Pulse width modulator (PWM) system with low cost dead time disto

Details Pulse width modulator (PWM) system with low cost dead time disto Pulse width modulator (PWM) system with low cost dead time disto

1997-04-07

1998-06-09

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318811, 318254, H02P 610, H02P 729

Patent

active

057640246

ABSTRACT:
A pulse width modulator (PWM) system (100) detects several load current conditions to completely correct for the distortion caused by deadtime insertion when driving an inverter-fed inductive load, such as a three-phase AC motor. The system includes an inexpensive voltage sensor (140) which senses the output voltage at the end of each successive dead time interval in which neither a pullup transistor (51) nor a pulldown transistor (52) is driving. The system (100) includes a programmable PWM (125), two storage elements (131,132) such as D-type flip flops, and a memory-mapped register (133). The register stores the output of the flip-flops to indicate a near-zero load current condition. When it detects this condition, the system (100) changes the duty cycle of the PWM output signals to yield output voltages and currents which more closely approximate a sine wave. The system (100) is particularly useful as part of a low-cost microcontroller (120).

REFERENCES:
patent: 4454454 (1984-06-01), Valentine
patent: 4511809 (1985-04-01), Allen
patent: 4719555 (1988-01-01), Hattori et al.
patent: 4745991 (1988-05-01), Tanahashi
patent: 5448149 (1995-09-01), Ehsani et al.
patent: 5450306 (1995-09-01), Garces et al.
Motorola, "HC08 MC68HC708XL36 Technical Summary," HC708XL36TS/D Rev. 1, pp. 12-1-12/22 (1995).
Choi, Jong Woo, et al., Invertor Output Voltage Synthesis Using Novel Dead Time Compensation, Department of Electrical Engineering, Seoul National University; pp. 100-108 (1994).

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