Engee documentation

Average-Value Chopper

Average Chopper.

average value chopper

Description

The Average-Value Chopper unit is an averaging chopper (converter). Use the Duty Cycle input to convert electrical power between the two sides.

The figure shows the equivalent circuit of the block.

average value chopper

Equations

The input current and output voltage depend on the selected chopper class.

Equations for voltage and current

Chopper class

Quadrants

Output voltage,

Input current,

A

B

C

и

D

и

E

Limitations and assumptions

  • The input voltage is positive.

  • Energy losses can be neglected.

  • The Average-Value Chopper block is an ideal realisation of a controlled average-value chopper without dynamics and is suitable for approximate calculations.

Ports

Input

DutyCycle - duty cycle
scalar

Port associated with the inverter duty cycle.

Data types: Float64.

Non-directional

1+ - left positive terminal
scalar

Electrical port associated with the positive terminal of the first DC voltage.

1- - left negative terminal
scalar

Electrical port associated with the negative terminal of the first DC voltage.

2+ is the right positive terminal
scalar

Electrical port associated with the positive terminal of the second DC voltage.

2- is the right negative terminal
scalar

Electrical port associated with the negative terminal of the second DC voltage.

Parameters

Chopper type - chopper class
Class A - first quadrant | Class B - second quadrant | Class C - first and second quadrant | Class D - first and fourth quadrant | Class E - four quadrant (by default)

Chopper Class.

Converter efficiency - Converter efficiency characteristic.
Constant (By default) | Tabulated

Specify the converter efficiency characteristic.

When Tabulated is set, the conduction loss will depend on the output current provided.

Extrapolation by nearest neighbour method is used to calculate the efficiency from the data in the table. Therefore, the efficiency cannot be higher than the highest or lower than the lowest value in the Efficiency vector (%).
Efficiency (%) is the efficiency of the inverter
100 (By default) | scalar

Inverter efficiency in per cent.

Dependencies

To enable this parameter, set Converter efficiency to Constant.

Output current vector - output current vector
`[0, 2, 5] A (by default)| a vector of strings with at least two elements

Output current vector.

Dependencies

To enable this parameter, set Converter efficiency to Tabulated.

Efficiency vector (%) - efficiency vector
[90, 95, 98] (by default) | a string vector of at least two elements

The efficiency vector for each output current specified in the Output current vector parameter, in per cent.

This parameter must have the same number of elements as the output current vector.

Dependencies

To enable this parameter, set Converter efficiency to Tabulated.