Power supply device with current limit based on output current and input voltage

Patent metadata

Field	Value
Publication number	US-9647525-B2
Application number	US-201314773316-A
Country	US
Kind code	B2
Filing date	Mar 21, 2013
Priority date	Mar 21, 2013
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

A power supply device includes a first inverter that converts a first direct-current voltage into a first alternating-current voltage and outputs the first alternating-current voltage, and a second inverter that has an output connected in series with an output of the first inverter and converts a second direct-current voltage into a second alternating-current voltage synchronized with the first alternating-current voltage and outputs the second alternating-current voltage.

First claim

The invention claimed is:

1. A power supply device, comprising:
a first inverter that converts a first direct-current voltage into a first alternating-current voltage based on a switching operation of a plurality of first switching elements forming a first bridge circuit and outputs the first alternating-current voltage; and
a second inverter that converts a second direct-current voltage into a second alternating-current voltage synchronized with the first alternating-current voltage based on a switching operation of a plurality of second switching elements forming a second bridge circuit and outputs the second alternating-current voltage,
wherein the first inverter has:
a first limiter value setting part that sets a first limiter value;
a first peak limiter circuit that inhibits the first switching elements from performing the switching operation when a value that is responsive to an output current reaches the first limiter value, and makes the first switching elements perform the switching operation when the value that is responsive to the output current is lower than the first limiter value; and
a first controlling part that increases the first limiter value based on an increase of the value that is responsive to the output current and the first direct-current voltage, and
the second inverter has:
a second limiter value setting part that sets a second limiter value;
a second peak limiter circuit that inhibits the second switching elements from performing the switching operation when the value that is responsive to the output current reaches the second limiter value, and makes the second switching elements perform the switching operation when the value that is responsive to the output current is lower than the second limiter value; and
a second controlling part that increases the second limiter value based on an increase of the value that is responsive to the output current and the second direct-current voltage.

2. The power supply device according to claim 1 , wherein the first limiter value setting part sets the first limiter value, which is positive, and a third limiter value, which is negative,
the first peak limiter circuit inhibits the first switching elements from performing the switching operation when the value that is responsive to the output current reaches the first limiter value or the third limiter value, and makes the first switching elements perform the switching operation when the value that is responsive to the output current is lower than the first limiter value and higher than the third limiter value,
the first controlling part increases the first limiter value and reduces the third limiter value based on the increase of the value that is responsive to the output current and the first direct-current voltage,
the second limiter value setting part sets the second limiter value, which is positive, and a fourth limiter value, which is negative,
the second peak limiter circuit inhibits the second switching elements from performing the switching operation when the value that is responsive to the output current reaches the second limiter value or the fourth limiter value, and makes the second switching elements perform the switching operation when the value that is responsive to the output current is lower than the second limiter value and higher than the fourth limiter value, and
the second controlling part increases the second limiter value and reduces the fourth limiter value based on the increase of the value that is responsive to the output current and the second direct-current voltage.

3. The power supply device according to claim 2 , wherein the first controlling part increases the first limiter value and reduces the third limiter value when a state where the value that is responsive to the output current is equal to or higher than a first predefined current value previously determined and the first direct-current voltage is equal to or higher than a first predefined voltage value previously determined lasts for a first predefined time previously determined, and
the second controlling part increases the second limiter value and reduces the fourth limiter value when a state where the value that is responsive to the output current is equal to or higher than a second predefined current value previously determined and the second direct-current voltage is equal to or higher than a second predefined voltage value previously determined lasts for the first predefined time.

4. The power supply device according to claim 3 , wherein the first predefined current value is higher than a rated current value of the first and second inverters and equal to or lower than the first limiter value, and
the second predefined current value is higher than the rated current value and equal to or lower than the second limiter value.

5. The power supply device according to claim 3 or 4 , wherein the first controlling part reduces the first limiter value and increases the third limiter value when a state where the value that is responsive to the output current is equal to or higher than the first predefined current value and the first direct-current voltage is lower than the first predefined voltage value lasts for a second predefined time previously determined, and
the second controlling part reduces the second limiter value and increases the fourth limiter value when a state where the value that is responsive to the output current is equal to or higher than the second predefined current value and the second direct-current voltage is lower than the second predefined voltage value lasts for the second predefined time.

6. The power supply device according to any one of claims 3 to 5 , wherein the first controlling part reduces the first limiter value and increases the third limiter value when a state where the value that is responsive to the output current is lower than the first predefined current value lasts for a third predefined time previously determined, and
the second controlling part reduces the second limiter value and increases the fourth limiter value when a state where the value that is responsive to the output current is lower than the second predefined current value lasts for the third predefined time.

7. The power supply device according to any one of claims 3 to 6 , wherein the first controlling part changes the first and third limiter value within respective previously determined ranges, and
the second controlling part changes the second and fourth limiter values within respective previously determined ranges.

8. The power supply device according to any one of claims 3 to 7 , wherein the first inverter has a first protecting circuit that turns off the first and second switching elements when a state where the value that is responsive to the output current reaches the first limiter value or the third limiter value lasts for a previously determined short-circuit detection time or when the first direct-current voltage is equal to or higher than a first overvoltage detection value previously determined,
the first overvoltage detection value is higher than the first predefined voltage value,
the second inverter has a second protecting circuit that turns off the first and second switching elements when a state where the value that is responsive to the output current reaches the second limiter value or the fourth limiter value lasts for the short-circuit detection time or when the second direct-current voltage is equal to or higher than a second overvoltage detection value previously determined, and
the second overvoltage detection value is higher than the second predefined voltage value.

9. The power supply device according to any one of claims 3 to 8 , wherein the first inverter has a first current-volt

Assignees

• Shindengen Electric Mfg
• Honda Motor Co Ltd

Inventors

• Imai Naoya
• Ikeda Masataka
• Yamaguchi Yasukazu
• Eguchi Hiroyuki
• Fujikawa Go

Classifications

• H02M1/00 Primary

  Details of apparatus for conversion · CPC title

• H02M7/53871

  with automatic control of output voltage or current · CPC title

• H02M7/48 Primary

  using discharge tubes with control electrode or semiconductor devices with control electrode · CPC title

• H02M1/32

  Means for protecting converters other than automatic disconnection · CPC title

• H02M2001/0003

  Electricity · mapped topic