Multi-output power converter with phase-shift control

Patent metadata

Field	Value
Publication number	US-2017005584-A1
Application number	US-201415107429-A
Country	US
Kind code	A1
Filing date	Dec 29, 2014
Priority date	Dec 31, 2013
Publication date	Jan 5, 2017
Grant date	—

Abstract

A multi-output power conversion circuit employing phase-shift control, receiving at the input a DC voltage and supplying at the output a plurality of modulatable DC voltages, the circuit comprises a transformer having an input and a plurality of outputs, the input being connected to an inverter including at least two switches and configured to convert a DC voltage into an AC voltage and each output being connected to a controlled rectifier configured to convert an AC voltage into a DC voltage, each controlled rectifier including a magnetic storage inductance connected to an AC to DC converter including at least two switches, the power conversion circuit further including a control module configured to generate phase-shifted control signals adapted to control the switching of the switches of the inverter and the controlled rectifiers.

First claim

1 . A multi-output power conversion circuit employing phase-shift control receiving at the input a DC voltage and supplying at the output a plurality of modulatable DC voltages, said conversion circuit including a transformer having an input and a plurality of outputs, said input being connected to an inverter including at least two switches and configured to convert a DC voltage into an AC voltage and each output being connected to a controlled rectifier configured to convert an AC voltage into a DC voltage, each controlled rectifier including a magnetic storage inductance connected to an AC to DC converter including at least two switches, the power conversion circuit further including a control module configured to generate phase-shifted control signals adapted to control the switching of the switches of the inverter and the controlled rectifiers, said conversion circuit wherein said control module is also configured to vary the phase shift between the control signals of the power switches of the inverter and those of each controlled rectifier in order to adjust the amplitude of the output voltages of the controlled rectifiers independently of one another.

2 . The circuit as claimed in claim 1 wherein the input of the transformer is not connected to a magnetic storage inductance in order to have outputs totally independent of one another.

3 . The circuit as claimed in claim 1 wherein the inverter is produced with a capacitive half-bridge structure.

4 . The circuit as claimed in claim 1 wherein the inverter is produced with a full bridge structure.

5 . The circuit as claimed in claim 1 wherein at least one controlled rectifier is produced with a capacitive half-bridge structure.

6 . The circuit as claimed in claim 1 wherein at least one controlled rectifier is produced with a full bridge structure.

7 . The circuit as claimed in claim 1 wherein the regulation unit of at least one controlled rectifier has an input to which is applied a signal making it possible to form the phase shift between the control signals of the switches of the inverter and those of said controlled rectifier.

8 . The circuit as claimed in claim 1 wherein at least one secondary controlled circuit includes a filter capacitance.

9 . A multi-voltage electrical network comprising a multi-output power conversion circuit employing phase-shift control as claimed in claim 1 and at least one DC voltage source, said conversion circuit being connected at its input to said voltage source and supplying at the terminals of its various outputs the various voltages of the network.

10 . A method of manufacturing a multi-output power conversion circuit employing phase-shift control as claimed claim 1 comprising a step of designing said circuit including a step of optimizing the value of a magnetic storage inductance, said dimensioning step including:
a step of defining a phase-shift range for which the output current of said conversion circuit is a substantially linear function of the phase shift,
a step of reducing the width of said phase-shift range to reduce the current in the switches on switching the latter to a value close to zero,
a step of estimating the value of the inductance L from the phase-shift range.

Assignees

• Thales Sa

Inventors

• Guepratte Kevin
• Stephan Hervé

Classifications

• H02M3/33561 Primary

  having more than one ouput with independent control · CPC title

• H02M3/335

  using semiconductor devices only · CPC title

• H02M3/33584

  Bidirectional converters · CPC title

• H02M3/33523

  with galvanic isolation between input and output of both the power stage and the feedback loop · CPC title

• H02M3/1586

  switched with a phase shift, i.e. interleaved · CPC title