Full-bridge power amplification and n-shaped low-pass filter circuit topological structure based on SPWM technology

Abstract

The invention discloses a full-bridge power amplification and n-shaped low-pass filter circuit topological structure based on an SPWM technology in the field of sinusoidal signal power amplification circuits, which comprises two cascaded half-bridge power amplification circuits with the same structure, and further comprises an n-shaped low-pass filter circuit, the n-shaped low-pass filter circuit comprises a first inductor, a second inductor and a fifth capacitor, and the two ends of the fifth capacitor are connected with the second ends of the first inductor and the second inductor respectively, the polarities of pulse width modulation signals input by the two half-bridge power amplifier circuits are opposite, and the amplitudes and polarities of output voltage signals are the same. The full-bridge power amplifier circuit is composed of the two half-bridge power amplifier circuits, power amplification of voltage/current is achieved, the n-shaped low-pass filter circuit is designed to demodulate high-power sinusoidal signals, and under the condition of the same H-bridge direct-current power supply voltage, compared with a conventional half-bridge power amplifier and LC filter design method, the demodulated output current is unchanged, and sinusoidal voltage with doubled amplitude is output, so that the output power is doubled.

Description

Technical field[0001]The present invention relates to the field of sinusoidal signal power amplifying circuits, in particular a full bridge power amplification and a π-type low-pass filter circuit topology based on SPWM technology.Background technique[0002]The sinusoidal signal power amplification circuit is widely used in civil air, aviation, ship, weapons and other civil aviation electronic fields and communication, medical, industrial automation and other civilian electronic fields, commonly used sinusoidal signal power amplification circuit topology includes linear power amplifier circuit topology, pulse width Modulation power amplifier circuit topology. The advantages of linear power amplifiers are high precision, small distortion, but low efficiency, suitable for low power design; the advantages of pulse width modulation power amplifier are high efficiency, suitable for medium power design, but technical difficulty, output voltage amplifier In the case of the H-bridge, how to ...

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Problems solved by technology

The advantages of linear power amplifiers are high precision and low distortion, but low efficiency, which is suitable for low power design; the advantage of pulse width modulation power amplifier is high efficiency, which is suitable for medium and high power design, but the technical difficulty is relatively high, and the output voltage amplitude depends on Regarding the H-bridge DC power supply voltage, how to increase the output voltage and output power as much as possible while the power supply voltage remains unchanged has become a problem that needs to be studied

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