Bipolar soft-switching PWM power amplifier

A power amplifier and soft switching technology, applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, electrical components, etc., can solve the problems of reduced efficiency, large switching loss of power tubes, limited switching frequency, etc., to improve efficiency , The effect of reducing switching loss and increasing switching frequency

Active Publication Date: 2012-12-12
ENPING CE ANCE ELECTRONICS TECH
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Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a bipolar soft-switching PWM power amplifier suitable for audio power amplification, combined with the soft-switching technology in the switching power supply, it solves the problem that the switching loss of the power tube in the prior art is large and the efficiency is reduced, The problem of limited switching frequency

Method used

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  • Bipolar soft-switching PWM power amplifier
  • Bipolar soft-switching PWM power amplifier

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Embodiment Construction

[0021] refer to figure 1 , a bipolar soft-switching PWM power amplifier of the present invention includes a power supply 9 for providing energy and: a comparison unit 1, including a first input end 11, a second input end 12, a first output end 13 and a first input end 13. Two output terminals 14, the comparison unit 1 outputs the first signal and the second signal from the first output terminal 13 and the second output terminal 14 after processing the input signals of the first input terminal 11 and the second input terminal 12; pulse The width modulation signal output unit 2 outputs a power pulse signal according to the first signal output by the first output terminal 13 of the comparison unit; the conversion switch group 3 includes a switch tube, and the switch tube outputs the power pulse signal according to the pulse width modulation output unit The signal is turned on and off; the first transformer 5, the primary side is connected to the conversion switch group 3, and pro...

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Abstract

The invention discloses a bipolar soft-switching PWM power amplifier. The power amplifier comprises a power source used for providing energy and a comparing unit, a pulse width modulation signal output unit, a full-bridge transfer switch block, a first transformer, a pulse polarity switch unit and a polarity transfer switch block. The output voltage of the power amplifier of the invention can be changed between the positive voltage and the negative voltage, namely the output voltage has bipolarity, thus better satisfying the application field of the audio power amplification; in addition, thecircuit structure of the invention can adopt the soft-switching technology of the switch power supply, and the switch tube can realize zero voltage switching in work to effectively reduce the switching loss so that the switching frequency of the PWM power amplifier can be increased so as to provide the signal-to-noise ratio of the amplifier and the volume of the output low-pass filter needed by the well known amplifier can be reduced.

Description

technical field [0001] The invention relates to a power amplifier, in particular to a bipolar soft-switching PWM power amplifier. Background technique [0002] According to the currently known PWM audio power amplifier devices, such as class D power amplifiers, most of the power switches work in the hard switching mode, that is, during the process of turning off or turning on the power switch, the voltage and current that the switch bears are not zero. , so it is accompanied by a large loss during the turn-on or turn-off process, that is, switching loss. The higher the switching frequency, the greater the switching losses, and the high-frequency electromagnetic interference generated by the hard switching process. Therefore, the switching frequency of the hard-switching PWM audio power amplifier should not be too high. [0003] Soft switching technology is widely used in the design of switching power supply to solve the problem of switching loss of power switch tubes. Howe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/217
Inventor 吕盼稂吴健新
Owner ENPING CE ANCE ELECTRONICS TECH
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