Control circuit and ideal diode circuit
AssigneeShindengen Electric Manufacturing Co., Ltd.
InventorKazuhiko Saito
Life of this patent
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Abstract
A control circuit includes: a transistor controller that controls a voltage at a gate terminal of a field effect transistor in accordance with a difference in voltage between a source terminal and a drain terminal of the field effect transistor connected so that a body diode is in a forward direction; and a current controller that reduces an operating current for operating the transistor controller when a load connected via the source terminal of the field effect transistor is light, and increases the operating current when the load is heavy.
Claims7
A control circuit comprising:
- a transistor controller that controls a voltage at a gate terminal of a field effect transistor in accordance with a difference in voltage between a source terminal and a drain terminal of the field effect transistor connected so that a body diode is in a forward direction;
- and
- a current controller that
- reduces an operating current for operating the transistor controller when a load connected via the source terminal of the field effect transistor is light, and
- increases the operating current when the load is heavy,
- wherein the current controller comprises:
- a detection circuit that
- detects the voltage at the gate terminal of the field effect transistor, and
- determines whether the load is light or heavy, based on the voltage at the gate terminal of the field effect transistor.
An ideal diode circuit comprising:
- a control circuit;
- and
- a field effect transistor, wherein
- the control circuit comprises:
- a transistor controller that controls a voltage at a gate terminal of the field effect transistor in accordance with a difference in voltage between a source terminal and a drain terminal of the field effect transistor connected so that a body diode is in a forward direction;
- and
- a current controller that
- reduces an operating current for operating the transistor controller when a load connected via the source terminal of the field effect transistor is light, and
- increases the operating current when the load is heavy,
- wherein the current controller comprises:
- a detection circuit that
- detects the voltage at the gate terminal of the field effect transistor, and
- determines whether the load is light or heavy, based on the voltage at the gate terminal of the field effect transistor.
Dependencies are inferred from the claim text.