Medical capacitors in switching power supplies

In electronic medical devices, precise control and regulation of power supply is required to support the execution of every function. Both AC and DC power supplies are widely used in these applications. Switching power supplies are used to control these power supplies and have become the standard power supply for most electronic products due to their significant advantages.

Medical capacitor can be used to reduce ripple and absorb noise generated by switching regulators, and can also be used for post-regulation to improve the stability and transient response of the equipment. No ripple noise or residual jitter should be present in the power supply output. These circuits often use tantalum capacitors to reduce ripple, but tantalum capacitors may experience unsafe transient phenomena due to the noise from switching regulators.

New type of tantalum medical capacitor

To solve the problem of reducing rated voltage, the R&D department has developed a new series of solid tantalum capacitors with higher rated voltage levels. Thinner and more consistent dielectric formation makes it possible for solid tantalum capacitors to achieve a rated voltage of 75V, achieving a technological breakthrough in increasing rated voltage. Improvements have been made to multiple processes in the forming process: reducing the concentration of mechanical stress generated during forming, reducing local overheating of the electrolyte during capacitor formation, and improving the consistency of electrolyte concentration and purity during dielectric formation.

High voltage arc protection medical capacitor solution

These new devices have the maximum capacity within the higher rated voltage range and have improved tolerance to voltage breakdown. High voltage arc discharge can cause circuit interruption and may damage other components. Standard high voltage capacitors will eventually fail short-circuit, depending on the number of arc discharges and the problematic parts. Protective capacitors can absorb all the energy, so this medical capacitor can operate normally under high voltage, without destructive arc discharge at least before reaching the maximum voltage breakdown limit.

New non-magnetic medical capacitors for MRI

The capacitors and other electronic components used in the internal or peripheral circuits of magnetic resonance imaging (MRI) equipment need to be shielded or encapsulated outside the MRI room. The dielectric, electrode materials, or termination materials of the capacitors may contain ferromagnetic or magnetic materials. In order to improve image resolution, the magnetic field level of MRI systems continues to increase, and the capacitors used inside the MRI room can cause magnetic field distortion. Therefore, it is necessary to reduce or completely eliminate magnetic materials in most capacitors.

Non-ferrous materials are used in electrode and termination structures to meet the requirements of demagnetization. The manufacturer also uses a dedicated capacitor sorting device during final testing to ensure that all non-magnetic capacitors meet the technical requirements.