Rectifying circuit and method for an unbalanced two phase DC grid
AssigneeKoninklijke Philips N.V.
InventorsEberhard Waffenschmidt, Ulrich Boeke
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Abstract
The present invention relates to a rectifying method and circuit using a magnetically coupled double flyback converter. The main circuit can consist of only one transformer, two switches, two low frequency diodes, two high frequency diodes and two capacitors, so that power is inherently distributed according to the demand on the two DC phases and a sinusoidal grid current can be obtained without sophisticated control.
Claims9
A rectifying circuit for providing an interface between an alternating current supply grid and a direct current grid, said circuit comprising:
- a transformer having a first and second primary windings and first and second secondary windings;
- a first half-wave rectifier for outputting positive half-waves of an AC signal supplied from said AC supply grid;
- a second half-wave rectifier for outputting negative half-waves of said AC signal;
- a first controlled switch for continuously switching on and off supply of said positive half-waves to said first primary winding during each of said positive half-waves;
- a second controlled switch for continuously switching on and off supply of said negative half-waves to said second primary winding during each of said negative half-waves;
- a first rectifier circuit connected to said first secondary winding of said transformer for generating a first DC output voltage based on a discharge current of said transformer during a switched-off state of said first and second controlled switches;
- and
- a second rectifier circuit connected to said second secondary winding of said transformer for generating a second DC output voltage based on a discharge current of said transformer during said switched-off state of said first and second controlled switches.
A method of providing an interface between an alternating current supply grid and a direct current grid, said method comprising the steps of:
- rectifying an AC signal supplied from said AC supply grid to generate positive half-waves of said AC signal;
- rectifying said AC signal to generate negative half-waves of said AC signal;
- continuously switching on and off supply of said positive half-waves to a first primary winding of a transformer during each of said positive half-waves;
- continuously switching on and off supply of said negative half-waves to a second primary winding of said transformer during each of said negative half-waves;
- generating a first DC output voltage based on a discharge current in a first secondary winding of said transformer during a switched-off supply state of said positive and negative half-waves;
- and
- generating a second DC output voltage based on a discharge current in a second secondary winding of said transformer during a switched-off supply state of said positive and negative half-waves.
Dependencies are inferred from the claim text.