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    • 3. 发明授权
    • Voltage regulated pressure transducer apparatus
    • 电压调节压力传感器装置
    • US6009757A
    • 2000-01-04
    • US79625
    • 1998-05-15
    • Norman E. LeComteDale R. SoggeNeal PughEdward F. Racca
    • Norman E. LeComteDale R. SoggeNeal PughEdward F. Racca
    • G01L9/00G01L9/12
    • G01L9/0075G01L9/12
    • A capacitive transducer (10) has a housing (12) which receives a variable capacitor (14) in a fluid pressure receiving chamber (12e). A support (20) is received on an annular shoulder (12j) formed in the sidewall (12h) of the housing. The support has inner and outer concentric ring shaped lands (20k, 20l) with the inner ring shaped land engaging the variable capacitor (14) inboard of the outer peripheral edge of the capacitor. A shelf (20d) is formed on the sidewall of the support which receives a first relatively rigid substrate (26a) of a circuit board which has a second relatively rigid substrate (26b) bent through a connecting flexible strip so that the second substrate overlies the first substrate within a circuit receiving chamber (20c). A ratiometric signal conditioning circuit portion 28a and voltage regulating circuit portion 28b are mounted on the circuit board. The voltage regulating circuit is used to convert the transducer into a variable supply/fixed output device and includes a precision voltage regulator (U2) having an input capability of a portion of the range of the variable supply voltage, an NPN transistor (Q1) to provide a variable resistance in the primary current path, a zener diode D3, a current regulating diode (D2) to bias the transistor and the zener diode, a blocking diode (D1) and associated capacitors (C13, C14, C15).
    • 电容式换能器(10)具有容纳流体压力接收室(12e)中的可变电容器(14)的壳体(12)。 支撑件(20)被容纳在形成在壳体的侧壁(12h)中的环形肩部(12j)上。 支撑件具有内外环形环形区域(20k,20l),其内环形区域与电容器外周边缘内侧的可变电容器(14)接合。 架子(20d)形成在支撑件的侧壁上,其接收电路板的第一相对刚性的基板(26a),该基板具有弯曲穿过连接柔性带的第二相对刚性的基板(26b),使得第二基板 电路接收室(20c)内的第一衬底。 比例信号调理电路部分28a和电压调节电路部分28b安装在电路板上。 电压调节电路用于将换能器转换成可变供电/固定输出装置,并且包括具有可变电源电压范围的一部分的输入能力的精密电压调节器(U2),NPN晶体管(Q1)至 在初级电流路径中提供可变电阻,齐纳二极管D3,用于偏置晶体管和齐纳二极管的电流调节二极管(D2),阻塞二极管(D1)和相关联的电容器(C13,C14,C15)。