Electronic device with overcurrent protection and method for overcurrent protection

Patent metadata

Field	Value
Publication number	US-11909195-B2
Application number	US-202017046133-A
Country	US
Kind code	B2
Filing date	Sep 1, 2020
Priority date	Sep 2, 2019
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

An electronic device having an overcurrent protection function is provided. The electronic device includes at least one power converter, the at least one power converter including a power conversion unit to convert input voltage or input current to supply output current, a control unit to adjust the output current, and an overcurrent protection unit to detect the output current and transmit a detection result to the control unit, and wherein the overcurrent protection unit includes an overcurrent extraction module to output a difference between the output current exceeding designated first reference current and the first reference current; a calculation module to calculate an accumulative value obtained by integrating the difference with respect to time, and a first comparison module to compare the accumulative value with a designated critical value and to transmit a first detection result in which the accumulative value exceeds the critical value to the control unit.

First claim

What is claimed is:

1. An electronic device comprising:
at least one power converter,
wherein the at least one power converter comprises:
a power conversion unit configured to convert an input voltage or an input current to supply an output current,
a control unit configured to adjust the output current, and
an overcurrent protection unit configured to detect the output current and transmit a detection result to the control unit, and

wherein the overcurrent protection unit comprises:
an overcurrent extraction module configured to output a difference between the output current exceeding a designated first reference current and the designated first reference current,
a calculation module configured to calculate an accumulative value obtained by integrating the difference with respect to time,
a first comparison module configured to:
compare the accumulative value with a designated critical value, and
transmit a first detection result in which the accumulative value exceeds the designated critical value to the control unit, and

a second comparison module configured to:
compare the output current with second reference current larger than the first reference current, and
transmit a second detection result in which the output current exceeds the second reference current to the control unit.

2. The electronic device of claim 1 , wherein the control unit is configured to stop the supply of the output current based on the first detection result or the second detection result.

3. The electronic device of claim 1 , wherein the control unit is configured to pause the supply of the output current so that the output current is re-supplied after a predetermined time elapses based on the first detection result or the second detection result.

4. The electronic device of claim 3 ,
wherein the at least one power converter further comprises a counter configured to count a number of times the supply of the output current is paused, and
wherein the control unit is further configured to:
pause the supply of the output current so that the output current is re-supplied after a predetermined time elapses based on the first detection result or the second detection result, and
stop the supply of the output current to prevent the output current from being re-supplied when the counted number of times exceeds a predetermined number of times.

5. The electronic device of claim 1 , wherein the overcurrent extraction module comprises a differential amplifier.

6. The electronic device of claim 5 , wherein the overcurrent extraction module further comprises an analog-to-digital converter (ADC).

7. An electronic device comprising:
at least one power converter,
wherein the at least one power converter comprises:
a power conversion unit configured to convert an input voltage or an input current to supply an output current, and
an overcurrent protection unit configured to:
detect the output current, and
transmit a detection result to the power conversion unit to adjust the output current, and

wherein the overcurrent protection unit comprises:
an overcurrent extraction module configured to output a difference between the output current exceeding a designated first reference current and the designated first reference current,
a calculation module configured to calculate an accumulative value obtained by integrating the difference with respect to time,
a first comparison module configured to:
compare the accumulative value with a designated critical value, and
transmit a first detection result in which the accumulative value exceeds the designated critical value to the power conversion unit, and

a second comparison module configured to:
compare the output current with second reference current larger than the first reference current, and
transmit a second detection result in which the output current exceeds the second reference current to the power conversion unit.

8. The electronic device of claim 7 , wherein the power conversion unit is configured to stop the supply of the output current based on the first detection result or the second detection result.

9. The electronic device of claim 7 , wherein the power conversion unit is configured to pause the supply of the output current so that the output current is re-supplied after a predetermined time elapses based on the first detection result or the second detection result.

10. The electronic device of claim 9 ,
wherein the at least one power converter comprises a counter configured to count a number of times the supply of the output current is paused, and
wherein the power conversion unit is configured to:
pause the supply of the output current so that the output current is re-supplied after a predetermined time elapses based on the first detection result or the second detection result, and
stop the supply of the output current to prevent the output current from being re-supplied when the counted number of times exceeds a predetermined number of times.

11. The electronic device of claim 7 , wherein the overcurrent extraction module comprises a differential amplifier.

12. The electronic device of claim 11 , wherein the overcurrent extraction module further comprises an analog-to-digital converter (ADC).

13. An overcurrent protection method of an electronic device, the method comprising:
converting an input voltage or an input current to supply an output current;
outputting a difference between the output current exceeding a designated first reference current and the designated first reference current;
calculating an accumulative value obtained by integrating the difference with respect to time;
comparing the accumulative value with a designated critical value and transmitting a first detection result in which the accumulative value exceeds the designated critical value; and
comparing the output current with second reference current larger than the first reference current and transmitting a second detection result in which the output current exceeds the second reference current.

14. The overcurrent protection method of claim 13 , further comprising:
stopping the output current based on the first detection result or the second detection result.

15. The overcurrent protection method of claim 13 , further comprising:
pausing the output current so that the output current is re-supplied after a predetermined time elapses based on the first detection result or the second detection result.

16. The overcurrent protection method of claim 13 , further comprising:
pausing the output current so that the output current is re-supplied after a predetermined time elapses based on the first detection result or the second detection result;
counting the number of times the supply of the output current is paused; and
stopping the supply of the output current to prevent the output current from being re-supplied when the counted number of times exceeds the predetermined number of times.

17. The overcurrent protection method of claim 13 , further comprising:
notifying that the output current is overcurrent requiring overcurrent protection based on the first detection result or the second detection result.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Jehwan

Classifications

• H02H3/087 Primary

  for DC applications · CPC title

• H02H1/003

  Fault detection by injection of an auxiliary voltage (same for detection of earth fault currents H02H3/17; for monitoring earth connection H02H5/105) · CPC title

• H02H3/0935

  the timing being determined by numerical means · CPC title

• H02M1/32 Primary

  Means for protecting converters other than automatic disconnection · CPC title

• G01R19/257

  using analogue/digital converters of the type with comparison of different reference values with the value of voltage or current, e.g. using step-by-step method · CPC title