(Automotive applications for stepper motors may include headlight leveling, adaptive headlamps (that is where the headlamps turn right or left with the steering wheel), EGR (exhaust gas recirculation) valves, and adjustable mirrors. Non-automotive apps for the method described in this series would be any stepper motor application where the current is around 1A.)

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1003461251_Datasheet PDF

发帖时间:2021-06-15 01:33:38

(Automotive applications for stepper motors may include headlight leveling, adaptive headlamps (that is where the headlamps turn right or left with the steering wheel), EGR (exhaust gas recirculation) valves, and adjustable mirrors. Non-automotive apps for the method described in this series would be any stepper motor application where the current is around 1A.)

In the following section, the transfer function from the input reference to the output voltage is calculated using the average method. Then, a pre-filter circuit is proposed based on the calculated transfer function to enhance the tracking performance of the converter. Finally, simulation and experimental result are provided to confirm the effectiveness of the proposed circuit.

 

1003461251_Datasheet PDF

Figure 1: Block diagram of a voltage-mode-controlled

synchronous buck converter with tracking input

Model

1003461251_Datasheet PDF

Using the average-modeling technique the control block diagram of the converter can be simplified as Figure 2 [Reference 2 ]. In this diagram, G(s) is the transfer function of the power stage filter and is given by:

1003461251_Datasheet PDF

where Co , ESL , ESR are equivalent apparent capacitance, series inductance, and resistance of the output capacitors, respectively. L is the output inductance and RL indicated the equivalent series resistance of the power stage and can be approximated by

Earlier we stated that under ideal conditions, and assuming an isotropic transmitting antenna, the power received at the output of the receiving antenna is given by

This relationship assumes that all of the power supplied to a transmitting antenna’s input terminals is radiated and all of the power incident on a receiving antenna’s effective aperture is captured and available at its output terminals. If we now utilize a directional transmitting antenna with gain Gt , then the power received in the direction of the transmitting antenna main lobe is given as

The term effective isotropic radiated power(EIRP) is often used instead of Pt Gt . EIRP is the power that would have to be supplied to an isotropic transmitting antenna to provide the same received power as that from a directive antenna. Note that a receiver cannot tell whether a transmitting antenna is directive or isotropic. The only distinction is that when a directive antenna is used, the transmitter radiates very little power in directions other than toward the receiver, whereas if an isotropic antenna is used, the transmitter radiates equally in all directions.

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