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US 9,543,819 B2Granted
Adaptive BJT driver for switching power converter
AssigneeDialog Semiconductor GmbH
InventorsPengju Kong, Hien Bui, Duc Doan, John Shi, Judy Sha
Life of this patent
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Abstract
A flyback converter is provided that includes a base driver for driving a base current into a base of a BJT power switch. The base driver is controlled so as to adaptively vary the base current across at least some of the pulses.
Claims20
A switching power converter, comprising:
- a bipolar junction transistor (BJT) power switch coupled to an inductor;
- a base current driver configured to drive a base current into a base of the BJT power switch;
- and
- a controller configured to control the base driver so that the BJT power switch cycles on and off according to the driving of the base current, wherein the base current for each current cycle in at least some of the BJT power switch cycles starts from a beginning value and is increased to a maximum value at a rate of change for the base current that is proportional to a rate of change for a collector current for the BJT power switch in a previous cycle to the current cycle.
1 more element
A method, comprising:
- cycling a bipolar junction transistor (BJT) power switch in a switching power converter to deliver power to a load;
- in a given one of the cycles, determining a rate of change for a collector current for the BJT power switch;
- and
- in a subsequent cycle to the given cycle, controlling a rate of change for a base current for the BJT power switch to be proportional to the determined rate of change for the collector current.
1 more element
A flyback converter, comprising:
- a bipolar junction transistor (BJT) power switch coupled to primary winding of a transformer;
- a base current driver configured to drive a base current into a base of the BJT power switch;
- and
- a controller configured to control the base driver so that the BJT power switch cycles on and off according to the driving of the base current, wherein the base current for each current cycle in at least some of the BJT power switch cycles starts from a beginning value and is increased to a maximum value at a rate of change for the base current that is proportional to a rate of change for a collector current for the BJT power in the current cycle.
1 more element
Dependencies are inferred from the claim text.