SU1334328A1 - Device for charging reservoir capacitor - Google Patents

Abstract

The invention relates to electrical engineering, in particular to sources of secondary power supply for pulsed lighting equipment. The purpose of the invention is to increase the stability of the output power. Due to the introduction of the reference Zener diode 10 and the resistive current sensor 11, as well as the implementation of the amplifier 6 with two inputs, the current flowing in the primary winding 3 of the transformer 2 is stabilized during the time interval before the transistor switch 5 locks when exposed to various destabilizing factors. In this case, periodic locking of the transistor switch 5 takes place at the moments of comparison of the voltage on the resistive current sensor 11 with the reference voltage on the Zener diode 10. The reverse switching-on diode 7 is used in the circuit. 1 Il. 5S O)

Description

The invention relates to electrical engineering and is intended for use in the implementation of power supply for pulsed lighting installations, such as flashlights.

The purpose of the invention is to increase the stability of the output power.

The drawing shows the circuit diagram of the proposed device for charging the storage capacitor.

Position 1 denotes a storage capacitor. The device includes a transformer 2 with a primary 3 and a secondary 4 windings, a transistor switch 5j amplifier 6 with two input terminals, a rectifying diode 7 ,, a current limiting resistor 8, a bias resistor 9, a reference Zener diode 10 and a resistance sensor 11 currents. Positions 12 and 13 denote, respectively, the potential supply bus and the zero potential bus, position 14 denotes the output potential output of the device. The collector of the transistor switch 5 through the primary winding 3 of the transformer 2 is connected to the potential supply bus 12. The rectifying diode 7 is connected in the opposite direction between one of the leads of the secondary winding 4 of the transformer 2 and the output potential output 14 of the device, the first input potential of the amplifier 6 is connected with another output of the secondary winding 4 of the transformer 2 and through the current-limiting resistor 8 with the potential supply bus 12, and the output output is connected to the base of the transistor switch 5 connected via a screw an offset 9 with a bus 13 of zero potentiometer. The resistive current sensor 11 is connected between the emitter of the transistor switch 5 and the zero potential bus 13, the main zener diode 10 is connected to the output potential of the amplifier 6 and the zero potential bus 13. The second potential input terminal of the amplifier 6 is connected to the potential resistive output of the current sensor 11.

The device works as follows.

When the supply voltage is supplied to the buses 12 and 13 at the first moment, the current through the resistive sensor 11c flows and between the input powers

The outputs of amplifier 6 are set to a voltage equal to the voltage of stabilization of Zener diode 10. Due to this, amplifier 6, and through it, transistor switch 5 is opened and a current begins to flow through the primary winding 3 of transformer 2 windings 3 and 4 of transformer 2 are indicated by dots. When such windings are turned on, the polarity, the voltage on the secondary winding 4 is such that diode 7 is in a non-conducting state, the storage capacitor 1 is not charged at this time, through the primary winding. 3, the transformer 2 flows a linearly increasing current, the value of which is determined from the relation:

J - t.

where E is the voltage of the power source;

L inductance of the primary winding 3 of the transformer 2; t is the current time. In the magnetic field of the transformer 30, energy is accumulated.

five

0

five

0

five

When the current in the primary winding 3 of the transformer 2 reaches the value at which the voltage on the resistive current sensor 11 becomes equal to the stabilization voltage of the zener diode 10; the voltage between the potential input terminals of the amplifier 6 is zero, the amplifier 6 and the transistor switch 5 are closed. The current through the primary winding 3 of the transformer 2 is terminated. The EMF on the windings 3 and 4 of the transformer 2 changes the polarity to the opposite, the rectifying diode 7 turns into a wire -. condition. The energy stored in the magnetic field of the transformer 2 begins to be transferred to the storage capacitor 1, and direct current flows through the zener diode 10. In this case, the voltage between the input potential transducers of the amplifier 6 changes the polarity to the opposite, relative to the initial one, and keeps the amplifier 6 closed. The resistor 9 supports the closed transistor switch 5.

The charge current of the storage capacitor 1 decreases with time

with value - where - K - coefficient

Transformer Transformations 2..

When the charge current of the storage capacitor 1 becomes less than the current flowing through the resistor 8, the voltage between the potential input terminals of the amplifier 6 changes polarity and the amplifier 6, and therefore the transistor switch 5 is opened, and the process repeats. The voltage across the storage capacitor 1 increases.

The design of the charging device makes it possible to stabilize the amount of current flowing in the primary winding 3 of transformer 2 in the time interval before locking transistor switch 5, and hence its output power when exposed to various destabilizing factors (change in ambient temperature, aging of elements, etc. .).

Claims (1)

Invention Formula A device for charging a storage capacitor containing a transistor switch, the collector of which is connected to the potential supply bus through the primary winding of the transformer, a rectifying diode connected back between one of the terminals of the secondary winding of the transformer and the output potential output of the device, the amplifier first The input potential output of which is connected to another output of the secondary winding of the transformer and through a current limiting resistor to the potential supply bus, and the output output connected to the base of the transistor switch connected to the zero potential bus, characterized in that, in order to increase the stability of the output power , a resistive current sensor and a Zener diode are inserted into it, and the amplifier is made with a second potential input terminal, with the resistive sensor A current is connected between the emitter of the transistor switch and the zero potential bus, the reference Zener diode is between the first potential input of the amplifier and the potential zero bus, and the second potential input of the amplifier is connected to the potential output of the resistive current sensor.  J VNIISH Order 3977/55 Random polygons pr-tie, Uzhgorod, st. Project, 4 Circulation 659 Subscription