SU560216A1 - DC power supply - Google Patents

Description

The secondary windings 15 and 16 of the transformers through active-capacitive chains 17, 18 and 19, 20 are included in the basic circuits of transistors 9 and 10.

The control windings 21 and 22 of the transformers are included in the collector circuit of the transistor 23, which, together with the zener diode

24 performs the functions of a comparison unit. The switching of transistors 9 and 10 is produced through differentiating capacitors.

25 and 26 from master converter 27.

The scheme works as follows.

The negative pulse of the driver across the differentiating capacitor 25 unlocks the transistor 9, which connects the base of the transistor 1 through the resistance of the bias 7 to the minus of the power supply. The transistor 1 is connected, while simultaneously the supply voltage E through the emitter - the base of the transistor 1 and the transistor 9 is connected to the winding AND of the transformer 13. At the same time, there is a voltage on the winding 15 that keeps the transistor 9 in a saturated state for a time Magnetizing the core of the transformer 13 from the initial induction value B to the saturation induction BS. During this time, the power transistor 1 is also open.

When the core of the transformer 13 is saturated, the collector current of transistor 9 increases, transistor 9 goes out of saturation, the voltage across the coils I and 15 drops and an avalanche-like process of locking transistor 9 develops, during which it is kept locked by a capacitor 18 before arrival. through the operation of the master of the next unlocking negative pulse. The power transistor 1 is also locked by the bias voltage f / cM.

In the next half-period of operation of the master converter, the negative pulse through the capacitor 26 unlocks the transistor 10 and a process similar to the oppressed one occurs in a chain consisting of a transformer 14, a resistor 8 and a transistor 10. During this semi-transducer the transformer core 13 under the action of control current

is demagnetized to the initial induction value of Wo. The value of So will vary from / to.

When the voltage on the transistor changes

5 (t) with respect to a given value determined by the voltage f / on at the stabilizer 24, current / y, and therefore the value of So

changed in a way that supports

I-g at a given level.

Any rapid change of E in the interval

switching on the transistor 1 causes the open time of the power transistor 1 to also change in the same interval. Therefore, the U value in this interval does not change, i.e., the parametric adjustment channel is fast-acting. This makes it possible to reduce the level of pulsations Uf due to E pulses when working from a distance from 15 to 15 and increase the stability of the high current iTo ni source.

Claims (1)

Invention Formula A constant-voltage source, containing a switching voltage regulator, including a regulating transistor, a latitude 1 0-pulse modulator and a comparison unit, and connected via; 1, the input of the block is connected to it via a continuous compensating stabilizer. Comparison, characterized in that, in order to increase the stability of the output voltage, the specified impulse-impulse wave modulator transistors, the collectors of which through resistors are included in the base price of the regulating transistor, in parallel with these resistors are included the primary windings of two transformers, the secondary windings of which through active-capacitive chains, they are connected via a parallel base-emulator transition of transistors, the bases of which are connected through a differentiating capacitor to a master converter, and the control windings of these transformers are connected in series and connected between the output of the comparator and the power input of a pulse control stabilizer.