SU1480055A1 - Dc voltage single-clock converter - Google Patents

Abstract

The invention relates to converter equipment and can be used in secondary power sources of radioelectronic equipment. The purpose of the invention is to increase the reliability of the converter by simplifying it. The converter contains a power transistor 1, a cumulative transformer 3 with a power winding 4, a positive feedback winding 5, a negative feedback winding 6, output windings 7, a voltage error amplifier 11, an overvoltage protection node 12, an inductor of saturation 16 with the main winding 17 and the control winding 18. The time during which the power transistor 1 is opened and energy is accumulated in the transformer 3 is determined by the saturation time of the throttles 16 on the main winding 17 from the voltage on the negative winding Feedback 6 of the transformer 3. The initial state of the droplets 16 is determined by the current in its winding 18 connected to the output of the error amplifier at voltage 11. When overvoltage is output, protection node 12 is triggered, which shorts the output winding 7 of transformer 3 by time direct cycle of operation, which reduces to zero the voltage of positive feedback and turns off the power transistor 1. 1 Cp f-ly, 1 ill.

Description

educator Pressing the button 7 drives the saturation of the throttles 16 under the influence of the autogeneration of the voltage applied to it of the inverter. Damping chain 6 increases. A power transiska consisting of elements 13-15 is designed to provide

Torus 1 remains in a saturated state for longer. The duration and ampliki 6 increases. Power transistor 1 remains in a saturated state for a longer time. The duration and amplitude of the current pulse through the power winding 4 increases. The amount of energy stored in the magnetic system per cycle increases, the voltages at the outputs + 5 V and ± 12 V increase, and the reduction of these voltages under the load is compensated.

The maximum maximum power value at the source output is characterized by the absence of current in the winding 18 of saturation throttles 16 and the greatest duration and amplitude of the current pulse through the power winding 4 of transformer 3.

Subsequent loading of the source according to any of the output voltages at a constant duration of the drive pulse of the converter increases the discharge time of the magnetic system to the load and reduces the output power of the source.

A short circuit on any of the converter outputs is characterized by the largest period of the pulse current of transistor 1, a significant decrease in the output power of the source, facilitating the mode of operation of the power transistor 1.

Exceeding the output voltage above the nominal, stabilized by a certain amount, previously set by the resistor 43, causes the transistor 45 of the overvoltage protection circuit to open. During the forward drive of the converter to the anode of the triac 46, a negative voltage is supplied through the diode 47 from the output winding 7 of the transformer 3. The triac shunts this winding to the + 5 V bus.

Thus, the number of elements of the device decreased, which reduced the cost of the source and increased its reliability.

Short circuit protection

output is provided by the properties of the Circuit-Detector O. Spesivykh

50

nii.

Compiled by I. Voitovich Tehred L. Serdyukova Proofreader I. Muska

0

five

0

five

0

five

0

five

We are a converter, which also significantly increases the reliability of the device.

Claims (1)

1. Single-ended DC-DC converter containing a power transistor, a start circuit, a storage transformer, the power winding of which is connected to the collector circuit of the power transistor, the positive feedback winding through the current-limiting resistor by connecting to the base of the power transistor , the output windings through the rectifying diodes and filters are connected to the output pins and to the amplifier for voltage, as well as the overvoltage protection node at the output, which is In order to improve the reliability of the converter by simplifying it, a resistor, a diode, a negative feedback winding of the storage transformer, and a saturation choke with the main winding and the control winding are inserted, the control winding is connected to the output of the voltage error amplifier, the start of the winding negative feedback is connected to the emitter of the power transistor, and the end is connected to one output of the main winding of the saturation throttle, the other output of which is connected via a diode to the base of the power transistor a and through a resistor - to the junction of resistor tokoogranichivayuschech- winding positive feedback. 20. The converter according to claim 1, characterized in that the overvoltage protection unit at the output is made on a triac whose cathode is connected to the output output of a stabilized voltage, the anode through a diode with an end winding of which transformer transformer, while the control transistor triac connected to the output of an overvoltage amplifier.