Single-chip microcomputer control circuit with built-in high-voltage-resistant charging management and motor driving circuit

Abstract

The invention discloses a single-chip microcomputer control circuit with a built-in high-voltage-resistant charging management and motor driving circuit. Comprising a single-chip microcomputer kernel, a high-voltage-withstanding charging management circuit, a direct-current motor forward and reverse rotation driving circuit, a digital-to-analog conversion circuit, a timer, an internal RC oscillating circuit, an I / O port control circuit, a static data memory, a program memory and a low-voltage reset / watchdog circuit. A three-in-one single-chip microcomputer chip solution integrating a high-voltage-withstanding charging management circuit, a motor forward and reverse rotation driving circuit and a control circuit is mainly applied to a sound wave electric toothbrush powered by a lithium battery and other products, wireless induction charging and a USB interface 5V charging mode are supported at the same time, and an external charging management chip and a direct-current motor forward and reverse rotation driving chip are not needed. According to the invention, a circuit architecture of a fully-integrated single chip of a chip scheme of a similar electronic product is realized.

Description

technical field [0001] The invention relates to the technical field of intelligent control, in particular to a single chip control circuit with a built-in high withstand voltage charging management and motor drive circuit. Background technique [0002] Because ordinary lithium battery-powered electronic products (such as lithium battery-powered ultrasonic electric toothbrushes) require three separate control circuit chip combinations: external charge management circuit + motor forward and reverse drive circuit + control chip. Ordinary discrete charging management circuits cannot withstand high voltages, cannot support wireless charging, and can only support USB charging. Ordinary discrete motor forward and reverse drive circuits have no overcurrent protection function. There are three conventional solutions: [0003] 1> The control circuit scheme of three discrete chip combinations of external charging management circuit + motor forward and reverse driving circuit + sing...

AI Technical Summary

Problems solved by technology

[0005] 3>Adopt custom ASIC (application-specific integrated circuit), the mode function is fixed and cannot be changed

[0007] 1> The control scheme adopts the combination of external charging management circuit + motor drive circuit + control chip three discrete chips, because three chips are needed for control, the peripheral circuit is more complicated, the failure rate is high, the circuit is complicated, and the overall element of the scheme is affected Component cost, PCB board (printed circuit board) layout and difficulty of production and processing

[0008] 2> Ordinary charging management circuit can not support high voltage, only 5V USB (Universal Serial Bus) charging, can not support wireless charging

[0009] 3> Ordinary motor forward and reverse circuits have no over-temperature protection, and there are many peripheral devices, which affect the layout of the PCB board (printed circuit board) and the difficulty of production and processing

[0010] 4> Ordinary chips cannot use a digital-to-analog conversion circuit (ADC) with a built-in reference voltage source, and there is no low-voltage reminder and charging reminder

[0011] 5>Using customized ASIC dedicated circuit, the mode function is fixed and cannot be changed, the application of different products is not flexible, the stocking cycle is long, and the chip circuit needs to be redesigned to change the function, which is costly!

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