Back to results
US 8,283,900 B2Granted
Methods and systems for controlling boost converters
AssigneeGM Global Technologies Operations LLC
InventorsSeok-Joo Jang, Ray M. Ransom
Life of this patent
Estimating the term…
Abstract
A method for controlling a boost converter having a duty cycle includes the steps of receiving an electric current command for the boost converter, measuring a source current for the boost converter, regulating the duty cycle as a function of the electric current command and the source current, subject to a first minimum limit if a rapid change in duty cycle is required above a predetermined threshold and a second minimum limit if the rapid change in duty cycle is not required.
Claims16
A method for controlling a boost converter having a duty cycle, the method comprising the steps of:
- obtaining a boost ratio of the boost converter;
- obtaining an existing value of the duty cycle;
- receiving an electric current command for the boost converter;
- measuring a source current for the boost converter;
- and
- regulating the duty cycle as a function of the electric current command, the boost ratio, and the source current, subject to:
- a first minimum limit and a first maximum limit if the existing value of the duty cycle is greater than or equal to a first predetermined threshold, the electric current command and the source current are less than a second predetermined threshold apart, or both;
- and
- a second minimum limit and a second maximum limit if the existing value of the duty cycle is less than the first predetermined threshold and the electric current command and the source current are at least the second predetermined threshold apart.
6 more elements
A method for controlling a boost converter having a duty cycle, the method comprising the steps of:
- receiving an electric current command for the boost converter;
- measuring a source current for the boost converter;
- determining a boost ratio for the boost converter;
- determining an existing value of the duty cycle;
- regulating the duty cycle as a function of the electric current command, the source current, and the boost ratio if the existing value of the duty cycle is greater than or equal to a first predetermined value, a difference between the electric current command and the source current is less than a second predetermined value, or both;
- forcing the duty cycle to a first fixed value if the existing value of the duty cycle is greater than or equal to a first predetermined value, the difference between the electric current command and the source current is less than the second predetermined value, or both;
- and
- forcing the duty cycle to a second fixed value if the existing value of the duty cycle is less than the first predetermined value, the difference between the electric current command and the source current is greater than or equal to the second predetermined value, and the source current is greater than or equal to the electric current command, the second fixed value being equal to the existing value of the duty cycle minus the constant, wherein:
- the first fixed value is equal to the existing value of the duty cycle plus a first constant;
- and
- the second fixed value is equal to the existing value of the duty cycle minus a second constant.
8 more elements
A system for controlling a boost converter having a duty cycle, the system comprising:
- a first sensor configured to measure a source current of the boost converter;
- a second sensor configured to measure an input voltage of the boost converter;
- a third sensor configured to measure an output voltage of the boost converter;
- and
- a processor coupled to the first sensor, the second sensor, and the third sensor and configured to:
- receive an electric current command;
- obtain an existing value of the duty cycle;
- calculate a boost ratio using the input voltage and the output voltage;
- and
- regulate the duty cycle as a function of the electric current command, the boost ratio, and the source current, subject to:
- a first minimum limit and a first maximum limit if the existing value of the duty cycle is greater than or equal to a first predetermined threshold, the electric current command and the source current are less than a second predetermined threshold apart, or both;
- and
- a second minimum limit and a second maximum limit if the existing value of the duty cycle is less than the first predetermined threshold and the electric current command and the source current are at least the second predetermined threshold apart.
10 more elements
A system for controlling a boost converter having a duty cycle, the system comprising:
- a first sensor configured to measure a source current of the boost converter;
- a second sensor configured to measure an input voltage of the boost converter;
- a third sensor configured to measure an output voltage of the boost converter;
- and
- a processor coupled to the first sensor, the second sensor, and the third sensor and configured to:
- receive an electric current command;
- obtain an existing value of the duty cycle;
- calculate a boost ratio using the input voltage and the output voltage;
- and
- regulate the duty cycle as a function of the electric current command, the boost ratio, and the source current, subject to:
- a first minimum limit and a first maximum limit if a rapid change in duty cycle is required above a predetermined threshold;
- and
- a second minimum limit and a second maximum limit if the rapid change in duty cycle is not required,
- wherein:
- the first minimum and maximum limits are independent of the existing value of the duty cycle;
- and
- the second minimum and maximum limits are dependent upon the existing value of the duty cycle.
14 more elements
A system for controlling a boost converter having a duty cycle, the system comprising:
- a first sensor configured to measure a source current of the boost converter;
- a second sensor configured to measure an input voltage of the boost converter;
- a third sensor configured to measure an output voltage of the boost converter;
- and
- a processor coupled to the first sensor, the second sensor, and the third sensor and configured to:
- receive an electric current command;
- calculate a boost ratio using the input voltage and the output voltage;
- and
- regulate the duty cycle as a function of the electric current command, the boost ratio, and the source current, subject to:
- a first minimum limit and a first maximum limit if a rapid change in duty cycle is required above a predetermined threshold;
- and
- a second minimum limit and a second maximum limit if the rapid change in duty cycle is not required;
- wherein the second minimum limit is equal to the second maximum limit.
10 more elements
Dependencies are inferred from the claim text.