Abstract
As the demand for electric vehicles (EVs) continues to grow, the industry is shifting toward fast-charging systems to enable quicker battery charging. In response to this trend, Samsung Electro-Mechanics offers a 1210 inch, 22nF, 1000V MLCC CL32C223JIV1PN# designed to operate in high-voltage fast-charging systems within EV OBCs. This high-voltage, high-reliability product is specifically applied to AC-DC converters in EV OBCs, ensuring stable and efficient performance.
High-Voltage MLCCs Needed for EV OBCs to Support Fast Charging
The EV OBC (On-Board Charger) is a critical component that receives power from external chargers to charge the vehicle's battery, directly influencing the vehicle's driving performance and the charging capacity per session (Figure 1). Along with the LDC (Low Voltage DC-DC Converter) for 12V low voltage, the OBC handles power conversion functions together with components like converters, inverters, and batteries.
As previously described, there is a trend toward higher voltage and frequency within OBCs to increase charging speed. However, as the output of OBCs increases, internal heat generation issues may arise. To address these problems, high-voltage MLCCs are required.
[Figure1. Internal Structure of an EV OBC]
Resolving Heat Problems Through Resonant Circuit Design with C0G MLCCs
Previously, film capacitors (Film Cap) were used in OBCs. However, when high voltage is applied to achieve fast charging, it becomes difficult for film capacitors alone to handle the requirements, leading to heat issues. To address these heat problems, most OBC manufacturers have been designing high-efficiency resonant converter circuits (LLC) to improve power transmission efficiency. (Figure 2)
[Figure2. Advantages of Resonant Circuit Design]
The C0G MLCCs used in these circuits provide higher reliability in high-temperature and high-frequency environments compared to film capacitors, while also offering lower ESR. (Figure 3)
C0G MLCC, Film Cap의 High Capacitance, Temperature, Frequency Characteristics, Size, Low ESR에 대한 정보를 제공합니다. | High Capacitance | Temperature | Frequency Characteristics | Size | Low ESR |
|---|
| MLCC(C0G) | ○ | ◎ | ◎ | ◎ | ◎ |
Film Cap | ◎ | ◎ | ○ | ○ | ○ |
[Figure3. C0G MLCC vs Film Cap]
Improved Space Efficiency and Reduced Load with the Adoption of High-Voltage C0G MLCCs
Using high-voltage C0G MLCCs can reduce both the quantity and mounting area of capacitors in comparison to using film capacitors or standard C0G MLCCs, thus improving space efficiency. As shown in Figure 4 below,
① Replacing film capacitors with standard C0G MLCCs ensures the quantity while reducing the required mounting area.
② If film capacitors are replaced with high-voltage (1000V) C0G MLCCs, both the quantity and mounting area can be decreased.
However, in such cases, it is necessary to check the temperature rise (self-heating) according to the rated voltage and current of the MLCCs prior to the creation of the circuit design.
Film, C0G MLCC, High-Voltage C0G MLCC의 Capacitance(nF), Composition(Total Quantity), Total Capacitance(nF), Rated Voltage, Size(mm), Total area(mm²)에 대한 정보를 제공합니다.Category | Film Cap | ① C0G MLCC | ② High-Voltage C0G MLCC |
|---|
Capacitance (nF) | 22 | 22 | 22 |
Composition (Total Quantity) | 2s10p (20pcs) | 2s10p (20pcs) | 1s5p (5pcs) |
Total Capacitance (nF) | 110 | 110 | 110 |
Rated Voltage | 600V | 630V | 1000V |
| Size (mm) | 18 × 13 | 3.2 × 2.5 | 3.2 × 2.5 |
Total area (mm²) | 4,680 | 160 | 40 |
[Figure4. Comparison between Film Cap/C0G MLCC/High-Voltage C0G MLCC]
Samsung Electro-Mechanics 1210 inch, 22nF, 1000V Solution
The 1000V high-voltage, 1210 inch, 22nF, C0G MLCC CL32C223JIV1PN# is introduced in this Technical Article. Samsung Electro-Mechanics has incorporated voltage distribution safety designs and proprietary raw material development technologies to address internal heat issues during high-speed charging. This enables a stable operation even under high-voltage environments.
The datasheet can be downloaded from the Samsung Electro-Mechanics website.
Additionally, the company offers a diverse lineup of 1206-inch products and plans to mass-produce a 1210-inch, 33nF product with a maximum voltage of 1000V in 2025. (Figure 5).
Product Lineup
Mass Production Under Development
10pF~33nF까지의 전압을 가진 0603 inch, 0805 inch, 1206 inch, 1210 inch 라인업 정보를 제공합니다.Size inch (mm) | Capacitance |
|---|
10pF | 22pF | 47pF | 100pF | 220pF | 470pF | 1nF | 2.2nF | 4.7nF | 10nF | 22nF | 33nF |
0603 (1608) | 250V | 250V | 250V | 250V | 250V | 250V | 250V | | | | | |
0805 (2012) | 630V | 630V | 630V | 630V | 630V | 630V | 630V | 630V | 250V | | | |
1206 (3216) | 1000V | 1000V | 1000V | 1000V | 1000V | 1000V | 1000V | 630V | 630V | 630V | 250V | 250 |
1210 (3225) | | | | | | | 1500V (1.2nF) | | | 1250V | 1000V | 1000V |
| 630V |
[Figure5. High-Voltage C0G MLCC Lineup]
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