Patent SG-11201907675R-A (SG)
Title: Apparatus and method for detecting current overload and leakage in a transport refrigeration unit
Inventor: ZARRABI JAMAL
IPC: H02H3/08
Filed: 2017-02-28
Abstract: PCTIB/000289 (51) International Patent Classification: H02H 3/08 (2006.01) GO1R 31/26 (2014.01) (21) International Application Number: (22) International Filing Date: 28 February 2017 (28.02.2017) English English (25) Filing Language: (26) Publication Language: 204 PHASE1/11 /„.-- 302 ACTIVE FAULT DETECTION CIRCUIT 424 310 428 GN 2V (71) Applicant: CARRIER CORPORATION [US/US]; 17900 Beeline Highway, Jupiter, FL 33478 (US). (72) Inventor; and (71) Applicant (for US only): ZARRABI, Jamal [FR/FR]; 28 Jardins Des Perelles, 27700 Les Andelys (FR). (74) Agent: FOX, David, A. et al.; Cantor Colburn Llp, 20 Church Street, 22nd Floor, Hartford, CT 06103 (US). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, (54) Title: APPARATUS AND METHOD FOR DETECTING CURRENT OVERLOAD AND LEAKAGE IN A TRANSPORT RE- FRIGERATION UNIT 206 CURRENT TRANSFORMER • V 408 404 306 „ g , VOLTAGE ADAPTER CURRENT os 412 MEASUREMENT MICROCONTROLLER 314 CIRCUIT 422 ► CND VCC 8 6 tc - \" 416 VOLTAGE VOLTAGE ADAPTER REGULATOR 312 420 414 GENERATOR LOAD AGE N 2 • 322 324 426 208 214 MICROPROCESSOR 338 430 336 [' -...334 332 -x.330-216 326 C BATTERY 328 432 218 220 434 436 ON-BOARD DIAGNOSTIC UNIT DISPLAY INDICATOR(S) OVERAGE INDICATOR LEAKAGE INDICATOR FIG. 4 (57) : A system and method for detecting current overload and leakage in a transport refrigeration unit. The method comprises measuring, by a microcontroller of an active fault detection circuit, a line current for each of one or more phases supplying power to a load of a refrigerant vapor compression system of the transport refrigeration unit; measuring, by the microcontroller, a voltage received by the active fault detection circuit from a battery of the transport refrigeration unit and transmitted via a conductor of the active fault detection circuit to a microprocessor of the refrigerant vapor compression system; controlling, by the microcontroller, a switch along the conductor of the active fault detection circuit to control transmission of the voltage, via the conductor to the microprocessor, Controlling the switch comprises (i) closing the switch upon a determination that the voltage level is greater than or equal to an operational threshold voltage level, (ii) closing the switch upon a determination that the voltage level is less than the operational threshold voltage level, N O GC 00 O N C (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 07 September 2018 (07.09.2018) WIP0 I PCT 01E1°1°1a °nolo HE oimIE (10) International Publication Number WO 2018/158602 Al [Continued on next page] WO 2018/158602 Al MIDEDIM01101 DIONER13111111111111111111111111111111111111111111 TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Published: — with international search report (Art. 21(3)) and (iii) opening the switch upon a determination that any of the one or more line currents exceeds a threshold. Other embodiments are described herein.