CS201707B1 - Connection for the control of the electric blocks function - Google Patents

Description

BACKGROUND OF THE INVENTION The invention relates to circuitry for monitoring the operation of electronic blocks with an indication of a fault condition.

Up to now, the function of the electronic blocks has been checked on the instruments by checking the magnitude of the voltage and current levels important for the function of the device by means of dividers converting the levels to a uniform size, a switch enabling selection of the measured level and the measuring instrument.

The disadvantage of such a control method is that continuous monitoring of the levels during operation of the devices is not guaranteed.

This disadvantage is overcome by the circuitry for monitoring the operation of the electronic fault indication blocks according to the invention.

Its essence is that the outputs of the divider system are routed to the inputs of the extremal circuit to select the minimum and maximum voltage or current levels. The outputs of the extremal circuit are connected to the inputs of the window comparator which has the output connected to the input of the indicator circuit.

The outputs of the divider system are also connected via the switch to the input of the measuring instrument. A fault condition is indicated immediately, and the operator using a meter connected sequentially through the divider switch detects which level of voltage or current is out of tolerance and will repair or replace the faulty function block.

An overall block diagram of the wiring is shown in Fig. 1 and a specific case wired according to the invention is shown in Fig. 2.

The outputs of the divider system 1 (FIG. 1) are routed via a switch 5 to a measuring device 6 and to an input of the extremal circuit 2. The outputs of the extremal circuit 2 are connected to the inputs of the comparator 3 which is connected to the indicating circuit 4.

Controlled levels of voltages or currents that characterize the operation of electronic circuits are applied to a set of 1-level dividers where they are converted to a uniform magnitude. These levels are routed to the input of the extremal circuit 2. The extreme circuit 2 selects the minimum and maximum voltages from a series of applied voltages. These two voltages are applied to the inputs of the comparator 3, the output of which is connected to an indicating circuit 4 with an optical or audible indication. The meter 6 is connected via a switch 5 to a set of level dividers 1 and allows selective control of voltages or currents.

Fig. 2 shows an example of a particular circuit. Controlled voltages with unified U up to _n are connected via series resistors Rj to R _n to a set of compensating diodes D _1a to D _n and a D _m to D _{n B.}

The cathodes of the comparing diodes Dia to D _nA are connected to a resistor B _A , the other end of which is grounded and via a resistor R _B based on a transistor Tj. The comparator diodes D _1B to D _nB are connected through a transistor T ₂ based on a resistor R _c .

The emitter of transistor Tj is connected both to the positive pole of the voltage source U _B and to the collector of transistor T _{: 1} via a resistor R _f .

The collector of transistor Tj is connected via a resistor R _D to the emitter of transistor T ₂ , the collector of which is grounded. The positive terminal of the voltage source U _A is connected to the emitter of transistor T ₂ . The negative pole of the voltage source U _A is grounded via a resistor Re and connected on the base of transistor T ₃ . The emitter of transistor T3 is grounded and the output of the whole circuit is connected to the collector of transistor « ₃ to which the indicator element I is connected.

The wiring function is as follows. The highest of the voltage series Uj to u _n opens the corresponding comparator diode Dj _a to D _nA and is applied via a transistor Tj via a resistor R _b . If this voltage is higher than the source voltage U _B , it is

Claims (1)

SUBJECT Circuit arrangement for controlling the operation of electronic blocks consisting of a plurality of dividers ceding level of uniform size, wherein the output of the divider are connected via a switch connected with the input of the measuring device, characterized in that the outputs of the systems of dividers (1), the transistor Tj is closed and is thus closed and the transistor T ₃ and the circuit indicates a fault. The lowest voltage of a series uj to u _n opens a series of comparative diode D _1B to D _nB and through a resistor R _C applied to the base of transistor T _second If this voltage is lower than the source voltage U _A , transistor T _{2 is} open and transistor T _{3 is} closed. The circuit indicates a fault. If the transistor-based voltage Tj is less than the source voltage U _A) , the transistor Tj is open if the transistor-based voltage T ₂ is greater than the source voltage U _A , the transistor T ₂ is closed and the transistor T ₃ is open. The circuit does not indicate a fault. By selecting the voltage of the sources U _A and U _B , the tolerance of the permissible values in which the controlled voltages can move can be selected. The circuit continuously indicates the deviation of the monitored voltage level from the tolerance field given by the voltage magnitude of the sources U _A and U _B. Using the switch 5 and the Meter 6, the operator finds the voltage out of tolerance and finds the fault circuit. OF THE INVENTION they are directed to the inputs of the extremal circuit (2) for selecting the minimum and maximum levels, the two outputs of which are connected to the inputs of a comparator (3) having an output connected to the input of the indicator circuit (4).