SU1555703A1 - Power source with protection - Google Patents

Abstract

The invention relates to electrical engineering and can be used to power various electronic devices. The purpose of the invention is to increase reliability by providing noise immunity of protection. For this purpose, a setup node 9, a trigger 8, an indicator 10 and an element OR 6 are entered into the device. If there is an overload at the device output, the voltage at the output of the amplifier 3 exceeds the threshold of the comparator 4, and a logical signal "1" is generated at its output, the element OR 6 at the time of overload closes the regulating element of power supply 1, at the same time the signal is fed to the input of the one-shot 5, the lock is removed from the R-input of counter 7. If the number of overloads registered by the counter 7 is less than the backside during the one-shot pulse Annually, power supply 1 is turned back on. If there are more than a specified number of overloads, the state of the trigger 8 changes, the output signal of the OR 6 blocks the operation of the power source, the indicator 10 signals the presence of an overload. 1 hp f-ly, 1 ill.

Description

The invention relates to electrical engineering and can be used to power various electronic devices.

The purpose of the invention is to increase reliability and enhance functionality.

The drawing shows the scheme of the secondary source.

The source contains a power supply source 1, in the power circuit of which a current sensor 2 is connected, the current sensor being connected to an amplifier 3, the output of which is connected to one of the inputs of the comparator 4, the output of the comparator 4 is connected to the input of the one-shot 5, to one of the inputs of the OR circuit 6 and Ovkhod Counter 7, on the V-input of which the Log level is fed. and the R-input is connected to the output of the one-shot 5, the output of the counter 7 is connected to the R-input of the trigger 8, to the S-input of which the setup node 9 is connected, the direct output of the trigger 8 is connected to the indicator 10, the inverse to the second input of the OR circuit 6, the output of which is connected to the blocking input of the power supply source 1.

The single-vibration 5 contains a flip-flop 11, whose C input is the input of a single-vibration, and the R input is connected to resistors 12, 13 and a capacitor 14, the second output of which is connected to the collector of transistor 15, the second output of resistor 12 is connected to the emitter of transistor 15, the base, which through a resistor 1b is connected to another output of the resistor 13 and the output of the trigger 11,

The secondary source works as follows.

When turned on, the node 9 of the initial setup generates a single positive pulse arriving at the S input of the trigger 8, and sets it to the Log state. 1 at the direct output (the indicator is off) and to the Log state. Oh on the inverse,

In normal operation, when the voltage on the current sensor 2 is such that the voltage at the output of amplifier 3 is less than the threshold for the comparator 4, at its output there is a Log signal. O, at the output of the one-shot there is a signal Log, 1, which enters the R input of the counter 7, the output of which contains a signal Log, 0. When there is an overload, the voltage on the current sensor 2 becomes such that the output voltage of amplifier 3 exceeds the threshold actuation of the comparator 4. At the same time, a signal Log, 1 is formed at its output, which, through the OR 6 circuit, closes the regulating linear or key element of the power source 1 through the OR circuit, arriving at its blocking input. The same signal is fed to the input of the one-shot 5, at the output of its signal Log is formed. O, which allows registration of the overload, remove the lock from the R-input of counter 7, through synchronization. A single-oscillator fulfills a predetermined time T ". If during this time the number of overloads detected by the counter 7, less than the predetermined one, a Log signal is formed at the output of the one-vibrator. 1, which, arriving at the R input of the counter, will reset all its bits to O. In the presence of a number of overloads, more than a specified time T, the output of the counter 7 produces a signal Log. 1, which changes the state of the trigger 8. At the inverse of its output a Log signal is formed. 1, which is through the scheme OR 6

blocks the operation of the power source; a signal Log is formed at the forward output of the trigger 8. O (the Avarion indicator is on).

The single-vibration 5 operates as follows. In normal operation, the direct output of flip-flop 11 has a signal Log. Oh, on the inverse - signal Log. 1, transistor 15 OFF ™, capacitor 14 discharge. When an overload occurs on Ovhod of the trigger 11, a signal is received from the Log, 1 at its direct output a signal is generated from the Log, 1, the transistor 15 is closed, on the inverse, which is the output of the one-oscillator, the signal from the Log. O, and the capacitor 14 is charged through the resistor 13. Through time T, determined by RC circuit 13, 14, the Log signal is formed at the R-output of the flip-flop. 1, the output of the one-shot (inverse trigger output) produces a signal Log. 1, a signal of log 0 is formed at the forward output of the trigger, transistor 15 opens (the base current flows through resistor 16) and discharges capacitor 14 through resistor 12, after which the one-oscillator is reset.

Thus, the proposed secondary source significantly increases the reliability of the protection by turning it off after a certain period of time and extends its functionality by introducing an indication.

Claims (3)

Invention Formula 1, A secondary power supply with protection, containing a common power bus and a protection unit, including a one-shot vibrator and a counter, characterized in that, in order to increase reliability by 0 five 0 ensure protection of immunity, the installation unit, trigger, element OR, amplifier, comparator, and current sensor are included in the common power bus, the output of the current sensor is connected to the input of the amplifier whose output is connected to the one-shot input to the C input the counter and to the first input of the OR element, the output of the one-shot is connected to the R-input of the counter, the V-input of which is connected to an output for connecting a signal source of a logical unit, and the output of the counter is connected to the R-BLED trigger, whose S-input is connected n to the output of the setup node, the inverse output of the flip-flop is connected to the second input of the OR element, the output of which is the blocking output, 2. A secondary source according to claim 1, characterized in that the one-shot is made on a trigger, a transistor, three resistors and a capacitor, the trigger is connected to the common bus, the D input is connected to an output for connecting a signal source of the logical unit, the C input is the one-shot input, and the inverse output of the trigger by the one-shot output, the collector of the transistor is connected to the common bus, the emitter through the first resistor to the R input of the trigger, to the first capacitor output, and through the second resistor to the forward output of the trigger to which it is connected aza transistor via a third resistor and a second terminal kondensateo Ra connected to a common bus. 3. The secondary source according to claim.), Characterized in that, in order to increase the operational reliability, an indicator connected to the forward trigger output is introduced into it. five 0 five five