SU1702502A1 - Controllable voltage transducer - Google Patents

Abstract

The invention refers 1 to an electric one, on the spot, and can be used in automation systems and telemechanics of the service / under the influence of 1 intermix. The purpose of the invention is to increase the reliability of the converter by ensuring the stability of the control voltage when it is started. at the output of the intensifier 9 there is no transistor 7 and the elements 5 b are closed. The supply voltage and interference in the control circuit to the power transistors do not propagate. If there is a voltage control signal at the output of the int. nsimeme-rc 9 will be filled in and, having reached a certain threshold-ge level, they open 5/6, which pass paraflashypl-mly to the bases of the power transistors 1 2 In addition, the trinchistor opens, which completely opens the bps-communications link of the power transistors & вып rectifier and resistor on the base of the transistor 7 3 or

Description

The invention relates to electrical engineering and can be used in automation and telemechanics systems, which are subject to electrical conditions.

The purpose of the invention is to increase the stability of the LOMRUO transform

Fig 1 shows the cxLMa of the proposed device, at phi 2 g - og "intensity meter, located on the type of diode beaker, fig 3 we

The converter contains high-power transistors 1 and 2, transformer 3 trigger 4 circuits, And 5 and 6 add / 1 whose transistor 7, rectifier P HI en iweip 9 diode 10, current | animating | and resistor 11

Intensimeter contains dosing 12 and on the gross l 13 v nd l lor i 41 o

d i4 and 15 agreed to the cascade on the field transition (torus 1b

The control signal bus Uynp is connected to the trigger input of trigger 4 and to the input of the intensity meter 9. The outputs of trigger 4 are connected to the first inputs of the AND elements

5 and 6 made with an open collector B, the high-voltage inputs of elements 5 and 5 are connected to the output of the intensity meter 9 Anode l 10 is connected to the output of the intensity meter 0, - - to the transistor 7 b, the collector is connected to the input constant bus UBX 3 with medium Hi i primary point Trvncd opMdTopa 3 Element Outputs I 5 and

6connected to the bases of transistors 1 and 2, the zmitteoi which are connected to the common bus and the collector is connected to the anodes O

YU

ate about go

A single output 8. An output through a current — an amplifying resistor 11 is connected to the base of a transistor 7.

The converter worked g as follows

L the initial state of the circuit receives a signal UBX, and the regulated control signal is absent (Phon Za). Despite the presence of signal interference, there is no signal at the output of the Ethernet 9 (FIG. Ze), while And 5 and 6 and power transistors 1 and 2 Signal / Yuv interference and control circuit on the power of the power bodies are excluded. Lack n- zhenig etc. in the base circuit of the transistor T 7 obespechirl its closed state, and sledovat vioho, supply voltage to the transistors 1 and 2 is not fed. This prevents the penetration of interference from the power supply circuits of the sieve part of the converter into the secondary winding of the transformer mount 3 through the interwinding capacity. In addition, the self-excitation of the converter amplifier is completely exhausted.

When a regulated signal (Fig. 36) appears on the storage capacitor 14 of the multimeter 9, the voltage begins to increase in portions determined by the capacity of the metering capacitor 13 (Fig. 3g). When the voltage at the output of the intensimeter reaches the threshold of opening the elements And 5 and 6, the latter begin to pass paraffz control signals from the shoulders of the trigger 4 into the basic circuits of transistors 1, 2 and 7. In addition, the output signal of the intensimeter 9 i. Toanzistooa 7 base, included according to the emitter scheme according to the second /: Transistor 7 opens, and a voltage appears in its emitter circuit, powering the power section of the converter.

Due to the self-induced EMF arising in the primary half-transformer 3 when switching 1 transistors 1 and 2, the voltage at the input of the rectifier 8 has double the voltage compared to the voltage of the emitter circuit of the transistor 7. This voltage through the rectifier 8 and current limit the driving resistor 11 is applied to the base of the transistor 7, leading to its further

opening and increasing the voltage of the power supply (Fig. Fig.), as well as the locking of the diode 10. This process develops to the full transistor of the transistor 7. For

To ensure a smooth start-up of the start-up circuit, a capacitor 17 can be connected to the base circuit of the transistor 7, as it is charged, the opening of the transistor 7 increases.

power circuits of the transducer low-power transistors with a more complete use of their current.

Thus, to start the conversion, it requires the presence of a regulated signal yi of the Uynp directive. Interference signals in the form of single pulses or a sequence of pulses of shorter duration do not cause the appearance of an unauthorized negative output voltage.

Claims (1)

Claims of the Invention A controlled voltage converter containing two power transistors, the emitters of which are connected to a common terminal, a transformer with a midpoint of the primary winding, which is connected to the collectors of the transistors as well as a trigger and two two-input logic element I. The outputs of which are connected to the bases of the corresponding power transistors, and the first inputs are connected to the outputs of the trigger, the input of which is connected to the output of the control signal source, characterized in that, with an immunity circuit at its startup, an intensity meter is introduced . additional transistor rectifier, resistor and diode, while the base of the additional transistor is connected through a resistor to the output of the rectifier, whose inputs are connected to the collectors of the power transistors, the collector is supplemented A transistor is connected to the input voltage source and the emitter to the midpoint of the primary winding of the Transformer, the input of the voltage meter is connected to the output of the control signal source, and its output is connected to the second inputs of the logic elements And through the diode with the base of the additional transistor, -W -Va