SU1644320A1 - Dc voltage supply - Google Patents

Abstract

The invention relates to converter technology and can be used as a secondary power supply of a key type. The purpose of the invention is to increase reliability by reducing the duration of the process of turning on the device by introducing a high-speed control of the load. The device contains a key converter 1. connected to the control unit 2, a threshold device 3 connected in series, a differentiation circuit 4, a single vibrator 5, the primary winding of a current transformer 6, a threshold element 8, an AND 9 circuit and a trigger 10, an output connected to the off input of the control unit 2. The supply terminal of the control unit 2 is connected to the output of the threshold device 3, the output of the single-vibrator is connected to the second input of the circuit AND 9, the end of the primary winding of the current transformer 6 is connected to the measuring resis yell 7 and obmotcha secondary current of the transformer 6 is connected between the output of the key converter 1 and the load. 2 Il. Si

Description

О OE N3

FIG. one

The invention relates to converter technology and can be used as a secondary power source of a key type.

The aim of the invention is to increase reliability by reducing the duration of the process of turning on the device by introducing a high-speed control of the load.

FIG. 1 shows a functional diagram; in fig. 2 - diagrams explaining the principle of action.

The constant voltage source (Fig. 1) contains a key voltage converter 1, a control input connected to the output of control unit 2, a threshold device 3, an input connected to input terminals, and an output connected to input of a differentiating circuit 4, the output of which is connected to the input of the one-shot 5, the output connected to the circuit containing serially connected primary winding of the current transformer 6 and the measuring resistor 7 and the first input of the circuit 9, the second input of which is connected through the threshold element 8 to the point It connects the primary winding of the current transformer 6 and the resistor 7, the secondary winding of the current transformer 6 is connected in series with the load circuit, and the output of the circuit 9 is connected to the trigger input 10, the output of the control unit 2 connected to the off input.

The source works as follows.

When it is connected to the primary voltage source C / I (Fig. 1), the input voltage of the threshold device 3 and the power terminals increases as the blocking capacitors charge (Fig. 2a, O ... / i). When the voltage t / in reaches the set threshold value f / then i (time i), the threshold device 3 is activated and supplies power to the control unit 2. In this case, a voltage jump (Fig. 26) is formed at the input of the differentiating circuit 4, and as a result of differentiation a signal is obtained (Fig. 2c). Using a differentiated signal, start a single vibrator 5, the output of which forms a rectangular voltage pulse of a given duration t (Fig. 2d), fed to one of the inputs of the circuit 9 and the circuit of the primary current transformer 6 and the resistor 7 connected in series.

At the same time, a voltage pulse is formed at the input of the threshold element 8 (Fig. 2d), the amplitude of which is determined by the ratio of the resistance K c to the primary winding of the resistance K c and the resistance of the resistor 7. If RH is less than the nominal (# n

 a) the amplitude of this pulse exceeds the triggering level of element 8 (t / break), the output of which and the second input of circuit AND 9 is at the logic level "1

(Fig. 2 e). At the output of the AND 9 circuit, the logical "1" level (Fig. 2 g) also acts, which transfers the trigger 10 to the state at which a signal is generated at its output (Fig. 2 h), which turns off the control block 2. This ensures that the active devices of the load are switched off and, accordingly, exclude their overload directly from the moment of switching on.

When the source is switched on (moment / 2, fig. 2 a) with a load resistance corresponding to the absence of an overload (R Rt nom), the signals at the output of blocks 3-5 retain their shape (Fig. 2 b-d), however, the voltage amplitude the inlet of element 8 is insufficient for its immediate response (Fig. 2 d). The signals at the outputs of blocks 8-10 at the same time maintain the logic level "O (Fig. 2 e-3) and the control unit 2 generates a control signal for the active devices of the converter. After 5 switching on the current transformer 6 is saturated and does not affect the operation of the circuit in the future.

In the proposed device, at the stage of monitoring the load state, the output capacitor of the filter of the active devices 0 load (C, Fig. 1) is not connected in parallel with the load, as is the case in the known, but in series with it.

Thus, the invention has

high speed control condition

5 loads compared to the known and this

reduces the time it takes to turn on

devices.

Claims (1)

Invention Formula A constant voltage source containing a key converter connected to the power bus, the control input of which is connected to a control unit having a pulse shaper, a triggering unit including a threshold device connected between the power bus and the power supply terminal of the control unit, a current sensor in the power circuit and a trigger output connected to the input of the control unit, characterized in that increase reliability by reducing the duration of the process of switching on the device by introducing a high-speed control of the load, the pulse shaper is designed as a series-connected input differentiating circuit, one-shot, threshold element, and circuit, the current sensor is designed as a current transformer, the primary winding of which is connected between the one-shot output connected to the first input of the AND circuit and the input of the threshold element connected through the input measuring resistor with a common power bus, the secondary current transformer winding is connected to the output circuit of the key converter, while the output of the threshold element is connected to another input of the AND circuit whose output is connected with trigger input. FIG. I