Precise Energy Control: The Core Role of High-Voltage Doorknob Capacitors in Advanced Materials Processing Equipment

Plasma cleaning, magnetron sputtering, laser surface modification—these advanced materials processing processes are reshaping the boundaries of modern manufacturing. At their core, they all require highly controllable conversion of electrical energy into a specific energy source that acts on the material surface. In this conversion chain, high-voltage doorknob capacitors play a critical role in energy regulation and stabilization, serving as the silent cornerstone for process consistency and reliability.

Material processing places stringent demands on power supplies
To achieve repeatable, high-quality processing results, the high-voltage power supply powering the process chamber must meet the following requirements:

Extremely stable and low noise: Slight fluctuations in voltage or current can directly alter plasma density, laser energy, or sputtering rate, resulting in batch-to-batch variations in processing performance.

Efficient pulse power capability: Many surface treatment processes (such as pulsed laser deposition and pulsed plasma) rely on high-frequency, high-energy, instantaneous pulses, requiring power supplies with fast response capabilities.

Strong load shock resistance: During the process, igniting and maintaining the plasma can cause drastic load fluctuations, requiring the power supply system to remain stable and prevent downtime.

The core function of doorknob capacitors: energy buffering and filtering.
In high-voltage power supplies for materials handling equipment, doorknob capacitors are key components of the DC bus support and pulse-forming networks.

DC link support and filtering: At the output of switching power supplies, they effectively smooth high-frequency ripple, providing clean, stable DC high voltage to the load, ensuring an absolutely stable "baseline" for process energy input.

Pulse energy reservoirs: In pulsed power applications, they act as transient energy storage, charging between pulses and releasing all energy through switching within microseconds or nanoseconds, generating high-peak power pulses.

Our solutions: Designed for demanding processes.
Our high-voltage doorknob capacitors offer targeted advantages for the demanding needs of materials handling:

Excellent energy density and rapid charge and discharge capabilities: Utilizing specialized ceramic dielectrics, they store large amounts of energy in a compact package and support repetition rates of thousands to tens of kilohertz, meeting the demands of efficient pulsed processes.

Extremely low equivalent series inductance (ESL): Optimized internal structure and terminal design minimize parasitic inductance, ensuring instantaneous, zero-delay energy delivery and a sharp pulse front when delivering nanosecond-fast pulses.

Rugged and durable for industrial environments: Epoxy resin vacuum casting combined with a metal housing provides excellent resistance to moisture, dust, and chemical corrosion, ensuring long-term, stable operation in complex industrial environments.

Choosing our high-voltage door handle capacitors for your material handling equipment means choosing precision and absolute control over core process energy.

Xian Xiwuer Electronic & Info. Co., Ltd. is a wholly state-owned company with a registered capital of 91.46 million RMB Yuan, owning a total assets of 315 million RMBYuan, under the jurisdiction of Xi'an State-owned Assets Supervision & Management Committee. There are about 400 employees, with an annual sales income of 250 million RMB Yuan.

The main products include Zinc Oxide Varistors, thermistors, H-V ceramic capacitors, SPD, and Solar Energy Surge Protective Devices. The company has advanced production equipment, including 18 large sintering furnaces, 8 automatic assembly lines, the largest energy impulse current generator and a series of special test equipment and environmental test equipment. In the same industry in China, the company has the largest production capacity and the highest degree of automation with the most complete testing methods.

Our employees are 8 with master's degrees and more than 80 engineers with senior technical titles. 12 technicians have been awarded Experts with Outstanding Contributions by the Xian municipal government, and 1 expert has been enjoying a special allowance from the State Council.

The company has five sites for business production and operation, covering an area of 50,000 square meters. Its construction area is up to more than 54,000 square meters.

· No.99, Fengqing Road, Lianhu District, Xi an(ceramic capacitor)

· No.1118, Ziqaing Road, Xincheng District, Xi' a (Headquarters, varistors, thermistors)

· No.11, Longshou South Road, Lianhu District, Xi' a (Registration, photovoltaic lightning protection box)

· Block A, No.18, Gaoxin Road, High-tech District, Xi' an

· Jinghe New Town Xi Xian New Area(the new plant)

• Xian Xiwuer Electronic and Info. Co., Ltd. is a wholly state-owned company with a registered capital of CNY 101.465 million (exchanged to USD 15.85 million), owning total assets of CNY315 million (traded to USD 49.22 million). It was established in 1976. Currently, it has about 460 employees, with an annual sales income of CN280 million (exchanged to USD43.75 million). The company has four production and business bases covering an area of 43052 square meters, and a construction area of more than 50000 square meters. The company has 8 persons with master's degrees, more than 80 engineers with senior technical titles 12 technicians who have been awarded Experts with Outstanding Contributions by the Xian municipal government, and 1 expert who has been enjoying a special allowance from the State Council.

• The main products include

            • Smart Embedded Epoxy Pole；

            • Integrated Instrument Transformer

• Capacitive Voltage Divider；

• High Voltage Capacitor Rod；

• High Voltage Film Capacitor；

• High Voltage Resistor；

• Primary and Secondary Integrated Intelligent assembly and components with the function of voltage measurement, current measurement, protection, temperature monitoring, and power supply；

• Medium-High Voltage components/parts/ assembly；

• Surge Protective Device for Power Supply System；

• Chips for lightening devices；

• Zinc Oxide Varistor；Thermistor.

Major Customers: ABB, Schneider, GE, ZTE, XD Electric, XJ Electric, PingGao Electric and etc.

• The company has the provincial Technical R&D Center. The company has developing and manufacturing experiences of the key products HV Ceramic Capacitor, SPD, Varistor, Thermistor and for nearly 20 years. There have been 32 patented technologies, 4 invention patents, and 4 national key new products. The company is in the leading position in the same industry. The company has grown very fast with a unique management system which is the fundamental guarantee to the continuous development of the enterprise under the state-owned system. In Northwest China, the company is the first to implement ISO 9001 standards and the first to promote the use of ERP management systems, having achieved ISO9001, ISO14001, and ISO45001 approval, thus standardizing and improving the management level of the company.
• Through continuous technological innovation, product R&D, and quality improvement the main technical performance and reliability of the products are at the internationally advanced level the same level as Panasonic and Siemens. The products have UL, VDE, TUV, CAS, CE, CQC, RoHS, and REACH certifications. The company has advanced production equipment among which the key production equipment and modern assembly lines are imported from Japan, the U.S.A, Germany, Korea, and Belgium including 26m large sintering tunnel furnaces8 automatic assembly lines, the largest energy impulse current generator and a series of special test equipment and environmental test equipment. In the same industry in China, the company has the largest production capacity and the highest degree of automation with the most complete testing methods. The company has two routine test laboratories with the most advanced lightning testing equipment and environmental testing equipment which comply with national standards for laboratory construction. They are the significant laboratories supported by Shaanxi Province with professional testing technicians undertaking part of the supervision and inspection of electronic products in Shaanxi Province at the same time.
• We believe we are able to supply satisfied goods and services to customers at home and abroad with the most reasonable price and the shortest delivery time. on the basis of our excellent quality assurance capacity, technical development capacity, and rich manufacturing experiences.

Through continuous technological innovation, product R&D, and quality improvement, the main technical performance and reliability of the products are at the international advanced level, at the same level as Panasonic and Siemens. The products have UL, VDE, TUV, CAS, CE, CQC, RoHS, and REACH Certification