Cascade boost and inverting buck converter with independent control
First Claim
1. A converter system, comprising:
- a cascade boost converter and inverting buck converter for converting a rectified AC voltage to a DC output current;
a controller having input and output control signals referenced to a common voltage, wherein said controller is configured to control switching of said boost converter and switching of said inverting buck converter in an independent manner to decouple operation of said inverting buck converter from operation of said boost converter; and
wherein said controller is configured to control said boost converter with a plurality of boost pulses on a boost pulse signal referenced to said common voltage, wherein said controller is configured to control said inverting buck converter with a plurality of buck pulses on a buck pulse signal referenced to said common voltage, and wherein each of said plurality of boost pulses is wider than a corresponding one of said plurality of buck pulses.
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Accused Products
Abstract
A converter system including a cascade boost converter and inverting buck converter and controller for converting a rectified AC voltage to a DC output current. The system uses inductors and is configured to use a common reference voltage. The controller is configured to control switching of the converters in an independent manner to decouple operation from each other. For example, control pulses for the boost converter may be wider than pulses for the buck converter. The controller may control the boost converter based on constant on-time control and may control the inverting buck converter based on peak current control. The rectified AC voltage may be an AC conductive angle modulated voltage, where the controller may inhibit switching of the inverted buck converter at a dimming frequency having a duty cycle based on a phase angle of the AC conductive angle modulated voltage.
19 Citations
19 Claims
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1. A converter system, comprising:
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a cascade boost converter and inverting buck converter for converting a rectified AC voltage to a DC output current; a controller having input and output control signals referenced to a common voltage, wherein said controller is configured to control switching of said boost converter and switching of said inverting buck converter in an independent manner to decouple operation of said inverting buck converter from operation of said boost converter; and wherein said controller is configured to control said boost converter with a plurality of boost pulses on a boost pulse signal referenced to said common voltage, wherein said controller is configured to control said inverting buck converter with a plurality of buck pulses on a buck pulse signal referenced to said common voltage, and wherein each of said plurality of boost pulses is wider than a corresponding one of said plurality of buck pulses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A controller for controlling a cascade boost converter and an inverting buck converter for converting a rectified AC voltage to a DC output current, comprising:
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a boost controller configured to provide at least one first control signal referenced to a common voltage for controlling switching of the boost converter; a buck controller configured to provide at least one second control signal referenced to the common voltage for controlling switching of the inverting buck converter in an independent manner to decouple operation of the inverting buck converter from operation of the boost converter; and wherein said boost controller is configured to generate a plurality of boost pulses on said first control signal; wherein said buck controller is configured to generate a corresponding plurality of buck pulses on said second control signal; and wherein each of said plurality of boost pulses is wider than a corresponding one of said plurality of buck pulses. - View Dependent Claims (12, 13, 14)
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15. A method of controlling a cascade boost converter and inverting buck converter for converting a rectified AC voltage to a DC output current, comprising:
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generating a plurality of boost pulses on a boost pulse signal referenced to a common voltage for controlling switching of the boost converter; generating a plurality of buck pulses on a buck pulse signal referenced to the common voltage for controlling switching of the inverting buck converter in an independent manner to decouple operation of the inverting buck converter from operation of the boost converter; and wherein said generating a plurality of boost pulses and said generating a plurality of buck pulses comprises generating each boost pulse to be wider than a corresponding buck pulse. - View Dependent Claims (16, 17, 18, 19)
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Specification