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Buck Converter

实施Buck Power转换器

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  • Buck Converter block

Description

TheBuck Converter块实现了降压电源转换器。您可以从四种模型类型中进行选择：

  • Switching devices— The converter is modeled with IGBT/diode pairs controlled by firing pulses produced by a PWM generator. This model provides the most accurate simulation results.

  • Switching function— The converter is modeled by a switching-function model. The switches are replaced with two voltage sources and two diodes on the AC side and with two current sources on the DC side.

    The converter is controlled by firing pulses produced by a PWM generator (0/1 signals) or by firing pulses averaged over a specified period (PWM averaging: signals between 0 and 1). Both modes of operation produce harmonics normally generated by a PWM-controlled converter and also correctly simulate rectifying operation as well as blanking time. This model type is well-suited for real-time simulation.

  • Average model (D-controlled)- 使用由占空比信号直接控制的开关功能模型对转换器进行建模（0

  • Average model (D-controlled, no rectifier mode)- 该块使用由参考电压直接控制的电压源来对转换器进行建模。该模型不需要PWM发生器，也不需要模拟整流器模式。此设置提供了最快的模拟。

    When doing real-time simulation, use theSwitching functionsetting with the firing pulses averaged, or theAverage model (D-controlled)或者Average model (D-controlled, no rectifier mode)settings.

Parameters

Model type

Specify the model type to use:

  • Switching devices(default)

  • Switching function

  • Average model (D-controlled)

  • Average model (D-controlled, no rectifier mode)

Device on-state resistance (Ohms)

Internal resistance of the switching devices, in ohms. This parameter is available only when you set theModel typeparameter toSwitching devices. The default value is1e-3.

Snubber resistance (Ohms)

The snubber resistance, in ohms. Set the snubber resistance toinfto eliminate the snubbers. This parameter is available only when you set theModel typeparameter toSwitching devices. The default value is1e6.

缓冲电容（F）

The snubber capacitance, in farads. Set the snubber capacitance to0to eliminate the snubbers. This parameter is available only when you set theModel typeparameter toSwitching devices. The default value isinf.

正向电压[设备VF（V），二极管VFD（V）]

The forward voltage of the switching device and of the diode, in volts. This parameter is available only when you set theModel typeparameter toSwitching devices. The default value is[0,0].

Diode on-state resistance (Ohms)

Internal resistance of the diodes, in ohms. This parameter is available only when you set theModel typeparameter toSwitching function或者Average model (D-controlled). The default value is1e-3.

Diode snubber resistance (Ohms)

The snubber resistance, in ohms. Set the snubber resistance toinfto eliminate the snubbers. This parameter is available only when you set theModel typeparameter toSwitching function或者Average model (D-controlled). The default value is1e6.

Diode snubber capacitance (F)

The snubber capacitance, in farads. Set the snubber capacitance to0to eliminate the snubbers. This parameter is available only when you set theModel typeparameter toSwitching function或者Average model (D-controlled). The default value isinf.

Diode forward voltage (V)

Forward voltage, in volts, across the diode when it is conducting. This parameter is available only when you set theModel typeparameter toSwitching function或者Average model (D-controlled). The default value is1e-3.

Current source snubber resistance (Ohms)

The snubber resistance across the two current sources, in ohms. Set the snubber resistance toinfto eliminate the snubbers. This parameter is available only when you set theModel typeparameter toSwitching function或者Average model (D-controlled). The default value isinf.

Inputs and Outputs

g

发射脉冲信号以控制转换器。仅当您设置该端口Model typeparameter toSwitching devices或者Switching function.

D

The duty cycle signal (a value between 0 and 1) used to control the converter. This port is visible only when you set theModel typeparameter toAverage model (D-controlled).

BL

You can block all firing pulses to the converter by applying a signal value of 1 at the BL input.

+

The positive electrical terminal of the converter. This port is an electrical conserving port.

–

The negative electrical terminal of the converter. This port is an electrical conserving port.

1

The output electrical terminal of the converter. This port is an electrical conserving port.

Examples

See thePower Converters Modeling Techniquesexample for a comparison of the three converter modeling techniques.

Version History

在R2015B中引入