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US 2024/0204776 A1Published application
Drive circuit
AssigneeMitsumi Electric Co., Ltd.
InventorKenji MITSUHIRA
Life of this patent
Estimating the term…
Abstract
The present disclosure provides a drive circuit whereby dead times and boost periods can be generated accurately. A drive circuit includes: a drive terminal; a first source current source to generate a first source current; a second source current source to generate a second source current; a first sink current source to generate a first sink current; a second sink current source to generate a second sink current; a logic circuit to generate a source drive command and a sink drive command in accordance with a clock; and a control circuit to generate a source boost signal and a sink boost signal in accordance with the clock.
Claims9
A drive circuit comprising:
- a drive terminal;
- a first source current source configured to generate a first source current that flows through the drive terminal;
- a second source current source configured to generate a second source current that is added to the first source current;
- a first sink current source configured to generate a first sink current that flows through the drive terminal;
- a second sink current source configured to generate a second sink current that is added to the first sink current;
- a logic circuit configured to generate a source drive command for operating the first source current source and a sink drive command for operating the first sink current source, in accordance with a clock, such that the first source current and the first sink current flow alternately, with dead times in between, each dead time being a period in which flows of the first source current and the first sink current are stopped;
- and
- a control circuit configured to generate a source boost signal and a sink boost signal in accordance with the clock,
- the source boost signal operating the second source current source such that the second source current starts flowing through the drive terminal immediately after a first one of the dead times ends, and then stops flowing, and
- the sink boost signal operating the second sink current source such that the second sink current starts flowing through the drive terminal immediately after a second one of the dead times ends, and then stops flowing.
7 more elements
A drive circuit comprising:
- a drive terminal;
- a first source current source configured to generate a first source current that flows through the drive terminal;
- a second source current source configured to generate a second source current that is added to the first source current;
- a first sink current source configured to generate a first sink current that flows through the drive terminal;
- a second sink current source configured to generate a second sink current that is added to the first sink current;
- and
- a control circuit configured such that:
- when a source drive command becomes an ON command, the first source current and the second source current start flowing through the drive terminal, and then a flow of the second source current is stopped;
- when the source drive command becomes an OFF command, a flow of the first source current is stopped;
- when a sink drive command becomes the ON command, the first sink current and the second sink current start flowing through the drive terminal, and then a flow of the second sink current is stopped;
- and
- when the sink drive command becomes the OFF command, a flow of the first sink current is stopped,
- wherein the control circuit generates a first dead time, a second dead time, a first boost period, and a second boost period, in accordance with a common clock,
- the first dead time being a period from when the sink drive command becomes the OFF command, until the source drive command becomes the ON command,
- the second dead time being a period from when the source drive command becomes the OFF command, until the sink drive command becomes the ON command,
- the first boost period being a period in which the second source current is added to the first source current, and
- the second boost period being a period in which the second sink current is added to the first sink current.
14 more elements
Dependencies are inferred from the claim text.