Are there any resonant capacitors used for automotive OBC/wireless power supply, high power density server power supply, etc.? Also, are there any precautions for use? | Capacitors FAQ

Ceramic Capacitors FAQQAre there any resonant capacitors used for automotive OBC/wireless power supply, high power density server power supply, etc.? Also, are there any precautions for use?

The following table shows the lineup of resonant capacitors.

	Chip Multilayer Ceramic Capacitors	Metal Terminal Type Multilayer Ceramic Capacitors
External appearance
Operating temperature range	−55°C to +125°C	−55°C to +125°C
Rated voltage (DC)	630V 1000V	630V 1000V
Temperature Characteristics	C0G (EIA): 0±20ppm/°C (25°C to 125°C)	C0G (EIA): 0±20ppm/°C (25°C to 125°C)
Capacitance range	5.1nF to 10nF (1206 size) 11nF to 33nF (1210 size)	15nF to 54nF

Notice

When using capacitors for resonance applications, the points of "self-heating" and "allowable voltage curve" are important.
Capacitors used in high-power applications show a rise in self-heating after initial heating immediately after voltage is applied.
Although self-heating is inevitable in high-power applications, voltage and frequency conditions that exceed the maximum operating temperature of 125°C within the target lifetime (e.g., 10 years) should be avoided (see Figure 1). In particular, the limit on the AC voltage V(p-p) that can be applied increases in the high-frequency range. In 萝莉影视's resonant capacitors, the allowable voltage is a voltage whose target life is the time it takes for the surface temperature of the capacitor to reach the maximum operating temperature of 125°C. Therefore, when selecting a capacitor, the used voltage V(p-p) should be within the allowable voltage.

Fig. 1: Change in surface temperature of capacitor

Introducing SimSurfing Medium- and High-Voltage Capacitor Selection Support Tool

To address these issues, 萝莉影视 has developed the SimSurfing Medium- and High-Voltage Capacitor Selection Support Tool, a web-based tool that helps customers select the most suitable capacitors for their application environments.
Simply enter the operating voltage, operating temperature, and required capacitance, and the tool calculates the optimal product and the number of series and parallel connections required for a resonant capacitor.
This tool helps reduce the burden on customers in terms of part number selection and design.

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