SU402823A1 - QUICKLY MOTOR DEVICE - Google Patents

Description

one

The invention relates to the field of phase-measuring technology and can be used to create broadband phase meters.

Known phase-shifting devices containing amplifiers-limiters, triggers and differentiating circuits do not provide phase shifts in a wide frequency range and have low speed.

In order to achieve accuracy and speed, expand the frequency range and obtain a smoothly controlled phase shift, the proposed device is equipped with a cumulative capacity, four keys, a main and additional integrators with time reference chains containing resistance and capacitance, two adders, a comparison circuit and an additional differentiating circuit whose input connected to the output of the comparison circuit and the output of the device, and the output is connected to the second INPUT of the named trigger, the output of the latter is connected to One of the inputs of the first key loaded on the serially connected first adder, an additional integrator shunted by the second key, the second adder, the third key shunted by the storage tank, and the main integrator shunted by the fourth key, the output of which is connected to one of the inputs of the comparison circuit, another input which is connected to the source of the reference voltage, and with the second input of the first adder, while the other inputs of the shunt keys are connected to the output of the main differentiating value, and to others The inputs of the first switch and the second adder are connected to a voltage source.

The drawing shows a block diagram of the described device, comprising amplifier-limiter 1, differentiating circuits 2 and 3, trigger 4, comparison circuit 5, keys 6-9, main integrator 10, additional integrator 11 with a master circuit consisting of resistance 12 and capacity 13, adders 14 and 15, the storage capacitor 16

and the time master circuit of the main integrator, containing a resistance 17 and a capacitance 18.

The device works as follows. Input sinusoidal voltage f / in with

By means of the amplifier-limiter 1 and the differentiating circuit 2 is converted into pulses corresponding to the moments of transition through a zero value. The leading edge of the pulse overturns the trigger 4, opens

switch 6 and closes key 8. This causes accumulation capacitor 16 to recharge by voltage

i.i, s ,,,

where f / puh is the output voltage auxiliary II at the time

The integrator of the end of the period of the input voltage f / Bx / Uo is the reference voltage. The C / output voltage is connected with the input signal frequency / input voltage and the output voltage of the adder 14 t / i dependence

and

where R is resistance 12 and C is capacitance 13. This means that the greater the frequency / in, the lower the voltage t / out, i.e., the greater the difference in voltage U, charging the storage capacitor 16.

The falling edge of the pulse opens the key 8, stopping the charge of the capacitor 16, and closes the keys 7 and 9, discharging the integrating capacitors 13 and 18. After the end of the pulse, the keys 7 and 9 open.

The main integrator 10 begins to integrate the voltage fixed to the storage capacitor 16. When the output voltage of the main integrator L / O reaches the reference voltage level, the comparison circuit 5 operates and the trigger 4 closes the key 6. The additional integrator 11 begins to integrate the voltage difference to the arrival of the next control pulse. The process then repeats. By changing the level of the reference voltage, it is possible to achieve the operation of the comparison circuit for any positive phase shift of the input signal.

Since the voltage level at the storage capacitor is proportional to the period of the input signal, the phase shift will not depend on the frequency / in, and the accuracy of the phase shift will be determined mainly by the sensitivity of the comparison circuit and the stability of the reference voltages.

The device allows you to track the change in frequency over the period of the input voltage, i.e., it is fast. The requirements and linearity of integrator characteristics are low, since the scheme is covered by 100% negative feedback.

Subject invention

A high-speed phase-shifting device containing a series-connected amplifier-limiter, a differentiating circuit and a trigger, characterized in that, in order to improve accuracy and speed, as well as to ensure a smoothly controlled phase shift in a wide frequency range, it is equipped with a cumulative capacity, four keys, the main and additional integrators with time master circuits containing resistance and capacitance, two adders, a comparison circuit and an additional differentiating circuit, the course of which is connected to the output of the comparison circuit and the output of the device, and the output is connected to the second input of the named trigger, the output of the latter is connected to one of the inputs of the first key loaded on the first connected series adder, additional integrator shunted by the second key, second adder, third key, shunted storage tank, and the main integrator shunted by the fourth key, the output of which is connected to one of the inputs of the comparison circuit, the other input of which is connected to the source on voltage,

and with the second input of the first adder, while the other inputs of the shunt keys are connected to the output of the main differentiating circuit, and the source is connected to the other inputs of the first key and the second adder

support stress.