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ST7MC1K2-Auto датащи(PDF) 187 Page - STMicroelectronics |
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ST7MC1K2-Auto датащи(HTML) 187 Page - STMicroelectronics |
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187 / 371 page ![]() Obsolete Product(s) - Obsolete Product(s) ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto On-chip peripherals 187/371 The shape of the output voltage (voltage, frequency, sinewave, trapezoid, ...) is completely managed by the application software, in charge of computing the compare values to be loaded for a given PWM duty-cycle (refer to Figure 77). Finally, the PWM modulated voltage generated by the power stage is smoothed by the motor inductance to get sinusoidal currents in the stator windings. The induction motor being asynchronous, there is no need to synchronize the rotor position to the sinewave generation phase in most of the applications. Part of the MTC dedicated to delay computation and event sampling can thus be reconfigured to perform speed acquisition of the most common speed sensor, without the need of an additional standard timer. This speed measurement timer with clear-on-capture and clock prescaler auto-setting allows to keep the CPU load to a minimum level while taking benefit of the embedded input comparator and edge detector. Figure 76. Complementary PWM generation for three-phase induction motor (1 phase represented) U event Compare preload register processing MCP0 MCPU PWM generator counter PWM ref signal MCO1 MCO0 Deadtime insertion Obsolete Product(s) - Obsolete Product(s) |
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