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Automatic Measurement of Power Supply Load Current Using Programmable Overcurrent Detector

IP.com Disclosure Number: IPCOM000040652D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Smith, CD: AUTHOR

Abstract

Many new power supply designs include a method of remotely programming overcurrent protection. This is typically done by the inclusion of a digital-to-analog converter in the power supply and controlling the converter from an external processor. Increasing the range of the programmable overcurrent detector so that it extends downward into the normal operating current of the circuitry allows the measurement of current demand for electronic circuitry. A method of measuring the current automatically is described in the following. As seen in Fig. 1, the range of the programmable overcurrent detector is increased such that it extends downward into the normal operating current of the circuitry. When the proposed method is implemented (Fig.

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Automatic Measurement of Power Supply Load Current Using Programmable Overcurrent Detector

Many new power supply designs include a method of remotely programming overcurrent protection. This is typically done by the inclusion of a digital-to- analog converter in the power supply and controlling the converter from an external processor. Increasing the range of the programmable overcurrent detector so that it extends downward into the normal operating current of the circuitry allows the measurement of current demand for electronic circuitry. A method of measuring the current automatically is described in the following. As seen in Fig. 1, the range of the programmable overcurrent detector is increased such that it extends downward into the normal operating current of the circuitry. When the proposed method is implemented (Fig. 2), the overcurrent point can be programmed downward under control of the external processor until an overcurrent indication (trip signal) is issued from the power supply. This indication can then be used as a direct measurement of the circuit load current. Because of the speed and processor control inherent in this method, the data can be entered into a data base to create a statistical profile of the product's load currents and provide information about circuit technology current demands and operating margins in circuit design. This can be done automatically during the manufacturing process.

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