SU1251269A1 - Device for controlling three-phase transistor inverter - Google Patents

Abstract

The invention makes it possible to increase the reliability of a device for controlling a three-phase transistor inverter due to the fact that the inverter transistor control signals are generated by a logic circuit in which the summation of analog signals by using transformers is eliminated. In this case, the logic circuit is made in accordance with the equations, Q2V QiQsVrQ QftVVQ, Q, Qe QiQjVQ Q vTQ QjVtQiQi, Q, Q, Q, VQ ,,, Q3, where Qg. Q, are the output signals of the specified control logic circuit, Q, is the output signal of the generator 18, Q., Q, Q are the output signals of the distributor, f is the control signal. 2 Il. (Ls ate to odd with

Description

The invention relates to a converter technique and can be used in low-power electric drive systems.

The aim of the invention is to increase reliability.

FIG. 1 shows a diagram of a converter device; in fig. 2 diagrams., Explaining his work.

The three-phase inverter contains the power transistor bridge I-6, and the inverter control device is output amplifiers 7.8 and 9, the control unit of preliminary output amplifiers consisting of elements 10.11 and 12 AND-OR-NOT, the distributor 13 with the first , the second and third outputs 14, 15 and 16, the control signal inverter 17, the master oscillator 18 with the direct and inverse outputs and the control input 19 of the device.

The distributor 13 consists of two 1K-triggers 20 and 21 and the element 22 AND-OR-NOT.

The output amplifier control unit consists of three elements 10, AND, 12 AND-OR-NOT. The outputs of elements 10, I, and 12 are phasewise connected via amplifiers 7, 8 and 9 to the bases of power thyristors, i.e. the output, for example, of the element 10, related to the first phase, is fed through the amplifier 7 to the power transistors 1 and 2, which also belong to the first phase. Similarly, they are connected to power transistors. Elements 1t and 12.

To the input of every third element AND (if counted from top to bottom in FIG. 1) of each of elements 10.11 and I2, direct Q is connected, and to the inputs of the first, second and fourth elements And the inverse Q outputs of the master oscillator 18.

The first output 14 of the distributor 13 is connected to the inputs of the first and third elements AND element 10, the fourth element And element 11 and the second element And element 12.

The second output 15 of the distributor 13 with the inputs of the first and third elements And element 11, the second element And element 10 and the fourth element And element 12.

The third output 16 of the distributor 13 is connected to the inputs of the first and third elements AND element 12, the fourth element And element 10 and the second element And element 11.

Input 19 directly and through the inverter 17 is connected to the inputs of the third and fourth elements And each of the elements 10,11 and 12. - 5 The device operates as follows.

Elements 10,11 and 12, perceived signals from the outputs of the master oscillator 18-Q, the distributor 13-Q, O Q and Q, input 19-, form the signals Qg Qg and Q (Fig. 2) according to the following laws:

Q5 QiQjVQ QjVJ Q Q VfQ, Q,

, Vq ,, g, vfQ, q,

 5 Q.Q, Q.Q.Q2VyQ ,, Q3.

The logical works that are included in these formulas are formed by the elements AND, which are included in the elements 10,11 and 12 (see 20 Fig. 2).

The signals Q5, Qg, Q, are fed to the inputs of amplifiers 7,8,9.

When the corresponding power transistor is turned on, the load phase 25 of the inverter is either connected to one of the power supply terminals or shorted.

As a result, phase voltages (for example, UA in Fig. 2) are generated on the load as mono-polar pulses of the control signal J for each half-period of the output frequency, which ensures minimum ripple of the load current at the frequency of this signal .

To simplify FIG. 1 diodes, shunt transistors in the opposite direction, not shown.

35

40

45

The inverter transistor control signals are generated by a logic circuit, in which the summation of analog signals by transformers is eliminated, which greatly simplifies the device and increases its reliability and noise immunity.

Formula of invention

50 A device for controlling a three-phase transistor inverter, comprising a master oscillator, the output of which and the input of the device for connecting a control signal are connected

55 with inputs of an output amplifier control unit, the outputs of which are connected via output amplifiers with terminals for connection to the transit base

The inverter transistor control signals are generated by a logic circuit, in which the summation of analog signals by transformers is eliminated, which greatly simplifies the device and increases its reliability and noise immunity.

Formula of invention

A device for controlling a three-phase transistor inverter, comprising a master oscillator, the output of which and the input of the device for connecting a control signal are connected

with the outputs of the control unit of the output amplifiers, the outputs of which are connected through the output amplifiers with the terminals for connection to the bases of the inverter's transistors, so that, for the sake of reliability, it is equipped with a pulse distributor, the input of which is connected to the output of the master oscillator, the output is connected to the inputs of the control unit of the output amplifiers, and the control unit of the output amplifiers is made in accordance with the equations

251269

Q.Q,

L, where Q.

to

QjVQ, Q3VyQ, Q, vyQ, Q, Q, VTQ, Q, VTQ, Q,. Q4VQ ,, Q, Qg, Q, - output signals of the specified block; .Q, is the output signal of the master oscillator; Q. Qjj Q - output signals

distributor; Y-control signal ,,

Claims (1)

Claim A device for controlling a three-phase transistor inverter containing a master oscillator, the output of which and the input of the device for connecting the control signal are connected to the inputs of the control unit of the output amplifiers, the outputs of which are connected through the output amplifiers to the outputs for connecting to the transformer bases of the inverter, In addition, in order to increase reliability, it is equipped with a pulse distributor, the input of which is connected to the output of the master · generator, the outputs are connected to the inputs of the control unit. amplifiers, and the control unit of the output amplifiers is made in accordance with the equations ^v Q, Q ^ vYQ _< Q _s vtq, Q _i ,. Q ^ AvQ, QM <W, Q _s , where Q _s , Q ₆ , Q _? - output signals 5 of the indicated block; Q, is the output signal of the master oscillator; Q ^, Q ₃ , are the output signals of the distributor; 10 ¥ - control signal. figure 1 I I I Qi q ₂ q * q ₄ ---- " L __ ^ LS] PPPLPPPPPPPPPPPPPPPPPPPPPPPP _> schlapppplshshllpppppppppppppppppppp * Γ ~ Ί I— _χ g Ϊ QiQz * QiQ ₂ X Qi Q ₄ Qf> Q ₅ Qi Q ₃ Qi Q ₄ XQ1Q3 XQiQ? Qs Qi Q ₄ Q1Q2 XQ1Q4 XQ.Qs q ₇ __P.PPT spike LDPR sppg [shish 1PSh1 LIPP e · »> hs 1PLPG 7: ι SHIPE [mu ΙΠΓ. shnsh ------------- er "_ ππππ then