Title:
CURRENT SAMPLING CIRCUIT AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/216975
Kind Code:
A1
Abstract:
A current sampling circuit and an electronic device. The circuit comprises: a resistance adjustable module (1) comprising a power transistor Q1 and a power transistor group, the power transistor Q1 having a drain connected to a current input end, and a source connected to a current output end by means of the power transistor group; a current sampling module (2) connected to the power transistor group and used for acquiring a current signal of the power transistor group; and a signal adjustment module (3) separately connected to the current sampling module (2), a reference voltage end Vref, the power transistor Q1 and the power transistor group. The resistance value R of the equivalent resistor of the power transistor group is increased when the current value I of flowing current is small, so that the requirement for the input offset voltage of a sampling operational amplifier is reduced, R is decreased when I is large, but the product of I*R is still maintained in a large range, and is insensitive to the input offset voltage of the sampling operational amplifier, a common sampling operational amplifier can satisfy a general requirement, and an accurate sampling function on changing current is achieved.
Inventors:
YANG YONGHAO (CN)
CHEN XIN (CN)
CHEN XIN (CN)
Application Number:
PCT/CN2023/092188
Publication Date:
November 16, 2023
Filing Date:
May 05, 2023
Export Citation:
Assignee:
SHENZHEN INJOINIC TECH CO LTD (CN)
International Classes:
G01R19/00; G01R1/30; H03F1/30
Foreign References:
| CN114594303A | 2022-06-07 | |||
| CN113466538A | 2021-10-01 | |||
| CN112187267A | 2021-01-05 | |||
| CN112710886A | 2021-04-27 | |||
| CN111900974A | 2020-11-06 | |||
| CN101924547A | 2010-12-22 | |||
| JP2011205180A | 2011-10-13 |
Attorney, Agent or Firm:
SCIHEAD IP LAW FIRM (CN)
Download PDF:
Previous Patent: POSITIONING METHOD AND POSITIONING APPARATUS
Next Patent: DISPLAY METHOD AND APPARATUS, ELECTRONIC DEVICE, AND STORAGE MEDIUM
Next Patent: DISPLAY METHOD AND APPARATUS, ELECTRONIC DEVICE, AND STORAGE MEDIUM