Nonlinear R-L-C NormDesigner43361 × Norm Member for 8 years 8 months 328 designs 2 groups https://explore.partquest.com/node/270072 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/270072"></iframe> Title Description <p>\</p><p>This version is under test to determine its accuracy and faithfulness to the actual switching characteristics.</p><p>[1] See Vorperian's "Simplified Analysis of PWM Converters Using Model of PWM Switch Part 1" in the May 1990 issue (Vol. 26, No. 3) of the IEEE Transactions on Aerospace and Electronic Systems.</p> About text formats Tags Buck ConverterSwitching ConverterStep-DownSpectral Source QuantitiesEMI Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
PWM Modulator v8 NormDesigner43361 × Norm Member for 8 years 8 months 328 designs 2 groups https://explore.partquest.com/node/268746 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/268746"></iframe> Title Description <p>\</p><p>This version is under test to determine its accuracy and faithfulness to the actual switching characteristics.</p><p>[1] See Vorperian's "Simplified Analysis of PWM Converters Using Model of PWM Switch Part 1" in the May 1990 issue (Vol. 26, No. 3) of the IEEE Transactions on Aerospace and Electronic Systems.</p> About text formats Tags Buck ConverterSwitching ConverterStep-DownSpectral Source QuantitiesEMI Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
Buck Converter PWM Modulator Line Transient Demo NormDesigner43361 × Norm Member for 8 years 8 months 328 designs 2 groups https://explore.partquest.com/node/268620 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/268620"></iframe> Title Description <p>Here's my attempt to model the PWM modulator in the frequency domain. It's a buck converterr switching at 200KHz. I use the advanced options to specify a linear frequency sweep, which includes harmonics of the switching frequency. There's a line frequency disturbance that modulates steady state response. Please note that my modulator model is only valid for voltage mode control.</p> <p>The line voltage is disturbed by bursts of pulses. The disturbance passes through to the output voltage. You can select different frequency ranges by adding and removing Spice comment indicators in the simulation controls.</p> <p>Compare results to Mike's TDFS analysis.</p> <p>This version is under test to determine its accuracy and faithfulness to the actual switching characteristics.</p> <p>[1] See Vorperian's "Simplified Analysis of PWM Converters Using Model of PWM Switch Part 1" in the May 1990 issue (Vol. 26, No. 3) of the IEEE Transactions on Aerospace and Electronic Systems.</p> About text formats Tags Buck ConverterSwitching ConverterStep-DownSpectral Source QuantitiesEMI Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
PWM Modulator SMSSA_modulator_v7p4 NormDesigner43361 × Norm Member for 8 years 8 months 328 designs 2 groups https://explore.partquest.com/node/268319 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/268319"></iframe> Title Description <p>\</p><p>This version is under test to determine its accuracy and faithfulness to the actual switching characteristics.</p><p>[1] See Vorperian's "Simplified Analysis of PWM Converters Using Model of PWM Switch Part 1" in the May 1990 issue (Vol. 26, No. 3) of the IEEE Transactions on Aerospace and Electronic Systems.</p> About text formats Tags Buck ConverterSwitching ConverterStep-DownSpectral Source QuantitiesEMI Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
Buck Converter, Structur of PWM Modulator - V7p2 NormDesigner43361 × Norm Member for 8 years 8 months 328 designs 2 groups https://explore.partquest.com/node/268097 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/268097"></iframe> Title Description <p>V5px, V6px and beyond are working prototypes of my nonlinear SMPS model that that lifts the restriction of averaging from frequency domain SMPS simulations. These initial prototypes are restricted to Voltage Control applications. My intent is to lift that restriction in a subsequent model enhancement.</p><p>The circuit modeling follows Vorperian's concept [1] of introducing equivalent circuits for the PWM modulator and the switch leaving the remainder of the converter as is. The PWM modulator and switch model nonlinearities by sourcing voltages at frequencies outside the external stimulae. With the restriction of averaging lifted the model becomes applicable at arbitrary frequencies across the spectrum up to and beyond the UHF band where EMI is studied, At frequencies below Fsw the model should produce the same results as the averaged switch.</p><p>This initial version of the modulator and switch is limited to voltage mode control and continuous conduction. It retains the assumption of small disturbances compared to steady state operation but the derivations make limited use of that assumption.</p><p>The test bench is the same buck converter Mike Donnelly used to demonstrate TDFS Loop Stability Analysis. I have replaced the switch assembly with an equivalent circuit derived by the methodology Vatche Vorperian documented in his May 1990 paper [1]. I drive the switch with a PWM modulator that sources the Fourier transform of the pulse sequence..</p><p>The key to coding the models is the use of VHDL-AMS spectral source quantities to formulate Fourier transforms involving products and ratios of waveforms. By this mechanism the models present all the characteristics of the non-linear components in the DC-DC converter. </p><p>swdrive continues to be derived as a closed form expression of the modulator output but now includes the combined steady state and transient drive signals. The switch model outputs a theoretically correct formulation of the switch outputs, the voltage at the common terminal and the current sourced out of the active terminal.</p><p>Potential applications:</p><p>1) Response at high frequencies to arbitrary disturbances including finite pulses, white noise, AM radio, X-Ray radiation...</p><p>2) Analyze susceptibility to electromagnetic interference (requires modeling of that interference).</p><p>3) Rad-Hard testing (requires modeling of that interference),</p><p>4) Generation of RF interference (e.g., by modeling the choke magnetics).</p><p>This version is under test to determine its accuracy and faithfulness to the actual switching characteristics.</p><p>[1] See Vorperian's "Simplified Analysis of PWM Converters Using Model of PWM Switch Part 1" in the May 1990 issue (Vol. 26, No. 3) of the IEEE Transactions on Aerospace and Electronic Systems.</p> About text formats Tags Buck ConverterSwitching ConverterStep-DownSpectral Source QuantitiesEMI Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
PWM Modulator - VCVS - corrected NormDesigner43361 × Norm Member for 8 years 8 months 328 designs 2 groups https://explore.partquest.com/node/267005 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/267005"></iframe> Title Description <p>PWM Modulator - VCVS</p><p>-------------------------------------------------------------------------------------</p><p>This is a structural representation of the language-based behavioral model found in SMSSA_modulator_v6p4. It is constructed from delay lines, summing and subtraction points, spectral quantity generatots (i.e. AS signal sources, passive R-C elements and Voltage-controlled voltage sources acting as high gain amplifiers and an integrator. It implements the same modulation expressions as v6p4 . All components are available from LTspice or any other Spice derivative.</p><p>All formulas have been developed rigorously except for the final dependence of the switch drive output on the control voltage. The assumptions of a periodic Vctl and the scaling applied to that voltage. These factors have been adjusted t o match results below 1/2 Fsw as simulated with the TDFS mechanism developed at Mentor by Mike Donnely.</p><p>Voltage-Controlled Voltage Sources act as ideal hi-gain opamps with infinite bandwidth, infinite Rin and zero Rout. Fixed AC sources account for the nonlinear behavior of the modulator. They are phase-shifted to 180 degrees to produce an in-phase result after three stages of summing points.</p> About text formats Tags Buck ConverterSwitching ConverterStep-DownSpectral Source QuantitiesEMI Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
PWM Modulator - VCVS NormDesigner43361 × Norm Member for 8 years 8 months 328 designs 2 groups https://explore.partquest.com/node/266935 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/266935"></iframe> Title Description <p>PWM Modulator - VCVS</p><p>-------------------------------------------------------------------------------------</p><p>This is a structural representation of the language-based behavioral model found in SMSSA_modulator_v6p4. It is constructed from delay lines, summing and subtraction points, spectral quantity generatots (i.e. AS signal sources, passive R-C elements and Voltage-controlled voltage sources acting as high gain amplifiers and an integrator. It implements the same modulation expressions as v6p4 . All components are available from LTspice or any other Spice derivative.</p><p>All formulas have been developed rigorously except for the final dependence of the switch drive output on the control voltage. The assumptions of a periodic Vctl and the scaling applied to that voltage. These factors have been adjusted t o match results below 1/2 Fsw as simulated with the TDFS mechanism developed at Mentor by Mike Donnely.</p><p>Voltage-Controlled Voltage Sources act as ideal hi-gain opamps with infinite bandwidth, infinite Rin and zero Rout. Fixed AC sources account for the nonlinear behavior of the modulator. They are phase-shifted to 180 degrees to produce an in-phase result after three stages of summing points.</p> About text formats Tags Switching ConverterEMIPulse Width ModulationStructural Model Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
Nonlinear SMPS AC Analysis - Buck Converter - V5p2.2 NormDesigner43361 × Norm Member for 8 years 8 months 328 designs 2 groups https://explore.partquest.com/node/266638 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/266638"></iframe> Title Description <p>V5px is the culmination of my goal to construct a nonlinear SMPS that can be analyzed in the frequency domain without averaging out the switching cycle variations. The circuit modeling follows Vorperian's concept [1] of introducing equivalent circuits for the PWM modulator and the switch leaving the remainder of the converter as is. The PWM modulator and switch model nonlinearities by sourcing voltages at frequencies outside the external stimulae. With the restriction of averaging lifted the model becomes applicable at arbitrary frequencies across the spectrum up to and beyond the UHF band where EMI is studied, At frequencies below Fsw the model should produce the same results as the averaged switch.</p> <p>This initial version of the modulator and switch is limited to voltage mode control and continuous conduction. It retains the assumption of small disturbances compared to steady state operation but the derivations make limited use of that assumption.</p> <p>The test bench is the same buck converter Mike Donnelly used to demonstrate TDFS Loop Stability Analysis. I have replaced the switch assembly with an equivalent circuit derived by the methodology Vatche Vorperian documented in his May 1990 paper [1]. I drive the switch with a PWM modulator that sources the Fourier transform of the pulse sequence..</p> <p>The key to coding the models is the use of VHDL-AMS spectral source quantities to formulate Fourier transforms involving products and ratios of waveforms. By this mechanism the models present all the characteristics of the non-linear components in the DC-DC converter.</p> <p>swdrive continues to be derived as a closed form expression of the modulator output but now includes the combined steady state and transient drive signals. The switch model outputs a theoretically correct formulation of the switch outputs, the voltage at the common terminal and the current sourced out of the active terminal.</p> <p>Potential applications:</p> <p>1) Response at high frequencies to arbitrary disturbances including finite pulses, white noise, AM radio, X-Ray radiation...</p> <p>2) Analyze susceptibility to electromagnetic interference (requires modeling of that interference).</p> <p>3) Rad-Hard testing (requires modeling of that interference),</p> <p>4) Generation of RF interference (e.g., by modeling the choke magnetics).</p> <p>This version is under test to determine its accuracy and faithfulness to the actual switching characteristics.</p> <p>[1] See Vorperian's "Simplified Analysis of PWM Converters Using Model of PWM Switch Part 1" in the May 1990 issue (Vol. 26, No. 3) of the IEEE Transactions on Aerospace and Electronic Systems.</p> About text formats Tags Buck ConverterSwitching ConverterStep-DownSpectral Source QuantitiesEMI Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
CAN Network Signaling Star WilliamTothDesigner179541 × WilliamToth Member for 6 years 10 months 28 designs 1 groups Add a bio to your profile to share information about yourself with other SystemVision users. https://explore.partquest.com/node/264949 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/264949"></iframe> Title Description <p>This 4-node CAN network model is an extensible platform for analyzing network signal quality. The network configuration can be easily modified to represent multiple design variants. This can include transmission line lengths and characteristics, termination impedance and placement, transceiver drive strength and edge-rates, etc. New nodes can easily be added. All of these configurations can be simulated and signal integrity verified. </p><p>In the particular configuration shown, the parasitic capacitance at Node 4 causes asymmetric transitions. This asymmetry would normally result in EMI-causing even-mode propagating currents on the transmission lines, but the choke greatly reduces this effect.</p> About text formats Tags CANSignal IntegrityEMITransceiverchoketransmission line Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
CAN Network Signaling WilliamTothDesigner179541 × WilliamToth Member for 6 years 10 months 28 designs 1 groups Add a bio to your profile to share information about yourself with other SystemVision users. https://explore.partquest.com/node/264865 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/264865"></iframe> Title Description <p>This 4-node CAN network model is an extensible platform for analyzing network signal quality. The network configuration can be easily modified to represent multiple design variants. This can include transmission line lengths and characteristics, termination impedance and placement, transceiver drive strength and edge-rates, etc. New nodes can easily be added. All of these configurations can be simulated and signal integrity verified. </p><p>In the particular configuration shown, the parasitic capacitance at Node 4 causes asymmetric transitions. This asymmetry would normally result in EMI-causing even-mode propagating currents on the transmission lines, but the choke greatly reduces this effect.</p> About text formats Tags CANSignal IntegrityEMITransceiverchoketransmission line Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -