SU573844A1 - Autonomous inverter - Google Patents

Description

I

The inverter is designed to build power sources of various electrical devices with the conversion of direct current into constant current with intermediate conversion into alternating current with pulse-width control.

DC converters with pulse-width regulation are known, which contain power and quenching thyristors, diodes, a switching capacitor, and an inductance coil (.1

A DC / DC converter, two-stroke, with a transformer load, is known with a pinch-impulse regulation, containing power and switching thyristors, diodes, a switching capacitor and an inductor, as well as a trans (| yurmator, a rectifying bridge and a smoothing filter 2. This converter contains a common to two shoulders quenching circuit, and switching quenching circuit to power thyristors of different arms is carried out by four auxiliary switching thyristors, which leads to

the complexity of the scheme and reduce its reliability and efficiency.

The inverter closest to the invention contains two power thyristors connected by anodes to one of the input terminals and cathodes to the ends of the primary winding of the transformer, the middle output of which is connected to another input terminal, two connected anti-sequential thyristors whose cathodes are connected to the cathodes of power thyristors and to the anodes of counter-connected diodes, as well as a series of switching circuits consisting of a capacitor and a throttle connected to the junction point of the diode s W.

Claims (3)

The disadvantage of this inverter is that for operation when it is turned on, one essential condition must be fulfilled: the switching capacitor must be precharged. Otherwise, the device is inoperable. Moreover, if any malfunction occurs during the operation, which will lead to its discharge, the device will also not be able to continue functioning. The purpose of the invention is to increase the reliability of the circuit. For this, one plate of the switching capacitor is connected to the specified other input terminal; and the second with the point of connection of commuting thyristors. In addition, in order to improve the switching conditions of the thyristors and the conditions of contamination of the capacitance of the dim loop, the input of the battery is shunted by a capacitor. The drawing is a schematic diagram of the proposed Converter. The inverter contains power T1f {k; tori 1 and 2, the cathodes of which are connected to the ends of the primary winding 3 of transformer 4, two commuting thyristors, two diodes 7 and 8, a series circuit consisting of commutating capacitor 9 and throttle 10, and also a capacitor 11 The scheme works as follows. From the control device of the converter, the unlocking pulses in the sequence 1,5,2,6 arrive at the control electrodes of the thyristors, and the time interval between the pulses on the thyristors 1 and 2, and also 5 and 6 corresponds to the half of the period of operation of the converter, and the intervals between the pulses on thyristors and 5 n, respectively, 2 and in correspond to the selected mode of pulse-width control. When the first pulse arrives at thyristor 1, it opens, voltage is applied to the winding arm 3 of transformer 4, and the charge circuit of the switching capacitor 11, 1, 7, 1О, 9 is formed, and the charging process has the (character of one semi-packs, as in the circuit: ar) yes, diode 7 is turned on and capacitor 9 is discharged to double the supply voltage. When the second pulse arrives at the thyristor 5, it opens, to the cathode of thyristor 1, a tensor voltage of 9 times twice the supply voltage is applied, and it closes. After the final discharge, the capacitor 9 over the shoulder of the transformer winding on the circuit 9, 5, 3 and the thyristor 5 also closes. Further, the process occurs similarly for the second arm of the circuit. Since the arms of the primary winding of the transformer are switched on, the transformer alternates both directions in the same period, and a variable impulse voltage with a constant period and pulse duration controlled by the ortho-impulse control is induced at the output winding. The alternating pulse voltage obtained from the output winding of the transformer can be used directly transformed into a constant with the help of rectifiers and filters. Claims of the invention A stand-alone inverter containing two power thyristors connected by anodes to one of the input terminals, and cathodes to the ends of the primary winding of the transformer, the middle output of which is connected to another input output, two connected oppositely commuting thyristors, whose cathodes are connected to the cathodes of power thyristors and anodes of back-to-back diodes, as well as a series circuit consisting of a switching capacitor and others; villages, connected O to the connection point of These diodes are shown by the fact that, in order to increase reliability, one plate of the switching capacitor is connected to the specified other input terminal, and the second one is connected to the connection point of the switching TIRISTPSOV. Sources of information that are taken into account during eco-operation: 1.Sand er A.S., Gustsky Yu.M. Thyristor inverters with a width-impulse modulation for controlling traction motors. M., Energie, 1968, p. 10, rice, 1-7. 2. Romash E.M. Thyristor converters of direct current. M,, Energy 1973 ,. with. 104, 1 pic. 6-8. 3. The second CCQP certificate No. 349069, cl. H O2 M 7/515, 1968. v d i five YU A "