Water purifier and soft starting method thereof

Abstract

The invention relates to the field of water purification equipment, and discloses a water purifier and a soft starting method thereof. The water purifier comprises a direct-current power supply and a booster pump, a single chip microcomputer, a current-limiting resistor, an MOS (Metal Oxide Semiconductor) tube, a first diode and a second diode, wherein an S pole of the MOS tube is connected with the negative pole of the direct-current power supply; a D pole of the MOS tube is connected with a negative pole input end of the booster pump; the positive pole of the booster pump is connected with the positive pole of the direct-current power supply; the single chip microcomputer outputs a PWM signal; a PWM signal output port of the single chip microcomputer is connected with the current-limiting resistor; the current-limiting resistor is connected with a G pole of the MOS tube; the S pole of the MOS tube is grounded; the first diode and the booster pump are connected in parallel between the MOS tube and the direct-current power supply, and the second diode and the current-limiting resistor are connected in parallel between the single chip microcomputer and the MOS tube. A starting mode of the booster pump is changed into soft starting, thus reducing the starting noise and vibration of the water purifier and prolonging the service life.

Description

technical field [0001] The invention relates to the field of water purification equipment, in particular to a water purifier. Background technique [0002] The reverse osmosis water purifier with RO membrane as the core is currently the mainstream water purification product in the water purification market. The RO membrane used in the reverse osmosis water purifier needs a built-in booster pump to complete the pressurization during the water purification process. The booster pump used is mainly a DC brush motor. As we all know, when the DC brush motor is turned on, it adopts the direct power-on method, and its inrush current is 5-8 times the normal operating current. Frequent inrush current is the main reason for the carbon brush wear of the booster pump. At the same time, excessive inrush current will also cause greater impact noise and impact water pressure, which will not only cause damage to the filter element components of the water purifier, but also cause greater Im...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a water purifier aiming at the disadvantages of high noise and short service life of the booster pump in the prior art

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