SU873384A1

SU873384A1 - Amplification device

Info

Publication number: SU873384A1
Application number: SU802884166A
Authority: SU
Inventors: Владимир Александрович Гусев; Виктор Иванович Проскурня; Александр Борисович Шермеревич; Игорь Георгиевич Булычев; Виталий Алексеевич Литвиненко
Original assignee: Севастопольский Приборостроительный Институт
Priority date: 1980-02-18
Filing date: 1980-02-18
Publication date: 1981-10-15

Description

Изобретение относится к радиотех нике и может использоваться в выходных каскадах усилителей мощности низкой частоты. Известно устройство усиления,со- ^эдержащее усилитель мощности с нагрузкой, источник питания, подключенный к усилителю мощности через импульсный регулятор напряжения, между вы- .θ ходами и управляющим входом которого включен элементу сравнения [1 ].The invention relates to radio engineering and can be used in the output stages of low frequency power amplifiers. A device gain co- ^e holding power amplifier to the load, a power source connected to the power amplifier through the switching voltage regulator between outputs .θ passages and a control input which is enabled comparison element [1].

Однако известное устройство имеет ограниченный диапазон, внутри которого сохраняется высокий КПД и низкий уровень нелинейных искажений и помех. 15However, the known device has a limited range, within which a high efficiency and a low level of non-linear distortion and interference are maintained. fifteen

Цель изобретения - расширение частотного диапазона.The purpose of the invention is the expansion of the frequency range.

Для этого в устройстве усиления, содержащем усилитель мощности с-на- 20 грузкой, источник питания,подключенный к усилителю мощности через импульсный регулятор напряжения, между выходом и управляющим входом которого включен элемент сравнения, между г⁵ выходом усилителя мощности и другим входом элемента сравнения включены последовательно фильтр верхних частот детектор, сглаживающий фильтр и сумматор, а между выходом усилителя мощ- 30 ности и другим входом сумматора включен фильтр нижних частот.For this, in an amplification device containing a power amplifier with a load of 20, a power source connected to the power amplifier through a pulse voltage regulator, between which the output and the control input includes a comparison element, between r ^{5 the} output of the power amplifier and another input of the comparison element a high-pass filter is sequentially a detector, a smoothing filter and an adder, and a low-pass filter is connected between the output of the power amplifier and the other input of the adder.

На чертеже приведена структурная электрическая схема предложенного устройства.The drawing shows a structural electrical diagram of the proposed device.

Устройство усиления содержит усилитель 1 мощности с нагрузкой 2, источник 3 питания, элемент 4 сравнения, импульсный регулятор 5 напряжения, фильтр верхних частот (ФВЧ) 6, фильтр нижних частот (ФНЧ) 7, детектор 8,- сглаживающий фильтр 9, сумматор 10.The amplification device contains a power amplifier 1 with load 2, a power supply 3, a comparison element 4, a pulse voltage regulator 5, a high-pass filter (HPF) 6, a low-pass filter (LPF) 7, detector 8, a smoothing filter 9, adder 10.

Устройство работает следующим образом.The device operates as follows.

Когда частота усиливаемого сигнала ниже частоты среза ФВЧ 6 и ФНЧ 7 (частоты среза этих фильтров выбираются одинаковыми), на выходе сумматора 10 имеется напряжение, повторяющее по форме выходной сигнал, элемент 4 сравнения сравнивает напряжение питания и этот сигнал и так управляет импульсным регулятором 5 напряжения, что напряжение питания усилителя 1 мощности (т.е. на выходе импульсного регулятора 5) повторяет форму напряжения на нагрузке 2, отливаясь от него на некоторую постоянную величину. Когда же частота усиливаемого сигнала превышает частоту среза ФВЧ б и ФНЧ 7, сигнал на вход сумматора 10 поступает через детектор 8 и сглаживающий фильтр 9, и на выходе сумматора 10 имеется сигнал, повторяющий по форме огибающую уси- ливаемого сигнала. Этот сигнал срав- ^эчивается с напряжением питания элементом 4 сравнения, которое управляет импульсным регулятором 5, так, что напряжение питания повторяет форму огибающрй усиливаемого сигнала. 'О При наличии в усиливаемом сигнале составляющих с частотами выше и ниже частоты среза ФВЧ би ФНЧ 7, напряжение на выходе сумматора 10 равно сумме низкочастотной составляющей и оги- 15 бающей низкочастотной составляющей.When the frequency of the amplified signal is lower than the cutoff frequency of the HPF 6 and LPF 7 (the cutoff frequencies of these filters are chosen the same), the output of the adder 10 has a voltage that repeats the shape of the output signal, the comparison element 4 compares the supply voltage and this signal controls the pulse voltage regulator 5 that the supply voltage of the power amplifier 1 (i.e., at the output of the pulse regulator 5) repeats the form of the voltage at load 2, casting from it by some constant value. When the frequency of the amplified signal exceeds the cutoff frequency of the high-pass filter b and the low-pass filter 7, the signal at the input of the adder 10 enters through the detector 8 and the smoothing filter 9, and at the output of the adder 10 there is a signal repeating the shape of the envelope of the amplified signal. This signal ^e Chiva comparison with the supply voltage comparison part 4 that controls the pulse controller 5 so that the power supply voltage follows the shape ogibayuschry amplified signal. 'О If there are components in the amplified signal with frequencies above and below the cut-off frequency of the high-pass filter and the low-pass filter 7, the voltage at the output of the adder 10 is equal to the sum of the low-frequency component and the envelope of the low-frequency component.

Если усилитель 1 мощности выполняется по двухтактной схеме, работа устройства происходит аналогично для двух плеч усилителя. 20If the power amplifier 1 is a push-pull circuit, the operation of the device occurs similarly for the two arms of the amplifier. 20

В предложение»! устройстве КПД усилителя 1 при усилении высокочастотных . составляющих несколько понижен в сравнении с аналогичными устройствами, зато суммарный КПД всего усилителя, при прочих равных условиях ^л (типы применяемых компонентов и т.д.) выше за счет возможности значительного уменьшения частоты работы импульсного регулятора 5, а также частотный диапазон, при котором сохрани- 30 ются высокие качественные показатели и высокий КПД расширен в сторону вы- ‘ соких частот.In the offer "! device efficiency amplifier 1 when amplifying high-frequency. the components are slightly reduced in comparison with similar devices, but the total efficiency of the entire amplifier, ceteris paribus ^l (types of components used, etc.) is higher due to the possibility of a significant reduction in the frequency of operation of the pulse regulator 5, as well as the frequency range at which - 30 high quality indicators and high efficiency are expanded towards high frequencies.

Применение предложенного устройства позволяет создавать высококачественные экономичные усилители мощности низкой частоты, применяя широко распространенные компоненты.The application of the proposed device allows you to create high-quality economical low-frequency power amplifiers, using widespread components.

Claims

The invention relates to radio engineering and can be used in the output stages of power amplifiers of low frequency. A gain device is known, which contains a power amplifier with a load, a power source connected to the power amplifier through a pulse voltage regulator, between the outputs and the control input of which an element-l comparison l is turned on. However, a well-known device has a limited range, within which the high efficiency and low level of nonlinear distortion and interference are maintained. The purpose of the invention is to expand the frequency range. To do this in the device gain. containing a power amplifier with a load, a power source connected to the power amplifier through a pulse voltage regulator, between the output and the control input of which the reference element is connected, between the output of the power amplifier and another input of the reference element, are connected in series with the upper filter often detector, smoothing filter and an adder, and a low-pass filter is turned on between the output of the power amplifier and the other input of the adder. The drawing shows a structural electrical circuit of the proposed device. The amplifying device contains a power amplifier 1 with a load 2, a power source 3, a reference element 4, a voltage pulse regulator 5, a high pass filter (HPF) 6, a low pass filter (LPF) 7, a detector 8, a smoothing filter 9, an adder 10. The device operates as follows. When the frequency of the amplified signal is lower than the cutoff frequency of the HPF 6 and LPF 7 (the cutoff frequencies of these filters are the same), the output of the adder 10 has a voltage that repeats the output signal, the comparison element 4 compares the supply voltage and this signal and so controls a voltage pulse regulator 5, that the power supply voltage of the power amplifier 1 (i.e., the output of the pulse regulator 5) repeats the voltage form on the load 2, from it to a certain constant magnitude. When the frequency of the amplified signal exceeds frequency with b eza HPF and the LPF 7, the signal at the input of the adder 10 is supplied via the detector 8 and 9 sglazhivgiotsy filter and the output signal of the adder 10 there is repeated yuschy shaped envelope of the amplified signal. This signal is compared to the supply voltage of the reference element 4, which controls the pulse controller 5, so that the supply voltage repeats the form of a signal to amplify the signal. If there are components in the amplified signal with frequencies above and below the cutoff frequency of the HPF 6 and LPF 7, the voltage at the output of the adder 10 is equal to the sum of the low frequency component and the enveloping low frequency component. If the power amplifier 1 is performed in a push-pull pattern, the operation of the device occurs angrily for the two arms of the amplifier. In the proposal of the device, the efficiency of amplifier 1 when amplifying the high-frequency components is somewhat reduced q compared to similar devices, but the total efficiency of the entire amplifier, ceteris paribus (types of components used, etc., is higher due to the possibility of a significant decrease in the frequency of the pulsed of the controller 5 / and the frequency range, at which high quality performance and high efficiency are expanded towards high frequencies. The application of the proposed device allows to create high-quality These low-cost, low-power power amplifiers employing widely used components. The claims: A gain device comprising a power amplifier with a load, a power source connected to the power amplifier through a voltage regulator, between the output and the control input of which the comparison element is turned on, distinguishes furthermore, in order to expand the frequency range, between the output of the power amplifier and the other input of the reference element are connected in series the upper filter stot, a detector, a smoothing filter and adder, and between the output of the power amplifier and the other input of the adder included lowpass filter. Sources of information taken into account in the examination 1. The patent of Germany 2137249, cl. H 03 F 3/20, 1975 (prototype).