Isolated DC-DC converter including ZVS full-bridge and current doubler
First Claim
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1. A DC to DC converter comprising:
- a full bridge inverter having a positive input, a negative input, a first output, and a second output, said full bridge inverter comprising a first high side switch, a second high side switch, a first low side switch, and a second low side switch, each of said switches having an on state and an off state wherein the switch will conduct current in the on state and will not conduct current in the off state;
a current doubler connected between the first output and the second output of the full bridge inverter;
a first current sensor connected between the positive input of the full bridge inverter and the first high side switch of the full bridge inverter, said first current sensor for providing a signal indicative of a current from a power source to the first high side switch; and
a controller for receiving the signal indicative of the current from the power source to the first high side switch and selectively switching each of the first high side switch, second high side switch, first low side switch, and second low side switch between the on state and the off state as a function of said signal indicative of the current from the power source to the first high side switch.
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Abstract
An isolated DC to DC converter including zero voltage switching and a current doubler. Current sensors are located between a positive input of the DC to DC converter and a current doubler is used in an output stage of the DC to DC converter in order to enable more accurate current sensing in a main transformer to prevent saturation of the transformer core and provide increased efficiency and power output with lower electromagnetic noise. The input of the DC to DC converter is isolated from the output of the DC to DC converter, and the DC to DC converter may be used in a hybrid or all-electric vehicle to provide an accessory bus from a power source of the vehicle.
23 Citations
30 Claims
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1. A DC to DC converter comprising:
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a full bridge inverter having a positive input, a negative input, a first output, and a second output, said full bridge inverter comprising a first high side switch, a second high side switch, a first low side switch, and a second low side switch, each of said switches having an on state and an off state wherein the switch will conduct current in the on state and will not conduct current in the off state; a current doubler connected between the first output and the second output of the full bridge inverter; a first current sensor connected between the positive input of the full bridge inverter and the first high side switch of the full bridge inverter, said first current sensor for providing a signal indicative of a current from a power source to the first high side switch; and a controller for receiving the signal indicative of the current from the power source to the first high side switch and selectively switching each of the first high side switch, second high side switch, first low side switch, and second low side switch between the on state and the off state as a function of said signal indicative of the current from the power source to the first high side switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A hybrid or all-electric vehicle comprising:
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a power source operating between about 250 volts and 400 volts; an electrical system configured to operate at about 12 to 14 volts or 24 to 28 volts; and a DC to DC converter connected to the power source and the electrical system, said DC to DC converter comprising; a full bridge inverter having a positive input, a negative input, a first output, and a second output, said full bridge inverter comprising a first high side switch, a second high side switch, a first low side switch, and a second low side switch, each of said switches having an on state and an off state wherein the switch will conduct current in the on state and will not conduct current in the off state; a current doubler connected between the first output and the second output of the full bridge inverter; a first current sensor connected between the positive input of the full bridge inverter and the first high side switch of the full bridge inverter, said first current sensor for providing a signal indicative of a current from a power source to the first high side switch; and a controller for receiving the signal indicative of the current from the power source to the first high side switch and selectively switching each of the first high side switch, second high side switch, first low side switch, and second low side switch between the on state and the off state as a function of said signal indicative of the current from the power source to the first high side switch. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A power system comprising:
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a power source operating at a first voltage; a load configured to operate at a second voltage different from the first voltage; and a DC to DC converter connected to the power source and the electrical system, said DC to DC converter comprising; a full bridge inverter having a positive input, a negative input, a first output, and a second output, said full bridge inverter comprising a first high side switch, a second high side switch, a first low side switch, and a second low side switch, each of said switches having an on state and an off state wherein the switch will conduct current in the on state and will not conduct current in the off state; a current doubler connected between the first output and the second output of the full bridge inverter; a first current sensor connected between the positive input of the full bridge inverter and the first high side switch of the full bridge inverter, said first current sensor for providing a signal indicative of a current from a power source to the first high side switch; and a controller for receiving the signal indicative of the current from the power source to the first high side switch and selectively switching each of the first high side switch, second high side switch, first low side switch, and second low side switch between the on state and the off state as a function of said signal indicative of the current from the power source to the first high side switch. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification