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Charging circuit

A charging circuit and voltage technology, applied in the direction of battery circuit devices, circuit devices, collectors, etc., can solve the problems of cost increase, inductance occupation, large chip area, etc., and achieve the effect of low cost

Active Publication Date: 2016-01-13
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, inductors usually require a large chip area, increasing the cost

Method used

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Embodiment Construction

[0018] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] The term "one embodiment" or "embodiment" here refers to that specific features, structures or characteristics related to the embodiment can be included in at least one implementation of the present invention. The appearances of "in one embodiment" in various places in this specification do not necessarily all refer to the same embodiment, nor do they necessarily refer to a separate or selected embodiment that is mutually exclusive of other embodiments. "Multiple" and "several" in the present invention mean two or more. "And / or" in the present invention means "and" or "or".

[0020] figure 1 It is a circuit schematic diagram of an implementation 100 of the charging circuit in the present invention. Such as figure 1 As s...

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Abstract

The invention provides a charging circuit, which comprises a power transistor, a mirror image transistor, a detection resistor, a current control transistor, a clamping operational amplifier, a constant voltage operational amplifier and a constant current operational amplifier, wherein a first input end of the constant current operational amplifier is connected with a second reference voltage, a second input end thereof is connected with a first connecting end of the detection resistor, and an output end thereof is connected with a control end of the current control transistor. The charging circuit further comprises a charge pump, which is used for boosting an input power supply voltage to obtain a boosted power supply voltage, and the constant voltage operational amplifier and the clamping operational amplifier take the boosted power supply voltage as operating voltage. The charging circuit provided by the invention does not require an inductor, and is low in cost.

Description

【Technical field】 [0001] The invention relates to the field of battery charging, in particular to a low-cost and high-efficiency charging circuit. 【Background technique】 [0002] In the prior art, switching chargers are usually used to realize high-efficiency charging circuits, such as Chinese patent applications (application numbers: CN201110409311.X and CN201110392273.1), which are characterized by the use of inductive elements as energy storage elements to move Energy, to achieve high efficiency, the general efficiency is about 90%. Switching chargers use the principle of inductive energy storage to achieve high conversion efficiency, so that the heat generated on the charging circuit is small. Heat generation has become an increasingly serious problem for devices with small volumes such as mobile phones and Bluetooth headsets. Improving charging efficiency and reducing heat generation can improve circuit reliability. However, inductors usually need to occupy a large c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 王钊
Owner WUXI ZGMICRO ELECTRONICS CO LTD