Design of a Sawtooth Generator Applied for Class-D Audio Power Amplifier

2012 ◽  
Vol 241-244 ◽  
pp. 693-697
Author(s):  
Zi Yi Liu ◽  
Xing Xing Jing ◽  
Wen Xi
Keyword(s):  
Circuit Design ◽  
Power Amplifier ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Voltage Regulator ◽  
Core Component ◽  
Audio Amplifier ◽  
Class D ◽  
Simulation Results ◽  
Sawtooth Generator

A systematic introduction to principles and advantages of the class-D audio amplifier based on pulse width modulation (PWM) are presented in this paper. The traditional sawtooth generator needs voltage-regulator tube to server as a core component. Against to such a disadvantage a simple way based on the charging and discharging capacitance is proposed to achieve sawtooth generator. The circuit design is based on SIMC 0.18um process. Spectre simulation results show that the sawtooth generator's performance is good. And it suits for the design of class-D audio power amplifier chip.

Modelling and analysis of a high-performance Class D audio amplifier using unipolar pulse-width-modulation

2012 ◽  
Vol 99 (2) ◽  
pp. 163-177 ◽  
Author(s):  
Zekun Zhou ◽  
Yue Shi ◽  
Xin Ming ◽  
Bo Zhang ◽  
Zhaoji Li ◽  
...  
Keyword(s):  
Pulse Width ◽  
High Performance ◽  
Pulse Width Modulation ◽  
Audio Amplifier ◽  
Class D ◽  
Unipolar Pulse

scholarly journals KARAKTERISTIK AMPLIFIER CLASS D MENGGUNAKAN FIELD EFFECT TRANSISTOR (FET) TYPE IRF9530 DAN IRF630

2020 ◽  
Vol 12 (2) ◽  
pp. 71
Author(s):  
Budi Santoso ◽  
Zainal Abidin
Keyword(s):  
Power Amplifier ◽  
Pulse Width Modulation ◽  
High Efficiency ◽  
Large Power ◽  
Class A ◽  
Audio Amplifier ◽  
Class D ◽  
Low Power Dissipation ◽  
Effect Transistor ◽  
Off Time

In the development of power amplifiers, MOSFETs are widely used in the composition of the manufacture. As is known, MOSFETs have a longer on-off time loss compared to IGBT. The loss on the on-off time has an impact on the heat generated by the MOSFET. Class D Audio Amplifier is basically a Switching-Amplifier or Pulse Width Modulation-Amplifier. High efficiency means that it will produce low power dissipation, thus the power wasted is relatively lower when compared to class A, B or AB amplifiers. Because the class D audio amplifier can be said to be more economical because it does not require a large heatsink and a large power supply. The manufacture of the Class D power amplifier system uses a voltage of 28.5 volts DC on the final transistor IRF9530 AND IRF630 measuring the input transistors of 3.3 volts DC, 28.5 volts DC. In the test using an oscilloscope type LS 8050, 50 MHz frequency, the position of the audio input off of the amplifier has sound defects. Testing of the power amplifier is carried out when the treble on the input tone control is full db in the defective amplifier wave.

The Design and Research of Switching Power Amplifier Used on Magnetic Suspension Support

2012 ◽  
Vol 150 ◽  
pp. 194-198
Author(s):  
Zhao Yuan Wang ◽  
Guo Qing Wu
Keyword(s):  
Power Amplifier ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Response Speed ◽  
Simulation Software ◽  
Magnetic Suspension ◽  
Switching Power ◽  
Simulation Results ◽  
The Given ◽  
Driving Circuit

This paper focuses on the switching power amplifier of magnetic suspension support. The principle of magnetic suspension support was described. Due to the particularity that the load of magnetic suspension support is inductive, the response speed, efficiency and stability should be considered when the switching power amplifier is designed. In the power amplifier, PI circuit can make feedback current follow the given signal in time. In this paper, the amplifier adopts pulse width modulation (PWM) control strategy. The design of PI circuit, PWM circuit as well as the driving circuit were presented in the paper. After completing the designs of all parts, we choose MULTISIM as simulation software, which can establish an accurate circuit model. The simulation results show that the switching power amplifier designed in this paper has bigger bandwidth and less distortion and it can respond timely.

scholarly journals PERANCANGAN AUTOMATIC VOLTAGE REGULATOR (AVR) BERBASIS PENGATURAN TEGANGAN CATU DAYA ARUS SEARAH INVERTER 1 FASE SINUSOIDAL PULSE WIDTH MODULATION (SPWM) SINEWAVE

TRANSIENT ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 334
Author(s):  
Yoshua Habibnur ◽  
Agung Windarta ◽  
Iwan Setiawan
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Voltage Regulator ◽  
Automatic Voltage Regulator ◽  
Sinusoidal Pulse Width Modulation

Indonesia ternyata tidak sepadan dengan kualitas listrik yang diberikan oleh PT. PLN. Tegangan PLN paling rendah yaitu 170 V yang terdapat di beberapa kota. Tidak tercapainya rating tegangan dapat menyebabkan peralatan elektronik tidak bekerja secara maksimal dan berpotensi mengalami kerusakan. Salah satu tujuan penelitian ini yaitu merancang sebuah konverter sebagai solusi dari permasalahan jatuh tegangan dan kestabilan tegangan, yaitu automatic voltage regulator (AVR) menggunakan inverter 1 fase teknik pemicuan sinusoidal pulse width modulation (SPWM) dengan pengaturan tegangan DC. Topologi pengatur tegangan DC yang digunakan adalah DC chopper buck-boost teknik pemicuan pulse width modulation (PWM) dengan umpan balik di sisi keluarannya.  Perancangan dilakukan berdasarkan ketentuan literatur terkait, simulasi PSIM 9.0 dan MATLAB 2014a. Konverter dengan sistem AVR diharapkan dapat mencapai tegangan rating dan stabil pada level 207 – 241 V sesuai standar SPLN 1:1995. Berdasarkan hasil pengujian variasi tegangan sumber dari 170 – 200 V dengan sistem AVR, konverter dapat mencapai tegangan rata – rata pada sisi DC dan AC berturut – turut sebesar 229,5 V dan 228,56 V dengan frekuensi rata – rata 50,25 Hz. Efisiensi rata –rata yang dapat dicapai oleh konverter sebesar 72,02% pada kondisi sistem AVR bekerja.

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