CN203414136U - Liquid-level sensor circuit - Google Patents

Liquid-level sensor circuit Download PDF

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Publication number
CN203414136U
CN203414136U CN 201320538480 CN201320538480U CN203414136U CN 203414136 U CN203414136 U CN 203414136U CN 201320538480 CN201320538480 CN 201320538480 CN 201320538480 U CN201320538480 U CN 201320538480U CN 203414136 U CN203414136 U CN 203414136U
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electrode
connected
oscillation
level sensor
microcontroller
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CN 201320538480
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Chinese (zh)
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杨腊平
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温州市国大电器有限公司
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Abstract

The utility model relates to a sensor circuit, in particular to a liquid-level sensor circuit. The liquid-level sensor circuit comprises a pair of metal electrodes, a power supply circuit, a vibration generation and detection unit adopting a single chip microprocessor as a core, and an alarm signal amplification unit. Through the vibration generation and detection unit adopting the single chip microprocessor as the core and by utilizing the remarkable variation of electric capacitance under two statuses that medium is charged between the two electrodes and the medium is not charged between the two electrodes, whether the liquid-level sensor is contacted with a liquid surface is judged by detecting the amplitude of the vibration voltage on the electrodes, so that the purpose of detecting the liquid level can be realized. Meanwhile, the vibration generation and detection unit of the liquid-level sensor circuit adopts the universal single chip microprocessor as the core, so that the price is low, and the procurement is convenient, and the popularization is easy.

Description

一种液位传感器电路 One kind of liquid level sensor circuit

技术领域 FIELD

[0001] 本实用新型涉及一种传感器电路,具体是一种液位传感器电路。 [0001] The present invention relates to a sensor circuit, particularly a level sensor circuit.

背景技术 Background technique

[0002] 在现有的生产和生活中广泛地用到水位的控制,如供水塔、太阳能热水器、蒸汽发生器及汽车水箱等都需要用到液位传感器对设备中的水位进行监测,液位传感器的可靠性对设备的正常运行及维护至关重要。 [0002] widely used to control the water level in the existing production and life, such as water tower, solar water heaters, steam generators, and so need to use the car tank water liquid level sensor device for monitoring the liquid level reliability of the sensor is essential for the normal operation and maintenance of equipment. 目前的液位传感器有机械式和电子式,机械式通常包括浮球和干簧管,浮球上设有磁性体,通过干簧管对磁性体位置的感应来监测液位,成本低廉,但是精度不高,并且浮球容易被异物卡住或黏住,干簧管的触点容易结碳,导致不能正常工作。 The current level sensor mechanical and electronic, mechanical type generally comprise a float and reed switch, a magnetic float body, to monitor the level of the position sensing by the magnetic reed switch, low cost, but accuracy is not high, and float easily jammed or foreign matter sticks, reed contacts easy carbon deposition, leading to not work properly. 电子式通常设有专用电路,目前基本为进口产品,精度较高,但是线路复杂,元件不易采购,价格较高,难以全面推广。 Electronic usually has a dedicated circuit, the current basic imported products, high precision, but the line complex and difficult component sourcing, higher prices, it is difficult to comprehensively promote.

发明内容 SUMMARY

[0003] 本实用新型的目的在于为了克服现有技术的缺陷而提供一种精度较高,但是价格合理的液位传感器电路。 [0003] The present invention aims to overcome the drawbacks of the prior art and to provide a high precision, but the price is reasonable level sensor circuit.

[0004] 为了实现上述目的,本实用新型公开了一种液位传感器电路,其特征在于:包括一对金属电极、电源电路、单片机为核心构成的振荡发生及检测单元和报警信号放大单元,所述振荡发生及检测单元的振荡输出端与所述一对金属电极中的第一电极连接,所述第一电极经过一旁路电容和整流电路后与所述振荡发生及检测单元的振荡检测输入端连接,所述报警信号放大单元的输入端与所述振荡发生及检测单元的报警控制端连接,所述一对金属电极中的第二电极经过一隔离电容与电源地连接,所述第一电极与第二电极相互隔离设置,在所述第一电极与第二电极之间充满被测介质时,所述第一电极与第二电极之间形成的电容和隔离电容的总等效电容量与所述旁路电容相比较至少大一个数量级;所述电源电路为振荡发生及检测单元提供工作电源。 [0004] To achieve the above object, the present invention discloses a liquid level sensor circuit, characterized by: an oscillation comprises a pair of metal electrodes, the power supply circuit, the microcontroller core configuration and generating an alarm signal detection means and amplifying means, the oscillation detection input terminal of said detecting means, and oscillates the oscillation output terminal and the first electrode connected to the metal electrode of the pair of the first electrode after a bypass capacitor and a rectifying circuit and the detecting unit oscillates and connection, the alarm signal input terminal of the amplifying unit of the oscillation detection means and the occurrence of the alarm control terminal connected to the second electrode of the pair of metal electrodes via a blocking capacitor connected to the power source, the first electrode when the second electrode isolated from each other with a measured medium filled between the first and second electrodes, the total equivalent capacitance is formed between the first electrode and the second electrode and the capacitor capacitance and isolation comparing said bypass capacitor is at least one order of magnitude; the power supply circuit supplies power to the detection unit and oscillates.

[0005] 本液位传感器电路通过设置以单片机为核心构成的振荡发生及检测单元,并且利用两个电极间是否充有介质两种状态下电容量的显著变化,通过对电极上的振荡电压幅度的检测判断液位传感器是否已经接触到液面,达到液位检测的目的。 [0005] The present circuit by a level sensor arranged to oscillate and the microcontroller core configuration detecting unit, and if the use of a significant change in charge capacity of the two states of the medium between the two electrodes, by the oscillation of the voltage amplitude on the electrode determining whether the detected level sensor has contacted liquid surface level detection purposes. 同时由于本液位传感器电路的振荡发生及检测单元以通用的单片机为核心构成,价格低,采购方便,易于推广。 The same time as the oscillation circuit of the present level sensor and the detection unit generating a common microcontroller core configuration, low cost, easy to purchase, easy to spread.

[0006] 下面结合附图及具体实施例对本实用新型作进一步说明。 [0006] The following further explanation of the invention and for specific embodiments in conjunction with the accompanying drawings.

附图说明 BRIEF DESCRIPTION

[0007] 附图1为本实用新型具体实施例电路原理框图; [0007] Figure 1 a schematic block diagram of the circuit of the present embodiment DETAILED new utility;

[0008] 附图2为本实用新型具体实施例电路原理图。 [0008] Figure 2 of the circuit schematic diagram of specific embodiment of the present invention.

具体实施方式 detailed description

[0009] 如图1所示,液位传感器电路包括一对金属电极、电源电路、单片机为核心构成的振荡发生及检测单元和报警信号放大单元。 [0009] As shown, the liquid level sensor circuit comprises a pair of metal electrodes, the power supply circuit, the microcontroller core composed of an oscillation detection means and generating a signal amplification means and alarm. 所述振荡发生及检测单元的振荡输出端与所述一对金属电极中的第一电极A连接,所述第一电极A经过一旁路电容和整流电路后与所述振荡发生及检测单元的振荡检测输入端连接,所述报警信号放大单元的输入端与所述振荡发生及检测单元的报警控制端连接,所述一对金属电极中的第二电极B经过一隔离电容与电源地连接,所述第一电极A与第二电极B相互隔离设置,在所述第一电极与第二电极之间充满被测介质时,所述第一电极A与第二电极B之间形成的电容和隔离电容的总等效电容量与所述旁路电容相比较至少大一个数量级,通常以10-50倍为宜;所述电源电路为振荡发生及检测单元提供工作电源。 Oscillation detection means and the occurrence of the oscillation output of the oscillation A first electrode of the pair of metal electrodes connected to a first electrode A after a bypass capacitor and a rectifier circuit with the oscillation and the detection unit detecting an input terminal connected to an input terminal of said amplifying unit, the alarm signal and the occurrence of oscillations of the detector alarm control unit is connected, the pair of second electrode B of the metal electrodes through a blocking capacitor connected to the power supply, the when said first capacitor electrode and the separator a and B are isolated from the second electrode is provided, the measured medium filled between the first electrode and the second electrode is formed between the a electrode and the second electrode B of the first the total equivalent capacitance of the bypass capacitor capacitance as compared with the at least one order of magnitude, and is preferably 10-50 times; the power supply circuit supplies power to the detection unit and oscillates. 本具体实施例中,如图2所示,电源电路选用三端稳压器Ul和滤波电容Cl和C2构成,当然也可以用分立元件组成;所述振荡发生及检测单元以单片机U2为核心构成,本具体实施例中选用PIC12F675 (也可以选用其他同类产品),单片机PIC12F675的第一输出端(引脚3)与第一电极A连接,所述报警信号放大单元由放大三极管Ql构成,单片机PIC12F675的第二输出端(引脚7)经过限流电阻与放大三极管Ql基极连接;所述整流电路包括整流二极管D2和由电阻R4和电容C5组成的RC并联滤波支路,所述RC并联滤波支路连接在单片机PIC12F675的第一输入端(引脚5)与电源地之间,所述旁路电容C3 —端与第一电极连接A,另一端与整流二极管D2正极连接,所述整流二极管D2负极与单片机PIC12F675的第一输入端(引脚5)连接。 In the present embodiment, as illustrated, the power supply circuit used three-terminal regulator Ul and filter capacitors Cl and C2 form 2 may of course be implemented with discrete elements; and said detection means to oscillate the microcontroller U2 are configured core , PIC12F675 embodiment chosen (also can use other similar products), a first output terminal PIC12F675 microcontroller (pin 3) connected to the first electrode a of the present particular embodiment, the alarm signal amplifying means is constituted by the transistor Ql, amplification, microcontroller PIC12F675 a second output terminal (pin 7) through the limiting resistor and a base connected amplifier transistor Ql; said rectifier circuit including a rectifying diode D2 and a RC filter branch parallel resistor R4 and capacitor C5 form of a parallel RC filter PIC12F675 microcontroller branch is connected between a first input terminal (pin 5) with power, said bypass capacitor C3 - terminal connected to the first electrode a, and the other end connected to the positive rectifier diode D2, the diode rectifier D2 and the negative input of a first PIC12F675 microcontroller (pin 5).

[0010] 本液位传感器电路的工作原理如下:所述振荡发生及检测单元在有工作电源的情况下通过内部程序设定从第一输出端(引脚3)输出振荡电压信号至第一电极A,如果此时液位传感器电路的第一电极A与第二电极B未与被检液态介质接触,则第一电极A与第二电极B之间形成的电容量很小,大部分振荡电压信号经过旁路电容和整流电路后输至所述振荡发生及检测单元的振荡检测输入端(引脚5),振荡发生及检测单元检测到较大振荡电压信号;当液位传感器电路的第一电极A与第二电极B与被检液态介质接触,则第一电极A与第二电极B之间形成的电容量增大,较所述旁路电容至少大一个数量级,此时,大部分振荡电压信号经过第一电极A与第二电极B之间形成的电容及电容C4到电源地了,只有很小一部分经过旁路电容和整流电路后输至所述振荡发生及检测单元的振荡 [0010] The present liquid level sensor circuit works as follows: the detecting means and the occurrence of oscillation in the case of working power setting (pin 3) from a first output terminal outputting an oscillating voltage signal to the first electrode through internal procedures a, At this time, if the first electrode a liquid level sensor circuit B second electrode is not in contact with the inspected liquid medium, the capacitance formed between the first electrode and the second electrode B of a is small, most of the oscillating voltage oscillation detection input terminal (pin 5) and signal through the bypass capacitor to the output of the rectifier circuit and the detection means to oscillate, and the oscillation detecting unit detects the occurrence of a large oscillating voltage signal; when the first liquid level sensor circuit a B electrode and the second electrode in contact with the inspected liquid medium, is formed between the first electrode and the second electrode B a capacitance is increased, compared with the bypass capacitor is at least one order of magnitude, at this time, most of the oscillation capacitor C4 and the capacitor voltage signal a passes between the first electrode and the second electrode power supply B is formed to the ground, only a small portion of the bypass capacitor after the input rectification circuit and to oscillate the oscillation detection means and 测输入端(引脚5),振荡发生及检测单元只能检测到很小的振荡电压信号,振荡发生及检测单元根据检测到的振荡电压信号的大小即可判断液面是否接触到液位检测探头。 Sense input (pin 5), and the oscillation detecting unit detects only occurs to a small oscillating voltage signal, and detecting means oscillates according to the size of the detected oscillation signal to a voltage level determines the liquid level detector is in contact probe.

Claims (2)

  1. 1.一种液位传感器电路,其特征在于:包括一对金属电极、电源电路、单片机为核心构成的振荡发生及检测单元和报警信号放大单元,所述振荡发生及检测单元的振荡输出端与所述一对金属电极中的第一电极连接,所述第一电极经过一旁路电容和整流电路后与所述振荡发生及检测单元的振荡检测输入端连接,所述报警信号放大单元的输入端与所述振荡发生及检测单元的报警控制端连接,所述一对金属电极中的第二电极经过一隔离电容与电源地连接,所述第一电极与第二电极相互隔离设置,在所述第一电极与第二电极之间充满被测介质时,所述第一电极与第二电极之间形成的电容和隔离电容的总等效电容量与所述旁路电容相比较至少大一个数量级;所述电源电路为振荡发生及检测单元提供工作电源。 A liquid level sensor circuit, characterized by: an oscillation comprises a pair of metal electrodes, the power supply circuit, the microcontroller core configuration and generating an alarm signal detection means and amplifying means, the oscillation output of the oscillation detection means and the occurrence and a first electrode connected to the metal electrodes of the pair, the first electrode after a bypass capacitor and a rectifier circuit and an oscillation occurrence detection unit detecting an input terminal connected to said oscillation, said alarm signal at the input of the amplifying means the occurrence of oscillation of the detector and alarm control unit is connected to the second electrode of the pair of metal electrodes via a blocking capacitor connected to the power supply, the first and second electrodes disposed isolated from each other, the when filled with the measured medium between the first electrode and the second electrode is formed between the first electrode and the second electrode and the capacitance of the isolation capacitor total equivalent capacitance of the bypass capacitor and comparing the at least one order of magnitude ; the power supply circuit supplies power to the detection unit and oscillates.
  2. 2.根据权利要求1所述的液位传感器电路,其特征在于:所述振荡发生及检测单元以单片机PIC12F675为核心构成,单片机PIC12F675的第一输出端与第一电极连接,所述报警信号放大单元由放大三极管构成,单片机PIC12F675的第二输出端经过限流电阻与放大三极管基极连接;所述整流电路包括整流二极管和RC并联滤波支路,所述RC并联滤波支路连接在单片机PIC12F675的第一输入端与电源地之间,所述旁路电容一端与第一电极连接,另一端与整流二极管正极连接,所述整流二极管负极与单片机PIC12F675的第一输入端连接。 The liquid level sensor circuit according to claim 1, wherein: said detecting unit oscillates and constitute the core of a microcontroller PIC12F675, PIC12F675 microcontroller a first output terminal connected to the first electrode, the alarm signal amplification means constituted by the amplification transistor, the second output of the microcontroller PIC12F675 through limiting resistor connected to the amplifying transistor base; said rectifier circuit includes a rectifier diode and a parallel RC filter branch, said RC filter branch parallel connection of microcontroller PIC12F675 between the first input terminal of the power supply, the bypass capacitor connected to one end of the first electrode, and the other end connected to the cathode of the rectifier diode, a first input terminal of the rectifier and the cathode of the diode is connected to the microcontroller PIC12F675.
CN 201320538480 2013-08-30 2013-08-30 Liquid-level sensor circuit CN203414136U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104482097A (en) * 2014-12-23 2015-04-01 常熟赛驰机械有限公司 Damper
CN104697605A (en) * 2015-03-19 2015-06-10 北京中航赛维生物科技有限公司 Intelligent liquid level induction circuit and device
CN104713615A (en) * 2015-03-23 2015-06-17 杭州电子科技大学 Circuit of drainage pipe network liquid level measurement device
CN105259422A (en) * 2015-10-22 2016-01-20 宁波力芯科信息科技有限公司 Capacitance measurement circuit, liquid level detection circuit and method of using same, liquid level height detection circuit, water heater, and smart home device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104482097A (en) * 2014-12-23 2015-04-01 常熟赛驰机械有限公司 Damper
CN104697605A (en) * 2015-03-19 2015-06-10 北京中航赛维生物科技有限公司 Intelligent liquid level induction circuit and device
CN104713615A (en) * 2015-03-23 2015-06-17 杭州电子科技大学 Circuit of drainage pipe network liquid level measurement device
CN104713615B (en) * 2015-03-23 2017-12-26 杭州电子科技大学 Drainage network circuit for a liquid level detecting device
CN105259422A (en) * 2015-10-22 2016-01-20 宁波力芯科信息科技有限公司 Capacitance measurement circuit, liquid level detection circuit and method of using same, liquid level height detection circuit, water heater, and smart home device
CN105259422B (en) * 2015-10-22 2018-03-30 宁波力芯科信息科技有限公司 Capacitance measuring circuit, the liquid level detection circuit and method of use, the liquid level detection circuit, food, smart home devices

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