Current sensing circuit

Details Current sensing circuit Current sensing circuit

1984-04-02

1985-11-12

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323314, 330257, G05F 316

Patent

active

045530840

ABSTRACT:
A current sensing circuit is disclosed wherein a small portion of a load current is sampled through a sensing resistor and a substantially larger portion of the load current is allowed to bypass the sensing resistor. A first high current vertical MOS transistor is coupled between the load and the ground terminal. A second vertical MOS transistor is coupled in series between the load and ground terminal. The transistors are constructed in a vertical MOS cellular construction whereby the first transistor comprises on the order of three-thousand cells and the second transistor comprises a single cell. A signal is taken across the sensing resistor and may be provided as feedback to a control means driving the first and second transistors for performing a current limiting or constant current function.

REFERENCES:
patent: 3887863 (1975-06-01), Brokaw
patent: 4055812 (1977-10-01), Rosenthal
patent: 4251743 (1981-02-01), Hareyama
McClellan, Andrew, "Current Source and 555 Timer Make Linear v-to-f Converter," Electronics, Jun. 10, 1976, pp. 108-109.

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