Boost type DC-DC converter synchronous power tube current-limiting circuit

Boost type DC-DC converter synchronous power tube current-limiting circuit

The utility model aims at the risk of damaging a main switching tube Q2, a synchronous power tube Q1 and output end equipment by surge current in the existing Boost circuit during start up, and provides a Boost type DC-DC converter synchronous power tube current-limiting circuit. The boost type DC-D...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: WU KAIKAI, WEN CHANGBAO, LI YANMING, YANG XIAOBING, ZHANG HAO, QIU YANZHANG
Format: Patent
Sprache:eng
Schlagworte:
APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS
CONTROL OR REGULATION THEREOF
CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
GENERATION
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Beschreibung
Zusammenfassung:The utility model aims at the risk of damaging a main switching tube Q2, a synchronous power tube Q1 and output end equipment by surge current in the existing Boost circuit during start up, and provides a Boost type DC-DC converter synchronous power tube current-limiting circuit. The boost type DC-DC converter synchronous power tube current-limiting circuit comprises a current and voltage detection unit, a current limiting unit and a synchronous power tube Q1, wherein the current and voltage detection unit is used for detecting voltage difference between output voltage VOUT and input voltage VIN of the synchronous power tube Q1, and transmitting a detection result undervoltage control signal VUVLO to the current limiting unit and a logic control circuit. The boost type DC-DC converter synchronous power tube current-limiting circuit can realize the function of limiting current of the synchronous power tube Q1, has the advantages of simple whole circuit structure, high precision and fast response, and can improve the reliability of the system.