Electronic apparatus and method of calculating input power value of power supply unit in electronic apparatus

• US 8,456,149 B2
• Filed: 06/22/2011
• Issued: 06/04/2013
• Est. Priority Date: 11/16/2010
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Tokunaga, Tomoaki
• Primary Examiner(s): Hollington, Jermele M
• Application Number:
  US13/166,696
• Publication Number:
  US 20120112735A1
• Time in Patent Office: 713 Days
• Field of Search: None
• US Class Current: 324/76.11
• CPC Class Codes: G01R 21/133 by using digital technique

Abstract

According to one embodiment, an electronic apparatus includes a power supply unit, a current value calculator, and an input power value calculator. The current value calculator is configured to calculate a current value on a power supply cable led out from the power supply unit based on a voltage between two ends of the power supply cable and a resistance value of the power supply cable. The input power value calculator is configured to calculate an input power value of the power supply unit based on the current value on the power supply cable calculated by the current value calculator and an input/output characteristic (efficiency) of the power supply unit.

Claims

1. An electronic apparatus comprising:

a power supply module;

a current value calculator to calculate a current value on a power supply cable led out from the power supply module based on a potential difference between two ends of the power supply cable and a resistance value of the power supply cable; and

an input power value calculator to acquire efficiency of the power supply module from the current value calculated by the current value calculator and to calculate an input power value of the power supply module based on a previously-given input/output characteristic of the power supply module.

2. The apparatus of claim 1, further comprising:

a voltage monitoring line to monitor a voltage value at an end of the power supply cable on the power supply module side; and

a potential difference detector to measure a voltage value at a terminal end of the power supply cable connected to a load side, and to detect the potential difference between the two ends of the power supply cable based on the measured voltage value at the terminal end of the power supply cable and the voltage value at the power supply end of the power supply cable obtained via the voltage monitoring line.

3. The apparatus of claim 1, wherein the input power value calculator is to calculate an output power value of the power supply module based on the current value on the power supply cable calculated by the current value calculator and the potential difference between the two ends of the power supply cable, and to calculate the input power value of the power supply module based on the calculated output power value of the power supply module according to the input/output characteristic of the power supply module.

4. The apparatus of claim 1, further comprising a potential difference detector to measure a voltage value at a terminal end of the power supply cable connected to a load side, and to detect the potential difference between the two ends of the power supply cable based on the measured voltage value at the terminal end of the power supply cable and a rated output voltage value at a non-output time of the power supply module.

5. The apparatus of claim 4, wherein the input power value calculator is to calculate an output power value of the power supply module based on the current value on the power supply cable calculated by the current value calculator and the potential difference between the two ends of the power supply cable, and to calculate the input power value of the power supply module based on the calculated output power of the power supply module according to the input/output characteristic of the power supply module.

6. The apparatus of claim 1, further comprising:

a signal line to receive a voltage value of a power supply end of the power supply cable on the power supply module side; and

a potential difference detector to measure a voltage value at a terminal end of the power supply cable connected to a load side, and to detect the potential difference between the two ends of the power supply cable based on the measured voltage at the terminal end of the power supply cable and the voltage value of the power supply end of the power supply cable received via the signal line.

7. The apparatus of claim 6, wherein the input power value calculator is to calculate an output power value of the power supply module based on the current value on the power supply cable calculated by the current value calculator and the potential difference between the two ends of the power supply cable, and to calculate the input power value of the power supply module based on the calculated output power value of the power supply module according to the input/output characteristic of the power supply module.

8. A method of calculating an input power value of a power supply module in an electronic apparatus, the method comprising:

calculating a current value on a power supply cable led out from the power supply module based on a potential difference between two ends of the power supply cable and a resistance value of the power supply cable; and

acquiring efficiency of the power supply module from the calculated current value and calculating an input power value of the power supply module, based on a previously-given input/output characteristic of the power supply module.

9. The method of claim 8, further comprising:

monitoring a voltage value at a power supply end of the power supply cable on the power supply module side; and

measuring a voltage at a terminal end of the power supply cable connected to a load side, and detecting the potential difference between the two ends of the power supply cable based on the measured voltage value at the terminal end of the power supply cable and the voltage value at the power supply end of the power supply cable obtained by the monitoring.

10. The method of claim 8, wherein the calculating the input power value of the power supply module is to calculate an output power value of the power supply module based on the calculated current value on the power supply cable and the potential difference between the two ends of the power supply cable, and to calculate the input power value of the power supply module based on the calculated output power value of the power supply module according to the input/output characteristic of the power supply module.

11. The method of claim 8, further comprising measuring a voltage at a terminal end of the power supply cable connected to a load side, and detecting the potential difference between the two ends of the power supply cable based on the measured voltage value at the power supply end of the power supply cable and a rated output voltage value at a non-output time of the power supply module.

12. The method of claim 11, wherein the calculating the input power value of the power supply module is to calculate an output power value of the power supply module based on the calculated current value on the power supply cable and the potential difference between the two ends of the power supply cable, and to calculate the input power value of the power supply module based on the calculated output power of the power supply module according to the input/output characteristic of the power supply module.

13. The method of claim 8, further comprising:

receiving a voltage value of a power supply end of the power supply cable on the power supply module side; and

measuring a voltage value at a terminal end of the power supply cable connected to a load side, and to detect the potential difference between the two ends of the power supply cable based on the measured voltage value at the terminal end of the power supply cable and the received voltage value of the end of the power supply cable.

14. The method of claim 13, wherein the calculating the input power value of the power supply module is to calculate an output power value of the power supply module based on the calculated current value on the power supply cable and the potential difference between the two ends of the power supply cable, and to calculate the input power value of the power supply module based on the calculated output power value of the power supply module according to the input/output characteristic of the power supply module.