DE10157202A1 - Acoustic response monitor for relay, has power provided from solar energy and response measurement is conducted without direct electrical connection to monitored relay circuit - Google Patents

Abstract

The monitor converts the relay switching pulse to an electrical signal using a sensor and passes it to evaluation electronics, which pass it via a filter, integration stage, Schmitt trigger and mono flop with externally regulated mono flop time to a generator with a connected signal sender. The monitor's power is provided from solar energy and the response measurement is conducted without direct electrical connection to the monitored relay circuit.

Description

problem

If the response of a relay is to be monitored in a circuit equipped with a relay without applying a measuring arrangement to the circuit, this can be done in three ways:
Firstly by observation, but this presupposes that the relay in question has a transparent housing. Secondly, according to Höröhr, but this can result in confusion with possibly neighboring relays. Thirdly, by means of a sense of touch, by sensing the suit or waste vibrations via the relay housing, but this is not always reliable and is not free from dangers.

solution

With the present invention, the electroacoustic response control for relays, the pickup or drop vibration of a relay can be reliably monitored by means of a signal tone, without having to intervene directly in the circuit to be observed. The device consists of a small, portable housing with sound opening for the buzzer (S) and potentiometers (P) for sensitivity and duration ( Fig. 1), which contains the evaluation circuit and the signal generator and a sensor connected to it via a line (M ) ( Fig. 2), consisting of condenser microphone 1 , insulating material 2 , housing 3 and shielded supply line 3 , which is applied to the relevant relay housing. The voltage supply for the evaluation circuit and signal generator can take place due to the low power consumption by means of a battery, which is recharged via solar cells (SZ).

The circuit works according to the following principle: The switching noise of the relay to be observed is supplied by a condenser microphone, which is housed in a housing insulated against external noise ( Fig. 2), via the shielded measuring line to the input stage of the evaluation circuit ( Fig. 3). This input stage consists of a double-T filter (A), whose resonance is tuned to the relay-typical noise frequency. This suppresses any external disturbing vibrations and noises. From there, the input signal passes via P1, which regulates the sensitivity, to the integrator stage (B), which converts the incoming AC low-frequency signal into a positive pulse wave. In the subsequent Schmitt trigger (C) the pulse is then formed into a square wave signal. So that the signal, which consists of one or two short square-wave signals, can deliver a sufficiently long acoustic signal tone, it is led to the generator (E) via a monoflop (D) adjustable by P2. This then delivers a signal to the buzzer (S) for the duration of the monoflop time, which makes the signal audible.

Other areas of application of the device can also be the similar monitoring of electromechanical switching mechanisms or other electromechanical devices his. name list FIG. 1Display of the device FIG. 2Display of the sensor FIG. 3Display of the circuit

Claims (1)

The acoustic response control for relays, which uses a sensor, which converts the acoustic switching noise as a microphone, or the switching pulse as a coil, into an electrical signal and sends it via a line to the evaluation electronics, where it uses a filter, an integration stage, and a Schmitt trigger and a monoflop, for pulse extension, arrives at a generator with a connected signal generator, while the own voltage supply is also possible via solar cells and the sensitivity and monoflop time can be controlled externally, is characterized in that you measure the response without a direct electrical connection to the monitored one Relay switching allowed.