# US 10,871,791 B2 · Battery emulator and method for controlling the battery emulator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,871,791 B2 - Document ID: US10871791B2 - Status: Granted - Kind: B2 - Application number: 15/747,040 - Filed: 2016-07-22 - Published: 2019-01-10 - Granted: 2020-12-22 - Earliest claimed: 2015-07-28 - Assignees: AVL List GmbH - Applicants: AVL LIST GmbH - Inventors: Oliver König - Web page: https://patentgrep.com/patent/US10871791B2 ## CPC - G05F 1/10: Regulating voltage or current (G05F1/02 takes precedence) - B60L 3/0023: {Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train} - G01M 13/02: Gearings; Transmission mechanisms - G01M 15/02: Details or accessories of testing apparatus - B60L 2210/10: DC to DC converters - B60L 2210/30: AC to DC converters - B60L 2240/547: Voltage - B60L 2240/549: Current - B60L 2270/40: related to technical updates when adding new parts or software - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/72: Electric energy management in electromobility - G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES - 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 - G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract In order to achieve sufficiently stable output voltage with low losses even during rapid load changes in a battery emulator, a battery emulator is controlled using model-based control with a model of the battery emulator, wherein a line inductance of the electric line and the back-up capacitor is integrated into the model of the battery emulator. ## Claims ### Claim 1 A method for controlling a battery emulator, comprising: a voltage supply having an output filter with a filter capacitor and a back-up capacitor having an output voltage applied, the back-up capacitor connected in parallel to the filter capacitor, wherein the filter capacitor is connected to the back-up capacitor with an electric line in order to physically separate the back-up capacitor from the voltage supply, the method comprising: controlling the output with a model-based control using a model of the battery emulator, wherein a line inductance of the electric line and the back-up capacitor are integrated into the model of the battery emulator. ### Claim 2 (depends on 1) The method according to claim 1, wherein a load model of an electrical test object that is powered by the battery emulator is additionally integrated into the model of the battery emulator. ### Claim 3 (depends on 2) The method according to claim 2, wherein an input capacitance of the test object is used as the load model. ### Claim 4 (depends on 2) The method according to claim 2, wherein a constant power load is used as the load model, wherein the constant power load is linearized around an operating point of the battery emulator. ### Claim 5 A battery emulator comprising: a voltage supply, having: an input-side rectifier with a direct current intermediate circuit, and a DC-DC converter that is connected to the direct current intermediate circuit, and an output filter with a filter capacitor at the output of the DC-DC converter, a back-up capacitor having an output voltage applied, an electric line connecting the filter capacitor to the back-up capacitor in order to physically separate the back-up capacitor from the voltage supply, and an emulator control unit for model-based control of the output voltage, in which a model of the battery emulator is implemented, wherein a line inductance of the electric line and the back-up capacitor are integrated into the model of the battery emulator. ### Claim 6 (depends on 5) A method of using the battery emulator according to claim 5, comprising testing an electrical test object, wherein the battery emulator is connected to the electrical test object and provides a supply voltage for the electrical test object. ### Claim 7 (depends on 6) The method according to claim 6, wherein a load model of an electrical test object is additionally integrated into the model of the battery emulator. ### Claim 8 (depends on 1) The method according to claim 1, wherein the back-up capacitor is arranged in a junction box physically separate from the voltage supply. ### Claim 9 (depends on 1) The method according to claim 1, further comprising testing an electrical test object, wherein the battery emulator is connected to the electrical test object and provides a supply voltage for the electrical test object. ### Claim 10 (depends on 5) The battery emulator according to claim 5, further comprising a junction box in which the back-up capacitor is arranged, the junction box physically separate from the voltage supply. ### Claim 11 A battery emulator for testing a test object, comprising: a voltage supply having an output filter with a filter capacitor at the output of a DC-DC converter; a back-up capacitor having an output voltage applied; an electric line connecting the filter capacitor and the back-up capacitor in order to physically separate the back-up capacitor from the voltage supply; an emulator control unit for model-based control of the output voltage, the emulator control unit implementing a model of the battery emulator that integrates a line inductance of the electric line and the back-up capacitor. ### Claim 12 (depends on 11) The battery emulator according to claim 11, further comprising a junction box in which the back-up capacitor is arranged, the junction box physically separate from the voltage supply. ### Claim 13 (depends on 11) The battery emulator according to claim 11, wherein the model of the battery emulator comprises a load model of an electrical test object that is powered by the battery emulator. ### Claim 14 (depends on 13) The battery emulator according to claim 13, wherein a constant power load is used as the load model, wherein the constant power load is linearized around an operating point of the battery emulator. ### Claim 15 (depends on 11) A method of using the battery emulator according to claim 11, comprising testing an electrical test object, wherein the battery emulator is connected to the electrical test object and provides a supply voltage for the electrical test object. ### Claim 16 (depends on 11) A test bench, comprising the battery emulator according to claim 11. ### Claim 17 (depends on 16) A method of using the test bench according to claim 16, comprising: connecting a test object on the test bench to the battery emulator; controlling supply voltage to the test object. ### Claim 18 (depends on 17) The method according to claim 17, wherein the test object comprises a hybrid drive train.