SU1610566A1 - Device for pulsed phase control of m-phase converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used in control systems of multiphase reversing valve converters with separate control. The purpose of the invention is to increase the reliability of the device by ensuring the safe inversion of kinetic energy into the network. To this end, during the first phase of inverting the electromagnetic energy, when the amplitude of the load current decreases, during the first dead time, the blocking is removed from the switching unit 22, which is switched. The output signal of the unit 22 switches the EXCLUSIVE OR element 21, the output of which closes the key 18 for the time of the inversion of electromagnetic energy. During the second phase of the inversion, the signs of the back emf and the load current are opposite and the output signal of the element 21 switch 18 opens, blocking the influence of the load current on the formation of the output voltage of the device. 2 Il.

Description

The invention relates to electrical engineering and can be used in control systems of multiphase reversible valve converters with separate control (RPC).

The purpose of the invention is to increase the reliability of the device by ensuring the safe inversion of kinetic energy to the network.

Figs 1 shows a diagram of the device; Fig 2 - timing charts of his work.

The device (figo 1) contains in each of the m channels serially connected integrator 1 with resistor 2 and capacitor 3; diodes 4.5 and an additional resistor 6, a comparator 7 and a shaper 8 of the pulse durability, an alternating voltage source 9, the output of which is connected to the input of the integrator 1 s

The synchronizer 10 and the t-phase driver 11, the inputs of which are connected to the network, the phase-shifting element 12, the input of which is connected to the output of the rectifier 11, and the output - to the input of the sampling-storage unit 13, the synchronizing input of which is connected to the output of the synchronizer 10, and the output is connected to the first input of the adder 14, the second input of which is connected to the output of the adder 15, the first input of which is connected to the source of the control voltage, the second to the output of the filter 16, the input of which is connected to the output of the element 12, the outputs of the adders 14 and 15 are connected to first and second the inputs of the adder 17, the third input of which is connected to a constant voltage source, the third input of the adder 14 through the key element 18 is connected to the output of the rectifier 19, the input of which is connected to the output of the load current sensor 20, the control input of the key element 18 is connected to the output the element of the CLAIM TENDER OR 21, the first input of which is connected to the output of the switching unit 22, and the second - to its input and output of the zero-organ. 23 reverse valve groups converter

The device works as follows about

With the arrival at the input of the zero-organ of the reverse of the groups of the signal U (figo2a), at the time t, a signal U appears at its output (, (j (figo2b) and the first inversion phase begins

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J5 20

25 - .c

50

electromagnetic energy, during which the ampere of the load current I i (figo 2c) decreases (t - t).

During the first dead time (time t |), the blocking of the switching unit 22 is removed by the sensor of the state of the valves and the switches of the block 22 (the output signal of which is shown in Fig. 2d) switches

The signals of Tsco (figo2b) and (fig.2g) are fed to the input of the EXCLUSIVE OR 21 element and give the output of the last signal corresponding to figs 2d, the closing key 18 from time t to time t ,, Tooo for the time of inversion of electromagnetic energy

Figo 2e illustrates the second phase of the inversion process (inverting kinetic energy), the interval t ty, the signs Ij and E are opposite to the output signal of the element 21 EXCLUSIVE OR key 18 is opened, blocking the influence of Ij on the process of forming the voltage U "B The right part of Fig. 2 shows: the process of inverting electromagnetic energy (t-, - t, t4 - tg.) when switching to the other gateway to another ground. Such a construction of the device ensures safe inverting of electromagnetic energy when the signs of counter-emf EJ and load current Ij do not coincide, which increases the reliability of, for example, electric drives of metal-cutting machines using .like VIRU and, consequently, the performance of metal-cutting equipment

Claims (1)

Invention Formula A device for pulse-phase control of a g-phase transducer, containing g channels, each of which is designed as an alternating voltage source, the output of which is connected to the input of the integrator, the output of which is connected to the first input of the comparator, the output of which is connected to the input of the pulse width former, the first three-input adder with a precision diode circuit at the output, the first input of which is connected, to the output of the sample-storage unit, the second input to the code of the two-input adder, the first input of which designed for connection to a source of control voltage, a second input through a smoothing filter connected to the output of the phase-shifting element, the first input of the second three-input adder is connected to the output of the first three-input adder, the second - to the output of the three-input adder, the third is intended to be connected to a constant voltage source, the output is connected to the second inputs of the comparators in the control channels, the synchronizer and the t-phase expander, whose inputs are intended for connection to the t-phase mains, the output of the synchronizer is connected to the clock input of the sampling block- stored Yield of n-phase vtr mite- L connected to the input phase shifter element, whose output is connected to the input of sample and hold unit connected in series load current sensor and transducer vshr instant tel, wherein. 0 five 0 that, in order to increase the reliability of the device by providing safe inversion of kinetic energy into the network, a controlled key element was introduced, an EXCLUSIVE OR OR element, a switching unit and a zero-organ reverser of converter groups of inverters, and the input of a zero-organ reverse group of converter groups of the converter was intended for connecting to the signal source, setting the direction of the load current, the output is connected to the input of the switching unit, the output of which is connected to the first input of the EXCLUSIVE OR element, the second input of the cat This is connected to the output of the null organ, the reverse of the converter valve groups, the output to the control input of the controlled key element, the input of which is connected to the output of the rectifier, and the output to the third input of the first three-input adder H