Adaptive soft switching control for power converter
First Claim
1. A control apparatus for use in controlling a power converter adapted to carry out power conversion between a high-voltage end and a low-voltage end of the power converter, the power converter comprising a first switching sub-circuit and a second switching sub-circuit connected to the first switching sub-circuit, the first switching sub-circuit including a first controllable switching element and the second switching sub-circuit including a second controllable switching element, the control apparatus comprising:
- an input configured for receiving at least one input signal conveying a sensed voltage across the high-voltage end, a sensed voltage across the low-voltage end and a sensed current through the low-voltage end;
circuitry configured for determining a target switching frequency, a target dead time and a target duty cycle for the power converter at least in part by processing the sensed voltages, the sensed current and at least one circuit characteristic of the power converter; and
a switching controller configured for processing the target switching frequency, the target dead time and the target duty cycle to generate at least one output control signal, said output control signal being configured to;
cause the first controllable switching element to switch from an off state to an on state and back to the off state in accordance with the derived target switching frequency and the derived target duty cycle; and
cause the second controllable switching element to switch from an off state to an on state and back to the off state while the first controllable switching element is in the off state, wherein after the second controllable switching element switches back to the off state, each of the first and second controllable switching elements remains in the off state for the derived target dead time before the first controllable switching element is switched back to the on state.
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Abstract
A control apparatus for use in controlling a power converter adapted to carry out power conversion between a high-voltage end and a low-voltage end includes an input configured for receiving at least one input signal conveying a sensed voltage across the high-voltage end, a sensed voltage across the low-voltage end and a sensed current through the low-voltage end; circuitry configured for determining a target switching frequency, a target dead time and a target duty cycle for the converter based at least in part on the sensed voltages, the sensed current and at least one circuit characteristic of the converter; and an output configured for releasing at least one output signal to cause the converter to carry out soft switching in accordance with the target switching frequency, the target dead time and the target duty cycle.
18 Citations
19 Claims
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1. A control apparatus for use in controlling a power converter adapted to carry out power conversion between a high-voltage end and a low-voltage end of the power converter, the power converter comprising a first switching sub-circuit and a second switching sub-circuit connected to the first switching sub-circuit, the first switching sub-circuit including a first controllable switching element and the second switching sub-circuit including a second controllable switching element, the control apparatus comprising:
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an input configured for receiving at least one input signal conveying a sensed voltage across the high-voltage end, a sensed voltage across the low-voltage end and a sensed current through the low-voltage end; circuitry configured for determining a target switching frequency, a target dead time and a target duty cycle for the power converter at least in part by processing the sensed voltages, the sensed current and at least one circuit characteristic of the power converter; and a switching controller configured for processing the target switching frequency, the target dead time and the target duty cycle to generate at least one output control signal, said output control signal being configured to; cause the first controllable switching element to switch from an off state to an on state and back to the off state in accordance with the derived target switching frequency and the derived target duty cycle; and cause the second controllable switching element to switch from an off state to an on state and back to the off state while the first controllable switching element is in the off state, wherein after the second controllable switching element switches back to the off state, each of the first and second controllable switching elements remains in the off state for the derived target dead time before the first controllable switching element is switched back to the on state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for controlling a power converter adapted to carry out power conversion between a high-voltage end and a low-voltage end of the power converter, the power converter comprising a first switching sub-circuit and a second switching sub-circuit connected to the first switching sub-circuit, the first switching sub-circuit including a first controllable switching element and the second switching sub-circuit including a second controllable switching element, the method comprising:
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determining a voltage across the high-voltage end, a voltage across the low-voltage end and a current through the low-voltage end; determining a target switching frequency, a target dead time and a target duty cycle for the converter at least in part by processing the voltage across the high-voltage end, the voltage across the low-voltage end, the current through the low-voltage end and at least one circuit characteristic of the converter; processing the target switching frequency, the target dead time and the target duty cycle to generate at least one output control signal for controlling time instants at which the first controllable switching element and the second controllable switching element are to be switched between on and off states, wherein the output control signal generated being configured to cause the converter to carry out soft switching at least in part by; causing the first controllable switching element to switch from an off state to an on state and back to the off state in accordance with the derived target switching frequency and the derived target duty cycle; and causing the second controllable switching element to switch from an off state to an on state and back to the off state while the first controllable switching element is in the off state, wherein after the second controllable switching element switches back to the off state, each of the first and second controllable switching elements remains in the off state for the derived target dead time before the first controllable switching element is switched back to the on state; and releasing the output control signal. - View Dependent Claims (15, 16, 17, 18)
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19. A non-transitory computer-readable storage medium storing computer-readable instructions which, when executed by a controller, cause the controller to execute a method of controlling a power converter adapted to carry out power conversion between a high-voltage end and a low-voltage end of the power converter, the power converter comprising a first switching sub-circuit and a second switching sub-circuit connected to the first switching sub-circuit, the first switching sub-circuit including a first controllable switching element and the second switching sub-circuit including a second controllable switching element, the method comprising:
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determining a voltage across the high-voltage end, a voltage across the low-voltage end and a current through the low-voltage end; determining a target switching frequency, a target dead time and a target duty cycle for the converter at least in part by processing the voltage across the high-voltage end, the voltage across the low-voltage end, the current through the low-voltage end and at least one circuit characteristic of the converter; processing the target switching frequency, the target dead time and the target duty cycle to generate at least one output control signal for controlling time instants at which the first controllable switching element and the second controllable switching element are to be switched between on and off states, wherein the output control signal generated being configured to cause the converter to carry out soft switching at least in part by; causing the first controllable switching element to switch from an off state to an on state and back to the off state in accordance with the derived target switching frequency and the derived target duty cycle; and causing the second controllable switching element to switch from an off state to an on state and back to the off state while the first controllable switching element is in the off state, wherein after the second controllable switching element switches back to the off state, each of the first and second controllable switching elements remains in the off state for the derived target dead time before the first controllable switching element is switched back to the on state; and releasing the output control signal.
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Specification