The design principle of the charger

Battery selection

In the design of the whole system, especially in the application of the principle, the overall function of the system battery is to store the electric energy of the solar battery group in the case of light, and release it when the electric energy is lacking. From the point of view of the current battery use of solar electric vehicle, the main selection is lead-acid battery, nickel-cadmium battery or lithium-ion battery, nickel-metal hydride battery, etc. Among them, the specific application effect of the battery to do in-depth analysis, from the continuous working time of the battery, daily discharge, the overall capacity, their own leakage of electric energy and other aspects of the overall design, from the needs of this study, mainly using battery parameters 7.2V/24Ah lead-acid seal battery, a good design and use.

Selective operation of motor

In the type of solar electric vehicle selection, from the use of the situation, there are mainly AC induction motor, permanent magnet synchronous motor and DC motor. From the need of charging system design, all kinds of motors have different characteristics and performance, especially the current use of AC induction motor has the disadvantage of efficiency reduction, and the price of permanent magnet synchronous motor is too high, and DC motor start speed, simple control, very suitable for the needs of the solar battery car, so choose DC motor. Specific control parameters are: working voltage: 4.8-7.2V; No load speed: 0.23 seconds /60 degrees (4.8V), 0.2 seconds /60 degrees (6V). PWM1 and PWM2 change the voltage of the motor by changing the duty ratio.