SU1509825A1 - Working hour counter - Google Patents

Abstract

The invention relates to a technique for automatically recording the operating time of electric devices of periodic operation and can be used to sum up the operating time of an engine or any other installation (machine assemblies, etc.). The purpose of the invention is to simplify the design of the meter and increase its reliability. The hour meter circuit includes a rectifier 1, a clock mechanism 2, including a winding electromagnet 3 with an output contact mechanism of automatic activation and a start-stop electromagnet 4, a capacitor 5, five resistors 6-10, respectively, an input 12 and an output 11 transistors. The hour meter does not allow the contact mechanism to automatically turn on the electromagnet 3 winding at the moment when the supply voltage is applied, when the capacitor 5 is not charged by the energy source to operate the clock mechanism 2, after which the input transistor 12 opens the output transistor 12, opens the output transistor 11, creates an electrical a circuit for discharging the capacitor 5 through open transistors 12 and 11 and the closed contact of the automatic turning on mechanism of the winding 3, as a result of which schestvl a regular-winding watch mechanism. 2. 1 Il.

Description

supply voltage when the capacitor 5 is not recharged by the power source for the operation of the clock mechanism 2, after which the input transistor 12 opens the output transistor 11, an electrical circuit is created to discharge the capacitor 5 through the open transistors 12 and 11 and the closed contact of the automatic switching mechanism of the electromagnet 3 windings, as a result of which the next winding of the clock mechanism 2 is carried out. 1 IL,

The invention relates to a technique for automatically recording the operating time of electric devices of periodic operation and can be used to sum up the operating time of an engine or other installation.

The aim of the invention is to increase reliability by simplifying the hour meter circuit.

 The drawing shows an electrical circuit of the hour meter.

The meter, the tachometer of hours, contains vt - mitel 1, clock mechanism 2, including an electromagnet 3 windings with an output contact mechanism of automatic switching on and an electromagnet 4 start-stop, capacitor 5, first, second, third, quarter-frequency and fifth resistors 6-10, respectively, output 11 and input 12 transistors.

On the clock mechanism 2, the common power supply terminal 13. is marked for the windings of the start-stop electromagnets and watch mechanism winding, the power supply electromagnet terminal 14 for the winding electromagnet, and the start-stop electromagnet power supply terminal 15.

According to the electrical circuit of the hour meter, the plus bus of the rectifier 1 is connected to the output of the first resistor 6. Another output of the first resistor 6 is simultaneously connected to the power terminal of the electromagnet .4 start-stop of the clock mechanism 2, to the emitter of the output transistor, to the output of the third resistor 8, to the positive the capacitor plate 5, to the output of the second resistor 7 and to the gate of the input transistor 12. The minus bus of the rectifier 1 is simultaneously connected to the negative plate of the capacitor 5, to the terminals of the second and fourth resistor 7 and 9 coo respectively, and to the common terminal 13 power windings of electromagnets start-residual iodine winding 3 and 4 hours mehaCh

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nizm. The drain of the input transistor 12 is simultaneously connected to the output of the third resistor 8 and to the base of the output transistor 11. The source of the input transistor 12 is simultaneously connected to the output of the fourth and fifth resistors 9 and 10, respectively. The collector of the Vcod transistor 11 is simultaneously connected to the output of the Fifth resistor 10 and the power supply terminal 14 of the electromagnet 3 of the winding movement of the clock mechanism 2. The hour meter circuit consists of an input transistor 12 connected in the source follower circuit and an output transistor 11 that provides a high factor current amplification and low output resistance.

The device works as follows.

AC voltage to the input terminals of the rectifier 1 is supplied from the secondary winding of a step-down transformer (not shown). The rectified voltage from the output buses (positive and negative) of the rectifier 1 is supplied to the supply circuits of the clock mechanism 2 and the capacitor 5. The winding of the start-stop electromagnet 4 is powered by the current of the top 1. At the time of applying the voltage, the capacitor 5 is discharged, input and output transistors 12 and 11, respectively, are closed. If, at the moment when the supply voltage is supplied from the busbar rectifier 1, the contact of the electrolytic winding 3 of the winding mechanism 2 is closed, the input transistor 12 and the output transistor 11 will open when the capacitor 5 is fully charged. As the voltage across the gate of the input transistor 12 increases, so will the voltage across the source. Almost all the voltage, the power will fall on the fourth resistor 9. The voltage at the source-to-drain portion of the input transistor 12 will decrease. The output transistor 11 is opened. An electrical circuit is created to discharge the capacitor 3 through the opened transistors 12 and 11 the fifth resistor 10 and the closed contact of the automatic switching mechanism of the electromagnet 3 of the winding of the clock mechanism 2, as a result of which the next winding of the clock mechanism 2 takes place. As the capacitor 5 is discharged through the second the resistor 7, the voltage drop across it, and thus the voltage across the gate of the input transistor 12, will decrease. The operating point of transistor 12 will return to its original position given by the fourth auto-bias resistor 9. On the resistor 9, approximately half of the supply voltage will fall, and the rest in the section between the drain and source of the transistor 12. The positive bias voltage at the base of the output transistor 11 will increase and it will close. If the contact of the automatic switching mechanism of the electromagnet 3 of the winding closes after the supply voltage is supplied from the rectifier bus 1, the winding is performed by the voltage supplied from the transistor 12 prepared for opening. The first resistor 6 and the capacitor 5 form a KS circuit and play the role of a filter that reduces the level of the ripple of the supply voltage on the electromagnet 4 start-stop. The third resistor 8 forms the required operating point position on the voltage across the collector of the output transistor 11. The necessary resistance of the electromagnet winding

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3 winding is provided by the fifth re-. by the Y transistor. The input transistor 12 is selected as a field effect transistor from the KP 303 series, and the output transistor 11 is a composite one from the KT 825 series.

Claims (1)

Invention Formula The hour meter contains a rectifier, a clock mechanism that includes a start-stop electromagnet and a winding electromagnet with an output contact mechanism for automatic switching on, a capacitor, five resistors and an output transistor, and the plus bus of the rectifier is connected to the first output of the first head, the second output of which connected to the power terminal of the electromagnet start-stop, to the emitter of the output transistor, to the first terminal of the third resistor and to the positive capacitor plate, the negative plate of which is connected to the common power terminal of the clock mechanism, and to the negative bus of the rectifier, characterized in that, in order to simplify the design and increase reliability, an input transistor is inserted into it, the gate of which is connected to the positive plate of the capacitor and to the first output of the second resistor, the second the output of which is connected to the minus plate of the capacitor and to the first output of the fourth resistor, the second output of which is connected to the first vyvrd fifth resistor and to the source of the input transistor, the drain of which is connected to the second in the output of the third resistor and to the base of the output transistor, the collector of which is connected to the second output of the fifth resistor, and to the power terminal of the winding electromagnet.