Current detection apparatus and method
A technology of current detection and detection equipment, which is applied in the direction of current measurement only, electronic circuit test, battery overcurrent protection, etc., can solve the problem of power loss of current detection resistors, etc., and achieve low power consumption and highly accurate current detection Effect
Active Publication Date: 2021-06-08
NUVOLTA TECH (HEFEI) CO LTD
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Problems solved by technology
However, as the current flowing through the power switch of the transmitter becomes higher and higher, the power loss in the current sense resistor becomes a significant problem, which poses a challenge to the designer of the wireless power transfer system
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[0024] The making and use of the presently preferred embodiments are discussed in detail below. It should be appreciated, however, that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention.
[0025] The present invention will be described in conjunction with preferred embodiments in a specific context (ie, a current detection device of a wireless power transmission system). However, the present invention is also applicable to various systems that require accurate current sensing (such as overcurrent protection, LED control, base station power control, motor drive control, etc.). Hereinafter, various embodiments will be explained in detail with reference to the accompanying drawings.
[0026] figure 1 A block diagram of a current sensing device accordin...
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The present invention relates to the technical field of current detection, and discloses a current detection device and method, comprising: a positive current detection device having two input terminals respectively connected to a drain and a source of a power switch, and the positive current detection device includes a first Amplifier, first detection switch and second detection switch; a negative current detection device having two input terminals respectively connected to the drain and source of the power switch, the negative current detection device comprising the second amplifier, the third detection switch and the second Four detection switches; and a current detection processing device respectively connected to the positive current detection device and the negative current detection device. Through the above-described embodiments, the present invention can achieve highly accurate current detection and low power consumption.
Description
technical field [0001] The present invention relates to current sensing devices and, in particular embodiments, to current sensing devices and methods for wireless power transfer systems. Background technique [0002] As the technology develops further, wireless power transfer emerges as an efficient and convenient mechanism for powering or charging battery-based mobile devices such as mobile phones, tablet PCs, digital cameras, MP3 players, and the like. A wireless power transfer system usually includes a primary-side transmitter and a secondary-side receiver. The primary side transmitter is magnetically coupled to the secondary side receiver by magnetic coupling. The magnetic coupling may be achieved by a loosely coupled transformer having a primary coil formed in the primary transmitter and a secondary coil formed in the secondary receiver. [0003] A primary side transmitter may include a power conversion unit such as a primary side of a power converter. A power conve...
Claims
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IPC IPC(8): G01R19/00
CPCG01R19/00G01R19/0092G01R19/32H02J50/10H02J50/60H02J7/00304G01R31/302
Inventor 刘思超黄金彪袁冬冬
Owner NUVOLTA TECH (HEFEI) CO LTD