CONSTANT CURRENT DRIVING CIRCUIT AND CORRESPONDING PHOTOELECTRIC SMOKE ALARM CIRCUIT

Title:

CONSTANT CURRENT DRIVING CIRCUIT AND CORRESPONDING PHOTOELECTRIC SMOKE ALARM CIRCUIT

Document Type and Number:

WIPO Patent Application WO/2020/048544

Kind Code:

A1

Abstract:

A constant current driving circuit and a corresponding photoelectric smoke alarm circuit, wherein the constant current driving circuit comprises a reference voltage source module (1), a linear voltage regulator module (3), a level conversion module (2), a current mirror module (4) and a first NMOS transistor, wherein the linear voltage regulator module (3) may control the turning on and turning off thereof according to actual requirements, thus electrical energy loss may effectively be reduced for some periodically used devices. A constant current driving circuit that employs the foregoing structure and a corresponding photoelectric smoke alarm circuit may provide a constant current source, thus causing auxiliary output performance to remain stable within a full temperature range such that a certain timing requirement is met; no standby power is consumed when inoperative, thus performance is stable, power consumption is low, and the range of application is wide.

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Inventors:

ZHOU YUJIE (CN)
ZNEG JIEQIONG (CN)
ZHANG TIANSHUN (CN)
DING ZENGWEI (CN)

Application Number:

PCT/CN2019/104885

Publication Date:

March 12, 2020

Filing Date:

September 09, 2019

Export Citation:

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Assignee:

WUXI CHINA RESOURCES SEMICO CO (CN)

International Classes:

G05F3/26

Domestic Patent References:

WO2004063827A1	2004-07-29
WO2004042782A2	2004-05-21

Foreign References:

CN109062317A	2018-12-21
CN204883456U	2015-12-16
CN203773395U	2014-08-13
CN106502301A	2017-03-15
CN108122363A	2018-06-05
CN201811041244A	2018-09-07

Other References: