Method For Operating A Power Converter In A Soft-Switching Range
First Claim
1. Method for converting a first DC voltage to a second DC voltage, the method comprising:
- converting the first DC voltage to a first AC voltage using a first bridge circuit comprising a first number of switches;
transforming the first AC voltage to a second AC voltage;
converting the second AC voltage to the second DC voltage using a second bridge circuit comprising a second number of switches;
wherein the method further comprises;
controlling a phase shift between a phase of the first and the second AC voltage; and
controlling a duty cycle of at least one of the first and the second AC voltage such that the switches of said first and second bridge circuits are soft-switched.
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Abstract
For converting a first DC voltage to a second DC voltage, a first bridge circuit comprised in a power converter is controlled to convert the first DC voltage to a first AC voltage. The first AC voltage is transformed to a second and possibly further AC voltage. The second and each possibly further AC voltage is converted to a DC voltage by respective bridge circuits. To increase efficiency of the power converter switches of the power converter are controlled to operate in soft switching. Thereto a duty cycle of each AC voltage is controlled. In an embodiment, a half-cycle voltage-time integral of each AC voltage is controlled to be substantially equal.
39 Citations
15 Claims
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1. Method for converting a first DC voltage to a second DC voltage, the method comprising:
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converting the first DC voltage to a first AC voltage using a first bridge circuit comprising a first number of switches; transforming the first AC voltage to a second AC voltage; converting the second AC voltage to the second DC voltage using a second bridge circuit comprising a second number of switches; wherein the method further comprises; controlling a phase shift between a phase of the first and the second AC voltage; and controlling a duty cycle of at least one of the first and the second AC voltage such that the switches of said first and second bridge circuits are soft-switched. - View Dependent Claims (2, 3, 15)
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4. Method for operating a DC/DC power converter in a soft-switching range for exchanging power between a number of devices, the number of devices at least comprising a power source and a load,
the power converter comprising a transformer, the transformer having at least two windings, and the power converter further comprising at least two bridge circuits and at least two ports, each port being connectable to one of said devices and each being coupled to a respective winding of said transformer through a respective bridge circuit, each bridge circuit comprising a number of controllable switches; - the method comprising;
generating an AC voltage at each bridge circuit, said AC voltage being applied to the respective winding of the transformer; controlling a phase shift between a phase of each AC voltage on each winding in order to control a power transfer between the devices coupled to the ports; and controlling a duty cycle of at least one AC voltage on a winding to adapt said AC voltage on the winding to a desired voltage on the port coupled to said winding and to adapt said AC voltage on the winding to an AC voltage on at least one other winding. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- the method comprising;
Specification