SU381165A1 - VOLTAGE CONVERTER IN FREQUENCY - Google Patents

Description

one

This invention relates to electrical measuring technology. The device can be used to linearly convert the DC voltage to the frequency of electrical pulses, when building digital voltmeters, coding transducers, and information-measuring systems.

A voltage to frequency converter is known, comprising a preamplifier, an integrator, a voltage source, a comparator, and an output pulse driver.

The proposed device differs from the known fact that, in order to improve linearity, additional voltage dividers and keys are introduced into it, with one input of the comparator connected to the integrator output through the first voltage divider and to the reference voltage source through the second voltage divider voltage, the second input of the comparator through the third voltage divider and the second key is connected to the inputs of the integrator, the control inputs of the keys are connected to the output of the comparator.

FIG. 1 shows a block c-scheme of the proposed voltage-to-frequency converter; in fig. 2 - timing diagrams explaining the principle of operation of the device.

The output of the preamplifier / connected to the first input of the key 2 and the first input of the integrator 5. The second input of the integrator is connected to the output of the key 4 and the input of the first voltage divider 5. The output and the integrator are connected through the second voltage divider 6 to the first input of the comparator 7, which is connected also to the output of the first voltage divider 5. The second input of the comparator is connected to the output of the third voltage divider 8, and the output to the input of the output pulse shaper 9, the second input of the key 2 and the second input of the key 4. The first input of the switch 4 Inonii yield the reference voltage source 10.

The transformable voltage amplified by the preamplifier / to the voltage {/ I, goes to the integrator 3. The key 2 is open and the key 4 is closed, and the voltage t / Bx through the third divider 8 with the transfer coefficient k goes to the second input of the comparator 7. When the output voltage of the integrator 3 (Umi), passed through the second voltage divider 6 with the transfer coefficient k, reaches the first input

the comparator 7 level k U, given by the third divider H1Amplition 8, the comparator is triggered. In this case, the key 2 is closed, and the key 4 is opened, and the second input of the integrator 3 is supplied with the voltage Lon

with the output of the reference voltage source

10. The same voltage through the first voltage divider 5 with the transfer coefficient R4 goes to the first input of the comparator. The ratio of the parameters is chosen such that the integrator 3 is recharged in the opposite direction. This continues until the voltage at the output of the integrator, having passed through the second voltage divider 6, reaches the first input of the comparator. The level specified by the output voltage of the First voltage divider 5. Thereafter, the Comparator returns to its original state. The voltage drop across the comparator triggers the output pulse driver, the voltage of which is U, and the frequency is directly proportional to the voltage being converted.

In the following scheme works similarly.

Timing diagrams of voltages at the output of the second voltage divider kz / 7, w and

The output of the output pulse shaper BF is shown in FIG. 2

Subject invention

A voltage to frequency converter containing a preamplifier, an integrator, a reference voltage source, a comparator, and an output pulse shaper, characterized in that, in order to improve linearity, additional voltage dividers and keys are added to it, with one comparator input through the first divider the voltage is connected to the integrator output and through the second voltage divider and the first key to the reference voltage source, the second input of the comparator through the third voltage divider and the second key is connected to stroke integrator control inputs of keys connected to the output of the comparator.

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