SU1221717A2 - Triangular function generator - Google Patents

Abstract

The invention relates to computing and automation and can be used to obtain discrete values of multiphase triangular functions, for example, in multiphase pulse width modulators. The purpose of the invention is to expand the range of the phase shift from 180 to 360. The device contains a pulse counter 1, input 2, 14, 15 and output 4, 10.11 tires, switches 3.8.9, trigger 5, adders 6.7, three-input EXCLUSIVE OR elements 12, 13; the third inputs of the elements 12, 13 are connected to the input buses (n + 1) bits of the input phase shift code 16, 17. Two versions of the device are presented. The first allows you to set the shift of each phase relative to the first, and the second - the shift of each subsequent phase relative to the previous . 3 il. x

Description

The invention relates to computing and automation, can be used to obtain discrete values of multiphase triangular functions in specialized computing devices, as well as in multiphase pulse-width modulators. And it is an improvement of the invention according to the author. No. 1132348.

The purpose of the invention is to extend the range of the phase shift from 180 to 360 °.

Figure 1 shows the structural electrical circuit of the device; Fig. 2 is a structural electrical circuit diagram of a device characterized by a method for setting a phase shift; FIGS. 3 are diagrams for the operation of the devices of FIGS. 1 and 2.

The device comprises a pulse counter 1, the input of which is connected to the first input bus 2, the direct and inverse outputs of the counter 1 are connected respectively to the first and second inputs of the first switch 3, the outputs of which are connected to the first output bus 4, and the control input to the output trigger 5, the input of which is connected to the output of the higher discharge of counter 1. In addition, the device contains the first and second adders 6 and 7, the forward and inverse outputs of which are connected respectively to the first and second inputs of the second and third switches 8 and 9, the outputs of which are connected to the second and third output buses 10 and 11, and the control inputs to the outputs of the first and second three-input elements EXCLUSIVE OR 12 and 13, respectively.

The table shows the input and output states of the three-input element EXCLUSIVE OR.

ten

The first inputs of the MEASURING ORES 12 and 13 elements are connected to the output of the trigger 5, the second inputs are connected to the transfer outputs of the first and second adders 6 and 7, respectively. The second and third input buses 14 and 15 are also shown in the diagram. The third inputs of the EXCLUSIVE OR elements 12 and 13 are connected respectively to the first and second input buses 16 and 17 (n + 1) of the bits of the input code for the phase shift.

In the device shown in figure 1, the first inputs of the first

5 and the second adders 6 and 7 are connected to the forward output of the counter 1, and the second inputs to the second and third input buses 14 and 15, respectively. In the device shown in FIG. 2,

2Q, the first input of the first adder 6 is connected to the forward output of counter 1, and the first input of the second adder 7 to the direct output of the first adder 6. In the devices of FIGS. 1 and 2, direct

25 and inverse outputs of counter 1 and adders 6 and 7, inputs of adders 6 and 7 and switches 3, 8 and 9, input, buses 14 and 15, output buses 4, 10 and 11 are multi-bit digital buses.

The additional control signals and the vf device of FIG. 1 (or the very device of FIG. 2) are (n + 1) -e

35 bits of the phase shift control code Yi HV (or QH).

The device works as follows.

Clock pulses are applied to the input bus 2 (Fig. 3a). In this case, counter 1 counts them, successively passing the state from 00 ... 0 to 11.. . 1. The states of counter 1 are shown in FIG. At the outputs of adders 6 and 7

 codes are generated whose change in time is shown in fig. 3b, d, and the phase shifts are determined by the codes supplied to the input busbars 14 and 15. In the case where the sum

50 numbers supplied to the inputs of the adder, exceeds the maximum number corresponding to the size of this adder, transfer signals are generated (fig. 3d, e). The trigger 5 is switched to the new state after the end of each cycle of the counter 1 (Fig. ZH). In this case, the first output bus 4 is alternately transmitted direct

40

3

and inverse codes from the outputs of the counter-. ka 1 (figm).

The switches 8 and 9 are switched by signals from the EXCLUSIVE OR elements 12 and 13 (Fig. 3k, l). Moreover, the additional phase shift is set by the signals supplied to the input buses 16 and 17 (Fig. 3h, i), which for the device in Fig. 1 are designated fl and H, and for the device in Fig. 2, d f and uvf, respectively. Suppose that at the start of a signal on control buses N or O, and the codes of phase shifts on input buses 14 and 15 are such that they provide a shift of the second phase relative to the first by an angle of about + 34 ° and the third phase relative to the first by an angle of + 68 °.

At time t, the signal on the tires f or U S J takes the value 1 (Fig.C3 ;, which leads to an additional shift of the second phase relative to the first one by 180 °, i.e. the total shift of the second phase relative to the first becomes +214 (FIG. 3N)

Similarly, there is a phase shift at time t ,, when the value 1 receives a signal on the tires “fj and AHVj. The shift of the third phase relative to the first will be equal to +248 (fig.Zo).

21717

If the third inputs of elements

EXCLUSIVE OR 12 and 13 to send signals (n + 1) -th bit y, f or L f, codes of phase shifts f, if

or

dch, respectively, then the phase shift is varied in the range from 0-360 when the codes H, f 2, or lH, and uM j are changed in the range from 00 ... 0 to 11 ... 1.

ten

In this case, in the device shown in Fig. 1, the shift of each phase is set relative to the first one, and in the device of Fig. 2, the shift of each-) 5th next phase relative to the previous one.

Form l., And the invention

2Q Generator of triangular functions, according to author. No. 1132348, characterized in that, in order to expand the range of change of phase shift, additional

25 input buses (h + 1) are bits of the input code for the phase shift, where n is the number of the most significant bit of the phase shift code, each of which is connected to the third input of the corresponding element EXCLUSIVE OR.

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About Ts1Sh1SH.1 MININ walked 111 11 HI 111111 and 11 (

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Editor A.Orap

Compiled by S. Budovich

Tehred V.Kadar Proofreader A.Obruchar

Order 1619/58 Circulation 816 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, Proektna St., 4

Claims (2)

Claim 2Q Triangular Function Generator, Aut. No. 1132348, characterized in that, in order to expand the range of phase shift, it introduced additional 25 input buses of (h + 1) bits of the input phase shift code, where η is the number of the highest bit of the phase shift code, each of which is connected to the third input of the corresponding EXCLUSIVE OR element. FIG. 2 ⁰ Ш11.111111111111111 |||||| ШП |||| ιιιιιιιιιιιιιιιιιιιιιι