Rectifier circuit, power supply device, and rectifier circuit drive method
AssigneeSharp Kabushiki Kaisha
InventorTAKESHI SHIOMI
Life of this patent
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Abstract
A transient current in a rectifier circuit is effectively reduced. In a rectifier circuit, a first rectifier is provided between a first terminal and a second terminal. In the rectifier circuit, when a switch element is turned ON, a primary winding current flows from a power supply to a primary winding of a transformer. When the switch element is turned OFF, a second rectifier current flows from a secondary winding of the transformer to a second rectifier. During a period in which the second rectifier current is flowing, a reverse voltage is applied between the first terminal and the second terminal.
Claims18
A rectifier circuit, comprising:
- a first terminal;
- and a second terminal,
- with reference to the first terminal, a positive voltage to be applied to the second terminal being a forward voltage,
- with reference to the second terminal, a positive voltage to be applied to the first terminal being a reverse voltage,
- if the forward voltage is applied, a forward rectifier circuit current flowing from the second terminal to the first terminal, and
- if the reverse voltage is applied, the forward rectifier circuit current being blocked,
- the rectifier circuit, further comprising:
- a first rectifier connected to the first terminal and the second terminal;
- a transformer including a primary winding and a secondary winding;
- a second rectifier connected in parallel to the first rectifier through the secondary winding;
- a switch element connected to the primary winding;
- and
- a power supply connected to the primary winding,
- when the switch element is turned ON, a primary winding current flowing from the power supply to the primary winding,
- when the switch element is turned OFF, a second rectifier current flowing from the secondary winding to the second rectifier, and
- during a period in which the second rectifier current is flowing, the reverse voltage being applied.
A rectifier circuit drive method for driving a rectifier circuit,
- the rectifier circuit including:
- a first terminal;
- and a second terminal,
- in the rectifier circuit,
- with reference to the first terminal, a positive voltage to be applied to the second terminal being a forward voltage,
- with reference to the second terminal, a positive voltage to be applied to the first terminal being a reverse voltage,
- if the forward voltage is applied, a forward rectifier circuit current flowing from the second terminal to the first terminal, and
- if the reverse voltage is applied, the forward rectifier circuit current being blocked,
- the rectifier circuit further including:
- a first rectifier connected to the first terminal and the second terminal;
- a transformer including a primary winding and a secondary winding;
- a second rectifier connected in parallel to the first rectifier through the secondary winding;
- a switch element connected to the primary winding;
- and
- a power supply connected to the primary winding,
- the rectifier circuit drive method, comprising:
- applying the forward voltage, so that the forward rectifier circuit current flows;
- turning the switch element ON after the applying the forward voltage, so that a primary winding current flows from the power supply to the primary winding;
- turning the switch element OFF after the turning the switch element ON, so that a second rectifier current flows from the secondary winding to the second rectifier, and
- applying the reverse voltage, after the turning the switch element OFF, during a period in which the second rectifier current is flowing.
Dependencies are inferred from the claim text.