Title:
CURRENT DETECTION CIRCUIT AND CURRENT DETECTION METHOD
Document Type and Number:
WIPO Patent Application WO/2019/076092
Kind Code:
A1
Abstract:
Provided are a current detection circuit and a current detection method. The current detection circuit (100) comprises: an input signal end (IIN), an output signal end (IOUT), an input circuit (11) and a differential current detection amplifier (12), wherein the input circuit (11) comprises two sampling resistors (Rp and Rs), the two sampling resistors (Rp and Rs) are formed by several unit metal resistors of the same type and the same size, and the several unit metal resistors achieve different resistance values through series connection and parallel connection and according to a set current attenuation multiple; the two sampling resistors respectively are a first sampling resistor (Rp) with a relatively low resistance value and a second sampling resistor (Rs) with a relatively high resistance value; the two sampling resistors (Rp and Rs) are respectively connected to two input ends of the differential current detection amplifier (12); the input signal end (IIN) receives a detected current signal and makes same fall on the first sampling resistor (Rp), so as to generate a first current signal reflecting an actual current; and the differential current detection amplifier (12) enables the voltages on the two sampling resistors (Rp and Rs) to be equal so as to generate an attenuated current signal according to the current attenuation multiple.
Inventors:
TANG SHENGBIN (CN)
ZHOU ACHENG (CN)
ZHOU ACHENG (CN)
Application Number:
PCT/CN2018/094970
Publication Date:
April 25, 2019
Filing Date:
July 09, 2018
Export Citation:
Assignee:
MORNSUN GUANGZHOU SCI & TECH (CN)
SHENZHEN NANYUN MICROELECTRONICS CO LTD (CN)
SHENZHEN NANYUN MICROELECTRONICS CO LTD (CN)
International Classes:
G01R19/00
Foreign References:
| CN107765067A | 2018-03-06 | |||
| CN207424076U | 2018-05-29 | |||
| CN107942120A | 2018-04-20 | |||
| CN102331810A | 2012-01-25 | |||
| CN102331517A | 2012-01-25 | |||
| CN103886360A | 2014-06-25 | |||
| CN101840241A | 2010-09-22 |
Attorney, Agent or Firm:
GUANGZHOU ZHIYOU PATENT & TRADEMARK AGENCY CO., LTD. (CN)
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