SU1418679A2 - Pulsed d.c. voltage stabilizer - Google Patents

Abstract

The invention relates to electrical engineering, in particular to secondary power sources. The purpose of the invention is to improve the weight and size parameters and expand the scope of application of the stabilizer. If the stabilizer load current does not exceed the allowable level, which is selected by the additional resistor 5, the pulse signals from the control unit 10 are sent to the base of the auxiliary transistor 8. The control transistor 1 is open and a constant voltage appears at the output of the LCD filter 2, the pulsations of which are smoothed by the RC filter 3. With an increase in the load current of the stabilizer above a certain level, which is determined by the resistive current sensor 4, which is simultaneously the battery of the RC filter 3, saturation mode, the first protective transistor 6 and the second protective transistor 7, and the regulating transistor 1 - cutoff mode. The use of an additional RC filter 3 in the stabilizer leads to a decrease in size and weight due to a decrease in the capacitance of capacitors of the LCD filter 2 and RC filter 3. Due to the decrease in the volume and mass of the filter, the proposed stabilizer can be used to power out measuring devices. 4 il. SS (L

Description

J - ij

 r-j - .... "J

n

four

00

O5

WITH

ISJ

The invention, in retrospect for electrical engineering, can be used in the design of secondary sources of injection, and is an improvement of the device according to autor.N 1056166.

The purpose of the invention is to improve the overall dimensions and the wide range of applications.

I Pa FIG. 1 shows a diagram of an immobile stabilizer of constant Lok in FIG. 2 shows the diagrams of the stress {{niy-, in FIG. 3 and 4 - filter schemes. The stabilizer contains a regulating transistor 1, successively connected to the power line, an LCD filter, 12, an RC filter 3, the capacitor of which is connected to the output of the output, in the RC filter element a resistive sensor A current, one of the terminals of which is connected to the output 1 output and through an additional resistor: 5 to the base of the first protective transistor 6; Another output of the sensor 4 is connected to the output of the LCD filter 2 and through the emitter-collector junction of the first protective transistor and 6 and the second additional resistor to the base of the second protective tr anzistor 7, the collector of which is connected to the base of the auxiliary transistor 8, the collector of which through the first resistor 9 is connected to the base of the regulating transistor 1.

The base of the auxiliary transistor 8 is connected to the first output of the control unit 10 (which can be performed, for example, on a 142EP1 type chip), and the emitter through the collector-emitter junction of the third protective transistor 11 is connected to the emitter of the second protective transistor 7 and the second output terminal. Parallel to the collector-emitter junction of the third protective transistor 11, a second resistor 12 and a capacitor 13 are connected, the input of the control unit 10 is connected to the output pins, and the second output is connected to the base of the third protective transistor 11 ..

The stabilizer works as follows.

If the stabilizer load current does not exceed the allowable level, which is produced by resistor 5, the pulse signals from the control unit 10 are sent to the base of the auxiliary transistor 8, and the output of the LCD filter 2 P (5np11 is a constant voltage with a certain ripple value. Ripple voltage the wives are finally smoothed by the RC filter,

When the stabilizer load current increases above a certain level, which is determined by the resistive current sensor 4, which is 1ms at the same time an element of the RC filter, the first 6 and second 7 fast transistors go into saturation mode, and the control transistor 1 becomes cut off. In this way, the stabilizer is operated in current limiting mode.

Fig. 2 o & are voltage diagrams at the input U and at the output U, of the stabilizer filters,

LCD filter Dfig. 3) built according to a well-known scheme with a droplet inductance L, a capacitor with a capacitor C and a resistive current sensor R. Figure 4 shows the proposed two-link filter circuit. The first link of such a filter is the LC2D filter and the second, RC, is a filter whose resistor R is also used as a current sensor.

With the same filter voltages, load currents, filtration degrees, and the same inductance, the dimensions and mass of the filter (Fig 4) are smaller compared to the mass and dimensions of the filter (Fig 3).

The filtration coefficient KF, the filter of FIG. 3 is equal to

Cf, u) 2LCi - 1,

(one)

where to is the circular frequency of the first harmonic of the operating frequency. For the filter of FIG. 4, the filtratgin coefficient Kf is equal to

Kf.5 (- 1) S RCj, (2)

where l is l 1. Lj

By the condition of the problem

(CT -1) (() u), (3)

where KF - the filtration coefficient specified in advance. From (3) determine

with, Iri-St.

wX

(four)

where X is UL.

Exodus from physical considerations

always --- 1, K 1.

Then the expression (5) takes the form j

(6)

G I- v-1-J- -K g - 2YX - sX Y R F

The second value of capacitance C has no physical meaning (C 0), therefore

C, -j - (0.5.f | -).

Since, ceteris paribus, the dimensions and mass of the filter are determined by the total capacitance of the capacitors, we prove inequality 20

j

YU

15

20

which is a true inequality, which is always practiced.

When using the invention, the cost of the filter is reduced by 1.5 times, and the mass and volume - 1.4 times.

The proposed stabilizer due to a decrease in the volume and mass of the filter can be used to power the measuring and computing devices, the power supply design and dimensions are determined by state standard. Thus, the proposed technical solution allows to expand the scope of application of the stabilizer.

Claims (1)

Invention Formula C, 7 2C,. From (4) and (8) we have which is tantamount to inequality  KF K.  . 25 DC impulse stabilizer auth. St. No. 1056166, о. T is characterized in that, in order to improve the weight and size parameters and expand the scope of application, a capacitor is inserted into it, which is connected to the output pins and, together with a resistive current sensor, is an RC filter. , 2 . FC2L