Ten Pao Group was established in 1979 and listed in 2015 in Hong Kong(Stock Code: 1979).It mainly provides “one-stop smart power supply solutions”. With nearly 40 years of experience, it has become trusted supplier for various international brands.

Ten Pao Group has always been committed to developing diversified power supply products. Our switching power supply units are applied in various industry sectors, including switched-mode power supply (SMPS) units for consumer products (telecommunications equipment, media and entertainment equipment, electronic cigarettes, home electrical appliances, LED lighting and health care products); smart chargers and controllers that are mainly applied to power tools for industrial use; charging equipment for new energy electric vehicles (two and four wheels vehicles). 

The semi-anechoic chamber was designed and undertaken by Thunderstar anechoic technology,Inc and completed in the prescribed time and passed the acceptance. After the product is completed and accepted, it will continue to assume responsibility for quality assurance, warranty, maintenance and technical support. The installation location is within the demand side factory

Product project content:

The construction plan and materials for the semi-anechoic chamber installation project shall be designed and installed by Party B. Party B shall apply all or part of its “turbocharged micro-cycle frequency conversion noise reduction ventilation” (Patent No.: 200520108948.5) to Party A’s semi-muffling. Room installation project construction;

1) The effective net size inside the semi-anechoic chamber installation project: 3000m × 2800mm × 2400mm, the external effective dimensions after manufacture are: 5000mm × 4800mm × 3610mm;

2) Installation project of semi-anechoic chamber: install 4 professional lighting lamps with no echo and no noise, and 6 2-3 plugs shall be extended to the concave shape interior suitable for use of the sound absorbing anechoic cleft.  3) Personnel access door size: W × H = 0.8 × 2.0 (m);

Semi-anechoic chamber product acceptance main terms:

In the absence of external abnormal interference, when the external noise is ≤60dB(A), the noise floor is ≤12dB(A);

The cutoff frequency of the approximate semi-free field environment above the indoor reflecting surface is satisfied. Fc ≤ 100 Hz

1. Sound insulation design to achieve background noise index

2, sound absorption design to achieve the performance of semi-free sound field

3, noise reduction design to achieve aerodynamic performance

1. Ambient noise value Len(A)=60dB(A), indoor noise floor value Lgn(A)=8.9dB(A);

2. Performance of semi-free sound field: 1/3 octave band analysis is performed in the frequency range of 100 Hz to 20 kHz, and the spatial pressure of the sound pressure emitted by the test sound source is attenuated, and the sound pressure is inversely proportional to the square of the distance in the ideal semi-free sound field. The attenuation of the law is compared with the deviation of the law within the maximum allowable deviation.