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NONLINEAR CONTROL CHARACTERISTICS OF PWM FOUR-QUADRANT CHOPPERS IN CURRENT CONTROL LOOPS
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| Author(s) |
Rolf-Dieter Klug |
| Abstract |
This paper describes the effects of the switching dead times - protecting the power switches by avoiding a bridge leg short circuit in PWM amplifiers - on the control characteristic first generally for one bridge leg (2-quadrant d.c. chopper), then for circuits with two (4-quadrant d.c. chopper) and three (3-phase inverter) bridge legs at resistive-inductive-active load operation. The effect of the resulting ambiguous and non-linear control characteristic on the current control loop is shown exemplary for the 4-quadrant d.c. chopper. A signal processing correction circuit for the PWM control signal is presented to get a definite and linear behaviour of the mentioned bridge amplifiers. The results are shown at a 4-quadrant d.c. chopper. |
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| Filename: | Unnamed file |
| Filesize: | 3.767 MB |
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| Type |
Members Only |
| Date |
Last modified 2021-02-01 by System |
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