DK150867B - DEVICE FOR AUTOMATIC MONITORING OF THE CHARGING CONDITION OF A NET POWER SUPPLY AND OF THE HUMIDITY OF THE RESPONSE IN A POSITIONING DETERMINATION OF TRAFFIC DEVICES - Google Patents

Description

in 150867

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a device for automatically monitoring the state of charge of the network-independent power supply of the answering machine in a positioning device for traffic devices, which answering device is in radio contact with a questioning device installed in the traffic device and wherein the mains supply includes primary batteries or accumulators. solar cells are associated with a monitoring sensor with a response threshold for delivering an alarm signal which is 10 a defined adjustable value above the minimum voltage required for undisturbed operation, the result of which the measurement of the voltage as a monitoring signal made by each of the interrogator processes is applied. Such an arrangement is described in DE B1 23 16 781.

The functional security of such a point-shaped location system, in which data from the answering machine is transmitted to the reader by means of modulated microwave signals, of course, in addition to the network-independent power supply, also depends on a safe function of the microwave coupling in these appliances. This can, e.g. in case of cabinet damage, is strongly affected by humidity coatings. Thereby, immediate outages may occur, but there may also occur outputs which extend slowly and at which metallic coupling parts change their electrical data only upon corrosion. This can affect the reliability of the system over a long period of time. The detrimental effect of the humidity can only be ascertained here by the failure of the operation of the defective apparatus.

The invention therefore aims to improve a device of the kind referred to in the preamble, so that the humidity of the apparatus is also monitored.

35 According to the invention, this task is solved in that the power supply monitoring is supplemented with a humidity monitor in such a way that in the interior of the answering machine, which is kept in low operating humidity in normal operating condition, near the microwave coupling to be monitored, there is a probe indicating an excess of a predetermined limit value of the humidity and whose alarm signal is mixed with the monitoring signal for the feed voltage over an OR gate and entered into the blackout.

Advantageous embodiments and further developments of the invention are set forth in the dependent claims.

The invention is explained in greater detail below on the basis of an exemplary embodiment shown in the drawing.

FIG. 1 shows the complete monitoring coupling in the answering machine. In parallel with the battery with terminals + U „and 0, a first transistor TSI is disconnected

ISLAND

The 15 npn type has a voltage divider with resistors R2 and R3 in the base circuit, a series diode Z in series with one resistor R2, and with one resistor R1 in the collector circuit. From the collector of transistor TS1, a line Li leads to one input of a OR gate G, the output of which is connected to a telegram register TR. Over this line LI, a monitoring signal reaches the telegram register TR. The dimensioning of this monitoring coupling serving the battery is selected such that the transistor 25 TSI blocks upon obtaining a certain voltage value (alarm voltage).

In order to monitor the humidity, the coupling is supplemented as follows. Parallel to the emitter collector stretch of the first transistor TS1, a second transistor TS2 (pnp type) is coupled to a voltage divider with resistors R5 and R6 in the base circuit, a humidity-dependent resistor R7 in series with one resistor R6. resistor R4 in the collector circuit. The collector of transistor TS2 is connected to the second input of the OR port G.

A switch Su is connected to the current path of the battery voltage, which is activated by a monitoring pulse I and only briefly (<$! O / oo) within the telegram circuit switches on the monitoring coupling.

The position of the switch shown applies in the case that both monitoring couplings, namely that of the battery voltage and that of the humidity, are inactive. The monitoring connections with the transistors TSI and TS2 are then without operating voltage. At the gate inputs there is a logical "O" (OV) over the line L1 and the resistor R1 as well as over the line L2 and the resistor R4. With the monitoring pulse 1 ^ the coupler Su 10 applies a short-term operating voltage to the monitoring couplings. If the voltage ϋβ is lowered below a predetermined threshold so that the zener diode Z no longer becomes conductive during the course of the monitoring pulse I ", a logic" 1 "(+ UD) is located on the gate input over the line 15 Li and the resistor R1. If the voltage value of + υβ still exceeds the predetermined threshold value, the zener diode Z and thus also the transistor TSI becomes conductive during the course of the monitoring pulse I '. Hereby the line LI is connected across the transistor TSI- to OV and no alarm occurs during the monitoring pulse 1 ^.

The resistance value of the humidity-dependent resistor R7 depends very strongly, as far as possible on a logarithmic course, on the humidity, namely in such a way that the resistance value becomes less with increasing humidity. A decrease in resistor R7 causes the transistor TS2 to become conductive and over the line L2 send a signal in the form of a logic "1" to the OR gate G. In order to save 30 operating current, the transistor TS2, like the transistor TSI, is only connected to the operating voltage. + OUT using switch Su during monitoring pulse I-. The internal compartment of the microwave oven contains, at delivery or after maintenance work, air with the lowest possible humidity.

Of course, the humidity monitoring described above is not limited to use in an answering machine in a location system, but

Claims (5)

15 PATENT REQUIREMENTS An apparatus for automatically monitoring the charge state of the network-independent power supply of the answering machine in a positioning device for traffic devices, said answering device being in radio contact 20 with a questioning device installed in the traffic device, and wherein the primary supply comprising primary batteries or accumulators with solar cells is connected a monitoring sensor having a response threshold for delivering an alarm signal which is a defined value adjustable above the minimum voltage required for undisturbed operation, the result of which the measurement of the voltage as monitored signal is applied to each of the interrogation signals by a telegram register; the power supply monitoring is supplemented with a humidity monitor in such a way that a probe is located in the interior compartment of the answering machine, which in normal operation mode is kept at low humidity, near the microwave coupling to be monitored. e (R7), which indicates an excess of a predetermined humidity limit value and whose alarm signal is mixed with the supply voltage monitoring signal over an OR gate (G) and entered into the blackout. Device according to claim 1, characterized in that the probe (R7) comprises an ohmic resistance 5 whose resistance value depends very strongly on the humidity, preferably with a logarithmic course. Device according to claim 2, characterized in that the change of resistance over a transistor coupling (TS2) is converted to binary values applied to the OR gate (G). Device according to one or more of claims 1 to 3, characterized in that the monitoring couplings are only switched on for a short time (+1%) within the telegram process. Device according to claim 4, characterized in that in the supply voltage of the battery voltage (+ ϋβ) there is a switch (Su-) activated by a monitoring pulse - (I-).