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Seat type charger plan

A technology of chargers and solutions, applied in current collectors, electric vehicles, electrical components, etc., can solve problems such as increased cost and complex structure, and achieve the effects of cost reduction, simple structure reduction, and full utilization of power supply capacity.

Inactive Publication Date: 2005-08-03
苏颖耿
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a solution uses an analog chip as a peripheral device of a single-chip microcomputer, which has a complex structure and increases the cost

Method used

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  • Seat type charger plan

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Experimental program
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Embodiment Construction

[0011] figure 1 Among them, U1 is a single-chip microcomputer. The power input is a mobile phone supporting travel charger: output 5VDC maximum current 500mA. The reference voltage Vb is 4.2V formed by DW1, R7, R8. When the battery voltage, reference voltage measurement and battery detection are performed, the P52 port of U1 outputs a low level to cut off the battery charging control transistor Q1 and stop charging. When measuring the reference voltage, first set the P62 port as an input port, and the four ports P61 / P64 / P66 / P67 as an output port and set the low level to make D2 / D3 / D4 in the reverse cut-off state; then set the P61 port Set it as an input port and start timing until P61 reads a high level. This conversion time is inversely proportional to the voltage. Use the same method to measure the conversion time of the battery voltage. Comparing the battery conversion time with the reference conversion time to obtain the battery voltage value, if the battery voltage is...

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PUM

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Abstract

This invention discloses a plan for controlling mobile phone Li-ionic battery seated charger by single-chip processor. The primary voltage is equal to the Li ionic battery charging ending voltage, the target measurement voltage is isolated and selected by four diodes, and the voltage value is tested by RC charge method, different duty-ratio pulses are applied for charging based on Li-ionic battery voltage value, the battery is cut-in from positive and negative double points to detect if a battery exists by testing if the positive cut-in point corresponding to the negative is free.

Description

technical field [0001] The invention relates to a lithium-ion battery seat charger scheme for a mobile phone controlled by a single-chip microcomputer. Background technique [0002] Currently on the market, there are mainly three circuit principle schemes for the in-line chargers for charging lithium-ion batteries of mobile phones. The first scheme uses a comparator or operational amplifier for charge control. A precision reference voltage device, a comparator or an operational amplifier, and a triode or a field effect tube are used to form a charging termination voltage. After the battery to be recharged is connected, if the battery voltage is lower than the charging termination voltage, current will flow into the battery to charge it. As the charging progresses, when the battery voltage rises to close to or equal to the charging end voltage, the current flowing into the battery is extremely small. Connect the sampling resistor in series in the charging current loop, use ...

Claims

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Application Information

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IPC IPC(8): H02J7/04
Inventor 苏颖耿
Owner 苏颖耿