+  1 Introduction
 +  2 Start a Power Supply Design
 +  3 Component Finder
 +  4 Project Management
 +  5 Loss Analysis
 +  6 Waveform Analysis
 +  7 Monte Carlo Analysis
 +  8 Loop Analysis
 +  9 Thermal Analysis
 +  10 Life & MTBF Analysis
 +  11 BOM - BOM Builder
 +  12 DVT Reports
 +  13 Magnetic Builder
 +  14 Add Parts
 +  15 Report Builder
 +  16 Harmonic
 +  17 EMI Analysis
 +  18 Component Builder
 +  19 Smart Optimizer
 +  20 General Function in PowerEsim
      21 Troubleshooting
 +  22 PowerEsim Account Management
      23 PowerEsim Terms of use
 +  24 User Interface Practice
Better Than Real - Free Switch Mode Power Supply Circuit (SMPS) Design Software & Transformer Calculation / Simulation Tool.
PowerEsim User Manual
PowerEsim is a free web-based software providing power supply (SMPS) design, transformer design, magnetic design, loss analysis, thermal analysis, waveform analysis, MTBF analysis, BOM building, DVT analysis and optimization of power supply (SMPS). Click to try PowerEsim (www.powerEsim.com)




8 Loop Analysis Back to top
 1 YouTube



8.1 Loop Analysis Back to top



8.1.1 What is Loop Analysis? Back to top
Loop analysis is a tool that allows the user to arbitrarily draw a transfer function by varying the coefficient or component from the feedback block. On the other hand, curve fitting can be done by entering points of expected gain or expected phase, by pressing "Automatic Compensation", and so the coefficient of the transfer function or components will be changed to fit those points.

8.1.2 How to start Loop Analysis as a Standalone Tool Back to top
Click on "Loop & Stability" on the left main menu to start Loop Analysis.


8.1.3 Introduction to Interface (Standalone Tool) Back to top
  1. Top Bar
  2. Change transfer function coefficients (ai and bi)
  3. Define the range of each coefficient for Automatic Compensation
  4. Loop Chart
  5. Enter Transient Analysis Page


8.1.3.1 Top Bar Back to top
The Generic transfer function is shown in the top bar.
For other functions in the top bar, please refer to Session 9.3.7--Top bar.





8.1.3.2 Change transfer function coefficients (ai and bi) Back to top
Users can input ai and bi and set the number of parameters by setting n., where n is the order of the transfer function.


8.1.3.3 Define the range of each coefficient for Automatic Compensation Back to top
The range of ai and bi should be specified for curve fitting purpose. For coefficients which users may not want to be changed by our non-linear regression curve fitting engine, users can simply uncheck the box as shown above.

After modification, click [Automatic Compensation] to apply the new value.


8.1.3.3.1 Compensation Setting Back to top
Click on [Compensation Setting]. Users can set the expected Gain and Phase at different frequencies, then click [close] to close this window and click on [Automatic Compensation].


8.1.3.4 Loop Chart Back to top
After Automatic Compensation, a non-linear regression curve fitting will change ai and bi values to fit the expected gain and expect phase to be as close as possible. The adjusted ai and bi are shown on the parameter setting interface.

On the right, users can change the fmin and fmax.
Information about the gain margin, phase margin and cross-over frequency are shown on the right of the loop chart.


8.1.3.5 Enter Transient Analysis Page Back to top
Click [Transient Analysis] to enter the transient analysis page.

For more details about Transient Analysis, please refer to Session 8.2--Transient Analysis.


8.1.4 How to start Loop Analysis with topology Back to top
Click on "Loop & Stability" on the left main menu to start Loop Analysis.


8.1.5 Introduction to Interface (With Topology) Back to top
  1. Top Bar
  2. Change Expected Value for Automatic Compensation
  3. Component List
  4. Loop Chart
  5. Enter Transient Analysis Page


8.1.5.1 Top Bar Back to top
Please refer to Session 9.5.1--Top bar.

8.1.5.2 Automatic Compensation Back to top
Users can change the expected DC gain, phase margin and cross-over frequency for automatic compensation.
After the new values have been inputted, click [Apply] or [Automatic Compensation] to update.


8.1.5.2.1 Compensation Setting Back to top
Click on [Compensation Setting].
On the Compensation Setting page, enable [Use Advance Setting] in order to enable the input box at the bottom. Users can then set the expected Gain and Phase at different frequencies. Then, click [close] to close this window and click on [Automatic Compensation].


8.1.5.3 Component List Back to top
In the component list, the range of automatic compensation for each component is shown.
To change the component, click the blue button with the designator on the left to enter the component finder page.


8.1.5.4 Loop Chart Back to top
After Automatic Compensation, a non-linear regression curve fitting will change the ai and bi values to fit the expected gain and expect phase as close as possible. The adjusted ai and bi are shown on the parameter setting interface.

On the right, users can change the fmin and fmax.
Information about loop analysis are shown on the right of the loop chart.


8.1.5.5 Enter Transient Analysis Page Back to top
Click [Transient Analysis] to enter the transient analysis page.

For more details about Transient Analysis, please refer to Session 8.2--Transient Analysis.


8.2 Transient Analysis Back to top



8.2.1 What is Transient Analysis? Back to top
Transient Analysis is a tool simulating the output voltage response under a user defined loading current profile. The tool has a simplistic interface allowing users to use a set of points to define the current loading profile by current level at different times. The tool will combine a small signal approach and large signal analysis to simulate the output voltage change against time.

If the user has already selected a design, this tool will inherently retrieve all necessary parameters from the design and show the corresponding result at just the click of the mouse.

If no design is selected, the tool will assume a power supply with a loop response defined in ¡°Equivalent Output Circuit¡±.

8.2.2 How to start Transient Analysis as a Standalone Tool Back to top
Click on [Loop & Stability] on the left main menu to start Loop Analysis.
Then, click [Transient Analysis] on the Loop Analysis page.


8.2.3 Introduction to Interface (Standalone Tool) Back to top
  1. Top Bar
  2. Loading Waveform
  3. Transient O/P Waveform


8.2.3.1 Top Bar Back to top
Please refer to Session 9.3.7--Top bar.


8.2.3.2 Loading Waveform Back to top
Users can modify the loading waveform.
The loading waveform is shown on the left while usesr can modify the waveform on the right. After any modification, click [Apply] to update.

Users can change the frequency of the loading waveform.

Two types of waveform are provided. Users can choose between step loading waveforms or sine loading waveforms.
Users can also modify the detail value for each type of waveform.

Click [Advanced User Setting].
Users can set the output impedance of a generic power supply by setting "Output Capacitor", "Output Inductor", "Loading Capacitor", "Max. positive supply current" and "Min. negative supply current" to customize the generic power supply characteristics.


8.2.3.3 Transient O/P Waveform Back to top
The transient O/P waveform is shown on the left while details on the waveform are shown on the right.


8.2.4 How to start Transient Analysis With Topology Back to top
Click on [Loop & Stability] on the left main menu to start Loop Analysis.
Then, click [Transient Analysis] on the Loop Analysis page.


8.2.5 Introduction to Interface (With Topology) Back to top
  1. Top Bar
  2. Select Output for Analysis
  3. Loading Waveform
  4. Transient O/P Waveform


8.2.5.1 Top Bar Back to top
Please refer to Session 9.5.1--Top bar.


8.2.5.2 Select Output for Analysis Back to top
Click the radio button to choose the output for analysis.


8.2.5.3 Loading Waveform Back to top
Users can modify the loading waveform.
The loading waveform is shown on the left while users can modify the waveform on the right. After any modification, click [Apply] to update.

Users can change the frequency of the loading waveform.

Two types of waveform are provided. Users can choose between step loading waveforms or sine loading waveforms.
Users can also modify the detail value for each type of waveform.


8.2.5.4 Transient O/P Waveform Back to top
The transient O/P waveform is shown on the left while the details on the waveform are shown on the right.