DC-DC converter modeling toolbox :TIS

The presented toolbox can be used to solve the steady-state and small signal model of DC/DC converters. By Jia Yao, Alexandera Abramovitz

This toolbox can be used to model an extensive range of DC-DC converters conviniently. By substitituion of the (G)TIS block into the problem circuit in a point-to-point manner, the steady-state solution and the small signal model of the swtiching converter can be attained promptly. Moreover the controller design can be very convinient. By applying the linear network analysis toolbox to the established TIS model of the circuit, controller can be designed visually in an graphic environment. Detailed description follows.

The TIS (tapped inductor switcher) as shown below offers a generalized methodology to model various tapped inductor/transformer converters with different winding configurations [7]. The simple inductor can be regarded as a trivial case of the switched tapped inductor with unity winding ratio, a=1.[1][3]

Fig.1 The three terminal TIS (tapped inductor switcher) module [7]

Operation steps:

1) : Identify the (G)TIS block in the problem circuit, mark the port numbers, and determine the TIS parameters [1][3][7]

Fig. 2 An example: identify TIS in TI-Boost converter

2) : Determine the connection of the external linear network, establish the circuit model with TIS block

3) : Choose the appropriate TIS tool depended on the operation mode (CCM or DCM, considering leakage or not, current mode control....). Adding the external linear network branches accordingly.

FIg.3 An example: TIS model of TI-Boost converter (CCM)

4): Attain the steady state solution of the circuit

FIg.4 An example: steady-sate solution of TI-Boost converter (CCM)

5): Attain the small signal model of the circuit

FIg.5 An example: the small signal model of TI-Boost converter (CCM)

6): Controller design if needed

FIg.6 An example: controller design of TI-Boost converter (CCM)

The category and directory description of the toolbox:

Due to the behavior of the switching converter varies with different operation/modulation scheme, the (G)TIS Tool includes several different models which can cover Current continuous mode (TIS); Discontinous current mode (TIS_DCM); high-order DC-DC converters (GTIS); tapped inductor converter with considering leakage and lossy snubbers (TIS_Lk); current mode control (will be added soon).

Each TIS model tool contains a steady-state model tool, a small signal model tool, a description file and an example file.

Detailed Introduction to the directory:

1) : TIS_CCM can be employed to model PWM DC-DC converter in CCM mode.

2) : TIS_DCM can be employed to model PWM DC-DC converter in DCM mode.

3) : TIS_C can be employed to model PWM DC-DC converter with considering leakage and clamp circuit.

4) : GTIS can be employed to model high-order PWM DC-DC converters with regular inductor, tapped inductor or transformer.

5) : GTIS_C can be employed to model high order PWM DC-DC converter with considering leakage and clamp circuit.

More tools will be added soon.

This work was supported by the National Natural Science Foundation of China under Grant 51707096.