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US 7,479,773 B2Granted
Synchronous rectification switching regulator and switching method
AssigneeRicoh Company, Ltd.
InventorYuusuke Michishita
Life of this patent
Estimating the term…
Abstract
A synchronous rectification switching regulator includes a reverse current prevention circuit unit that detects a symptom of a reverse current flowing in a direction from an output terminal to a second switching element or a generation of the reverse current based on a voltage of a connecting portion for connecting the second switching element with a third switching element. The reverse current prevention circuit unit turns off the third switching element to interrupt the reverse current when the reverse current prevention circuit unit detects the symptom or the generation of the reverse current.
Claims10
A synchronous rectification switching regulator, comprising:
- an input terminal configured to receive an input voltage;
- an output terminal configured to output a predetermined output voltage obtained by converting the input voltage;
- a load connected to the output terminal and configured to receive the predetermined output voltage output by the output terminal;
- a first switching element configured to perform a first switching;
- an inductor charged with the input voltage by the first switching of the first switching element;
- a second switching element for synchronous rectification configured to perform a second switching to discharge the inductor;
- a control circuit unit configured to control the first switching element to perform the first switching and to control the second switching element to perform the second switching opposite to the first switching, causing the output terminal to output the predetermined output voltage;
- a reverse current prevention circuit unit including a third switching element connected to the second switching element in series;
- and
- a connecting portion configured to connect the second switching element with the third switching element,
- wherein the reverse current prevention circuit unit detects one of a symptom of a reverse current flowing in a direction from the output terminal to the second switching element and a generation of the reverse current based on a voltage of the connecting portion, and
- wherein the reverse current prevention circuit unit turns off the third switching element to interrupt the reverse current when the reverse current prevention circuit unit detects the symptom or the generation of the reverse current.
9 more elements
A synchronous rectification switching regulator, comprising:
- an input terminal configured to receive an input voltage;
- an output terminal configured to output a predetermined output voltage obtained by converting the input voltage;
- a load connected to the output terminal and configured to receive the predetermined output voltage output by the output terminal;
- a first switching element configured to perform a first switching;
- an inductor charged with the input voltage;
- a second switching element for synchronous rectification configured to perform a second switching to discharge the inductor;
- a control circuit unit configured to control the first switching element to perform the first switching and to control the second switching element to perform the second switching opposite to the first switching, causing the output terminal to output the predetermined output voltage;
- a reverse current prevention circuit unit including a third switching element connected to the second switching element in series;
- and
- a connecting portion configured to connect the second switching element with the third switching element,
- wherein the reverse current prevention circuit unit detects one of a symptom of a reverse current flowing in a direction from the output terminal to the second switching element and a generation of the reverse current based on a voltage of the connecting portion, and
- wherein the reverse current prevention circuit unit turns off the third switching element to interrupt the reverse current when the reverse current prevention circuit unit detects the symptom or the generation of the reverse current.
9 more elements
A switching method, comprising:
- inputting an input voltage to an input terminal;
- connecting the input terminal with a load via an inductor and an output terminal;
- charging the inductor with the input voltage;
- connecting a second switching element with a third switching element in series via a connecting portion;
- detecting one of a symptom of a reverse current flowing in a direction from the output terminal to the second switching element and a generation of the reverse current based on a voltage of the connecting portion;
- turning off the third switching element to interrupt the reverse current when the symptom or the generation of the reverse current is detected;
- discharging the inductor by switching of the second switching element;
- and
- outputting a predetermined output voltage to the load.
6 more elements
Dependencies are inferred from the claim text.