Recently, Weirong Technology has jointly developed a new and unique C0G ceramic material with ceramic material suppliers, and has successfully developed resonant capacitors for high-power power supply that can be used in LLC resonant circuits, including 100V, 630V and 1000V series; Available in sizes 1206 and 1210, capacitances up to 100nF.
Resonant capacitors for high-power power supply can be widely used in wireless charging, automotive OBC, solar photovoltaic inverter and AI server power supply. Typical specifications are as follows:
1206-C0G-100nF-100V
1206-C0G-10nF-630V
1206-C0G-1nF-1000V
1210-C0G-10nF-1000V
1210-C0G-15nF-1000V
1210-C0G-22nF-1000V
1210-C0G-33nF-630V
With the widespread use of new energy, people are paying more and more attention to the conversion and efficient use of energy, and LLC resonant converters have become a hot topic in the field of power electronics because they can meet the demanding performance requirements of modern power supply design. Because higher switching frequencies (FSWs) can be achieved and switching losses are reduced, these switch-mode DC/DC power converters are typically used in high-power, high-efficiency applications. For example, for power supplies with power greater than 2KW, engineers generally give priority to this topology, such as on-board OBCs, chargers, solar microinverters, high-power wireless chargers, etc.
LLC resonant converters are based on resonators, in which inductors and capacitors oscillate at specific frequencies to produce resonant frequencies that efficiently convert DC voltage from one value to another. It generally consists of 4 parts: a power switch, a resonator, a transformer, and a diode rectifier (see figure below). First, the MOSFET power switch converts the input DC voltage into a high-frequency square wave. Then, the square wave enters the resonator, and the resonant groove eliminates the harmonics of the square wave, and outputs the fundamental sine wave. The sine wave is transmitted through a high-frequency transformer to the secondary stage of the converter, the voltage is turned up or down depending on the application, and finally the diode rectifier converts the sine wave into a stable DC output.
LLC converters are able to maintain high efficiency at very high power because of their resonant characteristics, and the core device is a capacitor with stable performance. In the traditional LLC circuit, a large number of cheap film capacitors are used, but with the increasing power of the required power supply, the current of the circuit is getting larger and higher, and the temperature is getting higher and higher, it is difficult for the film capacitor to adapt to the requirements of this working condition, so the engineer turned his attention to the ceramic capacitor with large flow capacity, higher temperature resistance and smaller volume, and the special C0G material resonant capacitor for high-power power supply is just suitable for this application trend.
The resonant capacitor for high-power power supply plays a vital role in reducing transmission loss and improving power transmission efficiency, and its key characteristics such as ESR, ripple-temperature rise and other parameters can achieve better performance than ordinary Class 2 porcelain, helping resonant circuits to achieve higher switching frequencies.
High-definition diagram of resonant capacitors for high-power power supply of micro-capacitance technology