IC output circuit based on a pulse width modulating system

Details IC output circuit based on a pulse width modulating system IC output circuit based on a pulse width modulating system

1999-05-05

2000-08-08

Nguyen, Matthew

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

H02M 744

Patent

active

061011126

ABSTRACT:
A current path for a discharge current leading from ground to a motor is provided when a pulse width modulation (PWM) control is OFF, with a parasitic diode between a P type substrate of an NPN transistor and an N type collector region. A diode with a cathode and an anode connected to a base and an emitter of an NPN transistor is also provided, so that when the PWM control is OFF, a base current is conducted by the diode to the NPN transistor, whereby a current flows from the emitter of the NPN transistor to the collector, providing a current path for the discharge current from the motor to a power terminal.

REFERENCES:
patent: 5753964 (1998-05-01), Yashita et al.
patent: 5874817 (1999-02-01), Yashita et al.
patent: 5877602 (1999-03-01), Knodoh et al.
patent: 5877950 (1999-03-01), Bonsignour et al.
patent: 5952856 (1999-09-01), Horiguchi et al.

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