PWM Protocolos suportados

Robótica e indústria

Pulse Width Modulation

O que é PWM?

PWM (Pulse Width Modulation) is a digital signaling technique where information is encoded in the duty cycle (ratio of high time to total period) of a rectangular waveform. PWM is universally used in embedded systems for motor speed control, LED brightness dimming, servo positioning, power converter regulation, and DAC emulation. While PWM is not a communication protocol in the traditional sense, analyzing PWM signals is essential for verifying correct duty cycle, frequency, dead time in H-bridge configurations, and timing accuracy. Engineers debugging motor controllers, LED drivers, switching power supplies, and servo systems routinely need to measure PWM parameters and verify that the actual output matches the intended control signal.

PWM Referência rápida

type	Digital pulse
signals	Single-wire
features	Motor control, LED dimming, servo

Instrumentos Acute compatíveis com PWM

Soluções recomendadas

Recomendado para decodificação

TB3016F

Com canais analógicos

MSO2116E

Todos os produtos compatíveis

Decodificação de protocolo

Disparo por hardware

Emulador de protocolo

Série LA4000

Série MSO2000

Série MSO3000

Série TravelBus

Série TravelLogic

Série TravelScope

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Como analisar PWM com instrumentos Acute

Conecte seu analisador lógico Acute ao sinal de saida PWM na placa alvo.

Conecte um fio terra a referência de terra da placa alvo.

No software Acute, selecione o PWM analysis mode e atribua o sinal ao canal de entrada correspondente.

Configure os parametros esperados de frequency range and measurement parameters (duty cycle, frequency, period).

Capture and view PWM timing measurements including duty cycle percentage, frequency, high time, low time, and any deviations from the expected values.

Perguntas frequentes

Qual taxa de amostragem e necessária para a análise PWM ?

The required sample rate depends on the PWM frequency and the measurement resolution you need. For a 25 kHz PWM signal (common for motor control), sampling at 2.5 MHz gives 1% duty cycle resolution, and 25 MHz gives 0.1% resolution. For servo PWM at 50 Hz, 500 kHz is sufficient for microsecond-level timing. Higher sample rates provide finer duty cycle measurement granularity.

Por que minha medição de ciclo de trabalho PWM não corresponde ao que programei?

Discrepancies between programmed and measured PWM duty cycle can result from timer prescaler rounding errors in the microcontroller, output driver propagation delays, or loading effects on the PWM output. Use the logic analyzer to measure the actual high and low times precisely. Compare the measured period to the expected period to identify any frequency error, then check whether the duty cycle error is consistent (systematic) or varies (jitter-related).

Quantos canais são necessários para a análise de PWM ?

A single PWM signal requires 1 channel. For H-bridge motor control with complementary PWM and dead time, you need 2 channels (high-side and low-side). For 3-phase motor control (BLDC/PMSM), 6 channels cover all three phase pairs. Adding a channel for a direction or enable signal is often useful for correlating PWM with motor control commands.

Protocolos relacionados

UART

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