Solar Power Generation System Various Control Circuit
Author: Source: Datetime: 2016-09-27 14:13:00
When the voltage of the load machine is controlled only by the solar cell, that is, in a system in which the secondary battery is not used, the Zener diode is connected in reverse to the control voltage of the tarpaulin battery. When the Zener diode is supplied with a reverse voltage, In a voltage breakdown, so the load voltage of the machine will not exceed the voltage; voltage control is to use this principle, it has a small temperature characteristics.With secondary storage battery for solar power portable generator.
Features. The Zener diode sold in the market, the breakdown voltage of a variety of specifications; general work in 1.5 V and 3.0 V and other low-voltage devices using the circuit, it is the diode is still connected with the solar cells, the use of diodes is positive Voltage control of the characteristics of the large-scale integrated circuits such as driving 1.5 V, can be used with a current-voltage characteristics of the gallium phosphide light-emitting diodes for voltage control diodes for light-emitting diodes for even a small current, The forward current characteristics still appear very steep, as the buck is very good, so when a strong light person to the solar cell, the excess energy consumed by the light-emitting diode, the device will not bear more than 1.8V or more Excess voltage, to protect the purpose of large-scale integrated circuits.
Anti - reverse current diode
Sunset night, the solar cell is not light, the output voltage is lower than the secondary lifePo4 battery pack voltage, the secondary battery current flows in the opposite direction to the solar cell, in order to prevent this backflow, during which anti-reflux diode connected in series.
For reverse current diodes, it is desirable that the reverse current (i.e., leakage current) is small, and in particular, it is desirable that the positive voltage drop of the diode on the market is low, and the silicon diode is 0.6 -0.7V, Schottky diodes are 0.2 to 0.3 V, germanium diodes are 0.1-0.3 V. The germanium diode forward voltage drop is small, but the reverse current is large, in fact rarely used. Higher voltage often use low-cost silicon diodes, charge voltage is often lower, but the higher the voltage drop smaller Schottky diodes.
Current control circuit of solar battery power generation system
The charging current is generally controlled by a current limiting resistor, and it is desirable that the charging current can approximately satisfy the relationship of the charging current X charging time X charging efficiency white discharging current X discharging time. On the establishment of the above, can continue to get electricity, but the bad conditions of solar cells are constantly changing, the charging time to accurately predict is difficult, so to prevent the secondary battery overcharge, it is best to let On the right side of the right to get a little bigger and then determine the charge current.Current limit resistance value of the method to determine the maximum light intensity of the solar cell output characteristics of A, access to anti-counter current diode output characteristics after the curve becomes B, then The charging current to the secondary battery of voltage V is such that the current drops to a constant current value I. The circuit resistance required to string R, so we get the characteristic curve C, then, the resistance value of R = V / I is given in this method must be calculated when the charging current, discharge current and charging time, the use of oxidation Silver battery to pay special attention to overcharge, due to oxidation resistance of silver battery overcharging characteristics of poor.
Voltage control circuit
In order to prevent this phenomenon, the voltage of the secondary ifePo4 battery is controlled by a voltage control circuit, and the integrated voltage control circuit is also called an integrated voltage control circuit, and the voltage of the secondary lifePo4 battery is controlled by a voltage control circuit The charging current is almost equal to the output of the solar cell until the full charge is reached, and the charging current is equal to the output voltage of the secondary lifePo4 batteries before the full charge is reached, Current, once reached full charge, due to charge control 1C at first use, the charge current immediately stopped the soil.
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