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The simulation tool uses a SIMetrix/SIMPLIS simulation environment.Most engineers will agree that simulation is about increasing the chance that your design will work when it’s in production. It has become the standard for power supply system simulation and new product definition analysis.Software Developers Manual Volume 2 (2A, 2B, 2C & 2D): Instruction Set Reference. SIMPLIS is the leading simulation engine for switched mode power supply design and has been rapidly adopted by leading power supply, computing and telecommunication equipment manufacturers in recent years. Is the technology leader in simulation software for the power electronics industry. SIMPLIS Technologies, Inc. By establishing the desired outcome from simulation, we can objectively compare the differences between the two engines in question, SIMPLIS and SPICE.About SIMPLIS Technologies.
Back in the day, we would design boards, test them in the lab, debug, redesign, and repeat the whole cycle again and again and again, until we got it right. The most common release is 6.10, with over 98 of all installations.Face it, redesigning and re-spinning PCBs is expensive. Sortly is an auto parts inventory software that allows you to add multiple photos of each itemalong with any item detailsfor a more intuitive (and less maddening) way to keep track of your auto parts inventory across multiple locations.SIMetrix/SIMPLIS Intro is a software program developed by SIMetrix Technologies Ltd. Stop searching for your inventory and start seeing it. And, ultimately, you want to save some money in the process.Our Auto Parts Inventory Software Lets You See Your Inventory.
Power supplies and converters are notoriously difficult to simulate, and the simulation solutions optimized for ICs are not necessarily the best tools for power conversion simulation.Testing the health of your power converter designGiven that simulation saves rework, time, and, ultimately, money, what simulations do you need to run? To establish the health and robustness of a power converter design, either by simulation or lab measurement, there is a set of “vital sign” tests analogous to medical vital signs used to quickly establish a human’s overall health. Maxim, for instance, measures simulation success by the number of its ICs that go to production with “first silicon.” The power management industry, however, has been late to the simulation party. There would also be the unfortunate times when not all the problems were caught, and thousands (or millions) of products were built before customers found problems that needed to be corrected.Decades ago, the semiconductor industry recognized that it could only be successful by completely simulating IC designs before fabricating the first wafers.
AC analysis, also known as small signal, Bode, or frequency-response analysis, requires specialized equipment such as the AP Instruments AP300, Omicron Bode 100, or Agilent 4194A or 4195A, which are not commonly found in the lab. For a more complete picture of the “health” of the control loop, there’s the AC loop analysis method.AC loop analysis looks at the control loop in the frequency domain, enabling direct measurement of the control-loop bandwidth and phase margin (going back to our medical example, this step is like taking a patient’s blood pressure). The trained eye can qualitatively judge the effectiveness of the control loop by inspecting the load-step transient response graph. If the feedback circuit is not properly designed, the converter can overshoot or undershoot too far, ring excessively, recover too slowly, or break into oscillation. Load-step simulation measures how much the output voltage changes and how quickly it recovers. Just like a person’s pulse will change with exercise, the output voltage of a power converter will change when it is exercised by a change in the load current.
With a converter in equilibrium, every switching cycle looks just like every other switching cycle, kind of like a patient’s respiratory rate. Since this analysis may not be available in the lab, being able to simulate it is especially valuable.Steady-state analysis is arguably an oxymoron for switched-mode power conversion equilibrium analysis would be a better description. The signal is swept over a frequency range and the gain and phase response are plotted on a log scale.
There are some applications specifically sensitive to line-transient performance (audio, for example), but most of the time this test is less important compared to load step.Start-up looks specifically at what happens when input voltage is first applied (or an enable pin is asserted). The input voltage is quickly stepped between two values while observing the output voltage. Using a separate steady-state analysis is actually just a convenience.Line transient is another way to disturb the control loop and observe its recovery. Steady-state operation can actually be observed during load-step tests by zooming in for a closer inspection of the waveforms between the load steps.
Therefore, the tests that directly establish the control system stability and responsiveness are the most important: load step and AC loop analysis.Key differences between SIMPLIS and SPICENow, back to SIMPLIS versus SPICE. Note that if the converter is oscillating, component stresses will be higher, power losses will be higher, and efficiency will be lower.Before any of these tests have meaning, the converter must be stable and not oscillating. If losses are high, efficiency will be low and the design produces excessive heat. Typically, before turning on the power converter for the first time, control-system health should be verified by simulating load step, AC loop, and then start up before heading to the lab.Efficiency analysis establishes converter power losses which lead to an estimate of component temperature rise (just like taking a patient’s temperature).
It comes down to two real differences between SIMPLIS and SPICE. SPICE circuit simulation is considered the industry-standard method to verify circuit operation at the transistor level.The best way to compare SIMPLIS to SPICE is to see how each handles the most critical “vital sign” power conversion tests. Developed in the 1970s at UC Berkeley, SPICE (Simulation Program with Integrated Circuit Emphasis) is a general-purpose, open-source analog electronic circuit simulation engine. Today, SIMPLIS is a popular engine for power conversion system simulation as well as new product definition analysis. SIMPLIS Technologies now develops and owns the engine.
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SIMPLIS can perform 10x to 50x faster than SPICE with the same level of accuracy by modeling devices via a series of straight-line segments, instead of solving non-linear equations as SPICE does. Fortunately, better solutions are available today.Why SIMPLIS is better than SPICE for power circuitsAlthough SPICE was not developed specifically for power supply circuits, many companies continue to use it for this purpose, even with its drawbacks for switched-mode ICs. This reckless approach may have been more appropriate decades ago, before SIMPLIS or small-signal models were available. However, this approach takes a lot of time and expense.Finally, one SPICE tactic commonly used is to avoid the Bode plot simulation and rely solely on the load-step response to gauge robustness of the control loop. The problem has been adequately analyzed by researchers from Cal Tech and Virginia Tech, who succeeded in making small-signal models practical however, the two different SPICE models still need to be correlated.It is also common for companies to avoid the SPICE/Bode plot problem altogether by creating a second calculation engine, in code or Excel, specifically to solve the Bode plot problem without using SPICE. This power-conversion small-signal modeling problem was recognized decades ago.
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