Voltage monitor self testing
First Claim
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1. A voltage monitor system comprising:
- a voltage rail;
a voltage monitor operatively connected to the voltage rail to monitor voltage of the voltage rail with at least one input connection;
a self-test module operatively connected to the voltage rail to perturb voltage at the at least one input connection of the voltage monitor for testing the voltage monitor; and
a logic component operatively connected to a voltage input of the self-test module and operatively connected to at least one output of the voltage monitor, wherein the logic component is configured to change voltage of the voltage input of the self-test module and monitor voltage of the at least one output of the voltage monitor to determine test response of the voltage monitor to the change in voltage of the voltage input of the self-test module, wherein the self-test module includes a capacitor connected in series between the voltage rail and the voltage input of the self-test module to perturb voltage at the at least one input connection of the voltage monitor in response to a change in voltage of the voltage input of the self-test module.
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Abstract
A voltage monitor system includes a voltage rail. A voltage monitor is operatively connected to the voltage rail to monitor voltage of the voltage rail with at least one input connection. A self-test module is operatively connected to the voltage rail to perturb voltage at the at least one input connection of the voltage monitor for testing the voltage monitor.
6 Citations
16 Claims
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1. A voltage monitor system comprising:
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a voltage rail; a voltage monitor operatively connected to the voltage rail to monitor voltage of the voltage rail with at least one input connection; a self-test module operatively connected to the voltage rail to perturb voltage at the at least one input connection of the voltage monitor for testing the voltage monitor; and a logic component operatively connected to a voltage input of the self-test module and operatively connected to at least one output of the voltage monitor, wherein the logic component is configured to change voltage of the voltage input of the self-test module and monitor voltage of the at least one output of the voltage monitor to determine test response of the voltage monitor to the change in voltage of the voltage input of the self-test module, wherein the self-test module includes a capacitor connected in series between the voltage rail and the voltage input of the self-test module to perturb voltage at the at least one input connection of the voltage monitor in response to a change in voltage of the voltage input of the self-test module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of testing a voltage monitor comprising:
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supplying a secondary voltage at a node in a voltage divider of a voltage rail; changing the secondary voltage; analyzing output from a voltage monitor connected to the voltage rail to determine whether the output from the voltage monitor is within a predetermined range; and signaling a fault if the output form the voltage monitor is not within the predetermined range, wherein changing the secondary voltage includes at least one of; spiking the secondary voltage downward to test the output of the voltage monitor for proper monitoring of undervoltage;
orspiking the secondary voltage upward to test the output of the voltage monitor for proper monitoring of overvoltage. - View Dependent Claims (16)
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Specification