Electricity: single generator systems – Automatic control of generator or driving means – Voltage of generator or circuit supplied
Patent
1999-05-17
2000-12-19
Ponomarenko, Nicholas
Electricity: single generator systems
Automatic control of generator or driving means
Voltage of generator or circuit supplied
322 25, H02P 914
Patent
active
061631388
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates to a device for regulating the output voltage of a rotary current generator as generically defined by the preamble to the main claim.
In conventional power supply systems today in a motor vehicle, a rotary current generator is used whose exciter current is regulated with the aid of a voltage regulator in such a way that the output voltage of the generator maintains a predeterminable value. In a first type of circuitry, the exciter current is generated with the aid of exciter diodes. The exciter current flows through the exciter winding and the regulating transistor, which is influenced by a control portion of the voltage regulator. A power supply system of this kind in a motor vehicle is also known as a D+ system and is known for instance from German Published, Non-Examined Patent Application DE-OS 34 02 288.
In other power supply systems in motor vehicles, the exciter winding is connected to the generator output B+, at which the output voltage generated by the generator appears. In such a B+ system, regulating the exciter current is again done with the aid of a voltage regulator, which is then designed as a so-called multifunction regulator and includes a power transistor, which is triggered by the control portion of the voltage regulator as a function of the information supplied, in such a way that the output voltage occurring at the B+ terminal of the generator always has the desired value. A generator and voltage regulator system that includes a multifunction regulator and has no exciter diodes is known for instance from German Patent Application DE-P 19 532 297.5.
The device according to the invention for regulating the output voltage of a rotary current generator as defined by the characteristics of claim 1 has the advantage that even if a D+ regulator is used, the exciter diodes can be omitted. Thus a generator and voltage regulator system can be designed that takes conventional D+ regulators as its point of departure and is compatible with B+ voltage regulators that also are already available. The very low resting current takeup that can be attained is advantageous.
Another advantage is that subsequent damage protection in the event of system errors is obtained, so that the battery is for instance prevented from running dry in the event of uncontrolled full excitation. Another advantage is that emergency regulation can be performed, which intervenes in the event of uncontrolled full excitation and terminates this excitation. There is also high voltage strength even in the load dump situation. Another advantage is protection that occurs in the event of a field short circuit, or in other words an erroneous connection of the exciter winding to ground.
These advantage are attained by the device for regulating the output voltage of a rotary current generator having the characteristics of claim 1. In such a device, a conventional D+ regulator, which typically includes a monolith regulator IC, is connected to the B+ terminal of the generator via a so-called smart power high-side switch. This switch is preferably designed as an MOS transistor with an integrated periphery and represents a second integrated circuit. The exciter current flows to ground via the switch, the exciter winding and the regulating transistor. It is possible to influence the current through the exciter winding by means of both integrated circuit independently of one another, as a function of supplied information.
Further advantages of the invention can be attained with the refinements defined by the dependent claims.
DRAWING
One exemplary embodiment of the invention is shown in FIG. 1 of the drawing and will be explained in further detail below.
FIG. 2 shows a substitute circuit diagram for the regulator.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
The rotary current generator 10 shown in FIG. 1 is intended for operation in motor vehicles and cooperates with the regulator 11. The output voltage of the rotary current generator 10 is designed UB+ and is tapped at the terminal B+ and serves to supply th
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Jacob Wolfgang
Kohl Walter
Ponomarenko Nicholas
Robert & Bosch GmbH
Striker Michael J.
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