Light-load detection circuit
A detection circuit and capacitor technology, applied in the field of circuits, can solve the problems of increasing the complexity and cost of the detection circuit
Active Publication Date: 2021-01-29
上海芯导电子科技股份有限公司
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] In the prior art, a differential operational amplifier is usually used to detect the voltage difference of the sense resistor to detect the load current, thus requiring the use of an accurate external sense resistor and a pin, which will increase the complexity and cost of the detection circuit
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0031] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.
[0033] The invention provides a light-load detection circuit, such as figure 1 shown, among others:
[0034] A...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to the technical field of circuits, in particular to a light-load detection circuit which comprises a power supply voltage end; a delayed charging module, wherein the input end of the delayed charging module is connected with the power supply voltage end, and a charging current is formed after a preset first delay time; a counting reset module, wherein the input end of the counting reset module is connected with the output end of the delayed charging module, and the counting reset module is used for generating a pulse signal according to the charging current and then calculating the number of pulses corresponding to the pulse signal, when the number of pulses is small, the counting reset module resets at the input end of the delay charging module so as to enter a low-speed pulse mode; and a delay module, wherein the input end of the delay module is connected with the output end of the counting reset module, and the delay module lasts for a preset second delay timeaccording to the low-speed pulse mode so as to output a light load quit signal. The light-load detection circuit has the advantages that the light load quit signal can be detected without adding an external device and an additional chip pin, and the light-load detection circuit is simple and reliable.
Description
technical field [0001] The invention relates to the technical field of circuits, in particular to a light-load detection circuit. Background technique [0002] At present, there are more and more electronic devices on the market that require lithium battery charging compartments for charging. In order to improve the use efficiency of the battery compartment for each charge of electronic equipment, it is very practical and necessary to detect the change of the load current at the output terminal of the boost DC converter and to exit the charging function when the load is light. [0003] In the prior art, a differential operational amplifier is usually used to detect the voltage difference of the sensing resistor to detect the load current, thus requiring an accurate external sensing resistor and a pin, which will increase the complexity and cost of the detection circuit. Therefore, aiming at the above problems, it becomes a difficult problem to be solved urgently by those sk...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): H02J7/00
CPCH02J7/0068H02J7/0029H02J7/0047Y02E60/10
Inventor 邱星福符志岗冯伟平朱晓明朱同祥欧新华袁琼
Owner 上海芯导电子科技股份有限公司