GB2275145A - Optical control of automotive electric motor - Google Patents
Optical control of automotive electric motor Download PDFInfo
- Publication number
- GB2275145A GB2275145A GB9402787A GB9402787A GB2275145A GB 2275145 A GB2275145 A GB 2275145A GB 9402787 A GB9402787 A GB 9402787A GB 9402787 A GB9402787 A GB 9402787A GB 2275145 A GB2275145 A GB 2275145A
- Authority
- GB
- United Kingdom
- Prior art keywords
- control unit
- modules
- power transistors
- driving
- optical
- 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- Withdrawn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
- 230000003287 optical effect Effects 0.000 title claims description 23
- 238000000034 method Methods 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 description 9
- 230000006378 damage Effects 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D1/00—Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots
- G05D1/0011—Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots associated with a remote control arrangement
- G05D1/0022—Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots associated with a remote control arrangement characterised by the communication link
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
- G08C23/06—Non-electrical signal transmission systems, e.g. optical systems through light guides, e.g. optical fibres
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Automation & Control Theory (AREA)
- Power Conversion In General (AREA)
- Electronic Switches (AREA)
Description
2275145 Driving of the Power Transistor Modules in Industrial Trucks The
invention relates to a process for driving the modules containing power transistors by a control unit in industrial trucks, wherein the lifting and travelling power components are controlled via these modules.
In the past such modules have been driven by a control unit by which the lifting and travelling properties of the industrial trucks are controlled and which is arranged in the immediate vicinity of the module containing the power transistors. The modules contain parallel connected power transistors with a corresponding driver circuit. To eliminate disturbances in the driving of these modules, which disturbances are caused by voltage induction in the transmission lines as a result of irradiated electromagnetic fields. the transmission lines must be kept as short as possible. Therefore the control unit and modules must be accommodated in direct proximity in the vehicle, which in turn complicates the spatial configuration in the industrial truck.
Further disadvantages are caused by the two-way influence between the control unit and the modules when disturbances arise. Voltage peaks from the control unit can destroy the sensitive power transistors! for example MOSFETs. and conversely cable breaks, or malfunctioning power transistors, can give rise to damage in the control unit.
Therefore the aim of the present invention is to develop a process with a suitable device by means of which the above mentioned difficulties and disadvantages associated with the driving of modules containing power transistors, especially in Industrial trucks.. are minimised or entirely eliminated.
This objective is achieved In accordance with the invention in that the electrical signal emitted by the control unit is converted Into an optical signal, and said optical signal Is 2 transmitted by means of an optical waveguide from the control unit to the respective module and is reconverted therein into an electrical signal.
The problems referred to in the introduction are solved by the process according to the invention: the control unit now need no longer be installed in the direct vicinity of the power modules. This provides greater freedom in the spatial configuration of the industrial truck. Lifting-, steering- and travelling power components can be controlled by a central control unit.
The optical waveguide not only facilitates the electrical isolation of control unit and power modules, but also is unaffected by electromagnetic Irradiation. This ensures electromagnetically compatible driving. Breaks or tears in the optical waveguide lead only to an interruption in the driving, which is not, as was previously the case, associated with the risk of destruction of the power transistors or the control unit. Because of the electrical isolation, a defect in the power module or voltage peaks from the control unit no longer affect the control unit or the power module respectively, so that there is no longer any risk of one- sided or mutual destruction.
In accordance with the invention, for example the electrical signal emitted by the control unit Is converted by a light-emitting diode Into an optical signal and transmitted by means of a glass fibre optical waveguide to the power module. The glass fibres transmit the optical signals without losses over the distances necessary in vehicle installations. At the end of the transmission link, by means of a phototransIstor or photocell the optical signal is converted into an electrical signal and transformed by a suitable circuit into the voltage range which must be provided for the driving of the power transistors.
In the process according to the Invention the optical signal can be transmitted In analogue form. MOSFETs are driven, for example, with a clocked voltage signal with a level of between 0 and 20 V and a clock time of approximately 5 ms in accordance with a 3 clock frequency of 200 Hz. Within these 5 ms the MOSFET is switched on and off, where the switching-on time and switching-off time are generally different. In the case of analogue transmission, light pulses of a specified intensity dependent on the voltage level are transmitted from the control unit to the MOSPET module. The length of the light pulses then corresponds to the switch-on time of the MOSFETs.
Another possibility is that of digital optical signal transmission. For example with a predetermined clock frequency, the ratio of switch-on time and switch-off time can be digitalised. A specified sequence of light pulses then forms the code which determines the switch-on time and switchoff time of the power transistors. The circuitry outlay for the signal converter units is correspondingly higher than in the case of analogue transmission.
A suitable device for the implementation of the process according to the Invention consists In that the output of the control unit is connected to an electro-optical transducer unit. the output end of which is connected via an optical waveguide to the input end of an opto-electrical transducer unit which is connected to the module containing the power transistors.
The transducer units are adapted to the analogue or digital form of transmission and can be Integrated In the control unit and/or the modules. Optical waveguides are obtainable at low cost.
In the following the process according to the invention will be explained in detail in the form of an exemplary embodiment.
Various power transistor modules used in industrial trucks, such as MOSFET modules (80 Vi 500 A), NOSFET bridge modules (6-fold for three- phase current, 200 A, 200 V) or IM bridge modules (6-fold for three-phase current. 200 Aj 200 to 600 V) can be driven by a central control unit in accordance with the process corresponding to the invention. The electrical signal emitted by the control unit is converted into an optical signal which is transmitted by plastics or glass fibre optical waveguides to the respective power transistor module. In the power transistor module the optical signal is 4 reconverted into an electrical signal by an integrated opto-electrical transducer.
Depending upon the type of module, the transmission can take place In analogue or digital form. The clock frequency may be from 160 to 200 Hz, or from 16 to 20 kHz. In the case of analogue transmission, the transistor unit is switched on by each light pulse received. In the case of digital transmission, a specified code is formed bit by bit by the setting of light pulses. -Thust for example, 256 different signals can be transmitted by 8 bits.- Such codes can be used to encode clock frequency and/or switch-on and switch-off time within a clock period.
The electrical and spatial isolation of the control unit from the power transistor unit according to the invention permits reliable operation of industrial trucks. Furthermore, greater freedom is obtained in terms of the relative spatial configuration of the vehicle components.
Claims (6)
- A process for driving the modules containing power transistors by a control unit in industrial trucks. wherein the lifting- and travelling power components are controlled via these modules, wherein the electrical signal emitted by the control unit is converted Into an optical signal, and said optical signal is conveyed by means of an optical waveguide from the control unit to the respective module and is reconverted therein into an electrical signal.
- 2. A process as claimed in Claim 1. characterised in that the optical signal is transmitted in analogue form.
- 3. A process as claimed In Claim 1, characterised in that the optical signal is transmitted in digital form.
- 4. A device for driving the modules containing power transistors by a control unit in industrial trucks, wherein the output of the control unit is connected to an electro-optical transducer unit. the output end of which is connected via an optical waveguide to the input end of an opto-electrical transducer unit which Is connected to the module containing the power transistors.
- 5. A device for driving the modules containing power transistors by a control unit in industrial trucks, substantially as described herein.
- 6. A process for driving the modules containing power transistors by a control unit In industrial trucks, substantially as described herein.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4304674A DE4304674A1 (en) | 1993-02-16 | 1993-02-16 | Control of the power transistor modules in industrial trucks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9402787D0 GB9402787D0 (en) | 1994-04-06 |
| GB2275145A true GB2275145A (en) | 1994-08-17 |
Family
ID=6480601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9402787A Withdrawn GB2275145A (en) | 1993-02-16 | 1994-02-14 | Optical control of automotive electric motor |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE4304674A1 (en) |
| FR (1) | FR2701611A1 (en) |
| GB (1) | GB2275145A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2379345A (en) * | 2001-07-21 | 2003-03-05 | Tyco Electronics Amp Gmbh | A power module with several power devices controlled through a single galvanically isolated control channel |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013230053A (en) * | 2012-04-26 | 2013-11-07 | Honda Motor Co Ltd | Power control unit |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4227075A (en) * | 1977-08-30 | 1980-10-07 | International Telephone And Telegraph Corporation | Multichannel fiber optic control system |
| US4359672A (en) * | 1981-07-10 | 1982-11-16 | Allen-Bradley Company | Motor starter with optically coupled pushbutton station |
| US4459591A (en) * | 1981-02-05 | 1984-07-10 | Robert Bosch Gmbh | Remote-control operating system and method for selectively addressing code-addressable receivers, particularly to execute switching function in automotive vehicles |
| EP0131450A2 (en) * | 1983-07-09 | 1985-01-16 | LUCAS INDUSTRIES public limited company | Automotive multiplex system |
| WO1987004303A1 (en) * | 1986-01-08 | 1987-07-16 | Horst Gehm | Electrical installation for submarines |
| EP0271763A1 (en) * | 1986-12-15 | 1988-06-22 | Heimann GmbH | Thyristor ignition device |
| US4835706A (en) * | 1986-07-16 | 1989-05-30 | Kabushiki Kaisha Toshiba | Centralized control system for controlling loads such as an electric motor |
| WO1992002981A1 (en) * | 1990-08-10 | 1992-02-20 | Smart Set Oy | Procedure for the control of an electric device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2801046B2 (en) * | 1989-12-27 | 1998-09-21 | アイシン・エィ・ダブリュ株式会社 | Power supply for electric vehicles |
-
1993
- 1993-02-16 DE DE4304674A patent/DE4304674A1/en not_active Withdrawn
-
1994
- 1994-02-14 GB GB9402787A patent/GB2275145A/en not_active Withdrawn
- 1994-02-16 FR FR9401746A patent/FR2701611A1/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4227075A (en) * | 1977-08-30 | 1980-10-07 | International Telephone And Telegraph Corporation | Multichannel fiber optic control system |
| US4459591A (en) * | 1981-02-05 | 1984-07-10 | Robert Bosch Gmbh | Remote-control operating system and method for selectively addressing code-addressable receivers, particularly to execute switching function in automotive vehicles |
| US4359672A (en) * | 1981-07-10 | 1982-11-16 | Allen-Bradley Company | Motor starter with optically coupled pushbutton station |
| EP0131450A2 (en) * | 1983-07-09 | 1985-01-16 | LUCAS INDUSTRIES public limited company | Automotive multiplex system |
| WO1987004303A1 (en) * | 1986-01-08 | 1987-07-16 | Horst Gehm | Electrical installation for submarines |
| US4835706A (en) * | 1986-07-16 | 1989-05-30 | Kabushiki Kaisha Toshiba | Centralized control system for controlling loads such as an electric motor |
| EP0271763A1 (en) * | 1986-12-15 | 1988-06-22 | Heimann GmbH | Thyristor ignition device |
| WO1992002981A1 (en) * | 1990-08-10 | 1992-02-20 | Smart Set Oy | Procedure for the control of an electric device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2379345A (en) * | 2001-07-21 | 2003-03-05 | Tyco Electronics Amp Gmbh | A power module with several power devices controlled through a single galvanically isolated control channel |
| GB2379345B (en) * | 2001-07-21 | 2004-11-17 | Tyco Electronics Amp Gmbh | Power module |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2701611A1 (en) | 1994-08-19 |
| DE4304674A1 (en) | 1994-08-18 |
| GB9402787D0 (en) | 1994-04-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |