System and method for operating a DC to DC power converter
First Claim
1. A direct current (DC) to DC power converter, comprising:
- a first bus converter for converting a first DC bus voltage into a first high frequency AC voltage;
a second bus converter for converting a second high frequency alternating current (AC) voltage into a second DC bus voltage;
a resonant circuit for coupling the first bus converter and the second bus converter;
a controller for providing switching signals to the first bus converter and the second bus converter to operate the power converter in a soft switching mode, wherein the controller comprises;
a switching frequency controller for determining a switching frequency signal for the power converter based on a reference output current, wherein when the reference output current is below a first load current value the switching frequency signal is maintained at a first switching frequency and when the reference output current is above a second load current value the switching frequency signal is maintained at a second switching frequency, and wherein when the reference output current is between the first load current value and the second load value, the switching frequency signal is adjusted according to a value of the reference output current; and
a phase shift controller for determining a phase shift signal for the power converter, wherein when the reference output current is lower than the first load current or higher than the second load current the phase shift is determined according to the reference output current, and wherein when the reference output current is between the first load current and the second load current the phase shift is determined based on the switching frequency, the reference output current and perturbations in the output current.
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Accused Products
Abstract
A direct current (DC) to DC power converter includes a first bus converter for converting a first DC bus voltage into a first high frequency AC voltage and a second bus converter for converting a second high frequency alternating current (AC) voltage into a second DC bus voltage. The DC to DC converter also includes a resonant circuit for coupling the first bus converter and the second bus converter and a controller for providing switching signals to the first bus converter and the second bus converter to operate the power converter in a soft switching mode. The controller includes a switching frequency controller for determining a switching frequency signal for the power converter based on a reference output current and a phase shift controller for determining a phase shift signal for the power converter. When the reference output current is lower than the a first load current value the switching frequency signal is maintained at a first switching frequency and the phase shift is determined according to the reference output current. Further, when the reference output current is above a second load current value the switching frequency signal is maintained at a second switching frequency and the phase shift is determined according to the reference output current. When the reference output current is between the first load current value and the second load current value, the switching frequency signal is adjusted according to a value of the reference output current and the phase shift is determined based on the switching frequency, the reference output current and perturbations in the output current.
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Citations
22 Claims
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1. A direct current (DC) to DC power converter, comprising:
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a first bus converter for converting a first DC bus voltage into a first high frequency AC voltage; a second bus converter for converting a second high frequency alternating current (AC) voltage into a second DC bus voltage; a resonant circuit for coupling the first bus converter and the second bus converter; a controller for providing switching signals to the first bus converter and the second bus converter to operate the power converter in a soft switching mode, wherein the controller comprises; a switching frequency controller for determining a switching frequency signal for the power converter based on a reference output current, wherein when the reference output current is below a first load current value the switching frequency signal is maintained at a first switching frequency and when the reference output current is above a second load current value the switching frequency signal is maintained at a second switching frequency, and wherein when the reference output current is between the first load current value and the second load value, the switching frequency signal is adjusted according to a value of the reference output current; and a phase shift controller for determining a phase shift signal for the power converter, wherein when the reference output current is lower than the first load current or higher than the second load current the phase shift is determined according to the reference output current, and wherein when the reference output current is between the first load current and the second load current the phase shift is determined based on the switching frequency, the reference output current and perturbations in the output current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of operating a DC to DC power converter having a first bus converter coupled to a second bus converter by a resonant circuit, said method comprising:
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adjusting a switching frequency of the power converter according to a reference output current when the reference output current is in between a first load current value and a second load value; maintaining the switching frequency of the power converter at a first switching frequency when the reference output current is lower than a first current value; maintaining the switching frequency of the power converter at a second switching frequency when the reference output current is higher than a second current value; determining a phase shift value for the power converter based on the reference output current; wherein when the reference output current is lower than the first load current or higher than the second load current the phase shift is determined according to the reference output current, and wherein when the reference output current is between the first load current and the second load current the phase shift is determined based on the switching frequency, the reference output current and perturbations in the output current. - View Dependent Claims (15, 16)
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17. A power system for a marine application, comprising:
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an alternating current (AC) bus connected to a generator and supplying power to an auxiliary load; a first direct current (DC) bus having a first DC voltage supplying power to a first load; an AC to DC converter coupled between the AC bus and the first DC bus; a second DC bus having a second DC voltage supplying power to a second load; a DC to DC converter coupled between the first DC bus and the second DC bus, wherein the DC to DC converter comprises; a first bus converter for converting a first DC bus voltage into a first high frequency AC voltage; a second bus converter for converting a second high frequency alternating current (AC) voltage into a second DC bus voltage; a resonant circuit for coupling the first bus converter and the second bus converter; a controller for providing switching signals to the first bus converter and the second bus converter to operate the power converter in a soft switching mode, wherein the controller comprises; a switching frequency controller for determining a switching frequency signal for the power converter based on a reference output current, wherein the when the reference output current is below a first load current value the switching frequency signal is maintained at a first switching frequency and when the reference output current is above a second load current value the switching frequency signal is maintained at a second switching frequency, wherein when the reference output current is between the first load current value and the second load value, the switching frequency signal is adjusted according to a value of the reference output current; and a phase shift controller for determining a phase shift signal for the power converter based on the reference output current, wherein when the reference output current is lower than the first load current or higher than the second load current the phase shift is determined according to the reference output current, and wherein when the reference output current is between the first load current and the second load current the phase shift is determined based on the switching frequency, the reference output current and perturbations in the output current. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification