High voltage aluminum capacitors for power electronics. Reference data

Encyclopedia of radio electronics and electrical engineering / Reference materials

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High-voltage electrolytic capacitors are used as components of filters in converter devices, among which the domestic aluminum capacitor K50-77 stands out.

In converter technology, developers use series (with insufficient operating voltage of the capacitor), parallel (to set the required capacity) or series-parallel connection of capacitors. The use of higher capacitance capacitors in a single package allows batteries to be made up of fewer capacitors and to reduce the number of additional equalizing resistors, chokes, etc. Thus, an optimal circuit design is achieved, weight and dimensions are reduced, the reliability of converter devices is increased, and as a result, the final cost of products is reduced.

Table 1

Today, the market for electronic components of power electronics offers aluminum electrolytic capacitors of both foreign and domestic production. The first in a series of Russian high-voltage aluminum capacitors was the K50-77 capacitor, designed to accumulate and store energy, smooth out ripples of direct and alternating currents.

Rice. 1. Overall dimensions of the K50-77 capacitor (1-Insulating cover; 2-Valve for explosion resistance; 3-Barrier for discharge.)

Structurally, the device is made in a cylindrical aluminum case with radially arranged screw terminals (Fig. 1). Fastening to the board is carried out using a clamp or end bolt. The end bolt version of the capacitor design is preferred for products that are subjected to increased mechanical loads, such as converters for railway vehicles.

The operating voltage of the capacitor is from 16 to 450 V; rated capacitance from 1000 to 100 microfarads; operating temperature range from -000 to 40°С; large amount of charge; high level of permissible current and voltage ripples per unit volume. The main parameters of the capacitor are given in Table 85.

Table 2

Rice. 2 Dependence of capacitance on temperature for a capacitor with a nominal value of 3300 uF and 400 V

Permissible values ​​of pulsating current are determined by the formula I_RO= I_R· K_t· K_f, where Kt is the coefficient of correction of the pulsating current relative to the value of I_R depending on the operating temperature (Table 2), and Kf is the coefficient of correction of the pulsating current relative to the value of I_R depending on the frequency (Table 3).

Table 3

Rice. Fig. 3. Dependence of total and internal resistance on temperature for a capacitor with a nominal value of 3300 μF and 400 V

The operating time of capacitors depends on the ambient temperature To and the current ripple coefficient, equal to K \uXNUMXd I / I_R (Table 4).

Table 4

Rice. 4. Dependence of total and internal resistances on frequency at T = 22-25 ^°С

A number of technical characteristics are presented in fig. 2-4. Currently, work is underway to improve the technical parameters, increase the allowable pulsating currents, expand the rating scale, and reduce the overall dimensions of the capacitor. Due to the promising direction of creating energy-saving devices, the K50-77 capacitor is in demand on the market and can satisfy the needs of various consumer groups.

Publication: cxem.net

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