SU800985A1 - Stabilized dc voltage converter - Google Patents

Description

(54) STABILIZED CONSTANT CONVERTER

VOLTAGE

transistor and extreme terminals of the primary winding of the output transformer, and the secondary winding of the extreme leads connected to the bases of the transistors, and the middle terminal to the emitters and the other terminal of the power supply, the output rectifier and filter, introduced a master oscillator with adjustable frequency, feedback unit, additional a winding on an intermediate transformer, connected through a resistor to the output of the master oscillator, whose input is connected to the output filter through a feedback unit.

H drawing is a diagram of the proposed device.

The stabilized DC / DC converter contains a push-pull converter on transistors 1 and 2 with an output transformer 3. The primary windings 4 and 5 of the intermediate transformer b are connected between the collectors of the transistors and the outer terminals of the primary winding of the output transformer, and the secondary winding 7 by the outer leads is connected to the bases of transistors 1 and 2, and the average output to emitters. The additional winding 8 through the resistor 9 is connected to the master oscillator 10, which in turn through the feedback device. 11 is connected to an output filter 12 connected to an output rectifier 13.

The device will work as follows.

When the polarity of the rectangular impulse of the master oscillator is 10 emf at all windings of the intermediate transformer 6 is changed. no with . One of the transistors (1 or 2) opens, and the other remains behind. The current passing through the open transistor, as well as the primary winding 4 or 5 of the intermediate transformer connected to it, causes a proportional base current of this transistor due to positive current feedback. The output current of the master oscillator is close to zero. After some time has passed, the parameters of the intermediate transformer, it is saturated. The emf at all windings decreases to zero. The open transistor is locked. The output current of the master oscillator is increased. The intermediate transformer remains in the saturation state until the end of the pulse of the master oscillator. At this stage, a pause is formed in the form of pulses of the output transformer 3 of the converter. After changing polarity

the pulse of the master oscillator is unlocked by the transistor, which was closed in the previous half-period, and so on. The output power of the master oscillator is used only to maintain the intermediate transformer in the saturation state. The converted voltage is rectified by the output rectifier 13 and smoothed by the output filter 12. When the output voltage is changed, the output signal of the feedback device 11 and the frequency of the pulses of the master oscillator change, which in turn causes a change in the length of the pause between the output pulses

5 output transformer.

The present invention will allow the design of a stabilized voltage converter with optimal saturation of the converter transistors in a wide range of load currents and high efficiency.

Claims (2)

1. Aleksandrov, I.I., Sivakov, L.E. Pulsed semiconductor converters and voltage stabilizers. L., Energie, 1978, p. 23. iQ 2. USSR author's certificate No. 299916, cl. And 02 M 3/10, 26.02.71.