Power unit having self-oscillating series resonance converter

H - Electricity – 02 – M

Patent

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Details

H02M 3/338 (2006.01)

Patent

CA 2524513

The present invention relates to a power unit with a self-oscillating series resonance converter for feeding of a load. The series resonance converter comprises: two transistors TR1, TR2 coupled together, which are arranged to individually be affected by a control transformer T1, a series connection of an inductor L1 and a capacitor C4, and means to change the oscillating frequency of the transistors TR1, TR2 and thereby the output voltage of the power unit. Each transistor TR1, TR2 together with the series coupled discharging capacitor C6, C7 or additional transistor TR3, TR4 belonging thereto is connected in parallel with said inductor L1, capacitor C4 and control transformer Tl. The means to change the oscillating frequency of the transistors comprises a control oscillator OSC that in an alternating manner sends pulses that turns off the transistor TR1, TR2 that conducts current and thereby the oscillating frequency of the transistors is controlled by the pulse frequency of the control oscillator OSC.

La présente invention a trait à un bloc d'alimentation comportant un convertisseur de résonance en série à oscillation autonome pour l'alimentation d'une charge. Le convertisseur de résonance en série comporte deux transistors TR1, TR2 couplés ensemble, qui sont disposés pour être soumis de manière individuelle à l'influence d'un transformateur de commande T1, d'une connexion en série d'une bobine d'inductance L1 et d'un condensateur C4, et des moyens pour la modification de la fréquence d'oscillation des transistors TR1, TR2 et par conséquent la tension de sortie du bloc d'alimentation. Chaque transistor TR1, TR2 conjointement avec le condensateur de décharge C6, C7 couplés en série ou des transistors supplémentaires TR3, TR4 associés à ceux-ci est relié à ladite bobine d'inductance L1, au condensateur C4 et au transformateur de commande T1. Le moyen de modification de la fréquence d'oscillation des transistors comprend un oscillateur de commande OSC qui de manière alternée envoie des impulsions qui mettent le transistor TR1, TR2 qui conduit le courant hors circuit et par conséquent la fréquence d'oscillation des transistors est contrôlée par la fréquence d'impulsion de l'oscillateur de commande OSC.

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