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Digital power amplifier and control method thereof

A digital power and control method technology, applied in the direction of power amplifiers, etc., to achieve the effect of simple control circuit structure, basically fixed switching frequency, and reduced influence

Inactive Publication Date: 2011-04-13
徐州泰思电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve some unsatisfactory problems in the existing power amplifier technology, the present invention provides a digital power amplifier and its control method, which keeps the switching frequency of the amplifier constant, so that it is easy to avoid some important signal bands, and at the same time The structure of the control circuit is simple, and some devices can be integrated

Method used

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  • Digital power amplifier and control method thereof

Examples

Experimental program
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Embodiment 1

[0028] Embodiment 1: In the figure, the digital power amplifier and its control method include a digital power amplifier and a load. A high-frequency triangular wave with a Vcc / 2 DC bias and a frequency of about several hundred kilohertz is added to the non-inverting input pin (A) of the comparator, and the inverting input terminal Nin (B) of the comparator is grounded through a capacitor Cint. Input the capacitor Cin and the resistor Ri to charge / discharge the capacitor Cint. The output PWM wave of the comparator passes through the driving circuit to control the transistors M1 and M2 to be turned on alternately. The source of the transistor M1 is connected to the output node C, while the source of the transistor M2 is grounded, and the drain of the transistor M1 is connected to the power supply Vcc, and the transistor M2 The drain of is connected to the output node C, and the transistors M1 and M2 act as switches, which form part of the output stage of the digital power ampli...

Embodiment 2

[0030] Embodiment 2: In the previous embodiment, it is required that the slope of the given triangular wave should always be greater than the voltage at the inverting input terminal Nin, that is, the slope of the high-frequency charging and discharging ripple on the integrating capacitor Cint, and the charging and discharging effect of the triangular wave on the capacitor Cint should also be strong. Based on the charging and discharging effect of the feedback signal SW signal on the capacitor Cint. Similarly, in this embodiment, the charging and discharging effect of the given square wave on the capacitor Cint is also stronger than the charging and discharging effect of the feedback signal SW signal on the capacitor Cint.

[0031] attached Image 6 The main working waveform of the circuit is divided into 5 stages:

[0032] The first stage (t0-t1); at time t0, the square wave changes from high to low, the SW signal and the square wave signal discharge the capacitor Cint at the...

Embodiment 3

[0038] Embodiment 3: The present invention can also be applied in a bridge-tied load (BTL) power amplifier, and the inherent differential output structure of the bridge topology can eliminate harmonic distortion and DC bias.

[0039] The H-bridge has two half-bridge switching circuits, usually powered by a single power supply Vcc. For a given Vcc, the differential mode of the H-bridge circuit provides twice the maximum output signal amplitude of the single-ended mode, and the output power is four times that of the single-ended mode. times, only one comparator is used here, and its output passes through the drive circuit to control transistors S1, S2, S3 and S4, so that S1, S4 and S2, S3 are alternately turned on, so as to obtain SW1 and SW2 signals with opposite phases, and SW1 and SW2 Rectified and filtered by L1, C1, L2, and C2, respectively, and sent to both ends of the load. Between SW1 and SW2, only one of them needs to be fed back for the feedback control loop. Attached ...

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Abstract

The invention relates to a digital power amplifier and a control method thereof. The digital power amplifier and the control method thereof can be used for feeding back a signal of an output node to the inverting input end of a comparer and simultaneously supplying a high-frequency triangular wave signal to the non-inverting input end of the comparer; and besides, the digital power amplifier and the control method thereof can also be used for connecting a bias voltage to the non-inverting input end of the comparer and connecting a fixed-frequency square wave signal, a feedback signal obtained from an output stage and an amplifier input signal to the inverting input end. The digital power amplifier and the control method thereof can keep the advantages of an adaptive modulation control technology at the same time of ensuring the switching frequency to be basically stable, thereby reducing the influence of EMI (Electro-Magnetic Interference) on a system; and in addition, a control circuit has simple structure.

Description

technical field [0001] The present invention mainly relates to a power amplifier, in particular to a digital power amplifier and a control method thereof. Background technique [0002] At present, digital power amplifiers have many different types of effects, such as class A, class B, class AB, etc. The difference between digital power amplifiers and other power amplifiers is that they are basically switching power amplifiers or pulse modulation power amplifiers. In this digital power amplifier, The device is either fully turned on or completely turned off, which greatly reduces the power consumption of the output device. The audio signal is used to modulate the pulse width modulation (PWM) carrier signal. The carrier signal drives the output power stage to obtain a high frequency PWM square wave. Finally The audio signal is output to the load through a low-pass filter. At present, when designing digital power amplifiers, people attach great importance to improving their pow...

Claims

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Application Information

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IPC IPC(8): H03F3/20
Inventor 庄磊
Owner 徐州泰思电子科技有限公司
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