Shaper sequences of phase-modulated pulses for excitation of the resonant load

 

(57) Abstract:

Usage: pulse equipment transmitting paths large and medium power. The inventive shaper sequences of phase-modulated pulses for excitation of the resonant load contains shaper 1 pulse, two-rail pulse-width modulator 2, the distribution pulses of 3.9, dual key amplifier 4, phasers 5,6, logical adders 7,8, logical switch 10 and the phase-shifting circuit 11, the operation algorithm which allows to reduce nonlinear distortion in the expansion of the dynamic range of the output signals. 3 Il.

The invention relates to a pulse technique and is intended for use in transmission paths of large and medium power.

Known methods of excitation in resonant load amplitude-modulated high-frequency (HF) oscillations of low frequency (LF) envelope which is secreted in the medium of propagation of the oscillations due to its nonlinear properties. As shapers of such signals can be used the known device containing a pulse shaper, key amplitude regulator and key gene is eduit be attributed to low energy efficiency, due to the presence of two consecutive links of the key conversion, increased distortion and limited dynamic range of the output signal. In addition, it should be noted the low efficiency of the allocation process LF components in the environment of propagation of the RF signal, modulated in amplitude.

This disadvantage is eliminated in the device that most closely to offer. It implements a method of forming on the load signal beating U, which is represented by the sum of the two RF oscillations with frequencies1and2symmetrically shifted relative to the center frequencyaboutthe value determined by the frequency of the LF signal: U = [cos(o+ )t+cos(o- )t]= m cos t cosot where m is the amplitude of the LF signal envelope beating.

The device includes a rectifier and zero-body, the inputs of which are connected with the bus of the LF signal, and the pulse shaper, the pulse-width modulator, the pulse distributor, dual key the amplifier and phase shifter.

The principle of the device is based on the transformation of the LF signal U = mcos t in bipolar pulse sequence V4with a repetition rate of oand phase manipulate on pererodlene HF-harmonics of such a pulse voltage with a frequency > 2oallows you to highlight on the load signal beats with the envelope defined by the LF signal.

The main disadvantage of such devices is the increased level of nonlinear distortion signal envelope beating, especially at low levels, a low frequency signal, which limits the dynamic range of the signal changes beating. This circumstance is explained by the presence of the rectifier circuit converting a low frequency signal, as well as the need for amplification of short pulses at low values.

The aim of the invention is to reduce distortion when extending the dynamic range of the output signal.

This is achieved in a device containing a pulse shaper with two outputs, the output signal of a reference frequency which soedin with the first input of the pulse-width modulator, the first phase shifter, the first pulse distributor and dual key amplifier whose outputs are the outputs for connection of the resonant load, the included series-connected logical switch of the second pulse distributor, the first logical adder and the second phase shifter and the second logical adder and a phase-shifting circuit the first and second outputs of which are connected to corresponding inputs of a logical switch, the first and second outputs of which are connected with the first inputs of the first and second distributors pulses. The output signal of twice the reference frequency of the pulse shaper with two outputs connected to the first input of the phase-shifting circuit and the other inputs of the first and second distributors pulses. The output of the phase-shifting circuit connected to the first input of the first phase shifter and the other input of the second phase shifter, and the first and second outputs of the first distributor pulses respectively to the first input of the second and the other input of the first logical adders. The output of the second logical adder connected to the second input of the first phase shifter and the other input to another output of the second pulse distributor. Dual key amplifier with its inputs connected to respective outputs of the first and second phase, while the second input of the phase-shifting circuit connected to the output signal of the reference frequency of the pulse shaper and the second paraphase input pulse-width modulator is the input LF signal of the proposed device.

This new collection of blocks and connections allows you to provide immediate (without straightening) converting a low frequency signal is of two almost opposite phase sequence of pulses of the type meander, what could be obsecene almost without significant distortion.

In Fig. 1 presents a functional diagram of the proposed device with examples of possible implementations of functional blocks of Fig.2 and 3 shows time diagrams of voltages explaining the operation of the prototype and the proposed device.

The proposed device contains shaper 1 pulse, two-rail pulse-width modulator 2, basedialog circuit 11, the logical switch 10, the valves 3 and 9 pulses, logical adders 7 and 8, the phasers 5 and 6 and dual key amplifier 4.

The proposed device operates as follows.

The imaging unit 1 generates pulses at the first input PWM 2 pulse signal Central frequency foconverted integrator 2.3 in two mutually opposite phase of the sawtooth voltage UP1UP2coming to inverted inputs of Comparators 2.1, 2.2.

For admission to direct inputs of Comparators 2.1, 2.2 LF signal from the outputs of the Comparators are formed of a sequence of pulses V2.1V2.2with single-cycle pulse-width modulation. Further, these impulsnaya of which corresponds to a given polarity of the LF signal. The resulting pulse signals V10.1V10.2through the valves 3, 9 pulses are received at the inputs of the respective logic adders 7, 8. When the valves 3, 9 carry out the separation of the pulses V10.1V10.2to clock time, the given signal to twice the center frequency 2fo. The adder 7 implements the Association of pulse signals V3.1(the respective first portions of the pulses V10.1and V9.2(the respective second portions of the pulses V10.2). The adder 8 combines the pulse signals V3.2(the corresponding second parts of the pulses V10.1and V9.1(corresponding to the first portions of the pulses V10.2).

The output signals V7and V8adders 7 and 8 are received at the first inputs of the phase 5 and 6, the second input of which the signal V11the center frequency fo of the output of the phase-shifting circuit 11. The front and the falling edge of the V11coincides with the front or decline of output pulses of the adders 7 and 8. This provides a time shift of the output signals of phase relative to the signal V11the pulse duration of the V6and V5. And for U > 0 is the delay of the SP relative to the signal . For the negative half is provided by the signal delay V5and ahead signal V6. In the relative time shift between the signals V5V6is determined by the pulse duration of the V9.1and V9.2(respectively for U >0 and U < 0), the value of which is proportional to the level of the LF signal.

When you gain power pulse sequences V5V6outputs dual key amplifier is formed bipolar pulse voltage V4corresponding to the selection at the resonant load signal beating U. In particular, at low levels of the LF signal U pulse sequence V5V6almost opposite phase, which corresponds to the formation of the output channel key amplifier pulses of short duration. The key channels of amplification to provide amplification of the power pulse sequences type meander as well as at high levels of the LF signal.

SHAPER SEQUENCES of PHASE-MODULATED PULSES FOR excitation of the RESONANT LOAD, containing the pulse shaper with two outputs, the output signal of a reference frequency which is connected with the PE the real key the amplifier, the outputs of which are the outputs for connection of the resonant load, characterized in that, in order to reduce nonlinear distortion in the expansion of the dynamic range of the output signals, it introduced sequentially connected logical switch, the second pulse distributor, the first logical adder and the second phase shifter, the second logical adder, and the phase-shifting circuit, a pulse-width modulator made in the form of a two-rail pulse-width modulator, the first and second outputs of which are connected to corresponding inputs of a logical switch, the second output of which is connected to the first input of the first pulse distributor, when this output signal is twice the reference frequency of the pulse shaper with two outputs connected to the first input of the phase-shifting circuit and the other inputs of the first and second distributors pulses, the output of the phase-shifting circuit connected to the first input of the first phase shifter and the other input of the second phase shifter, the first and second outputs of the first pulse distributor are connected respectively to the first input of the second logical adder and the other input of the first logical adder, the output of the second logical adder U the output of the second pulse distributor, the outputs of the first and second phase connected to respective inputs of the dual-key amplifier, the second input of the phase-shifting circuit connected to the output signal of a reference frequency pulse shaper with two outputs, and the second paraphase input pulse-width modulator is the input low-frequency signal shaper sequences of phase-modulated pulses for excitation of the resonant load.

 

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