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Inductor current

To substantially offset the eap iciti e ctirrcni by the power freciiiency inductor current... [Pg.675]

Designing the output filter choke La) in a forward-mode converter is done first. This simple procedure can be seen in Section 3.5.5. A key design factor is to design the inductor to operate in the continuous current mode. The typical value of peak inductor current is 150 percent of the rated output current. The typical valley (minimum) current is about 50 percent of the rated output current. [Pg.61]

The major concern of both output and input filter capacitors is the ripple current entering the capacitor. In this application, the ripple current is identical to the inductor ac current. The maximum limits of the inductor current is 2.8 A for I peak and about one-half the maximum output current or 1.0 A. So the ripple current is 1.8 A p-p or an estimated RMS value of 0.6 A (about one-third of the p-p value). [Pg.102]

The maximum value for the peak inductor current will occur at the crest voltage of the minimum expected ac input voltage. This is... [Pg.226]

In a Boost topology, there are no edges of inductor current waveform at the input. That is because there is an inductor present in series with the input, which helps level any current variations. So though a certain (small) amount of bulk capacitance is still required to smooth out the slowly undulating inductor current further, in principle, high-frequency... [Pg.75]

We are also seeing another pattern emerge here, that the inductor and its associated traces are not critical in any topology. That is because the inductor smooths out the current through it, so obviously no edges of current pass through it. The slowly undulating inductor current has ripple, but not noise We need not pay very close attention to it, except to keep it away from sensitive nodes, in particular the feedback trace. [Pg.144]

Note that while prototyping, it is a bad idea to insert a current probe (through a loop of wire), anywhere in a critical trace section. The current loop becomes an additional inductance that can increase the amplitude of the noise spikes dramatically. Therefore practically speaking, it can often become virtually impossible to measure the switch current or the diode current individually (especially in the case of switcher ICs). In such cases, only the inductor current waveform can really be measured properly. Sometimes we can place a small sense resistor instead of a current loop, because a good resistor will not create inductive kicks at least. [Pg.150]

Figure 6-17 Leave Options on the Board for Easy Connection to Current Probe for Measuring Inductor Current... Figure 6-17 Leave Options on the Board for Easy Connection to Current Probe for Measuring Inductor Current...
Recommendation 10 (Figure 6-17) Similar to Recommendation 9,1 leave a provision for inserting a current probe to monitor the inductor current. [Pg.162]

The average inductor current in a Buck delivering a load current of 70 is 70. [Pg.202]

But in a Boost or Buck-Boost, the average inductor current is equal to 70/(l - D). Further, the peak current in all cases is typically 20 to 30% higher... [Pg.202]

In other words, the transformer-based Flyback behaves just like an inductor-based Buck-Boost, with the difference that the output voltage is V0R, not V0. So decreasing V0R calls for a decrease in D. However, the same input power still has to be drawn from the switch. So if the width of its waveform decreases, the height of the waveform must increase. Which means that the inductor current must also increase. So, decreasing V0R could also end up decreasing efficiency. That is why for most universal-input Flybacks, the best Vqr compromise is about 90V to 105V. [Pg.230]

There is something puzzling about the statements above in case you haven t noticed How are we concluding that a decrease in D causes an increase in the inductor current So far we have been led to believe that in a Buck-Boost or Boost topology, the inductor current equals 70/(l - D), which implies that the inductor current goes up as D increases, not decreases ... [Pg.231]

Figure 10-12 Variations of Inductor Current Components for DC-DC Converters... Figure 10-12 Variations of Inductor Current Components for DC-DC Converters...
For the Buck, we see that the input capacitor RMS actually maxes out at D = 50%, whereas the output capacitor RMS current (curve number 12) increases dramatically at low D (high input). Does that really mean that we have to worry about the dissipation in the output capacitor Think about it. The output capacitor in a Buck is barely responsible for any of its losses, since it sees only the smoothened (undulating) inductor current. So yes, as a... [Pg.242]

Blog Entry 2 I m using the 2622 per Figure 3 of the datasheet. How do I calculate the average and peak inductor currents ... [Pg.275]

Average Diode Current Inductor Current Equals Load Current here... [Pg.279]

Blog Entry 2 What inductor are you using You could in fact be in current limit by using too low an inductor value, or saturating the inductor. I would measure your inductor current and make sure peaks are <5.75A. Maybe check the design on virtual bench too. After all you re trying to deliver >125W. [Pg.298]

EXERCISE 6-1 Find the inductor current IL as a function of time ... [Pg.348]

The SPICE equivalent circuit schematic is shown in Fig. 4.14. Note that the DCR (DC Resistance) of the inductor LI has been added (R DCR) to the circuit. Also added to the circuit is a voltage source between the inductor and the output in order to measure inductor current. The input voltage is pulsed from V to 20 V in order to help get the simulation started. [Pg.70]

The transient domain model shown in Fig. 4.33 was used to measure output ripple voltage, transient response, gate voltage, and inductor current. This model properly predicts the cycle-by-cycle switching effects of the regulator. [Pg.87]

The measured output inductor current and the PWM drive voltage are shown in Fig. 4.44, while the simulated response is shown in Fig. 4.45. [Pg.87]

A comparison between the step load response using the transient domain model and the state space average model is shown in Fig. 4.49, while a similar comparison of the output inductor current during the transient step load is shown in Fig. 4.50. [Pg.87]

Figure 4.44 Measured output inductor current and gate drive voltage. Figure 4.44 Measured output inductor current and gate drive voltage.
Figure 4.50 Average versus transient model step load response of inductor current. Figure 4.50 Average versus transient model step load response of inductor current.
Figure 4.53 SIMetrix results transient model, step load response, inductor current... Figure 4.53 SIMetrix results transient model, step load response, inductor current...

See other pages where Inductor current is mentioned: [Pg.665]    [Pg.138]    [Pg.143]    [Pg.199]    [Pg.203]    [Pg.232]    [Pg.233]    [Pg.234]    [Pg.242]    [Pg.254]    [Pg.275]    [Pg.275]    [Pg.277]    [Pg.281]    [Pg.283]    [Pg.284]    [Pg.295]    [Pg.296]    [Pg.298]    [Pg.299]    [Pg.306]    [Pg.78]    [Pg.82]   
See also in sourсe #XX -- [ Pg.65 , Pg.66 , Pg.67 , Pg.68 , Pg.71 , Pg.91 , Pg.186 , Pg.187 , Pg.190 , Pg.192 , Pg.214 , Pg.456 ]




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