Zero-crossing detection circuit
US12399198B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2024 |
| Grant date | Aug 26, 2025 |
| Priority date | — |
| Expiry date | May 10, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/175
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A zero-crossing detection circuit includes a variable resistor, a first switch, a first capacitor, a first selector, a second selector, a first transistor, and a comparator. Variable resistor is connected to power supply voltage via reference resistor. First switch has first terminal coupled to first terminal of variable resistor. First capacitor has first terminal coupled to second terminal of first switch. First selector makes second terminal of first capacitor receive switching voltage or reference ground voltage according to first control signal. First transistor has first terminal coupled to second terminal of variable resistor. Second terminal of first transistor receives reference ground voltage. Second selector couples control terminal of first transistor to first terminal of first transistor or to first terminal of first capacitor according to first control signal. Comparator compares voltage on second terminal of variable resistor with reference voltage to generate final zero-crossing detection output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.