SU90272A1 - Magnetic Direct Current Relay Medium - Google Patents

Description

As is well known, tube generators operating in re-cycle mode are widely used in automation. They are based on the use of a sharp change in the constant component of the anodic current when the inductance or capacitance of the circulating circuit or the coupling coefficient of the two ontur changes. This change is usually accomplished by moving the capacitor plates (for example, while controlling dimensions) or by introducing a metal screen between the rollers (for example, in thermostats).

Of course, the inductance of the oscillating circuit in the proposed lamp relay is implemented by using a 1 magnet amplifier, introduced into the oscillating CONTROL, supplied by a constant component of the anode current of the lamp.

A feature of this device, which is, therefore, a non-contact direct current relay, is the possibility of using it in automation schemes as a powerful sensitive output relay instead of a series of less powerful intermediate relays.

The drawing shows the electrical circuit of the proposed relay, which is a lamp oscillator, control, which is a magnet amplifier.

Inductance 7, connected between the anodes and the cathode of the lamp, has a constant value, and the conductance 2 between the grid and the cathode is made variable and consists of two windings connected in series, mounted on the outermost rods of the U-shaped core of the magnetic amplifier. The grid of the lamp gets offset from the grid 3-4. The circuit is supplied in parallel, the anode voltage is applied to the lamp through the inductor 5. An actuator 6 is connected to the anode circuit (winding of a power relay, electromagnetic mechanism, etc.). In addition, a feedback winding 7 is connected to the anode circuit. It is shunted by a variable resistance 8. On

The control core 9 and the bias 10 are also located in the middle core of the magnetic amplifier core.

When the variable inductance 2 changes, the feedback factor of the generator changes, np; and with all values of this inductance, greater than its critical value, there are oscillations in the generator, with smaller values, there are no oscillations.

If one chooses the parameters of the circuit in such a way that the inductance 2 acquires values greater and less critical, oscillations in the generator will arise and break down. Thus, the anode current of the lamp will change accordingly.

The operation of the circuit is as follows.

When the current in the mixing / O winding and in the control winding 9 is absent and oscillations are present in the generator circuit, the constant component of the anodic current has a small value, since the grid of the lamp receives a negative offset from the grid. The anode current, flowing through the feedback winding 7, creates a magnetic-induced magnetizing turns of the magnetic amplifier. If you connect the input terminals to a constant source e. d. s., then the current flowing through the control, to it winding 9 amplifier, creates an additional bias.

If the magnetic fluxes of the winding of the feedback pins 7 and the control winding 9 are aligned, then the total bias flux will increase and, therefore, the value of inductance 2 will decrease. Decreasing the magnitude of this inductance will cause a decrease in the generator feedback and, therefore, an oscillatory voltage in the circuit, which in turn will cause a decrease in the negative bias on the lamp grid and an increase in the anode current.

An increase in the anode current will lead to an increase in the feedback bias current and, consequently, to a further decrease in inductance.

When it is over; In the course of the selection of parameters, this question develops like an avalanche and leads to a breakdown of the oscillations and an abrupt increase in the current, just as when the current changes in the control winding in the opposite direction, a sudden change in the oscillation occurs.

Subject invention

Lamp relay intermediate DC, characterized in that for its use in high-power circuits instead of p -. Yes, a relay is applied to a lamp generator | magnetic amplifier, and the sudden excitation and breakdown of oscillations are achieved by applying a positive DC feedback with a constant magnet component of the anode current of the lamp.

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