The constant current source used in solar garden lights can be classified into three types: boost, buck, and buck-boost. A boost type means its output voltage is higher than the input voltage. A buck type means the output voltage is lower than the input voltage. A buck-boost type can automatically adjust its working mode to either boost or buck according to whether the input voltage is lower or higher than the output voltage.
In solar garden lights, lead-acid batteries are typically used as energy storage devices, with voltages usually being either 12V or 24V. The required output voltage depends on the configuration of the connected LEDs. To ensure that all LEDs share the same forward current, they are usually connected in series, in which case the required output voltage is the sum of the forward voltages of all the series LEDs. For example, if 10 LEDs are connected in series, the total forward voltage would be approximately 10 x 3.3V = 33V. However, since the forward voltage can vary among different manufacturers, the total forward voltage of 10 LEDs may not be the same in every case. In constant current sources, the constant value is the current, not the voltage, so it is unnecessary to know the exact sum of the forward voltages, only whether it is higher or lower than the input voltage.
Therefore, whether using a 12V or 24V battery, a boost constant current source is needed.
If the LEDs used are 10V, 1A, 10W LEDs, then whether a 12V or 24V battery should utilize a buck constant current source. If the voltage of the load approaches the power supply voltage, such as when four 1W LEDs are connected in series, their voltage would be around 13V, while the battery voltage when fully charged would exceed 14V. In this situation, a buck constant current source is needed; however, if the battery is nearly depleted, with a voltage of approximately 10.4V, a boost constant current source would be necessary. Therefore, in such cases, a buck-boost constant current source is employed. Multiple LEDs can also be arranged in a series-parallel structure, commonly referred to as “X in series and Y in parallel.” For example, 10 in series and 3 in parallel would resemble the structure shown in a corresponding diagram.
Bitpott Solar Garden Lights are professionally developed, produced, and sold by manufacturers specializing in solar and LED outdoor lighting, boasting years of production experience and advanced manufacturing equipment. They guarantee quality, reasonable pricing, and optimal configurations. For inquiries about the price of Bitpott solar garden lights, please contact our online customer service.
