US 12,092,671 B2
Capacitance measurement apparatus
Chen Chen, Beijing (CN)
Assigned to CHIPONE TECHNOLOGY (BEIJING) CO., LTD., Beijing (CN)
Appl. No. 17/794,044
Filed by CHIPONE TECHNOLOGY (BEIJING) CO., LTD., Beijing (CN)
PCT Filed Dec. 17, 2020, PCT No. PCT/CN2020/137360
§ 371(c)(1), (2) Date Jul. 20, 2022,
PCT Pub. No. WO2021/179730, PCT Pub. Date Sep. 16, 2021.
Claims priority of application No. 202010167216.2 (CN), filed on Mar. 11, 2020.
Prior Publication US 2023/0065600 A1, Mar. 2, 2023
Int. Cl. G01D 5/24 (2006.01); G01R 27/26 (2006.01)
CPC G01R 27/2605 (2013.01) [G01D 5/24 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A capacitance detection apparatus, comprising:
a channel capacitor, configured to generate different capacitance values according to a sensing signal;
a detection circuit, connected to the channel capacitor, and configured to access a pulse signal, and detect a capacitance value of the channel capacitor; and
an adjustment circuit, connected between the channel capacitor and the detection circuit, and configured to cancel out a basic capacitance value of the channel capacitor, and generate a varying capacitance value of the channel capacitor,
wherein the detection circuit is further configured to convert the varying capacitance value of the channel capacitor into an output signal;
the apparatus further comprising:
a first reset switch, wherein the first reset switch has a first end connected to a forward input end of the detection circuit, and a second end connected to a reverse input end of the detection circuit.