Switching power supply circuit having constant current circuit
AssigneeMurata Manufacturing Co., Ltd.
InventorsTatsuya Hosotani, Hiroshi Takemura
Life of this patent
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Abstract
A switching power supply circuit including a transformer having a primary winding, a secondary winding, and a feedback winding; a direct-current power supply of which one end is connected to one end of said primary winding; a switching element connected in series between the other end of said direct-current power supply and the other end of said primary winding; a control circuit provided between the control terminal of said switching element and said feedback winding; a rectifying circuit connected to said secondary winding; and a constant-current circuit provided between the one end of said primary winding and the control circuit or the control terminal of said switching element.
Claims5
A switching power supply circuit comprising:
- a transformer having a primary winding having first and second ends, a secondary winding, and a feedback winding;
- a direct-current power supply having first and second terminals, the first terminal being connected to the first end of said primary winding;
- a switching element connected in series between the second terminal of said direct-current power supply and the second end of said primary winding;
- a control circuit provided between a control terminal of said switching element and said feedback winding;
- a rectifying circuit connected to said secondary winding;
- and
- a constant-current circuit provided between the first end of said primary winding and a circuit point comprising an input of the control circuit or the control terminal of said switching element.
Dependencies are inferred from the claim text.