The best application of innovative capacitors in medical electronics
Capacitors are widely used in electronic medical devices to filter high and low frequency noise, as large-capacity energy storage devices, and for resonant and timing circuits.
Capacitor in switching power supply
In electronic medical devices, high-precision control and adjustment of the power supply is required to support the device to perform each function. Both AC and DC power supplies are widely used in these applications. Switching power supplies are used to control these power supplies, and because of their significant advantages, switching power supplies have become the standard power source for most electronic products.
Capacitors can be used to reduce ripple and absorb the noise generated by switching regulators. It can also be used for post-stage regulation to improve device stability and transient response. There should be no ripple noise or residual jitter in the power supply output. These circuits often use tantalum capacitors to reduce ripple, but tantalum capacitors can be affected by the noise of the switching regulator to create unsafe transients.
To ensure reliable operation, the rated voltage must be reduced. For example, a D-type tantalum capacitor rated at 10uF/35V should be operated down to 17V. If used to filter ripple at the input of the power supply, the rated 35V tantalum capacitor can operate reliably on voltage rails up to 17V.
High-voltage power bus systems are generally difficult to achieve a 50% reduction in rated voltage. This situation limits the use of tantalum capacitors for applications where the voltage rail is greater than 28V. Currently, since tantalum capacitors need to be derated, the only viable solution for high voltage filtering applications is to use larger, leaded electrolytic capacitors instead of tantalum capacitors.
New tantalum capacitor
To address the problem of reduced voltage ratings, Vishay's R&D department has developed a new series of SMD solid tantalum capacitors with higher voltage ratings, rated at 75WVDC. The use of 50V rated voltage capacitors in 28V and higher voltage rails has caused designers' concerns, and Vishay's new 63V and 75V tantalum capacitors are used to achieve industry-recognized safety ratings with a 50% reduction in rated voltage. The dielectric forming is thinner and more uniform, enabling the SMD solid tantalum capacitor to be rated at 75V, thus achieving a technological breakthrough in increasing the rated voltage. The multi-step process has been improved in the forming process: the mechanical stress concentration generated during the forming process is reduced, the local overheating of the electrolyte during the capacitor forming process is reduced, and the consistency of the electrolyte concentration and purity during the dielectric forming process is improved. The new capacitor T97 series is rated at 75V and the 83 series is up to 63V.
Face mask machine
Jiangsu Health Medical Technology Development Co., Ltd. , https://www.medicalhos.com