SU1427529A1 - Secondary power supply source - Google Patents

Abstract

The invention relates to electrical engineering. The goal is to improve reliability by eliminating the asymmetries of the inverter operation. In the device, starting conditions are improved by turning on windings 7, 8 throttles 6, shunted by series capacitor diode chains 13-15 and 14-16, sequentially in the primary winding 5 of the power transformer 2 of the inverter I, End and the beginning of the windings 7, 8 are connected via dividing diodes 9, 10, 11, 12 to the inputs of the inverter 1. The choke 6 takes on the switching currents of the load and reduces the dynamic losses of the transient process. Inverter 1 is turned on in a lightweight mode, in which transformer 2 is not included in the asymmetrical definition. 1 il.

Description

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The invention relates to electrical engineering and can be used in the secondary bristles of power systems of radio engineering, automation and computing systems.

The aim of the invention is to increase the reliability of the secondary power source by eliminating the asymmetry of the inverter operation.

The drawing shows an electrical functional diagram of the secondary power supply source. : Secondary power supply source Contains an inverter 1 (made, for example, according to a bridge circuit), a power {transformer -2, to the secondary winding L3 of which a rectifier with {filter 4 is connected. In series with the primary 1 winding 5 of the transformer 2 on | choke 6 with the first 7 and second 8 (windings, the beginnings of which through the first i and 9 second and second decoupling diodes are connected to the outputs of the inverter 1 and the cathodes of the third 11 and fourth to 12 diodes, respectively, and the ends of the first 7 and second 8 windings are connected with the beginning and end of the primary winding 5 forces Transformer 2 and anodes of the third 11 and fourth diodes, respectively, respectively.At parallel to the first 7 and second 8 windings of the throttles 6, there are connected circuits consisting of series-connected capacitors 13, 14 and diodes 15, 16.

The device works as follows.

When applying a constant voltage to the input of the inverter, the latter starts to work. At the initial moment of turning on the inverter 1, the resistance — windings 7, 8 of the throttles 6 is relatively large, and all the voltage across it drops and then gradually decreases, i.e. at the moment of switching on, the choke 6 prevents a significant increase in the switching load currents, the voltage at the source output increases smoothly, which ultimately creates favorable conditions for starting the inverter.

Suppose that in the positive half-cycle the current flows from inverter 1 through diode 9, the first winding 7 droplets 6, the primary winding 5 of transformer 2, diode 12 and inverter 1. With the same current, the capacitor 13 is charged through diode 15. In the negative half-period, the current flows from the inverter

1 through diode 10, second winding 8 droplets 6, primary winding 5 of transformer 2, diode 11 and inverter 1 simultaneously charge and capacitor 14 through diode 16. If there is no asymmetry in inverter 1, then the currents flowing through the first 7 and second 8, the throttle windings are equal and, accordingly, the voltages on the capacitors 13, 14 are also equal.

Suppose, due to differences in the characteristics of the elements or when the load current changes, an asymmetry of the inverter arises, for example, in the positive half-period, an increased current flows from the inverter 1 through the diode 9, the first winding 7 throttle 6, the primary winding 5 of the transformer 2, the diode 12, as a result of which on the capacitor 13 increases. But since the windings 7.8 of the throttles 6 are magnetically coupled to each other and are connected according to, the voltage across the capacitor 14 will increase accordingly. In the negative half-period, in which, due to asymmetry, the current is less, the voltage of the capacitor 14 increased from the current into the half-body half-period, compensates for the difference in the half-cycle currents by increasing the current through the second winding 8 throttles 6, thereby aligning the currents of the throttles 6. The voltage on the capacitor 13 this half period is higher, so it is discharged through the first winding 7 chokes 6 to a value equal to the voltage on the capacitor 14.

If, however, with the asymmetry of inverter 1, the current increases in the negative half-period, then the whole process proceeds similarly with the transfer of energy from capacitor 14 to capacitor 13.

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Thus, in the proposed

The technical solution automatically almost completely eliminates the asymmetry in the operation of the inverter, which ensures an improvement in the quality of the output energy, reliable start-up of the inverter regardless of the type of load and output filters, which ultimately increases reliability and allows an increase in the output power of the secondary power supply.

Claims (1)

Invention Formula The secondary power supply source containing an inverter, the DC input of which is connected, to the input terminals, a power transformer, the secondary winding of which is connected via an output terminal, first and second capacitor-diode circuits, shuntly corresponding to the first and the second choke coils, the first and second decoupling diodes, the third and fourth diodes, in order to increase reliability by eliminating the asymmetry of the inverter, the first and second dross flax winding arranged on one core and are included in a series circuit.  consisting of a first isolating diode, a first choke winding, a primary winding of a power transformer, a second choke winding, and a second isolating diode, and the first and second outputs of the inverter are turned on, and the third diode is connected between the first output of the primary winding transformer and the first output of the alternating voltage of the inverter, and the fourth diode, respectively, between the second of the primary winding of the power transformer and the second of the direct voltage inverter.