SU1465895A1 - Scanning converter - Google Patents

Abstract

The invention relates to amplifying devices operating in an auto-oscillatory mode, with a pulse-width conversion of a signal. The aim of the invention is to improve noise immunity. The spreading converter contains the first, second and third isolation transformers 1, 2 and 3 with the first and second windings 1, 2, 3, and 1, 2, 3, the first, second and third current-limiting resistors 4, 5 and 6, the first, second and third relay blocks 7, 8 and 9, the first, second and third diagnostic blocks 10, 11 and 12, the first, second and third switches 13, 14 and 15, the first, second and third coupling capacitors 16, 17 and 18, fourth, fifth, and sixth switches 19, 20, and 21; zero potential bus 22, first, second input buses 23 and 24, output 25, total EXAMPLE 26 Povsh1enie noise immunity is achieved by operating the second and third isolating transformers 2 and 3 in the saturation mode the magneto | trunk wire. silt

Description

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This invention relates to an amplifier device operating in a self-oscillation mode with an orot-pulsed signal conversion.

increase of number

The purpose of the invention of resistance.

Figure 1 shows the functional diagram of the ratter transformation; l; Fig 2 - timing charts of signals.

In Figs. 1, the first, second, and third separation transformers 1-3, the first windings 1, 2, and 3., the second windings 1, 2, and 3., the first, second, and third current-limiting resistors 4-6, the first , the second and third relay blocks 7, 8 and 9, the first, second and third blocks 10, 11 and 12 of the first fault, first, second and third switches 13, 14 and 15, the first, second, second and third dividing capacitors 16 , 17 and 18, fourth, | The 1 st and sixth switches 19, 20 and 21, the bus 22 of zero potential, the first and second input buses 23 and output 25, the adder 26, the proportional-differentiating element 11 and the demodulator 28. I Blocks 10, 11 and 12 diagnostics-. and they are made in the form of connected proportional-differentiating element 27 and demodulator 28.

The first, second, and third relay bridges 7, 8, and 9 are filled with an inverting hysteresis loop with ± V trip thresholds, the code of which changes discretely within

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I The operation of the switches 13-15 and 19-21 occurs when there is a signal 1 on their controlling inputs. The summator 26 has a unit transmission factor. The second and third relay blocks 8 and 9 have a blocking input. The action on which signal 1 ensures that the relay unit switches to the Static state + A independently (the presence of a signal at its information input.

In Figure 2, the following is indicated: R (t) is the resistance of the signal source connected between the first and second input buses and 24, Y (t) the output signal of the first ry block unit 7j Y (t) is the voltage Hia of the first limiting resistor 4j Yj ( t) - output signal proportional-differentiating element

25

0

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,five ,"

five

ment 27; Yg (t) is the output signal of demodulator 28, Yg (t) i Y, (t) is the output signals of the second and third relay blocks 8 and 9, t ,, t are the moments of time of change of the input signal.

The sweep converter works as follows;

The converter contains three identical self-oscillatory channels. The first consists of the first isolating transformer 1, the first current limiting resistor 4, the first relay unit 7, the second channel consists of the second isolating transformer 2, the second current limiting resistor 5, the second relay unit 8, the third channel. transformer 3, third current-limiting resistor 6, third relay unit .9. The first channel is working, the rest is backup.

The monitoring of the health of the channels is carried out using the first, second and third blocks 10–12 of the diagnosis,

Consider the work of the first self-oscillatory channel.

When enabled, the first relay block 7 is set to USB. from stable states, for example + A (FIG. 2U). Under the action of a signal, the voltage on the first current-limiting resistor 4 changes — in the positive direction as long as the condition

Y / t)

(one)

which leads to the switching of the second relay unit 8 to the opposite state - A (Fig. 25). The process of magnetization reversal of the first isolation transformer 1 begins, which lasts until

YT (t) 6B,

(2)

The first relay block 7 is switched again and the process is repeated. As a result, at the output of the first relay unit 7, a bipolar signal of the meauvdr type with a zero value averaged over the sampling interval is formed.

The proportional-differentiating element 27 transmits the variable component of the output pulses of the relay units with almost no distortion (Fig. 26). 27 demodulor signal

3

Ya (t) (Fig. 26) is also rectified at. If necessary, it is additionally filtered (Figure 2d). Thus, a signal 1 is generated, indicating the operation of the corresponding auto-oscillatory channel.

When the first self-oscillatory channel is working, the signal

the second winding 12 is at idle. The constant time of the first isolation transformer 1 is greatest, and the frequency of self-oscillations is minimal (Fig. 26).

In the interval t, –c t: t (figo2o) R (t) is small and the second winding is 1 shunt-kolotoatel canal. ... n ..., Ruets first. the separator of the first block of the diagnostic unit 16, which translates the first CDLAi M i „i., ,,,„, ttla CG LPPMYaTPP 1 I D EIM

Neither 10 is fed to the blocking input of the second and third relay blocks 11 and 12 and forcibly fixes them in the static state + A (Fig. 2).

Thus, the operation of peseipBHbix channels in a self-oscillating mode in a number of cases is inexpedient, since it impairs their reliability indices. Obviously, if the goal of a high availability reserve is not pursued, then its operation in a static state is desirable.

Secondly, separation transformers 1-3 are receivers of electromagnetic impulse noise, which under certain conditions can lead to failure of the input circuits of relay blocks 7-9. During the operation of the second and third drainage units

-.

8 and 9

the wires of the second and third isolation transformers 2, 3 and the input resistance of the backup channels are sharply reduced. This entails an improvement in their noise immunity and reduces the likelihood of malfunction due to external interference.

When the second and third relay blocks 8 and 9 are fixed in the + A state, the output of the second and third diagnostic blocks 11 and 12 is zero. Switches 14, 15, 20 and 21 are in the states shown in Fig. 1, and the closing contacts of the first and fourth switches 13 and 19 are closed, connecting the first self-oscillating channel to the input buses 23 and 24 and to the output 25.

Resistance to separation end 15

divider transformer 1 in short circuit mode. The time constant of the integrator, which plays the role of separation transformer 1, decreases and the frequency of the pulses f (t) increases (Fig. 25).

The principle of operation of backup channels at zero signal level is. The output of the second and third blocks 11 and 12 of the diagnosis is the same.

Suppose: that the first relay unit 7 went into a static state due to a fault. In this case, the signal at the output of the first diagnostic unit 10 takes the value O, and the first and fourth switches 13 and 19 are switched to the initial state, which is shown in Fig. 1.

No input voltage

25

iporo and third and pc 1sppv1l. l.

the magnetically saturates before blocking the second relay unit

. .... l n.v 4rj-tm f fxi1lXt3l, TV I DF PKP.

causes a regime of stable self-oscillations in the second cycle and the appearance of 1 at the output of the second diagnostic unit 11. As a result, the input buses 23 and 24 and the output 25 are connected to the second self-oscillating channel. Output 1 through the adder. 26 fixes the first relay block 9 in the + A state, thereby preventing the third channel from operating in self-oscillating mode. In the event that the second self-oscillating channel is inoperable, the output signal of the adder 26 is zero and the third self-oscillating channel i is turned on in operation.

Higher noise immunity is achieved due to the fact that the second and third separation transformers 2 and 3, which perform the function of an integrating element, operate in the mode 40

45

The capacitors 16-18 for the frequency of auto -..., - -the oscillations are small, and their functional on the whole of the magnetic pipe.

 the value is to eliminate the constant component from the input source on the second winding of the isolation transformers 1-3;

Claims (1)

Claim Invention Deploying Converter e containing the first, second and third separation transformers, the first and second terminals of the first winding of each of which are connected respectively to the information input and With a sufficiently large R (t) value (Fig. 2a, t-ct,) the first separation transformer 1 is from the side 5895 g of the second winding 12 is idling. The constant time of the first isolation transformer 1 is greatest, and the frequency of self-oscillations is minimal (Fig. 26). In the interval t, -c t: t (figo2o) R (t) is small and the second winding 1 is shunt-on 16, which translates the first „i., ,, ,,„, ttla ЧГ ЛППМЯТПП 1 Я D ЕЖИМ divider transformer 1 in short circuit mode. The time constant of the integrator, which plays the role of separation transformer 1, decreases and the frequency of the pulses f (t) increases (Fig. 25). The principle of operation of backup channels at zero signal level is. The output of the second and third blocks 11 and 12 of the diagnosis is similar. Suppose: that the first relay unit 7 went into a static state due to a fault. In this case, the signal at the output of the first diagnostic unit 10 takes the value O, and the first and fourth switches 13 and 19 are switched to the initial state, which is shown in Fig. 1. No input voltage “. blocking the second relay block a blocking the second relay block a . .... l n.v 4rj-tm f fxi1lXt3l, TV I DF PKP. causes a regime of stable self-oscillations in the second cycle and the appearance of 1 at the output of the second diagnostic unit 11. As a result, the input buses 23 and 24 and the output 25 are connected to the second self-oscillating channel. Output 1 through the adder. 26 fixes the first relay block 9 in the + A state, thereby preventing the third channel from operating in self-oscillating mode. In the event that the second self-oscillating channel is inoperable, the output signal of the adder 26 is zero and the third self-oscillating channel i is turned on in operation. Higher noise immunity is achieved due to the fact that the second and third separation transformers 2 and 3, which perform the function of an integrating element, operate in the mode .., - - “all the all-magmatic lines. Claim Invention Deploying Converter e containing the first, second and third separation transformers, the first and second terminals of the first winding of each of which are connected respectively to the information input and the output of the corresponding relay Vok, the output of each diagnostic unit is connected to the output of each relay unit, the first output of the first winding of each of the isolation transformers is connected via a corresponding current limiting resistor to the zero busbar JBoro, the first output of the second winding of each of the isolation transformers is connected the first plate of the corresponding separation capacitor is the first, second and third switches, the output of the first relay unit is connected to the closing contact The first switch, whose switch contact is the output of a turn-off fipe switch body, the first switch open contact is connected to the secondary switch of the second switch, the close contact of which is connected to the output of the second relay unit, the second switch breaker connected to re: the third contact of the third switch, the closing contact of which is connected to the output of the third relay-block, the third contact of the switch connected to the bus zero the potential, the outputs of the first, second and third diagnostic units are connected to the control inputs Dami, respectively, of the first, second, and third switches, the adder, To the first and second inputs of which 0 five 0 five 0 five Outputs of the first and second diagnostic units, respectively, are connected, in order to improve the noise immunity, a fourth, fifth and sixth switches are introduced into it, and the disconnecting contact of the fourth switch is connected to the switching contact of the fifth switch - whose contacts are connected to the switching contact of the sixth switch, the disconnecting contact of which is connected to the zero-potential bus, the switching contact of the fourth switch is the first input another deployment converter, the second input bus of which is the connected second outputs of the second windings of the first, second and third isolation transformers, the closing contacts of the first, second and third switches are connected to the second plates of the first, second and third coupling capacitors, respectively, the output of the first diagnostic unit is connected to to the control input of the fourth switch and to the blocking input of the second relay unit, the output of the second diagnostics unit n with the control input of the fifth switch, the output of the third diagnostic unit is connected to the control input of the sixth switch, the output of the adder is connected to the blocking input of the third relay unit. at rft) Wf) g a about t FIG. 2