13 results about "DC-to-DC converter" patented technology

A system includes: an alternating current (AC) to direct current (DC) converter (AC-DC converter), the AC-DC converter connectable to a line voltage; and a DC to DC converter (DC-DC converter) connected to the AC-DC converter, the DC-DC converter including: a high voltage buck-boost converter having a secondary side connectable to a high voltage battery; a low voltage buck-boost converter having a secondary side connectable to a low voltage battery; and one or more transformers having a primary side connected to the AC-DC converter, a secondary side connected to a primary side of the high voltage buck-boost converter, and a tertiary side connected to a primary side of the low voltage buck-boost converter.

Discussed is a power control apparatus and a power control method. The power control apparatus may monitor an output power of a power conversion system (PCS), detect changes in a voltage of a DC link, and control output power of a battery by comparing the output power of the PCS with a rated power of the battery, and thus, provides stabilization of an energy storage system by preventing voltage fluctuations in the DC link.

　The invention relates to an LLC DC-DC converter for use in a micro-inverter system, which is capable of providing a double or quadruple gain of voltage. The LLC DC-DC converter comprises: a full-bridge circuit; a resonant transformer having a primary winding on one end thereof, and secondary and tertiary windings on the other end, wherein the start of said primary winding is connected to the output of said full-bridge circuit; a rectifier circuit connected to said other end of the resonant transformer; and two tapping switches connected to a DC-AC inverter in a way such that when the first tapping switch is turned on, the LLC DC-DC converter provides a double gain of voltage, and when the second tapping switch is turned on, the LLC DC-DC converter provides a quadruple gain of voltage.

A method for operating a bidirectional DC-DC converter is provided. The bidirectional DC-DC converter can transfer energy both from a high-voltage network to a low-voltage battery and from the low-voltage battery to the high-voltage network. The bidirectional DC-DC converter comprises a first power stage with an LLC converter circuit and a second power stage with two cascaded buck converters. The two cascaded buck converters are controlled by a single PWM with the same duty cycle. The method includes operating the DC-DC converter in a buck mode, switching from buck mode to boost mode, and operating the DC-DC converter in a boost mode.The operation of the DC-DC converter in step-down mode and step-up mode includes the operation of the LLC converter circuit in open-loop operation at a resonant switching frequency and the operation of the two cascaded step-down converters using the same duty cycle.

A bi-directional DC-DC converter and an on-board charger with the bi-directional DC-DC converter integrated into it are disclosed for converting a first voltage to a second voltage. The bi-directional DC-DC converter includes a transformer for magnetically coupling a primary circuit receiving the first voltage on a primary side with a rectification circuit on a secondary side. Further, a high voltage power source is connected to the rectification circuit for supplying a high voltage to one or more high voltage loads and a low voltage power source is connected to the high voltage power source through a secondary circuit for supplying a second voltage to one or more low voltage loads. The bi-directional DC-DC converter functions in both stationary condition and running condition of a powered device.

Example DC-to-DC converters are described herein. An example DC-to-DC converter includes an input connected in series with an output. The input is to be connected to a voltage source and the output is to be connected to a load. The DC-to-DC converter also includes a first switch connected in series with the input and the output, a second switch connected in parallel with the output, a first current sense transformer connected in series the first switch, a second current sense transformer connected in series with the second switch, and a switching controller to determine an estimated output current at the output based on the measurements from the first and second current sense transformers.

To provide a stationary electromagnetic apparatus having a winding structure capable of setting a wide range of leakage inductance without applying special structures and methods.SOLUTION: In a stationary electromagnetic apparatus, first primary winding 11 and first secondary winding 21 are arranged to overlap each other while maintaining a certain distance across a spacer 7, on a first magnetic leg 2a of a single-phase iron core 2 obtained by molding a magnetic material into a ring shape, and second primary winding 12 and second secondary winding 22 are arranged side-by-side while maintaining a certain distance across a spacer 8 in a center axis B1 direction on a second magnetic leg. The first primary winding 11 and the second primary winding 12 are connected in series by connection means 11a, and the first secondary winding 21 and the second secondary winding 22 are connected in series by connection means 21a.SELECTED DRAWING: Figure 1

A hybrid sensing circuit for generating a control signal for controlling a switching direct-current-to-direct-current (DC-to-DC) converter where (i) the switching DC-to-DC converter includes a first inductor-capacitor (LC) filter and (ii) a second LC filter is electrically coupled between a local output node and a remote output node of the switching DC-to-DC converter. The hybrid sensing circuit includes (a) one or more first amplifiers configured to generate a first amplifier output signal proportional to a dynamic voltage at the local output node, (b) one or more second amplifiers configured to generate a second amplifier output signal proportional to a difference between (i) a desired output voltage of the switching DC-to-DC converter and (ii) an output voltage of the switching DC-to-DC converter at the remote output node, and (c) summing circuitry configured to generate a control signal based on a sum of the first and second amplifier output signals.

A bidirectional direct current-to-direct current (DC-DC) converter includes a converter (500), which can be operated as a boost or buck converter, and a control unit. The converter (500) consists of a set of inductors (L1, L2), a set of capacitors (C1, C2), and a set of switches (GS1-GS5). The control unit can be configured to activate the converter (500) as boost converter by turning ON first switches (GS2, GS3) of the set of switches and turning OFF remaining second switches (GS1, GS4, GS5) of the set of switches. The control unit can be configured to activate the converter as the buck converter by turning OFF the first switches (GS2, GS3) and turning ON (GS1, GS4, GS5) the remaining second switches.

A reverse current detection circuit and a DC-DC converter. The reverse current detection circuit is coupled to a synchronous rectification transistor and detects a reverse current based on a voltage across the coupled synchronous rectification transistor, wherein the reverse current detection circuit includes a first stage differential input circuit having a first transistor, a first resistor, a second transistor, and a second resistor, and a second stage differential input circuit having a third transistor and a fourth transistor, the first stage differential input circuit further having a fifth transistor including a drain connected to an opposite end of the first resistor relative to an end connected to the first transistor and being of a same conductivity type as the synchronous rectification transistor.

A method for operating a DC-to-DC converter with a primary full-bridge rectifier and a secondary synchronous rectifier for a motor vehicle includes detecting an input voltage of the synchronous rectifier, an output voltage of the synchronous rectifier, and an output power of the synchronous rectifier; determining a switch event with a falling signal edge per switch element of the DC-to-DC converter and a switch element of the synchronous rectifier; ascertaining a delay of the falling signal edge of the switch element of the synchronous rectifier using the input voltage, the output voltage, and the output power; and outputting a control signal in order to shift the signal edge of the switch element of the synchronous rectifier according to the delay.

A DC-DC converter is provided, including a phase-shift full-bridge circuit, a primary side resonance circuit, a transformer, a secondary side resonance circuit and a rectification circuit that are connected in sequence, and a processor. The phase-shift full-bridge circuit is configured to convert a direct-current power output from the direct-current power supply to an alternating-current power. The rectification circuit is configured to rectify the alternating-current power output from the transformer, to output power to the load. The processor is configured to control the phase-shift full-bridge circuit to convert the direct-current power output from the direct-current power supply, and control an output power of the phase-shift full-bridge circuit; and the secondary side resonance circuit is configured to resonate in a case that a direction of a current through the transformer changes, to store energy and discharge accordingly, to supply power to the load.

A high power density DC-to-DC converter has a high efficiency and a bidirectional or a unidirectional universal configuration. The high power density DC-to-DC converter can be housed in a compactly-arranged converter enclosure. A plurality of the high power density DC-to-DC converters can be configured with converter input connections to a plurality of high power renewable energy sources. The converter outputs for all of the plurality of the high power density DC-to-DC converters can be connected to a DC inverter input of one or more DC-to-AC inverters with each of the inverters having an AC inverter output connected to an electrical grid.