The utility model discloses a kind of battery efficient charging circuit of
solar lamp, including photovoltaic panel, battery, photovoltaic panel is connected with photovoltaic detection circuit, anti-inversion circuit, anti-inversion circuit is connected with half-bridge synchronous step-down circuit, half-bridge synchronous step-down circuit is connected with battery;Photovoltaic detection circuit is connected with single-
chip microcomputer, single-
chip microcomputer is connected with anti-inversion circuit, half-bridge synchronous step-down circuit, current detection electrical appliance,
battery voltage detection circuit;When the product works, single-
chip microcomputer can automatically calculate the optimum power point of photovoltaic panel according to current photovoltaic panel
voltage and
battery voltage, single-chip microcomputer exports the waveform of corresponding
duty cycle to half-bridge synchronous step-down circuit, then battery is charged by half-bridge synchronous step-down circuit, so that photovoltaic panel energy is transmitted to battery with optimal efficiency, compared with only
diode charging mode, 50% can be improved 60% charging current, let battery have higher efficiency
voltage charging, to improve charging efficiency;Meanwhile, after being fully charged, current can be prevented to photovoltaic panel.