LONG LIFE BATTERY-If there is no reading on the voltmeter
After the circuit board is manufactured, connect all the switch contact leads according to the schematic diagram.A single-pole single-throw toggle switch can be connected in series in the positive lead to control the on-off of the circuit.In this way, in order to cut off the current from the power supply, it is not necessary to remove the circuit board from the sunlight.Set the installation according to the drawings?, rural pole to connect the opposite, electricity is impassable.
One can only measure 1?The 13V voltmeter is connected across the positive and negative terminals of the power supply. During debugging, it is best to connect the rotary switch contact and the solar cell connection points with the lead wire with alligator clip. After confirming the correct voltage contact, replace the lead wire with the lead wire of alligator clip, weld the lead wire, turn Si to 12V position, and place the solar cell panel under bright sunlight or artificial light.Make sure that each solar cell receives substantially the same light.When the switch is in the 12V position, the reading on the meter should be around 12V.This value may be very close to 12.3 volts.If the reading on the meter is less than 12V, add more solar cells in series.The voltage generated by some solar cells is not necessarily exactly 0.45 volts DC, and 0.45 volts is the normal average output voltage.
Turn Yao to the 1.5V DC position and read the voltmeter value.If a standard battery is used, the reading should be 1.55 volts.The measured values mentioned all take into account that DX is connected to the circuit.If there is no connection in the circuit, the output voltage should be slightly higher to continue turning si and check all the voltage output so that the voltage output of each gear conforms to the values listed in the figure.The advantage of using the lead with alligator clip is that the connection point of each section of the solar cell can be easily changed to adjust to the required voltage output.
If there is no reading on the voltmeter, it may be disconnection, switch damage or polarity reversal, or it may be one polarity reversal in the solar cell.If the DC 1.5, 3.0 and 4.5 volt crotch output voltages are normal and the 6.0 volt range has no voltage output, there is a bad battery or a battery polarity reversal between the DC 4.5 volt and 6.0 volt battery strings.When the polarity of a certain battery is reversed or damaged, there will be no voltage output when the switch rotates past the battery.
This solar power supply can provide different operating' currents for a variety of low-power electronic circuits.If a small solar cell element is used, the device can be made portable in order to meet the needs of outdoor activities.
4 - 64 solar powered TV set
This section is the last design project in this book. It is expensive and rare.It directly uses sunlight to power the TV receiver.Some TV receivers have batteries inside, which can be charged by sunlight.But solar cells are auxiliary.Television receivers are powered by solar-charged batteries, not directly by solar energy.
The trick of this project is to choose a TV set instead of the solar power author @ 4 - 79 Sinclair mini TV set that can be held in his hand, with the solar power on the ground solar cell ( 14 "
Flat @ @ section
PC. M 400 mA Solar Cell D?- peak reverse voltage 50v, " * -. -
Electric throw 50V - 1A diode
( for battery charging ).
（-）？< + ) to 6v socket of TV set
Figure 4 - 80 Schematic Diagram of Solar Power Line
In order to minimize the cost of solar power, a British - made Sinclair miniature television receiver was selected, which can be conveniently held in hand, as shown in Figure 4 - 79.The reason for choosing this TV set is that it needs less power and can be powered by 12v car battery or 6v DC battery with a current slightly less than 400ma.
Figure' 80 is a schematic diagram of a 6 volt power supply.The picture shows a protective diode connected, and the output voltage of 14 solar cells is slightly higher than 6V DC.Almost all the solar cells bought have no leads, so they have to be soldered after they are bought.Figs. 4 - 81 show the front side of the solar cell with the negative electrode lead welded.The welding work is very meticulous, because solar cells are easily cracked before they are properly installed.During the welding process, the broken pieces can be reassembled with transparent adhesive tape on the back of the pieces, and at the same time, a thin wire must be welded to the two pieces / to maintain electrical connection.
Figs. 4 - 82 show the installation of solar cells.The round foam gasket was glued to a 13x9 inch cardboard sheet, and then glued to a 14x10 inch plywood sheet 1 / 4 inch thick.The whole assembly is contained in a small wooden box.Since the experiment is now in progress, the solar cell does not need to be permanently fixed on the plexiglass.This simple installation method is to facilitate changing the connection of wires and rearranging the solar cells.Figs. 4 - 83 show the whole solar power supply device.Obviously / this is a temporary installation, but it still has a good electrical mounting pad
Figure 4 - 82 Performance of Solar Cells Installed on Hard Paper Jam and Packed in Wooden Boxes.After the battery leads are connected, stick the battery to the foam rubber gasket and install it temporarily as shown in fig. 4 - 82.The voltage of 13 solar cells connected in series should be 6V.If a diode is connected to the circuit, 14 solar cells are recommended.
After bonding, the long wire between the battery and the battery can pass through the cardboard and then be bonded with epoxy resin.The plastic insulator is used to lay the wire on the hard paper flat to prevent the wire from creating G shadow A on the surface of the battery and finally connecting the 6V power cord to the output wall of the solar battery power supply so that debugging can be carried out. From the above introduction, the power supply seems to be easy to manufacture and can be completed in about three hours.Sometimes people will find that the seemingly easy thing is not to succeed at one stroke, and the author has had such experience.I tuned a TV set with a built-in 12V battery to a nearby TV station and put the solar battery pack in bright sunlight. When the plug of the solar battery power supply is plugged into the 6V plug hole of the TV set, the TV set immediately stops working.After pulling out the plug, the TV will start working again by using the built-in battery.Using a voltmeter to check the output of the solar cell power supply, the voltage is indeed 6V.Bustard plugged the plug into the TV plug hole and the TV stopped working.The author discovered this & due to the addition of a plastic ring to the plug hole, the solar cell power supply shown in fig. 4 - 83 was generated
The plug cannot be completely plugged in.After removing the plastic ring, the plug can be fully inserted into the plug hole. At this time, the TV will continue to work as if it were powered by a built-in battery.In order to find out whether the solar cell actually supplies power to the TV, a piece of thick paper can be used to block the light shining on the solar cell. If the TV stops working at this time, and when the screen is removed, the TV will resume working again, indicating that the power is indeed supplied directly by the solar cell power supply.Figs. 4 - 84 are photos of TV sets and solar power supply devices, compared with TV sets that are much smaller than solar power supply devices.
Photo: Miniature TV and Solar Power Supply
TV sets powered by solar energy are exactly the same as those powered by batteries, with no difference in image or sound.During the debugging process, it was found that even when the yaoyang is covered by thin clouds, the solar cell can still supply power to the TV set. When the light is dim to a certain level, the image will disappear first, then the light will darken again and the sound will disappear.
It is of great practical value to use solar power to supply power for TV sets.In the field where there is no conventional power supply, solar power is very suitable.In the daytime, the TV is powered by solar power, and in the evening, the battery in the TV can be used for power supply.Solar cells can use the raging campfire to provide enough working current for TV sets.But be careful?If the solar power source is too close to the fire source, the solar cell will be quickly heated and damaged.