# US 2018/0026543 A1 · Apparatus and method for controlling synchronizing rectifier of ldc > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0026543 A1 - Document ID: US20180026543A1 - Status: Published application - Kind: A1 - Application number: 15/349,770 - Filed: 2016-11-11 - Published: 2018-01-25 - Earliest claimed: 2016-07-20 - Assignees: Hyundai Motor Company; Kia Motors Corporation - Applicants: Hyundai Motor Company; Kia Motors Corporation - Inventors: Dae Woong HAN; Jeong Bin YIM; Jae Hwa JEON; Sang Kyu LEE - Web page: https://patentgrep.com/patent/US20180026543A1 ## CPC - H02M 3/33592: {having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer} - B60L 50/60: using power supplied by batteries (in combination with fuel cells B60L50/75) - Y02B 70/10: Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors - Y02T 10/92: Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles - Y02T 90/14: Plug-in electric vehicles - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An apparatus for controlling a synchronizing rectifier of a low voltage direct current (DC)-DC converter (LDC) may include a receiver receiving an LDC output command voltage, and a controller controlling an operation of the synchronizing rectifier based on the received LDC output command voltage. ## Claims ### Claim 1 An apparatus for controlling a synchronizing rectifier of a voltage direct current (DC)-DC converter, comprising: a receiver receiving an output command voltage; and a controller controlling an operation of the synchronizing rectifier based on the received output command voltage wherein the controller operates the synchronizing rectifier when the controller determines that the output command voltage exceeds a threshold value. ### Claim 2 (depends on 1) The apparatus for controlling the synchronizing rectifier of the converter according to claim 1, wherein the controller stops an operation of the synchronizing rectifier when the output command voltage does not exceed the threshold value. ### Claim 3 (depends on 2) The apparatus for controlling the synchronizing rectifier of the converter according to claim 2, wherein the controller again operates the synchronizing rectifier that is in a stop state when an output command voltage exceeding the threshold value is newly received. ### Claim 4 A method for controlling a synchronizing rectifier of a voltage direct current (DC)-DC converter, the method comprising: receiving, by a receiver, an output command voltage; and controlling, by a controller, an operation of the synchronizing rectifier based on the received output command voltage, wherein the controlling includes operating, by the controller, the synchronizing rectifier when the controller determines that the output command voltage exceeds a threshold value. ### Claim 5 (depends on 4) The method for controlling the synchronizing rectifier of the converter according to claim 4, wherein the controlling further includes: stopping, by the controller, an operation of the synchronizing rectifier when the output command voltage does not exceed the threshold value. ### Claim 6 (depends on 5) The method for controlling the synchronizing rectifier of the converter according to claim 5, wherein the controlling includes again operating the synchronizing rectifier that is in a stop state when an output command voltage exceeding the threshold value is newly received. ### Claim 7 (depends on 1) The apparatus for controlling the synchronizing rectifier of the converter according to claim 1, wherein the output command voltage is determined based on a driving condition of a vehicle. ### Claim 8 (depends on 7) The apparatus for controlling the synchronizing rectifier of the converter according to claim 7, wherein the driving condition includes a vehicle stop mode, a deceleration mode, an electrical vehicle mode, a hybrid electrical vehicle mode, a parking mode, and a reverse mode. ### Claim 9 (depends on 7) The apparatus for controlling the synchronizing rectifier of the converter according to claim 7, wherein the output command voltage is determined by a hybrid control unit. ### Claim 10 (depends on 4) The method for controlling the synchronizing rectifier of the converter according to claim 4, wherein the output command voltage is determined based on a driving condition of a vehicle. ### Claim 11 (depends on 10) The method for controlling the synchronizing rectifier of the converter according to claim 10, wherein the driving condition includes a vehicle stop mode, a deceleration mode, an electrical vehicle mode, a hybrid electrical vehicle mode, a parking mode, and a reverse mode. ### Claim 12 (depends on 10) The method for controlling the synchronizing rectifier of the converter according to claim 10, wherein the output command voltage is determined by a hybrid control unit.