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Heater drive circuit

A technology for driving circuits and heaters, applied in ohmic resistance heating, instruments, electric heating devices, etc.

Inactive Publication Date: 2006-05-31
MITSUBA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this method is that only a low voltage of 3.3V is supplied to the heating resistor due to the voltage drop of 0.5V caused by the operational amplifier 103 in the voltage control circuit and the 1.2V voltage drop caused by the transistor 104 in the output circuit

Method used

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Embodiment Construction

[0019] Embodiments of the present invention will be described with reference to the drawings.

[0020] The present invention applies for example to figure 1 The heater drive circuit 13 in the urea water detection system configured as shown. A urea water detection system mounted on, for example, a vehicle running by a diesel engine detects the urea concentration of the urea water of the urea SCR catalyst, and provides the detected concentration value to an exhaust gas purification system (not shown).

[0021] [Configuration of Heater Drive Circuit]

[0022] Such as figure 1 As shown, the urea water concentration detection system comprising a heater drive circuit mainly includes: ECU 1; an ignition power supply 2 that works with the ignition switch of the vehicle; and a detection circuit 3, the ignition power supply 2 and the detection circuit 3 are connected to the ECU 1. When an ignition switch (IGN) (not shown) of the system is turned on, an ignition voltage is supplied...

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PUM

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Abstract

There is provided a heater driving circuit for applying a voltage to a heating resistor when a temperature change is detected according to the concentration of a predetermined element contained in a liquid, the heater driving circuit including: a voltage boosting circuit for raising a predetermined to generate a boosted supply voltage; a voltage control circuit that includes an operational amplifier driven by the boosted supply voltage from the boost circuit; and an emitter follower output circuit whose base terminal is connected to the Output voltage with its collector terminal connected to a predetermined reference supply and its emitter terminal connected to a heating resistor.

Description

[0001] This application claims priority based on Japanese Patent Application No. 2004-316095 filed on October 29, 2004, the entire contents of which are incorporated herein by reference. This priority claim was made with the filing of this application. technical field [0002] The present invention relates to a heater driving circuit mounted on a vehicle etc., when determining whether urea water of a urea (urea) SCR (selective catalyst removal method) catalyst for decomposing NOx into water and hydrogen has an appropriate urea concentration , the circuit is driven to detect the thermal resistance of the liquid in the bridge circuit. Background technique [0003] In the related art, for example, known is a urea concentration sensor used in an exhaust gas purification system of a diesel engine, which amplifies a weak signal of 0.1 mV or less and performs A / D conversion on the generated signal using a microcomputer to detect concentration of urea water. The technology used in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B1/00G01N27/02H05B3/00
CPCG01N33/0016
Inventor 伊藤雄榎本惠一
Owner MITSUBA CORP