Absorption Capacitor

1. Product Introduction

The Absorption Capacitor is designed for use in IGBT circuits, switching equipment, and related power electronic applications. It can be used in suitable circuit designs to absorb transient voltage disturbances and help control switching-related electrical stress, depending on the circuit configuration and component selection.

With a rated DC voltage range of 600–5000 V and capacitance options from 0.1 to 6 μF, this capacitor supports different power electronic design requirements. Available construction options include a plastic housing or Mylar tape, with dry-type and resin-potting configurations specified for the product range.

The capacitor is designed for an operating temperature range of -45°C to +85°C, with an expected lifespan of 100,000 hours under specified operating conditions. Final performance depends on voltage stress, switching frequency, current waveform, ambient temperature, and thermal management.

Wuxi Power Filtering Co., Ltd. specializes in the research, development, and production of power electronic capacitors, pulse capacitors, high-voltage power capacitors, power filtering devices, and reactive power compensation equipment. The company provides capacitor products and power quality solutions for industrial and electrical applications.

2. Key Features and Advantages

Suitable for IGBT and Switching Circuits

Designed for integration into compatible IGBT circuits and switching equipment. The appropriate capacitance and voltage rating should be selected according to the switching topology and circuit requirements.

Multiple DC Voltage Options

Rated voltage options range from 600 V to 5000 V DC, supporting different power electronic circuit designs.

Flexible Capacitance Selection

Capacitance values from 0.1 μF to 6 μF are specified for the product range. Selection should consider transient voltage behavior, switching frequency, current stress, and the target circuit performance.

Broad Operating Temperature Range

The specified operating temperature range is -45°C to +85°C. Actual temperature limits depend on the selected model, electrical loading, installation conditions, and thermal design.

Multiple Construction Options

Plastic housing and Mylar tape constructions are specified. Dry-type and resin-potting options are also available within the product range, subject to the final configuration.

Long Expected Operating Life

The expected lifespan is specified as 100,000 hours under defined operating conditions. Actual service life depends on temperature, voltage stress, switching duty, and other application factors.

Application-Specific Selection

Voltage rating, capacitance, mounting method, insulation construction, and physical dimensions should be confirmed according to the circuit design and installation requirements.

3. Main Technical Specifications

Specification note: The above values represent the supplied product-range specifications. They do not necessarily apply to every model or voltage-capacitance combination. Confirm the complete datasheet before selecting the capacitor for a specific circuit.

4. Product Function and Operating Principle

In switching power electronics, rapid changes in current and circuit inductance can produce voltage transients. A suitably selected absorption capacitor can provide a path for transient energy and help manage voltage spikes when integrated into an appropriate circuit.

The effectiveness of the capacitor depends on its electrical characteristics and the overall circuit design. Important factors include capacitance, rated voltage, equivalent series resistance (ESR), equivalent series inductance (ESL), pulse current capability, switching frequency, and connection layout.

When selecting an Absorption Capacitor, engineers should verify the expected transient voltage, current waveform, energy per switching event, allowable temperature rise, and required service life. The rated voltage and capacitance alone are not sufficient to determine suitability for every IGBT or switching application.

5. Construction Options

Plastic Housing

A plastic housing may provide mechanical protection and help simplify installation, depending on the design. Confirm dimensions, mounting arrangements, terminal layout, and insulation requirements for the selected model.

Mylar Tape Construction

Mylar tape is specified as an available outer construction option. Confirm the product's mechanical protection, insulation characteristics, and suitability for the intended operating environment before installation.

Dry-Type Construction

Dry-type construction is specified within the product range. Confirm the applicable dielectric, thermal, and electrical performance parameters for the selected model.

Resin Potting

Resin potting is another specified construction option. Its suitability depends on the required insulation, environmental protection, heat dissipation, and mechanical conditions.

The availability of each construction method may vary by voltage and capacitance rating. Request the relevant technical drawing and datasheet before finalizing the design.

6. Applications

IGBT Power Electronic Circuits

Used in compatible IGBT-based power electronic systems where transient absorption or switching-related voltage control is required.

Switching Equipment

Suitable for selected switching circuits that require a capacitor with appropriate voltage, capacitance, and transient performance.

Power Conversion Systems

May be considered for compatible power conversion equipment, subject to verification of the electrical topology, switching conditions, and component ratings.

Industrial Power Electronics

Can be evaluated for industrial electrical equipment where the capacitor's specified voltage, capacitance, temperature range, and service-life requirements match the application.

Application note: The final circuit design should determine the capacitor's role and connection method. Do not assume that every model is suitable for every IGBT, inverter, converter, or switching circuit without checking its detailed electrical ratings.

7. Selection and Engineering Considerations

Before ordering, confirm the following requirements with the supplier:

1. Rated voltage: Specify the normal DC operating voltage and maximum expected transient voltage.

2. Capacitance: Define the required capacitance according to the circuit design and switching conditions.

3. Switching frequency: Provide the operating frequency and relevant switching waveform.

4. Current and transient stress: Specify peak current, pulse duration, transient energy, and expected repetition rate.

5. Electrical characteristics: Confirm ESR, ESL, dielectric performance, and any required pulse-current ratings.

6. Operating temperature: Verify ambient temperature and expected component temperature during operation.

7. Construction: Select plastic housing or Mylar tape, and confirm dry-type or resin-potting construction.

8. Installation: Provide required dimensions, terminal type, mounting method, and available installation space.

9. Service-life requirements: Confirm the expected operating hours and duty cycle.

10. Testing and compliance: Identify any applicable product standards, qualification tests, or documentation requirements.

Correct component selection and circuit layout are important for managing switching transients and maintaining reliable operation.

8. Quality and Reliability Considerations

The expected lifespan of 100,000 hours should be evaluated against the actual operating conditions. Voltage stress, switching frequency, current waveform, ambient temperature, cooling, and installation quality can affect capacitor performance and service life.

For critical power electronic applications, customers should request technical documentation covering rated voltage, capacitance tolerance, dielectric properties, allowable current, ESR, ESL, insulation performance, and applicable testing requirements.

Before production approval, confirm the model-specific datasheet, mechanical drawing, terminal configuration, operating limits, and acceptance criteria.

9. About Wuxi Power Filtering Co., Ltd.

Wuxi Power Filtering Co., Ltd., formerly the Power Filtering Research Institute of Wuxi Power Capacitor Co., Ltd., is a technology-driven enterprise specializing in capacitor technology, power filtering equipment, and reactive power compensation solutions. Following a shareholding reform in 1994, the company was officially established.

Its product portfolio includes power electronic capacitors, absorption and pulse capacitor products, self-healing high-voltage power capacitors, power filtering devices, and shunt capacitor compensation installations. The company also provides solutions for power quality management.

The company has a built-up area of approximately 20,000 square meters and operates a production base in Tongling, Anhui Province. It maintains collaborations with research institutions and universities in the development of capacitor technologies and related electrical equipment.

Recognized as a National High-Tech Enterprise and a Wuxi City Specialized, Sophisticated, and Innovative Enterprise, the company serves industrial and mining enterprises, power systems, rail transit, and other specialized sectors.

10. Frequently Asked Questions

Q1: What is an absorption capacitor used for?
It is used in suitable power electronic circuits to help manage switching-related voltage transients. Its exact function depends on the circuit topology and component selection.

Q2: What voltage ratings are available?
The supplied product range specifies rated DC voltages from 600 V to 5000 V. Confirm the available voltage and capacitance combinations with the manufacturer.

Q3: What capacitance range is available?
The specified capacitance range is 0.1–6 μF. The appropriate value depends on the circuit design and switching conditions.

Q4: What is the operating temperature range?
The specified range is -45°C to +85°C. Verify the applicable limits for the selected model and operating duty.

Q5: What construction options are available?
The supplied information lists plastic housing or Mylar tape, with dry-type and resin-potting construction options. Confirm the availability of each combination for the required rating.

Q6: What is the expected service life?
The specified expected lifespan is 100,000 hours. Actual service life depends on electrical stress, temperature, switching frequency, and installation conditions.

Q7: Can the capacitor be customized?
Discuss the required voltage, capacitance, dimensions, terminals, and construction with the supplier to confirm available configurations.

11. Ordering Information

For an accurate quotation and technical selection, please provide:

• Required rated DC voltage

• Required capacitance

• Circuit type and intended application

• Switching frequency and transient conditions

• Peak current or pulse-current requirements

• Operating temperature range

• Expected service life

• Housing and construction preferences

• Dimensions, mounting method, and terminal requirements

• Required datasheets, test reports, or qualification documents

Contact Wuxi Power Filtering Co., Ltd. to confirm the suitable model, technical specifications, and available construction options.

Choose the Absorption Capacitor for application-specific transient absorption requirements in compatible IGBT circuits and switching equipment.