SU547962A1 - Single channel valve converter control device - Google Patents

Description

This invention relates to a converter. (You can use it to control adjustable rectifiers, inverters driven by a network, and frequency converters with a direct link fc by natural switching of the valves.

Single-channel devices for controlling a valve converter are known, which consist of a form of synchronization pulses, a hedgehog phase displacement unit, and a distributor. The range of control angles is limited to 12 o el. hail.

Also, devices that implement horizontal control with controlled delays are also known. These devices have a delay. Closest to the invention is a single-channel device that performs phase mixing in one control channel, which includes a reference signal generator, a control signal generator, and a comparator. The pulses from the output of the comparator trigger a delay circuit for a duration equal to p. From the output of the first delay starts the "torus, etc." Pulses from the output of the delays

are fed to the corresponding transducer valves.

The known device has the following disadvantages: synchronization is performed with only one phase of the mains supply, in connection with which there is no compensation for oscillations and asymmetry of the phases of the supply voltage; m speed decreases in relation to multispan devices; With variable power supply frequency, the implementation of delay circuits is extremely complex.

. The purpose of the invention is to provide a pulse control impedance and improve the dynamic properties of the valve transducer.

Claims (1)

To do this, in the device: 7 adders, two adders are entered for controlling the converter converter, logic and keys, the control circuits of which are connected through the logic unit to the output of the control pulse distributor, and the key inputs to the source of reference signals, the outputs are connected to the first adder one half of the fault of the keys, and to the second - the outputs of the second half of the keys and the first adder, npVichem the outputs of the second adder are connected to the second input of the comparator. FIG. 1 is a schematic diagram of the apparatuspotcTBa; in fig. 2 - time diagram of work. Device contains voltage source 1, keys 2-7, adders, comparator 10 | The distributor 11 and the logic circuit l2f managed the keys 2-7. The generator of the additional signal associated with the second input of the comparator is not shown in the drawing. The circuit works in the following way. The generator produces voltages according to the mains voltage. Each position of the distributor corresponds to a closed state of two keys. In this case, a reference signal is formed, the amplitude j value of which coincides in time with the moment of the natural unlocking of the force-feeding valves. The keys are sequentially timed in accordance with the signals of the comparator and the switches of the distributor. Thus, npi comes the separation in time of the action of the reference signal (Fig. 2), which form a single signal. This signal is sent to the CC 4parator, in which it forms the coziness | control pulses going to the distributor. Thus, the proposed device favorably differs from the prototype with a high response speed, which is due to its connection with all the phases of the mains supply. The device has a stabilizing effect in case of oscillations and non-metric networks. The absence of fixed delays in the circuit increases the accuracy and allows the device to be used in transducers with high speed transient applications and with power from a network with a variable frequency over a wide range. Claims of the invention A single-channel device for controlling a valve converter containing a source of a control signal; e, a source of reference signals, a comparator, one input of which is connected to a source of a control signal, and a control pulse distributor, in order to ensure symmetry nmp Hols different phage. and improving the dynamics of the properties of the converter, it is provided with data accumulators, logic block and keys, the control circuits of which are connected, through a logic block with the output of the pulse distributor control, and the key inputs - with the source of BURS CIS-. The first half of the keys are connected to the first of the adders, and the second half of the keys and the first totalizer are connected to the second; the outputs of the second half are connected; to the second entrance of the commander. t t t t t t Fj F6 FS fv 6 2 ll eleven Phie.1