SU888084A2 - Dc voltage power supply source - Google Patents

Description

(54) POWER SUPPLY CONSTANT VOLTAGE

one

The invention relates to electrical engineering and can be used to power telecommunications equipment.

Basically auth.St. No. 705434 describes a DC power supply source containing a pulse stabilized converter, an input connected via a measuring resistor to the input terminals, and an output terminal of the output terminals, an overload comparator, the output of which is connected by the switching input of a pulsed stabilized converter, and the input through a threshold voltage source connected to the measuring a resistor, a load resistor, one output of which is connected to one of the output power conductors, a switch, a galvanic isolation unit, a comparator an intermediate load and a resistive divider with a midpoint; the other lead of the load resistor is connected to another output lead through a switch whose control input is connected to the output of the underload comparator through the galvanic isolation unit, the other input to the measuring resistor resistive divider input

connected in parallel with the source of the threshold voltage 1.

A disadvantage of the known power source is low efficiency and reliability due to the low availability of the technical diagnostics of the device.

The aim of the invention is to increase the efficiency and reliability of the device.

The goal is achieved by introducing a control signal correction unit, connected in between, to the proposed DC power source. the output of the underload comparator and the input of the galvanic isolation unit,

15 wherein the control input of the said control signal correction unit is connected to the switching input of the stabilized switching converter.

20

The block diagram of a DC power supply is shown in the drawing.

The power source contains an overload comparator 1, between the input of which are connected in series the sources of the threshold voltage 2 and the measuring resistor 3. One input of the pulse stabilized is connected to the input terminal 4

30 voltage converter 5, and

The input terminal 6 of the power supply another input of the pulse stabilized voltage converter 5 is connected via measuring resistor 3. The switching input of the pulse stabilized converter 5 is connected to the output of the overload comparator 1. Parallel to the source of the threshold voltage 2, a resistive divider with a midpoint 7, whose midpoint is connected with one of the inputs of the underload comparator 8, the other input of which is connected to the common connection point of the measuring resistor 3 and the comparator input Overloads 1. The output of the galvanic isolation unit 9 is connected to the control input of the key 10. Between the output terminals 11 and 12 of the voltage source, there are connected in series resistor podgruki 13 and the key 10. The output unit correction signal control 14 whose control input is connected to the switching input of the pulse stabilized Converter 5.

The difference between the operation of this device and the operation of the prototype device lies in the interaction of the switching signal of the pulsed stabilized voltage converter 5 and the resistor control signal of the podgruki 13.

In this device, by connecting the output of the underload comparator 8 to the input of the galvanic isolation unit 9 through the controlled correction unit 14, the load resistor enable signal is not generated when there is a shutdown signal at the switching input of the voltage converter 5. Indeed, the control input of the correction unit 14 is connected to the input switching voltage converter 5. If there is a VC signal at the input of the switching converter 5, the control signal correction unit 14 is in a closed conductive state NII. Moreover, if there is an underload of the power source, in the proposed device, as in the prototype, the signal

from the output of the underload comparator 8 through the galvanic isolation unit 9 enters the control input of the key-. Cha. 10. When a switching-off converter 5 appears at the switching input, which corresponds to the emergency or backup conversion mode 5, the control signal correction unit 14 is set to open non-conducting state. The signal from the output of the underload comparator 8 does not pass through the correction unit 14. In this case, the galvanic isolation unit 9, such as an optoelectronic device, and the key 10 are in the initial locked state and do not consume additional power, which increases the efficiency of the proposed power source, While in the prototype in emergency or standby mode, the converter 5 consumes additional power to turn on the galvanic isolation unit 9 and unlock the key 10.

In addition, in this device, using the additionally introduced unit of correction of the control signal 14, the ambiguity of the indication of underutilization of the power source is eliminated. Indeed, it is only after the control signal correction block 14 that it is unambiguously unambiguous to judge the underload of the power source.

Claims (1)

1. USSR author's certificate No. 705434, cl. G 05 F 1/56, 12.09.77.