Before I share PCB Layout about full-bridge class-d power amplifiers with 2000W power I will tell you a little more about class-d power amplifiers.
Class D amplifiers are known as PWM (Pulse Width Modulation) amplifiers or Switching amplifiers which are now increasingly popular in use. Replaces the class AB amplifier that has been used a lot before
Then what is the D class amplifier like? And what are the advantages?
Class AB amplifiers have a relatively large "power dissipation" (loss of power) that requires a large amount of heat sink. The greater the power (Watt) of class AB amplifiers, the greater the cooling needed. Here there is more or less a power loss of about 25 ~ 40% which turns into heat, which must be removed through the cooler.
Class D amplifiers produce almost no heat so they don't need a cooler. The efficiency achieved is close to almost 100%, only requires a little space and a few supporting components, and of course, the price becomes cheaper. Only the INDUCTOR and CAPACITOR components of filters in class D eat a lot of space.
The working principle of Class D Amplifiers
Sound signal (audio) is a signal in the form of Sinus. Class D amplifiers first convert these sound signals into "ON-OFF" pulses (such as switching) with "period length" which can change as shown below (indicated by Vo). Therefore class D is also called PWM (Pulse Width Modulation)
To change the input signal in the form of a sine to a PWM signal, a triangle oscillator is used and a comparator as shown below.
Then the PWM signal is amplified using the Gate drive amplifier and an amplifier Output using the FET (MOSFET).
The output signal in the form of PWM pulses is then converted back into a sine signal using "Low Pass Filter" (which consists of Lf + Cf) before being to the Speaker.
The following is the PCB layout of a Power Amplifier Class full D2K bridge with a double layer layout:
The problem and input for this full-bridge amplifier.
- 2x Core MS157060, 19 turns for 90Vdc. 4x157060 14 turns to supply 90Vdc to 130Vdc
- Mosfet IRFP4227 for supply 90Vdc. IRFP4229 / IRFP4332 / IRFP4242 / IRFP4768 / IXTQ76N25 for supply 120Vdc. Another Mosfet is not recommended.
- If you have installed the components according to the PCB it still does not sound, all the installation has been checked correctly then 99% is certain there is a defective component. The often defective component is logic 4030/4070. Both Op Amp, third IR2110 / IR2113
- The supply voltage is required to fit the recommendation.
- The recommended load impedance is 4 ohms or 8 ohms. Because the feedback loop and LPF have been maximized.
- Installing a supply with low voltage causes a clip and causes the amplifier to break down.
Video Build and Tested Power Class-D Full-bridge Amplifier - D2K