Three Level Buck

Description of the Three Level Buck converter in Schematic Editor.

A block diagram and input parameters for the Three Level Buck converter are given in Table 1.

Table 1. Three Level Buck converter component in the Schematic Editor core library
component component dialog window component properties
  • General
    • Control (Digital inputs, Model)
    • S1 (digital input selection for switch S1)
    • S2 (digital input selection for switch S2)
    • S3 (digital input selection for switch S3)
    • S4 (digital input selection for switch S4)
    • gate_logic (active high, active low)
    • Gate control enabling (enables usage of external digital signal to enable the switching)
    • Sen (digital input selection for PWM enable)
    • Sen_logic (active high, active low)
    Weight = 1

Digital inputs, when selected as the Control parameter, enables you to assign gate drive inputs to any of the digital input pins. For example, if S1 is assigned to 1, the digital input pin 1 will be routed to the S1 switch gate drive. In addition, the S1_logic parameter is set to either active high (i.e. high-level input voltage VIH which turns on the switch), or active low (i.e. low-level input voltage VIL which turns on the switch). The gate drive logic depends on your external controller design.

Model, when selected as the Control parameter, enables you to set the IGBTs gate drive signals directly from signal processing model. The input pin gates appears on the component. It is a single vector input of four gate drive signals in the following order: [S1, S2, S3, S4]. When controlled from the model, logic is always set to active high.

Gate control enabling, when checked, enables using an external PWM enabling digital signal.

Figure 1. A schematic block diagram of a Three Level Buck converter component with corresponding switch naming

Digital Alias

If a converter is controlled by digital inputs, an alias for every digital input used by the converter will be created. Digital input aliases will be available under the Digital inputs list alongside existing Digital input signals. The alias will be shown as Converter_name.Switch_name, where Converter_name is name of the converter component and Switch_name is name of the controllable switch in the converter.