US 12,249,985 B2
Voltage comparator circuit for use with an energy harvester
Feng Lu, Hong Kong (HK); and Jing Jung Tang, Hong Kong (HK)
Filed by Logistics and Supply Chain MultiTech R&D Centre Limited, Hong Kong (HK)
Filed on Mar. 16, 2023, as Appl. No. 18/184,941.
Prior Publication US 2024/0313778 A1, Sep. 19, 2024
Int. Cl. H03K 19/0185 (2006.01); H03K 3/356 (2006.01); H03K 17/10 (2006.01)
CPC H03K 19/018521 (2013.01) [H03K 3/356104 (2013.01); H03K 17/102 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A voltage comparator circuit for a power source having an energy harvester and an energy storage, comprising:
a first voltage input node and a second voltage input node arranged to respectively receive a first voltage level, VDD1, of a first output of the energy harvester and a voltage level, VDD2, of a second output of the energy storage;
an output node, Y, arranged to switch in response to a comparison of VDD1 and VDD2; and
a plurality of semiconductor junction devices arranged to provide a floating local ground, VSS_LOCAL, arranged to vary in response to a change of the VDD1 and/or VDD2, wherein VSS_LOCAL has a voltage level higher than an absolute ground, GND, connected to the voltage comparator circuit;
wherein the floating local ground, VSS_LOCAL, is arranged to prevent a breakdown of circuit components due to a voltage difference connected at terminals of each of the circuit component exceeding a breakdown voltage, Vmax, of the respective circuit component.