Title:
SWITCHING REGULATOR
Document Type and Number:
Japanese Patent JP2755227
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To enhance the efficiency by connecting the primary winding, i.e., the current detection winding, with the primary winding of a transformer and driving a bipolar transistor trough a current transformer constituting the output of secondary winding, i.e., drive winding, thereby reducing the power loss caused by high on-resistance.
SOLUTION: Emitter-collector of a bipolar transistor 2 is connected in parallel with the cource-drain of an NOSFET 1 subjected to switching drive by the output signal from a pulse width control circuit 7. Primary winding, i.e., the current detection winding Nc, is connected with the primary winding NP of a transformer 3, thus constituting a current transformer 10 for driving the bipolar transistor 2 with the output from the secondary winding, i.e., a drive winding NB. According to the circuitry, the efficiency can be enhanced while ensuring the high speed switching characteristics of MOSFET 1 by reducing the power loss caused by high on-resistance.
Inventors:
MASAMOTO KAZUHIKO
Application Number:
JP25364595A
Publication Date:
May 20, 1998
Filing Date:
September 29, 1995
Export Citation:
Assignee:
NIPPON DENKI KK
International Classes:
H02M3/28; H02M3/335; (IPC1-7): H02M3/28; H02M3/335
Domestic Patent References:
| JP61240852A | ||||
| JP77935A | ||||
| JP5739144U |
Attorney, Agent or Firm:
Wakabayashi Tadashi
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