Bus coupler with transformer-free transmission

Details Bus coupler with transformer-free transmission Bus coupler with transformer-free transmission

1999-11-22

2001-01-09

Tokar, Michael (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Output switching noise reduction

C326S090000

Reexamination Certificate

active

06172515

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a bus coupler for transformer-free transmission onto a bus carrying information and energy. The information carried by the bus coupled by the present invention consists of active pulse and, for reasons of bus efficiency, equalizing pulse for each bit/information. Such a bus appertaining to building system technology is used in particular by the European Installation Bus Association, (“EIBA”).
SUMMARY OF THE INVENTION
It is advantageous to provide a bus coupler capable of integrating with all of the components of an integrated circuit that does not use conventional transformers.
An object of the present invention is to provide a bus coupler which, in conjunction with a simple circuit arrangement, transmits active pulse and equalizing pulse.
The object is achieved by means of a bus coupler according to the present invention. A transmission valve of a transmission signal generator is coupled, in accordance with the function, to a bus conductor via a capacitance, which may be small relative to an imaginary capacitance acting as a short circuit for the active pulses of the information. A Miller circuit serves, in conjunction with two current amplifier circuits, to transform the small capacitance into a sufficiently large capacitance. This sufficiently large capacitance permits the active pulses to be transmitted in a sufficiently loss-free manner. The size of the capacitance can thus be tailored to the respective requirements. Energy stored in a further capacitance is used to generate the equalizing pulse. The active pulse and equalizing pulse are generated by means of capacitances, which occupy less space than a bus coupler with transformers, and may easily be realized in an integrated circuit. In practice, a gain by a factor of 10 can be achieved per stage by the two current amplifier circuits, resulting in a total gain of the order of magnitude of 1000. Moreover, the gain achieved by the two amplifier circuits is in phase.
A capacitor for the small capacitance may be coupled by one pole to a bus conductor of a two-core bus and by its other pole to a voltage source via a high-value resistor. The voltage source may be chosen such that its voltage generates the desired voltage of the active pulse. The Miller circuit may be coupled, together with its amplifier circuits, to ground via the transmission valve of the transmission signal generator. In this embodiment, one bus conductor may carry a positive signal and one bus conductor a negative signal and the ground may, be arranged in a freely floating manner.
A further capacitor for the further capacitance for generating the equalizing pulse may be connected by one of its poles to a bus conductor and by its other pole to the voltage source. These networks are driven in accordance with the pulse shape of the information. Such an arrangement achieves a simple circuit. It is advantageous for the capacitor for the small capacitance and the further capacitor to be connected to the bus conductor of positive polarity.


REFERENCES:
patent: 4085411 (1978-04-01), Genesi
patent: 5148055 (1992-09-01), Nohora
patent: 29 03 860 (1980-08-01), None
patent: 0 007 622 (1980-02-01), None
patent: 0 365 696 (1990-05-01), None
Happacher, M, “Das Vernetzte Eigenheim,” Sep. 5, 1995 Listed in Search Report.*

Affiliated with

Also associated with

Rating

Bus coupler with transformer-free transmission does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Bus coupler with transformer-free transmission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bus coupler with transformer-free transmission will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2509039