How to Find a China DC Link Capacitor supplier?

Compare with 20 years ago, China’s capacitors technology become very mature. Many high end capacitors, like DC link film capacitors, hybrid tantalum capacitors, High Q MLCC can be produced by Chinese local manufacturers. Some good capacitors factory can supply similar quality as Kemet, AVX, Vishay, Epcos.

 

 

DC link film capacitors definition

 

DC link film capacitors is High Current DC Link Film Capacitors. The DC Link Capacitor is a part of power electronics found in inverters, converters, and motor drives. Although its primary function is to smooth out and steady direct current (DC) voltage, it also identifies any sudden jumps in voltage in the DC link circuit. As a result, this capacitor is similar to a steady bridge between the input (beginning) and output (end) of power electronic converters. In electric vehicles, the DC link capacitor protects the inverter circuit by absorbing sudden voltage increases.

 

The DC link capacitor is made to be strong and capable of holding a signification amount of energy. Given the ability to handle large changes in voltage and temperature, picking the right DC link capacitor is very important for the best performance and life of a system.

 

Why engineers want to use High Current DC Link Capacitor?

 

In power conversion, when AC is converted to low voltage DC, or AC from one frequency to another, the AC is usually rectified and smoothed. Once this is accomplished, the power is then routed to an inverter to obtain the final output. The DC that is fed into the inverter is called the DC link. As the name implies, the two sources are linked together with a filter capacitor

 

How DC link capacitors used in Electric Vehicles?

 

In electric vehicle applications, the DC link capacitor is used as a load-balancing energy storage device. The DC link capacitor is placed between the DC and the AC (which is the load side) of the voltage inverter. The capacitor is placed parallel to the battery, which maintains a solid voltage across the inverter. The device helps protect the inverter network from momentary voltage spikes, surges and EMI. The noise is the result of the pulsed inverter current and stray inductance on the DC bus

 

The importance of selection of a proper DC link film capacitors?

 

The selection of the proper DC link capacitor is important to achieve the proper performance of the system. For example, an under-designed DC link capacitor can cause a premature failure, or will cause EMI interference resulting in problems with other electronic circuitry. An over-designed DC link capacitor is not as cost- or size-efficient.

 

Help engineer to select a proper DC link film capacitors:

 

To select a proper film capacitor is very important to achieve the best voltage and current-carrying capability for DC link capacitors. The capacitor manufacturer can utilize various combinations of dielectric materials and terminations in the construction of each type of capacitor. That is why it is important for the designer to consider the following:

 

A. What is the nominal capacitance? Is the capacitance fixed or dependent on the ripple current?

B. What is the temperature range? What is the temperature profile?

C. What are the DC and AC ripple voltages?

D. What is the ripple current and frequency? Is the ripple current steady-state or intermittent?

E. What type of mounting and lead configuration is needed?

 

UF Capacitors has a variety of film capacitors. Their TDA Series is designed specifically for DC link applications which require long life under extreme operating conditions. TDA DC link film capacitors are widely used in EV power conversion, aircraft power systems, battery chargers and other high pulse circuit applications. Please contact China DC link film capacitors factory UF Capacitors for technical support or products selection. Custom designs are also available.

 

As one of the top 10 capacitors factory, UF Capacitors produce DC link film capacitors to replace Epcos DC link film capacitors. The size, performance are very similar to Epcos, while UF Capacitors can reduce lead time to 4 to 6 weeks. And they can help customer to cost down a lot.

 

 

Here list some common items for industrial power supply.

 

UF Capacitors Desription	UF Capacitors P/N	Competitor's P/N
Metallized polypropylene film capacitors (MKP) DC link  40uF 1100V +/-10% Bulk RoHS P: 52.5mm; P1: 20.3mm 4pin; LL: 5.5mm; d: 1.2mm 57*50*35mm; 100000 hours;	TDA3MK406M204HD5	B32778G0406+000
Metallized polypropylene film capacitors (MKP) DC link  30uF 800V +/-10% Bulk RoHS P: 37.5mm; P1：20.3mm ；4 pin;  LL:5.5mm; d:1.2mm; 42*45*30mm;  100000 hours	TDA2NK306K424KD5	B32776G8306+000
Metallized polypropylene film capacitors (MKP) DC link  14uF 1100V +/-10% Bulk RoHS P:37.5mm；P1:10.2mm； 4pin; LL: 5.5mm；d:1.2mm; 42.5*37*28mm; 100000 hours	TDA3MK146K374KB5	B32776G0146+000
Metallized polypropylene film capacitors (MKP) DC link 12uF 1100V +/-10% Bulk RoHS P: 37.5mm; P1:10.2mm ；4pin; LL:5.5mm 42*40*20mm; d:1.2mm 100000 hours	TDA3MK126K244KB5	B32776G0126K000
Metallized polypropylene film capacitors (MKP) DC link 20uF 1100V +/-10% Bulk RoHS P:37.5mm; P1: 20.3mm；4pin; LL: 5.5mm；d:1.2mm  42*45*30mm; 100000 hours	TDA3MK206K424KD5	B32776G0206K000
Metallized polypropylene film capacitors (MKP) DC link  5uF 1100V +/-5% Bulk RoHS P:27.5mm; 2pin; LL: 5.5mm; d: 0.8mm 32*29*19mm; 100000 hours	TDA3MJ505G332GL5	B32774D0505J000
Metallized polypropylene film capacitors (MKP) DC link  22uF 450V +/-10% Bulk RoHS P:27.5mm; 2pin; LL: 5.5mm；d：0.8mm  32*37*22mm; 100000 hours	TDA2WK226G402GL5	B32774D4226K000
Metallized polypropylene film capacitors (MKP) DC link 5uF 1100V +/-10% Bulk RoHS P:27.5mm; 2pin; LL: 5.5mm；d: 0.8mm 32*29*19mm; 100000 hours	TDA3MK505G332GL5	B32774D0505K000