Power consumption management system

• US 9,207,266 B2
• Filed: 03/30/2012
• Issued: 12/08/2015
• Est. Priority Date: 03/31/2011
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Shibuya, Tenda
• Primary Examiner(s): Phan, Huy Q
• Assistant Examiner(s): Lee, Thang
• Application Number:
  US14/008,526
• Publication Number:
  US 20140015514A1
• Time in Patent Office: 1,348 Days
• Field of Search: 324/76.11, 324/764.01, 324/140, 324/127, 324/509, 702/62
• US Class Current: 1/1
• CPC Class Codes: G01R 15/09 Autoranging circuits
• CPC Class Codes: G01R 19/0092 measuring current only all subgroups of G01R19/00 take precedence

Abstract

A power consumption management system includes: a main part that is connected to a power line; a breaker that is electrically connected to the main part, and limits a current supplied to a load to a predetermined set value; a sensor unit including a current sensor and a signal processing part. The current sensor measures a current supplied from the main part to the breaker, and outputs a current detection signal based on the measured current. The signal processing part receives the current detection signal over a predetermined time, determines a range of a signal level from the received current detection signal, and adjusts an input range of the current detection signal in accordance with the determination result.

Claims

1. A power consumption management system comprising:

a main part that is connected to a power line;

a breaker that is electrically connected to the main part, and limits a current supplied to a load to a predetermined set value; and

a sensor unit including a current sensor and a signal processing part,

wherein the current sensor measures a current supplied from the main part to the breaker, and outputs a current detection signal based on the measured current,

the signal processing part receives the current detection signal over a predetermined time, determines a range of a signal level from the received current detection signal, and adjusts an input range of the current detection signal in accordance with the determination result,

the current sensor includes a core that produces an induced current by a current that is supplied from the main part to the breaker, and a secondary coil that detects the induced current, and

the signal processing part includes a resistance circuit including a plurality of resistors having different resistance values, the resistors being connected in parallel, the resistors being connected in series with the secondary coil, the signal processing part adjusting the input range of the current detection signal to an optimum value by selecting any one of the resistors.

2. The power consumption management system according to claim 1, wherein the main part is provided in a plurality in a mutually parallel manner, and the breaker has a plurality of concave parts that are fitted to the main parts to be connected to a power supply of any phase.

3. The power consumption management system according to claim 1, wherein the current sensor is attached to the branch part of the main part bar where the breaker is installed.

4. A power consumption management system comprising:

a main part that is connected to a power line;

a breaker that is electrically connected to the main part, and limits a current supplied to a load to a predetermined set value; and

a sensor unit including a current sensor and a signal processing part,

wherein the current sensor measures a current supplied from the main part to the breaker, and outputs a current detection signal based on the measured current, and

the signal processing part receives the current detection signal over a predetermined time, determines a range of a signal level from the received current detection signal, and adjusts an input range of the current detection signal in accordance with the determination result,

the current sensor includes a core that produces an induced current by a current that is supplied from the main part to the breaker, and a secondary coil that detects the induced current; and

the signal processing part includes a variable resistance circuit that is connected in series with the secondary coil, the signal processing part adjusting the input range of the current detection signal to an optimum value by changing a resistance value of the variable resistance circuit.