Key benefits of power switching amplifiers include:

· Energy Saver design

· Ultra-rugged, reliable Silicon Carbide (SiC) MOSFET Technology

· Totally air-cooled

· Modular layout from 20 to 725 KVA

· Class D, high-efficiency switching design: >90% efficiency

· EMI shielded cabinet

· Small footprint with up to 125 KVA per bay

· Increased shock performance

· Safety interlocks for operator & system protection

· NO transformer coupling

· Very low maintenance

PA Series

Jianqiao Power Amplifiers have become a benchmark in class D power amplifier design for electrodynamic shakers. Representing the latest technology in Silicon Carbide (SiC) MOSFET circuit design, these amplifiers provide one of the most efficient totally air-cooled designs in the industry. These compact amplifiers are modular in design and can be configured from 20 KVA up to 70 KVA in one to six bay consoles.

Use of proven, ultra-rugged Silicon Carbide (SiC) MOSFET's offers even more efficiency and performance than the older MOSFET and IGBT based amplifiers. This major enhancement has allowed amplifiers to achieve up to 25% higher peak current than amplifiers using IGBT's, a major boost for both Random and Shock testing. All PA Series Amplifiers include a comprehensive operating/status meter panel for push-button startup and monitoring of critical amplifier/shaker status, voltages and currents. A simple push-button selection provides for external startup through a simple contact closure.

Advanced designs in filtering and shielding have provided significant improvements in the reduction of radiated and transmitted emissions (EMI). The standard PA Series power amplifiers are provided with a special EMI shielded console designed with minimal penetrations including metal gaskets on all external joints, special plating for better electrical continuity and corrosion protection, EMI shielded cooling ducts, and 3-phase line filtering.

Elimination of Water Cooling

PA Series power amplifiers are 100% air-cooled, eliminating cooling water consumption and the related expenses associated with maintaining cooling towers (chillers), pumps and leaky pipes/hoses.

Reduced Power Consumption

Energy Saver PA Series power amplifiers are over 90% efficient and typically use less than half the 480V (380V) 3-phase power that existing linear power amplifiers consume for the same test. Further power savings are achieved due to the reduced load on the cooling tower (or chiller) which previously had a combined load from the shaker and power amplifier. A typical 20,000 lbs force vibration system with an old technology linear amplifier rejects about 170 KW to the cooling water loop at maximum force output. After replacing the original linear amplifier with an air cooled SA Series Amplifier, the total system heat rejected to the cooling water loop is only 50% of the original load. This results in major savings at the cooling water tower (chiller). Conversely, this extra 85 KW of cooling capacity could be used for other lab equipment.

Reduced Floor Space

A typical water cooled linear amplifier rated at 120 KVA output is housed in a 5 or 6 bay console, occupying approximately 30 sq. ft. of actual floor space plus another 25 sq. ft. for required wall clearance. The Model PA 125 (125 KVA) is housed in a 1-bay console (5 sq. ft. plus wall clearance). This floor space advantage speaks for itself.

Increased Random and Shock Performance

The PA Series amplifiers typically provide at least 10% more random vibration performance and 50% more shock performance than a comparable linear amplifier. Contact Jainqiao for the performance characteristics on your specific shaker/amplifier combination.