SU374741A1 - TEAM DEVICE FOR INSTRUMENTS DIMENSIONAL MONITORING SOUTH 'rD' ^ GKGUL - ^ i - ^? -: .- .-. .. .. / •! ^ - ^ - • si ^ .SliiU ^^? •, y ^ C: ^ J ;; J; • ;; 0 - Google Patents

Description

The invention relates to automation and can be used to convert an analog signal corresponding to a controlled movement into the contact closure of an electromagnetic relay, switching various electrical circuits of actuators of measuring instruments and control and sorting machines. A command device for dimensional control devices is known that contains a first inverting stage, a transistor cascade, whose input is connected via a resistor and a zener diode to a control signal source, and the output via a resistor is connected to the input of a second inverting cascade transistor, in the collector circuit of which the actuator winding is connected relay, emitter circuit connected to the power source through the contacts of the reset button, and the reference voltage sources on the diodes included in the emitter circuit ranzistorov both stages. The purpose of the invention is to increase the speed when operating in a mode with memorizing a control signal, as well as to be able to operate in a mode without memorizing a control signal. For this, a diode is additionally connected between the collector of the transistor of the second inverting stage and the base of the transistor of the first inverting stage. An additional source of bias voltage is connected to the base of the transistor of the second inverting stage. FIG. 1 shows the basic electrical circuit of the device proposed; in fig. 2 is a diagram of the possible use of the proposed device. The command device contains two inverting stages made on transistors / and 2. The base of transistor 1 is connected to terminal 3 of the control signal via resistor 4 and zener diode 5. Transistor collector / is connected via resistor 6 to base of transistor 2. Resistor 7 serves as a collector load of transistor J and the collector load of transistor 2 is the relay coil 8. Diodes 9-12 are included in the emitter circuit of the transistors, which are sources of reference voltages. The emitter circuit of transistor 2 is connected to a power source through the contacts 13 of the reset button. The collector of transistor 2 is connected to the base of transistor 1 through diode 14. An additional voltage source 1 is connected to terminal 15 and switched by contacts 16-18 of the additional switch. In the absence of a control signal, a negative potential is applied to the circuit input. The current flowing through the resistor 19 creates on the base a potential sufficient to unlock the transistor /.

The magnitude of the positive bias and the resistors 6 and 19 are selected so that in the open state the transistor / transistor 2 is locked, and in the locked state of transistor 1, the transistor 2 is saturated.

When the transistor is locked 2 relays 8, the diode 14 is biased in the opposite direction. When the negative potential is removed from the input, the transistor / is locked by a positive bias, which is determined by the voltage drop across the diodes 9 and 10 connected in the forward direction. Transistor 2 opens, the potential of its collector becomes close to zero. Diode 14 turns out to be locked inappropriately.

If we now apply a negative potential to the input, then the resistor, / 9 will turn out to be a clamped diode 14 connected in the forward direction, so no matter how the current through the resistor 4 changes, the potential at the base of transistor 1 cannot be greater than the voltage drop across the diode 14 while the potential of the emitter of the transistor / is determined by the voltage drop across the diodes 9 and 10.

The time required to close the transistor Y and peel the transistor 2 is not significant, therefore the duration of the control pulse must be slightly longer than the switching time of the transistors / and 2 and be several microseconds.

The adjustment mode of operation (without memory) is carried out using the contacts 16-18 of the switch. When it is turned on, the emitter of transistor 2 is connected to the positive power supply terminal via diodes 11 and 12, and resistor 20 is disconnected from the positive bias source and connected to the power supply bus. When a negative I1 pulse is applied to the input of the circuit, a signal exceeds the potential of the emitter, which will lead to unlocking of the transistor 1 and turning off the relay 8.

Subject invention

Claims (2)

1. A command device for dimensional control devices containing the first inverting cascade on the transistor, whose input is connected via a resistor and zener diode to a control signal source, and the output via a resistor is connected to the input of the second inverting cascade on a transistor, the collector winding is connected to the collector circuit relay, and the emitter circuit is connected to the power source through the contacts of the reset button, and the reference voltage sources on the diodes included in the transit emitter circuits tori both stages, characterized in that, with a view to the Enhance operating speed, between the collector of the transistor of the second inverting stage and the inverting base transistor of the first stage is further connected diode. 2. The device according to claim 1, characterized in that, in order to ensure its operation in a non-memorized control signal, an additional source of bias voltage is connected to the base of the transistor of the second inverting cascade through the contacts of the additionally inserted switch. - Fig 2