SU1330619A1 - Secondary electric power supply device - Google Patents

Abstract

This invention relates to secondary power devices. The purpose of the invention is to reduce the starting current when turned on. The goal is achieved by introducing converter 1.0, zener diode 25, capacitor 16, diodes 14 2 19, fourth transistor 23, resistors 15.21 and 2 relays / - time 26, and switch 17. After power is turned on, the capacitor 16 is charged through elements 21, 19, and 11. Through the transistor 23 and the resistor 24, the capacitor of the LCD filter 1 is charged. After charging the capacitor 16, the time switch 26 turns on the switch 17, the transistor 13 opens and supplies power to the control unit Z. The outputs of the block 3 appear pulses , start-up stabilizer 2 and converter 10. Due to wind and condensation ator 16 and LCO-reduction filter is provided inrush currents. 1 il. g (L

Description

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The invention relates to devices for converting direct current energy at the entrance to direct current energy in the course with a series regulating element and can be used in the sources of secondary power supply of electronic equipment.

The purpose of the invention is to reduce the starting current when switched on.

The drawing shows a circuit diagram of a secondary power supply device.

The power supply device contains an LCD filter 1, the input of which is connected to the emitter of the first transistor 2, the base of which is connected to the output of the control unit 3. Control input 4, start input 5, common input 6 of control unit 3 are connected respectively to the output of the LCD filter 1, to the emitter of the second transistor 7 and to the negative input terminal 8 of the power supply, input 9 of the power supply of the control unit 3 NIN is connected to the second output of the converter 10. The first output of the converter

10 connected to output terminals

11 for connecting the load, the first input is with the output of the LCD filter 1, the second input 12 is with the output of the control unit 3. The collectors of the first transistor 2, the second transistor 7, the emitter of the third transistor 13,

the cathode of the first diode 14, the first output of the fourth resistor 15, the plus plate of the capacitor 16 and the output of the switch 17 are combined. The base of the second transistor 7 is connected via a differentiating RC circuit 18 to the collector of the third transistor 13, the base of which is connected to the anode connection point of the first diode 14, the cathode of the second diode 19 and one of the terminals of the first resistor 20, the second output of which is connected to the negative terminal 8 of the power supply . The anode of the second diode 19 is connected via the second resistor 21 to the positive input terminal 22 of the power supply and to the emitter of the fourth transistor 23, the collector of which is connected via the third resistor 24 to the output of the LCD filter 1 and the base is connected to the second output of the fourth resistor 15. Stabilitron 25 is on between the base of the second transistor 7 and the negative terminal of the power supply 8. The first time relay input 26 is connected to the input.

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key 17 and is connected to the positive power terminal 22. The second input of the time relay 26 is connected to the negative terminal of the capacitor 16 and the negative terminal 8 of the power supply. The output of the time relay 26 is connected to the control input of the switch 17.

The secondary power supply device consists of an input key voltage regulator with pulse-width modulation with a serial control element and a converter connected to the output of the stabilizer.

The operation of the device is secondary. The power supply is as follows.

When the equipment is turned on, power is supplied to power terminals 8 and 22. In this case, the time relay 26 produces at its output a signal providing the locked state of the key 17. The capacitor 16 starts charging along the circuit: the positive power terminal 22, the second resistor 21, the second diode 19, the first diode 14, the capacitor 16, the negative power terminal 8. The maximum charge current is determined by the second resistor 21. Due to the positive bias on the base, the third transistor 13 is locked and the control unit 3 does not receive a supply voltage, i.e. stabilizer and converter 10 not

work. The capacitor 16 is charged before the supply voltage minus the voltage drop across the two diodes. Due to the negative bias on the base of the fourth transistor 23, the capacitor of the filter 1 is charged through the third resistor 16 and the resistor 24 selects the charging current of the capacitor of the filter 1 and the voltage greater or equal to the voltage;

After charging the capacitor 16 and the capacitor of the LCD filter 1, the time relay 26 triggers and generates at its output a signal enabling the key 17. The key 17 is unlocked and the capacitor 16 is connected to the positive power terminal. The time of the relay 26 of the time 26 must be at least 2T, where T is the largest of the constant charging times of capacitor I6 and the capacitor of the LCD filter 1. At the base of the fourth transistor 23, a positive displacement appears and it closes, turning off

Claims (1)

stabilizer output from the input, and the claims based on the third transistor 13 on c. The secondary device provides a negative bias (due to the current flowing through the circuit: positive power terminal 22, second resistor 21, second diode 19, resistor 20, negative terminal 8 food) and it opens. A current pulse appears in the collector circuit of the third transistor 13, the duration of which is determined by the time constant of the differentiating RC circuit 18. A voltage pulse is generated at the Zener diode 25, which through the emitter follower on the second transistor 7 enters the trigger input 5 of control unit 3. At the output of the block, pulses appear, starting up the stabilizer and the converter 10. After starting up, the supply voltage to the control input 9 of the control unit is supplied from the second output of the converter 10. The starting current when the equipment is turned on is determined by the difference in the supply voltage and the voltage to which the capacitor 16 is charged, which is equal to the voltage drop across the two diodes (14, 19). The inrush current when opening the first transistor 2 without the third transistor is connected to This is because the LCD capacitor of the filter 1 is charged to a voltage greater than or equal to the stabilization voltage. For this reason, time the first and second transistors, the cathode of the first diode, the fifth terminal of the fourth resistor, the plus side of the capacitor and availability for operation after activation of the key, the base of the third time relay of relay 26 is zero, since in block 3 of the control there are no delays necessary for generating control pulses when the key stabilizer mode is smooth. The control unit 3 used in the device and the converter 10 can be made according to known schemes, and the time relay 26 can be made according to the one-shot scheme. the torus is connected to the junction point of the anode of the first diode, the cathode of the second diode and one of the terminals of the first resistor, the second output of which is under 40 keys to the negative input terminal, and the anode of the second diode through the second resistor is connected to the positive input terminal and to the emitter of the fourth transistor, whose collector 45 the third resistor is connected to the output of the LCD filter, the base of the fourth transistor is connected to the second terminal of the fourth resistor, the zener diode is connected between the base of the second transistor and the minus input terminal, the first input of the time relay is connected to the key input and connected to the positive input terminal, the second input of the time relay connected to the negative plate of the capacitor and the negative input terminal, the output of the time relay is connected to the control input of the key. Thus, the secondary power supply device allows to reduce the starting current when the equipment is turned on and to reduce the availability time due to the simultaneous charging of the capacitor and the LCD filter. Reducing the starting current when switching on leads to a reduction in electrical loads on the circuit elements and, consequently, increases the reliability of the device. nor containing an LCD filter, the input of which is connected to the emitter of the first transistor whose base is connected to the output of the control unit, the control input of which is connected to the output of the LCO filter, the start input to the emitter of the second transistor, the common input to the negative input terminal, the power input of the control unit, the collectors of the first and second transistors are combined, the base of the second transistor through the RC differentiating circuit is connected to the collector of the third transistor, and the first resistor, that, in order to reduce the starting current at when switched on, a converter, a zener diode, a capacitor, two diodes, a fourth transistor, three resistors, a time relay and a key are inserted in it, the first input of the converter is connected to the output LCD filter, the second input is connected to the output of the control unit, the first output is connected to the output terminals, and the second output is connected to the power input of the control unit, the emitter the collectors of the first and second transistors, the cathode of the first diode, the first output of the fourth resistor, the positive capacitor plate and 50 55 the torus is connected to the junction point of the anode of the first diode, the cathode of the second diode and one of the terminals of the first resistor, the second output of which is under 40 keys to the negative input terminal, and the anode of the second diode through the second resistor is connected to the positive input terminal and to the emitter of the fourth transistor, whose collector 45 the third resistor is connected to the output of the LCD filter, the base of the fourth transistor is connected to the second terminal of the fourth resistor, the zener diode is connected between the base of the second transistor and the minus input terminal, the first input of the time relay is connected to the key input and connected to the positive input terminal, the second input of the time relay connected to the negative plate of the capacitor and the negative input terminal, the output of the time relay is connected to the control input of the key.