A DC-DC converter includes: a first converter including a pass transistor coupled between the first node and a first output, and a body diode connected in parallel to the pass transistor; a sensor coupled between both ends of the pass transistor and which detects a driving current; and a second converter which outputs a second power voltage lower than the first power voltage to a second output. The second converter includes a master inverting converter which outputs the second power voltage independently of the driving current, a slave inverting converter which outputs the second power voltage when the driving current is greater than a predetermined threshold or when the input power voltage is greater than a predetermined boosting voltage limit, and an inverting converter controller which controls operations of the master and slave inverting converters in first and second drive modes based on the driving current and the input power voltage.

A light emitting load driving device includes a plurality of constant current sources structured to be serially connected to a plurality of light emitting loads connected in parallel respectively, and structured to control a current flowing through the plurality of light emitting loads connected in parallel; a plurality of load connection terminals structured to be connected to the plurality of light emitting loads connected in parallel and the plurality of constant current sources respectively; a control circuit structured to be controlled based on a plurality of terminal voltage applied to the plurality of load connection terminals and a reference voltage, and structured to control a voltage output portion generating an output voltage provided to the plurality of light emitting loads connected in parallel so that both of a lowest terminal voltage applied to the plurality of load connection terminals and the reference voltage are equalized with respect to each other.

A switching power converter circuit comprises an inductor arranged to receive input energy from an input circuit node; a switch circuit coupled to the inductor; a load current sensing circuit element coupled to a regulated circuit node and an output circuit node; a compensation circuit coupled to a compensation circuit node; a control circuit coupled to the compensation circuit node and the switch circuit, the control circuit configured to modulate activation of the switch circuit to regulate a voltage at the regulated circuit node; and a feedforward circuit coupled to the load current sensing circuit element and the compensation circuit, and configured to adjust modulation of the switch circuit according to sensed load current.

A converter that makes it possible to selectively switch between various converter architectures that are capable of supplying different output voltages on the basis of one and the same input voltage. The various architectures share at least some electronic components with one another, thereby decreasing the production cost of the converter according to the invention. The converter is particularly advantageous for lighting modules for motor vehicles, in which there are substantial space constraints but in which wide output-voltage ranges are required to be able to supply a varied and substantial number of electroluminescent light sources (LEDs) with power.

A wind turbine system includes a wind turbine and switching devices. Each switching device is for stabilizing an electric output of a coil of the wind turbine, and includes a voltage converter circuit, a switch circuit electrically connected between the voltage converter circuit and an output interface, and a controller circuit. The controller circuit is configured to calculate an input electric power of input electricity into the voltage converter circuit, to calculate an output electric power of output electricity outputted by the voltage converter circuit, and to control the switch circuit to operate in one of a closed state and an open state according to the input electric power and the output electric power.

A power converter apparatus includes: a pair of input terminals and a pair of output terminals; a first series circuit including a first inductor and a first switch element and being connected in parallel to the pair of input terminals; a switching circuit that switches, by using a second switch element, a voltage between both ends of the first switch element; a power converter circuit that converts an input voltage inputted to the pair of input terminals to a predetermined output voltage and then outputs the output voltage to the pair of output terminals; and a ripple cancellation current generator circuit that, in case of the first switch element being turned on and off, generates a ripple cancellation current for cancelling a ripple current generated by accumulation and discharge of current energy to and from the first inductor.

A DC/DC converter is provided which can be produce easily and inexpensively with an alternating current component with which a superimposed direct current is reduced in an output voltage (ripple). A C+DC/DC converter includes an input and output, a series arm which is arranged between the input and the output and in which at least one first inductor and first capacitor are arranged, and a capacitor arranged in a first shunt arm at the output. A second shunt arm arranged parallel to the first shunt arm is equipped with a first switch and a second switch arranged in series and a second inductor such that the first connection of the inductor is connected to a point between the first inductor and the first capacitor and the second connection of the inductor is connected to a point between the first and the second switch.

An electronic charger for electric power distribution installations is provided. The electronic charger includes a DC/DC converter of the SEPIC type including an input stage, an output stage and a coupling capacitor. The input stage is electrically connected with input terminals and includes an input inductor and a switching device. The output stage is electrically connected with output terminals and includes an output inductor, an output capacitor and a blocking device. The coupling capacitor is configured to electrically couple the input stage and the output stage with a capacitive coupling. A first sensor provides a first sensing signal indicative of a charging current. A first controller receives the first sensing signal and a reference signal and provides a driving signal to control the switching device.

A system includes a two-conductor loop in which the loop current or current signal is controlled by a loop current controller to be proportional to a signal output from a sensor. The system further includes energy harvesting circuitry in electrical connection with the two-conductor loop which includes a second current controller in parallel electrical connection with the loop current controller and a power converter in electrical connection with the second current controller. The second current controls a portion of current drawn from the two-conductor loop and delivered to the power converter from an output port thereof. The portion of the current drawn from the two-conductor loop is returned to the loop current controller from the energy harvesting circuit. Noise in the portion of the current drawn from the two-conductor loop by the second current controller is controlled by the second current controller to be below a predetermined threshold.

An Uninterruptible Power Supply (UPS) including an input configured to receive input AC power, a backup power input configured to receive backup DC power having a first voltage level from a backup power source, a converter configured to convert the input AC power from the input and the backup DC power from the backup power input into DC power having a second voltage level, the converter including an input selection circuit configured to selectively couple the converter to the input and the backup power input, an inductor, a first converter switch configured to couple a first end of the inductor to a neutral connection, and a second converter switch configured to couple a second end of the inductor to the backup power input via the input selection circuit.