Protection from hard commutation events at power switches
First Claim
Patent Images
1. A method comprising:
- during a current switching cycle of first and second power switches of a half-bridge of a resonant converter, determining whether a hard commutation event will occur at the half-bridge during a future switching cycle of the first and second power switches by at least;
determining a direction of current flowing between a switching node of the half-bridge and a resonant capacitor of the resonant converter;
determining a respective operating state of each of the first and second power switches;
determining, based on the direction of the current and the respective operating states of the first and second power switches, whether the first power switch is operating in reverse operation mode by conducting on a respective body diode of the first power switch while the second switch is conducting through a forward conduction channel of the second switch; and
responsive to determining that the first power switch is operating in reverse operation mode while the second switch is conducting through the forward conduction channel, determining that the hard commutation event will occur during the future switching cycle;
responsive to determining that the hard commutation event will occur during the future switching cycle, activating at least one hard commutation countermeasure; and
responsive to determining that the hard commutation event will not occur during the future switching cycle, refraining from activating the at least one hard commutation countermeasure.
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Abstract
A system is described that includes a half-bridge, a first driver, a second driver, and a controller unit. The half-bridge includes a first switch coupled to a second switch at a switching node. The first driver is configured to drive the first switch and the second driver is configured to drive the second switch. The controller unit is configured to determine whether a hard commutation event is likely to occur at the half-bridge during a future switching cycle, and responsive to determining that the hard commutation event is likely to occur during the future switching cycle, control the first driver and the second driver to activate at least one hard commutation countermeasure.
25 Citations
18 Claims
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1. A method comprising:
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during a current switching cycle of first and second power switches of a half-bridge of a resonant converter, determining whether a hard commutation event will occur at the half-bridge during a future switching cycle of the first and second power switches by at least; determining a direction of current flowing between a switching node of the half-bridge and a resonant capacitor of the resonant converter; determining a respective operating state of each of the first and second power switches; determining, based on the direction of the current and the respective operating states of the first and second power switches, whether the first power switch is operating in reverse operation mode by conducting on a respective body diode of the first power switch while the second switch is conducting through a forward conduction channel of the second switch; and responsive to determining that the first power switch is operating in reverse operation mode while the second switch is conducting through the forward conduction channel, determining that the hard commutation event will occur during the future switching cycle; responsive to determining that the hard commutation event will occur during the future switching cycle, activating at least one hard commutation countermeasure; and responsive to determining that the hard commutation event will not occur during the future switching cycle, refraining from activating the at least one hard commutation countermeasure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A controller unit for a power circuit, the controller unit being configured to:
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during a current switching cycle of a half-bridge, determine whether a hard commutation event will occur at the half-bridge during a future switching cycle, wherein the half-bridge includes a first switch coupled to a second switch at a switching node, wherein the controller unit is configured to determine whether the hard commutation event will occur at the half-bridge during the future switching cycle based at least in part on a direction of current flowing between the switching node and a resonant capacitor, and a respective operating state of each of the first and second switches; and responsive to determining that the hard commutation event will occur during the future switching cycle, control a first driver and a second driver to activate at least one hard commutation countermeasure, wherein the first driver drives the first switch and the second driver drives the second switch. - View Dependent Claims (13, 14, 15)
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16. A controller unit for a power circuit, the controller unit being configured to:
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during a current switching cycle of first and second power switches of a half-bridge of a resonant converter, determine whether to activate a hard commutation countermeasure during a future switching cycle of the first and second power switches by at least; determining a respective direction of current flowing through each of the first and second power switches; determining, based on the respective directions of the current flowing through each of the first and second power switches, whether the first power switch is operating in reverse operation mode while the second switch is conducting through a forward conduction channel of the second switch; and responsive to determining that the first power switch is operating in reverse operation mode while the second switch is conducting through the forward conduction channel, determining to activate the hard commutation countermeasure during the future switching cycle; responsive to determining to activate the hard commutation countermeasure during the future switching cycle, activate at least one hard commutation countermeasure; and responsive to determining to not activate the hard commutation countermeasure during the future switching cycle, refrain from activating the at least one hard commutation countermeasure. - View Dependent Claims (17, 18)
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Specification