Push - Pull Converter

A block diagram and input parameters for the Push-Pull Converter switching blocks is given in Table 1.

Table 1. The Push-Pull Converter component in the Schematic Editor core library

component	component dialog window	component parameters
Push-Pull		General tab: Control (Digital inputs, Internal modulator, Model) S1 (digital input selection for switch S1) S1_logic (active high, active low) S2 (digital input selection for switch S2) S2_logic (active high, active low) Gate control enabling (allows an external digital signal to enable switching) Sen (digital input selection for gate control) Transformer tab: Number of turns of the primary (n1) Number of turns of the secondary winding (n2) Weight = 1

A schematic block diagram of the Push-Pull switching block is given in Figure 1 with its corresponding switch arrangement and naming. It consists of an Ideal Transformer, two IGBTs, and two diodes.

Digital inputs, when selected as the Control parameter, enables gate drive inputs to be assigned to any of the digital input pins (from 1 to 32). 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 gate_logic parameter is set to either active high (i.e. high-level input voltage which turns on the VIH switch) or active low (i.e. low-level input voltage which turns on the VIL switch). The gate drive logic depends on the external controller design under test.

The Internal modulator, when selected as the Control parameter, enables the internal PWM modulator to drive the S1 and S2 switches instead of the digital input pins. In this configuration, two additional component inputs will be present. The En input is used to enable/disable PWM modulator control, while In is used as the reference signal input for the internal PWM modulator.

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

Currents through the diodes can be found in the list of analog outputs by names shown in Analog output variable naming for the Push-Pull switching block (internal to the component).

Analog output variable naming for the Push-Pull switching block (internal to the component)

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.