Semiconductor device, battery state monitoring module, and vehicle system
First Claim
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1. A semiconductor device, comprising:
- first and second external terminals coupled to power supply wiring that couples one end of a current detecting resistance and a power supply terminal of a battery;
a third external terminal coupled to an other end of the current detecting resistance;
a measurement part for measuring a voltage difference between the first external terminal and the second external terminal;
a first resistance coupled between the second external terminal and the one end of the current detecting resistance;
a first current source for outputting a first measurement current to the second external terminal;
a second current source for outputting a second measurement current to the third external terminal; and
a control circuit for controlling an output of the second measurement current destined to the third external terminal,wherein the first and second external terminals are coupled on a same side to the first resistance via an uninterrupted current path, andwherein the control circuit intercepts outputs of the first and the second measurement currents by the first and the second current sources in a current monitoring operation of measuring a current monitor voltage value that varies according to a current flowing through the current detecting resistance, and measures a voltage difference between the second external terminal and the third external terminal in the current monitoring operation.
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Abstract
A semiconductor device has a first and a second external terminals coupled to power supply wiring that couples one end of a current detecting resistance and a power supply terminal of a battery, a third external terminal coupled to an other end of the current detecting resistance, and a control circuit for controlling an output of a second measurement current destined to the third external terminal, and measures a voltage difference between the first external terminal and the second external terminal.
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Citations
17 Claims
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1. A semiconductor device, comprising:
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first and second external terminals coupled to power supply wiring that couples one end of a current detecting resistance and a power supply terminal of a battery; a third external terminal coupled to an other end of the current detecting resistance; a measurement part for measuring a voltage difference between the first external terminal and the second external terminal; a first resistance coupled between the second external terminal and the one end of the current detecting resistance; a first current source for outputting a first measurement current to the second external terminal; a second current source for outputting a second measurement current to the third external terminal; and a control circuit for controlling an output of the second measurement current destined to the third external terminal, wherein the first and second external terminals are coupled on a same side to the first resistance via an uninterrupted current path, and wherein the control circuit intercepts outputs of the first and the second measurement currents by the first and the second current sources in a current monitoring operation of measuring a current monitor voltage value that varies according to a current flowing through the current detecting resistance, and measures a voltage difference between the second external terminal and the third external terminal in the current monitoring operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A battery state monitoring module, comprising:
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a battery state monitoring device including a current monitor voltage measurement circuit for measuring a current monitor voltage value that varies according to a current value flowing through a current detecting resistance coupled to a power supply terminal of a battery; and an arithmetic circuit that determines a state of the battery based on the current monitor voltage value measured by the battery state monitoring device, and transmits the determination result at a request from a high-order system, wherein the current monitor voltage measurement circuit includes; first and second external terminals coupled to power supply wiring that couples one end of the current detecting resistance and the power supply terminal of the battery; a third external terminal coupled to an other end of the current detecting resistance; a measurement part for measuring a voltage difference between the first external terminal and the second external terminal; a first resistance coupled between the second external terminal and the one end of the current detecting resistance; a first current source for outputting a first measurement current to the second external terminal; a second current source for outputting a second measurement current to the third external terminal; and a control circuit for controlling an output of the second measurement current destined to the third external terminal, wherein the first and second external terminals are coupled on a same side to the first resistance via an uninterrupted current path, wherein the control circuit stops outputs of the first and the second measurement currents by the first and the second current sources, respectively, in a current monitoring operation of measuring the current monitor voltage value, and wherein the measurement part measures a voltage difference between the second external terminal and the third external terminal in the current monitoring operation. - View Dependent Claims (11, 12, 13, 14)
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15. A vehicle system, comprising:
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a battery state monitoring module including a battery state monitoring device for measuring a current monitor voltage value that varies according to a current value flowing through a current detecting resistance coupled to power supply terminals of a battery, and an arithmetic circuit that determines a state of the battery based on the current monitor voltage value measured by the battery state monitoring device and transmits the determination result at a request from a high-order system; and a central control unit for outputting an internal ignition signal that directs start and stop of an engine to an electronic load circuit for controlling the engine and a starter, wherein the battery state monitoring device carries out a short-circuit test operation for testing a short circuit state between two different external terminals coupled to two different ends of the current detecting resistance, and a current monitoring operation of measuring a current monitor voltage value that occurs between the two ends of the current detecting resistance, and wherein the central processing unit makes the engine move to a stop state by the internal ignition signal in response to a vehicle becoming in a stop state, also directs a diagnosis processing of the battery including the short-circuit test operation and the current monitoring operation to the battery state monitoring device, and when making the vehicle move from the stop state to a run state, makes the starter and the engine start by the internal ignition signal and also receives a result of the diagnosis processing of the battery, wherein the battery state monitoring device includes; first and second external terminals coupled to power supply wiring that couples one end of the current detecting resistance and the power supply terminal of the battery; a third external terminal coupled to an other end of the current detecting resistance; a measurement part for measuring a voltage difference between the first external terminal and the second external terminal; a first resistance coupled between the second external terminal and a first end of the two different ends of the current detecting resistance; a first current source for outputting a first measurement current to the second external terminal; a second current source for outputting a second measurement current to the third external terminal; and a control circuit for controlling an output of the second measurement current destined to the third external terminal, wherein the first and second external terminals are coupled on a same side to the first resistance via an uninterrupted current path, wherein the control circuit stops outputs of the first and the second measurement currents by the first and the second current sources, respectively, in a current monitoring operation of measuring the current monitor voltage value, and wherein the measurement part measures a voltage difference between the second external terminal and the third external terminal in the current monitoring operation. - View Dependent Claims (16, 17)
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Specification