SU1292141A1 - Control device for inverter rack - Google Patents

Abstract

The invention relates to electrical engineering and can be used to control an inverter. The aim of the invention is to increase efficiency. The signals from the inverse output of the master oscillator 1 are fed to the first inputs of the elements 2I – HE 4, 6, and the ac direct output. - to the first inputs of elements 2И-НЕ 4, 6. The output pulses of the divider 2 come to the second inputs of elements 2И-НЕ 3, 4, their frequency determines the duration of the batch of pulses at the output of these elements, which are fed to the power amplifier 7. When switching the divider 2 power amplifier 7 is turned off and there is no signal at the output of the rectifiers 17, 20, 22. The key 23 is closed, the transistor 27 is closed. At the same time, the signals from the outputs of the elements 2I-NOT 5 and 6 include the power amplifier 8. 2 Il. J W Yu UA.S «

Description

112

The invention relates to electrical engineering and can be used in the development of converters of direct voltage to low frequency alternating current for systems of secondary power supply and electric drive.

The aim of the invention is to increase the efficiency by reducing losses in the control circuits and improving the weight and size.

Ffa, FIG. 1 is a schematic diagram of the proposed device; Fig. 2 shows time diagrams of voltages.

The device contains a master oscillator 1, a divider 2 frequencies, elements 2I-NOT 3-6, power amplifiers 7 and 8 with inverting inputs and output transformers 9 and 10. The transformer 9 of the first amplifier 7 is made from the main 11, auxiliary 12 and additional 13 output windings. Similar windings 14-16 have a transformer 10 of the second amplifier 8 and are connected to the main 17 and 18. Auxiliary 19 and 20 and an additional 21 and 22 rectifiers. The main rectifiers 17 and 18 are connected via transistor switches 3 and 24 and the base resistors 25 and 26 to the power transistors 27 and 28.

Fig. 2 shows voltage diagrams of voltages 29 and 30 on the direct and inverse outputs of the master oscillator 1, the output voltage 31 on the direct output of the divider 2, the amplifier control signals 32, 33, the voltage 34 on the output windings of the transformer 9, voltage 35 to the output windings of the transformer 10, voltage 36 at the base-emitter junction of the power transistor 27.

The control device operates as follows.

The master oscillator 1 generates, at the output, rectangular pulses 29 and 30 of a given frequency. These pulses from the direct output are fed to the input of the divider 2 and to the first inputs of the elements

Tone 3 and 5. The signals 30 from the inverse output of the master oscillator 1 are fed to the first inputs of elements 4 and 6. The output pulses 31 of the divider 2 arrive at the second inputs of elements 3 and 4; their frequency determines the duration of a pack of pulses 32 and 33 at the output of elements 3 and 4 that post15

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They fall on the inverting nxojw amplifier 7 power.

The output two-pole voltages 34 and 35 of the power amplifiers 7 and B are shown in FIG. 2. Voltage 34 at time point C, - Cg is supplied from windings 11-13 to rectifiers 17, 20, and 22. Voltage from the output of main rectifier 17 opens at time point c, key 23 and is applied in the unlocking polarity to the junction - the emitter of the power transistor 27. During this time, the transistor 28 remains closed due to the action of the output voltage of the winding 12 applied to it in the closing polarity.

At time t, divider 2 is switched. Power amplifier 7 is turned off and there is no signal at the output of rectifiers 17, 20 and 22. The key 23 closes, the transistor 27 also starts to close. At the same time, the signals from the output of elements 5 and 6 turn on the power amplifier 8, and a voltage 35 is formed at the output windings 14-16. From (the output of the additional and auxiliary rectifiers 19 and 21, the voltage 36 in the closing polarity is applied to the base-to-emitter and the base is the collector of transistor 27, which provides forced locking of it. From the main output winding 14 of amplifier 8, voltage 35 through rectifier 18 switch 24 is applied to the junction of the base - emitter of transistor 28 and opens it. repeats.

In the proposed device, frequency control signals are converted up to 50-100 kHz, while the output frequency can be discretely changed by a frequency divider in a large range without changing the inverter’s weight and size parameters. In general, the frequency of operation of the inverter rack can be varied by using a controlled frequency divider. At the same time, the weight and dimensions of the inverter remain unchanged.

The application of the proposed device allows to increase the efficiency by reducing losses in the control circuits.

312921

Claims (1)

Invention Formula A control unit for a rack-mounted inverter comprising a master oscillator with direct and inverse outputs, first and second power amplifiers and output transformers that contain main, auxiliary and auxiliary windings, with the auxiliary and auxiliary windings of the first output transformer being connected to the inputs of the auxiliary and auxiliary rectifiers , the negative polarity terminals of which are intended for connection to the base, and the positive polarity terminals, respectively, to the collector and the emitter of the lower power transistor, additional and auxiliary. The powerful windings of the second output transformer are designed to be connected in a similar way to the high-voltage transistors of the inverter rack, which is different because, in order to increase efficiency by reducing losses in the control circuits and improving the weight and dimensions of the device, it is X ppppppppppppppppp zg he pop but sapp 0 one five 0 five A14 It is a frequency divider with antiphase outputs, four 2I-NC elements, two transistor switches and two main rectifiers, and the direct output oscillator is connected to the input of the frequency divider and to the first inputs of the first and third elements 2I-NOT, and the inverse - to the first inputs of the second and fourth elements 2I-NOT, the direct output of the frequency divider is connected to the second inputs of the first and second elements 2I-NOT, and the inverse output divisor d is connected to the second inputs of the third and fourth elements 2I-NOT, the outputs of the first and second Elements 2I-NOT are connected to the inputs of the first power amplifier, and the outputs of the third and fourth elements 2I-NOT are connected to the inputs of the second power amplifier, the main windings of the output transformers are connected to the main rectifiers, the positive polarity outputs of which are intended to be connected to the bases, and negative, via additional transistor switches, with the emitters of the corresponding power transistors. ppppppppppppp 1PPG 1PL 3