SU769515A1 - Method of stabilizing converter direct-current - Google Patents

Description

The invention relates to converting technology and m (ozh (it can be used for pigmenting equipment, ava | ls, avtamapika systems, and high-tech light sources, as well as for charging capacitive airjackets).

A known relay method of stabilizing a constant, ka. At that, the moments of arvcl1OchbN1i, of power lolutrovodnikovyh KLuchey are determined by M) Omentam: And. Achievements. Controlled value of a given level.

In quality: KO-ntrol1Iruvmy 1velichiny. But the voltage on the shunt, connected in series with the load, is used. However, the contact value can be 1 And another value. Palr, Imar, the method of stabilizing IS. And | DC converter is implemented, which consists in stabilizing the maximum value of magnetic induction (shield field) of the throttle of the smoothing filter a 1.

This method .1 Rimen | I1M only; in "onvertar, which have a linear choke. Installed in a variable circuit is ka. The disadvantages of the α-method are 2-3 times the change in the frequency of the intermediate conversion TOiKa when the load is equal to the load of the IC1I and the applied voltage.

The closest of the known methods for stabilizing the direct current of the converter is the method consisting in integrating the throttle current, cpa.BHoi "controlled and predetermined voltage values, forming in the moments of their equality the inverter control signals of the invertermH. Pulses that are consumed from the mains 2.

The drawbacks of the use of the yes1H1NOGO method of stabilizing a constant current. In resonant converters, there is a low accuracy of current stabilization due to the fact that only the lower level of the current is stabilized, and its average change, which varies with the load resistance and the amplitude of the pulsations with a stable lower level. in the wide frequency range of the intermediate current conversion when the resistance of the load and the supply voltage is varied.

- The purpose of the invention is to improve the accuracy of stabilization of the direct current and, 25 stabilize the frequency of the intermediate toia conversion.

The goal is achieved by the fact that the known method of stabilizing the direct current KOHBepTqpa resonant pin, which consists in integrating the throttle current, compares the controlled, and the specified values / voltages, are formed by controlling the thyristors of the converter and 1 of; change the duty cycle of current pulses, Consumer consumption from (Supply 1 network, supplemented by the fact that they generate) - signals of a constant other frequency 1П10Д: Keys iKiOHiB0pTopia to the supply network, measure the result of the specified integration, kadrossel, pqpe Ava, to the load, in the time interval measured from the next time the current consumption of the supplying canopy is used as a result of the specified 1 t t of the rollout value and stop the consumption then: from the supply network at the time of the B-eHCTiBia controlled, and set the value of zheniy .., FIG. Figure 1 shows the time diagrams of currents flowing to the output filter's condensate, and: their integral values are the presence and absence of recovery of the excess energy of the throttles in the power supply and tteinipiepbiiBiHiaM | current of D1ro (cf; wf; i, g 2 is a semi-bridge circuit of a resistor-tuned thyristor 1 inverter With the return of an ergil Drossell IB power source, and Fig. 3 is the same as one of the energy inversion; PA figs: 2; in Fig. 5 - waveform currents and voltages, from the input of the thyristor converter, shown in FIG. 2. Fig. 6 - time diagrams of the currents and voltages of the monvertor, shown in Hia Fig. 3. Thus, the maximum operating mode of the cf. The smaller value of such a capacitor of the output filter is equal to zero, then it stabilizes the .c; and the direct current of the load is equivalent to stabilizing the average for the half period of the value flowing through the droplet filter in the aperture of the source and in the perfume (/ Wed) By definition. / / 2 2 to - Wed y - -; where T is the durability) period of the alternating current; t is the duration of the current flow of 1–1 drossel droplets: voltage from the source to the load during each half period; I is the instantaneous value of such a winding; q is the charge of a single current pulse; / n - CURRENT on | Shipment. From formula (1), it follows that in order to stabilize it; and direct current, it is necessary to stabilize it; | the current conversion period —And charge impulse, tare. At the same time, both the current form and the value of the supply voltage. The ki and the load resistance K | And do not affect the stability of the constant load current. This method of current stabilization can be carried out with intermittent and continuous flow of current in the collar of throttles during a half-period .; In both cases, the time t Prek, the consumption of energy is growing from the power source. At ET01M, in the first case, the energy stored in the throttle returns to the SOURCE of the power supply and it receives IB 1 load, ku, and in this case all the power of the other filter is transferred to the load. With the discontinuous form of the winding of the droplets of the filter, its value is less than half a period and is important for any reasonably fast changes in the supply voltage and load resistors. When this type of current is unprovided, this current P1roceos stabilizes it, and its magnitude occurs with delay in a few 1 times / 15 riads. However, in the latter case, the power switches and implementers of the power inverter are used better, xaiK - as: there is no consumption of excess energy from the power source and its return to the source | I1K. Let us consider the implementation of this method in a half-bridge resonance in a trisristb.rnnom yoshvertore with the form of the winding of the choke's intermittent current intermittently (see Fig. 2). The converter consists of a control circuit including a master oscillator / voltage phi1K | Oirov; of a given frequency, rectifier / 2, for example, and. 3, the threshold element 4, / the first part. Thyristors 5 and 5 are included in the power section of the converter, through 1kot0 | rye flows from the iHiainpy.3Ke istuyuchyka, and the heuristor 7 of the regeneration current, the choke 8 with three revolutions of MOT1k1mi 9, 10 and //, and the mucous coupling detector 12, transformer 13, rectifier 1 current 14 and output capacitive filter | p 15. A load 1, ka 16 is connected to the output of the 1 envelope 10 | p. 16. There is a voltage converter from the source of pasta with an external voltage of “O.” In order to improve the current stabilization, a shunt 17, a source of a suitable power source, for example, a power supply 18 and an amplifier, and a voltage amplifier 19, which serves to trigger the threshold element, is introduced. The stabilization of the pastoral load current (in this converter is carried out by stabilizing a1M ac voltages t / c on the switching capacitor 12, which is equivalent to stabilizing the charge imiULBSOB perimeter that. The validity of such a stabilization, ci1, is proved by the equation fl with what: d (;, 1- | w about Sl1d respectively: -C n - / cf

If Af7c const; r ioonst “C iconst, TO /„ const.

If the colors are changed, then the value of the stabilized East / Non current will also be replaced.

In the quasi-settled mode of operation, there are three Suiches, namely, different stages of the ipH bots (see Fig. 4).

During the neipiBOro stage, the current of the thyristor 5 | And the winding of the nineteen juniors 8 and the ameno lto is oo | IU | to the ideal law and p, pO1XO | DIT its maximum z.n: pupils.

This is also the case. There is a reloading of the communicating handler 12 from -and to -bL / cj ,. The stage comes to an end, when the voltage of the communicating joints reaches the specified inqporoBoro value (CST. At this moment, the second stage begins, through the thyristor 5 .Repro1K (pa: schayae, the control signal enters and -a thyristor 7, KOToriy The voltage accumulated in the other assembly 8 through the winding 11 returns to the source of titanium. The voltage on the primary winding of the transistor 13 becomes equal to | Zero, the voltage on the commutator of the indenter 12 is permanent and paeiHO t / cii thyristor current 7 and necropsy 11 droplets 8 1spa. gives according to the linear law od action voltage HCTO4, HKKa power.

At the time of the termination of the flow of current through the thyristor, the 7th stage is at the 3rd stage. At this stage, through the tors. Converters of the converter does not flow, the voltage on the COM1mut: capacitor 12 is constant C / s "Filter capacitor 15, discharger 14 14 is discharged" and into the bulk 1 / 1b.

Mepiea time interval 0.5 T control signal is applied to the thyristor 6 and all processes are repeated.

On 01.cyl.pra1M max (ohm. Fig. 5), the shapes of current (IBX) and regeneration current (ipM) and the charging port for the switching I / O device are shown in diagrams shown in fig. -g. 2, in Kotarom there were no nodes / 7- / 9. Vozmozh "aa.l; isa.p; and this method of stabilization and in the circuit 1 of the converter, Fig. 1nto 1 on fig. 3

, Scheme a consists of a master generator, genre 1, vy1n: pYaM1tel- 2: and a divider nfpoct 3, controlling nqpoirasHiM elements: М 4, frequency divider 20, main 27 and 22, and 23 t and 23 nistors,. Commutating capacitor 25, commuting Drossel 26, 1silo: trans1H1oforLMaTOpa 27, power rectifier -28 s. fil-iipoM 29.1 on the load (ki Sp.

The main thyristors 21 and 22 control with signals of a phyou | ia frequency from the master oscillator 1. The control signals receive aa auxiliary thyristors 23 and 24 moments when the voltage is on you. during the delimiter; voltage 3, proportional to the voltage across the k-Ωm capacitor 1M capacitor 25, reaches the pickup voltage of threshold element 4. Temporary diastams, which show the operation of the converter, are shown in FIG. 6. Since the interval between the times of feeds and onboard spans at the auxiliary machines for alternating thyristors 8 and 9 make up the half-frequency of the voltage conversion and the average for such a filter period, the filter capacitor 14 equals zero, the magnitude of the current of load 15, given to the transverse winding trans -. The factor 12 is determined by equation (3), where 2AL / f is equal to twice the major value of the adapter and the condenser 25.

.. In FIG. 2 and 3 resonant thyristor converters always have a com municating accelerator, an ACCELERATING element, an intriver TOJC of primary 1–5 windings.

T e chnico e.nocomix e cs shim of the substance of the proposed method of stabilizing the dc converter current is increased in the AI of the accuracy of the stabilization or dc of the current at a given level of pulsations and in the frequency of the intermediate current conversion. In addition, in devices that implement this stabilization method, stability is increased, since the control filter is excluded from the closed-loop | Adjustment Loop.

Claims (2)

1. Copyright witness of the USSR .№ 437055, G 05 F 1/46, 1974. . 2. Bulatov, O. G., et al. Thyristor Schemes of Inclusion, high: n; those-nsi V (New Sources of Light. M., Energii, 1975, p. 110-117 - (garotype). + jes1 about su28 0 (rig.Z FIG. five -and pf