SU734859A1 - Stabilized dc-to-dc voltage converter - Google Patents

Description

I

The invention relates to the field of electrical engineering and may be referred to as a secondary power source for electronic equipment.

Stabilized DC-to-voltage converters are known with two stabilized outputs and the feedback in these converters is carried out from both outputs to one actuator.

However, a pulse-width modulator is used as an actuator in these converters, which is not always applicable in low-power converters, since it is more expedient to use a linear stabilizer (smaller weight and size parameters) in them.

The closest to the proposed invention in its technical essence is a converter, which contains a series-connected linear stabilizer, an auto-oscillator with an output transformer, to two secondary volumes, to whose pulses are connected, and between the output of one of the latter and the linear stabilizer input, a voltage divider is connected moreover, the bases of the transistors of the autogenerator are connected in the windings of the control zone of the reference zone.

The presence of negative feedback CBSJzi allows stabilization of the output voltage on the load on the output, but at the same time, the other output

10 remains unstabilized.

The difference in stabilization in the channels with feedback and without feedback is all the more increasing because the mutual influence of the aru channels on the circle has not been eliminated. When the load current at the stabilized output changes, this change, fulfilled by feedback, is also fed to the unstabilized output, as a result, the voltage cannot be set on it

20 with the required accuracy.

Claims (3)

The aim of the invention is to stabilize the current of the two outputs of the converter. To do this, convert a direct current, containing a series-connected stabilizer and an auto-generator with an output transformer, to each of the two outputs of which a direct-breaker is connected, one of which through a split-. The voltage of the voltage is connected to the control terminal of the stabilizer, the bases of the transistors of the auto-generator are connected to the control windings of the transformer, equipped with a second divider and switch, the second divider connected between the output of the second rectifier and the control input of the stabilizer, and the switch is connected to each output from the dividers, and the input to the windings of the control of the autogenerator. The switch is made on two transistors operating in the key mode, the collectors of which are connected to the connection of the shoulders of the corresponding divider, and an isolating diode, connected in series with the divider, is inserted into the circuit of each of them. The drawing shows the functional diagram of the Converter. The converter contains an autogenerator I, a rectifier 2, a stabilizer 3j and a voltage divider 4, and a switch 5. The converter operates as follows. The input stabilized voltage is fed to the input of the stabilizer 3, and then goes to the oscillator 1, from the output of which the sequence of square pulses goes to two rectifiers 2. From the output of each of the shkh, the rectified voltage is through dividers 4, which carry out the opposite feedback voltage, is sent to the stabilizer 3 and corrects the voltage of this stabilizer,. In this case, the correction of the voltage from the two outputs (out and out) to the stabilizers 2 does not occur simultaneously, but to the cycles, the duration of which is equal to half the period of the rectangular voltage of the generator 1. The connection of one or another divider 4 to the stabilizer 3 takes place during the cycle switch 5, which is controlled by a pulse sequence from the oscillator 1. Switch 3 is built on two transistors operating in a key mode, i. The transistor collectors are connected 5 to a common point of the divider arms, between which the decoupling diodes are connected in series to prevent their mutual shunting. The inputs of the transistors of the switch 5 (emitter-base) are connected to the base windings of the auto-oscillator 1. These inputs receive pulses of varying polarity, opening and closing (through the pop-g period) transistor, which shunts the corresponding divider 4. Thus , switch 5, bypass, respectively, then one, then another divider 4, provides feedback on each output. Stabilization is performed by cycles of half a voltage period of the autogenerator 1. Claim 1. Stabilized constant-voltage-to-constant converter containing a series-connected linear stabilizer and an autogenerator with an output transformer, two of the secondary windings of which are connected, are rectified, and between the output of one of the last and the input of the linear stabilizer includes a voltage divider, and the bases of the transistors of the oscillator are connected to the windings of the control of the transistor Informator, characterized in that, in order to improve the stabilization of the two outputs, it is equipped with a switch and a second voltage divider connected between the output of the rectifier and the control input of the stabilizer, the switch is connected to each of the dividers, and the input is connected to the control windings auto generator. 2. The converter according to claim 1, characterized in that the dividers are equipped with spreading diodes and the switch consists of two transistors, the collector of each of which is connected to the common point of the corresponding diode electrode and the splitter resistor. Sources of information taken into account during the examination 1. USSR author's certificate No. 551629, cl. O 05 F 1/64, 1975, 2. USSR author's certificate for application number 2493355 / O7, 1977. 3. Roaring E, M. TpaH3YicTopHbie Transducers in radio electronic equipment power supplies, M., Energie, 1975, p. 109, rice, 3-2.