# US 10,310,002 B2 · Apparatus and method for detecting leakage current of high-power line of inverter of 48V mild hybrid system

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- Number: US 10,310,002 B2
- Document ID: US10310002B2
- Status: Granted
- Kind: B2
- Application number: 15/638,301
- Filed: 2017-06-29
- Published: 2018-05-24
- Granted: 2019-06-04
- Earliest claimed: 2016-11-18
- Assignees: Hyundai Mobis Co., Ltd.
- Applicants: Hyundai Mobis Co., Ltd.
- Inventors: Sang Min Kim
- Web page: https://patentgrep.com/patent/US10310002B2

## CPC

- G01R 31/42: AC power supplies
- B60K 6/485: Motor-assist type
- B60W 10/06: including control of combustion engines
- B60W 10/08: including control of electric propulsion units, e.g. motors or generators
- B60W 10/26: for electrical energy, e.g. batteries or capacitors
- B60W 20/15: Control strategies specially adapted for achieving a particular effect
- G01R 31/3008: {Quiescent current [IDDQ] test or leakage current test}
- G01R 31/40: Testing power supplies (testing photovoltaic devices H02S50/10)
- G01R 31/52: Testing for short-circuits, leakage current or ground faults
- B60W 2710/086: Power
- Y02T 10/62: Hybrid vehicles
- 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 90/14: Plug-in electric vehicles
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Provided are an apparatus and method for detecting a leakage current of a high-power line of an inverter of a 48V mild hybrid system. The apparatus includes a starter generator manufactured as a synchronous motor, in which a conventional field winding is wound around a rotor, and configured to generate starting torque and generating torque for an engine, a 48V battery configured to supply a 48V direct current (DC) power and be charged by the starter generator, a 12V battery configured to supply power to internal electrical components of a vehicle, an integrated starter generator (ISG) control inverter provided between the starter generator and the 48V battery and provided as a power semiconductor switch which controls a stator and the rotor of the starter generator, wherein a winding output from the inverter is connected to the rotor through a brush and a slip ring, a DC-DC converter configured to convert the power of the 48V battery into 12V battery power and supply the 12V power, a common mode (CM) choke provided between the ISG control inverter and the 48V battery, and a leakage current detector connected to the CM choke and configured to detect a leakage current.

## Claims

### Claim 1

An apparatus for detecting a leakage current of a high-power line of an inverter of a 48V mild hybrid system, the apparatus comprising:
a starter generator manufactured as a synchronous motor, in which a conventional field winding is wound around a rotor, and configured to generate starting torque and generating torque for an engine;
a 48V battery configured to supply 48V direct current (DC) power and be charged by the starter generator;
a 12V battery configured to supply power to internal electrical components of a vehicle;
an integrated starter generator (ISG) control inverter provided between the starter generator and the 48V battery and provided as a power semiconductor switch which controls a stator and the rotor of the starter generator, wherein a winding output from the inverter is connected to the rotor through a brush and a slip ring;
a DC-DC converter configured to convert the power of the 48V battery into 12V battery power and supply the 12V power;
a common mode (CM) choke provided between the ISG control inverter and the 48V battery;
a leakage current detector connected to the CM choke and configured to detect a leakage current; and
a memory and a processor,
wherein:
the leakage current detector outputs a detected leakage voltage; and
the processor measures the leakage current by integrating the output leakage voltage.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein:
the CM choke includes an additional winding; and
when a wire connected to the inverter is disconnected, the additional winding is induced by an induced electromotive force and a leakage voltage is generated.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein the leakage current detector includes:
a diode rectifier configured to rectify a leakage voltage generated in the CM choke;
a comparator configured to compare the rectified voltage to a preset test voltage; and
a determiner configured to determine whether a leakage current is generated according to a result of the comparison.

### Claim 4

A method of detecting a leakage current of a high-power line of an inverter of a 48V mild hybrid system, the method comprising:
generating, by a starter generator, starting torque and generating torque for an engine;
supplying, by an ISG control inverter, 48V DC power from the generated generating torque to a 48V battery;
supplying, by a DC-DC converter, the 48V DC power to a 12V battery;
allowing a wire of the inverter to be disconnected and a leakage voltage to be generated in a CM choke due to an induced electromotive force;
measuring the leakage voltage; and
detecting a leakage current from the leakage voltage,
wherein the detecting of the leakage current includes measuring the leakage current by integrating the detected leakage voltage.

### Claim 5 (depends on 4)

The method of claim 4, wherein, in the generating of the leakage voltage, when a wire connected to the inverter is disconnected, a CM choke including an additional winding is induced by an induced electromotive force, the leakage voltage is generated, and the leakage voltage is transmitted to a leakage current detector through the additional winding.

### Claim 6 (depends on 4)

The method of claim 4, wherein the detecting of the leakage current includes:
rectifying, by a diode rectifier, the leakage voltage generated in the CM choke;
comparing, by a comparator, the rectified voltage to a preset test voltage; and
determining whether a leakage current is generated according to a result of the comparison.