Slew rate limited reference for a buck converter
AssigneeArques Technology
InventorsStuart Pullen, Terry J. Groom
Life of this patent
Estimating the term…
Abstract
A compensated reference voltage for the controller of a buck regulator corrects for offsets and controls the rate at which the output load current can change in response to a change in the reference setting output voltage level of the buck converter. A current source is coupled to a resistor that has one terminal connected to the ground potential of the output voltage. The voltage across this resistor generates a remote reference voltage. A feedback current is generated as a function of the difference between the remote reference voltage and the output voltage. The feedback current is time integrated to form the compensated reference, which is used to control the ON-time of the buck converter.
Claims26
A power supply comprising:
- a buck regulator coupled to a regulator input voltage and generating a regulated output voltage for powering a load referenced to a first ground potential in response to an ON-time voltage pulse, wherein said ON-time voltage pulse has a first logic state when said regulated output voltage supplies energy to said load directly from said regulator input and a second logic state when said regulated output voltage is supplying energy stored from said regulator input voltage;
- a controller for generating said ON-time voltage pulse in response to said regulator input voltage, said regulated output voltage, and a compensated reference voltage;
- a reference circuit having a reference output generating a modified reference voltage relative to said first ground potential in response to a reference input voltage generated relative to a second ground potential;
- and
- compensated reference circuitry for generating said compensated reference voltage as a time integral of a difference between said modified reference voltage and said regulator output voltage multiplied times a gain factor.
A system comprising:
- a processor referenced to a first ground potential;
- a memory for storing instructions and data for said processor;
- a power supply having a buck regulator coupled to a regulator input voltage and generating a regulated output voltage coupled to said processor in response to an ON-time voltage pulse wherein said ON-time voltage pulse has a first logic state when said regulated output voltage supplies energy to said processor directly from said regulator input and a second logic state when said regulated output voltage is supplying energy stored from said regulator input voltage;
- a controller for generating said ON-time voltage pulse in response to said regulator input voltage, said regulated output voltage, and a compensated reference voltage;
- a reference circuit having a reference output generating a modified reference voltage relative to said first ground potential in response to a reference input voltage generated relative to a second ground potential;
- and
- compensated reference circuitry for generating said compensated reference voltage as a time integral of a difference between said modified reference voltage and said regulator output voltage multiplied times a gain factor.
Dependencies are inferred from the claim text.