Deploying converter

 

(57) Abstract:

The invention relates to the field of automation and can be used for control of technological processes. The technical result is to increase the accuracy. The device contains a source of control signal, adder, integrator installation input, relay element, an inverter, a sawtooth generator, a key element of the RS-trigger element and NOT a one-shot. 6 Il.

The invention relates to amplifying devices with pulse-width modulation and can be used in the automation of technological processes.

Known deploying Converter (RP) that contains the integrator, a relay element, transformer, filter resistors (and.with. N 758178, 1980, b. I. N 30).

The disadvantage of this RP is the dependence of the frequency of its output pulses from the magnitude of the input signal.

Known RP - prototype (Tsytovich L. I., Maurer C.,, Tsytovich P. L. pulsewidth integrating deploying the Converter circuit of the amplitude correction of the dynamic characteristics, Instruments and experimental techniques, 1997, No. 3, S. 89-93), containing (Fig.3) self-oscillating cascade-based adder 1ASS="ptx2">

The disadvantage of RP-prototype is a long transition process changing the phase synchronization of the sawtooth voltage. This is displayed by the charts of the signals in Fig. 4-6.

If no signal (Fig. 4) RP is in synchronism with the signal "saw" Yp(Fig.4), which is amplitude modulation thresholds b0switching unit 3. The output signal of the integrator Yandhas a sawtooth shape with a constant component (Fig. 4B), depending on the frequency ratio of the signal Ypand their own self-oscillations RP. The output of block 3 pulses of Ypzero DC component (Fig. 4B). When you synchronize the TL signal "saw" with a descending character of the linear plot (Fig. 4A, 0 < t t0), the rear edge of the signal Yp(drop + A - A) is fixed in time, and the position of the leading edge depends on the magnitude of the information signal. Suppose that at time t0(Fig. 4A) occurred invert signal "saw".

In this case, the reorientation of the RP, when reversing the sign of the DC component of the signal Yp(Fig. 4B), the output of block 3 (Fig. 4B) pulses, which fixyou/SUB> (Fig. 4A) allows, for example, to simplify the control system reversible thyristor Converter, in particular, during the transition from the rectifier to the inverter bridge-group. This principle, however, control the TL has a significant drawback. Suppose that the change of sign of the signal Ypoccurs when a non-zero value of the control signal (Fig. 5). Given the different rate of change in voltage Yandthe attached transformation cycles (Fig. 5B) in the ER for several periods of the clock signal Yp(periods of the mains voltage) collapse of the regime switching relay unit 3 (Fig. 5B, in, t < t0) because the function b(t) and Yand(t) have no common solutions. Moreover, it should be noted that this transition does not depend on time t0the change of direction of scan Yandthat is illustrated by diagrams of the signals in Fig. 6, where t0(Fig. 6A) is arbitrary.

Thus, RP-prototype is characterized by low accuracy when changing the sign of the clock signal.

The basis of the invention is the technical problem of reducing the transient time when the change in the sign of sync with the tel contains consistently included source control signal, the adder, integrator installation input and relay element, the output of which is connected to the output terminal and the second input of the adder, the sawtooth generator, synchronized with the mains voltage, the output of which is connected to the input of the inverter and to the normally closed contact of key element, normally open contact which is connected to the inverter output, RS-flip-flop S-input of which is connected to the command input with the input element, the output of which is connected to the R input of RS flip-flop, the output of the RS flip-flop is connected to the control input of a key element, the output of which is connected to a second input of the relay element, and differs from known deploys Converter the fact that it introduced the one-shot, whose input is connected to the command input and the output to the input set "zero" integrator.

The essential difference this RP is a little transition time. The goal of the project is achieved by setting the zero initial conditions in the integrator at the time of the shift clock phase.

The invention is illustrated by drawings, where Fig. 1 presents a functional diagram of the SPM, and Fig. 2 - temporary viloobrazno signal 4, the inverter 5, the key 6, the one-shot 7, item NO 8, RS-trigger 9, the information input 10, the clock input 11, a command input 12 output 13.

The adder 1 has a unit gain for each of the inputs and connected to the input of the inverter 2 with transfer function

W(p) = 1/Tp

Relay element 3 is made with reinvestiruja the hysteresis loop and symmetric with respect to the "zero" threshold switch. The generator 4 is synchronized with the network and generates the output signal "saw" with a linearly falling and discrete fronts. Unit 5 inverts the sign of the output signal generator 4. Key 6 at "0" at the output of the block 9 is in the state shown in Fig. 1. When "1" at the control input key 6 switches and the normally open contact closes. Unit 7 generates a pulse of low and stable duration synchronously with edges of the signal at the input 12. Thus the integrator 2 is set to "0". Unit 9 becomes "1" when S = 1 and R = 0. In the case of S=0, R=1 output trigger signal 9 is "1".

In Fig. 2 shows:

Yp- output signal generator 4;

b0the thresholds of the switching relay element 3 in the absence of the generator 4;

b(t) - the act changes the thresholds of block 3 when the modulation signal
Y0- output signal of one-shot 7;

t0- time inverting the sign of the signal Yp;

XIsignal control.

The principle of operation of SPM next. The generator 4 is synchronized with the network that provides the formation of the output of SPM pulses similar frequency and increases the immunity of the device to interference from the power source. In the initial state of the sawtooth signal from the output of the generator 4 is linearly decreasing and discrete fronts (Fig. 2A, t < t0). The trigger 9 is in the state "0", because the input 12 filed "0". The output of the generator 4 through the normally closed contact of key 6 is connected to the second input of the relay element 3, which leads to modulation of its thresholds on the law of the clock signal (Fig. 2A). In the absence of the control signal at terminal 10 output 13 SPM pulses "meander" with mean zero. Under the action of the control signal (Fig. 2B) the sweep signal at the output of the integrator 2 is shifted to the vertical relative to the zero level, which in turn changes the duty cycle of the output pulses RP (Fig. 2B, C). Falling edge of the output signal RP is fixed in time, and the position of the leading edge depends on ve the ger 9 is set to "1". To the second input of the relay unit 3 is fed from the output of the inverter 5 is inverted by the sign signal "saw" (Fig. 2A). At the same time starts the one-shot 7 (Fig. 2G) and resets the integrator 2 (Fig. 2B). Thereby saving time transition in the ER (Fig. 5), which passes into the operating mode, when fixed at the time the leading edge, and in PWM mode is rear front output pulses RP. The inclusion of block 7 eliminates the static state of the SPM in the transition process, which increases the accuracy of the device compared to RP prototype.

The present invention is used in the system of pulse-phase control reverse thyristor Converter.

Deploying Converter comprising sequentially enabled source control signal, adder, integrator installation input and relay element, the output of which is connected to the output terminal and the second input of the adder, the sawtooth generator, synchronized with the mains voltage, the output of which is connected to the input of the inverter, characterized in that it introduced the RS-trigger element, a one-shot, the inverter and the key element to a normally closed contact which polyken to the output of the inverter, S-input of the RS flip-flop is connected to the command input of the Converter and to the input element, the output of which is connected to the R input trigger output RS-flip-flop is connected to the control input of the key element, the output of which is connected to a second input of the relay element, the input of one-shot connected to the command input, and the output connected to the input of the zero of the integrator.

 

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