Boost converter with start-up circuit

Details Boost converter with start-up circuit Boost converter with start-up circuit

H - Electricity

02

M

H02M 3/158 (2006.01) H02M 1/36 (2007.01)

Patent

CA 2753030

The present invention is concerned with an electronic circuit (C) that comprises a first electronic sub-circuit (uC) having an operating voltage that is higher than a supply voltage ( Vbat) provided by a voltage source (V), and a second electronic sub-circuit (B) that is coupled to the voltage source (V) and to a first voltage input (VIl ) of the first electronic sub-circuit (uc), wherein said second electronic sub-circuit (B) comprises a short-time voltage boosting circuit (Ll, D1, C1, TA1 ) that is adapted to provide a voltage at the first voltage input (VIl ) for a period long enough to enable a start-up of the first electronic sub-circuit (uC) when the short- time voltage boosting circuit (L1, D1, C1, TA1 ) is triggered and a controllable voltage boosting circuit (L1, D1, T1, C1 ) that is adapted to provide a boosted voltage at the first voltage input (VIl ), which controllable voltage boosting circuit (L1, D1, T1, C1 ) is coupled to a control output (CO) of the first electronic sub-circuit (uC) to receive a control signal, and wherein said period is long enough to also allow starting the control of the controllable voltage boosting circuit (L1, D1, T1, C1) by the first electronic sub-circuit (uC).

La présente invention concerne un circuit électronique (C) qui comprend un premier sous-circuit électronique (uC) dont la tension de service est supérieure à une tension d'alimentation (Vbat) fournie par une source de tension (V) et un second sous-circuit électronique (B) qui est couplé à la source de tension (V) et à une première entrée de tension (VI1) du premier sous-circuit électronique (uc). Ledit second sous-circuit électronique (B) comprend un circuit d'amplification de tension de courte durée (L1, D1, C1, TA1 ) conçu pour fournir une tension à la première entrée de tension (VI1) pendant une période suffisamment longue pour permettre le démarrage du premier sous-circuit électronique (uC) lorsque le circuit d'amplification de tension de courte durée (L1, D1, C1, TA1 ) est déclenché et un circuit d'amplification de tension pilotable (L1, D1, T1, C1 ) conçu pour fournir une tension amplifiée à la première entrée de tension (VI1). Ledit circuit d'amplification de tension pilotable (L1, D1, T1, C1 ) est couplé à une sortie de commande (CO) du premier sous-circuit électronique (uC) pour recevoir un signal de commande, et ladite période est suffisamment longue pour permettre au premier sous-circuit électronique (uC) de démarrer la commande du circuit d'amplification de tension pilotable (L1, D1, T1, C1 ).

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