Stand-alone inverter

 

(57) Abstract:

The invention relates to electrical engineering, can be used in converters with changing load, for example in converters with capacitive drive. Technical goal: expand the functionality of the Autonomous inverter due to the optimization of the charge storage capacitor. Stand-alone inverter contains six transistors, two diodes, three inductor, a capacitor, a rectifier element and a storage capacitor, characterized in that in the scheme entered the third 12 and fourth diodes 13 and filter capacitor 1, and the thyristors 6-9 and diodes 10-13 are connected in circuit single-phase bridge inverter, the diagonal of which is connected to storage capacitor 17 through the rectifying element 16, and throttle 2 large inductance, is connected to the input circuit, magnetometer with the throttle 3, closed-circuited thyristor pair of 4.5. 1 Il.

The invention relates to electrical engineering, can be used in converters with changing load, for example in converters with capacitive drive.

Known serial inverter (USSR author's certificate N 838965, CL H 02 M 7/515, 1981), soderzhaschyy a chain of two thyristors and two windings of the inductor, a common point which is connected with the common point of the capacitor through the primary winding of the output transformer, and an additional winding of the transformer one ends connected to the positive input to the output via the auxiliary thyristor and the second connected to the negative input the output of which is connected with one end of the additional winding of the inductor.

The disadvantages of this inverter is the design complexity and the need for special inductive elements.

Also known Autonomous inverter current (USSR author's certificate N 936300, CL H 02 M 7/515, 1982), containing thyristor bridge connected at its output capacitors, rectifier bridge, the conclusions of the constant current through the reactor is connected to the power bus of the thyristor bridge, phase-shifting transformer, included between terminals AC thyristor and rectifier bridges.

However, this stand-alone inverter current has considerable weight and performance.

The closest in technical essence to the present invention is a device for charging storage capacitor (USSR author's certificate N 651457, CL H 03 M 3/335, 1979), which contains tico made according to this principle, the device for charging storage capacitor is characterized by the complexity of the scheme, increased weight indication due to the low utilization of chokes, as well as increased duration of the charge due to the fact that the incremental energy charge per cycle is the same during the whole time of the charge.

The objective of the invention is to enhance the functionality of the Autonomous inverter due to the optimization of the charge storage capacitor.

This object is achieved in that in the stand-alone inverter contains six transistors, two diodes, three inductor, a capacitor, a rectifier element and a storage capacitor, unlike the prototype in the scheme entered the third and fourth diodes and a filter capacitor, and the thyristors and diodes are connected in circuit single-phase bridge inverter, the diagonal of which is connected to storage capacitor via a rectifier element and a choke connected to the input circuit, magnetometer with the throttle, closed-circuited thyristor pair.

The drawing shows a diagram of the proposed Autonomous inverter.

The device comprises a filter capacitor 1, connected in parallel to the power source, magnitosfernye inductors 2, 3, the first thyristor 4 and the second thyristor 5, connected to the first diode 10, a second diode 11, the third diode 12, the fourth diode 13, and the thyristors and diodes are connected in circuit single-phase bridge inverter, the diagonal of which included the orifice 14, the capacitor 15 and the rectifying element 16 with the storage capacitor 17 at the exit.

The device operates as follows.

Mode 1. The thyristors 4 and 5 are open and the throttle 3 is closed-circuited. When the circuit through the choke 2 runs varying input current, causing proteoids in the inductor 3, the compensating effect of the inductor 2 to the input current. Thus, the inductor 2 has no effect on the operation of the circuit.

When the firing of the SCRs 6 and 9, the capacitor 15 is charged from the power source through the inductor 14 and the load 17 through the rectifier 16. In the time determined by the circuit parameters, there is a transition current of the thyristors in inverse diodes 10, 13 and the capacitor begins to discharge into the load 17 through a rectifying element 16 and the filter capacitor 1 as long as the diode current reaches zero. When enabled, the following pairs of thyristors 7, 8 and the process repeats. The change in the voltage at the load for the period remains constant.

Mode 2. In time, defined by the first and the throttle does not influence the standalone inverter. The reactor 2 has a large inductance and the current through it is almost constant.

The power at the load 17 net loss is equal to the product of input current and voltage. When the operation of the circuit in the first mode, the stabilization of power at the load is due to the voltage regulation due to the fact that the Autonomous inverter operates in generator mode voltage. When the operation of the circuit in the second mode, the voltage change has no significant impact on the stability of power. It is provided by the stabilization of the current, as in this case, the stand-alone inverter is operated in the generator mode current.

Thus, it is an optimization of the charge storage capacitor due to the stabilization of power.

This design scheme of an Autonomous inverter also allows you to adjust the value of the input current through the reactor 2 by means of variation of the firing angle of the thyristors 4 and 5 in the circuit of the inductor 3, which allows you to adjust the output power of the Autonomous inverter.

Stand-alone inverter, comprising six thyristors, the first and second diodes, three inductor, a capacitor, a rectifier element and a storage capacitor that distinguish the ku power, the first to fourth diodes and the third - sixth thyristors connected in circuit single-phase bridge inverter, the diagonal of which is connected to storage capacitor via a rectifier element, one of the inductors and the capacitor included in the diagonal single-phase bridge inverter, and the other two throttle magnetometry, and one of them is connected to the input circuit, and the other has shortcircuited the first and second thyristors.

 

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