Boost converter for a White-LED driver

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Components can be grouped and documented using the NOTE block. Documentation notes are resizable and can have any background color. This application shows a white LED driver. The parameters for the white LED, like forward voltage drop across the diode and the on-resistance of the diode are specified directly per white LED. The junction capacitance of the white LED is modeled by a parallel capacitor. The mosfet model is enhanced with the external lead inductance and for the Schottky diode, the junction capacitance is modeled by a parallel capacitor of 140pF. To simulate the losses in the output capacitor, Resr models the series resistance of the capacitor.

For the boost converter the series resistance and the capacitance between the windings is modeled.

In this application the voltage at the output is regulated to three times the forward voltage drop over the white LED's. The next step would be a current controller driving the gate of the mosfet to control a constant current through the white LED's

Three-level inverter with inductive load

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This animation shows the current flow during the operation of a three-level inverter. Each mode of operation can be observed. If the replay function is enabled, even the transition from one operation point into the next can be studied during the manual replay. Using the replay you are able to see which current paths, no matter how short in time, do occur.




Animation of a Switched Reluctance Machine

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The library contains various models for electrical machines, such as the Switched Reluctance Machine (SRM). In this application a SRM with 6 stator poles and 4 rotor poles is driven from a simple inverter. The model of the SRM contains 3 control signals that are high whenever rotor pole starts to align with a stator pole. Scope 3 shows the rotor position dependent stator-inductance.

The rotor of the SRM is connected to a shaft with inertia and bearing. During the simulation the position and alignment of the SRM rotor is animated.

During a replay the alignment of the SRM rotor and the rotor position dependent stator-inductance can be studied, by simply moving the replay track-bar.



Animation of a zero-voltage resonant Switched Mode Power Supply


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The animation shows the resonant commutation that takes place in a zero-voltage resonant converter. Since the resonant commutation is a complex process to understand, the replay gives insight into the resonant behavior.

The current path and direction of the current can be studied in detail with the replay function.


Animation of the electrical and mechanical drive train in a HYBRID automotive application

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This animation shows the drive train of a hybrid car. Only the two back wheels are driven by the differential. The input of the differential is connected to the clutch. The other side of the clutch is connected to the output of the power split. The power split is essentially a planetary gear with two inputs. These inputs are the diesel engine and the electrical machine, while the output of the power split is connected to the clutch. A gearbox is not modeled in this example. On the shaft of the power split that is connected to the diesel engine, also a generator mounted. The three phase terminals of the generator are rectified and connected to a DC bus by the switch S1. Using a controller the battery can be loaded from the DC bus. The power on the DC bus can also be used to drive the electrical machine via the voltage source inverter with Pulse Width Modulation (PWM)



Permanent Magnet Synchronous Machine with PI speed controller.

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A simple speed control of a Permanent Magnet Synchronous Machine (PMSM) with 6-pulse and PI control shows the ease with which a simulation model of an electrical drive can be build.

The reference speed value is set with the interactive UPDOWN block. During the simulation the user can click the left or right button on this block to increase or decrease its output value. Compared with the measured speed from the shaft, it is input to the speed PI controller. The output from the PI control sets the DC link voltage of the inverter. The output of the inverter is connected to the PMSM. The voltages on the PMSM are shown in scope3. The shaft of the PMSM is connected to a rotating mass and an angular speed sensor. From the measured angular speed, the rotor position is estimated and us used to control the gates of the Mosfets in the inverter. The simulation shows how the speed of the shaft is controlled untl it reaches its set value of 50 [Rad/s].

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