Key two-stroke generator (options)

 

(57) Abstract:

The invention relates to the field of radio and can be used in key power transmitting devices. The invention solves the problem of stabilization energy mode when the resistance of the load generator. Key generator designed in push pull circuit with parallel power supply. The generator includes generating apparatuses, the load circuit of the parallel type. Between the power devices and the load circuit includes two forming the contour of the l-shaped type, consisting of capacitors, inductors. The generator additionally introduced two limiting diode unipolar generator devices, the blocking inductor and decoupling capacitor. In the first embodiment, the anodes limiting diodes connected respectively to the connection points of the conclusions of the dividing capacitors and inductors forming contours, their cathodes connected through decoupling capacitor is connected to the common bus of the generator, and after locking the choke to the positive pole of the power source. In the second embodiment, the anodes limiting diodes connected respectively to the points rez decoupling capacitor is connected to the common bus of the generator, and after locking the choke to the positive pole of the power source. 2 C. p. F.-ly, 3 ill.

Will invent relates to the field of radio engineering and can be used in key power transmitting devices.

Known key generator forming circuit described and investigated in detail in the scientific literature (Artem A. D. Amplifiers class D and key generators in radio communications and broadcasting. M: Communications, 1980, S. 92 - 105). This generator contains a key generating device (electron tube, transistor), a load circuit and a shaping circuit. Additional shaping circuit configured to frequency significantly different from the generated frequency, allows to obtain optimum performance key generator, characterized by the absence of spikes and voltage generator device in the moments of its unlocking and locking. This significantly reduces switching loss in the generator that provides a significant (not less than an order of magnitude) to effectively increase the frequency of the generated oscillations.

Also known push-pull key generator forming circuits (Kozyrev Century B., Lavrushenko C. G., Leonov the ligature, 1985, S. 130, Fig. 5.4). Essentially this generator is a combination of two single-cycle generators. The principle of operation and characteristics of this generator is practically no different from single-ended, however, in contrast to the composition of the oscillations generated two-stroke generator, does not contain even harmonics. This generator is accepted to be the closest analogue. It contains generating apparatuses UT1and UT2, which can be used in electron tubes or transistors forming the contours of the l-shaped type1L1C2L2the load circuit.

The drawback of these generators is a significant dependence of their energy regime, i.e. power, maximum voltage generating device and the reactive load elements and forming the contours of the resistance of the load generators. In some cases the use of such generators, such as power amplifier transmitting device, the load may vary within considerable limits. These changes may be slow, static (with the setting of the output circuits and antennas) and dynamic (during transmission when Azania on the elements of the generators and extratone cause the need to provide significant reserves in the dielectric strength of elements of the generators, that leads to an unjustified increase of the dimensions of the generators and reduce the reliability of their work, especially in high-power radio transmitters.

The invention solves the problem of stabilization energy of the mode, key generator forming circuits when the resistance of the load generator.

The device has two options technical solution.

The device according to the first embodiment solves the problem of stabilization energy generator mode by limiting the maximum voltage generating devices.

The device according to the second option solves the problem of stabilization energy generator mode by limiting the amplitude of the voltage on the load circuit.

The solution in the first embodiment is carried out by introducing in the key push-pull oscillator with shaping the contours of the two diodes, the locking of the throttle and a coupling capacitor. Thus the diodes included with unipolar power devices, their anodes connected to the connection points of the capacitors and inductors forming contours, their cathodes are connected and through the introduction of decoupling capacitor is connected to a common tx2">

Without input, the maximum value of the voltage generating devices even in normal mode (when the optimum load) is approximately three times the voltage of the anode power generator. When the resistance of the load generator maximum value of the voltage generating devices may greatly exceed the value of this voltage in the nominal mode. Put the elements included in the circuit of the generator in a certain way, allow to stabilize the maximum voltage at the generator level instrumentation is the doubled value of the anode voltage supply.

The solution of the task according to the second variant also carried out by introducing in the key push-pull oscillator with shaping the contours of the two diodes, the locking throttle and separating the capacitor. Thus the diodes included with unipolar power devices, their anodes connected to the connection points of the findings of the choke forming contours with the conclusions of the load circuit, the cathodes of the joint and through the introduction of decoupling capacitor is connected to the common bus of the generator, through the introduction of a locking orifice connected to the positive the operator allows to stabilize the amplitude of the voltage on the load circuit (on one shoulder the load circuit) the voltage level of the anode of the power generator.

If necessary it is possible to combine both solutions in one device, that allows the full stabilization energy generator mode.

Thus, implementation of the proposed technical solution enables more efficient use of generating apparatuses voltage, as even in normal mode the maximum voltage generating devices is reduced by 1.5 times, which allows a 1.5-fold increase in the anode voltage of the power generator, and means in the same time to increase the capacity of the generator. In addition, it becomes possible to considerably reduce the weight and size of the generator, especially a high power, due to the fact that there is no need to provide significant reserves in the dielectric strength of elements of the generator.

In Fig. 1 and Fig. 2 shows respectively the first and second structural variants of electric circuit of the proposed device. In Fig. 3 gives a block diagram of the combination of both options in a single device.

Key generator is made by a known push-pull circuit with parallel power supply. As generating devices 1, 2 can be used is 7, the outcome of the subsequent circuits of the generator from the DC voltage is dividing capacitors 18 and 19 and the inductor 20 connected between the middle point of the inductor 7 and the common bus of the generator 14. As the load circuit is a parallel resonant circuit consisting of inductor 7 and the capacitor 8 and the load resistor 9. Between the power devices and the load circuit includes two forming the contour of the l-shaped type, one of which consists of a capacitor 3 and the inductor 5, and the other of the capacitor 4 and the inductor 6 (Fig. 1 and 2).

The generator additionally introduced two diodes 10 and 11, included with unipolar generator devices 1, 2, locking the throttle 12 and the separating capacitor 13.

In the first embodiment, the input elements are included as follows. Anodes limiting diodes 11 and 10 are connected respectively to the connection points of the capacitors 3, 4 with the findings of the inductors 5, 6 forming contours. The cathodes of the diodes 10, 11 are connected and through the introduction of decoupling capacitor 13 is connected to the shared bus 14 of the generator, and entered through the locking orifice 12 to the positive terminal 15 of the power source.

In the second variant, with the help of the findings of the inductors 5, 6 conclusions the load circuit. The cathodes of the diodes 10 and 11 are connected, and through the introduction of decoupling capacitor 13 is connected to the shared bus 14 of the generator, and entered through the locking orifice 12 to the positive terminal 15 of the power source.

Key generator (option 1) works as follows.

Under the sequential unlocking generating devices 1, 2 pass through them current pulses, the shape and size of which, as is well known, depend on the parameters as a load, and forming contours. In the intervals between the current pulses to the generator devices is applied an alternating voltage is also substantially dependent on the parameters of these circuits. Usually this voltage represents segments of voltage close to sinusoidal. The average value of the voltage generating devices, obviously, is equal to the voltage E of the power source of the generator 15 regardless of the form of the voltage on the devices. Therefore, the maximum value of this voltage depends on its form, and may significantly exceed 2E. Voltage generating devices 1, 2 are passed through the dividing capacitors 18 and 19 at the connection point of the diodes 10, 11 (Fig. 1). The shape of these stresses on E. Therefore, if the maximum voltage value at the connection points of the diodes 10, 11 is greater than E, the diode opens, supporting these voltage level of E. Hence, the form of this tension came closer to meander, the same form will have and the voltage generating devices at the maximum value of this voltage is no more than 2E.

Key generator (option II) is as follows. On a parallel load circuit (7, 8, 9) at a sufficiently high q-factor, which is the calculation of the parameters of the circuit, the voltage has a sinusoidal shape. At the connection points of the diodes 10, 11 with respect to the common bus 14 of the generator (Fig. 2) there are also sinusoidal, but opposite phase voltage, the amplitude of which is equal to half the amplitude of the voltage on the load circuit. With increasing resistance of the resistor 9 load increases the amplitude of these voltages and power generator. If the amplitude of the voltages at the connection points of the diodes 10, 11 becomes greater than E, the diode opens, maintaining the amplitude of these voltages on the level of E and, hence, the amplitude of the total voltage on the load circuit at the level 2E regardless of further uvelichivaetsya recovery of excess reactive energy of the elements forming the contour, and the second of the elements of the load circuit in the power supply of the generator. This leads to the limitation of the maximum values of the voltages at the generator level instrumentation 2E and amplitude of the voltage on each half of the load circuit at the level of E regardless of the load resistance of the generator. The hard limit of the specified voltage provides stabilization power key generator when the resistance of its load within wide limits.

1. Key two-stroke generator, which is made by a two-step scheme with parallel power generator devices via the locking chokes and subsequent isolation of circuits from DC voltage dividing capacitors containing generating apparatuses, the load circuit of the parallel type and two forming the contour of the l-shaped type, which are included between the power devices and the load circuit, and an inductor connected between the inductor of the load circuit and the common bus, generator, characterized in that the introduction of two limiting diode, blocking inductor and decoupling capacitor, and clamp diodes with their anodes connected to the connection points of the conclusions of all of the diodes are connected through decoupling capacitor is connected to the common bus of the generator, and through the locking orifice connected to the positive pole of the power source.

2. Key two-stroke generator, which is made by a two-step scheme with parallel power generator devices via the locking chokes and subsequent isolation of circuits from DC voltage dividing capacitors containing generating apparatuses, the load circuit of the parallel type and two forming the contour of the l-shaped type, which are included between the power devices and the load circuit, and an inductor connected between the inductor of the load circuit and the common bus, generator, characterized in that the introduction of two limiting diode, blocking inductor and decoupling capacitor, and clamp diodes with their anodes connected to the connection points of the findings of the choke forming respective paths with the conclusions of the load circuit, the cathodes clamping diodes are connected through decoupling capacitor is connected to the common bus of the generator and through the locking orifice connected to the positive pole of the power source.

 

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The invention relates to the field of generating high-frequency damped oscillations and can be used in welding technique

FIELD: radio engineering, communication.

SUBSTANCE: method of controlling attenuation in an oscillatory LC circuit is based on connecting an additional resistor ρ<<r to the circuit between the earth and an inductance coil, where r is the active resistance of the coil, and introducing special initial conditions for generation of controlled oscillations. External emf is introduced into the circuit, the value of which is equal to the voltage across the resistor amplified k times without inversion and periodisation of the launch modes and the initial position. The required nature of attenuation is established and observed by controlling the equivalent resistance of the circuit r*=r-ρ(k-1); if r*>0 the process is attenuating, if r*=0 the process is not attenuating and if r*<0 the process is rising.

EFFECT: establishing the required nature of attenuation in controlled oscillations.

2 cl, 1 dwg

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