Current sensing circuit
First Claim
1. A current sensing circuit comprising:
- a voltage detection unit for generating a detection voltage signal representative of a potential difference caused by a current to be detected;
a reference current generation unit for generating a first reference current and a second reference current such that a first linear relationship is established between the first and the second reference currents; and
a transfer unit coupled between the voltage detection unit and the reference current generation unit for determining a first operation voltage in response to the detection voltage signal and the first reference current, and fordetermining a second operation voltage and a transfer current in response to the first operation voltage and the second reference current such that the second operation voltage is substantially equal to the first operation voltage and a detection current signal is generated by subtracting at least the second reference current from the transfer current, wherein;
a second linear relationship is established between the detection current signal and the current to be detected.
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Accused Products
Abstract
A voltage detection unit generates a detection voltage signal representative of a potential difference caused by a current to be detected. A reference current generation unit generates a first reference current and a second reference current having a linear relationship therebetween. In response to the detection voltage signal and the first reference current, a transfer unit determines a first operation voltage. Furthermore, the transfer unit determines a second operation voltage and a transfer current in response to the first operation voltage and the second reference current. The second operation voltage is substantially equal to the first operation voltage. A detection current signal having a linear relationship with the current to be detected is generated through subtracting at least the second reference current from the transfer current.
36 Citations
20 Claims
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1. A current sensing circuit comprising:
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a voltage detection unit for generating a detection voltage signal representative of a potential difference caused by a current to be detected; a reference current generation unit for generating a first reference current and a second reference current such that a first linear relationship is established between the first and the second reference currents; and a transfer unit coupled between the voltage detection unit and the reference current generation unit for determining a first operation voltage in response to the detection voltage signal and the first reference current, and for determining a second operation voltage and a transfer current in response to the first operation voltage and the second reference current such that the second operation voltage is substantially equal to the first operation voltage and a detection current signal is generated by subtracting at least the second reference current from the transfer current, wherein; a second linear relationship is established between the detection current signal and the current to be detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of sensing a current comprising:
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generating a detection voltage signal representative of a potential difference caused by a current to be detected; generating a first reference current; generating a second reference current such that a first linear relationship is established between the first and the second reference currents; determining a first operation voltage in response to the detection voltage signal and the first reference current; determining a second operation voltage and a transfer current in response to the first operation voltage and the second reference current such that the second operation voltage is substantially equal to the first operation voltage; and generating a detection current signal by subtracting at least the second reference current from the transfer current such that a second linear relationship is established between the detection current signal and the current to be detected. - View Dependent Claims (17, 18, 19, 20)
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Specification