TDFS Loop Stability for curreent mode Buck DC to DC Converter - Switching 瀧澤登Designer123146 × 瀧澤登 Member for 7 years 323 designs 3 groups https://explore.partquest.com/node/267834 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/267834"></iframe> Title Description <p>This design demonstrates the use of the TDFS (Time Domain Frequency Sweep) simulation method, to measure the open-loop frequency response of an operating closed-loop system containing switching elements.</p><p>The stability of the "Buck DC to DC Converter - Switching" design is assessed. This is a switching circuit, it does not use a state-average model for the modulator, so the standard AC Analysis method cannot be used. Rather, the frequency response is generated from time-domain simulation results. The TDFS approach can also be used for systems that contain sampling or digital control aspects.</p><p>This particular example is directly comparable to the design titled "TDFS Loop Stability for Buck DC to DC Converter - State Average". In that design, both the TDFS and AC Analysis methods are used to measure the open loop transfer function of an equivalent non-switching circuit.</p><p>Note that the approach used to characterize the loop stability, by injecting a small sinusoidal stimulus signal in series with the loop and then measuring the complex ratio of the ground referenced return signal to the injected signal, is described in:</p><p>D. Venable, “Testing Power Sources for Stability”, Venable technical paper #1, Venable Industries</p> About text formats Tags Buck Convertercomponent stressOp-Amp Lead-Lag CompensatorSwitching ConverterTDFS Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
TDFS Loop Stability for Buck DC to DC Converter - Switching NormDesigner43361 × Norm Member for 8 years 328 designs 2 groups https://explore.partquest.com/node/264927 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/264927"></iframe> Title Description <p>This design demonstrates the use of the TDFS (Time Domain Frequency Sweep) simulation method, to measure the open-loop frequency response of an operating closed-loop system containing switching elements.</p><p>The stability of the "Buck DC to DC Converter - Switching" design is assessed. This is a switching circuit, it does not use a state-average model for the modulator, so the standard AC Analysis method cannot be used. Rather, the frequency response is generated from time-domain simulation results. The TDFS approach can also be used for systems that contain sampling or digital control aspects.</p><p>This particular example is directly comparable to the design titled "TDFS Loop Stability for Buck DC to DC Converter - State Average". In that design, both the TDFS and AC Analysis methods are used to measure the open loop transfer function of an equivalent non-switching circuit.</p><p>Note that the approach used to characterize the loop stability, by injecting a small sinusoidal stimulus signal in series with the loop and then measuring the complex ratio of the ground referenced return signal to the injected signal, is described in:</p><p>D. Venable, “Testing Power Sources for Stability”, Venable technical paper #1, Venable Industries</p> About text formats Tags Buck Convertercomponent stressOp-Amp Lead-Lag CompensatorSwitching ConverterNCV20071 Op-AmpNRVBA130LT3G Schottky Power RectifierMSS1583-105KE_ Power InductorPEG127KA3110Q Electrolytic CapacitorTDFS Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
test TDFS OreststDesigner172616 × Orestst Member for 6 years 4 months 33 designs 1 groups Add a bio to your profile to share information about yourself with other SystemVision users. https://explore.partquest.com/node/262974 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/262974"></iframe> Title Description About text formats Tags switched capacitorFrequency ResponseTDFS Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
Switched-Capacitor Filter Frequency Response using TDFS stefstepDesigner215105 × stefstep Member for 5 years 1 month 3 designs 1 groups Add a bio to your profile to share information about yourself with other SystemVision users. https://explore.partquest.com/node/261704 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/261704"></iframe> Title Description <p>This design shows the use of the TDFS (Time Domain Frequency Sweep) method to measure the frequency response of two low-pass filters. One is just a simple RC filter circuit with 1 kHz cut-off frequency. The other is an equivalent filter using a switched-capacitor implementation.</p><p>Both small-signal AC (frequency domain) and TDFS (time-domain) analyses are run, and both give the same results for the RC filter. However, because of the switching aspect of the switched-capacitor filter, the results of the AC analysis are meaningless for that circuit. However, the TDFS approach is valid for that filter also, as well as for any other circuit or system containing switching, sampled data or digital content.</p><p>For reference, note in the schematic that the R-C filter is connected to channel 1 of the TDFS instrument, and the switched capacitor filter is connected to channel 2, hence the v1 and v2 distinction in the name of the results for the magnitude (dbMag) and phase. Both are measured relative to the stimulus input vosc, the oscillator output.</p> About text formats Tags switched capacitorFrequency ResponseTDFS Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
Switched-Capacitor Filter Frequency Response using TDFS jarekDesigner212023 × jarek Member for 5 years 3 months 9 designs 1 groups Add a bio to your profile to share information about yourself with other SystemVision users. https://explore.partquest.com/node/259920 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/259920"></iframe> Title Description <p>This design shows the use of the TDFS (Time Domain Frequency Sweep) method to measure the frequency response of two low-pass filters. One is just a simple RC filter circuit with 1 kHz cut-off frequency. The other is an equivalent filter using a switched-capacitor implementation.</p><p>Both small-signal AC (frequency domain) and TDFS (time-domain) analyses are run, and both give the same results for the RC filter. However, because of the switching aspect of the switched-capacitor filter, the results of the AC analysis are meaningless for that circuit. However, the TDFS approach is valid for that filter also, as well as for any other circuit or system containing switching, sampled data or digital content.</p><p>For reference, note in the schematic that the R-C filter is connected to channel 1 of the TDFS instrument, and the switched capacitor filter is connected to channel 2, hence the v1 and v2 distinction in the name of the results for the magnitude (dbMag) and phase. Both are measured relative to the stimulus input vosc, the oscillator output.</p> About text formats Tags switched capacitorFrequency ResponseTDFS Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
Switched-Capacitor Filter Frequency Response using TDFS gmayankgautam180Designer209642 × gmayankgautam180 Member for 5 years 4 months 5 designs 1 groups Add a bio to your profile to share information about yourself with other SystemVision users. https://explore.partquest.com/node/255004 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/255004"></iframe> Title Description <p>This design shows the use of the TDFS (Time Domain Frequency Sweep) method to measure the frequency response of two low-pass filters. One is just a simple RC filter circuit with 1 kHz cut-off frequency. The other is an equivalent filter using a switched-capacitor implementation.</p><p>Both small-signal AC (frequency domain) and TDFS (time-domain) analyses are run, and both give the same results for the RC filter. However, because of the switching aspect of the switched-capacitor filter, the results of the AC analysis are meaningless for that circuit. However, the TDFS approach is valid for that filter also, as well as for any other circuit or system containing switching, sampled data or digital content.</p><p>For reference, note in the schematic that the R-C filter is connected to channel 1 of the TDFS instrument, and the switched capacitor filter is connected to channel 2, hence the v1 and v2 distinction in the name of the results for the magnitude (dbMag) and phase. Both are measured relative to the stimulus input vosc, the oscillator output.</p> About text formats Tags switched capacitorFrequency ResponseTDFS Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
Switched-Capacitor Filter Frequency Response using TDFS ANKITDesigner208679 × ANKIT Member for 5 years 4 months 20 designs 1 groups Add a bio to your profile to share information about yourself with other SystemVision users. https://explore.partquest.com/node/254841 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/254841"></iframe> Title Description <p>This design shows the use of the TDFS (Time Domain Frequency Sweep) method to measure the frequency response of two low-pass filters. One is just a simple RC filter circuit with 1 kHz cut-off frequency. The other is an equivalent filter using a switched-capacitor implementation.</p><p>Both small-signal AC (frequency domain) and TDFS (time-domain) analyses are run, and both give the same results for the RC filter. However, because of the switching aspect of the switched-capacitor filter, the results of the AC analysis are meaningless for that circuit. However, the TDFS approach is valid for that filter also, as well as for any other circuit or system containing switching, sampled data or digital content.</p><p>For reference, note in the schematic that the R-C filter is connected to channel 1 of the TDFS instrument, and the switched capacitor filter is connected to channel 2, hence the v1 and v2 distinction in the name of the results for the magnitude (dbMag) and phase. Both are measured relative to the stimulus input vosc, the oscillator output.</p> About text formats Tags switched capacitorFrequency ResponseTDFS Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
Stage test TDFS GalinaDesigner21 × Galina Member for 10 years 6 months 104 designs 3 groups Member of the PartQuest Explore team. https://explore.partquest.com/node/253021 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/253021"></iframe> Title Description About text formats Tags switched capacitorFrequency ResponseTDFS Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
COPY Switched-Capacitor Filter Frequency Response using TDFS GalinaDesigner21 × Galina Member for 10 years 6 months 104 designs 3 groups Member of the PartQuest Explore team. https://explore.partquest.com/node/246054 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/246054"></iframe> Title Description <p>This design shows the use of the TDFS (Time Domain Frequency Sweep) method to measure the frequency response of two low-pass filters. One is just a simple RC filter circuit with 1 kHz cut-off frequency. The other is an equivalent filter using a switched-capacitor implementation.</p><p>Both small-signal AC (frequency domain) and TDFS (time-domain) analyses are run, and both give the same results for the RC filter. However, because of the switching aspect of the switched-capacitor filter, the results of the AC analysis are meaningless for that circuit. However, the TDFS approach is valid for that filter also, as well as for any other circuit or system containing switching, sampled data or digital content.</p><p>For reference, note in the schematic that the R-C filter is connected to channel 1 of the TDFS instrument, and the switched capacitor filter is connected to channel 2, hence the v1 and v2 distinction in the name of the results for the magnitude (dbMag) and phase. Both are measured relative to the stimulus input vosc, the oscillator output.</p> About text formats Tags switched capacitorFrequency ResponseTDFS Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -
TDFS Open-Loop Frequency Response for PMSM/SVM Motion Control System peter.auerDesigner169266 × peter.auer Member for 6 years 5 months 8 designs 1 groups Add a bio to your profile to share information about yourself with other SystemVision users. https://explore.partquest.com/node/214696 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/214696"></iframe> Title Description <p>This example demonstrates using TDFS* to identify the open-loop transfer function of a closed-loop motion control system. Typical "AC" or frequency-domain analysis cannot be performed on this system for several reasons, including the sampled-data nature of the D-Q control algorithm, the switching of the space-vector modulated (SVM) drive inverter, and the non-linear stick-slip friction characteristic.</p><p>The open-loop gain (dBMag, blue) and phase (red) are shown in the on-schematic waveform viewer. Note that the unity gain crossover frequency is just below 5 Hz, and the phase margin is just under 34 degrees. This can be compared with the overshoot/ringing of the step response, observed in the time-domain simulation of the companion example: "Motion Control System with PMSM and SVM Drive - Step Response".</p><p>*To learn more about the Time Domain Frequency Response (TDFS) method, see our Blog Series: TDFS Part 1, 2 and 3.</p> About text formats Tags PMSMBLDCTDFSLoop StabilitySVMSpace-Vector ModulationD-Q Control Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -