Knowledge base » Software reference » TPI SV-PWM – Helper block

TPI SV-PWM – Helper block

BySimon Strobl August 24, 2023August 31, 2023 Updated onAugust 31, 2023 SD205

Table of Contents

The TPI SV-PWM helper block is a wrapper that simplifies the use of the SV-PWM block with the all-in-one programmable inverter (TPI8032 22kW). Since the topology of the converter is fixed, the channel assignment and part of the modulators’ configuration are known beforehand.

The topology of the converter and the connection of the PWM channels are shown below. To prevent short-circuiting the DC bus, the upper and lower leg switches always use pseudo-complementary signals with a fixed dead-time of 124 ns. This value was chosen as low as possible to minimize the distortion introduced by the dead-time.

PWM channel	PWM lane	Description
0	0	PWM High – Phase A (M0)
	1	PWM Low – Phase A (M0)
1	2	PWM High – Phase B (M1)
	3	PWM Low – Phase B (M1)
2	4	PWM High – Phase C (M2)
	5	PWM Low – Phase C (M2)

PWM channels and lanes assignment

The TPI SV-PWM helper block is available starting from version 3.9 of the SDK. The TPI8032 is required to use this driver.

Simulink SV PWM helper block

Signal specification

The input αβ0 is the normalized reference vector in the stationary reference frame (-1.15 to 1.15).
The input signal > is the clock input and must be connected to the CONFIG block or to an independent CLK.
The input A allows the activation (>0) or deactivation (<=0) of the PWM outputs.
The sim output is a vector corresponding to the six generated PWM signals (phase A high and low, phase B high and low, and phase C high and low). They are only used in simulation.

While each component of the normalized reference vector can be in the range [-1.15; 1.15], the norm of that vector must be in the range [0; 1.15]. The limitation of the norm is further explained in SVPWM vs SPWM modulation techniques (TN146). In addition, the page Space Vector Modulation (TN145) presents a way to take this limitation into account in a closed-loop control algorithm.

Parameters

Device ID selects which TPI to address when used in a multi-device configuration.
Show "activate" input makes the A input visible. If not checked, the TPI CB-PWM block is active by default.
PWM parameters update rate selects when the duty-cycle parameter is applied.
- Single-rate: it is applied at the end of the carrier period.
- Double-rate: it is applied twice per carrier period: when the carrier reaches its lowest point and when it reaches its highest point. (for TRIANGLE and INVTRIANGLE carriers only)
Simulate dead-time toggles the option to simulate the effect of the dead-time.

Modulation parmeters mask for the SV PWM helper block

PLECS SV PWM helper block

Signal specification

The input αβ0 is the normalized reference vector in the stationary reference frame (-1.15 to 1.15).
The input signal > is the clock input and must be connected to the CONFIG block or to an independent CLK.
The input A allows the activation (>0) or deactivation (<=0) of the PWM outputs.
The target output port (only visible at the atomic subsystem level) is a vector corresponding to the six generated PWM signals (phase A high and low, phase B high and low, and phase C high and low). They are only used in simulation.

Parameters

Device ID selects which TPI to address when used in a multi-device configuration.
Show "activate" input makes the A input visible. If not checked, the TPI CB-PWM block is active by default.
PWM parameters update rate selects when the duty-cycle parameter is applied.
- Single-rate: it is applied at the end of the carrier period.
- Double-rate: it is applied twice per carrier period: when the carrier reaches its lowest point and when it reaches its highest point. (for TRIANGLE and INVTRIANGLE carriers only)
Simulate dead-time toggles the option to simulate the effect of the dead-time.