Accurate polarity converter. Scheme, description

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Accurate polarity converter. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Radio amateur designer

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The proposed device (see diagram in the figure) uses an unusual connection of elements of two CMOS microcircuits. On the first of them - DD1 - a pulse generator was assembled, operating at a frequency of about 60 kHz. Its output signal is enhanced by parallel connection of inverters DD1.3 and DD1.4. All elements of the DD2 chip are also connected in parallel. Their inputs and outputs are connected respectively to the inputs and outputs of the inverters DD1.3 and DD1.4 through capacitors C2 and C3. The positive power output DD2 is connected to the negative DD1, and capacitor C2 is installed between the power outputs DD5.

Accurate polarity converter

When an input voltage is applied, oscillations are excited in the generator. Through the capacitor C3 they go to the outputs of the inverters DD2.1-DD2.4. The protective diodes present here form a voltage doubling rectifier that charges the capacitor C5 to a voltage less than the input voltage by the voltage drop across the two diodes. The rectifier of the protective diodes installed at the inputs of the elements DD2 operates in a similar way.

With the advent of the supply voltage, the elements of the DD2 chip begin to work like conventional inverters. At a low logic level at the inputs DD1.3, DD1.4 and DD2.1-DD2.4, their outputs are connected to terminals 14 through terminal p-type transistors, due to which the capacitor C3 is charged to the input voltage. When the logic level is high, the outputs of the inverters are connected to pins 7 through n-type transistors. Capacitor C3 is connected in parallel with C5 and transfers its charge to it. After some time, C5 is charged to a voltage that repeats the input with great accuracy.

The results of the experimental verification of the device are shown in the table. Here UIN is the input voltage, kP is the transfer coefficient, ROUT is the output resistance.

Accurate polarity converter

In the converter, you can use almost any CMOS microcircuits that have inverters in their composition. However, it should be noted that in the K176 and K561LN2 series microcircuits there is only one protective diode in the input circuits, therefore, when using them as DD2, any low-power silicon diode must be connected between the inverter inputs and its positive power output (anode to the inputs). In principle, it is permissible to use one inverter each as inverters DD1.3, DD1.4 and DD2.1-DD2.4. This will not affect the transfer coefficient of the device, but its output impedance will increase.

If pin 7 of DD2 is connected to pin 14 of DD1, and pin 14 of DD2 is used as the output, you get an accurate voltage doubler.

Author: S. Alekseev, Moscow

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