#switching power supplies

[audio-luddite]

I have a problem with Class D amps

There I said it. It has nothing to do with anything I have heard in a big system. I had a Class D amp in my old car as I wanted to keep the drain on the battery minimal. I liked it there. Also it ran off a battery not wall current. DC as from a battery is different.

The Class of a circuit has nothing to do with quality. Class A is not better than B or A/B or C or D or whatever. It is purely a description of how the thing works. Marketers will spin things and exploit the ignorance of the consumer. But enough of my mini rant.

Class D is not digital per se. It uses digital methods but specifically those are for what is called switching and modulation. The signal is boosted using a high frequency carrier to create a sequence of digital pulses that are summed to model an audio frequency signal. The sequence is a digital Pulse Code Modulation. The ironic part is the summing feature is a straight forward analog filter. A very nice capacitor acts to sum the signal and an inductor blocks the carrier frequency. Almost caveman electrically speaking.

My problem is conceptual and to do with the power supply. An analog preamp or amp uses a transformer in the power supply. It converts the voltage and current of the household wall into a level the device wants. My franken amp for example wants 70 to 80 volts in its rails. That is less than the 120 in my wall or the 240 in many other places. The transformer is a big heavy lump of metal.

The big lump method develops a smooth series of waves of electric power that is passed by diodes and rectified into pulses of plus and minus volts. Those pulses (at a low frequency of 60 or 50 Hz) are filtered into big capacitors that provide the reservoir of power to the circuit. It is like a big river with rapids and falls flowing into a calm lake behind a big dam.

Class D uses switching power supplies. They don't have to, but it means they can avoid those heavy lumps we call transformers. So they do. The way a switching supply works is to watch the voltage rise in its respective positive and negative side and when it hits the voltage it wants it blocks any more to zero. It turns off the tap as it were. A power signal rises from say 0 to 80 volts and then the PS circuit blocks the rest. The power delivered is the area under the triangular plot of the incoming voltage to the blocking level. That is less than the area under the full wave. They could burn the excess with a regulator but that is very energy inefficient as burn is the right word. It goes to heat. Complete blocking saves coal.

Yes an analog rectifier only uses the tip of the wave to keep the capacitors charged. If there is a big enough demand the voltage may drop a bit, but it is into the fattest part of the sine curve top. If my franken amp had a switching PS it would be blocking most of the charging wave and only the tiny pointy tip of the triangular wave near 80V is keeping the capacitors fed. That is smaller.

I guess if you had even more and bigger capacitors after a switching supply it would be fine. But those are large and expensive so they put in small ones. If you look at some of those Class D kits the power supplies are small and cute even for a 700 Watt amp. Complete Class D amps are small and light and easy to ship even if they are powerful.

A switching PS cannot deliver as much current or put another way Volt*Amps into an amplifier. I think that is a serious flaw.

My one consistent amplifier tweak is to bump up the capacitors in a PS. The Franken Amp has 1,040,000 micro Farads of capacitance in the PS. It has a very audible effect. I also split the two stereo channels so each have their own reservoir so cross talk through the PS is impossible. I can hear that easily.

I know it is better that way.

I may think of a Class D in my new car. Gotta save the battery you know.

[alongtidesoflight]

> get home from work

> do the same thing at home that you did at work because your computer broke down for no discernible reason at all

[272stevenfang]

We have accumulated over 17 years of professional experience in manufacturing high-frequency transformers, inductors, and LED light power drive switch power supply sources. Unlike a trading company, we are a factory dedicated to producing these electronic components. Over the past 15 years, we have established long-term partnerships with five loyal customers in China who regularly place customized orders for the aforementioned products. These valued customers are trusted suppliers of raw materials for renowned Chinese enterprises such as Xiaomi, Huawei, YAG, Emma and others.

[jsn2aham]

https://www.futureelectronics.com/p/semiconductors--discretes--transistors--mosfets/bsz160n10ns3gatma1-infineon-8060177

Mosfet transistor, power supply, power mosfet module, small signal mosfet

Single N-Channel 100 V 16 mOhm 19 nC OptiMOS™ Power Mosfet - TSDSON-8

[dvin2insin]

https://www.futureelectronics.com/p/semiconductors--discretes--transistors--mosfets/irlml2502trpbf-infineon-6173881

High voltage mosfet, Small signal mosfet, mosfet voltage, linear mosfet, switch

N-Channel 20 V 0.045 Ohm Surface Mount HEXFET Power Mosfet - Micro3

[lthrer2oth]

https://www.futureelectronics.com/p/semiconductors--Led-lighting-components--led-driver-modules-rev--constant-current-acdc-led-drivers/xi100c410v024fns1-signify-north-america-1087256

PNP transistor led, What is led driver, adjustable constant current led driver

100 - 277Vac, 100W, 4100mA, 12-24V, IP66 LED Driver

[henryuan]

Reliable High Efficiency AC DC Adapter 28Vdc 10A Power Supply

Henryuan High-Quality AC DC Adapter 28Vdc 10A Power Supply

Product Overview:

Henryuan 280W 28V 10A AC/DC adapter switching power supply is a premium power solution designed for a variety of applications. With advanced power supply design and robust protection features, this adapter ensures safe and stable operation. Ideal for aerospace and avionics, automotive and heavy vehicles, industrial automation, medical equipment, telecommunications, renewable energy systems, consumer electronics, railway and transportation, military and defense, test and measurement. 

Safety and Certification:

Our power supplies are rigorously tested and certified to meet global standards, ensuring safety and reliability. Certifications include:

UL, ETL, cUL, FCC, PSE, CE EMC, LVD, UKCA, SAA, KC, CCC

Input Specifications:

Input Voltage: 90Vac - 264Vac

Rated Input Voltage: 100Vac - 240Vac

Frequency: 47Hz - 63Hz

Input Current: 5A

Inrush Current: 60A

Output Specifications:

Rated Output: 28V at 10A

Voltage Range: 26.6V - 29.4V (28V ± 5%)

Current Range: 0A - 10A

Total Power: 280W

LED Indicator: Included for operational status monitoring

Protection Features:

Our power supplies include multiple layers of protection to ensure safe operation:

Over-Current Protection

Over-Voltage Protection

Short Circuit Protection

Hiccup Protection

Quality Assurance:

Experienced Sales Team: Our sales engineers have over a decade of experience in understanding and meeting customer needs.

Rigorous Material Selection: We employ a strict process for choosing raw material suppliers and conduct thorough incoming material inspections.

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Comprehensive Testing: 100% aging testing up to 4 hours at full load to guarantee reliability.

Responsive After-Sales Support: A robust system for handling customer feedback, with resolutions typically within 48 hours.

About Henryuan Group

With over 13 years of experience in the production and R&D of switching power supplies, Henryuan Group is a leading supplier in the industry. Our 28V 10A  are renowned for their superior performance and safety, making us a trusted choice worldwide. Our power supplies are exported to markets across the Americas, Europe, Asia, and Australia, maintaining a high market share due to their excellent EMI performance and low ripple characteristics.

Our team of experienced engineers is dedicated to meeting customer requirements, whether for existing products or during the development stage. We offer a range of 28V power supplies, including models with output currents from 0.3A to 15A, to suit diverse applications.

More Switching Power Supply Links:

Explore More Switching Power Supplies.

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For a safe, reliable, and efficient 280W 28V 10A switching power supply, contact Henryuan’s sales engineers today. Let us provide you with the ideal solution for your power needs.

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[selectechsg01]

Expert DC Switching Power Supply in Thailand by Selectech

Selectech is your trusted source for high-quality DC switching power supplies in Thailand, sourced directly from top-tier manufacturers. With a deep understanding of the electronics industry and a commitment to excellence, we provide comprehensive solutions to meet your power supply needs.

Why Choose Selectech for Your DC Switching Power Supply Requirements?

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Whether you require standard or custom DC switching power supplies in Thailand, Selectech is your ideal partner. Our dedication to quality, efficiency, and customer satisfaction sets us apart. Contact us today to discuss your project and discover how we can help you achieve your goals.

Contact Us: For inquiries and orders, please contact us at:

Phone: +65 6744 9695 /+65 6744 9641

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Website: www.selectech.com.sg

[antecblogs]

https://antecblog.com/exploring-smps-power-supply-prices-trends-insights/

In the ever-evolving landscape of computer hardware, the role of a robust and efficient SMPS (Switched-Mode Power Supply) cannot be underestimated. As technology advances and computing demands become more sophisticated, understanding the nuances of SMPS power supply prices becomes essential. This article aims to unravel the complexities of SMPS pricing trends in the Indian market, empowering consumers with knowledge to make informed purchasing decisions.

[lrry2land]

https://www.futureelectronics.com/p/semiconductors--discretes--transistors--mosfets/irf644pbf-vishay-2537231

Mosfet transistor, mosfet gate, mosfet module, Mosfet vs transistor

Single N-Channel 250 V 0.28 Ohms Flange Mount Power Mosfet - TO-220AB

[crhl2ellee]

https://www.futureelectronics.com/p/semiconductors--discretes--diodes--schottky-diodes/bat54cw-7-f-diodes-incorporated-1106541

Power Schottky Rectifier, Low noise switching, Schottky diodes, power supplies

BAT54W Series 30 V 600 mA Surface Mount Schottky Barrier Diode - SOT-323

[quirksphere]

Seamless Power Transfer with High-Quality Transfer Switches Ensure uninterrupted power supply with a reliable transfer switch. Learn how to maintain continuous operations by seamlessly switching between primary and backup power sources. Transfer switches are critical for ensuring that your operations don't halt during power outages, providing a seamless transition to backup power.

[clid2dcol]

https://www.futureelectronics.com/p/semiconductors--discretes--diodes--ultrafast-rectifiers/murs160-e3-52t-vishay-9370859

Switched mode power supplies, FER GPP, what is an ultrafast rectifier

MURS160 Series 600 V 1 A 50 ns SMT Ultrafast Plastic Rectifier - DO-214AA

[jhn2quin]

https://www.futureelectronics.com/p/semiconductors--discretes--diodes--scottky-rectifiers/pmeg4050ep-115-nexperia-5015646

Schottky transistor, Schottky Mosfet, Schottky barrier diode, hot carrier diode

PMEG4050 Series 40V 3 A Low VF MEGA Schottky Barrier Rectifier - SOD-128

[loni2livn]

https://www.futureelectronics.com/p/semiconductors--discretes--diodes--scottky-rectifiers/pmeg4050ep-115-nexperia-4951570

TV tuners, high frequency, power management circuits, power supplies

PMEG4050 Series 40V 3 A Low VF MEGA Schottky Barrier Rectifier - SOD-128