Battery charge/discharge current detection apparatus

• US 8,041,523 B2
• Filed: 10/06/2008
• Issued: 10/18/2011
• Est. Priority Date: 11/19/2007
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Watanabe, Hidemitsu
• Primary Examiner(s): Schechter; Andrew
• Assistant Examiner(s): Huynh; Phuong
• Application Number:
  US12/285,454
• Publication Number:
  US 20090132188A1
• Time in Patent Office: 1,107 Days
• Field of Search: 702 63- 65, 702104-107, 702/188
• US Class Current: 702/64
• CPC Class Codes: G01R 31/007 using microprocessors or computers
• CPC Class Codes: G01R 31/2829 Testing of circuits in sensor or actuator systems testing of apparatus for measuring electric or magnetic variables G01R35/00; testing of indicating or recording apparatus G01D; in airbag systems B60R21/0173; checking gas analysers G01N33/007; monitoring or fail-safe circuits for electromagnets H01F7/1844
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The battery charge/discharge current detection apparatus has a power supply circuit powered by a battery mounted on a vehicle and configured to detect a charge/discharge current of the battery by use of a current detecting resistor connected between a negative terminal of the battery and a ground. The battery charge/discharge current detection apparatus includes a first function of detecting a voltage across the voltage detecting resistor, a second function of detecting a charge/discharge current of the battery on the basis of the voltage detected by the first function, a third function of detecting presence of an abnormality of the current detecting resistor, and a fourth function of informing an abnormality detected by the third function to the outside. The battery-side negative terminal of the power supply circuit is connected to the negative terminal of the battery.

Claims

1. A battery charge/discharge current detection apparatus having a power supply circuit powered by a battery mounted on a vehicle and configured to detect a charge/discharge current of the battery by use of a current detecting resistor connected between a negative terminal of the battery and a ground, the battery charge/discharge current detection apparatus comprising:

a first function of detecting a voltage across the current detecting resistor;

a second function of detecting a charge/discharge current of the battery on the basis of the voltage detected by the first function;

a third function of detecting presence of an abnormality of the current detecting resistor;

a fourth function of informing the abnormality detected by the third function to the outside;

a fifth function of forming a bypass of the current detecting resistor when the third function detects the abnormality of the current detecting resistor; and

a sixth function of producing a state where the voltage across the current detecting resistor is virtually zero, and performing a zero-point correction for the second function in the produced state;

wherein a battery-side negative terminal of the power supply circuit is connected to the negative terminal of the battery.

2. A battery charge/discharge current detection apparatus having a power supply circuit powered by a battery mounted on a vehicle and configured to detect a charge/discharge current of the battery by use of a current detecting resistor connected between a negative terminal of the battery and a ground, the battery charge/discharge current detection apparatus comprising:

a first function of detecting a voltage across the current detecting resistor;

a second function of detecting a charge/discharge current of the battery on the basis of the voltage detected by the first function;

a third function of detecting presence of an abnormality of the current detecting resistor;

a fourth function of informing the abnormality detected by the third function to the outside;

a fifth function of forming a bypass of the current detecting resistor when the third function detects the abnormality of the current detecting resistor; and

a sixth function of producing a state where the voltage across the current detecting resistor is virtually zero;

wherein a battery-side negative terminal of the power supply circuit is connected to the negative terminal of the battery.