Control system for controlling operational modes of a DC-DC voltage converter

Patent metadata

Field	Value
Publication number	US-9935552-B2
Application number	US-201715651005-A
Country	US
Kind code	B2
Filing date	Jul 17, 2017
Priority date	Aug 18, 2016
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

A control system for controlling operational modes of a DC-DC voltage converter is provided. The DC-DC voltage converter initially has an idle operational mode. The microcontroller having first and second operational mode applications. The first operational mode application determines a first encoded value based on the first operational mode value, and further determines first and second values based on the first encoded value. The second operational mode application determines a second encoded value based on the first operational mode value, and further determines third and fourth values based on the second encoded value. The first operational mode application induces the DC-DC voltage converter to transition to the first operational mode if the second value is equal to the third value.

First claim

What is claimed is:

1. A control system for controlling operational modes of a DC-DC voltage converter, the DC-DC voltage converter having a first bi-directional switch and a second bi-directional switch, the DC-DC voltage converter initially having an idle operational mode, the control system comprising:
a microcontroller receiving a first operational mode message from a communication bus, the first operational mode message having a first operational mode value therein indicating that the DC-DC voltage converter is being commanded to transition to a first operational mode, the first operational mode not being the idle operational mode;
the microcontroller having a first operational mode application and a second operational mode application;
the first operational mode application determining a first encoded value based on the first operational mode value, and further determining first and second values based on the first encoded value;
the second operational mode application determining a second encoded value based on the first operational mode value, and further determining third and fourth values based on the second encoded value; the second encoded value being different than the first encoded value;
the first operational mode application inducing the DC-DC voltage converter to transition from the idle operational mode to the first operational mode if the second value is equal to the third value; and
the second operational mode application inducing the DC-DC voltage converter to transition from the idle operational mode to the first operational mode if the first value is equal to the fourth value.

2. The control system of claim 1 , wherein:
the microcontroller has a memory device with first and second mode tables and the first and second check tables; the first mode table having a first record with a first encoded mode value therein, the second mode table having a first record with a first encoded mode value therein, the first check table having a first record with first and second check mode values therein, the second check table having a first record with first and second check mode values therein;
the first value being the first check mode value from the first record of the first check table; the second value being the second check mode value from the first record of the first check table; the third value being the first check mode value from the first record of the second check table; the fourth value being the second check mode value from the first record of the second check table;
the first encoded value being the first encoded mode value in the first record of the first mode table;
the second encoded value being the first encoded mode value in the first record of the second mode table;
the first operational mode application obtaining the first encoded mode value from the first record of the first mode table utilizing the first operational mode value;
the first operational mode application obtaining the first and second check mode values from the first record of the first check table utilizing the first encoded mode value from the first mode table;
the second operational mode application obtaining the first encoded mode value from the first record of the second mode table utilizing the first operational mode value;
the second operational mode application obtaining the first and second check mode values from the first record of the second check table utilizing the first encoded mode value from the second mode table; and
the first operational mode application inducing the DC-DC voltage converter to transition from the idle operational mode to the first operational mode if the second check mode value from the first record of the first check table is equal to the first check mode value from the first record of the second check table.

3. The control system of claim 2 , wherein the second operational mode application inducing the DC-DC voltage converter to transition from the idle operational mode to the first operational mode if the first check mode value from the first record of the first check table is equal to the second check mode value from the first record of the second check table.

4. The control system of claim 2 , wherein:
the first operational mode application further determining if a lower nibble of the second check mode value from the first record of the first check table is equal to a lower nibble of the first check mode value from the first record of the second check table, and if so, then:
the microcontroller further receiving a first voltage signal from a first voltage sensor on a high voltage end of the second bi-directional switch;
the microcontroller further receiving a second voltage signal from a second voltage sensor on a low voltage end of the second bi-directional switch; and
the first operational mode application further setting an open operational flag equal to a true value if a difference between the first and second voltage signals is greater than a first threshold voltage level indicating the second bi-directional switch has an open operational state.

5. The control system of claim 2 , wherein the first and second check mode values from the first record of the first check table have a Hamming distance of two from one another.

6. The control system of claim 2 , wherein the first and second check mode values from the first record of the second check table have a Hamming distance of two from one another.

7. The control system of claim 1 , further comprising:
a contactor electrically coupled between a first battery and the first bi-directional switch of the DC-DC voltage converter; and
the microcontroller operably coupled to the first bi-directional switch and the second bi-directional switch of the DC-DC voltage converter, and the contactor.

8. The control system of claim 7 , wherein the idle operational mode corresponds to the first bi-directional switch being in an open operational state, and the second bi-directional switch being in the open operational state, and the contactor being in a closed operational state.

9. The control system of claim 7 , wherein the first operational mode corresponds to a buck operational mode in which the first bi-directional switch has a closed operational state, and the second bi-directional switch has the closed operational state, and the contactor has the closed operational state.

10. The control system of claim 7 , wherein the first operational mode corresponds to a buck special operational mode in which the first bi-directional switch has a closed operational state, and the second bi-directional switch has the closed operational state, and the contactor has an open operational state.

11. The control system of claim 7 , wherein the first operational mode corresponds to a boost operational mode in which the first bi-directional switch has a closed operational state, and the second bi-directional switch has the closed operational state, and the contactor has the open operational state.

12. The control system of claim 7 , wherein the first operational mode corresponds to an off operational mode in which the first bi-directional switch has an open operational state, and the second bi-directional switch has the open operational state, and the contactor has the open operational state.

13. The control system of claim 1 , wherein
the microcontroller has a memory device with first and second mode tables and the first and second check tables; the first mode table having a first record with a first encoded mode value therein, the second mode table having a first record with a first encoded mode value therein, the first check table having a first record with first and second check mode va

Assignees

• Lg Chemical Ltd

Inventors

• Katrak Kerfegar K

Classifications

• H02J2207/20

  Charging or discharging characterised by the power electronics converter · CPC title

• H02M3/33584

  Bidirectional converters · CPC title

• H02M3/1582 Primary

  Buck-boost converters (H02M3/1584 takes precedence) · CPC title

• H02M3/1584

  with a plurality of power processing stages connected in parallel · CPC title

• H02J7/0065

  Electricity · mapped topic