Cours Hacheur convertisseur DC DC Partie 3
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=suVXVDmIpNM
Le hacheur ou convertisseur continu - continu est un dispositif de l'électronique de puissance mettant en œuvre un ou plusieurs interrupteurs commandés et qui permet de modifier la valeur de la tension d'une source de tension continue avec un rendement élevé. Le découpage se fait à une fréquence très élevée ce qui a pour conséquence de créer une tension moyenne. C'est l'analogue, pour les sources de tensions continues, du transformateur utilisé en régime alternatif. • Si la tension délivrée en sortie est inférieure à la tension appliquée en entrée, le hacheur est dit dévolteur. Dans le cas contraire, il est dit survolteur. Il existe des hacheurs capables de travailler des deux manières (Boost-Buck). • In electronics, a chopper circuit is any of numerous types of electronic switching devices and circuits used in power control and signal applications. A chopper is a device that converts fixed DC input to a variable DC output voltage directly. Essentially, a chopper is an electronic switch that is used to interrupt one signal under the control of another. • In power electronics applications, since the switching element is either fully on or fully off, its losses are low and the circuit can provide high efficiency. However, the current supplied to the load is discontinuous and may require smoothing or a high switching frequency to avoid undesirable effects. In signal processing circuits, use of a chopper stabilizes a system against drift of electronic components; the original signal can be recovered after amplification or other processing by a synchronous demodulator that essentially un-does the chopping 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