Semiconductor device, battery state monitoring module, and vehicle system
A vehicle system, includes 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 a engine to an electronic load circuit for controlling the engine and a starter, the battery state monitoring device carries out a short-circuit test operation for testing a short circuit state between two external terminals coupled to two ends of the current detecting resistance, and a current monitoring operation of measuring.
1. A battery system of a vehicle, comprising:
a battery coupled between a positive node and a negative node of power supply wirings of the vehicle;
a current detecting resistance coupled between the positive node and the negative node in series with the battery;
a vehicle control circuit configured to output an internal ignition signal to an engine starter and an engine controller;
a battery state monitoring circuit configured to detect a current monitor voltage corresponding to a current flow through the current detecting resistance coupled to the battery, the battery state monitoring circuit includes:
a state control circuit configured to detect a short-circuit of the two ends of the current detecting resistance based on the current monitor voltage and notice the detection of the short-circuit to the vehicle control system;
a first current source configured to output a first current to the battery and the current detection resistance from a first end of the current detecting resistance which is coupled to the battery; and
a second current source configured to output a second current to the battery and the current detection resistance from a second end of the current detecting resistance,
wherein the battery state monitoring circuit operates the detection of the short-circuit upon stop of the vehicle, and
wherein the vehicle control circuit is further configured to disable the activation of the internal ignition signal upon the detection of the short-circuit.
2. The battery system according to claim 1 ,
wherein the battery state monitoring circuit is further configured to control activation of the first current source and the second current source respectively,
wherein the state control circuit is further configured to:
detect a first voltage which corresponds to the current monitor voltage at a state that the first current source is activated and the second current source is inactivated;
detect a second voltage which corresponds to the current monitor voltage at a state that both of the first and the second current sources are activated;
detect the short-circuit of the two ends of the current detection resistance by comparing the first voltage and the second voltage.
3. The battery system according to claim 1 ,
wherein the battery state monitoring circuit is further configured to control current magnitudes of the first and the second currents respectively,
wherein the state control circuit is further configured to:
detect a first voltage which corresponds to the current monitor voltage at a state that the magnitudes of the first and the second currents are substantially different;
detect a second voltage which corresponds to the current monitor voltage at a state that the magnitudes of both of the first and the second currents are substantially the same;
detect the short-circuit of the two ends of the current detection resistance by comparing the first voltage and the second voltage.
4. The battery system according to claim 1 , wherein the first current source and the second current source supply the currents to the battery and the current detecting resistance from different nodes.
5. The battery system according to claim 4 , wherein the different nodes comprise the positive node and the negative node.