JPS6132506B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tidal flow electromagnetic power generation device that converts the kinetic energy of a tidal flow caused by the ebb and flow of the tide into electrical energy using a magnetohydrodynamic generator.

In this type of power generation device, the direction of the current is approximately 6
Since the polarity is reversed every time, the output polarity of the magnetohydrodynamic generator is also reversed in accordance with this reversal. In other words, the electricity obtained by the generator is alternating current with a cycle of about 12 hours, so when storing this in a storage battery, a full-wave rectifier must be inserted between the storage battery and the generator. However, large-capacity full-wave rectifiers are large and expensive, and have the problem of large electrical energy losses. Also, unlike a normal rotary generator, a magnetohydrodynamic generator has very low impedance, so when its output voltage becomes lower than the terminal voltage of the storage battery, a large current immediately flows from the storage battery to the magnetohydrodynamic generator, causing the storage battery to overflow. There is also the problem of wear and tear.

This invention was made in view of the problems mentioned above.
The output polarity of the electromagnetic fluid generator is detected and the output polarity of the generator applied to the storage battery is appropriately switched, and when the output voltage of the generator falls below the terminal voltage of the storage battery, the connection between the generator and the storage battery is switched. To provide a tidal current electromagnetic power generating device which is capable of smooth and efficient power generation by cutting off energization, has a simple structure and is inexpensive.

Embodiments of the present invention will be described below with reference to the drawings.

In Fig. 1, numeral 11 is a magnetohydrodynamic generator that uses tidal current as an energy source, and as is already known,
A magnet is installed in the sea, a magnetic field is applied in a direction perpendicular to the direction of the tidal current, and electricity is extracted from a pair of electrode plates that are placed opposite each other in parallel to the direction of the tidal current. Therefore, when the direction of the tide is reversed due to the tide phenomenon, the output polarity of the generator 11 is also reversed, and the output voltage, that is, the output terminals 12 and 13 is reversed.
The voltage between them becomes an alternating current voltage with a period of approximately 12 hours, as shown in FIG. Note that when a superconducting magnet is used as the magnet, high power generation efficiency can be obtained.

In FIG. 1, reference numeral 14 denotes a storage battery charged by the generator 11, which is connected to the generator 11 via a voltage adjustment circuit 15 that adjusts the output voltage of the generator 11 so that an excessive output voltage of the generator 11 is not directly applied.
It is connected to the.

16 is a detector set under the sea, 17 is a switching circuit inserted between the generator 11 and the voltage adjustment circuit 15, and when the detector 16 detects the direction of the current, the generator is indirectly activated. 11 is detected, and an output signal from this detector 16 is applied to a switch drive circuit 19 of the switching circuit 17, and this switch drive circuit 19 connects both output terminals 12 and 13 of the generator 11, respectively. One connected changeover switch 21, 22 is driven. Note that the detector 16 may be an electric circuit that directly detects the output polarity of the generator 11 using, for example, a diode.

23 is a comparator that compares the output voltage of the generator 11 and the terminal voltage of the storage battery 14; 24 is the generator 11;
A switching circuit inserted in the charging circuit 25 that connects the storage battery 14 to The output signal is the switch drive circuit 2 of the switching circuit 24.
6, the switch drive circuit 26 opens the switch 27 inserted in the charging circuit 25, and cuts off the electricity between the generator 11 and the storage battery 14.

28 is a load connected to the storage battery 14, and 29 is a main switch inserted in the load circuit 30.

In the above configuration, when the current is directed in the direction shown by the arrow 31 in FIG. 1 and the generator 11 is generating a large positive output voltage shown at point a in FIG.
Among the output terminals 12 and 13 in FIG. 1, the upper output terminal 12 is positive and the lower output terminal 13 is negative. is charged smoothly.

Next, the speed of the current gradually decreases, and the output voltage of the generator 11 decreases as shown at point b in FIG.
When the terminal voltage P of the storage battery matches, the switch drive circuit 26 of the switching circuit 24 receives the output signal from the comparator 23 shown in FIG.
By opening 7, the generator 11 and storage battery 1
4 and disconnect the power from the storage battery 14 to the generator 11.
Prevent electricity from flowing backwards.

The speed of the tidal current further decreases and eventually reaches zero, and the tidal current further reverses and heads in the direction shown by the arrow 32 in Figure 1, causing the generator 11 to generate a small negative output voltage as shown at point d in Figure 2. When this happens, the polarities of the output terminals 12 and 13 in FIG. 1 are reversed, and the lower output terminal 13 becomes positive and the upper output terminal 12 becomes negative. By detecting the reversal of the current, the reversed polarity of the output terminals 12 and 13 is indirectly detected, and upon receiving the output signal from the detector 16, the switch drive circuit 19 of the changeover circuit 17 switches the changeover switch 21, 22 to the position shown by the broken line.

Next, when the speed of the current gradually increases and the absolute value of the output voltage of the generator 11 becomes even slightly larger than the terminal voltage P of the storage battery, as shown at point e in FIG. The output signal of the comparator 23 shown in the figure becomes zero, and the switch 27 of the switching circuit 24 automatically returns and closes, thereby energizing the generator 11 and the storage battery 14. In this state, the storage battery 14 also generates electricity. The device 11 charges the battery smoothly.

As explained above, the present invention is equipped with a switching circuit 17 that detects the output polarity of the magnetohydrodynamic generator 11 and switches the output polarity of the generator 11 applied to the storage battery 14.
Even when going to 1 or 32, the storage battery 14 is always charged smoothly. Furthermore, the switching circuit 17 is smaller and cheaper than a full-wave rectifier, and also has less loss of electrical energy.

Further, the output voltage of the generator 11 is the same as that of the storage battery 14.
When the terminal voltage of the generator 11 is lower than the terminal voltage of the generator 11
Since it is equipped with a switching circuit 24 that cuts off the electricity between the storage battery 14 and the storage battery 14, a large current flows backward from the storage battery 14 to the magnetohydrodynamic generator 11, which has an extremely low impedance compared to a normal rotary generator, and the storage battery 14 The occurrence of problems such as wear and tear is also prevented.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a characteristic diagram of output voltage. 11...Magnetohydrodynamic generator, 14...Storage battery, 15...
Voltage adjustment circuit, 16...detector, 17...switching circuit,
23... Comparator, 24... Switching circuit, 28...
Load, P...Terminal voltage of storage battery.

Claims (1)

[Claims] 1. A magnetohydrodynamic generator that uses tidal current as an energy source,
A storage battery that is charged by this generator, a detector that directly or indirectly detects the output polarity of the generator, and an output of the generator that is applied to the storage battery in response to an output signal from this detector. a switching circuit for switching the polarity; a comparator for comparing the output voltage of the generator with the terminal voltage of the storage battery; A tidal flow electromagnetic power generation device comprising a switching circuit that receives an output signal and cuts off current flow between the generator and the storage battery.