SU855994A1 - Voltage-to-time inverter converter - Google Patents

Description

(54) FORWARDER CONVERTER & KENYA INTO THE INTEGRAL OF TIME

The invention relates to electrical measuring equipment, in particular, to ana-dary of two-way converters of push-pull integration and can be used in digital voltmeters, measuring systems. The analog-digital converter with a unipolar source is known as the support. Voltage discharger voltage and voltage rectifier in the channel for measuring voltage Uy Cll. The disadvantage of this converter is the conversion error when the signal exceeds the disturbed voltage value of the voltage being converted. The purpose of the invention is to reduce the error of voltage conversion. The set point is achieved in that the voltage converter is a time interval containing an input amplifier, whose input is connected to the input signal bus, and the output is connected via the first key to the integrator's input, the input of which is connected via the second key to the output of the first reference and the output is connected to the input of the comparator, while the start bus is connected to the first inputs of the cycle and trigger triggers, and the trigger output of the cycle is the generator of the duration of the first cycle connected to the second start of the cycle trigger, the output to first connected to the control input of the first key, the inverter, element 2I-NOT, the first and second polarity triggers, the second reference source, and the third key are entered, the inverter input being connected to the comparator output and the single input of the first polarity trigger, and the output connected to the single input of the second trigger of the first frequency, the first zero input of which is connected to the output of the cycle trigger and the first zero input of the first polarity trigger, and the zero input is connected to the second output of the 1shkl trigger and the second zero input of the first trigger polarity, direct output connects to the control input of the third key, and the inverse output is connected to the first input of the element, the second input of which is connected to the inverse output of the first polarity trigger, and the output is connected to the second input of the cycpa trigger, The first trigger of the polarity is connected to the control input of the second key, and the second reference source is connected to the third through a third terminal. integrator input.

The drawing shows a flowchart of transforming the voltage into a time interval. Preophauer contains input amplifier 1 "reference sources 2 and 3, keys 4-6, trigger 7 cycpa, trigger 8 clock, integrator 9, fsrmschzatope Yu duration of the first clock, comparator And, first and second trigger 12 and 13 polarity, element 2I- NOT 14, Inverter 15, Input Bus 16, Run Bus 17, Device will follow: 1gam

in a way.

In the initial state, the keys 4–6 are open, the integrator is 9 bits. Keys 4-6 close when the potential at the control input corresponds to a logical zero, and opens with a logical one. With coming . the trigger pulse triggers 7 and 8 change the state, while the key 4 is closed, the integrator 9 charge starts. The potentials at the first outputs of the triggers 12 and 13 do not change. The comparator 11 is set to the state determined by the polarity of the voltage being converted and, (, by the magnitude of the voltage, the interference by the state of the integrator.

During the first integration cycle, in any state of the inverter and the integrator, the potential of the element 2 and NOT 14 is present at the input of the element 2 corresponding to a logical one, and at the other input at the logical zero. Therefore, regardless of the polarity of the voltage U to be converted, at the output of element 254-HE 14 there is a potential corresponding to a logical unit. The duration of the first cycle of integration of T is determined by the format type 1O of the length of the cycle, which, after an interval of time T from the moment of launch, returns the trigger of the cycle to the initial state. The voltage at the output of the integrator by the end of the first clock cycle of intvgr, swan will be ravio:

0: K5rUx U, SinCu; t4y5flt,

About where is the interference voltage.

The integration is performed taking into account the polarity of the signal to be converted, and the integral of the sum is equal to the sum of the integrals. In the case, if the integration time T is a multiple of the interference period, then

R

(a; t4 (, and L / H-K UxdH kT; ux

After returning to the original condition

the 8 clock trigger, the key 4 is opened, and the second integration clock starts when the integrator is produced. During the second cycle, all the reset inputs of the flip-flops 12 and 13 contain potentials corresponding to a logical unit, the further state of the flip-flops is determined only by the potentials at the inputs of the installation. With a positive polarity of the output voltage of the integrator, the trigger 12 closes, the battery 5 closes, and the integrator starts from the reference source 2. Once; 5th order: the output of the integrator reaches its initial value, the comparator 11, and then the inverter changes states.

Here, the trigger 13 of the polarity changes the state, and the trigger 12 of the polarity remains in the same state. After that, the potentials at the inputs

 that 2I-NOT 14 correspond to a logical one, and at the output - its zero. Element 14 returns the trigger 7 of the loop on the second entry in the initial state. The cycle trigger 7, tilting, returns the triggers 12 and 13 of the polarity on the second zero input to the initial state. Key 6 opens. The duration of the time interval between the flip-flop of trigger 12 and the return in

o The initial state is determined by the delays in the passage of information and can be made small as desired. Duration of the second integration cycle

Tp

equals:

-r x tl

op

Output information is removed from trigger output 12 and 13.

Thus, the device eliminates the measurement error when the voltage of a constant transform voltage Ux is exceeded by a voltage.

Claims (1)

55 claims Voltage converter in the time interval containing the input force