SU587531A1 - Device for excitation of a thermoemission transducer - Google Patents

Description

The invention relates to a technique for converting thermal energy into Electricity, and more specifically to the direct conversion of heat into elective energy, operating Hai based on thermionic emission and intended for use as a source of electrical energy in space and space.

. Known for various characteristics; improvements for characterization; the know-how of Knudsen thermocouple transducers (TEC).

A device is known for creating a t eiB dimensional magnetic field whose power lines are perpendicular to the planes of the anode and cathode.

The disadvantage of this device is the practical impossibility of its use in full-scale power plants, consisting of a large number (thousand pieces) of elements of TEC which are connected with each other, due to the technological difficulties of their implementation.

It is also known a device for the excitation of TECs containing an excitation source connected to TECs in parallel with the load tzj.

t

The disadvantage of this device is that due to incomplete filtering of the excitation current by the inductance, part of the energy of the excitation source is dissipated on the load and on the inductance, which reduces the excitation efficiency. In addition, the circuit of such a / device does not allow the excitation of a large number of elements: the GoE TEC and use for this purpose - a alternating voltage.

The purpose of the invention is to increase the efficiency of the process of excitation of TEC.

This goal is achieved by the fact that in a known device for excitation of TEC, containing an excitation source included on TEC in parallel with the load, the source is made in the form of an rt-Horct source of an alternating voltage connected to a co-phase transformer, 2n -second windings of which are combined into two stars with neutrals electrically insulated from each other, and each of the secondary windings through a diode and a capacitor in its corresponding neutral is connected to one of the pairs connected through iodine in series with the load

chain of groups of elements of TEP which are in parallel connected among themselves.

The presence of 2 (1-secondary windings and combining them into two stars ensures the use of both half-cycles of alternating voltage. And the presence of a diode between groups of elements connected in series with the load prevents the excitation current from passing through the load.

The possibility of using both half voltage alternating voltage to excite the TEC elements and prevent current flow through the load leads to an increase in the efficiency of using the energy of the excitation source.

The drawing shows a diagram of the proposed device for the excitation of TEC.

The device contains a source of p phase alternating current 1i, 1 P-phase transformer 2c 2n - secondary windings connected in two stars 3, neutral 4 with diodes 5. And capacitors 6., Each secondary winding is connected to groups of paraple-connected TEP 7 elements Between groups of elements connected. In series, a diode 8 is turned on, preventing excitation from passing through the load jcy 9.

The operation of the device is as follows. Each secondary winding of the transformer excites the corresponding TEP group. For example, during one half period of excitation from the left secondary transformer (left star) in the drawing, it passes through a diode 5 / neutral neutral 4, a capacitor. b, the left group of TEP 7 elements to the second end of the winding. During this yluperiod second circuit. The windings of this phase (right star) turn out to be locked with a diode 5 of the right neutral 4. In the subsequent half-period of opposite polarity, the winding circuit of the left star is locked and the winding circuit of the right star opens, and the right group of TEP 7 elements are excited. The capacitors in the neutrals exclude the possibility of passage direct current, generated by TEC elements, through the excitation circuits of the transformer secondary windings. The direction of the excitation current g M of the load current is indicated by arrows in the drawing.

The effect of improving the performance of TEC at the expense of the effect of an electric field on the interelectrode gap of the elements of TEC in the proposed device is similar to the known one. However, preventing the excitation current from passing through the load, the exclusion of inductance coils from cxetAj reduces the power required for the excitation. In addition, the proposed device allows the excitation of a large number of TEC elements, which is important for full-scale power plants.

Formula inventions

A device for exciting a thermionic converter of an applicator containing a source of excitation connected to a thermionic converter: parallel to the load, the result of which is that with a whole of the excitation process, the source of excitation is made as a source of .It -phase alternating voltage connected to a n-phase transformer, 2n -the secondary windings of which are combined into two stars with neutralized electrolyzed from each other, X from each secondary winding through d od and a capacitor in its corresponding neutral included on one of the mutually joined by a diode in series with the load circuit in parallel groups of interconnected elements thermionic converter.

Sources of information taken into account with; expertise

1. US patent 3267307, cl. 310-4, 1963.

2.Information bulletin Direct conversion of thermal energy

in electric and fuel elements Issue 4 (141), 1974, p. 133

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