1. What is the principle of the hand-cranked flashlight
There is no battery in the flashlight. When the flashlight is shaken, the permanent magnet in the flashlight moves in the coil, and the movement is relatively Yes, compared with the permanent magnet, the coil is in the motion of cutting the magnetic field line, so an induced current will be generated, and the current will pass through the light bulb, and the light bulb will emit light.
Second, the schematic diagram of the hand-cranked flashlight
The hand-cranked flashlight is a three-phase alternator that uses high power A device that generates electricity by hand, the electric energy generated by this principle can be used to charge the circuit system of the flashlight by switching the power supply. This kind of flashlight can be used in a relatively emergency situation, not only has the function of being relatively easy to carry, but also has the function of simple structure. In some special cases, it can be used for sudden lighting. Not only that, the power generation of the hand-cranked flashlight can also be used as a backup power of the flashlight to a certain extent.
The schematic diagram of the hand-operated self-generating flashlight is shown in the figure. The schematic diagram of its structure is shown in Figure 2. When using the flashlight, shake the flashlight to make the magnet 7 move up and down, generate electricity through the coil 6, and then rectify through D1-D4 in Figure 2, C1 stores energy to charge the battery CR2032 through the switch control to make the white light-emitting diode emit light. Self-generating function.
Schematic diagram of the hand-crank flashlight
Third, what is the internal structure of the hand-crank flashlight
In the picture, 1 is a cylindrical plastic skeleton. 2 is a white light-emitting diode and 3 is a circuit board. 4 is a switch made of copper sheet. 5 is the reserved CR2032 battery position. 6 is an air-core coil, the inductance is about 33mh, and the wire diameter is about φ.2mm. 7 is a strong magnet, which should be able to move up and down smoothly in the cylinder. 8 is the focusing lens, which is equipped with a rubber sealing ring between it and the plastic frame, which makes the light more concentrated and the range is longer. 9 is a rubber shock-absorbing ring to prevent the magnet from directly impacting the plastic frame. Take the above materials as one piece, and then put it into the plastic torch housing 10 on the right. The sliding switch 11 of the flashlight corresponds to the copper sheet of the circuit board, and then the flashlight cover 12 is screwed on. This torch is ready to use.
We can shake this torch up and down. It just keeps glowing with energy. Due to the use of ultra-bright white light-emitting diodes and lens focusing, the brightness and range are greater than the AA-battery flashlights that only use focusing power. But this flashlight also has a significant disadvantage, that is, it needs to be shaken continuously to continuously emit light. In order to overcome this shortcoming and save costs, we did not use lithium rechargeable batteries to increase energy storage. Instead, connect two CR2032 lithium batteries in parallel at both ends of C1. Practice has proved that since the power consumption of this flashlight is about 30mA, the new battery can be used for a long time, and when the power is insufficient, the flashlight can be used for a period of time. After repeated battery failure, the battery can still continue to work. If your financial conditions permit, it is ideal to replace the battery with a lithium rechargeable battery.
