Self-excited DC-DC converter and a power supply de

专利名称：Self-excited DC-DC converter and a power

supply device using same

发明人：Tamura, Hideki,Yamashita, Mikihiro,Katsura,

Yoshinori

申请号：EP99111442.2申请日：19990611公开号：EP0964505B1公开日：20050216

摘要：A self-excited DC-DC converter and a power supply device using the same whichcan produce a constant output voltage for a wide range of input voltage without usinghigh voltage components. The self-excited DC-DC converter includes a first transistor forswitching an input DC voltage to produce an output voltage whose voltage value is downconverted from the input DC voltage, a primary winding one end of which is connected toa collector of the first transistor, a diode whose cathode is connected to a connectionpoint of the first transistor and the primary winding and whose anode is connected to theground, a capacitor connected between the other end of the primary winding and theground, a feedback winding magnetically coupled to the primary winding and connectedbetween a base and an emitter of the first transistor, and a second transistor providedbetween the base and emitter of the first transistor for bypassing a base current of thefirst transistor in such a way that the amount of bypassing the base current is regulatedin response to a value of the output voltage.

申请人：MATSUSHITA ELECTRIC WORKS LTD

地址：JP

国籍：JP

代理机构：Tetzner, Volkmar, Dr.-Ing. Dr. jur.

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