BLDC Average-Value Inverter

Compute three-phase trapezoidal AC voltage from inverter DC voltage

Since R2023a

• 

Libraries:
Motor Control Blockset / Electrical Systems / Inverters

Description

The BLDC Average-Value Inverter block models an average-value and full-wave inverter. It computes the three-phase trapezoidal voltage output from the inverter DC voltage by using the six duty cycles corresponding to six inverter switches.

Equations

These equations describe how the block computes the three-phase AC voltage.

$$V_a=V_{dc}\times \left(D_a-D_{a\text{'}}\right)$$

$$V_b=V_{dc}\times \left(D_b-D_{b\text{'}}\right)$$

$$V_c=V_{dc}\times \left(D_c-D_{c\text{'}}\right)$$

where:

• D_a, D_b, D_c, D_a', D_b', and D_c' are the duty cycles (ranging between 0 and 1) corresponding to the six switches of the inverter (shown in the figure).

• $$V_a$$, $$V_b$$, and $$V_c$$ are the output three-phase trapezoidal voltages (volts).

• V_dc is the DC bus voltage of the inverter (volts).

Examples

Six-Step Commutation of BLDC Motor Using Sensor Feedback

Use six-step commutation technique to control speed and direction of rotation of a three-phase BLDC motor.

• Open Model

Ports

Input

D_sw — Duty cycles corresponding to six inverter switches

1-by-6 array

Six duty cycles in the range [0, 1] for generating the three-phase voltages that run the motor.

Data Types: single | double | fixed point

V_dc — Inverter DC voltage

scalar

DC bus voltage input to the inverter.

Data Types: single | double | fixed point | uint8 | uint16 | uint32

Output

V_abc — Three-phase voltage output

1-by-3 array

Three-phase trapezoidal voltage (Volts) corresponding to the input duty cycles that runs the motor.

Data Types: single | double | fixed point

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.

Version History

Introduced in R2023a