SU1376072A1 - D.c. voltage pulse stabilizer - Google Patents

Abstract

The invention relates to electrical engineering and can be used in secondary power supplies of radio electronic equipment. The goal is to increase reliability by increasing the speed of protection in the event of overcurrent and to ensure smooth start-up. The overcurrent signal is removed from the sensor 5 at the moments of the closed state of the regulating element and fed to the comparator 7, where it is compared with the reference signal, as a result of which, at a certain output current, the comparator 7 operates and sends a signal to the blocking input of the control unit 2, which generates pulses control element 1. The pulse duty rate is reduced. When the stabilizer is turned on, a smooth increase in current and voltage is ensured. In addition, the stabilizer can be turned off with the switch-off state in case of prolonged overcurrent due to the effect of the comparator 7 through the delay element 8 and the trigger 9. 1 Cp f-ly, 3 ill. I (L

Description

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The invention relates to electrical engineering and can be used in secondary power supplies of radio electronic equipment.

The purpose of the invention is to increase reliability by increasing the speed of protection in case of overcurrent and to ensure a smooth start at start-up, as well as to ensure switching off at long-term overload.

Fig. 1 shows a functional diagram of a DC voltage regulator; FIG. 2 shows a pulse stabilizer with galvanic isolation between the input and output; FIG. 3 shows timing charts of current and voltage of a stabilizer.

The stabilizer (Fig. 1) contains a regulating element - a transistor 1, a control and feedback unit 2, an output bcb filter 3, a protection node with a current sensor 4 made on a resistor 5 and a diode 6 and with a comparator 7, the output of which connected to the inhibitory input of the unit 2, which by its output is connected to the control input of the regulating element, and the input to the output output. In addition, in the node protection in the output circuit of the comparator 7 can be included in series the delay element 8 and the trigger 9.

When implementing a device with galvanic isolation between the input and the output, the stabilizer contains (Fig. 2 a transformer 10, a rectifying diode 11 and elements 12 and 13 of the galvanic isolation of the feedback circuits, respectively, for current and voltage.

The device works as follows.

When connected to a power source stabilizer, unit 2 generates control pulses that ensure periodic activation of regulating element 1 in accordance with the feedback signal. This ensures a stable output voltage at the output. Information about the output current is generated in circuit 4 during the locked state of the regulating element 1.

In the startup mode, the control pulses from block 2 arrive with a minimum duty cycle, since the device operates with current limiting. At the same time, the resistor 5 produces a signal about the output throttle current

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filter in the moments of the closed state of the regulating element 1, which acts on the comparator. This ensures that the stabilizer is switched on smoothly (diagrams 3). This process takes place until the nominal voltage is reached at the output of the stabilizer, and the current decreases to the nominal value.

In the overcurrent or short circuit mode at the output, the voltage drop across resistor 5 increases and the stabilizer changes from voltage stabilization mode to current stabilization mode in the manner described.

If necessary, during long-term current overload, circuit 8 and 9 block the switched-off state of the regulating element after a certain time specified by delay element 8.

The protection in the stabilizer with galvanic isolation of the input from the output (Fig. 2) works similarly.

Thanks to the means introduced, protection performance is improved and smooth start-up is ensured at start-up, which increases reliability. Additionally, the stabilizer can be turned off during long-term current overload.

Form u la inventi

t. A DC voltage regulator containing a regulating element, the control input of which is connected to the output of the control unit connected by its input relative to the common output bus to the output terminal, and the inhibiting input to the output of the protection node whose resistor is connected to the common output bus , an output LCD filter, characterized in that, in order to increase reliability by increasing the protection performance in case of overcurrent and ensuring smooth start-up, a diode is inserted into the protection node, comparative op and a voltage source connected to one of the inputs of the comparator, the output of which is connected to the output of the protection node, and the other input to the connection point of the resistor and diode, the other output of which is connected to the same output diode of the output LCD filter.

2. The impulse stabilizer according to claim 1, characterized in that, in order to ensure a shutdown upon continuous overload, to its node

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protection introduced consistently connected to the delay element and the trigger included in the output circuit of the comparator.

FIG. 2

Limiting current

Claims (2)

Claim 1. A pulsed DC voltage stabilizer containing a regulating element, the control input of which is * connected to the output of the control unit, connected by its input relative to the common output bus with the output terminal, and by the inhibiting input with the output of the protection unit, the resistor of which is connected to the common output bus, the LCD output -filter, characterized in that in order to increase reliability by increasing the speed of protection during overcurrents and ensuring a smooth start-up, a diode, a comparator a reference voltage source connected to one of the inputs of the comparator, the output of which is connected to the output of the protection unit, and the other input to the connection point of the resistor and diode, the other output of which is connected to the diode output of the output LCD filter. 2. The pulse stabilizer according to claim 1, characterized in that, in order to ensure shutdown during prolonged overload, a delayed element and a trigger are connected in series to its protection node, which are included in the output circuit of the comparator. FIG. 2 Fi g. 3