Current sensing circuit for pulse width modulated motor drive

Details Current sensing circuit for pulse width modulated motor drive Current sensing circuit for pulse width modulated motor drive

1997-03-19

1998-09-29

Berhane, Adolf

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 56, 363132, H02M 5257, H02H 700

Patent

active

058153918

ABSTRACT:
Inverter-switch currents are sensed using a conventional a-c current transformer whose primary winding is connected to the inverter-switch and whose secondary winding is connected to a signal-developing resistor. An a-c switch is driven by the inverter-switch timing signals and disconnects the output of the transformer when the inverter-switch is in an off state. Alternatively, a Rogowski coil senses the inverter-switch currents and delivers an output voltage that is proportional to the di/dt of the inverter-switch. An integrator is coupled to the output of the Rogowski coil and delivers a signal that represents the inverter-switch current. A reset circuit, responsive to the inverter-switch control signal, resets and holds the output of the integrator to zero during the off-time of the inverter-switch.

REFERENCES:
patent: 3558983 (1971-01-01), Steen
patent: 4063301 (1977-12-01), Lye
patent: 4482946 (1984-11-01), Bhagwat
patent: 4689733 (1987-08-01), Guth et al.
patent: 4980812 (1990-12-01), Johnson, Jr. et al.
patent: 5019952 (1991-05-01), Smolenski et al.
patent: 5177676 (1993-01-01), Inam et al.
patent: 5513089 (1996-04-01), Sudo et al.

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