Flying Capacitor Boost

Schematic Block Diagram

A schematic block diagram of the flying capacitoor boost converter switching block is given in Figure 2 with correspsonding switch arrangement and naming.

The Electrical tab allows for the use of two additional diodes in the schematic. If Use additional diodes is selected two additional diodes are added to the model, as shown in Figure 3.

Weight of the Flying Capacitor Boost for real-time/VHIL simulation is 1. If Use additional diodes is selected, weight of the Flying Capacitor Boost for real-time/VHIL simulation is 2.

Control

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 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 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 design of the external controller. In TyphoonSim, digital signals are read from the internal virtual IO bus. Hence, if some signal is sent to digital ouput 1, it will appear on digital input 1.

Selecting Internal modulator as the Control parameter, enables use of the internal PWM modulator for driving S1 and S2 switches instead of digital input pins. In this configuration, three additional component inputs will be present. The En input is used to enable/disable the internal PWM modulator, while In1 and In2 are used as a reference signal input. There are two PWM modulators with a 180 degree phase shift between their corresponding triangular carriers. In1 is a reference signal for the PWM modulator that controls the switch S1, while In2 is a reference signal for the PWM modulator that controls the switch S2.

Selecting Model as the Control parameter, enables setting of the IGBTs gate drive signals directly from the signal processing model. The input pin gates appears on the component. It is a 2-element vector input, where the first value (index 0) controls the S1 gate and the second value (index 1) controls the S2 gate. When controlled from the model, logic is always active high.

PESB Optimization

The PESB Optimization option is available in certain converter models. When PESB Optimization is enabled, all converter's short circuit state space modes will be merged and treated as the same state space mode. For example, if one converter leg within the three phase converter is short circuited and PESB Optimization is enabled, all of the legs within the three phase converter will also be short circuited. This simplification for short circuit modeling can save a significant amount of matrix memory.

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.

Ports

• In+
  • DC input + port

• In-\Out-
  • DC input - port and converter DC output - port
• Out+
  • Converter DC output + port
• C+
  • Flying capacitor + port
• C-
  • Flying capacitor - port
• N
  • Available if Use additional diodes is selected
  • Converter neutral point port
• s_ctrl (in)
  • Available if model control is selected
  • 2-element (vector) input gate signal for switches
• En (in)
  • Available if Internal modulator control is selected
  • Used to enable/disable internal modulator
• In1 (in)
  • Available if Internal modulator control is selected
  • Used to specify modulation signal value for internal modulator that controlls S1
• In2 (in)
  • Available if Internal modulator control is selected
  • Used to specify modulation signal value for internal modulator that controlls S2
• Freq (in)
  • Available if Internal modulator control is selected and Variable carrier frequency is selected as the modulator's operation mode
  • Used to specify modulator's carrier frequency

Control (Tab)

Electrical (Tab)

• Use additional diodes
  • Allows use of additional diodes, as shown in Figure 3

Advanced (Tab)

• PESB Optimization
  • PESB Optimization is specific for optimization of real-time simulation and it is not applied to TyphoonSim at all. Changing its value will not affect TyphoonSim simulation at all.
  • Enables/disables PESB optimization. More details can be found in the dedicated PESB Optimization section.

Extras (Tab)