H - Electricity – 03 – B
Patent
H - Electricity
03
B
H03B 5/02 (2006.01) H02M 3/338 (2006.01)
Patent
CA 2124370
A self oscillating power converter utilizing a pair of MOSFET transistor switches in a half bridge configuration wherein the junction of the two transistors is coupled to a reactive network which in turn is connected to an output rectifier. The gate-to-drain inter-electrode capacitance of the switching transistors serves as the sole means of sustaining oscillations. Oscillations are started at the gate-to-source electrodes of the transistors by a startup circuit. The frequency of oscillation is determined by the gate-to-source capacitance of the transistors and the inductance of the drive transformer which couples the source-to-gate electrodes of the transistors to each other. The drive transformer is provided with a means of varying its inductance thereby changing the switching frequency so as to regulate the voltage.
Convertisseur de puissance auto-oscillant utilisant une paire de commutateurs à transistor MOS dans une configuration en demi-pont. La jonction des deux transistors est couplée à un réseau réactif qui, à son tour, est relié à un redresseur de sortie. La capacité inter-électrode grille-drain des transistors de commutation s'avère le seul moyen d'entretenir des oscillations. Ces oscillations commencent aux électrodes grille-source des transistors par un circuit de démarrage. La fréquence d'oscillation est déterminée par la capacité grille-source des transistors, ainsi que par l'inductance du transformateur de commande qui couple les électrodes source-grille des transistors les unes aux autres. Le transformateur de commande est pourvu d'un dispositif de variation d'inductance qui permet de modifier la fréquence de commutation afin de régler la tension.
Orange John R.s.
T.k. Power Incorporated
LandOfFree
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