US 11,870,277 B2
Back-data transmission circuit robust to load changes and method thereof
Hyung-Min Lee, Seoul (KR); and Hyun-Su Lee, Seoul (KR)
Assigned to Korea University Research and Business Foundation, Seoul (KR)
Filed by Korea University Research and Business Foundation, Seoul (KR)
Filed on May 26, 2022, as Appl. No. 17/825,586.
Claims priority of application No. 10-2021-0089783 (KR), filed on Jul. 8, 2021.
Prior Publication US 2023/0009325 A1, Jan. 12, 2023
Int. Cl. H02J 50/80 (2016.01); H02J 50/12 (2016.01)
CPC H02J 50/80 (2016.02) [H02J 50/12 (2016.02)] 6 Claims
OG exemplary drawing
 
1. A back-data transmission circuit robust to load changes, comprising:
an input module including an arbitrary sensor and configured to generate an input signal by generating a sensing signal and digitally converting the sensing signal;
a modulator configured to generate a modulation signal by performing a modulation operation when there is a change in the input signal, the modulation operation being performed by setting an open circuit mode and a short circuit mode in a preset order, starting from a point in time when the change in the input signal occurs;
a receiving terminal configured to transmit the modulation signal to a transmitting terminal by inducing the modulation signal; and
a demodulator comprising an envelope detector, a low-pass filter and a differentiator, and configured to generate an output signal by measuring an induction signal induced from the receiving terminal to the transmitting terminal and calculating a slope of a voltage change represented by the induction signal,
wherein the modulator is configured to:
perform the modulation operation in the open circuit mode for a preset first time interval from a time when the change in the input signal occurs, and perform the modulation operation in the short circuit mode for a preset second time interval from a time when the first time interval has elapsed, or
perform the modulation operation in the short circuit mode for the preset first time interval from the time when the chance in the input signal occurs, and perform the modulation operation in the open circuit mode for the preset second time interval from the time when the first time interval has elapsed, and
wherein the first time interval and the second time interval are set based on a magnitude of a load, such that the modulation operation by the modulator causes a voltage at the transmitting terminal to be unaffected by the load changes.