1、 Power system optimization

Power filter

Electrolytic capacitors convert rectified pulsating DC power into smooth DC power through their charging 

and discharging characteristics, significantly reducing the interference of power supply ripple (50Hz-100kHz) 

on audio circuits and ensuring stable operation of power amplifier chips. For example, parallel connection 

of 470 μ F-10000 μ F electrolytic capacitors at the output of a switching power supply can reduce the impact 

of high-frequency noise on Class D amplifiers.

Dynamic energy storage

Large capacity electrolytic capacitors (such as 35V/6800 μ F) serve as "energy reservoirs" and can instantly 

release 5-10A peak current when playing explosive sound effects or heavy bass, avoiding dynamic compression 

distortion caused by power response delay.

2、 Audio signal processing

Coupling isolation

In the audio signal transmission link, 10 μ F-220 μ F non-polar electrolytic capacitors are used as "AC valves" 

to block the DC bias voltage (usually 0.6-2V) of the front-end circuit, allowing only 20Hz-20kHz audio signals 

to pass through, preventing displacement damage to the speaker voice coil. For example, the coupling capacitor 

between the Bluetooth module and the power amplifier needs to have an equivalent series resistance (ESR) 

of<1 Ω to maintain high-frequency extension.

Frequency division control

In a three-way speaker, a 2.2 μ F-22 μ F thin film electrolytic capacitor and inductor form an LC frequency 

division network to achieve precise frequency point division (such as 80Hz/2500Hz). Capacitors with an error 

of less than 5% can ensure phase consistency at medium and high frequencies, avoiding ambiguity in the positioning 

of vocals and instruments.

3、 Circuit protection and performance enhancement

Temperature compensation

Using a 105 ℃ high-temperature electrolytic capacitor, the electrolyte remains stable in an environment

 of -25 ℃ to+85 ℃, compensating for parameter drift caused by temperature rise in MOS tubes, inductors,

 and other components, and maintaining a total harmonic distortion (THD) of<0.05%.

Impedance control

Parallel connection of a 0.1 μ F ceramic capacitor and a 100 μ F electrolytic capacitor at the output of a

 Class D amplifier reduces the 20kHz high-frequency impedance from 50 Ω to<1 Ω, improves the 10 μ s

 transient response speed, and enhances the Hi Res audio detail restoration capability.

Typical application configuration

Key parameter requirements for capacitance range of circuit module capacitor type

Switching power supply filter with polarity aluminum electrolysis 470 μ F-10000 μ F withstand voltage ≥

 1.5 times input, ESR<30mΩ 

Bluetooth module coupled with solid-state non-polar electrolysis 10 μ F-100 μ F loss angle tan δ< 0.1@20kHz  

High frequency divider network metalized polypropylene film capacitor 2.2 μ F-22 μ F accuracy ± 3%, withstand voltage 100VDC

Power amplifier decoupling low ESR high-frequency electrolysis 100 μ F-470 μ F ripple current ≥ 2A@100kHz  

Note: Modern smart speakers commonly use solid-state electrolytic capacitors instead of traditional liquid capacitors, increasing

 their lifespan from 2000 hours to 50000 hours while reducing ESR by over 60%.

About Us

Guangdong Fulong Electronic Technology Co., Ltd. is a private high-tech enterprise specializing in the research and development, manufacturing, and sales of aluminum electrolytic capacitors, certified by IATF16949，ISO9001, ISO14001, and ISO45001. The company has a building area of 17000 square meters and more than 50 automated production lines; The total investment is 50 million yuan (RMB), with more than 100 employees, including more than 20 engineering and technical, quality management, and production management personnel. The annual production of capacitors (4 * 5.4~16 * 21.5) is about 400 million pieces; Our products are mainly sold to domestic and international markets, and we strive to promote our company's products globally.

Jiangxi Fulong Electronic Technology Co., Ltd. is a wholly-owned subsidiary of Guangdong Fulong Electronic Technology Co., Ltd. established in Hukou County, Jiangxi Province with a total investment of 500 million yuan. It has 50 fully automated production lines and an annual output of approximately 1.2 billion capacitors (4 * 5.4~16 * 21.5).

Fulong Group has an international professional core technology research and development team for aluminum electrolytic capacitors and a global sales network. Rich experience in the design, research and development, and production management of aluminum electrolytic capacitors. The R&D team follows the technical design theory of aluminum electrolytic capacitors, complies with international and domestic legal and regulatory requirements (RoHs), and adheres to the highest international quality standards

Fulong Group has high-quality and stable raw material supply partners, and key raw materials (such as aluminum foil, electrolytic paper, etc.) are selected from well-known Japanese and Korean companies (KJCC KDKNKK, etc.), ensuring reliable and stable advantages in product quality, environmental protection, safety, and energy conservation.

Fulong Group has a group of highly qualified professional technicians and management personnel who can produce various series of sheet aluminum electrolysis products according to customer requirements. The products include high-frequency low impedance, low leakage, wide temperature, extremely low impedance, non-polar, ultra long life, medium high voltage long life, high reliability and other new types of special requirements for surface mount products; At the same time, the company's products can withstand a soldering temperature of 260 ℃, meeting the lead-free reflow soldering technology required for SMT in the whole machine factory. All technical indicators of the products have reached or exceeded the international level of similar products.

While strengthening management and expanding operational scale, Fulong Group is also committed to improving its competitiveness and customer satisfaction, continuously and steadily increasing customer and social trust, continuously meeting market demand, further optimizing environmental management and expanding social contributions, and developing together with the electronics industry.

Guangdong Follon Electronic Technology Co., Ltd.

Jiangxi Follon Electronic Technology Co., Ltd.

Address: Building 3, South District, Haishan Science and Technology Park, Hukou County, Jiujiang City, Jiangxi Province

www.follon.com

Professional manufacturer of high-quality surface mount electrolytic capacitors