GB2546168A - Shield protection device for a shield of a high voltage cable of a motor vehicle, motor vehicle and a method for operating a shield protection device - Google Patents
Shield protection device for a shield of a high voltage cable of a motor vehicle, motor vehicle and a method for operating a shield protection device Download PDFInfo
- Publication number
- GB2546168A GB2546168A GB1621350.6A GB201621350A GB2546168A GB 2546168 A GB2546168 A GB 2546168A GB 201621350 A GB201621350 A GB 201621350A GB 2546168 A GB2546168 A GB 2546168A
- Authority
- GB
- United Kingdom
- Prior art keywords
- shield
- protection device
- motor vehicle
- high voltage
- operational amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0069—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to the isolation, e.g. ground fault or leak current
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
A shield protection device 10 for a shield 12 of a high voltage (HV) cable of a motor vehicle, wherein the HV cable connects a first HV component with a second HV component of the motor vehicle and wherein a first end and a second end of the shield are connected to a separate ground terminal a, b of a chassis 14 of the motor vehicle. The shield protection device includes a capacitor 18 and an operational amplifier 20 (e.g. a 741 OPAMP 26). The capacitor is connected between the first end and the corresponding ground terminal or the second end and the corresponding ground terminal in order to reduce a low voltage current through the shield. Input terminals 22 of the operational amplifier are connected to the ground terminals and an output 24 voltage from the operational amplifier is injected into the capacitor. The gain value of the operation amplifier may less than 1, especially 0.9. The input terminals of the operational amplifier may be connected to the ground terminals such that the operational amplifier is used an inverting amplifier.
Description
Shield protection device for a shield of a high voltage cable of a motor vehicle, motor vehicle and a method for operating a shield protection device
The invention relates to a shield protection device for a shield of a high voltage cable of a motor vehicle. The high voltage cable is designed to connect a first high voltage component with a second high voltage component of the motor vehicle. Each of a first end and a second end of the shield are connectable to a separate ground terminal of the motor vehicle. A capacitor of the shield protection device is connectable between the first end and the corresponding ground terminal or the second end and the corresponding ground terminal in order to reduce a low voltage current through the shield. The invention further relates to a motor vehicle and a method for operating a shield protection device for a shield of a high voltage cable of a motor vehicle.
It is known that low voltage current flowing through the shields of a high voltage cable can cause heating up and degrading the shields for the high voltage cables. For that the DE 10 2015 011 001 A1 relates to a method for protecting a first high voltage component having a second high voltage component connecting sheath cable in a motor vehicle. For that a repeated voltage through the sheath cable is measured repeatedly. The invention provides that at least a first delta value of an at least partially through a first ground line between the first high voltage component and a ground potential flowing first current and at least a second delta value of an at least partially through a second ground line between the second high voltage component and a ground potential flowing second current and from the repeated measurements of voltage at least a third delta value is determined. And a respective effective equivalent resistance is provided from a resistor for the first ground line and the second ground line and the basis of by the delta values. The first current and/or the second stream is limited in each case, if the respective equivalent resistance is higher than the predetermined threshold.
Furthermore it is known that placing a capacitor in series with a shield of the high voltage cable is done to eliminate the flow of the DC current through the shield. This method has a serious drawback because there is no voltage control through the shield. During transient period, the capacitor charges to its maximum and during that state it won’t allow any electromagnetic interference current to pass through it if the electromagnetic interference current tries to charge the capacitor.
It is an object of the present invention to provide a shield protection device, a motor vehicle and a method for operating a shield protection device that a DC current through the shield is reduced.
This object is solved by a shield protection device, a motor vehicle and a method for operating a shield protection device having the features of the independent claims. Advantageous embodiments with expedient developments of the invention are indicated in the dependent claims.
The shield protection device for a shield of a high voltage cable of a motor vehicle, wherein the high voltage cable is designed to connect a first high voltage component with a second high voltage component of the motor vehicle comprises at least a first end and a second end of the shield. Each of the first end and the second end of the shield are connectable to a separate ground terminal of the motor vehicle. A capacitor of the shield protection device is connectable between the first end and the corresponding ground terminal and the second end and the corresponding ground terminal.
An essential core of the invention is, that the shield protection device comprises an operational amplifier, wherein the operational amplifier is connected to the capacitor. An output voltage of the operational amplifier is injectable to the capacitor. Input terminals of the operational amplifier are connectable to the ground terminals. This allows the shield protection device to reduce the DC current through the shield of the high voltage cable.
In other words the invention is intended to reduce low voltage current flowing through the shield of the high voltage cable since the grounding point/terminals are the same. The shield current will result in heating up the high voltage cable shields and tripping off the circuit. To avoid this an operational amplifier circuit is used and the output voltage of the operational amplifier is connected to the capacitor. The capacitor is connected in series with the shield of the high voltage cables. The voltage across the capacitor will in turn reduce the DC current flowing through the shield of the high voltage cables.
In an advantageous embodiment of the invention a gain value of the operational amplifier can be less than one, especially 0.9. The exact gain value can depend on the maximum electromagnetic interference voltage that comes in the shield. By introducing the capacitor, shield current is reduced.
In a further advantageous embodiment the operational amplifier can be an OPAMP 741 operational amplifier. The OPAMP 741 operational amplifier is probably the most known integrated circuit available. It is a linear amplifier with an amazing variety of uses. Its main purpose is to amplify (increase) a weak signal. It can be used as an inverting amplifier or a non-inverting amplifier. This OPAMP has the advantage that it is very versatile and very cheap replaceable.
The invention also relates to a motor vehicle including a chassis, a shield protection device according to one of the claims 1 to 3 and a high voltage cable, wherein the shield protection device is connected to the shield of the high voltage cable.
In an advantageous embodiment of the motor vehicle, the input terminals of the operational amplifier are connected to the ground terminals of the chassis in such a way that the operational amplifier is usable invertingly. The inputs of the inverting amplifier are swept to avoid inverting of a signal in the output point.
The invention also relates to a method for operating a shield protection device for a shield of a high voltage cable of a motor vehicle. The high voltage cable is connecting a first high voltage component with a second high voltage component of the motor vehicle. Each of a first and a second end of the shield are connected to separate ground terminal of the motor vehicle. A capacitor of the shield protection device is connected between the first end and the corresponding ground terminal of the second end and the corresponding ground terminal in order to reduce a low voltage current through the shield. It is inventually that a voltage between the ground terminals is amplified by an operational amplifier. The amplified voltage is injected into the capacitor.
Advantages and embodiments of the shield protection device are to be considered as advantages and embodiments of the motor vehicle and the method for operating a shield protection device.
Further advantages, features, and details of the invention derive from the following description of a preferred embodiment as well as from the drawing. The features and feature combinations previously mentioned in the description as well as the features and feature combinations mentioned in the following description of the figure and/or shown in the figure alone can be employed not only in the respectively indicated combination but also in other combination or taken alone without leaving the scope of the invention.
The drawing shows in:
Fig. a schematic circuit with the shield protection device in a motor vehicle.
The figure shows a schematic electrical circuit with a shield protection device 10. This electrical circuit can be built in a high voltage and a low voltage electrical circuit of a motor vehicle, which can be hybrid electrical car. A shield 12 of high voltage component could be connected to a chassis 14 of a car body by using ground straps 16. The purpose of the shield 12 is to mitigate electromagnetic interference coming from high voltage components. Low voltage components can also be connected to the chassis 14.
Returned current from the low voltage components can pass through the chassis 14 and some component of current can pass through the high voltage component since the high voltage component is grounded. The low voltage current flowing through the shield 12 of the high voltage cable can heat up the high voltage cable and degrade the shield 12.
In the figure the shield 12, the chassis 14 and the ground straps 16 are illustrated as resistors. The shield 12 provides a resistor Rshieid.
The chassis 14 provides three resistors RChassisi, Rehash, RChassis3· The ground strap 16 consists of a resistor Rg.
In order to reduce the current through the shield 12 and for that heating up the high voltage cable and degrade the high voltage shield 12 a capacitor 18 is built in series with the shield 12. The point A and B are ground terminals of the shield 12 which are connected to the chassis 14 of the car. The capacitor 18 is connected in series with the shield 12 and the ground strap 16. In order to inject a voltage into the capacitor 18 the capacitor 18 is connected to an operational amplifier 20.
The operational amplifier 20 is connected in that, the input terminals 22 of the operational amplifier 20 are connected to the ground terminals A,B. Furthermore the output 24 of the operational amplifier 20 is connected to the capacitor 18, in order to inject the output 24 voltage of the operational amplifier 20 to the capacitor 18. Furthermore the operational amplifier 20 is connected such that the operational amplifier 20 is usable as an inverting amplifier. For that the operational amplifier 20 comprises a resistor R,n of the operational amplifier 20, which is connected in series between the ground terminal B and one of an input terminal 22 and an further resistor Rf of the operational amplifier 20, which is connected to the resistor from the operational amplifier Rin and which is connected to one of the input terminals 22 of the inverting amplifier 20 and which is connected to the output 24. The input terminals 22 are swapped to avoid inverting of signal in the output 24. The operational amplifier 20 especially comprises an OPAMP 741 amplifier 26. For that the OPAMP 741 provides a voltage supply 28.
The gain value of the operational amplifier 20 is made less than one especially 0.9. The exact gain will depend on the maximum electromagnetic interference voltage that comes in by the shield 12. By introducing the capacitor 18, the shield can't get reused.
The circuit from the Fig. follows the following equations:
With:
Vc = Voltage across the capacitor; VRchassis2 = Voltage through the RChassis2;
Va = Voltage at point A;
Vb = Voltage at pont B;
Vnoise = Voltage induced in shield because auf electromagnetic interference;
Vs = Voltage across the capacitor R = Rg + Rshield + Rg;
The current that would have flown through shield 12 without voltage injection:
/ = (Va — Vb — Vnoise) h- R
The current that would flow through the shield 12 with voltage injection:
/ = (0.1 x (Va - Vb) - Vnoise) -h R
By that the shield current can be reduced by almost 90%. By adjusting the gain of the operational amplifier 20, the shield current can still be reduced.
List of reference signs 10 Shield protection device 12 Shield 14 Chassis 16 Ground strap 18 Capacitor 20 Operational amplifier 22 Input terminals 24 Output 26 OPAMP 741 28 Voltage supply
Rshieid Resistor shield
Rchassis 1 Resistor chassis
Rchassis 2 Resistor chassis
Rchassis 3 Resistor chassis
Rg Resistor ground strap
Rin Resistor OPAMP
Rf Resistor OPAMP A Ground terminal B Ground terminal
Claims (6)
1. Shield protection device (10) for a shield (12) of a high voltage cable of a motor vehicle, wherein the high voltage cable is designed to connect a first high voltage component with a second high voltage component of the motor vehicle, and wherein each of a first end and a second end of the shield (12) are connectable to a separate ground terminal (A, B) of the motor vehicle, and wherein a capacitor (18) of the shield protection device (10) is connectable between the first end and the corresponding ground terminal (A, B) or the second end and the corresponding ground terminal (A, B) in order to reduce a low voltage current through the shield (12), characterized in that, the shield protection device (10) comprises an operational amplifier (20), wherein the operational amplifier (20) is connected to the capacitor (18), so that an output (24) voltage of the operational amplifier (20) is injectable to the capacitor (18), and input terminals (22) of the operational amplifier (20) are connectable to the ground terminals (A, B).
2. Shield protection device (10) in accordance with claim 1, characterized in that, a gain value of the operational amplifier (20) is less than 1, especially 0,9.
3. Shield protection device (10) in accordance to one of the preceding claims, characterized in that, the operational amplifier (20) is an OPAMP 741 (26) operational amplifier (20).
4. Motor vehicle including a chassis (14), a shield protection device (10) according to one of the claims 1 to 3 and a high voltage cable, wherein the shield protection device (10) is connected to the shield (12) of the high voltage cable.
5. Motor vehicle in accordance with claim 4, characterized in that, the input terminals (22) of the operational amplifier (20) are connected to the ground terminals (A, B) of the chassis (14) in such a way that the operational amplifier (20) is usable invertingly.
6. Method for operating a shield protection device (10) for a shield (12) of a high voltage cable of a motor vehicle, wherein the high voltage cable is connecting a first high voltage component with a second high voltage component of the motor vehicle, and wherein each of a first end and a second end of the shield (12) are connected to a separate ground terminal (A, B) of the motor vehicle, and wherein a capacitor (18) of the shield protection device (10) is connected between the first end and the corresponding ground terminal (A, B) or the second end and the corresponding ground terminal (A, B) in order to reduce a low voltage current through the shield (12), characterized by, - amplifying a voltage between the ground terminals (A, B) by an operational amplifier (20) and - injecting the amplified voltage into the capacitor (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1621350.6A GB2546168A (en) | 2016-12-15 | 2016-12-15 | Shield protection device for a shield of a high voltage cable of a motor vehicle, motor vehicle and a method for operating a shield protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1621350.6A GB2546168A (en) | 2016-12-15 | 2016-12-15 | Shield protection device for a shield of a high voltage cable of a motor vehicle, motor vehicle and a method for operating a shield protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201621350D0 GB201621350D0 (en) | 2017-02-01 |
| GB2546168A true GB2546168A (en) | 2017-07-12 |
Family
ID=58284361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1621350.6A Withdrawn GB2546168A (en) | 2016-12-15 | 2016-12-15 | Shield protection device for a shield of a high voltage cable of a motor vehicle, motor vehicle and a method for operating a shield protection device |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2546168A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010122097A (en) * | 2008-11-20 | 2010-06-03 | Toshiba Corp | Semiconductor integrated circuit device and probe card |
| US20100243321A1 (en) * | 2009-03-30 | 2010-09-30 | Yazaki Corporation | Motor cable assembly and method of manufacturing cable main body of the same |
| DE102014018462A1 (en) * | 2014-12-12 | 2016-06-16 | Audi Ag | Drive device for a hybrid-powered motor vehicle |
-
2016
- 2016-12-15 GB GB1621350.6A patent/GB2546168A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010122097A (en) * | 2008-11-20 | 2010-06-03 | Toshiba Corp | Semiconductor integrated circuit device and probe card |
| US20100243321A1 (en) * | 2009-03-30 | 2010-09-30 | Yazaki Corporation | Motor cable assembly and method of manufacturing cable main body of the same |
| DE102014018462A1 (en) * | 2014-12-12 | 2016-06-16 | Audi Ag | Drive device for a hybrid-powered motor vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201621350D0 (en) | 2017-02-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8525529B2 (en) | Impedance detection circuit and adjustment method of impedance detection circuit | |
| US10564186B2 (en) | Current sense amplifier architecture and level shifter | |
| EP1156583A2 (en) | Amplification circuit for electric charge type sensor | |
| EP2899882B1 (en) | Noise sensor | |
| US20170040467A1 (en) | Optical module | |
| GB2546168A (en) | Shield protection device for a shield of a high voltage cable of a motor vehicle, motor vehicle and a method for operating a shield protection device | |
| CN103023331B (en) | The isolated measure voltage & current control circuit of high-voltage switch power supply | |
| CN207488360U (en) | A kind of light-coupled isolation overvoltage detection circuit of vehicle power supply | |
| US10097146B2 (en) | Ripple reduction method for chopper amplifiers | |
| Jeong et al. | Design of effective surge protection circuits for an active EMI filter | |
| JP7012254B2 (en) | Communication device | |
| CN107107850B (en) | The monitoring device of at least one firing circuit of the personal protection means for vehicle and method for device for monitoring running | |
| CN111295571B (en) | Lightning protection device for differential inputs and improved method | |
| US20180003521A1 (en) | Sensor unit, sensing and analysis device with such a sensor unit and motor vehicle or trailer therewith and method for protecting an analyzer | |
| US20140347023A1 (en) | Semiconductor integrated circuit | |
| KR20110077385A (en) | Power stabilization circle for electric components of a vehicle | |
| JP5827176B2 (en) | Voltage follower input type differential amplifier | |
| US8901918B2 (en) | Load connection state detection circuit | |
| JP6239171B1 (en) | Power converter | |
| US20220094309A1 (en) | Signal detection circuit | |
| CN205750618U (en) | Pwm control signal transmitting device in a kind of strong electromagnetic interference environment | |
| CN210258300U (en) | Input protection circuit of electronic equipment of vehicle and vehicle | |
| EP2891179A1 (en) | Protection circuit and method for protecting a circuit | |
| US11444454B2 (en) | Rectifier-based surge protection circuit | |
| US20040100744A1 (en) | Electrostatic discharge circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |