Driver circuit
AssigneeSiemens Aktiengesellschaft
InventorStephan Bolz
Life of this patent
Estimating the term…
Abstract
Driver circuit (1) for actuating an electrical device via a control line (3) and for diagnosing the state of the control line (3) and/or of the actuated device, having a test circuit (Q1-Q6, R1-R6), connected to the control line (3), for measuring the electrical output current flowing via the control line (3), and an evaluation unit (5-8), connected to the test circuit, for generating a diagnostic signal (DIAG) on the basis of the measured output current, the test circuit having at least one current mirror circuit (Q1, Q2; Q4-Q5).
Claims20
A driver circuit for actuating an ignition output stage in an internal combustion engine via a control line and for diagnosing the state of the control line and of the ignition output stage, having a test circuit, connected to the control line, for measuring the electrical output current flowing via the control line, and an evaluation unit, connected to the test circuit, for generating a diagnostic signal on the basis of the measured output current, wherein the test circuit has two current mirror circuits, the first current mirror circuit being connected to the voltage side of the control line while the second current mirror circuit is connected to the ground side of the control line, and in that the evaluation unit has two comparator units which respectively compare the output current or a signal derived from the output current with a prescribed threshold value and generate the diagnostic signal on the basis of the comparison.
A driver circuit for actuating an ignition output stage in an internal combustion engine via a control line and for diagnosing the state of the ignition output stage, having a test circuit, connected to the control line, for measuring the electrical output current flowing via the control line, and an evaluation unit, connected to the test circuit, for generating a diagnostic signal on the basis of the measured output current, wherein the test circuit has two current mirror circuits, the first current mirror circuit being connected to the voltage side of the control line while the second current mirror circuit is connected to the ground side of the control line, and in that the evaluation unit has two comparator units which respectively compare the output current or a signal derived from the output current with a prescribed threshold value and generate the diagnostic signal on the basis of the comparison.
Dependencies are inferred from the claim text.