SU628479A1 - Dc voltage supply source - Google Patents

Description

The information is in the field of electrical engineering and can be used as a secondary source of physical fitness.

Power sources of constant voltage l are known.

The closest solution among those known among the known ones is the source of a DC power supply, containing sequentially; not a power rectifier, an input C filter, a key regulator with an Ul} filter at the output, and a half-bridge torus, the secondary winding of the output transformer of which, via a rectifier, is connected to the terminals for connecting the loads 2.

However, the network voltage is applied to the circuit and the alternating device, the network voltage is applied to the transistor of the key regulator, since the constant recharging of the UD filter throttles is insignificant because the chokes in the high-frequency converters are selected with a small inductance

The current through the transistor is determined by the internal shape of the depy, the resistance of the diodes of the network rectifier and the dynamic resistance of the condansagr. half bridge inverter. This current reaches several tens of amps and so on with the output voltage of modern high-voltage transistors, which reduces the reliability of power sources.

As is well known, an increase in the value of a radio element on the radiofixed devices reduces their reliability, limits the choice, makes hardware developers use semiconductor devices that are in short supply, unnecessarily complicates the equipment ;,

The purpose of the invention is to reduce the voltage level on the elements of the frame.

Claims (1)

The goal is achieved by the fact that in a known device at the junction point of the capacitors of a half-bridged inverter, one of the plates of an input LC filter Fi filter is one of the electrodes of the bottom of a key regulator. The drawing shows a GFU electrical circuit of the proposed source. The device contains a series-connected rectifier 1, an input LC filter 2 with a choke 3 and a capacitor 4, a key controller 5 with a transistor 6 and an LD filter at the output with diode 7 and a choke 8 and a half bridge inverter 9, which includes capacitors: 10 and 11, key elements 12 and 13, the output transformer 14, the secondary winding 15 of which is connected through the terminal 16 to the load 17, the voltage of the primary source, the output voltage of the key regulator. The device works in the following way. The AC mains voltage applied to the input terminals of the network rectifier 1 is also rectified through a choke. The 3 input Cr of the filter 2 is fed to the capacitors 4 and 11, which are discharged at the time of switching on, and the input voltage of the key regulator 5 is zero. Thus, at the moment of switching on, all input voltage is applied to the windings. Drossel 3, the current through which cannot be changed abruptly, and the diodes of the network rectifier 1 and the 1st section of the power supply cable, which are usually installed at the input, of the power supply locks, are protected from the hfobones. The capacitors 11 begin to charge. In this case, the voltage on each tends to a value, inversely proportional to the actual value, of their capacitance. After some time, the transistor 6 is turned on and the voltage of the capacitor is applied to the diode 7, the lower voltage and the "". At the same time, a capacitor U is charged through the droroel 8, and in the half-bridge inverter 9 circuit is generated and generated. As you know, during the operation of a semi-bridge inverter, the capacitors are naked on its capacitors and on the primary winding of the output transformer 14 and their values correspond to half the input voltage value (in this case (2,). The primary winding voltage is transformed into the secondary winding 15 and through the rectifier 16 enters the load 17. At the time interval corresponding to the open state of the transistor 6, the transistor is closed and the winding of the throttles 8 is connected in parallel with the capacitor 1O, since the diode 7 is open. At this time, the inductor 8 is equal to Hjyj (/ 2, and on the transistor 6: Inlet voltages on the winding of the inductors 8: Ve l BX-BblXCondenser 4 of the input filter 2 during the operation of the power source is under constant voltage } Since the pulsation on capacitors U and 11 is smoothed by high-frequency key regulator 5 during operation, it is possible to choose capacitor 4 with a smaller capacity, i.e., smaller in size, and an increase in the power factor of the device, which is very important in the design. Thus, at the moment of switching on, there are no overvoltages on individual circuit elements, and in the process of operation, the pulsed ones on the power electrodes of the radio elements are lower than in known devices. Claims The power supply source of a constant voltage containing a series-connected rectifier, a UC input filter, a key regulator with an LD filter at the output, and a half bridge invarior, whose output winding is connected to the terminals for connecting the load, This means that, in order to reduce the voltage level on the elements of the source circuit, one of the plates of the input LC filter and one of them are connected to the connection point of the capacitors of the continuous inverter. N electrodes of the diode CR filter key regugshtora. Sources of information: taken into consideration. Upon examination: 1. USSR Copyright Certificate No. 467338, class, Q 05 F 1/64, 1973. 2, c. I. Meleshin et al. Miniaturized alternating voltage converters to stabilized constant. Sat Art. Electronic Engineering in Automation, ed. Yu. I. Konev, vol. 7, M., Soviet Radio, 1975, p. 36, rice, 5,