive signal, and a coil driven by means of the pulse-width-modulated drive signal, by means of which coil an alternating magnetic field is generatable for the purpose of transferring the energy, wherein the method comprises the following steps: controlling an electrical actual power output by the inverter to a predefinable electrical target power, wherein a frequency and a duty cycle of the pulse-width-modulated drive signal serve as manipulated variables of the control, wherein the following steps are carried out for the purpose of adjustment to the target power: a) setting a start frequency (f_0), b) setting a start duty cycle (DC_1) in such a way that the target power is undershot, c) measuring an electrical actual power output by the inverter in the case of the start frequency (f_0) set and the start duty cycle (DC_1) set, d) choosing an adjustment target power which is less than or equal to the target power, e) calculating a duty cycle (DC_2) which computationally corresponds to the adjustment target power, f) setting the calculated duty cycle (DC_2), g) measuring an electrical actual power output by the inverter in the case of the frequency (f_0) set and the duty cycle (DC_2) set, and h) repeating steps d) to g) with increasing adjustment target power until a deviation between the target power and the actual power falls below a predefined threshold.

An apparatus for defining an AC power source having a predetermined amperage rating and for use with a pallet truck or fork lift lifting device. The apparatus includes a pair of terminal banks, a battery, a converter adapted to change DC to AC power, a relay, a controller, and a base adapted for engagement by the lifting device for transport of the apparatus. The apparatus is shaped so that it can be transported by the lifting device through a doorway. A pair of terminal banks, battery, converter, relay and controller are coupled to one another and configured for selective operation in a standalone configuration or a stacked configuration.

An apparatus for defining an AC power source having a predetermined amperage rating and for use with a pallet truck or fork lift lifting device. The apparatus includes a pair of terminal banks, a battery, a converter adapted to change DC to AC power, a relay, a controller, and a base adapted for engagement by the lifting device for transport of the apparatus. The apparatus is shaped so that it can be transported by the lifting device through a doorway. A pair of terminal banks, battery, converter, relay and controller are coupled to one another and configured for selective operation in a standalone configuration or a stacked configuration.

An apparatus includes a DC-to-AC converter comprising a first output terminal and a second output terminal. The apparatus also includes a DC-to-DC converter comprising a third output. The DC-to-AC converter is configured to receive a DC input voltage from a DC power source, and to produce a first alternating output voltage at the first output terminal, and a second alternating output voltage at the second output terminal. The DC-to-DC converter is configured receive a DC input voltage from the DC power source, and to step down the DC input voltage at the third output.

A method and apparatus for providing welding-type power is disclosed. It includes an input circuit, a dc bus, an output circuit, and a control module. The input circuit receives power and provides an intermediate signal to the bus. The output circuit receives the dc bus and provides an ac welding-type output. The output circuit includes a half-bridge output inverter with at least first and second switches. The output inverter further includes an output control circuit. The output control circuit provides freewheeling paths that includes control switches, the output, antiparallel diodes. The control module has a four quadrant control module that provides control signals to the half bridge output inverter and provides modulating control signals to the first and second output control switches. The modulating signals cause the output control switches to be turned on and off multiple times to control a rate of change of output current.

A method and apparatus for providing welding-type power is disclosed. It includes an input circuit, a dc bus, an output circuit, and a control module. The input circuit receives power and provides an intermediate signal to the bus. The output circuit receives the dc bus and provides an ac welding-type output. The output circuit includes a half-bridge output inverter with at least first and second switches. The output inverter further includes an output control circuit. The output control circuit provides freewheeling paths that includes control switches, the output, antiparallel diodes. The control module has a four quadrant control module that provides control signals to the half bridge output inverter and provides modulating control signals to the first and second output control switches. The modulating signals cause the output control switches to be turned on and off multiple times to control a rate of change of output current.