Heated type sensor with auxiliary heater in bridge circuit for maintaining constant sensor temperature
First Claim
1. A heating type sensor in which a main heater and an auxiliary heater are arranged adjacent to a sensing portion to heat said sensing portion to a predetermined temperature, in which said auxiliary heater comprises one side of a bridge circuit;
- said bridge circuit is parallel to said main heater, a pyro control circuit feeding the power to said bridge circuit and said main heater based on the output of said bridge.
1 Assignment
0 Petitions
Accused Products
Abstract
A main heater, auxiliary heater and guard heater arranged on an insulator substrate to absorb leakage current, thereby maintaining precise sensing temperature. The main heater is parallel with a bridge circuit containing the auxiliary heater, and the main and auxiliary heater s are typically adjacently arranged with a guard heater there between, electrically interconnected to maintain target temperature of the main heater, regardless of leakage current typically resultant from insulation substrate deterioration.
19 Citations
9 Claims
-
1. A heating type sensor in which a main heater and an auxiliary heater are arranged adjacent to a sensing portion to heat said sensing portion to a predetermined temperature, in which said auxiliary heater comprises one side of a bridge circuit;
- said bridge circuit is parallel to said main heater, a pyro control circuit feeding the power to said bridge circuit and said main heater based on the output of said bridge.
- View Dependent Claims (2, 3)
- 4. A heating type sensor in which a main heater and an auxiliary heater are arranged adjacent to a sensing portion to heat said sensing portion to a predetermined temperature in which a guard heater is arranged between said main and auxiliary heaters adjacent to said auxiliary heater.
Specification