Arrangement comprising an electrical printed-circuit board and a

Details Arrangement comprising an electrical printed-circuit board and a Arrangement comprising an electrical printed-circuit board and a

1999-01-11

2000-12-05

Patel, Harshad

Measuring and testing

Fluid pressure gauge

Mounting and connection

73756, G01L 700, G01L 900

Patent

active

061551198

DESCRIPTION:

BRIEF SUMMARY
The invention relates to an arrangement made up of an electrical circuit board and an electrical pressure transducer which has, in a housing, a pressure sensor onto which the pressure to be measured is transferred by means of a fluid through a channel leading into the housing, and from which there proceed electrical lines which project out of the housing as leads and are connected to the circuit board. A "fluid" here is understood to be a gaseous medium or a liquid, the gaseous medium (in particular air) being the preferred application. Connection between the pressure transducer and the circuit board is usually accomplished by pushing the leads through holes in the circuit board and soldering them to the underside of the circuit board, and partially also to the upper side of the circuit board. The pressure transducer generally comprises a semiconductor-based pressure sensor which is embedded in a parallelepipedal housing which consists of a plastic molding compound. Provided in the housing on the side facing away from the circuit board is a channel through which the medium (usually air) transferring the pressure to be measured can transfer the pressure onto the pressure sensor. Because of their small size, such pressure transducers generally respond very quickly to pressure changes--in many cases much more quickly than is desired. This requires an increased effort when analyzing the pressure sensor signal if the intention is to prevent rapid, short-term pressure fluctuations from causing unnecessary reactions of a monitoring device or even an unnecessary alarm. To counteract this, the output signal of the sensor can be subsequently damped electrically and/or electronically, or, if a specific signal analysis system is provided, the signal analysis algorithm can be configured such that low-pass filtration and thus damping of the response characteristics of the sensor are achieved. The conventional means therefor is the use of an RC section. Subsequent damping of the pressure sensor represents an error source, and requires an additional circuit outlay which goes against the trend toward simplification and miniaturization. A pressure sensor that is small but nevertheless does not respond so quickly would be desirable, but the trend toward miniaturization goes hand in hand with increasingly fast response characteristics.
It is the object of the present invention to indicate a way in which to arrive, without major effort, at small electronic pressure transducers whose output signal does not need subsequently to be electronically damped. The concrete starting point for this problem is the search for a suitable pressure transducer for monitoring the air pressure in vehicle tires. This requires a pressure transducer which on the one hand is so small that it can be housed together with a battery and an active electronic circuit in or on the valve base, but on the other hand is so slow-reacting that it does not respond to the unavoidable rapid pressure changes occurring while driving, but responds only to the slower pressure changes occurring as a result of leaks or tire damage, upon which the more rapid pressure changes are superimposed. Pressure fluctuations whose rate of change in pressure is greater than 500 mbar/s are of no interest in this context, and merely complicate analysis of the pressure sensor output signal.
According to the invention, an arrangement having the features indicated in claim 1 is proposed in order to achieve the stated object. Advantageous developments of the invention are the subject of the dependent claims.
The invention has the advantage that it allows the use of very small, fast-responding electronic pressure transducers, but requires no subsequent damping of their output signal. This is achieved in that the pressure transducer is mechanically damped with the simplest of means, by the fact that the channel through which the pressure to be measured is guided to the pressure sensor is shielded in suitable fashion on the outside of the housing, so that the flow resistance for the fluid en

REFERENCES:
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patent: 5557049 (1996-09-01), Ratner
patent: 5648615 (1997-07-01), Jeske et al.
patent: 5708411 (1998-01-01), Hill

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