公开(公告)号：US11410845B2

公开(公告)日：2022-08-09

申请号：US16881712

申请日：2020-05-22

Applicant: HONEYWELL INTERNATIONAL INC.

Inventor： Chuang Huang ,  Tengfei Zhang ,  Bing Chen ,  Feng Liang

IPC: H01J61/56 ,  G01N33/00 ,  H02M7/44 ,  H02M3/00

Abstract: Methods, apparatuses, and systems for providing an alternating current (AC) voltage supply for a photoionization detector lamp from a direct current (DC) voltage source are provided. An example apparatus may include a DC voltage to DC voltage (DC/DC) converter circuitry, and a feedback circuitry that is electronically coupled to the DC/DC converter circuitry and converts a reference AC voltage to a feedback DC voltage for the DC/DC converter circuitry. In some examples, the feedback circuitry may be electronically coupled to a DC voltage to AC voltage (DC/AC) converting circuitry to obtain the reference AC voltage.

公开(公告)号：US11782036B2

公开(公告)日：2023-10-10

申请号：US16916287

申请日：2020-06-30

Applicant: HONEYWELL INTERNATIONAL INC.

Inventor： Chuang Huang ,  Tengfei Zhang ,  Bing Chen ,  Feng Liang

IPC: G01N33/00 ,  G01N27/66

CPC classification number: G01N33/0026 ,  G01N27/66 ,  G01N33/0029

Abstract: Methods and systems for detecting and limiting the water in a photoionization detector are provided. The method may include powering off a lamp configured to ionize particles of air. The method may also include monitoring a signal from the photoionization detector. The signal may be monitored based on a current between a signal electrode and a bias electrode. In an instance the signal is above a signal threshold, the method may also include electrolyzing one or more particles of water present in the photoionization detector by closing a leakage switch in order to allow current to flow through the bias electrode and the signal electrode. In an instance the signal is below the signal threshold, the method may include powering on the lamp to begin photoionization detection. Corresponding systems are also provided.