CURRENT DETECTING CIRCUIT

• US 20160356825A1
• Filed: 05/17/2016
• Published: 12/08/2016
• Est. Priority Date: 06/08/2015
• Status: Abandoned Application

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Bae, JeongGuk, K.V., Sundaraaman
• Application Number:
  US15/157,168
• Publication Number:
  US 20160356825A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01R 1/203 Resistors used for electric measuring, e.g. decade resistors standards, resistors for comparators, series resistors, shunts resistors in general H01C; microwave or radiowave terminations H01P1/26; coupling devices H01R
• CPC Class Codes: G01R 15/146 Measuring arrangements for current not covered by other subgroups of G01R15/14, e.g. using current dividers, shunts, or measuring a voltage drop if no voltage isolation is involved G01R1/203 or G01R19/0092
• CPC Class Codes: G01R 17/02 Arrangements in which the value to be measured is automatically compared with a reference value
• CPC Class Codes: G01R 19/0092 measuring current only all subgroups of G01R19/00 take precedence
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC
• CPC Class Codes: H02H 7/18 for batteries; for accumulators
• CPC Class Codes: H03F 1/26 Modifications of amplifiers to reduce influence of noise generated by amplifying elements
• CPC Class Codes: H03F 2200/462 the current being sensed
• CPC Class Codes: H03F 2203/45548 the IC comprising one or more capacitors as shunts to earth or as short circuit between inputs
• CPC Class Codes: H03F 3/45475 using IC blocks as the active amplifying circuit
• CPC Class Codes: H03F 3/45928 using IC blocks as the active amplifying circuit
• CPC Class Codes: H05K 1/0268 for electrical inspection or testing

Abstract

A current detecting circuit includes: a shunt resistor; an amplifier; a first signal line connecting a first terminal of the shunt resistor to a first input terminal of the amplifier; a second signal line connecting a second terminal of the shunt resistor to a second input terminal of the amplifier; and a third signal line connecting the second terminal of the shunt resistor to a first power supply terminal of the amplifier.

Claims

1. A current detecting circuit, comprising:

a shunt resistor;

an amplifier;

a first signal line connecting a first terminal of the shunt resistor to a first input terminal of the amplifier;

a second signal line connecting a second terminal of the shunt resistor to a second input terminal of the amplifier; and

a third signal line connecting the second terminal of the shunt resistor to a first power supply terminal of the amplifier.

2. The current detecting circuit of claim 1, further comprising:

a first capacitor connecting the first signal line to the third signal line; and

a second capacitor connecting the second signal line to the third signal line.

3. The current detecting circuit of claim 2, wherein:

a pattern of the third signal line is between a pattern of the first signal line and a pattern of the second signal line.

4. The current detecting circuit of claim 3, wherein:

an impedance of the first signal line is matched with an impedance of the second signal line.

5. The current detecting circuit of claim 4, wherein:

an impedance of the third signal line is matched with the impedance of the first signal line and the impedance of the second signal line.

6. The current detecting circuit of claim 5, wherein:

the impedances of the first, second, and third signal lines is determined according to a shape of each signal line pattern.

7. The current detecting circuit of claim 2, wherein:

a capacitance of the first capacitor and a capacitance of the second capacitor are determined according to a frequency value of an environmental noise.

8. The current detecting circuit of claim 7, wherein:

the capacitance of the first capacitor and the capacitance of the second capacitor have a same value.

9. The current detecting circuit of claim 3, wherein:

a second power supply terminal of the amplifier is connected to a fixed voltage source; and

a voltage applied to the second power supply terminal is larger than a voltage applied to the first power supply terminal.

10. The current detecting circuit of claim 3, wherein:

the shunt resistor is positioned on a high current path of a battery protective circuit.

11. The current detecting circuit of claim 10, wherein:

a polarity of both voltages of the shunt resistor when the battery protective circuit is in a charge mode is different from a polarity of the both voltages of the shunt resistor when the battery protective circuit is in a discharge mode.

12. The current detecting circuit of claim 3, wherein:

an output of the amplifier is input to an analog to digital converter (ADC), and

a current flowing in the shunt resistor is measured according to an output of the ADC.

13. The current detecting circuit of claim 1, wherein:

the first power supply terminal is a ground terminal.