CN105548872A - Detection circuit and detection method for detecting on state of non-contact switch - Google Patents
Detection circuit and detection method for detecting on state of non-contact switch Download PDFInfo
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- CN105548872A CN105548872A CN201510903655.4A CN201510903655A CN105548872A CN 105548872 A CN105548872 A CN 105548872A CN 201510903655 A CN201510903655 A CN 201510903655A CN 105548872 A CN105548872 A CN 105548872A
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- Prior art keywords
- state
- resistance
- noncontacting switch
- contact switch
- switch
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention relates to the technical field of non-contact switch detection, and especially relates to a detection circuit and a detection method for detecting the on state of a non-contact switch. The detection circuit is characterized by comprising a resistor R1, a current detector L and a resistor R2, wherein the current detector L and the resistor R1 are connected to the two ends of a detected non-contact switch K after being connected in series, the non-contact switch K is connected with a power source AC and the resistor R2, and a load Z is connected in parallel to the two ends of the resistor R2. Whether the non-contact switch is in the on state can be detected reliably based on the fact that the voltage across the two ends of the non-contact switch changes when the two ends of the non-contact switch are switched on or off, and a detection result showing that the non-contact switch is in the on state can be output. A reliable basis can be provided for a safety-critical control system using the on state of the non-contact switch as a dangerous side to take safety measures.
Description
Technical field
The present invention relates to noncontacting switch detection technique field, especially relate to a kind of testing circuit and the method that detect noncontacting switch on-state.
Background technology
Noncontacting switch does not have movable contact component, do not occur electric arc or spark during turn-on and turn-off, be swift in motion, the life-span is long, superiority in Electro Magnetic Compatibility, reliability, security etc. is that contact switch is incomparable, is applicable to particular surroundings uses such as preventing fires, explosion-proof, moistureproof.Therefore noncontacting switch requires there is good application prospect in the safety control device in the very high field such as petrochemical complex, railway, space flight at safety and reliability.
The duty of noncontacting switch switches on and off two kinds, can be in different duties by controlling to realize noncontacting switch.In prior art, the object that security control equipment needs control obtains power supply and then works, otherwise does not then work, and is hazardous side when security control equipment needs the object controlled to work, and is secure side when not working; Equip the object work needing to control by can make security control to the control of noncontacting switch or do not work.When expecting that controlling noncontacting switch is in off-state, but there is unexpected on-state in the semiconductor devices failure and other reasons existed in noncontacting switch, now payload security controls equipment needs the object controlled to obtain power supply, produce the danger output not meeting and control intention, may serious consequence be caused.
Therefore, when making excessive demands system for safety requirements, must carry out detecting in real time, reliably to the whether actual on-state that is in of noncontacting switch.Whether the detection of current noncontacting switch state mainly relies in control loop exists electric current to judge its actual working state.As detected by current detector, in loop, electric current is not 0, then show that noncontacting switch is on-state.Obviously, if in the situations such as current detector fault, also current detecting may be caused incorrect, the on-state of noncontacting switch is caused to can not get reliable, correct detection, existence can not reflect noncontacting switch strictly according to the facts whether in the situation of on-state, thus causes the security control equipment adopting noncontacting switch to there is the possibility exporting hazardous side.
Summary of the invention
The object of the invention is to avoid the defect of prior art and a kind of testing circuit and the method that detect noncontacting switch on-state are provided, efficiently solve prior art Problems existing.
For achieving the above object, the technical scheme that the present invention takes is: described a kind of testing circuit detecting noncontacting switch on-state, be characterized in comprising resistance R1, current detector L and resistance R2, detected noncontacting switch K two ends are connected to after described current detector L connects with resistance R1, noncontacting switch K is connected with resistance R2 with power supply AC, the two ends shunt load Z of resistance R2.
Detect a detection method for noncontacting switch on-state, be characterized in comprising the steps:
(1), when noncontacting switch K is in on-state, the voltage at noncontacting switch K two ends is 0, and the electric current I in resistance R1 and current detector L loop is 0, and namely judge that the state of K is as connecting, testing result exports as on-state;
(2), when noncontacting switch K is in off-state, power supply AC, resistance R1, current detector L, resistance R2 form a current return, electric current I in loop is not 0, namely judges that the state of noncontacting switch K is off, and testing result exports and is off state.
Described resistance R1 and the parameter of resistance R2 determine the threshold value of circuit by adjustment, when switch in the on state, the electric current I in loop is less than threshold value; When switch is under the state disconnected, the electric current I in loop is greater than threshold value; When noncontacting switch K is in off-state, load Z is in disabled state.
The invention has the beneficial effects as follows: a kind of described testing circuit and method detecting noncontacting switch on-state, it can be changed by the voltage at two ends when switching on and off, noncontacting switch two ends and reliably detect the state whether noncontacting switch is in connection, also can output non-contact switch be the testing result of on-state, the safety_critical control system that can be hazardous side for the on-state of employing noncontacting switch takes safety measures and provides reliably foundation.
Accompanying drawing explanation
Fig. 1 is testing circuit theory structure schematic diagram of the present invention.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figure 1, described a kind of testing circuit detecting noncontacting switch on-state, be characterized in comprising resistance R1, current detector L and resistance R2, detected noncontacting switch K two ends are connected to after described current detector L connects with resistance R1, noncontacting switch K is connected with resistance R2 with power supply AC, the two ends shunt load Z of resistance R2.
Detect a detection method for noncontacting switch on-state, be characterized in comprising the steps:
(1), when noncontacting switch K is in on-state, the voltage at noncontacting switch K two ends is 0, and the electric current I in resistance R1 and current detector L loop is 0, and namely judge that the state of K is as connecting, testing result exports as on-state;
(2), when noncontacting switch K is in off-state, power supply AC, resistance R1, current detector L, resistance R2 form a current return, electric current I in loop is not 0, namely judges that the state of noncontacting switch K is off, and testing result exports and is off state.
Further, described resistance R1 and the parameter of resistance R2 determine the threshold value of circuit by adjustment, when switch in the on state, the electric current I in loop is less than threshold value; When switch is under the state disconnected, the electric current I in loop is greater than threshold value; When noncontacting switch K is in off-state, load Z is in disabled state.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. one kind is detected the testing circuit of noncontacting switch on-state, it is characterized in that comprising resistance R1, current detector L and resistance R2, detected noncontacting switch K two ends are connected to after described current detector L connects with resistance R1, noncontacting switch K is connected with resistance R2 with power supply AC, the two ends shunt load Z of resistance R2.
2. a detection method for detection noncontacting switch on-state according to claim 1, is characterized in that comprising the steps:
(1), when noncontacting switch K is in on-state, the voltage at noncontacting switch K two ends is 0, and the electric current I in resistance R1 and current detector L loop is 0, and namely judge that the state of K is as connecting, testing result exports as on-state;
(2), when noncontacting switch K is in off-state, power supply AC, resistance R1, current detector L, resistance R2 form a current return, electric current I in loop is not 0, namely judges that the state of noncontacting switch K is off, and testing result exports and is off state.
3. the detection method detecting noncontacting switch on-state as claimed in claim 2, it is characterized in that: described resistance R1 and the parameter of resistance R2 determine the threshold value of circuit by adjustment, when switch in the on state, the electric current I in loop is less than threshold value; When switch is under the state disconnected, the electric current I in loop is greater than threshold value; When noncontacting switch K is in off-state, load Z is in disabled state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510903655.4A CN105548872A (en) | 2015-12-09 | 2015-12-09 | Detection circuit and detection method for detecting on state of non-contact switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510903655.4A CN105548872A (en) | 2015-12-09 | 2015-12-09 | Detection circuit and detection method for detecting on state of non-contact switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105548872A true CN105548872A (en) | 2016-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510903655.4A Pending CN105548872A (en) | 2015-12-09 | 2015-12-09 | Detection circuit and detection method for detecting on state of non-contact switch |
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| CN (1) | CN105548872A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018107455A1 (en) * | 2016-12-16 | 2018-06-21 | 陈锡瑜 | Apparatus and method for detecting switch contact state |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5406127A (en) * | 1991-06-10 | 1995-04-11 | Mitsubishi Denki Kabushiki Kaisha | Passenger protecting apparatus |
| CN2210400Y (en) * | 1994-07-29 | 1995-10-18 | 鲁墨文 | Testing desk for non-contact switch control panel and energy consumption panel |
| CN101021719A (en) * | 2006-02-16 | 2007-08-22 | 田家玉 | Electrical measurement-based control switch and switch control socket |
| CN202206355U (en) * | 2011-08-02 | 2012-04-25 | 赖德龙 | Switch circuit and switch testing system using same |
-
2015
- 2015-12-09 CN CN201510903655.4A patent/CN105548872A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5406127A (en) * | 1991-06-10 | 1995-04-11 | Mitsubishi Denki Kabushiki Kaisha | Passenger protecting apparatus |
| CN2210400Y (en) * | 1994-07-29 | 1995-10-18 | 鲁墨文 | Testing desk for non-contact switch control panel and energy consumption panel |
| CN101021719A (en) * | 2006-02-16 | 2007-08-22 | 田家玉 | Electrical measurement-based control switch and switch control socket |
| CN202206355U (en) * | 2011-08-02 | 2012-04-25 | 赖德龙 | Switch circuit and switch testing system using same |
Non-Patent Citations (1)
| Title |
|---|
| 丁卫: "如何判断电表读数变化", 《中学生数理化 教与学》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018107455A1 (en) * | 2016-12-16 | 2018-06-21 | 陈锡瑜 | Apparatus and method for detecting switch contact state |
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Application publication date: 20160504 |