Current detection circuit
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorHiroshi Yoshino
Life of this patent
Estimating the term…
Abstract
A current detection circuit has a differential amplification circuit that outputs a differential output current dependent on a voltage difference between input terminals and first and second feedback circuits that output a detection current in response to the differential output current and form a feedback path to each input terminal of the differential amplification circuit. First and second MOS transistors that generate voltages dependent on respective source-drain voltages at a time when drain currents in a forward direction and a backward direction flow through an output MOS transistor are connected to respective input terminals of the differential amplification circuit.
Claims20
A current detection circuit, comprising:
- a differential amplification circuit that includes first and second input terminals and outputs first and second differential output currents dependent on a voltage difference between the first and second input terminals;
- a first feedback circuit that outputs a first detection current in response to the first differential output current and forms a path to the second input terminal;
- a second feedback circuit that outputs a second detection current in response to the second differential output current and forms a path to the first input terminal;
- a first MOS transistor that generates, in a state where a drain current in a forward direction flows through an output MOS transistor that supplies an output current to a load, a voltage dependent on a source-drain voltage of the output MOS transistor, between a source of the output MOS transistor and the second input terminal;
- and
- a second MOS transistor that generates, in a state where a drain current in a backward direction flows through the output MOS transistor, a voltage dependent on a source-drain voltage of the output MOS transistor, between a drain of the output MOS transistor and the first input terminal.
A current detection circuit, comprising:
- a first MOS transistor that supplies an output current to a load;
- a second MOS transistor that supplies an output current to the load;
- a differential amplification circuit that has first and second input terminals and outputs a differential output current dependent on a voltage difference between the first and second input terminals;
- a third MOS transistor with a source that is connected to sources of the first and second MOS transistors and a drain that is connected to the second input terminal;
- a fourth MOS transistor that connects a drain of the first MOS transistor to the first input terminal when the first MOS transistor is turned on;
- a fifth MOS transistor that connects a drain of the second MOS transistor to the first input terminal when the second MOS transistor is turned on;
- a first feedback circuit that outputs a first detection current in response to a differential output current at a time when the first MOS transistor is turned on and forms a path to the second input terminal;
- and
- a second feedback circuit that outputs a second detection current in response to the differential output current at a time when the second MOS transistor is turned on and forms a path to the first input terminal.
A current detection circuit, comprising:
- a first MOS transistor with a drain that is connected to a first terminal of an exciting coil of a motor;
- a second MOS transistor with a drain that is connected to a second terminal of the exciting coil;
- a differential amplification circuit that has first and second input terminals and outputs a differential output current dependent on a voltage difference between the first and second input terminals;
- a third MOS transistor with a source that is connected to sources of the first and second MOS transistors and a drain that is connected to the second input terminal;
- a fourth MOS transistor that connects a drain of the first MOS transistor to the first input terminal when the first MOS transistor is turned on;
- a fifth MOS transistor that connects a drain of the second MOS transistor to the first input terminal when the second MOS transistor is turned on;
- a first feedback circuit that outputs a first detection current in response to the differential output current at a time when the first MOS transistor is turned on and forms a path to the second input terminal;
- and
- a second feedback circuit that outputs a second detection current in response to the differential output current at a time when the second MOS transistor is turned on and forms a path to the first input terminal.
Dependencies are inferred from the claim text.