SU901904A2 - Converter of rotation speed to pulse train - Google Patents

Description

The invention relates to techniques and can be used to control engine rotation parameters

In the main author. St. No. 75431 1 known is a speed to pulse converter * containing three diodes, the cathodes of which are connected to the outputs of the three phases of the generator via transistors, the bases of which are connected to adjacent phases through resistors, a transformer whose primary winding is connected at one end through a capacitor to the anodes by a diode, the second end through resistors with outputs of the phases of the generator, ₁₅ and the secondary winding is connected to the input of the amplifier-former [1].

The specified device provides measurement of only one parameter of the speed. _and

The purpose of the invention is the expansion of the functionality of the device by determining the direction of rotation.

This goal is achieved by the fact that three pulse shapers and two triggers are introduced into the device, while the shaper inputs are connected to the cathodes of the diodes, the outputs of the first and second shapers are connected to the inputs of the first trigger, the outputs of which are connected to the installation inputs of the second trigger, and the output of the third shaper is connected to counting input of the second trigger.

Figure 1 presents the structural diagram of the device; in FIG. 2 - timing diagrams.

The device contains a speed sensor 1 — a technical generator, the phase outputs of which are interconnected via resistors 2-4 forming a star. Transistors 5–7 are included in each of these phases and diodes 8–10 are connected in series with them, the anodes of which are combined into a common point. Transistor Phases 5 “7

E01904 Res resistors 11-13 are connected to the adjacent phase. The common point of the diode 8-10 through the resistor 14 is connected with the midpoint of the star formed by the resistors 2-4, and through the capacitor 15 - 5 with one of the terminals of the primary winding of the transformer 16, the other terminal of which is also connected to the star point. The secondary winding of the transformer 16 is connected to the amplifier-shaper 17. The cathodes of the diodes are connected to the shapers 18-20. The shapers 18 and 19 are connected to the inputs of the trigger 21, the outputs of which are connected to the trigger 22, also connected to the shaper 20.

The principle of operation of the device is as follows.

The three-phase sinusoidal voltage from the sensor 1 is supplied to tran- ₂₀ ican 5 "7, which operate in switching mode, whereby the signal is supplied to the cathodes of the diodes 8-10 only in the phase in which the transistor base is 7 5 ~ 25 under positive potential relative to the collector (figure 2). Diodes 8-10 provide three-phase rectification and at the same time exclude the passage of equalizing currents between the two phases, the resistor 14 provides a short circuit of the electric circuit with a constant voltage component. Resistors 2-4 create an artificial zero of three-phase voltage. Resistors 11-13 limit the base current of transistors. An informative signal is determined from the cathodes of diodes 8-10, is formed into a rectangular pulse by the shapers 18-20; When the rotor of the sensor rotates in the forward direction, a three-phase voltage with a direct sequence A, 8, C is generated at its output (Fig. 2). At the moment at the output of the former 19, an impulse is generated, which throws the trigger 21. The trigger 22 is also thrown, subject to the values of the resolving signal at the counting input. The specified enable signal is generated at the output of the driver 20 at time t ₃ . At time t., Trigger 21 is thrown due to the signal from shaper 18, but trigger 22 does not change state due to the lack of an enable signal at the counting input. Thus, the state of the trigger 22 is determined in a direct sequence of phases. When the direction of rotation of the rotor of the tachogenerator changes, the phase sequence changes, and at the outputs of the formers a <b, A, C sequence is formed. In this case, the sorting of the trigger 22 changes, since the permission for the counting input comes with a different state of the trigger 21.

Therefore, a certain phase rotation, and accordingly the direction of rotation, corresponds to a certain state of the output trigger.

Claims (1)

(St) ROTATION FREQUENCY CONVERTER IN THE PULSE SEQUENCE The invention relates to a technique and can be used to control the parameters of the rotation of engines. St. No. a known frequency converter of rotation is a pulse sequence containing three diodes whose cathodes are connected to the outputs of three phases of the generator through transistors, whose bases are connected to adjacent phases through resistors, a transformer whose primary winding is connected at one end through a capacitor to the anodes by a diode, the second end through resistors with generator phase outputs, and the secondary winding is connected to the input of amplifier former 1. The specified device provides measurement of only one rotational frequency parameter scheni The purpose of the invention is to expand the functionality of the device by determining the direction of rotation. The goal is achieved by the fact that three pulse shapers and two flip-flops are entered into the device, while the shaper inputs are connected to the cathodes of the diodes, the outputs of the first and second shaper are connected to the inputs of the first trigger, the outputs of which are connected to the installation inputs of the second trigger, and the output of the third shaper connected to the counting input of the second trigger. Figure 1 shows the structural diagram of the device; in fig. 2 - time diagrams. The device contains a rotational frequency sensor 1 — a technogenerator, the phase outputs of which are interconnected through resistors 2–4, which form a star. Transistors 5–7 are connected to each of these phases and diodes 8–10 are connected in series with them, the anodes of which are combined into a common point. The phases of the transistors 5-7 through the resistors 11-13 are connected with the adjacent phase. The common point of diode 8-10 is connected via resistor I to the midpoint of the star formed by resistors 2-1, and through capacitor 15 to one of the terminals of the primary winding of the transformer 16, the other pin of which is also connected to the star's point. The secondary winding of the transformer 16 is connected to a driver amplifier 17. The diode cathodes are connected to a 18-2D driver. The formers 18 and 19 are connected to the inputs of the trigger 21, the outputs of which are connected to the trigger 22, also connected to the driver 20. The principle of operation of the device is as follows. The three-phase sinusoidal voltage from sensor 1 is applied to transistors. which operate in a key mode, as a result of which the signal goes to the cathodes of diodes 8-10 only in the phase in which the base of the transistors is at a positive potential relative to the collector (Fig. 2). Diodes 8-10 provide a three-phase rectification and at the same time exclude the passage of equalizing currents between the two phases, the resistor I ensures the closure of the electrical circuit at a constant component voltage. Resistors 2-create an artificial zero three-phase voltage. Resistors 11-13 limit the base current of the transistor. The informative signal is determined by the cathodes of the diodes 8-10, is formed into a rectangular pulse by the formers 18-20; When the rotor rotates, the sensor in the forward direction at its output forms a three-phase voltage with a direct sequence A, 5, C (Fig. 2). 6, the instant tj at the output of the driver 19 produces a pulse, which flips the trigger 21. The trigger 22 is also thrown under the condition of the values of the enabling signal at the counting input. The specified enabling signal is formed at the output of the imaging unit 20 at the time tj. At the time q, the flip-flop 21 is transferred due to the signal from the imaging unit 18, but the flip-flop 22 does not change state due to the absence of the resolving signal at the counting input. Thus, the state of the trigger 22 is determined by direct phase sequence. When the direction of rotation of the rotor of the tachogenerator is changed, the phase alternations change, and an And, A, C sequence are formed at the outputs of the formers. In this case, the state of the trigger 22 changes, since the resolution to the counting input enters a different state of the trigger 21. Therefore, a certain phase rotation and, accordingly, the direction of rotation corresponds to a certain state of the output trigger. The invention The frequency converter in the pulse sequence according to the author. St. W 75ч311, differing from the fact that, in order to expand the functionality by determining the direction of rotation, three pulse shapers and two flip-flops are introduced into it, while the shaper inputs are connected to the diodes cathodes, the first and second shaper outputs are connected to the first trigger inputs The outputs of which are connected to the installation inputs of the second trigger, and the output of the third driver is connected to the counting input of the second trigger. Sources of information taken into account during the examination 1. USSR Author's Certificate No., cl. G 01 P 3 / “8, 1978 (prototype). 4-1