SU797021A1 - Ac-to-dc voltage converter - Google Patents

Description

one

The invention relates to a conversion technique and can be used as a power source with two voltages of different levels.

AC / DC converters are known, consisting of a valve system and capacitive smoothing filter ij.

However, the well-known converters have the disadvantage that in order to obtain two voltages of different levels, they use a damping resistor or voltage divider on the resistors with a filter capacitor, which significantly reduces the efficiency of the rectifier, or another similar rectifier, to the input of which voltage is supplied from the other winding of the transformer.

The closest to the present invention is an AC voltage to DC converter containing a valve rectifier, the DC outputs of which form the output terminals and a capacitive smoothing filter, one output connected to one of the output terminals Y.

The disadvantage of this converter is the low efficiency when receiving the output voltages of different levels.

The purpose of the invention is to increase efficiency when receiving two output voltages of different levels.

This goal is achieved by

that a converter of alternating voltage to constant voltage contains a valve rectifier whose direct current terminals form terminals and capacitive smoothing filter

one terminal connected to one of the output pins, a threshold switch, a shunt diode, and a charge chain consisting of a series-connected positive valve and a capacitor, and the other output of the specified capacitive smoothing filter, are connected to the second output terminal through the charge chain, in parallel which

a threshold switch and a shunt diode are turned on, and the connection point of the auxiliary valve and the capacitor forms the third output terminal.

Fig. Shows a block diagram of the proposed device; in figure 2

the currents of currents and voltages, according to his work.

The converter consists of a venil rectifier 1, a smooth capacitor of a filter, a charging circuit consisting of a diode 3 and a capacitor 4 and parallel to which a shunt diode and a threshold switch (PC) b are connected, the diode 3 being connected to the negative plate of the capacitor 2, and the cathode is connected to one plate of capacitor 4, the other of which is connected to the negative output terminal 7. The shunting diode 5 is connected by the cathode to point 8 of the connection of capacitor 2 and diode 3. Low voltage load 9 is turned on by output output 7 and n lozhitel hydrochloric capacitor plate 4, a load 10 is connected between the output terminal 7 and 11.

The converter works as follows.

In the established mode, in each half-period of the mains voltage, when the instantaneous voltage} at the output of the rectifier 1 becomes greater than the voltage Up on the capacitor 2, the time begins when the capacitor 2 and 4 of the capacitor Bp along the circuit: the rectifier, capacitor 2 is an open charge diode 3 co-capacitor 4 is a rectifier. At this time, the shunt diode 5 and the threshold switch b are closed and the current is not conducted. When the voltage on the capacitor 4 reaches the threshold of the threshold switch b, the latter opens and shunt the circuit from diode 3 and the capacitor 4. This occurs at the time of start from which the capacitor 2 continues to be charged through the open threshold switch b to Moment i Since the diode 3 for the discharge current of the capacitor 4 is turned in the opposite direction, the capacitor 4 will be discharged only in its load 9-, maintaining on it the required voltage s. After the completion of the capacitor 2 charge, the threshold key b is closed. Starting from this point in time 4cj), the capacitor 2 will be discharged to the load through a 111 un: diode S.i

Such a circuit) power supply in installation with one rectifier

A driver, where two or more voltages of different levels are required, increases the efficiency of the rectifier as a whole due to the exclusion of energy losses on the damping resistors, since the losses on the open charge and discharge diodes and on the threshold switch are much less than on the damper. resistor with the same output power of the rectifiers. The output voltages of the converter can have different polarity. For this, diode 3. and capacitor 4 should be swapped and the common point of the loads will be point 8.

Thus, the use of the proposed converter circuit with one rectifier and two or more output voltages increases the efficiency.

Claims (2)

1. Dodik S.D. et al. Power supplies on semiconductor devices. M., Soviet Radio, 1969 p.447. 2. Roginsky V.I. Current transducers. M., Military Publishing Mi - ,, Union Defense of Soviet Union, 1360, c.337-38i