New energy vehicles refer to the use of non-conventional automotive fuels as a power source, and new energy vehicles include hybrid vehicles, pure electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, other new energy sources (e.g., high-efficiency energy storages, dimethyl ether) vehicles and other types of products.
Electric motors, batteries and motor control technology are the three major cores of new energy vehicles. The core of motor control technology is the need for high-efficiency motor control inverter technology, and high-efficiency motor control inverter technology requires a powerful IGBT module and a matching DC support capacitor.
Advantages of film capacitors
Early DC support film capacitors are used electrolytic capacitors, with the development of film capacitor technology, especially the base film itself technology development and metallisation using the split technology, not only makes the volume of film capacitors in the smaller and smaller at the same time, the product's withstand voltage level is also maintained at a fairly high level, and now more and more companies are using high temperature polypropylene film capacitors as DC support capacitors, a typical example is Toyota's RPF film capacitors, a typical example is Toyota's RPF film capacitors, a typical example is Toyota's RPF film capacitors. A typical example is the improvement of Toyota's RIUS model; while the typical representative of domestic car companies is BYD F3DM and E6, are using film capacitors as DC support capacitors. The first generation of Toyota Prius used filter capacitors are electrolytic capacitors, from the second generation, it began to use film filter capacitors DC-LINK capacitors instead.
A. Excellent product safety and overvoltage resistance
As film capacitors have self-healing amount of phenomenon, and film capacitors are designed in accordance with the standards of 1EC61071, capacitance surge voltage resistance is greater than the rated voltage of 1.5, coupled with capacitance using split-film technology, capacitance theoretically does not produce a short-circuit breakdown phenomenon, which greatly improves the safety of such capacitors, the typical mode of failure is an open-circuit. The ability of a capacitor to resist peak voltages in a particular application is also an important indicator for examining the capacitor. In fact, for electrolytic capacitors, the maximum surge voltage allowed to withstand is 1.2 times, this situation forces the user to have to consider the peak voltage rather than the nominal voltage.
B. Good temperature characteristics, product temperature using a wide range, can be from -40C-105C
DC support film capacitors using high temperature polypropylene film, with polyester film and electrolytic capacitors do not have the temperature stability, as the temperature rises, polypropylene film capacitor capacity overall is declining, but the proportion of the decline is very small, roughly 300PPM/C; and polyester film whether in the high temperature stage or in the low-temperature stage, the capacity of the capacity with the temperature change is a lot bigger, for +200~+ 600PPM/C.
C.Stable frequency characteristics, product high-frequency characteristics are good
Most of the current controller switching frequency in about 10K HZ, which requires products with good high-frequency performance, for electrolytic capacitors and polyester film capacitors, this requirement is a problem.
D.No polarity, can withstand reverse voltage
Film capacitors electrode is evaporated in the film on the nano-scale metal, the product is no polarity, so it is very convenient for the user, do not need to consider the positive and negative poles of the problem; and for electrolytic capacitors, if more than 1.5 times the Un reverse voltage is added to the electrolytic capacitor, it will cause a chemical reaction within the capacitor occurs. If this voltage lasts long enough, the capacitor will explode, or the electrolyte will flow out as the pressure inside the capacitor is released.
E. High voltage rating eliminates the need for series and balancing resistors
In order to increase the output power, there is a trend to increase the bus voltage in hybrid and fuel cell vehicles. Now on the market to the motor to provide the typical value of the battery voltage 280V, 330V and 480V, with the matching capacitor of different manufacturers is not quite the same - like, but generally will choose, for example, 450V, 600V, 800V, the capacity of 0.32mF to 2mF, and electrolytic capacitors are not higher than the rated voltage of 500V, so when the bus voltage is higher than 500V, the system can only be improved through the series connection of electrolytic capacitors. Therefore, when the bus voltage is higher than 500V, the system can only improve the voltage withstand level of the capacitor bank by connecting electrolytic capacitors in series. This not only increases the size and cost of the capacitor bank, but also increases the inductance and ESR in the circuit.
F. Low ESR, through the ability to withstand ripple current is strong
Film capacitors greater than 200mA / μF, electrolytic capacitors through the ripple current capability of 20mA / μF, this feature can greatly reduce the capacity of the capacitors required in the system.
G. Low ESL
The low inductance design of the inverter requires that its main component, the DC-Link capacitor, have extremely low inductance. High-performance DC-Link DC filter film capacitors minimise their self-inductance (30nH) by integrating the busbar into the capacitor module, greatly reducing the oscillating effect at the necessary switching frequency. Therefore, the absorption capacitance connected in parallel to the DC-Link capacitor_ is often omitted, and the capacitor electrodes are connected directly to the IGBT.
H. Strong inrush current resistance
Capable of withstanding instantaneous high currents, the use of wave slitting technology and capacitor coating and thick edge technology can improve the product surge current temperature and mechanical shock capacity.
J.Long service life
Film is not easy to age the characteristics of the film capacitors determine the excellent long life, especially in the rated voltage and rated temperature, the service life of more than 15,000-20,000 hours; if the average 30Km / H, then in the life of 450,000Km, the life of the capacitor for the car mileage is enough.
High-performance DC-LINK film capacitor is a kind of capacitor with new production process and metallised film technology, which increases the energy density of traditional film capacitor, i.e. the volume of capacitor is also reduced. On the other hand it meets the customer's flexible size requirements by integrating the capacitor core and busbar, which not only makes the entire inverter module more compact, but also greatly reduces the stray inductance in the application circuit, resulting in a better performance of the circuit function. Film capacitors are undoubtedly the choice for use as DC support capacitors in electric vehicles where the circuit design used in electric vehicles has high voltage,
high RMS current, overvoltage, reverse voltage, high peak current, and also long life requirements.
UF Capacitors is established since 1995 As one of the professional China Capacitor manufacturer in China, we are strong in complete management, strict quality control system, and excellent sales service. UF Capacitors supply high quality Capacitors ,help customers cost down 20%-50%.
UF Capacitors is an ISO9001-certified manufacturer in China, founded in 1995. We hold military qualifications for tantalum capacitors, MLCC, and other products. Additionally, we have a UL-recognized test laboratory located at our factory site.
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strong reputation.
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UF Capacitors |
ESPCOS/TDK |
KEMET |
VISHAY |
Panasonic |
Cornell Dubilier |
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THK,TDA High Performance Film Capacitors |
THK, TDA series |
B32778P Series |
C4AK Series |
MKP1848C Series |
EZPV Series |
BLH Series |
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