CN103235256A - Isolation detecting device and method of switch on-and-off states - Google Patents
Isolation detecting device and method of switch on-and-off states Download PDFInfo
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- CN103235256A CN103235256A CN2013101171671A CN201310117167A CN103235256A CN 103235256 A CN103235256 A CN 103235256A CN 2013101171671 A CN2013101171671 A CN 2013101171671A CN 201310117167 A CN201310117167 A CN 201310117167A CN 103235256 A CN103235256 A CN 103235256A
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Abstract
The invention discloses an isolation detecting device and a method of switch on-and-off states. The isolation detecting device comprises a signal generator (1), an adapting resistor (2), a single-phase transformer (3), an alternating-voltage voltmeter (5) and a switch to be detected (4). A sinusoidal alternating signal source is outputted to the primary side of the single-phase transformer (3) via the adapting resistor (2) by the signal generator (1), and the secondary side of the single-phase transformer (3) is connected with the switch to be detected (4) in a parallel manner. State changes of switch signals are transferred into typical circuit conditions of the single-phase transformer in zero load and short circuit, voltage changes of two ends of the primary side of the single-phase transformer (3) are monitored by an alternating-voltage voltmeter (5) to detect the state of the switch to be detected. Signal features of the switch signals are utilized, isolation detection of the signals can be realized through circuit equivalence, system power consumption is low, limit of optocouplers is eliminated, reliability is improved, and the isolation detecting device is adaptable to site requirement on general isolation detection of the switch on-and-off states.
Description
Technical field
The present invention relates to a kind of novel switch on and off state isolation pick-up unit and method, be applicable to the generalized case that need detect the switch on off operating mode, belong to the passive isolation detection technical field of switching value signal.
Background technology
Switching signal is the signal under a kind of static state, different with simulating signal is, the signal of switching signal changes discontinuous, has only 0,1 two states, it is a kind of signal of jumping type, so be referred to as pulse signal again, but it has better anti-jamming capability, so be widely used in the processing of modern electronic technology signal.
In the general industrial scene, the signal transmission of carrying out between the electrical equipment that distance is far away, instrument, the control system etc. often exists all kinds of interference, causes instability or even the maloperation of system.Therefore, in the TT﹠C system of reality is used, at the state-detection of switching signal, seal in system for fear of the undesired signal at scene, switch on and off signal and power supply need be isolated.
Signal Isolation Technology commonly used at present mainly is divided into magnetic isolation and light isolation two big classes, and concrete application generally can roughly be divided into two kinds of situations: one, the switching value signal adopts light to isolate; Two, analog signals adopts magnetic to isolate.
Light is isolated in application that signal isolates comparative maturity, often is made up of optocoupler and peripheral circuit thereof.Photo-coupler can be realized the one-way transmission of signal, and antijamming capability is strong, working stability, and the transfer efficiency height is applicable to the isolation of digital signal, but its major defect is that power consumption is bigger, and can not realize passive isolation.
Summary of the invention
Technical matters to be solved by this invention is: overcome the deficiency of existing switching signal isolation detection technology, eliminate the dependence to power supply, realize the isolation detection to the switch on off operating mode under passive situation.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of switch on and off state isolation pick-up unit, comprise signal generator, adaptive resistance, single transformer, A.C. voltmeter, switch to be detected, wherein, described signal generator is used for the sinusoidal ac signal source is provided, and single transformer is exported to through adaptive resistance in this sinusoidal ac signal source; Described A.C. voltmeter is parallel to the primary side of single transformer, and with the primary side of described single transformer ground connection altogether; Secondary side and the measured switch of described single transformer are connected in parallel, and the two ends of measured switch are connected with peripheral circuit.
As the further preferred version of a kind of switch on and off state isolation pick-up unit of the present invention, described signal generator provides the sinusoidal ac signal of an amplitude, fixed-frequency.
As the further preferred version of a kind of switch on and off state isolation pick-up unit of the present invention, described adaptive resistance is used for adjusting the voltage that signal generator is exported to single transformer, and its resistance value size is carried out adaptive selection according to transformer parameter.
The present invention also proposes a kind of detection method of switch on and off state isolation pick-up unit, galvanomagnetic effect when utilizing single transformer zero load and short circuit, typical circuit situation when the state variation of switch on and off signal is converted into single transformer zero load and short circuit, adopt the voltage swing at A.C. voltmeter monitoring single transformer primary side two ends, indirect detection goes out the on off operating mode of measured switch, realizes the isolation detection of switch on and off state.
Further, a kind of detection method of switch on and off state isolation pick-up unit, the voltage swing at described employing A.C. voltmeter monitoring single transformer primary side two ends, the on off operating mode that indirect detection goes out measured switch is embodied in:
When measured switch disconnects, the secondary side zero load of single transformer, all for the power consumption of the primary side of single transformer, the primary side both end voltage of single transformer is the voltage after partial value to the voltage of signal generator input;
When measured switch was closed, the secondary circuit short-circuit of single transformer because the short-circuit impedance of single transformer is very little, reduced so the primary side both end voltage value of the measured single transformer of A.C. voltmeter has obviously;
Change namely from the registration of observing A.C. voltmeter that this moment, measured switch was to be in to disconnect or closure state as can be known.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
The present invention utilizes the characteristics of signals of switch on and off signal, realizes the isolation detection of its signal by circuit equivalent, and system power dissipation is low and break away from the constraint of optocoupler.Realize passive isolation on the basis that solves original problem simultaneously, reduce to disturb, improved the reliability of system, fully satisfy the needs of on-the-spot actual measurement.
Description of drawings
Fig. 1 is theory diagram of the present invention.
Number in the figure: 1: signal generator; 2: adaptive resistance; 3: single transformer; 4: switch to be detected; 5: A.C. voltmeter; 6: publicly.
Fig. 2 is the circuit equivalent figure when switch disconnects of the present invention.
Fig. 3 is the circuit reduction figure when switch disconnects of the present invention.
Fig. 4 is the circuit equivalent figure when switch closure of the present invention.
Fig. 5 is the circuit reduction figure when switch closure of the present invention.
Fig. 6 be of the present invention when switch disconnects and is closed the desired voltage variation diagram at transformer primary side two ends.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is described in further detail:
As shown in Figure 1, switch on and off state isolation testing circuit composition of the present invention comprises: signal generator 1, adaptive resistance 2, single transformer 3, measured switch 4, A.C. voltmeter 5.Wherein:
Signal generator 1 is for system provides the sinusoidal ac signal source.
Measured switch 4 is connected with the related peripheral circuit.
A.C. voltmeter 5 is mainly used in measuring the both end voltage value of single transformer 3 primary sides, with 3 side joints of single transformer publicly 6.
During concrete enforcement, when measured switch 4 is in off-state, the transformer with galvanomagnetic effect is replaced with an equivalent electrical circuit, as shown in Figure 2.Circuit Fault on Secondary Transformer opens circuit, and transformer is in light condition, at this moment the electric current in the primary side
Be exciting curent
, the output of transformer inactivity, so the voltage of transformer is exported to all for the transformer internal consumption in the AC signal source, side leakage impedance again
, inductance
So, the primary side leakage impedance
Can ignore, circuit reduction is for as shown in Figure 3, so the measured magnitude of voltage of A.C. voltmeter is excitatory impedance
With the value after the adaptive resistance R dividing potential drop.
When switch is in closure state, equally transformer is replaced with an equivalent electrical circuit, as shown in Figure 4, Short Circuit Fault on Secondary Transformer, transformer is in short-circuit condition, the voltage of transformer is exported to for the leakage impedance pressure drop that overcomes transformer inside in the AC signal source, and the main flux in the transformer is very little, therefore excitatory impedance
Can ignore, circuit reduction is for as shown in Figure 5, wherein resistance
, inductance
, the short-circuit impedance of transformer this moment again
Very little, and short-circuit current is ratings, so the measured short-circuit voltage of A.C. voltmeter is compared with the voltage that records before, tangible pressure drop difference is arranged.
Therefore, just can detect corresponding on off state according to the measured different magnitudes of voltage of voltage table under the different on off states, the voltage of surveying waveform in the ideal case as shown in Figure 6.
Claims (5)
1. switch on and off state isolation pick-up unit, it is characterized in that: comprise signal generator (1), adaptive resistance (2), single transformer (3), A.C. voltmeter (5), switch to be detected (4), wherein, described signal generator (1) is used for the sinusoidal ac signal source is provided, and single transformer (3) is exported to through adaptive resistance (2) in this sinusoidal ac signal source; Described A.C. voltmeter (5) is parallel to the primary side of single transformer (3), and with the primary side of described single transformer (3) ground connection altogether; The secondary side of described single transformer (3) and measured switch (4) are connected in parallel, and the two ends of measured switch (4) are connected with peripheral circuit.
2. a kind of switch on and off state isolation pick-up unit according to claim 1, it is characterized in that: described signal generator (1) provides the sinusoidal ac signal of an amplitude, fixed-frequency.
3. a kind of switch on and off state isolation pick-up unit according to claim 1, it is characterized in that: described adaptive resistance (2) is used for adjusting signal generator (1) and exports to the voltage of single transformer (3), and its resistance value size is carried out adaptive selection according to transformer parameter.
4. according to the detection method of the arbitrary described a kind of switch on and off state isolation pick-up unit of claim 1-3, it is characterized in that:
Galvanomagnetic effect when utilizing single transformer (3) zero load and short circuit, typical circuit situation when the state variation of switch on and off signal is converted into single transformer (3) zero load and short circuit, adopt the voltage swing at A.C. voltmeter (5) monitoring single transformer (3) primary side two ends, indirect detection goes out the on off operating mode of measured switch (4), realizes the isolation detection of switch on and off state.
5. the detection method of a kind of switch on and off state isolation pick-up unit according to claim 4, it is characterized in that: the voltage swing at described employing A.C. voltmeter (5) monitoring single transformer (3) primary side two ends, the on off operating mode that indirect detection goes out measured switch (4) is embodied in:
When measured switch (4) disconnects, the secondary side zero load of single transformer (3), all for the power consumption of the primary side of single transformer (3), the primary side both end voltage of single transformer (3) is the voltage after partial value to the voltage of signal generator (1) input;
When measured switch (4) was closed, the secondary circuit short-circuit of single transformer (3) because the short-circuit impedance of single transformer (3) is very little, reduced so the primary side both end voltage value of the measured single transformer of A.C. voltmeter (5) (3) has obviously;
Changing namely as can be known from the registration of observing A.C. voltmeter (5), measured switch this moment (4) is to be in to disconnect or closure state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101171671A CN103235256A (en) | 2013-04-07 | 2013-04-07 | Isolation detecting device and method of switch on-and-off states |
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| CN2013101171671A CN103235256A (en) | 2013-04-07 | 2013-04-07 | Isolation detecting device and method of switch on-and-off states |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728556A (en) * | 2013-12-27 | 2014-04-16 | 河南辉煌科技股份有限公司 | On-off state signal collecting method and on-off state signal collecting circuit |
| CN105510812A (en) * | 2015-10-12 | 2016-04-20 | 国家电网公司 | Converter transformer tap switch condition monitoring system and non-stationary signal spectrum estimation method |
| CN107179496A (en) * | 2016-03-10 | 2017-09-19 | 施耐德电气工业公司 | Method and apparatus for the state of detection switch |
| CN109814017A (en) * | 2017-11-20 | 2019-05-28 | 国网上海市电力公司 | The IGBT on off operating mode detection circuit and its detection method of three-phase phase-change switch and application |
| CN111879987A (en) * | 2020-07-16 | 2020-11-03 | 北京瑞赛长城航空测控技术有限公司 | High-voltage-resistant isolated contact detection circuit |
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| JPH09211089A (en) * | 1996-01-30 | 1997-08-15 | Mitsubishi Electric Corp | Circuit breaker and testing device thereof |
| CN201489089U (en) * | 2009-08-25 | 2010-05-26 | 广州粤能电力科技开发有限公司 | Switching value measuring circuit |
| CN102720492A (en) * | 2012-05-29 | 2012-10-10 | 三一重型装备有限公司 | Development machine and on-off state detecting device of development machine |
| CN203217053U (en) * | 2013-04-07 | 2013-09-25 | 河海大学 | Passive isolation detection apparatus of switch signal |
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2013
- 2013-04-07 CN CN2013101171671A patent/CN103235256A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09211089A (en) * | 1996-01-30 | 1997-08-15 | Mitsubishi Electric Corp | Circuit breaker and testing device thereof |
| CN201489089U (en) * | 2009-08-25 | 2010-05-26 | 广州粤能电力科技开发有限公司 | Switching value measuring circuit |
| CN102720492A (en) * | 2012-05-29 | 2012-10-10 | 三一重型装备有限公司 | Development machine and on-off state detecting device of development machine |
| CN203217053U (en) * | 2013-04-07 | 2013-09-25 | 河海大学 | Passive isolation detection apparatus of switch signal |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728556A (en) * | 2013-12-27 | 2014-04-16 | 河南辉煌科技股份有限公司 | On-off state signal collecting method and on-off state signal collecting circuit |
| CN103728556B (en) * | 2013-12-27 | 2016-08-24 | 河南辉煌科技股份有限公司 | A kind of switch state signal acquisition method and switch state signal Acquisition Circuit |
| CN105510812A (en) * | 2015-10-12 | 2016-04-20 | 国家电网公司 | Converter transformer tap switch condition monitoring system and non-stationary signal spectrum estimation method |
| CN107179496A (en) * | 2016-03-10 | 2017-09-19 | 施耐德电气工业公司 | Method and apparatus for the state of detection switch |
| CN109814017A (en) * | 2017-11-20 | 2019-05-28 | 国网上海市电力公司 | The IGBT on off operating mode detection circuit and its detection method of three-phase phase-change switch and application |
| CN111879987A (en) * | 2020-07-16 | 2020-11-03 | 北京瑞赛长城航空测控技术有限公司 | High-voltage-resistant isolated contact detection circuit |
| CN111879987B (en) * | 2020-07-16 | 2023-10-20 | 北京瑞赛长城航空测控技术有限公司 | High-voltage-resistant isolated contact detection circuit |
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Application publication date: 20130807 |