English

Medical power supply filter products and applications

The strict requirements for

medical power supply filters

In the modern medical environment, the stability and security of electronic devices are directly related to the life and health of patients.

Medical equipment has extremely strict requirements for the purity of the power supply. As a key component for suppressing electromagnetic interference (EMI), power filters play a crucial role in ensuring the reliable operation of medical equipment and the safety of patients and medical staff. This also determines that the design standards for power filters are more stringent.

1.Extremely high security and reliability

Equipment failure may lead to diagnostic errors and directly or indirectly endanger patients' lives. Filters must ensure effective operation under any circumstances (such as power grid fluctuations, lightning surges, and interference from other equipment), and must not become a weak link in system reliability.

2. Strict leakage current limit

This is one of the most crucial considerations for medical devices. As the devices will come into direct or indirect contact with patients, the current that leaks from the power line through the filter to the device's casing or signal terminals must be controlled at an extremely low level to prevent the risk of microshock, especially for those devices intended to be connected to the heart.

Earth leakage current: It is usually required to be below 300 µA, or even lower (such as 100 µA).

Patient leakage current: More stringent requirements are imposed, which can be as low as below 10 µA.

3. Strong electromagnetic compatibility performance

Medical equipment is both a "sensitive device" and an "emitter" in terms of EMC.

Interference resistance: The equipment must be capable of resisting disturbances from the power grid (such as fast transient bursts, surges, and voltage sags) to ensure it does not malfunction. Filters play a crucial protective role in this regard.

Launch control: The electromagnetic noise generated by the equipment itself must not be conducted out through the power line, nor can it interfere with other sensitive devices (such as monitors, electrocardiographs, etc.) on the same power grid. The filter must suppress these noises.

Standards and Regulations for Medical Power

Supply Filters

The following standards are usually referred to or adopted by the regulations of various countries and serve as the basis for design and testing.

Global/Basic:
Core Safety Standard: IEC 60601-1
Core EMC Standard: IEC 60601-1-2
Key regulatory points: Ground leakage current, insulation, and EMC performance

China:
Core safety standard: GB 9706.1 (Compulsory)
Core EMC standard: YY 9706.102 (mandatory)
Key regulatory points: Ground leakage current, insulation, and EMC performance.

North America:
Core safety standards: UL 60601-1 / CSA C22.2 No. 60601-1
Core EMC standards: FCC Part 15 Subpart B, CISPR 1
Key regulatory points: FDA market approval, the filter must have UL/cUL marks.

Europe:
Core safety standard: EN 60601-1
Core EMC standard: EN 60601-1-2
Key regulatory points: CE marking, compliance with MDR regulations, and review by a notified body.

Selection and Application Suggestions 1

Socket-type filter

Application: Medical power supply, medical monitoring system
Uninterruptible power supply system, anesthesia machine, ventilator

General-purpose medical force gauge: 1A - 15A

Medical Ultra-Efficient Type: 20A

Selection and Application Suggestions 2

Modular filter

Application: Monitoring systems, medical power supplies
Medical imaging equipment and biochemical analyzers

Medical Slim Type: 1A - 10A

Medical Mini Version: 1A - 10A

Selection and Application Suggestions 3

Single-phase filter

Application: Electrocardiograph, high-frequency electrosurgical unit,
Medical instruments (not for body connection), medical scales

General-purpose medical force gauge: 1A - 30A

Medical DIN Rails: 1A - 30A

The product line of High&Low is comprehensive, covering various styles from plug-in, modular to single-phase.

The current range is from 1A to 30A, which can meet the electromagnetic safety requirements of various medical scenarios, from large imaging equipment to portable monitors, providing a solid guarantee for the equipment to pass certification and operate safely and stably.