Dc/dc conversion circuit

Details Dc/dc conversion circuit Dc/dc conversion circuit

H - Electricity

02

M

H02M 3/337 (2006.01) H02J 3/18 (2006.01) H02M 3/335 (2006.01) H02M 7/217 (2006.01)

Patent

CA 2120286

of the type that implements the "forward PWM" topology and which comprises a DC/AC converter (M), a self-driven synchronous rectifier (T1,T2), which rectifies the alternating voltage signal coming from the DC/AC converter (M), and a filter (L1, C1) that filters the rectified signal, thereby obtaining the DC output voltage from the DC/DC conversion circuit. This DC/DC conversion circuit is characterised in that the DC/AC converter (M) includes means to generate an alternating signal with a square waveform that does not take zero instantaneous values such that no current flows through the body diode of either of the transistors (T1,T2) of the self-driven synchronous rectifier.

L'invention est un redresseur synchrone autonome (T1, T2) du type à topologie à modulation directe d'impulsions en durée comportant un convertisseur continu-alternatif (M), qui est utilisé pour redresser la tension alternative du convertisseur continu-alternatif (M) et filtrer le signal redressé au moyen d'un filtre (L1, C1), pour produire une tension de sortie continue. Ce circuit de conversion continu-continu est caractérisé par le fait que le convertisseur continu-alternatif (M) comporte un dispositif produisant une tension alternative au moyen d'une onde carrée qui ne prend pas des valeurs nulles instantanées et qui n'annule pas le courant dans la diode de l'un ou l'autre transistor (T1, T2) du redresseur synchrone autonome.

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