US 5,343,746 AGranted

Humidity sensing apparatus

AssigneeSamsung Electronics Co., Ltd.

InventorJin K. Choi

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Abstract

A humidity sensing apparatus is operated by an AC power supply. The humidity sensing apparatus comprises a humidity sensing section including a humidity sensor and a divider resistor connected in parallel to the humidity sensor; a humidity sensor operating section for supplying the humidity sensor with an AC voltage within predetermined voltage levels; and, a humidity signal converting section including diodes, condensers and resistors. The humidity signal converting section converts the AC humidity signal output from the humidity sensing section into a corresponding DC humidity signal by selecting the time constants of the pair of condenser-resistor circuits and then supplies the peripheral digital circuits with the converted signals.

Claims5

Dependent claims

A humidity sensing apparatus, comprising:

means for supplying a predetermined AC voltage, said means including a first AC output terminal and a second AC output terminal;
a humidity sensor connected between a first humidity sensor terminal and a second humidity sensor terminal, said first humidity sensor terminal being connected to said first AC output terminal;
a first diode, a cathode of said first diode being connected to said second humidity sensor terminal;
a first charging/discharging means connected between an anode of said first diode and said second AC output terminal;
a second diode, an anode of said second diode being connected to said second humidity sensor terminal;
a second charging/discharging means connected between a cathode of said second diode and said second AC output terminal;
and
means connected to said cathode of said second diode for calculating a humidity level based on a current signal passing through said second diode.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/020,714Filed 22 Feb 1993
Priority: KR 92-248520 Feb 1992
Granted: 6 Sep 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G01N 27/122
Of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid , for detecting components in…:…
G01N 27/121
Of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid , for detecting components in…:…
G01N
Investigating or analysing materials by determining their chemical or physical properties

Family

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