Symmetric 270V DC Power Supply of a Universal Power Converter for Airborne Applications

Tesina final de máster feta en col.laboració amb Polytechnic Institute of New York UniversityThe trend of the last years in the aeronautic industry is to reduce the weight of the commercial aircrafts. This weight reduction implies the need for more electrical power on board, since the heavy hydraulic drive system is replaced by and an electromechanical system. In order to supply this amount of extra electrical power, a Symmetric 270V DC Power Supply as a part of a Universal Power Converter is presented in this thesis. The Universal Power Converter generates the di erent airborne voltages - 32VDC, 270V DC and 230V AC- using as Fuel Cell Stack as raw energy supply. The thesis focus on the the power conditioning system includes three DC-DC converters, generating regulated 270V DC output. The rst stage, a 3-phase interleaved full-bridge soft-switching converter, so called V6, boosts the Fuel cell voltages to a non regulated DC-Link bus with a voltage between the 320 and 580 Volts. The following stage, composed of a SEPIC converter and C uk converter parallel connected and in interleaving operation provide the regulated output. The three converters of the proposed conditioning system has been studied obtaining the design equations, sized the components and then veri ed with computer simulations using Matlab Simulink. The simulation results show regulation in the entire range of load with and excellent result within the Continuous Conduction Mode of the converter, a high performance of 93% at full load and a small current ripple at the Fuel Cell input, less than 17% peak-to-peak of the drawn current at full load. Furthermore, this thesis presents the Universal Power Converter at system level, to place the reader in context. The system supplied with a 16kW Proton Membrane Fuel Cell is designed to generate di erent outputs: 32Vdc at 5kW, 270Vdc at 16kW and 230Vac at 16kW; supplying at a time three, two or one voltage. Furthermore, the selected Fuel Cell is introduced and a Simulink model is build to perform simulations of th econverters

Symmetric 270V DC Power Supply of a Universal Power Converter for Airborne Applications

Tesina final de máster feta en col.laboració amb Polytechnic Institute of New York UniversityThe trend of the last years in the aeronautic industry is to reduce the weight of the commercial aircrafts. This weight reduction implies the need for more electrical power on board, since the heavy hydraulic drive system is replaced by and an electromechanical system. In order to supply this amount of extra electrical power, a Symmetric 270V DC Power Supply as a part of a Universal Power Converter is presented in this thesis. The Universal Power Converter generates the di erent airborne voltages - 32VDC, 270V DC and 230V AC- using as Fuel Cell Stack as raw energy supply. The thesis focus on the the power conditioning system includes three DC-DC converters, generating regulated 270V DC output. The rst stage, a 3-phase interleaved full-bridge soft-switching converter, so called V6, boosts the Fuel cell voltages to a non regulated DC-Link bus with a voltage between the 320 and 580 Volts. The following stage, composed of a SEPIC converter and C uk converter parallel connected and in interleaving operation provide the regulated output. The three converters of the proposed conditioning system has been studied obtaining the design equations, sized the components and then veri ed with computer simulations using Matlab Simulink. The simulation results show regulation in the entire range of load with and excellent result within the Continuous Conduction Mode of the converter, a high performance of 93% at full load and a small current ripple at the Fuel Cell input, less than 17% peak-to-peak of the drawn current at full load. Furthermore, this thesis presents the Universal Power Converter at system level, to place the reader in context. The system supplied with a 16kW Proton Membrane Fuel Cell is designed to generate di erent outputs: 32Vdc at 5kW, 270Vdc at 16kW and 230Vac at 16kW; supplying at a time three, two or one voltage. Furthermore, the selected Fuel Cell is introduced and a Simulink model is build to perform simulations of th econverters

Symmetric 270V DC Power Supply of a Universal Power Converter for Airborne Applications

Tesina final de máster feta en col.laboració amb Polytechnic Institute of New York UniversityThe trend of the last years in the aeronautic industry is to reduce the weight of the commercial aircrafts. This weight reduction implies the need for more electrical power on board, since the heavy hydraulic drive system is replaced by and an electromechanical system. In order to supply this amount of extra electrical power, a Symmetric 270V DC Power Supply as a part of a Universal Power Converter is presented in this thesis. The Universal Power Converter generates the di erent airborne voltages - 32VDC, 270V DC and 230V AC- using as Fuel Cell Stack as raw energy supply. The thesis focus on the the power conditioning system includes three DC-DC converters, generating regulated 270V DC output. The rst stage, a 3-phase interleaved full-bridge soft-switching converter, so called V6, boosts the Fuel cell voltages to a non regulated DC-Link bus with a voltage between the 320 and 580 Volts. The following stage, composed of a SEPIC converter and C uk converter parallel connected and in interleaving operation provide the regulated output. The three converters of the proposed conditioning system has been studied obtaining the design equations, sized the components and then veri ed with computer simulations using Matlab Simulink. The simulation results show regulation in the entire range of load with and excellent result within the Continuous Conduction Mode of the converter, a high performance of 93% at full load and a small current ripple at the Fuel Cell input, less than 17% peak-to-peak of the drawn current at full load. Furthermore, this thesis presents the Universal Power Converter at system level, to place the reader in context. The system supplied with a 16kW Proton Membrane Fuel Cell is designed to generate di erent outputs: 32Vdc at 5kW, 270Vdc at 16kW and 230Vac at 16kW; supplying at a time three, two or one voltage. Furthermore, the selected Fuel Cell is introduced and a Simulink model is build to perform simulations of th econverters

Light emitting diode driver with differential voltage supply

The current invention relates to a driver for driving one or a plurality of LEDs (D1, D2), comprising at least one driving unit (201, 202) adapted to be supplied with a differential voltage, between one first bias voltage (VB1) and one second bias voltage (VB2), the differential voltage being adapted to be equal or larger than the largest expected variations ([Delta]VF) of the forward voltage of said one or a plurality of LEDs (D1, D2). Another aspect of the invention relates to an integrated package comprising at least an LED and associated driving unit (201, 202). Another aspect of the invention relates to a light module comprising a plurality of LEDs (D1, D2) and associated driving units (201, 202)

Driver circuit with extended operation range

A system comprising a driver circuit wherein the driver circuit comprises a converter. The system further comprises a controller operable to control a ratio between an input voltage supplied to the driver circuit and a target output voltage to be output from the driver circuit by varying a pulse width modulated signal, and by switching between operating modes of said converter. The controller is configured to determine that the driver circuit is operating in an undesired state caused by a combination of the duty cycle and the operating mode of the converter. The system further comprises a resistance adjustment circuit configured to adjust an equivalent output resistance of the driver circuit in response to the controller determining that the driver circuit is operating in an undesired state

Compact power conversion device with continuous output regulating range

The current invention relates to a power conversion device(10), for supplying a load (11) with a PWM signal through an inductive output filter (105),the power conversion device(10) being characterized in that it comprises: a power conversion module(101) supplied by a DC input voltage(Vin) and configured for providing a plurality of output signals(PWM1, ...,PWMn) having a level amplitude that is a fraction of the input voltage (Vin) level, each output signal being floating with a bias component equally split in a plurality of steps ranging from a determined lowest fraction level amplitude to a determined highest fraction level amplitude;; a multiplexer (103) receiving as a plurality of inputs said plurality of output signals(PWM1, ..., PWMn) and configured for outputting one output signal(PWMx) selected from said plurality of inputs,the output signal(PWMx) of the multiplexer(103) being connected to the output filter (105)

On the modeling of switched capacitor converters with multiple outputs

The internal nodes of switched capacitor converters can be used to provide multiple pulsed width modulated voltages that, in combination with filter inductors, can extend the available dc outputs. Such converter architecture requires models that accurately predict the behaviour of switched capacitor converters operated in current output mode. Based on the well-known output impedance model, a new circuit representation is proposed for converters with multiple current-loaded outputs. A characterization methodology is developed to determine the parameters of said model. Predictions of the new model compare favorably to circuit simulations and experimental measurements

Compact driver, notably for a light emitting diode, having an integrated dual output

The current invention relates to a LED driver (10) for driving at least two LED strings (131, 133) comprising: a dual output power converter (103) for converting an input voltage (Vin) into two different output voltages for driving two sets of said at least two LED strings (131, 133), a controller (107) for controlling the dual output power converter (103) based on at least one input set point, the dual output converter (103) comprising a switched capacitor converter comprising a plurality of switches, a plurality of capacitors, the outputs of the dual output power converter (103) being connected to internal nodes of the dual power converter (103), the controller (107) being further adapted to deliver PWM output control signals for driving the switches, the duty cycle of which being a function of said at least one input set point. The invention also relates to a lighting system (1) comprising such a driver (10)

Compact driver, notably for a light emitting diode, having an auxiliary output

The current invention relates to a driver(10,20) for driving at least one main load and one auxiliary load comprising: ä power converter(101) adapted to convert an input voltage(Vin) into at least one main output voltage provided through a main output(1011) for driving said main load, and at least one auxiliary output DC voltage through an auxiliary output(1013) for supplying said auxiliary load, ä controller(103)adapted to control the main output based on at least one input set point, wherein the power converter(101)comprises a switched capacitor converter comprising a plurality of switches and a plurality of capacitors, the main output(1011)being connected to at least one internal node of the power converter (101), the auxiliary output(1013) being connected to a DC node of the power converter(101)