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Knowledge base » Software reference » DO-PWM – Direct output PWM

DO-PWM – Direct output PWM

ByBenoît Steinmann Updated on SD011

The Direct output PWM block sets PWM output(s) directly to ‘0’ or ‘1’.

This technique is typically used for Model-Predictive Control (MPC) or Direct Torque Control (DTC). An example of an application is shown in DTC of a Permanent Magnet Synchronous Motor.

Like the other PWM blocks, the Direct output PWM block supports dead-time generation and can be activated or deactivated. More information is available on the PWM page.

Simulink block

Signal specification

  • The input in sets the PWM output to ‘1′ (in>0) or to ‘0’ (in<=0)
  • The input A allows the activation (>0) or deactivation (<=0) of the PWM output(s).
  • The output(s) is/are the generated PWM signal(s), according to the selected output mode. The output(s) is/are only used in simulation.

Parameters

  • Device ID selects which B-Box/B-Board to address when used in a multi-device configuration.
  • Output mode selects between a single PWM signal or complementary signals with a deadtime.
  • Addressed PWM selects the PWM outputs to address.
  • Show ”activate” input makes the A signal input visible. If not checked, the block is active by default.
  • Dead-time duration: configures the dead-time duration if the Output mode is set at Dual (PWM_H + PWM_L).

PLECS block

Signal specification

  • The input in sets the PWM output to ‘1′ (in>0) or to ‘0’ (in<=0)
  • The input A allows the activation (A>0) or deactivation (A<=0) of the PWM output(s).
  • The target outport(s) (only visible at the atomic subsystem level) is/are the generated PWM signal(s), according to the selected output mode. The output(s) is/are only used in simulation.

Parameters

  • Device ID selects which B-Box/B-Board to address when used in a multi-device configuration.
  • Output mode selects between a single PWM signal or complementary signals with a deadtime.
  • Output lane(s) or Output channel(s) (vectorizable) selects the PWM outputs to address.
  • PWM activation makes the A signal input visible if the option “Use block input“ is selected. If not, the CB-PWM block is activated by default.
  • Dead-time duration configures the dead-time duration if the Output mode is set at Dual (PWM_H + PWM_L).

C++ functions

Functions specific to the direct-output PWM

void DoPwm_SetOn(tPwmOutput output, unsigned int device=0);

Code language: C++ (cpp)

Sets the PWM output to ‘1′.

Parameters

  • output: the PWM channel or lane to address
  • device: the id of the addressed device (optional, used in multi-device configuration only)
void DoPwm_SetOff(tPwmOutput output, unsigned int device=0);

Code language: C++ (cpp)

Sets the PWM output to ‘0’.

Parameters

  • output: the PWM channel or lane to address
  • device: the id of the addressed device (optional, used in multi-device configuration only)

Functions common to all PWM drivers

These functions are common to all PWM blocks. Further documentation is available on the PWM page.

void DoPwm_ConfigureOutputMode(tPwmOutput output, tPwmOutMode outMode, unsigned int device=0);
Code language: C++ (cpp)

Selects the PWM output mode.

If the output mode selected is COMPLEMENTARY, a dead-time must be configured using the CbPwm_ConfigureDeadTime() function.

It has to be called in UserInit().

Parameters

  • output: the PWM channel or lane to address
  • outMode: the output mode to use (COMPLEMENTARY, INDEPENDENT or PWMH_ACTIVE)
  • device: the B-Box/B-Board to address when used in a multi-device configuration
void DoPwm_ConfigureDeadTime(tPwmOutput output, float deadTime, unsigned int device=0);
Code language: C++ (cpp)

Configures the dead-time duration if the output mode is set as COMPLEMENTARY.

It has to be called in UserInit().

Parameters

  • output: the PWM channel or lane to address
  • outMode: the output mode to use (COMPLEMENTARY, INDEPENDENT or PWMH_ACTIVE)
  • device: the B-Box/B-Board to address when used in a multi-device configuration
void DoPwm_Activate(tPwmOutput output, unsigned int device=0);

Code language: C++ (cpp)

Activates the addressed PWM output(s). If the addressed PWM output has been set as COMPLEMENTARY or PWMH_ACTIVE this function acts on both outputs.

It can be called in UserInit() or in the control interrupt routine.

Parameters

  • output: the PWM channel or lane to address
  • device: the B-Box/B-Board to address when used in a multi-device configuration
void DoPwm_Deactivate(tPwmOutput output, unsigned int device=0);
Code language: C++ (cpp)

Deactivates the addressed PWM output(s). If the addressed PWM output has been set as COMPLEMENTARY or PWMH_ACTIVE this function acts on both outputs.

It can be called in UserInit() or in the control interrupt routine.

Parameters

  • output: the PWM channel or lane to address
  • device: the B-Box/B-Board to address when used in a multi-device configuration

Benoit is the head of software development. On the knowledge base, he is the author of numerous software reference documents.

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