CN201113963Y - High temperature inductor type approach switch - Google Patents
High temperature inductor type approach switch Download PDFInfo
- Publication number
- CN201113963Y CN201113963Y CNU200720040441XU CN200720040441U CN201113963Y CN 201113963 Y CN201113963 Y CN 201113963Y CN U200720040441X U CNU200720040441X U CN U200720040441XU CN 200720040441 U CN200720040441 U CN 200720040441U CN 201113963 Y CN201113963 Y CN 201113963Y
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Abstract
The utility model provides a high-temperature inductance approach switch, comprising a high-frequency oscillation circuit, a shaping detection circuit, a signal processing circuit and a switching value output circuit, wherein, the high-frequency oscillation circuit is an LC oscillation circuit; the signal processing circuit is a circuit using a U2136 series chip as a core; the inside of the chip is provided with the shaping detection circuit which performs a corresponding compensation to a drift of a capacitor value caused by an increased temperature; an output end of the LC oscillation circuit is connected with an 8 pin of chip which a received DC signal is sent in; and a 5 pin of the chip is connected with a control end of the switching value output circuit. Compared with the prior art, the high-temperature inductance approach switch has the advantage that the range of temperature capable of accurately working can be wider.
Description
Technical field
The utility model relates to a kind of inductance approach switch, particularly a kind of high temperature modification inductance approach switch.
Background technology
Electronic sensor is a requisite staple product in the industrial control field, and its application continues to increase with normal speed.In the industrial machine manufacture process that needs to count, monitor, locate or measure, proximity transducer, photoelectric sensor and ultrasonic sensor are common elements.But the most ripe product is inductance type proximity transducer and capacitive proximity sensor, and it is with the most use in machine-building.As a kind of application of inductance type proximity transducer, inductance approach switch can contactlessly detect all metals, and inductance approach switch shell employing screw-type, and joint adopts the standard connector, is convenient to install.Its principle is, a LC oscillation circuit produces a high-frequency alternating magnetic field, and this alternating field is that the sensitive surface from transducer radiates.A kind of have electricity and lead the object of ability and enter this, like this according to induction law, interior of articles produces into eddy current, this eddy current reacts on the LC oscillation circuit, the energy of oscillation-damped circuit, therefore amplitude reduces, and the parameter of internal circuit changes, identify thus and have or not metal object approaching, and then the on-off of control switch.When causing the letter switching value to change when the conducting material proximity transducer, the distance of itself and sensitive surface is called distance of reaction.This type of has fricton-tight contact near nearly transducer, is not subjected to the influence of nonmetal factors such as dust during work, and low-power consumption, the long-life, can use under various mal-conditions.But inductance approach switch can only be used for general industrial temperature-25 ℃-80 ℃, and the amplitude of LC vibration produces and can change when surpassing temperature range, and distance of reaction can correspondingly reduce.
Summary of the invention
In order to solve the problem that the inductance approach switch serviceability temperature is limited in scope in the prior art, the utility model proposes a kind of high temperature modification inductance approach switch, concrete technical scheme is:
A kind of high temperature modification inductance approach switch, its electric part comprise high-frequency oscillating circuits, shaping detecting circuit, signal processing circuit, switching value output circuit.Described high-frequency oscillating circuits is the LC oscillating circuit, and signal processing circuit is to be the circuit of core with the U2136 family chip.The inside of this chip is provided with temperature raise and causes that the drift of capacitance carries out corresponding compensation integer detecting circuit, make this near the switch working temperature greater than 80 ℃.The output of LC oscillating circuit connects 8 pin that the gained direct current signal is sent into described chip, and 5 pin of chip connect the control end of switching value output circuit.
As further improvement, 2 pin of described chip are by filter capacitor ground connection, to eliminate ripple.7 pin of this chip connect the adjustable resistance that is used for signal correction.The utility model is selected the U2136P type in the U2136 family chip for use.
The electric capacity that adopts precision ± 0.5%, temperature to float in the described LC oscillator circuit to be not more than 20PPM/ ℃ and the inductance of stranded conductor coiling.The frequency range of LC oscillator circuit is 300-500kHz.
Compared with prior art, the beneficial effects of the utility model: the temperature range that can accurately work is bigger.
Description of drawings
Fig. 1 is the utility model signals transmission figure
Fig. 2 is an electrical schematic diagram of the present utility model
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.
When ambient temperature was more higher when using, unsettled situation can appear in electronic instrument.The utility model adopts the U2136P chip, can raise to temperature to cause that the drift of capacitance carries out corresponding compensation, make this near the switch working temperature greater than 80 ℃.Based on theoretical formula have: F
2=1/4LC π
2Wherein: we can know the value and the LC relation of being inversely proportional to of frequency f by above formula for f-frequency (Hz), L-inductance (H), C-electric capacity (F), when our inductance value is fixed within the scope, just need adjust frequency of oscillation by the value of control capacittance, if it is too big that the appearance value of the electric capacity that we are used varies with temperature, the variation of frequency will be very big so, so by the service precision height, the electric capacity that low temperature floats makes entire circuit reach more stable state.
As shown in Figure 1, inductance coil is located in the induced magnetism jar, when tested metal object during near the induced magnetism jar of inductance approach switch, LC frequency of oscillation decay near switch inside, this signal will be sent into the shaping detection, pass through signal processing again, and then the control switch output variable.Also be connected with the LED lamp on the switching value output circuit, the switching value output state can be judged its on-off by this lamp.
The output of LC oscillating circuit connects 8 pin that the gained direct current signal is sent into the U2136P chip as shown in Figure 2, and 5 pin of U2136P chip connect the control end of switching value output circuit.2 pin of U2136P chip are by filter capacitor ground connection, to eliminate ripple.7 pin of U2136P chip connect the adjustable resistance that is used for signal correction.5 pin of 2136P chip are also controlled the switch of a LED, in order to the state of indicator cock amount output.In described LC oscillator circuit, adopt precision ± 0.5%, temperature to float to be 20PPM/ ℃ electric capacity and 0.05mm*60 thigh, on worker's type skeleton around 20 circles become inductance, the frequency range of LC oscillator circuit is 300-500kHz.By these measures, the utility model can be adapted to than higher working temperature.
Claims (5)
1. a high temperature modification inductance approach switch comprises high-frequency oscillating circuits, shaping detecting circuit, signal processing circuit, switching value output circuit; Described high-frequency oscillating circuits is the LC oscillating circuit, it is characterized in that signal processing circuit is is the circuit of core with the U2136 family chip; The inside of this chip is provided with temperature raise and causes that the drift of capacitance carries out corresponding compensation integer detecting circuit, and the output of LC oscillating circuit connects 8 pin that the gained direct current signal is sent into described chip, and 5 pin of chip connect the control end of switching value output circuit.
2. according to the described high temperature modification inductance approach switch of claim 1,2 pin that it is characterized in that described chip are by filter capacitor ground connection; 7 pin of this chip connect the adjustable resistance that is used for signal correction.
3. according to the described high temperature modification inductance approach switch of claim 1, it is characterized in that described U2136 family chip adopts the U2136P type.
4. according to the described high temperature modification inductance approach switch of claim 1, the electric capacity that it is characterized in that adopting precision ± 0.5%, temperature to float in the described LC oscillator circuit and be not more than 20PPM/ ℃ and the inductance of stranded conductor coiling.
5. according to claim 1 or 4 described high temperature modification inductance approach switches, the frequency range that it is characterized in that described LC oscillator circuit is 300-500kHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720040441XU CN201113963Y (en) | 2007-07-30 | 2007-07-30 | High temperature inductor type approach switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720040441XU CN201113963Y (en) | 2007-07-30 | 2007-07-30 | High temperature inductor type approach switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201113963Y true CN201113963Y (en) | 2008-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720040441XU Expired - Fee Related CN201113963Y (en) | 2007-07-30 | 2007-07-30 | High temperature inductor type approach switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201113963Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300957A (en) * | 2014-08-20 | 2015-01-21 | 上海索迪龙自动化有限公司 | High voltage resistant inductance approach switch |
| CN105319498A (en) * | 2014-08-05 | 2016-02-10 | 中国石油集团渤海钻探工程有限公司 | Proximity switch testing arrangement in high temperature environment |
-
2007
- 2007-07-30 CN CNU200720040441XU patent/CN201113963Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105319498A (en) * | 2014-08-05 | 2016-02-10 | 中国石油集团渤海钻探工程有限公司 | Proximity switch testing arrangement in high temperature environment |
| CN104300957A (en) * | 2014-08-20 | 2015-01-21 | 上海索迪龙自动化有限公司 | High voltage resistant inductance approach switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080910 Termination date: 20150730 |
|
| EXPY | Termination of patent right or utility model |