SU453751A1 - Phase sensing device - Google Patents

Description

one

Phase-sensitive devices are known, which contain two intermediate transformers with two secondary windings connected in one circuit of the circuit, upstream, and in the other according to, and two rectifiers operating on one load.

In order to increase sensitivity and reliability in the proposed device, the secondary windings of one transformer are made with middle points, and the other is divided into Two equal parts, which are connected in series with the windings of the first transformer symmetrically relative to the middle points of these windings, and each of the rectifiers is made on two zener diodes .

FIG. 1 is a diagram of the described device; “And FIG. 2, a and b - rectifier switching circuits.

The device contains intermediate transformers 1 and 2. The secondary windings 3 and 4 of one of the transformers have terminals of middle points, and the secondary windings 5 and 6 of the other transformer are divided into two equal parts and connected in series with secondary windings of the first transformer symmetrically with respect to the middle points. Rectifiers 7 and 8 in each circuit are made on two zener diodes. Outputs 9–10 and 11–12 rectifiers can be switched on in series with the load (see

FIG. 2, a) and counter-parallel (see Fig. 2, b). To improve operation, rectifiers can be additionally loaded onto ballast resistances.

With small levels in each half-cycle of input signals, each rectifier conducts in the forward direction only one zener diode. As a consequence, the internal voltage drop, differential resistance and the number of semiconductor elements in the proposed device are two times less than in known devices, which provides a higher threshold sensitivity and reliability, lower consumption and higher efficiency.

Thanks to the proposed switching on of the windings and zener diodes as rectifiers, the operation mode of the device is also improved in a wide range of input values, in particular, the exclusion mode, when at equal secondary e. d. one rectifier operates in the normal mode, while the other opens all the diodes that follow the load, which has room in known devices.

In the mode of higher signal levels, overvoltages, or pulse signals, in addition to the two zener diodes conducting in the forward direction, the other two zener diodes can operate in the stabilization mode. In connection with

With this, the output voltage of rectifiers in any normal or emergency mode, as well as during surge overvoltages, cannot exceed the previously known voltage determined by the Zener reference voltage, therefore there is no need for additional limiting and protective elements. The device circuit also has high noise immunity and electrostatic pickups.

Subject invention

Phase sensitive device containing two intermediate transformers with

two secondary windings connected in one circuit to a counter, and in the other according to, and two rectifiers operating on one load, characterized in that, in order to increase sensitivity and reliability, the secondary windings of one transformer are made with middle points and the other are separated into two equal parts, which are connected in series with the windings of the first transformer symmetrically with respect to the midpoints of these windings, and each of the rectifiers is made on two zener diodes.

FIG. one

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