Method for reducing pulse interference voltage at output end of power adapter
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A technology of power adapter and pulse interference, which is applied in current collectors, battery circuit devices, electric vehicles, etc., and can solve problems such as the influence of mobile phone input interface devices, high input voltage of mobile phones, and affecting the charging function of mobile phones.
What is AI technical title?
AI technical title is built by PatSnap AI team. It summarizes the technical point description of the patent document.
A technology of power adapter and pulse interference, which is applied in current collectors, battery circuit devices, electric vehicles, etc., and can solve problems such as the influence of mobile phone input interface devices, high input voltage of mobile phones, and affecting the charging function of mobile phones.
CN102842931BInactive π Publication Date: 2014-12-10GUANGDONG OPPO MOBILE TELECOMM CORP LTD
[0014] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments.
[0015] A method for reducing the pulse interference voltage at the output end of a power adapter, the output end of the power adapter outputs a converted voltage to a small electronic device, and charges the built-in lithium battery of the small electronic device, the electronic device has a built-in charging circuit, the The method steps are as follows:
[0016] Step 1. Set the current gear control command of the charging circuit and write it into the register of the control chip;
[0017] Step 2. During the charging process, the control chip of the charging circuit controls the charging current to drop step by step with a fixed step size S within a fixed time interval T1 to zero amps;
[0018] Step 3. When the charging current drops to zero ampere, start the charging circuit or the voltage detection elemen...
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Abstract
The invention relates to a method for reducing the pulse interference voltage at the output end of a power adapter. The output end of the power adapter outputs converted voltage to small-size electronic equipment to charge an internal lithium battery of the small-size electronic equipment; and the electronic equipment is internally provided with a charging circuit, a control chip of the charging circuit controls the charging current to drop to zero ampere by levels within fixed time duration T1 in a step length S according to a preset current level control instruction at every fixed time interval T so that the voltage of the internal battery is measured. According to the method disclosed by the invention, the current change rate (Delta I / Delta t) is reduced by the current adjusting method, therefore the pulse interference voltage rebounded by circuit output voltage of the power adapter is reduced and the compatibility between the electronic equipment and the power adapter is promoted.
Description
technical field [0001] The invention relates to the technical field of power supply voltage pulse interference, in particular to a method for reducing the pulse interference voltage at the output end of a power adapter. Background technique [0002] At present, mobile phones with lithium batteries generally have a built-in lithium battery charging circuit, and an external power adapter (including power supplies with similar functions, such as charging treasures, car power supplies, etc.) circuits output DC voltage to the mobile phone charging circuit for charging. The existing mobile phone charging circuit generally includes the following charging modes: 1. Low-voltage pre-charging mode - an active charging for the battery voltage is too low. In order to prevent excessive charging current from causing damage to the battery performance, the charging circuit at this time A gradual charging method will be adopted; 2. Full-speed charging mode - or constant current charging mode,...
Claims
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