DC voltage threshold detector
US7936085B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 15, 2009 |
| Grant date | May 3, 2011 |
| Priority date | — |
| Expiry date | Nov 25, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/22
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A voltage detection circuit comprises a tap to be connected to a positive line and a return tap to be connected to a return line on a power supply. The potential difference between the positive line and the return line is the input line voltage. A scaling resistor network scales down the input line voltage to be indicative of a voltage on the input line. The scaled voltage is connected to an input for a comparator. A reference voltage is supplied to the comparator. The reference voltage supplied to the comparator is indicative of a threshold voltage at which an output of the circuit changes states. An output of the comparator communicates a signal to an optical isolation device when the input line voltage is below the threshold voltage to turn the optical isolation device on and send a signal to an output of the optical isolation device. The optical isolation device is not turned on if the input line voltage exceeds the threshold voltage. A DC power bus incorporating the voltage detection circuit, along with an aircraft electrical system incorporating the DC power bus are also disclosed and claimed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.