Double-pulse test systems and methods

• US 10,640,003 B2
• Filed: 06/08/2017
• Issued: 05/05/2020
• Est. Priority Date: 06/08/2017
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Lu, Xi, Chen, Chingchi, Xu, Zhuxian, Bhat, Krishna Prasad, Yu, Lan, Degner, Michael W.
• Primary Examiner(s): Patel, Paresh
• Application Number:
  US15/617,640
• Publication Number:
  US 20180354384A1
• Time in Patent Office: 1,062 Days
• Field of Search: None
• CPC Class Codes: B60K 6/28 characterised by the electric energy storing means, e.g. batteries or capacitors
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60Y 2200/91 Electric vehicles
• CPC Class Codes: B60Y 2200/92 Hybrid vehicles
• CPC Class Codes: B60Y 2400/112 Batteries
• CPC Class Codes: G01R 31/006 on road vehicles, e.g. automobiles or trucks testing of ignition installations peculiar to internal combustion engines F02P17/00
• CPC Class Codes: G01R 31/261 for measuring break-down voltage or punch through voltage therefor
• CPC Class Codes: G01R 31/2621 for testing field effect transistors, i.e. FET's
• CPC Class Codes: G01R 31/3277 of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
• CPC Class Codes: G01R 31/392 Determining battery ageing or deterioration, e.g. state of health
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: H01M 2010/4271 Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y10S 903/907 Electricity storage, e.g. battery, capacitor

Abstract

The methods and systems for correcting for an inductive load when testing high voltages devices are described. A high voltages device is a device under test (DUT) in a double-pulse test, which may require the inductive load. The method can include in a low current, high voltage time period, estimating an inductor current contribution range after a turn on of the device-under-test connected to an inductive load with an air core inductor. The method subtracts the estimated inductor current contribution from a device-under-test collector current to output a corrected collector current. This allows the double pulse test to be conducted with an air-core inductor. Vehicles can use the DUT in traction power applications.

Claims

1. A double-pulse test method, comprising:

by a processor,

operating a device under test (DUT), coupled to an inductive load defined by an air-core inductor, according to a double-pulse test schedule; and

calculating a corrected collector current of the DUT from a difference between (i) a measured collector current of the DUT and (ii) a change in current through the air-core inductor that is based on a first sensed voltage across a supply capacitor and a second sensed voltage across the DUT.

2. The method of claim 1, wherein the change in current, di_L, the first sensed voltage, v_ce, and the second sensed voltage, v_dc, are related according to

3. The method of claim 2, wherein the inductance is about 10-80 μ

H.

4. A double-pulse test method, comprising:

by a processor,

operating a device under test (DUT), coupled to an inductive load defined by an air-core inductor, according to a double-pulse test schedule;

calculating a corrected collector current for the DUT from a difference between (i) a measured collector current of the DUT and (ii) a change in current through the air-core inductor that is based on a first voltage set as a constant to represent a supply voltage and a second sensed voltage across the DUT.

5. The method of claim 4, wherein the change in current, di_L, the first voltage, v_ce, and the second voltage, v_dc, are related according to

6. The method of claim 5, wherein the inductive load has an inductance of about 10-20 μ

H.

7. The method of claim 5, wherein the inductive load has an inductance of about 1 uH to 1 mH.