Apparatus, system and method for cascaded power conversion
First Claim
1. An apparatus for power conversion, the apparatus couplable to a nonlinear load, the apparatus comprising:
- a first power converter stage comprising a power switch and a first inductor, the first inductor having a first inductance;
a first sensor coupled to the first power converter stage and coupled to a common reference node, the first sensor adapted to sense a first parameter of the first power converter stage;
a second power converter stage coupled to the first power converter stage, the second power converter stage comprising a second inductor, the second inductor having a second inductance, the second power converter stage couplable to provide an output current to the nonlinear load;
a second sensor coupled to the common reference node and couplable to the nonlinear load, the second sensor adapted to sense the output current level; and
a controller coupled to the power switch, the first sensor and the second sensor, the controller adapted to turn the power switch into an on state for an on-time duration substantially proportional to a ratio of the second inductance to the first inductance.
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Accused Products
Abstract
An apparatus method and system are provided for power conversion, to supply power to a nonlinear load such as a plurality of light emitting diodes. An exemplary apparatus comprises a first power converter stage, a second power converter stage, a plurality of sensors such as first and second sensors, and a controller. The first power converter stage includes a power switch and a first inductor having a first inductance. The first and second sensors are both coupled to a common reference node, with the first sensor adapted to sense a first parameter of the first power converter stage, and the second sensor adapted to sense the output current level. The second power converter stage includes a second inductor having a second inductance, and is couplable to provide an output current to the nonlinear load such as LEDs. The controller is coupled to the power switch, the first sensor and the second sensor, and the controller is adapted to turn the power switch into an on state for an on-time duration substantially proportional to a ratio of the second inductance to the first inductance.
47 Citations
70 Claims
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1. An apparatus for power conversion, the apparatus couplable to a nonlinear load, the apparatus comprising:
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a first power converter stage comprising a power switch and a first inductor, the first inductor having a first inductance; a first sensor coupled to the first power converter stage and coupled to a common reference node, the first sensor adapted to sense a first parameter of the first power converter stage; a second power converter stage coupled to the first power converter stage, the second power converter stage comprising a second inductor, the second inductor having a second inductance, the second power converter stage couplable to provide an output current to the nonlinear load; a second sensor coupled to the common reference node and couplable to the nonlinear load, the second sensor adapted to sense the output current level; and a controller coupled to the power switch, the first sensor and the second sensor, the controller adapted to turn the power switch into an on state for an on-time duration substantially proportional to a ratio of the second inductance to the first inductance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method of providing power conversion for a nonlinear load using a power converter comprising a power switch and a first power converter stage coupled to a second power converter stage, the first power converter stage comprising a first inductor having a first inductance and the second power converter stage comprising a second inductor having a second inductance, the method comprising:
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sensing a first parameter of the first power converter stage with reference to a common potential; turning on the power switch for an on-time duration of a switching cycle and providing an output current to the nonlinear load, the on-time duration substantially proportional to a ratio of the second inductance to the first inductance; and sensing the output current level with reference to the common potential. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A system for power conversion, the system couplable to receive an input voltage, the system comprising:
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a plurality of light emitting diodes; a first power converter stage comprising a power switch, a first capacitor, and a first inductor, the first inductor having a first inductance; a first sensor coupled to the first power converter stage and coupled to a common reference node, the first sensor adapted to sense a first parameter of the first power converter stage; a second power converter stage coupled to the first power converter stage, the second power converter stage comprising a second inductor and a second capacitor, the second inductor having a second inductance, the second power converter stage coupled to the plurality of light emitting diodes to provide an output current to the plurality of light emitting diodes; a second sensor coupled to the common reference node and to the plurality of light emitting diodes, the second sensor adapted to sense the output current level; and a controller coupled to the power switch, the first sensor and the second sensor, the controller adapted to turn the power switch into an on state for an on-time duration substantially proportional to a ratio of the second inductance to the first inductance. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69)
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70. An apparatus for power conversion, the apparatus couplable to a plurality of light emitting diodes and couplable to receive an input voltage, the apparatus comprising:
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a first power converter stage comprising; a power switch; a first capacitor coupled to the power switch; a first inductor coupled to the power switch, the first inductor having a first inductance; and a first diode couplable to the input voltage and coupled to the first inductor; a first resistor coupled to the power switch and coupled to a common reference node couplable to a ground potential; a second power converter stage coupled to the first power converter stage, the second power converter stage couplable to provide an output current to the plurality of light emitting diodes, the second power converter stage comprising; a second inductor having a second inductance; a second diode coupled to the second inductor and couplable to the plurality of light emitting diodes; and a second capacitor coupled to the second diode and couplable to the plurality of light emitting diodes; a second resistor coupled to the common reference node and couplable to the plurality of light emitting diodes; and a controller coupled to the power switch, the first resistor and the second resistor, the controller adapted to turn the power switch into an on state for an on-time duration substantially proportional to a ratio of the second inductance to the first inductance.
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Specification