On-voltage measurement method

JP2025132711APending Publication Date: 2025-09-10MINEBEA POWER SEMICON DEVICE INC
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Patent Information

Application Number
JP2024030459
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-02-29
Publication Date
2025-09-10

AI Technical Summary

Technical Problem

Existing methods for measuring the on-voltage of a switching element in an inverter circuit face challenges due to high voltage application when the switching element is turned off, making it difficult to use high-precision measuring instruments.

Method used

The method involves floating the power supply and signal source of the inverter circuit, connecting the output terminal of the upper arm switching element to a ground potential measurement terminal, and using a switch to control the electrical connection between the power supply terminal and the measurement terminal, ensuring the switch is on during the on-state of the switching element and off during its off-state.

Benefits of technology

This approach allows for accurate measurement of the on-voltage of the switching element using high-precision measuring instruments while preventing high voltage application to the measuring instrument.

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Abstract

To provide an on-voltage measurement method capable of measuring an on-voltage of a switching element with high accuracy.SOLUTION: An on-voltage measurement method includes: a connection step of electrically connecting an U terminal 4b of a switching element Q1 of an upper arm of an inverter IC to a measurement terminal 6b of a ground potential of a measuring device 6 by bringing each power supply of an inverter IC 4 and a signal source 3 into a floating state; a control step of outputting a switch control signal synchronized with a drive signal of the switching element Q1 from the signal source 3 to a switch 5 that switches electrical connection or disconnection between a VDC terminal 4a of the inverter IC 4 and the measurement terminal 6a on a positive side of the measurement device 6; and a measurement step of measuring an on-voltage of the switching element Q1 by the measurement device 6. In the control step, the switch 5 is turned on in at least a part of the period in which the switching element Q1 is in the on state, and the switch 5 is also turned off in the period in which the switching element Q1 is in the off state.SELECTED DRAWING: Figure 1
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Citation Information

Patent Citations

  • On voltage measurement circuit and on voltage measurement method

    JP2023108333A