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Lithium battery charger controlling integrated circuit and constant-current constant-voltage control circuit thereof

A technology of constant current and constant voltage control and integrated circuits, which is applied to battery circuit devices, current collectors, circuit devices, etc., and can solve the problems of large no-load power consumption and long charging time

Inactive Publication Date: 2010-06-02
NANKER GUANGZHOU SEMICON MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this charger is that the charging time is long and the no-load power consumption is large.

Method used

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  • Lithium battery charger controlling integrated circuit and constant-current constant-voltage control circuit thereof
  • Lithium battery charger controlling integrated circuit and constant-current constant-voltage control circuit thereof
  • Lithium battery charger controlling integrated circuit and constant-current constant-voltage control circuit thereof

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Embodiment Construction

[0014] like figure 1 , figure 2 , image 3 As shown, the lithium battery charger control integrated circuit of the present invention includes a charging indication control circuit 2, a short circuit protection circuit 3, a polarity switch control circuit 4, and a constant current and constant voltage control circuit. The constant current and constant voltage control circuit includes lithium Battery positive terminal BT+, power supply input terminal VDD, reference voltage input terminal L1, voltage sampling resistor network 1, comparator OP4, Schmitt trigger circuit SMIT, main charging P-MOSFET P79, switch control P-MOSFET P93, switch control N -MOSFET N72, the voltage sampling resistor network 1 includes a sampling voltage terminal, a voltage dividing terminal T, and a ground terminal, the sampling voltage terminal is connected to the positive terminal BT+, and the voltage dividing terminal T is connected to the comparator OP4 The non-inverting input terminal + of the refer...

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Abstract

The invention discloses a lithium battery charger control integrated circuit with short charging time and low no-load power consumption and a constant-current and constant-voltage control circuit. Thecontrol circuit includes a voltage sampling resistor network, a comparer (OP4), an SMIT circuit, and a main charging P-MOSFET (P79), wherein the voltage dividing terminal (T) of the voltage samplingresistor network is connected with the in-phase input terminal of the comparer (OP4), and the reference voltage input terminal (L1) is connected with the reversed-phase input terminal of the comparer(OP4); the input terminal of the SMIT circuit is connected with the output terminal of the comparer (OP4), and the output terminal is connected with the gates of a switch control P-MOSFET (P93) and anN-MOSFET (N72); the source and the drain of the switch control P-MOSFET (P93) are respectively connected with the output terminal of the comparer (OP4) and the gate of the main charging P-MOSFET (P79); and the source and the drain of the switch control N-MOSFET (N72) are respectively connected with an earth terminal and the gate of the main charging P-MOSFET (P79).

Description

technical field [0001] The invention relates to a lithium battery charger control integrated circuit and its constant current and constant voltage control circuit. Background technique [0002] Currently, rechargeable lithium-ion batteries are commonly used as power supplies in electronic products such as mobile phones, and such lithium-ion batteries need to be charged by a charger. At present, most lithium battery chargers use a variety of dedicated control integrated circuits (IC) and various sampling circuits. Most of the current general-purpose lithium battery chargers use a bipolar operational amplifier (such as LM358) to control a discrete device PNP (such as S8550) to charge the lithium battery with limited voltage. During the charging process, as the voltage of the battery being charged increases, its charging The current keeps decreasing until the voltage of the rechargeable battery reaches its set value (generally, the nominal value is 4.2V). At this time, the cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/04G05F1/46
Inventor 吴纬国范建新
Owner NANKER GUANGZHOU SEMICON MFG