Intelligent dual-mode electric floor brush

An intelligent dual-mode electric floor brush, comprising a control circuit (100) and a floor brush motor (300), wherein the control circuit (100) is connected between a power supply (200) and the floor brush motor (300) to control a work voltage at the floor brush motor (300), and the control circuit (100) comprises:

• a conversion unit (11) that is connected to an output end of the power supply (200) and an input end of the floor brush motor (300) and converts a first voltage of the power supply (200) to a second voltage;
• a sampling unit (13) connected to an output end of the floor brush motor (300), so as to generate a sampled voltage according to a sampled current at the floor brush motor (300);
• a comparison unit (14) connected to the sampling unit (13), wherein the comparison unit (14) is configured to generate a reference voltage and compare the reference voltage with the sampled voltage to generate a switch voltage;
• and
• a switch unit (12) that is connected to the comparison unit (14), the power supply (200), the conversion unit (11), and the floor brush motor (300) and transmits the first voltage or the second voltage to the floor brush motor (300) according to a state of the switch voltage;
• wherein, the conversion unit (11) comprises a conversion circuit (111), a filter circuit (112), and a voltage stabilizing circuit (113);
• the conversion circuit (111) is connected between the power supply (200) and the filter circuit (112), so as to convert the first voltage to the second voltage;
• and
• the voltage stabilizing circuit (113) is connected to an output end of the filter circuit (112), so as to generate a third voltage according to the second voltage;
• the sampling unit (13) comprises a sampling circuit (131) and an amplifying circuit (132);
• an input end of the sampling circuit (131) is connected to a negative electrode of the floor brush motor (300), and an output end of the sampling circuit is connected to the amplifying circuit (132);
• and the sampling circuit (131) is configured to acquire the sampled current from the floor brush motor (300) and amplify the sampled current through the amplifying circuit (132), so as to generate the sampled voltage;
• the comparison unit comprises a reference circuit (142) and a comparison circuit (141);
• wherein the reference circuit (142) is connected to the voltage stabilizing circuit (113) and generates the reference voltage according to the third voltage;
• and an input end of the comparison circuit (141) is connected to the reference circuit (142) and the amplifying circuit, and an output end of the comparison circuit (141) is connected to the switch unit (12) to output a comparison voltage;
• when a voltage value of the sampled voltage is higher than a voltage value of the reference voltage, the comparison voltage is at a high level;
• and
• when a voltage value of the sampled voltage is less than a voltage value of the reference voltage, the comparison voltage is at a low level.