SU119899A1 - High-precision compensated constant-voltage stabilizer - Google Patents

Description

The proposed DC voltage compensation stabilizer is a known type of device in which series-parallel-connected semiconductor triodes are used as the actuator, and normal elements are used as sources of reference voltage. A specific feature of the instrument, which reduces the influence of temperature and temporal changes in the parameters of control triodes, is the use of a DC tube amplifier with low drift zero and a high gain factor as a preliminary stage. To match the parameters of the output circuit of the stabilizer with the parameters of the electronic amplifier, there is a transitional circuit on the electron tube, the anode of which is grounded through the base-amitter sections of several cascade-connected semiconductor triodes.

The drawing shows a simplified schematic diagram of the proposed stabilizer.

A normal NE element (one or several) is connected by its negative pole to the high impedance input of a DC amplifier for a DC amplifier with a high gain factor and with a small zero drift. The mode of this amplifier must be such that its input stage operates without or at very low (less than 1 μA) grid currents. In this case, a normal NE element can serve as a source of reference voltage for a period of at least 1 year and keep the voltage constant within ± 0.05%. As the executive body in the stabilizer, powerful re-nos. 119899-2 -

volatile semiconductor triodes T, the voltage drop and the current of which vary depending on the change in the voltage of the input voltage source and the load resistance so that the voltage on the latter remains constant within the appropriate limits. The Rg divider, the voltage on which is compared with the voltage of the normal element NE. The difference of both voltages is applied to the input of the amplifier, it is amplified and affects the regulating elements so that the output voltage U. remains constant within the specified limits.

Since the DC amplifier on the electron tubes has a large gain (50000-100000), even large temperature and temporal changes in the parameters of the regulating semiconductor triodes T do not affect the stability of the output voltage, since these changes are almost completely compensated for by the amplified reverse system connection. In order to prevent significant voltage drops from the tube amplifier of the DCF to the regulating semiconductor triodes T, the voltage of these triodes was eliminated, a transition circuit was used to match the parameters of the output stage of the stabilizer with the parameters of the DCF amplifier. The transitional circuit is assembled on an electronic lamp L, the anode of which is grounded through the base-emitter sections of several cascade-connected semiconductor triodes (T, Ha ...), the last cascade of which are the regulating triodes T. The collectors of the first two triodes TI, TZ, to provide the necessary protection and improvement of the parameters of the stabilizer are connected through protective resistances and 2 with a source of lower and more stable voltage than the voltage U ,,. supply of regulating triodes T. Basically, the collectors of triodes G and Ha can be connected directly to the voltage source. The lamp power supply voltage L is fed to its cathode circuit, and the output voltage from the DC amplifier is fed to its control grid, changing the anode current of the lamp. Since the anode current of the lamp L flows through the base of the triode TI, and the base current of the triode TI determines the final result of the emitter and collector of control triodes T, this thereby controls the current of the emitter and collector of control triodes T. Overload of the UFT amplifier with a certain choice of lamp mode A is safe for the semiconductor triodes associated with it. So, if the voltage becomes negative during an overload, the lamp is locked and the current through the regulating triode decreases. If, on overload, the voltage becomes positive, then the lamp current, and thus the current through the regulating triodes G, takes the maximum value that can be predetermined by selecting the cathode power of the transition lamp or by inserting a limiting resistance R in its control grid The ogre Lamp L simultaneously serves as a phase inverter, providing the necessary phase ratio of the stabilizer.

Subject invention

1. Compensation constant-voltage stabilizer of increased accuracy, using sequentially connected semiconductor triodes as an executive body and normal voltage sources as reference voltage sources, characterized in that, in order to reduce the influence of temperature and temporal changes in the parameters of regulating triodes , as