Electricity: single generator systems – With signals – indicators – recorders – testing – etc.
Reexamination Certificate
2000-12-15
2004-03-02
Mullins, Burton S. (Department: 2834)
Electricity: single generator systems
With signals, indicators, recorders, testing, etc.
C322S044000, C322S058000, C322S059000, C322S069000, C322S070000, C439S620040
Reexamination Certificate
active
06700357
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
The present invention is related to Japanese patent application No. Hei. 11-357627, filed Dec. 16, 1999; 2000-316455, filed Oct. 17, 2000, the contents of which are incorporated herein by reference.
FIELD OF THE INVENTNION
The invention relates to a control device for a vehicular AC generator, and more particularly, to a control device for a vehicular AC generator having a connector with an electromagnetic wave noise preventing function.
BACKGROUND OF THE INVENTION
In recent years, there has been an increase in high frequency electromagnetic field in vehicles as portable telephones and navigation systems prevail.
Since influences given to electronic equipment by electromagnetic waves of a particular intensity increase with an increase in frequency, there is a demand to reduce adverse influences given to a control device for a vehicular AC generator, by high frequency radio waves used in portable telephones or the like. At the same time, there is a demand to reduce adverse influence given to on-board electronic devices, the above-mentioned portable telephones and navigation systems, by electromagnetic wave noises, which are generated from a control device (also, referred to as a regulator) for a vehicular AC generator. Much of these electromagnetic wave noises flows through wiring inside and outside the electronic devices and adversely affects the operation of elements in the electronic devices. Such wiring inducing noises are called hereinafter line superposed noises.
It has been conventionally known to mount and connect ferrite ring cores, feed-through capacitors, bypass capacitors or the like to wiring to reduce such line superposed noises. These elements constitute a low-pass filter composed of line inductance or wiring resistance and bypass capacitance including parasitic capacitance, and shut off or reduce high frequency electromagnetic wave noises.
For example, Japanese Patent Laid-Open No. 190620/1993 proposes a connector having an electromagnetic wave noise preventing function and housing therein or fixing integrally thereto a cylindrical-shaped noise absorbing member, which surrounds terminals of the connector and comprises ferrite ring cores or feed-through capacitors.
Also, Japanese Patent Laid-Open No. 29042/1993 proposes pressure fitting and fixing ferrite ring cores to a wall portion of a housing to have the ferrite ring cores surrounding terminals of a connector fixed to the wall portion.
Further, Japanese Patent Laid-Open No. 115737/1995 proposes suppressing entry of electromagnetic wave noises from a L terminal by providing a bypass capacitor between a pair of positive and negative input ends of a comparator for comparison and determination of battery voltage fluctuations of a control device (referred below to as a regulator) for a vehicular AC generator.
A conventional regulator for a vehicular AC generator comprises an output circuit unit including a switching transistor connected at one end thereof to one end of a battery through a field coil of the vehicular AC generator and at the other end thereof to the other end of the battery. This regulator performs intermittent control of current conducted to the field coil. An internal electric source circuit unit is supplied with electricity from the battery to form an internal electric source voltage. A switching transistor control circuit unit is actuated by the internal electric source voltage and performs intermittent control of the switching transistor based on battery voltage and a predetermined target voltage. A battery voltage supplying terminal is connected to a high potential end of the battery for supplying electricity to the internal electric source circuit unit via an internal electric source line. A battery voltage detecting terminal is connected to a high potential end of the battery for permitting voltage of the battery to be input into the switching transistor control circuit unit through an internal battery voltage detection line. An IG ON detection terminal connected to one end of an ignition switch to permit voltage change caused by the ignition switch to be input into the switching transistor control circuit unit through an IG ON detection line. The control device is fixed to the vehicular AC generator.
Experiments performed by the inventors of this application have revealed that with the constitution disclosed by the above-mentioned Japanese Patent Laid-Open No. 115737/1995, in which a bypass capacitor is used to reduce electromagnetic wave noises entering from a L terminal serving also as an IG terminal of a regulator, the effect of reducing entry of electromagnetic wave noises into the regulator is restricted, and such constitution is not effective in reduction of electromagnetic wave noises generated from the regulator. This is because the regulator includes a number of wires and thus paths of entry and irradiation of electromagnetic wave noises from the regulator.
Of course, if ferrite ring cores and bypass capacitors are provided for all wires of the regulator, it is possible to reduce electromagnetic wave noise entering the regulator via these wires. However, the provision of ferrite ring cores and bypass capacitors on all wires of a regulator mounted on an on-board vehicular AC generator is impossible in terms of cost and allowable installation space. In particular, since a regulator mounted on a vehicular AC generator disposed near an internal combustion engine is used during high temperature and intense vibrations, bypass capacitors of large capacity with an adequate noise reducing performance must have heat resistant and vibration resistant qualities and be large in size, which presents a further problem in terms of cost and an installation space.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a control device for a vehicular AC generator, preventing entry of electromagnetic wave noises while suppressing an increase in physical dimensions, and a connector suitable for application to the device.
A control device for a vehicular AC generator, in a first aspect comprises a field current switching circuit unit having a switching transistor switching current conducted to a field coil, a switching transistor control circuit unit for performing intermittent control of the switching transistor based on a battery voltage and a predetermined target voltage, an internal electric source circuit that uses electricity supplied from the battery to form an internal electric source voltage applied to the switching transistor control circuit unit, a casing containing ICs mold-sealed by the respective circuit units, a battery voltage supplying terminal for supplying electricity to the internal electric source circuit unit from the battery via an internal electric source line, and a magnetic body mounted to the internal electric source line or the battery voltage supplying terminal, and in the control device, the battery voltage supplying terminal and the magnetic body are fixed to the casing.
A second aspect of the invention uses a field current switching circuit unit having a switching transistor for performing switching control of current conducted to a field coil, a switching transistor control circuit unit for performing intermittent control of the switching transistor based on a battery voltage and a predetermined target voltage, an internal electric source circuit unit for using electricity supplied from the battery to form an internal electric source voltage being applied to the switching transistor control circuit unit, a casing containing therein ICs mold-sealed by the respective circuit units or the respective circuit units, a battery voltage supplying terminal for supplying electricity to the internal electric source circuit unit from the battery via an internal electric source line, and an inductance element connected in series to the internal electric source line. In the control device, the battery voltage supplying terminal and the inductance element are fixed to the casing.
Another aspect of the invention co
Cuevas Pedro J.
Denso Corporation
Mullins Burton S.
Oliff & Berridg,e PLC
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