Learn Know-how
ROHM Solution Simulator Toolbar Functions and Basic Operations
2021.12.08
Points of this article
・The user interface of the ROHM Solution Simulator employs icons that are widely known and familiar, and so can be used intuitively.
・The toolbar icons, such as for zooming in and out and for full-screen display, and other functions and methods of operation are widely familiar and easy to use.
The user interface and circuit diagram toolbar icons of the ROHM Solution Simulator are in general use and often seen, and so their use should be intuitively obvious. For a quick introduction to methods of operation, please refer to the “Hands-On User’s Manual(PDF)“.
Circuit Diagram Toolbar of the ROHM Solution Simulator
Fig. 1 shows the circuit diagram toolbar icons and functions. Icons in the blue rectangle will be described separately later. Upon hovering the cursor over an icon on the screen, a text bubble describing the function is displayed.
Fig.1. User interface and toolbar of the ROHM Solution Simulator

Below, the functions and methods of use of representative icons are explained.
Enlarge/Reduce Circuit Diagram Display
To enlarge or reduce the circuit diagram display, click on the Zoom In/Zoom Out icons on the toolbar. These operations can also be performed using a mouse wheel or two-finger swiping on a touchpad.
Fig.2. Enlarge/reduce circuit diagram display: Zoom In/Zoom Out icons

Display Entire Circuit Diagram
Upon clicking the Zoom to Fit icon, the circuit diagram, which may have been enlarged/reduced or moved (explained later), is automatically adjusted so as to be displayed in the entire circuit diagram display area, providing a view of the entire circuit diagram.
Fig. 3. Display entire circuit diagram: Zoom to Fit icon

Enter/Exit Fullscreen Mode
When using the entire screen for display, the Enter Fullscreen Mode icon is clicked. When in Fullscreen Mode, the Enter Fullscreen Mode icon changes to an Exit Fullscreen Mode icon. To end Fullscreen Mode, either click the Exit Fullscreen Mode icon, or move the cursor to the uppermost part of the screen, and click the ? icon when it is displayed.
Fig. 4. Enter/Exit Fullscreen Mode: Enter Fullscreen Mode/ Exit Fullscreen Mode icons

Label Visibility Settings
Upon clicking the Design Settings icon, settings related to label visibility of components in the circuit diagram and the like can be made. There are three visibility settings.
Show All Labels:All labels are visible
Show Chosen Labels:Only the selected labels are visible
Hide All Labels:No labels are visible
Labels are visible when the circuit diagram is displayed at a certain size or greater. If labels cannot be seen even when Show All Labels is selected, try Zooming In (enlarging) the circuit diagram.
Fig. 5. Label display settings: Design Settings icon

Move Circuit Diagram
Upon clicking on any arbitrary area of the circuit diagram, a drag-and-drop operation can be used to move the display position of the circuit diagram. This is similar to the drag-and-drop operations to move objects used in many programs.
Fig. 6. Move circuit diagram: Drag & Drop

Learn Know-how
Electrical Circuit Design
- Soldering Techniques and Solder Types
- Seven Tools for Soldering
- Seven Techniques for Printed Circuit Board Reworking
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Basic Alternating Current (AC)
- AC Circuits: Alternating Current, Waveforms, and Formulas
- Complex Numbers in AC Circuit
- Electrical Reactance
- What is Impedance? AC Circuit Analysis and Design
- Impedance Measurement: How to Choose Methods and Improve Accuracy
- Impedance Matching: Why It Matters for Power Transfer and Signal Reflections
- Resonant Circuits: Resonant Frequency and Q Factor
- RLC Circuit: Series and Parallel, Applied circuits
- What is AC Power? Active Power, Reactive Power, Apparent Power
- Power Factor: Calculation and Efficiency Improvement
- What is PFC?
- Boundary Current Mode (BCM) PFC: Examples of Efficiency Improvement Using Diodes
- Continuous Current Mode (CCM) PFC: Examples of Efficiency Improvement Using Diode
- LED Illumination Circuits:Example of Efficiency Improvement and Noise Reduction Using MOSFETs
- PFC Circuits for Air Conditioners:Example of Efficiency Improvement Using MOSFETs and Diodes
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Basic Direct Current (DC)
- Ohm’s Law: Voltage, Current, and Resistance
- Electric Current and Voltage in DC Circuits
- Kirchhoff’s Circuit Laws
- What Is Mesh Analysis (Mesh Current Method)?
- What Is Nodal Analysis (Nodal Voltage Analysis)?
- Thevenin’s Theorem: DC Circuit Analysis
- Norton’s Theorem: Equivalent Circuit Analysis
- What Is the Superposition Theorem?
- What Is the Δ–Y Transformation (Y–Δ Transformation)?
- Voltage Divider Circuit
- Current Divider and the Current Divider Rule
Thermal design
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About Thermal Design
- Changes in Engineering Trends and Thermal Design
- A Mutual Understanding of Thermal Design
- Fundamentals of Thermal Resistance and Heat Dissipation: About Thermal Resistance
- Fundamentals of Thermal Resistance and Heat Dissipation: Heat Transmission and Heat Dissipation Paths
- Fundamentals of Thermal Resistance and Heat Dissipation : Thermal Resistance in Conduction
- Fundamentals of Thermal Resistance and Heat Dissipation : Thermal Resistance in Convection
- Fundamentals of Thermal Resistance and Heat Dissipation : Thermal Resistance in Emission
- Thermal Resistance Data: JEDEC Standards, Thermal Resistance Measurement Environments, and Circuit Boards
- Thermal Resistance Data: Actual Data Example
- Thermal Resistance Data: Definitions of Thermal Resistance, Thermal Characterization Parameters
- Thermal Resistance Data: θJA and ΨJT in Estimation of TJ: Part 1
- Thermal Resistance Data: θJA and ΨJT in Estimation of TJ: Part 2
- Surface Temperature Measurements: Methods for Fastening Thermocouples
- Surface Temperature Measurements: Thermocouple Mounting Position
- Surface Temperature Measurements: Treatment of Thermocouple Tips
- Surface Temperature Measurements: Influence of the Thermocouple
- Estimating TJ: Basic Calculation Equations
- Estimating TJ: Calculation Example Using θJA
- Estimating TJ: Calculation Example Using ΨJT
- Estimating TJ: Calculation Example Using Transient Thermal Resistance
- Estimation of Heat Dissipation Area in Surface Mounting and Points to be Noted
- Surface Temperature Measurements: Thermocouple Types
- Summary
- Collection of Important Points Relating to Thermal Design
Switching Noise
- Procedures in Noise Countermeasures
- What is EMC?
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Dealing with Noise Using Capacitors
- Understanding the Frequency Characteristics of Capacitors, Relative to ESR and ESL
- Measures to Address Noise Using Capacitors
- Effective Use of Decoupling (Bypass) Capacitors Point 1
- Effective Use of Decoupling Capacitors Point 2
- Effective Use of Decoupling Capacitors, Other Matters to be Noted
- Effective Use of Decoupling Capacitors, Summary
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Dealing with Noise Using Inductors
- Frequency-Impedance Characteristics of Inductors and Determination of Inductor’s Resonance Frequency
- Basic Characteristics of Ferrite Beads and Inductors and Noise Countermeasures Using Them
- Dealing with Noise Using Common Mode Filters
- Points to be Noted: Crosstalk and Noise from GND Lines
- Summary of Dealing with Noise Using Inductors
- Other Noise Countermeasures
- Basics of EMC – Summary
Simulation
- Thermal Simulation of PTC Heaters
- Thermal Simulation of Linear Regulators
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Foundations of Electronic Circuit Simulation Introduction
- About SPICE
- SPICE Simulators and SPICE Models
- Types of SPICE simulation: DC Analysis, AC Analysis, Transient Analysis
- Types of SPICE simulation: Monte Carlo
- Convergence Properties and Stability of SPICE Simulations
- Types of SPICE Model
- SPICE Device Models: Diode Example–Part 1
- SPICE Device Models: Diode Example–Part 2
- SPICE Subcircuit Models: MOSFET Example―Part 1
- SPICE Subcircuit Models: MOSFET Example―Part 2
- SPICE Subcircuit Models: Models Using Mathematical Expressions
- About Thermal Models
- About Thermal Dynamic Model
- Summary
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About the ROHM Solution Simulator
- How to Access the ROHM Solution Simulator
- Trying Out the ROHM Solution Simulator (1)
- Trying Out the ROHM Solution Simulator (2)
- Starting a Simulation Circuit in the ROHM Solution Simulator
- ROHM Solution Simulator Toolbar Functions and Basic Operations
- ROHM Solution Simulator: User Interface
- Execution of Simulations
- Method for Displaying Simulation Results
- Simulation Result Display Tool: Wavebox
- Simulation Results Display Tool: Waveform Viewer
- Customization of Simulations
- Exporting Circuit Data to PartQuest™ Explorer
- Purchasing Samples for Evaluation
- Optimization of PFC Circuits
- Optimization of Inverter Circuits
- About Thermal Simulations of DC-DC Converters
- Circuit-Theory-Based Design Simulation