Diagnostic system for a DC-DC voltage converter

Patent metadata

Field	Value
Publication number	US-10353015-B2
Application number	US-201815910422-A
Country	US
Kind code	B2
Filing date	Mar 2, 2018
Priority date	Jul 24, 2017
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

A diagnostic system for a DC-DC voltage converter is provided. An analog to digital converter measures a first low voltage level at a low voltage terminal of a DC-DC voltage converter and generates a first low voltage value based on the first low voltage level. A first buck mode monitoring application sets a first buck mode status flag equal to a first fault value when the first low voltage value is greater than a first maximum voltage value. A first buck mode diagnostic handler application transitions each of the high voltage switch and the low voltage switch to an open operational state when the first buck mode status flag is equal to the first fault value.

First claim

What is claimed is:

1. A diagnostic system for a DC-DC voltage converter operating in a buck operational mode, the DC-DC voltage converter having a high voltage switch, a low voltage switch, a DC-DC converter control circuit, a high voltage terminal, and a low voltage terminal; the DC-DC converter control circuit being electrically coupled between and to the high voltage switch and the low voltage switch, the high voltage switch being further electrically coupled to the high voltage terminal, the low voltage switch being further electrically coupled to the low voltage terminal, the diagnostic system comprising:
a microcontroller having a microprocessor and an analog-to-digital converter, the microprocessor having a first buck mode monitoring application, a first buck mode diagnostic handler application, a second buck mode monitoring application, and a second buck mode diagnostic handler application;
the analog to digital converter measuring a first low voltage level at the low voltage terminal of the DC-DC voltage converter and generating a first low voltage value based on the first low voltage level;
the first buck mode monitoring application setting a first buck mode status flag equal to a first fault value when the first low voltage value is greater than a first maximum voltage value;
the first buck mode diagnostic handler application transitioning each of the high voltage switch and the low voltage switch to an open operational state when the first buck mode status flag is equal to the first fault value;
the analog to digital converter measuring a second low voltage level at the low voltage terminal of the DC-DC voltage converter and generating a second low voltage value based on the second low voltage level;
the second buck mode monitoring application setting a second buck mode status flag equal to a second fault value when the second low voltage value is greater than a second maximum voltage value, the second maximum voltage value being greater than the first maximum voltage value; the second fault value having a Hamming distance of at least four from the first fault value; and
the second buck mode diagnostic handler application transitioning each of the high voltage switch and the low voltage switch to the open operational state when the second buck mode status flag is equal to the second fault value.

2. The diagnostic system of claim 1 , wherein the first buck mode monitoring application setting the first buck mode status flag equal to a first non-fault value when the first low voltage value is less than or equal to the first maximum voltage value, the first non-fault value having a Hamming distance of at least four from the first fault value.

3. The diagnostic system of claim 2 , wherein the second buck mode monitoring application setting the second buck mode status flag equal to a second non-fault value when the second low voltage value is less than or equal to the second maximum voltage value, the second non-fault value having a Hamming distance of at least four from the second fault value.

4. The diagnostic system of claim 3 , wherein the first non-fault value has a Hamming distance of at least four from the second non-fault value.

5. The diagnostic system of claim 1 , wherein:
the first buck mode monitoring application setting the first buck mode status flag equal to the first fault value when the first fault value is not equal to a first diversity value; and
the second buck mode monitoring application setting the second buck mode status flag equal to the second fault value when the second fault value is not equal to a second diversity value.

6. The diagnostic system of claim 1 , wherein the microprocessor further includes a third buck mode monitoring application, a third buck mode diagnostic handler application, a fourth buck mode monitoring application, and a fourth buck mode diagnostic handler application;
the analog to digital converter measuring a third low voltage level at the low voltage terminal of the DC-DC voltage converter and generating a third low voltage value based on the third low voltage level;
the third buck mode monitoring application setting a third buck mode status flag equal to a third fault value when the third low voltage value is less than a first minimum voltage value;
the third buck mode diagnostic handler application transitioning each of the high voltage switch and the low voltage switch to the open operational state when the third buck mode status flag is equal to the third fault value;
the analog to digital converter measuring a fourth low voltage level at the low voltage terminal of the DC-DC voltage converter and generating a fourth low voltage value based on the fourth low voltage level;
the fourth buck mode monitoring application setting a fourth buck mode status flag equal to a fourth fault value when the fourth low voltage value is less than a second minimum voltage value; the second minimum voltage value being less than the first minimum voltage value; the fourth fault value having a Hamming distance of at least four from the third fault value; and
the fourth buck mode diagnostic handler application transitioning each of the high voltage switch and the low voltage switch to the open operational state when the fourth buck mode status flag is equal to the fourth fault value.

7. The diagnostic system of claim 6 , wherein the third buck mode monitoring application setting the third buck mode status flag equal to a third non-fault value when the third low voltage value is greater than or equal to the first minimum voltage value; the third non-fault value having a Hamming distance of at least four from the third fault value.

8. The diagnostic system of claim 7 , wherein the fourth buck mode monitoring application setting the fourth buck mode status flag equal to a fourth non-fault value when the fourth low voltage value is greater than or equal to the second minimum voltage value, the fourth non-fault value having a Hamming distance of at least four from the fourth fault value.

9. The diagnostic system of claim 8 , wherein the third non-fault value has a Hamming distance of at least four from the fourth non-fault value.

10. The diagnostic system of claim 6 , wherein
the third buck mode monitoring application setting the third buck mode status flag equal to the third fault value when the third fault value is not equal to a third diversity value;
the fourth buck mode monitoring application setting the fourth buck mode status flag equal to the fourth fault value when the fourth fault value is not equal to a fourth diversity value.

11. A diagnostic system for a DC-DC voltage converter operating in a boost operational mode, the DC-DC voltage converter having a high voltage switch, a low voltage switch, a DC-DC converter control circuit, a high voltage terminal, and a low voltage terminal; the DC-DC converter control circuit being electrically coupled between and to the high voltage switch and the low voltage switch, the high voltage switch being further electrically coupled to the high voltage terminal, the low voltage switch being further electrically coupled to the low voltage terminal, the diagnostic system comprising:
a microcontroller having a microprocessor and an analog-to-digital converter, the microprocessor having a first boost mode monitoring application, a first boost mode diagnostic handler application, a second boost mode monitoring application, and a second boost mode diagnostic handler application;
the analog to digital converter measuring a first high voltage level at the high voltage terminal of the DC-DC voltage converter and generating a first high voltage value based on the first high voltage level;
the first boost mode monitor

Assignees

• Lg Chemical Ltd

Inventors

• Katrak Kerfegar K

Classifications

• H02M3/157

  with digital control · CPC title

• H02M3/04

  by static converters · CPC title

• G01R1/206

  Switches for connection of measuring instruments or electric motors to measuring loads (switches in general H01H) · CPC title

• H02M1/08

  Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters · CPC title

• H02M1/32

  Means for protecting converters other than automatic disconnection · CPC title