AC ripple meter
First Claim
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1. A monitor for measuring an ac ripple component of an output voltage of a bridge rectifier as a percentage of the output voltage, the monitor comprising, in combination:
- first rectifier means for converting the ripple component into a first dc voltage equal to a magnitude of the ac ripple appearing at an output of the bridge rectifier;
second rectifier means for converting the ac component and a dc component of the bridge rectifier output voltage into a second dc voltage equal to a magnitude of the rectifier output;
ratio determining means connected to receive the first and second dc voltages and for providing an output alarm indication when a ratio of the first dc voltage to the second dc voltage exceeds a selected threshold magnitude; and
display means for displaying the alarm indication.
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Abstract
An apparatus and method are disclosed for measuring and displaying the percentage of ac voltage ripple present on a direct current input voltage. In addition, the apparatus can be set to activate alarms and trip relays when the percentage of ac voltage ripple meets or exceeds a preset value.
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Citations
12 Claims
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1. A monitor for measuring an ac ripple component of an output voltage of a bridge rectifier as a percentage of the output voltage, the monitor comprising, in combination:
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first rectifier means for converting the ripple component into a first dc voltage equal to a magnitude of the ac ripple appearing at an output of the bridge rectifier; second rectifier means for converting the ac component and a dc component of the bridge rectifier output voltage into a second dc voltage equal to a magnitude of the rectifier output; ratio determining means connected to receive the first and second dc voltages and for providing an output alarm indication when a ratio of the first dc voltage to the second dc voltage exceeds a selected threshold magnitude; and display means for displaying the alarm indication. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A monitor for measuring an ac ripple component of an output voltage of a bridge rectifier as a percentage of a magnitude of the output voltage, the monitor comprising, in combination:
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first rectifier means for converting the ripple component into a first dc voltage proportional to a magnitude of the ac ripple appearing at an output of the bridge rectifier; second rectifier means for converting the ac component and a dc component of the rectifier output voltage into a second dc voltage having a magnitude proportional to a magnitude of the rectifier output voltage, said second rectifier means including switchable means for dividing the second voltage into a third dc voltage which is a predetermined percentage of the magnitude of the rectifier output voltage; comparator means connected for receiving the first and third dc voltages and for providing an output alarm indication when the magnitude of the first dc voltage exceeds the magnitude of the third dc voltage; and display means for displaying the alarm indication. - View Dependent Claims (8)
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9. A method for determining a percentage magnitude of ac ripple present on an input voltage comprising the steps of:
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separating an ac component of the input voltage from the input voltage; converting the ac component into a first dc voltage having a magnitude equivalent to the magnitude of the ac component; rectifying the input voltage to produce a second dc voltage proportional to an rms value of the input voltage; comparing the magnitude of the first dc voltage with a magnitude of the second dc voltage to determine whether the first voltage exceeds one of a series of threshold percentages of the second dc voltage; and displaying the threshold percentages exceeded. - View Dependent Claims (10, 11, 12)
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Specification