SU136419A1 - Electronic Voltage Regulator - Google Patents

Description

Known electronic voltage regulators contain a regulating passing lamp, supporting and amplifying elements.

The stabilizer described is different from the known use of a cold cathode lamp as a reference and amplifying element, which simplifies the stabilizer circuit and increases its efficiency (efficiency).

In order to increase the reliability of the automatic cooling of the cold cathode lamp in the ignition circuit of this lamp, a neon light bulb may be used.

FIG. 1 shows a diagram of the described stabilizer with an auxiliary diode; in fig. 2 and 3 - stabilizer circuit with auxiliary lamps.

In the diagram in FIG. 1, the functions of the Zener diode and the amplifier stage are performed by one L-lamp with a cold cathode. In this scheme, L is a pass lamp; D - auxiliary diode. In the diagram in FIG. 2, the auxiliary lamp L serves to obtain a lower output voltage by reducing the voltage on the grid of the lead-on lamp L. In the diagrams of FIG. 1-3, on the anode of the lamp L, a sawtooth voltage is generated, the magnitude of which depends on the unlocking voltage (or current) in the grid circuit of this lamp. If the voltage at the output of the stabilizer increases, the lamp L triggers at a lower voltage at its anode and, therefore, the amplitude value of the voltage at the anode of the lamp L-C decreases. The peak value of the sawtooth voltage appearing in the anode circuit of the Lz lamp charges the capacitor C s through the diode D or the lamp Lh. The voltage across this capacitor controls the conductivity of the lamp L.

An unlocking grid voltage of a cold cathode lamp, usually a number 136419-2 -, is used as a support element.

to ten volts, that is, approximately equal to the reference voltage given by conventional zener diodes.

Both the triodes and cold cathode tetrodes can be used as an amplifying and supporting lamp. For the stability of unlocking voltage when tetrodes are used in the circuit of the first grid of the lamp Dz, an initial current is excited, the high stability of which is provided by the supply of the circuit of the first grid from the output voltage of the stabilizer. The resistance is chosen so that the ignition current of the tetrode or triode does not cause a noticeable voltage drop on this resistance and at the same time avoid the occurrence of a constant discharge between the grid and the cathode. In this case, if lamps are used in which such a discharge is possible, it is artificially terminated by damping pulses appearing on the resistance in the cathode circuit of the lamp L -;.

To reduce the variable component at the output of the stabilizer, the anodic resistance is Ra. Lamps L must be significantly less than the resistance, so that the constant Cs time is many times longer than the constant Ca time and the lamp frequency Lz. It is also desirable to increase the capacitance at the output of the stabilizer. In the diagrams in FIG. 1 and 2, in order to break the discharge after each lamp of the lamp L-l, it was not necessary to apply large resistances, R, the lamp L is extinguished by supplying a sinusoidal voltage 50-400 Hz from the up-winding of a power transformer or other pulse voltage sufficient amplitude.

In the diagram in FIG. 3, the L-lamp is extinguished with a large frequency by the auxiliary lamp L, which spontaneously ignites after charging the anode capacitor Ca through its anode resistance. This method of extinguishing a lamp is a SNG in the same way as the previous one. gives you the opportunity to reduce the resistance values ten times and R To prevent complete stalling with possible simultaneous ignition of the lamps L; and Lz, the anodic resistance of the lamp L is chosen so large that the discharge in this lamp automatically breaks after it has been triggered.

As lamps L and L, simple neon bulbs can be used (for example, types MH-3, MH-6). It is also possible to use cold cathode tetrodes instead of an L lamp, using a second grid as an anode to reduce the ignition voltage and creating a current between the first grid and the cathode to reduce the inertia of the resulting diode.

When establishing the mode, it must be borne in mind that fluctuations in the load on the mains supply cause variations in the voltages at the anode of the lamp L, not exceeding the range of the grid voltages of the transient lamp Lg. However, if a wide adjustment of the output voltage of the stabilizer is required, the lamp L must withstand rather large fluctuations of the anode voltage, approximately equal to the range of variation of the output voltage of the stabilizer, plus the range of grid voltages on the Lg passing lamp.

Since the output voltage is proportional to the unlocking voltage and the ignition current of the lamp L, installing a voltmeter or an oscilloscope at the output of the stabilizer, you can use the described circuit in FIG. 1-3 as a measure of the stability of unlocking voltage and the ignition current of cold-cathode lamps in one mode or another.

Subject invention

1.Electronic voltage regulator containing regulating passing lamp, supporting and amplifying elements, characterized in that, in order to simplify the stabilizer and increase its efficiency, the cold cathode lamp is used as a supporting and amplifying element parallel to the source of a stabilized voltage through a resistance connected through a diode or a second cold cathode lamp with a grid of a regulating lamp.

2. The stabilizer for and. I, characterized in that, in order to increase the power of the automatic quenching of a lamp with a cold cathode, a neon light bulb is used in the circuit of this lamp.

4-0

Sx.

-O 5l / l