Three Phase Quasi-Z-Source Inverter

Description of the Three Phase Quasi-Z-Source Inverter component in the Schematic Editor Library.

A block diagram and input parameters for the Three Phase Quasi-Z-Source Inverter switching block are given in Table 1.

Table 1. Three Phase Quasi-Z-Source Inverter component in the Schematic Editor core library
component component dialog window component parameters
  • Property tabs
    • General
    • Passive elements
    • Measurements
    • Extras
Weight = 3

The Three Phase Quasi-Z-Source Inverter component models a voltage-fed quasi-Z-source inverter with a continuous input current, as shown in Figure 1. It should be noted that input inductor L1 should be added externally.

Figure 1. Schematic diagram of the voltage-fed Three Phase Quasi-Z-Source Inverter with a continuous input current

Control options

Selecting Digital inputs as the Control parameter enables assigning gate drive inputs to any of the digital input pins (from 1 to 32(64)). For example, if Phase A S1 is assigned to 1, the digital input pin 1 will be routed to the Phase A S1 switch gate drive. In addition, the gate_logic parameter selects either active high (High-level input voltage VIH turns on the switch), or active low (Low-level input voltage VIL turns on the switch) gate drive logic, depending on the external controller design.

Selecting Model, as the Control parameter, enables setting the IGBTs' gate drive signals directly from the signal processing model. The input pin gates appears on the component and requires a vector input of 6 gate drive signals for the switches. When controlled from the model, logic is always active high.

Component dialogue box and parameters

The Three Phase Quasi-Z-Source Inverter component dialogue box consists of three tabs:
  1. The General tab contains control-related properties.
  2. The Passive elements tab parameters are shown in Table 2.
    Table 2. Passive elements tab properties
    Property Code name Description
    L2 inductance L2 Inductance value of the internal L2 inductor. [H]
    L2 snubber resistor Rl2_snb Resistance value of the snubber resistor that is connected in parallel with L2 inductor (Rsnb in Figure 1). [Ω]
    C1 capacitance C1 Capacitance value of the internal C1 capacitor. [F]
    C1 ESR Rc1_esr Equivalent series resistance of the internal C1 capacitor. [Ω]
    C2 capacitance C2 Capacitance value of the internal C1 capacitor. [F]
    C2 ESR Rc2_esr Equivalent series resistance of the internal C2 capacitor. [Ω]
  3. The Measurements tab contains checkboxes that enable measurement of the switch current for each controllable switch, as well as the voltage measurements of the internal capacitors and the current measurement of the internal inductor.
  4. The Extras tab contains a property which enables the option to externally connect the battery in parallel with a C2 capacitor.

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.


  1. J. Anderson and F. Z. Peng, "Four quasi-Z-Source inverters", 2008 IEEE Power Electronics Specialists Conference, Rhodes, 2008, pp. 2743-2749, doi: 10.1109/PESC.2008.4592360.