LOW-LIGHT SOLAR BOOST CONVERTER AND CONTROL METHOD THEREFOR

摘要

The present disclosure provides a low-light solar boost converter and a control method therefore. The control method comprises the boost converter starting to operate in a PWM mode; determining whether the voltage of the input terminal is larger than a reference input voltage, the boost converter operating in the PWM mode when the voltage of the input terminal is larger than the reference input voltage, otherwise the boost converter operating in a burst mode, wherein a burst time period of the burst mode increases when the voltage of the input terminal decreases; during the burst mode determining whether the voltage of the output terminal is less than a first preset output voltage, the boost converter operating in the PWM mode when the voltage of the output terminal is less than the first preset output voltage, otherwise the boost converter operating in the burst mode.

主权项

1. A low-light solar boost converter having an input terminal and an output terminal, the input terminal coupled to a solar energy receiving unit, the output terminal coupled to a load, the low-light solar boost converter comprising:
a boost converter, coupled to the input terminal and the output terminal; a pulse width modulation controller, coupled to the boost converter, providing a plurality of pulses to the boost converter for adjusting the voltage of the output terminal, wherein the pulse width modulation controller operates in a PWM (pulse width modulation) mode when the voltage of the input terminal is larger than a reference input voltage, the pulse width modulation controller operates in a burst mode when the voltage of the input terminal is not larger than the reference input voltage, a burst time period of the burst mode increases when the voltage of the input terminal decreases; and a switching controller, coupled to the pulse width modulation controller, determining whether the voltage of the output terminal is less than a first preset output voltage, wherein the switching controller controls the pulse width modulation controller to operate in the PWM mode when the voltage of the output terminal is less than the first preset output voltage, the switching controller controls the pulse width modulation controller to operate in the burst mode when the voltage of the output terminal is not less than the first preset output voltage.