Voltage conversion control apparatus for a boost converter configured to boost or step down output voltage of an electricity storage apparatus

Patent metadata

Field	Value
Publication number	US-9825529-B2
Application number	US-201314435002-A
Country	US
Kind code	B2
Filing date	Sep 30, 2013
Priority date	Oct 12, 2012
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

A voltage conversion control apparatus is a voltage conversion control apparatus which controls a voltage converter having an upper switching element and a lower switching element, and has a calculating device which calculates duty ratio such that output current of an electricity storage apparatus reaches target value and the duty ratio is within predetermined allowable range; a limit relaxing device which relaxes at least one of upper limit value and lower limit value of the allowable range on the basis of magnitude relationship between predetermined threshold value and current deviation which is obtained by subtracting the output current from the target value; and a controlling device which controls the upper switching element and the lower switching element to perform a switching control on the basis of the duty ratio which is calculated by the calculating device.

First claim

The invention claimed is:

1. A voltage conversion control apparatus which controls a boost converter, the boost converter being capable of boosting or stepping down an output voltage of an electricity storage apparatus and having an upper switching element at a high potential side and a lower switching element at a low potential side which are connected in series,
the voltage conversion control apparatus comprising a controller:
the controller being configured to calculate a duty ratio such that an output current of the electricity storage apparatus reaches a target value and the duty ratio is within a predetermined allowable range, wherein the duty ratio represents a rate of a period during which the upper switching element is turned on;
the controller being configured to relax at least one of an upper limit value and a lower limit value of the allowable range on the basis of a magnitude relationship between a predetermined threshold value and a current deviation which is obtained by subtracting the output current from the target value; and
the controller being configured to control the upper switching element and the lower switching element to perform a switching control on the basis of the duty ratio which is calculated by the controller,
the controller being configured to control the upper switching element and the lower switching element to perform the switching control on the basis of the duty ratio which is within the allowable range which is relaxed by the controller until a period which is required for the output current to reach the target value passes.

2. The voltage conversion control apparatus according to claim 1 , wherein
when the current deviation is larger than a first threshold value that is a positive value, the controller is configured to make the lower limit value smaller than the case where the current deviation is equal to or smaller than the first threshold value.

3. The voltage conversion control apparatus according to claim 1 , wherein
when the current deviation is larger than a first threshold value that is a positive value, the controller is configured to set 0% to the lower limit value.

4. The voltage conversion control apparatus according to claim 1 , wherein
when the current deviation is smaller than a second threshold that is a negative value, the controller is configured to make the upper limit value larger than the case where the current deviation is equal to or larger than the second threshold value.

5. The voltage conversion control apparatus according to claim 1 , wherein
when the current deviation is smaller than a second threshold value that is a negative value, the controller is configured to set 100% to the upper limit value.

6. The voltage conversion control apparatus according to claim 1 , wherein
the controller is configured to change the predetermined threshold value on the basis of an element temperature of at least one of the upper switching element and the lower switching element.

7. The voltage conversion control apparatus according to claim 6 , wherein
when the current deviation is larger than a first threshold value that is a positive value, the controller is configured to relax the lower limit value, compared to the case where the current deviation is equal to or smaller than the first threshold value,
the controller is configured to change the first threshold value such that the first threshold value in the case where the element temperature is larger than a predetermined temperature is smaller than the first threshold value in the case where the element temperature is equal to or smaller than the predetermined temperature.

8. The voltage conversion control apparatus according to claim 6 , wherein
when the current deviation is smaller than a second threshold that is a negative value, the controller is configured to relax the upper limit value, compared to the case where the current deviation is equal to or larger than the second threshold value,
the controller is configured to change the second threshold value such that the second threshold value in the case where the element temperature is larger than a predetermined temperature is larger than the second threshold value in the case where the element temperature is equal to or smaller than the predetermined temperature.

9. The voltage conversion control apparatus according to claim 1 , wherein
the controller is configured to relax at least one of the upper limit value and the lower limit value on the basis of an elapsed period after a first duty ratio which is calculated by the controller starts to be beyond the not-relaxed allowable range, wherein the controller does not use the allowable range when the controller calculates the first duty ratio.

10. The voltage conversion control apparatus according to claim 9 , wherein
the controller is configured to relax relaxes the lower limit value, when an elapsed period after the first duty ratio starts to be smaller than the not-relaxed lower limit value is equal to or smaller than a predetermined period.

11. The voltage conversion control apparatus according to claim 9 , wherein
the controller is configured to relax the upper limit value, when an elapsed period after the first duty ratio starts to be larger than the not-relaxed upper limit value is equal to or smaller than a predetermined period.

Assignees

• Toyota Motor Co Ltd

Inventors

• Takamatsu Naoyoshi
• Okamura Masaki
• Yamakawa Toshifumi

Classifications

• B60L11/14

  Operations & Transport · mapped topic

• H02M3/156 Primary

  with automatic control of output voltage or current, e.g. switching regulators · CPC title

• H02M2003/1552

  Electricity · mapped topic

• B60L2240/526

  Operating parameters · CPC title

• Y02T10/7077

  Cross-Sectional Technologies · mapped topic