esp32_ps_pwm

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Generate a Phase-Shift PWM Waveform using One of the ESP32 or ESP32-S3 MCPWM Hardware Modules

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# Phase-Shift PWM Waveform Generator using the ESP32 or ESP32-S3
Driver for the MCPWM hardware modules on the Espressif ESP32
or ESP32-S3 SoC for generating a Phase-Shift-PWM waveform between
two pairs of hardware pins.

Application in power electronics, e.g.
* Zero-Voltage-Switching (ZVS) Phase-Shift-PWM converters
* Full-Bridge or Dual-Active-Bridge
* Frequency-modulated LLC converters.

This depends on the ESP-IDF SDK source files.

* Tested up to ESP-IDF version 4.3-beta3
 * Currently not working with IDF v4.4 master branch, which is under work
 * Not compatible with ESP32-S2 as that chip has no MCPWM hardware module

## See example in examples subfolder

```
                            VDD
                     .---------------.
                     |               |
                  ||-+               +-||
      To  GPIO 26 ||<-               ->||To  GPIO 33
      ------------||-+               +-||-----------
                     |               |
                     |     LOAD      |
                     |      ___      |
  LEAD half-bridge   o-----|___|-----o   LAG half-bridge
                     |               |
                     |               |
                     |               |
                  ||-+               +-||
      To  GPIO 27 ||<-               ->||To  GPIO 25
      ------------||-+               +-||-----------
                     |               |
                     '---------------'
                            GND
```

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