Power conversion device

Patent metadata

Field	Value
Publication number	US-10630194-B2
Application number	US-201615549115-A
Country	US
Kind code	B2
Filing date	Feb 17, 2016
Priority date	Feb 20, 2015
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

A power conversion device includes an input current sensor, an input voltage sensor, a power converter, an output voltage sensor for detecting an output voltage from the power converter, an output current sensor for detecting an output current value from the power converter, and a controller for controlling the power converter. The controller obtains an allowable current value that can be accepted from an external alternating current power source, and, controls the power converter so that the input current value does not exceed the allowable current value based on an input current value detected by the input current sensor. The controller detects an abnormality in the power conversion device based on the input current value, the input voltage, the output current value, the output voltage, and power conversion efficiency of the power converter.

First claim

The invention claimed is:

1. A power conversion device for converting alternating current power into direct current power to supply the direct current power to a load, the power conversion device comprising:
an input current sensor configured to detect an input current value of the alternating current power;
an input voltage sensor configured to detect an input voltage value of the alternating current power;
a power converter configured to convert the input alternating current power into the direct current power;
an output current sensor configured to detect an output current value from the power converter;
an output voltage sensor configured to detect an output voltage value from the power converter; and
a controller configured to:
obtain an allowable current value of the alternating current power that can be accepted,
control the power converter so that the input current value does not exceed the allowable current value, based on the input current value detected by the input current sensor,
calculate a power conversion efficiency of the power converter based on the input current value, the input voltage value, the output current value, and the output voltage value,
compare the calculated power conversion efficiency with a predetermined power conversion efficiency,
determine that an abnormality exists in the power conversion device upon detecting that the calculated power conversion efficiency is greater than the predetermined power conversion efficiency,
upon determining that the abnormality exists in the power conversion device, control turning on and off of a switching element included in the power converter so that the input current value reduces as the calculated power conversion efficiency increases, and
set an upper limit value of the input current value that is smaller than the allowable current value so that the input current value reduces as the calculated power conversion efficiency increases.

2. The power conversion device according to claim 1 , wherein the controller is further configured to obtain the allowable current value based on a pilot signal supplied together with the alternating current power.

3. The power conversion device according to claim 1 , wherein the controller is further configured to control the power converter to lower power supplied to the load upon determining that the abnormality exists in the power conversion device.

4. The power conversion device according to claim 1 , wherein, upon detecting that the calculated power conversion efficiency is smaller than the predetermined power conversion efficiency, the controller is further configured to control the power converter to supply greater power to the load than power supplied when the calculated power conversion efficiency is greater than the predetermined power conversion efficiency.

5. A power conversion device for converting alternating current power into direct current power to supply the direct current power to a load, the power conversion device comprising:
an input current sensor configured to detect an input current value of the alternating current power;
an input voltage sensor configured to detect an input voltage value of the alternating current power;
a power converter configured to convert the input alternating current power into the direct current power;
an output current sensor configured to detect an output current value from the power converter;
an output voltage sensor configured to detect an output voltage value from the power converter; and
a controller configured to:
obtain an allowable current value of the alternating current power that can be accepted,
control the power converter so that the input current value does not exceed the allowable current value, based on the input current value detected by the input current sensor,
calculate a power conversion efficiency of the power converter based on the input current value, the input voltage value, the output current value, and the output voltage value,
compare the calculated power conversion efficiency with a predetermined power conversion efficiency,
determine that an abnormality exists in the power conversion device upon detecting that the calculated power conversion efficiency is greater than the predetermined power conversion efficiency,
upon determining that the abnormality exists in the power conversion device, control turning on and off a switching element included in the power converter so that the input current value reduces as the calculated power conversion efficiency increases, and
upon determining that the abnormality exists in the power conversion device, set an upper limit value of the input current value to reduce the input current value as the calculated power conversion efficiency increases, the upper limit value being smaller than the allowable current value.

6. The power conversion device according to claim 5 ,
wherein the controller is further configured to obtain the allowable current value based on a pilot signal supplied together with the alternating current power.

7. The power conversion device according to claim 5 ,
wherein the controller is further configured to control the power converter to lower power supplied to the load upon determining that the abnormality exists in the power conversion device.

8. The power conversion device according to claim 5 ,
wherein, upon detecting that the calculated power conversion efficiency is smaller than the predetermined power conversion efficiency, the controller is further configured to control the power converter to supply greater power to the load than power supplied when the calculated power conversion efficiency is greater than the predetermined power conversion efficiency.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Iisaka Atsushi
• Ishiguro Tetsuya

Classifications

• H02J7/06

  using discharge tubes or semiconductor devices · CPC title

• H02M3/28

  using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC · CPC title

• H02M7/12 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

• H02J2007/10

  Electricity · mapped topic