SU124031A1 - Automatic Static Bridge - Google Patents

Description

Automatic bridges of the static system are known, which contain a converter of a ceramic electric quantity into an electric signal, a nonlinear resistance and an amplifier whose input is connected to the measuring diagonal of the bridge, and the output signal affects the change in the nonlinear resistance value.

The proposed bridge provides greater accuracy of conversion with fluctuations in supply voltage. This is achieved by the fact that the output of the amplifier is connected to the diagonal of the power supply.

The drawing shows a schematic diagram of the proposed bridge.

The bridge consists of a nonlinear resistance 1, a converter 2, a non-electric quantity into an electrical circuit, and two ohmic resistances 3 and 4. The measuring diagonal of the bridge is connected to the input of an amplifier assembled on a Tampa 5 or on corresponding semiconductor triodes. Into the anode circuit of the lamp 5, output impedances 6 are inserted, which are connected between the cathode and the grid of the output lamp 7 or between the corresponding elements of semiconductor devices. When you change the parameter being measured, the bridge will become unbalanced. In this case, if a higher positive potential is applied to the grid of the amplifying lamp 5, then the anode current of this lamp will increase, which will cause an increase in the voltage drop at junction 6 and a decrease in the anode current of the output lamp 7, and hence the output voltage Uy Usiocyte. The output of the amplifier is connected to the diagonal of the power bridge. Therefore, when the supply voltage changes, the non-linear resistance (i) will change so as to maintain the equilibrium of the bridge. To obtain at the output of a voltage device proportional to the deviation from a predetermined value, it provides for the compensation of the constant component of the output voltage with the help of a balanced output with a voltage of the DC (s), made in the form of the simplest voltage stabilizer.

The proposed bridge can simultaneously be used as a regulator of various non-electrical quantities. For this purpose, the input of the main amplifying triode included in the offset diagonal of the bridge or on the grid of the additional triode included in the first stage amplifier circuit is given a signal, which is the same as the specified value. When changed; The signal E f but a given law will respond and the output voltage Le will change, which will ensure the temperature of the regulated object according to a given program.

Subject and title

1. Automatic bridge static system. godsrzhasch. a non-electric value converter into an electrical signal, a non-linear amplifier and an amplifier whose input is connected to the measuring diagonal of the bridge, and the output signal affects a change in the non-linear resistance value, characterized in that the output of the amplifier is connected to the diagonal of the bridge power supply in order to capture the accuracy.

2. Automatic bridge for l. 1, characterized in that, in order to increase the measurement accuracy with fluctuations in the supply voltage, the anodic resistance of the output stage of the amplifier is connected between the cathode and the grid of the output lamp or the corresponding elements of the semiconductor device.

3. Automatic bridge but nn. 1 and 2, characterized by the fact that, in order to use it for adjustment, a further triode is applied, connected in accordance with the first stage amplifier circuit, to the grid of which a signal proportional to the specified value is given.