Medium-power and low-cost charge pump charging method

A charging method and charge pump technology, which can be applied to conversion equipment without intermediate conversion to AC, can solve the problems of cumbersome charging system control scheme and high cost of mobile phone charge pump interface chips, and achieve simplified system control scheme, stable charging current, low cost effect

CN111049371AInactive Publication Date: 2020-04-21SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-04-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a medium-power and low-cost charge pump charging method. A SC8551 or lower-cost similar charge pump framework high-voltage direct charging chip is utilized to be matched with acharging head which is commonly used in the market at present and is very low in cost and has a 200mV first-gear voltage regulation range to realize low-power high-voltage direct charging of about 20W-30W. U1 is an SC8551 or Shanghai Hainan core same-series charge pump high-voltage direct charging chip, the USB interface voltage, namely VAC, can be detected in real time, when the voltage of the VAC is higher than the required working voltage, the conduction state of Q1 is controlled through an OVP _ GATE signal, and the VBUS is clamped within the required voltage range. Q1 is an NMOS transistor and cooperates with U1 to perform overvoltage protection of the USB interface and is controlled by U1 to realize isolation of 200mV change of each gear of the low-cost USB input voltage. The cost and the charging efficiency can be well balanced, and the method has great advantages in an interval of about 20W-30W so that the method has very high practical value and promotion value.
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Description

technical field

[0001] The invention relates to the technical field of a mobile phone charge pump charging circuit, in particular to a medium-power and low-cost charge pump charging method. Background technique

[0002] At present, the charge pump architecture high-voltage direct charging chip inside the mobile phone must cooperate with the charging head for precise voltage regulation and current regulation, such as voltage adjustment steps from 20mv to 50mv, and current adjustment steps from 50mA to 200mA. This requires the mobile phone to configure the voltage and current parameters of the charging head by conforming to PPS, SCP, or some communication protocols customized by mobile phone manufacturers. A costly interface chip is needed to realize the control of the mobile phone to the charging head, and the system control scheme is very cumbersome.

[0003] This application is based on a special setting of SC8551 or a similar charge pump architecture high-voltage direct c...

Examples

Embodiment

[0024] Such as figure 1 , 2 As shown, the charging circuit block diagram of a medium-power and low-cost charge pump charging method disclosed by the present invention uses the high-voltage direct charging chip of the SC8551 charge pump architecture to cooperate with the charging of the 200mV first-grade voltage regulation range that is commonly used in the market and has a very low cost. head, to achieve high-voltage direct charging with a lower power of about 20 watts to 30 watts. U1 is SC8551 or the same series charge pump high-voltage direct charge chip of Shanghai Nanxin. It can detect the USB interface voltage in real time, that is, VAC. VBUS is clamped within the desired voltage range, enabling isolation of 200mV of low-cost USB input voltage changes.

[0025] The specific charging method is as follows:

[0026] Configure the working parameters of the charge pump and enable it, and send commands through the USB interface to control the output voltage of the charging h...