Boost Converter
Controller-driven DC-DC step-up voltage regulator
- Library:
Simscape / Electrical / Semiconductors & Converters / Converters
Description
The Boost Converter block represents a converter that steps up DC voltage as driven by an attached controller and gate-signal generator. Boost converters are also known as step-up voltage regulators because they increase voltage magnitude.
The Boost Converter block allows you to model an asynchronous converter with one switching device or a synchronous converter with two switching devices. Options for the type of switching devices are:
GTO — Gate turn-off thyristor. For information about the I-V characteristic of the device, see GTO.
Ideal semiconductor switch — For information about the I-V characteristic of the device, see Ideal Semiconductor Switch.
IGBT — Insulated-gate bipolar transistor. For information about the I-V characteristic of the device, see IGBT (Ideal, Switching).
MOSFET — N-channel metal-oxide-semiconductor field-effect transistor. For information about the I-V characteristic of the device, see MOSFET (Ideal, Switching).
Thyristor — For information about the I-V characteristic of the device, see Thyristor (Piecewise Linear).
Averaged Switch — Semiconductor switch with an anti-parallel diode. The control signal port, G, accepts values in the
[0,1]
interval. When the value at port G is equal to0
or1
, the averaged switch is either fully opened or fully closed, and it behaves similarly to the Ideal Semiconductor Switch block with an anti-parallel diode. When the value at port G is between0
and1
, the averaged switch is partly opened. You can then average the PWM signal over a specified period. This allows for undersampling of the model or using modulation waveforms instead of PWM signals.
Model Gate Control Port
You can model this converter as an asynchronous converter with a physical signal gate control port or with two electrical control ports, or as a synchronous converter with an electrical control port. To select the gate control port, set the Modeling option parameter to either:
PS control port
— Asynchronous converter with a physical signal port.Electrical control ports
— Asynchronous converter with one positive and one negative electrical conserving port. To control switching device gates using Simscape™ Electrical™ blocks, select this option.Synchronous converter
— Synchronous converter with an electrical conserving port.
The asynchronous boost converter models contain an inductor, a switching device, a diode, and an output capacitor.
The synchronous boost converter model contains an inductor, two switching devices, and an output capacitor.
In each case, the capacitor smoothes the output voltage.
Protection
For the synchronous converter model, you can include an integral protection diodes. Integral diodes protect the semiconductor device by providing a conduction path for reverse current. An inductive load can produce a high reverse-voltage spike when the semiconductor device suddenly switches off the voltage supply to the load.
To include and configure the internal protection diodes, use the Diode parameters. This table shows how to set the Model dynamics parameter based on your goals.
Goals | Value to Select | Integral Protection Diode | |
---|---|---|---|
Do not include protection. | None | None | |
Include protection. | Prioritize simulation speed. | Diode with no dynamics | The Diode block |
Prioritize model fidelity by precisely specifying reverse-mode charge dynamics. | Diode with charge dynamics | The dynamic model of the Diode block |
You can also include a snubber circuit for each switching device. Snubber circuits contain a series-connected resistor and capacitor. They protect switching devices against high voltages that inductive loads produce when the device turns off the voltage supply to the load. Snubber circuits also prevent excessive rates of current change when a switching device turns on.
To include and configure a snubber circuit for each switching device, use the Snubbers parameters.
Gate Control
To connect gate-control voltage signals to the gate ports of the switching devices, for the:
PS control port model:
Convert a Simulink® gate-control voltage signal to a physical signal using a Simulink-PS Converter block.
Connect the Simulink-PS Converter block to the G port.
Electrical control ports model:
Connect a Simscape electrical-domain positive DC voltage signal to the G+ port.
Connect the Simscape electrical-domain negative DC voltage signal to the G- port.
Synchronous converter model:
Convert each Simulink gate-control voltage signal to a physical signal using Simulink-PS Converter blocks.
Multiplex the converted gate-control signals into a single vector using a Two-Pulse Gate Multiplexer.
Connect the vector signal to the G port.
Variables
Use the Variables settings to specify the priority and initial target values for the block variables before simulation. For more information, see Set Priority and Initial Target for Block Variables.
Assumptions and Limitations
Only a PWM-driven averaged switch converter captures both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). A duty cycle-driven averaged switch converter captures CCM only.
Ports
Input
Conserving
Parameters
References
[1] Trzynadlowski, A. M. Introduction to Modern Power Electronics, 2nd Edition. Hoboken, NJ: John Wiley & Sons Inc., 2010.
[2] Han, D. and B. Sarlioglu, "Deadtime Effect on GaN-Based Synchronous Boost Converter and Analytical Model for Optimal Deadtime Selection." IEEE Transactions on Power Electronics.Vol. 31, Number 1, 2016, pp 601-612.
Extended Capabilities
Version History
See Also
Average-Value DC-DC Converter | Bidirectional DC-DC Converter | Buck Converter | Buck-Boost Converter | Converter (Three-Phase) | GTO | IGBT (Ideal, Switching) | MOSFET (Ideal, Switching) | Ideal Semiconductor Switch | PWM Generator | PWM Generator (Three-phase, Two-level) | Six-Pulse Gate Multiplexer | Three-Level Converter (Three-Phase) | Thyristor (Piecewise Linear)