SU591846A1 - Pulsed dc voltage stabilizer - Google Patents

Description

and the output to one of the inputs of the comparator, another input connected to the output of the sawtooth generator, the input connected to the forward output of the clock generator, the inverse output of which is connected to the counting input of the t-trigger, to the outputs of which go to the forward output clock pulse generator in pairs are connected to the clock pulse generator inputs, the inputs of the AND-OR-NOT logic block, the outputs connected to the trigger inputs, and the inputs of the T-flip-flop and the RS - trigger are connected in pairs Power amplifiers with transformer ones are connected to the output, bickey of which is connected to the base circuits of the two-stroke power converter transistors, and start-stop unit 4Л.

A disadvantage of this device is that on the windings of transformers of power amplifiers, when they are locked, a counter-emf occurs, as a result of which a switching pulse is applied to the bases of the transistors of the converter, which at this time were in the locked state. At the same time, the transistors that were at that moment in a saturated state because of the end time of locking continue to pass the collector current for some time. Thus, a through current of significant magnitude may occur, which significantly reduces the reliability of the operation of the power transistors of the power converter before they go out of order. The through-current mode in power converters assembled in a bridge circuit is especially dangerous.

The aim of the invention is to eliminate through currents and thereby increase the reliability of the stabilizer.

To achieve this goal, in a pulse voltage regulator containing a push-pull power converter on transistors, made according to a bridge circuit and connected through a low-pass filter and a resistor current sensor connected to the input of the unit for protection oi of emergency modes, to the output for connecting load connected to one of the inputs of the error amplifier, the other input of which is connected to the source of the reference voltage, and the output to one of the inputs of the comparator, the other one is connected yield of the sawtooth generator, an input connected to a direct output of the clock inverse output is connected to the count input of the T flip-flop, the outputs of which to forward the output of the clock inputs are connected pairwise logical block

AND-OR-NOT, the outputs connected to the RS-Trigger inputs, -And the outputs of the T-Trigger and YAZ-trigger trigger are the inputs of two power amplifiers g with Transformer outputs, each of which is connected to the base circuits of the transistors of the push-pull power converter, and a node start-stop, the new one is that the stabilizer is equipped with a logic block

10 matches, the inputs of which are connected to the outputs of the comparator, the emergency protection unit and the start-stop unit, and the outputs to the two inputs of the AND-OR-NOT logic unit.

5 Figure 1 shows a schematic diagram of a DC voltage stabilizer; in Fig.2, the timing diagram of the pulses at the output of the blocks of the stabilizer.

The power part of the pulse stabilizer circuit contains a push-pull power voltage converter on transistors 1-4, a transformer b, and a demodulator 6, which includes

S includes a low pass filter on the choke. 7 and the capacitor 8. The output voltage is applied to the load 9.

The control part consists of power amplifiers 10 and 11 with transformers 12, 13 at the output, windings 12i 13 and 12, 13 of which are included in the basic circuits of transistors 1-4, generator 14 clock pulses, inverse iI I I

whose course is connected to the input

trigger 15, control

part also

ewnmtiaOT T) € t -friMTT- n

Includes RS-trigger. 16, the inputs of which are connected to the outputs of the AND-OR-NOT 17 logic unit, the source of the reference voltage 18 connected to one of the inputs of the error amplifier 19, the output of which is connected to the input of the comparator 21 along with the output of the generator 20 of the comparator 21. Comparator output 21 and the output of block 22 for protection against emergency modes are connected to a matching logic unit 23, to the input of which is also connected to the actuator 24 of the start-up unit (which is not shown in the diagram). to the resistor current sensor 25.

Figure 2 presents the timing diagram of the pulses at the output of the blocks.

Claims (2)

stabilizer: 26 - generator 14 (direct output), 27 - T flip-flop 15 (direct output), 28 - logical block matching 23, 29 - logical block AND-OR-NOT 17 (first output), 30 logical block AND - OR - NOT 17 (second output), 31 - generator 20, 32 - comparator 21, 33 - R3 trigger 16 (inverse output), 34 - based on one of the power conversion transistors, for example 3. The stabilizer works as follows. In the normal (without accidents) mode from the outputs (22) and (24), the outputs (23) are signaled as logical: 1.I If the voltages are equal, the pilas and the error amplifier at time tj at the output of the comparator 21 teTCH is logical O, and the output of the match 23 block is logical i At this point, trigger 16 is switched and, as can be seen from the time diagrams, the control pulse duration on the transformer bases of the transistor; 3ovatel (3 or 4) .- tg is equal to the sawtooth voltage up to the moment of comparison. In emergency mode, the output (2 CONSTANTLY has a logical O and 23L output. As a result, the switching of the RS flip-flop 16 will occur almost simultaneously with the t-flip-flop 15. The amplifiers 10 and 11 and transformers 12 and 13 are chosen as so that the voltages on the base windings (12 and 13) have a phase shift similar to the signals in diagrams 27 and 33. Thus, in emergency mode, the phase voltage on the outputs (16 and 11) occurs so that the voltage on the windings ( 12 and 13) are out of phase, while the mode of operation The switches 10 and 11 and transformers 13, 12 do not change. The control circuit works when the contact (24) is opened (the stop mode), when logical O is applied to this input (23). The implementation of the proposed circuit and the test showed , that the reliability of the converter operation significantly increased while, without the introduction of a block of coincidence, there were many failures of the transistors of the power converter due to the occurrence of through-currents when the power amplifiers were turned on according to well-known circuits. Claims of an Inverter DC Voltage Stabilizer, which contains a push-pull transformer voltage sig- nal on transistors, is made according to a bridge circuit and connected through a low-pass filter and a resistor current sensor connected to the input terminal for connecting emergency signals to the output load connected to one of the inputs of the error amplifier, the other input of which is connected to the source of the reference voltage, and the output to one of the inputs of the comparator, the other input connected to you the saw generator voltage input connected to the forward output of the clock pulse generator, the inverse output of which is connected to the counting input T of the flip-flop, to the outputs of which and the forward output of the clock pulse generator the inputs of the AND-OR-logic block are connected in pairs to the outputs connected to the inputs of the RS trigger, and the outputs of the T-flip-flop and the RS-flip-flop are connected to the inputs of two power amplifiers with transformer outputs, each of which is connected to the basic circuits of the push-pull transistors i The first converter and the start-up node are equipped with the fact that, with the increased reliability of the stabilizer by eliminating the transistor current, the stabilizer is equipped with a matching logic unit, the inputs of which are connected to the outputs of the comparator, protection from emergency modes and the start-stop unit, and the outputs to the two inputs of the AND-OR-NOT logic unit. Sources of information taken into account during the examination: 1. Scheme of stabilization of the output voltage of a static constant voltage frequency converter or inverter. German Patent 1961705, cl. 21st 7/10, 1967. 2. Protection circuit ensuring smooth switching on of the pulse controller. US patent No. 3733540, CL 311-47, 1968.. 5. Stabilized voltage converter. USSR Author's Certificate no. 419873, cl. G 05 F 1/56, 1970. 4. A stabilizer with pulse width modulation. US patent 367Q234, cl. 321-18, 1970. FJVA ../ t-, l ...- jw / v I L. I