Physical meaning of non-inductive capacitance

inductance

The physical meaning of the non-inductive capacitor is mainly that the winding process of the capacitor is a non-inductive winding structure (relatively, there is an inductive winding structure), in fact, the non-inductive capacitor is not without inductance, but the inductance is small, for high In the frequency of the capacitor, we emphasize no sense. In fact, the inductance is small. From this point of view, almost all metallized film capacitors are non-inductive capacitors.
However, in general, the non-inductive capacitor mainly refers to the surge absorption capacitor used for IBGT protection. It is a non-inductive structure. If used to prevent grid surges, of course, it is too wasteful.
The characteristic of the non-inductive capacitor is that the du/dt value is relatively large, that is, the pulse current capability is very strong.
Non-inductive capacitor is a kind of capacitor used in high-frequency circuit. This capacitor has no pin or short pin and is often used for high frequency head. Generally, it is PF grade. The so-called "no sense" means that the capacitor does not produce "inductance". Effect, because C (capacitance) + L (inductance) = R (resistance), (when the match is good), if so, the circuit will not work.

Non-inductive capacitor products
MPA series non-inductive capacitors, characteristics and uses:
1. The polypropylene film is used as the medium, and the cylindrical core is internally connected into a series structure by a special electrode, and the core is wrapped with a plastic tape, and the two ends are packaged with a flame retardant epoxy resin.
2. It has the characteristics of small self-inductance, low equivalent series resistance, low loss, high insulation resistance, good frequency characteristics and ability to withstand high voltage and high current impact.
3. Mainly used in high voltage, high current and high pulse circuits, such as buffers, energy converters, switching power supplies, inverters and inverters, especially for IGBT, thyristor, Darlington Used as absorption capacitor in the line.

Second, the main parameters:
1. Ambient temperature -40 °C - +70 °C
2. Capacity deviation: ±10% (K), ±5% (J)
3. Rated DC voltage (VRDC): 630 1200 1600 2000 2500 3000VDC
Rated AC voltage (VRAC): 380 500 630 660 700 750 VAC
DC surge voltage (VPKDC) 2400 3000 3500VDC;
4. Experimental voltage: 1.5 V RDC 10S @25 °C between lead and lead; 2KV AC 60S @25 °C between lead and case
5. Inherent inductance: ≤ 1Nh/mm (including capacitor length and lead length);
6. Loss tangent: CR ≤ 1.5 μF tg ≤ 5 × 10 -4 (1KHZ measurement); CR > 1.5 μF tg ≤ 8 × 10 -4 (1KHZ measurement)
7. Insulation resistance: τ≥ 30000S 30GΩ (60S, 100 V DC measurement)
8. Capacity stability: -4% (30000 hours at rated DC voltage).