CN203217053U - Passive isolation detection apparatus of switch signal - Google Patents
Passive isolation detection apparatus of switch signal Download PDFInfo
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- CN203217053U CN203217053U CN 201320169076 CN201320169076U CN203217053U CN 203217053 U CN203217053 U CN 203217053U CN 201320169076 CN201320169076 CN 201320169076 CN 201320169076 U CN201320169076 U CN 201320169076U CN 203217053 U CN203217053 U CN 203217053U
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- signal
- isolation detection
- switch
- transformer
- passive isolation
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Abstract
The utility model discloses a passive isolation detection apparatus of a switch signal. The passive isolation detection apparatus comprises a signal generator (1), an adaptive resistor (2), a single-phase transformer (3), an alternating-current voltmeter (5), and a switch (4) to be detected, wherein the signal generator (1) outputs a sine alternating-current signal source to a primary side of the single-phase transformer (3) through the adaptive resistor (2), and a secondary side of the single-phase transformer (3) is connected in parallel with the switch (4) to be detected. The passive isolation detection apparatus converts the change of the state of the switch signal into the typical circuit situation in the case of empty load and short circuit of the single-phase transformer and utilizes the alternating-current voltmeter (5) to monitor the change of the magnitude of voltage at the two ends of the primary side of the single-phase transformer, thereby detecting the state of the switch to be detected. The passive isolation detection apparatus is low in system power consumption, free of bondage of optical coupling devices, improved in reliability, and applicable to the on-site requirement of the isolation detection of the on-off state of common switches.
Description
Technical field
The utility model relates to the passive isolation detection device of a kind of novel switching signal, is applicable to the generalized case that need detect the switch signal condition, belongs to the passive isolation detection technical field of switching value signal.
Background technology
Switching signal is called the amount of opening the light signal again, it is a kind of digital signal, different with simulating signal is, the signal of switching signal changes discontinuous, having only 0,1 two states, 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, switching 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.
The utility model content
Technical problem to be solved in the utility model is: overcome the deficiency of existing switching signal isolation detection technology, eliminate the dependence to power supply, realize the isolation detection to switching signal under passive situation.
The utility model is for solving the problems of the technologies described above by the following technical solutions:
A kind of passive isolation detection device of switching signal, 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 the passive isolation detection device of a kind of switching signal of the present utility model, described signal generator provides the sinusoidal ac signal of an amplitude, fixed-frequency.
As the further preferred version of the passive isolation detection device of a kind of switching signal of the present utility model, 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.
Galvanomagnetic effect when the utility model utilizes single transformer zero load and short circuit, typical circuit situation when the state variation of switching 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 passive isolation detection of switching signal.
Be 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 utility model adopts above technical scheme compared with prior art, has following technique effect:
The utility model utilizes the characteristics of signals of switching 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 utility model.
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 utility model.
Fig. 3 is the circuit reduction figure when switch disconnects of the present utility model.
Fig. 4 is the circuit equivalent figure when switch closure of the present utility model.
Fig. 5 is the circuit reduction figure when switch closure of the present utility model.
Fig. 6 be of the present utility model when switch disconnects and is closed the desired voltage variation diagram at transformer primary side two ends.
Embodiment
Below in conjunction with accompanying drawing the technical solution of the utility model is described in further detail:
As shown in Figure 1, the passive isolation detection device composition of a kind of switching signal of the present utility model comprises: signal generator 1, adaptive resistance 2, single transformer 3, measured switch 4, A.C. voltmeter 5.Wherein:
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 equivalent electrical circuit of transformer 3 usefulness with galvanomagnetic effect is replaced, as shown in Figure 2.Circuit Fault on Secondary Transformer opens circuit, and transformer is in light condition, at this moment the electric current I in the primary side
0Be exciting curent I
m, the output of transformer inactivity, so the voltage of single transformer is exported to all for the transformer internal consumption in the AC signal source, another side leakage impedance R
1＜＜R
m, X
1＜＜X
mSo, primary side leakage impedance Z
1=R
1+ jX
1Can ignore, circuit reduction is for as shown in Figure 3, so the measured magnitude of voltage of A.C. voltmeter is excitatory impedance Z
m=R
m+ jX
mWith 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, signal source is exported to the voltage of transformer for the leakage impedance pressure drop that overcomes transformer inside, and the main flux in the transformer is very little, therefore excitatory impedance Z
m=R
m+ jX
mCan ignore, circuit reduction is for as shown in Figure 5, wherein R
k=R
1+ R
2, X
k=X
1+ X
2, the short-circuit impedance Z of transformer this moment again
k=R
k+ jX
kVery 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 (3)
1. the passive isolation detection device of a switching signal, 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. the passive isolation detection device of a kind of switching signal according to claim 1, it is characterized in that: described signal generator (1) provides the sinusoidal ac signal of an amplitude, fixed-frequency.
3. the passive isolation detection device of a kind of switching signal 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320169076 CN203217053U (en) | 2013-04-07 | 2013-04-07 | Passive isolation detection apparatus of switch signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320169076 CN203217053U (en) | 2013-04-07 | 2013-04-07 | Passive isolation detection apparatus of switch signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203217053U true CN203217053U (en) | 2013-09-25 |
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ID=49206578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320169076 Expired - Fee Related CN203217053U (en) | 2013-04-07 | 2013-04-07 | Passive isolation detection apparatus of switch signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203217053U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235256A (en) * | 2013-04-07 | 2013-08-07 | 河海大学 | Isolation detecting device and method of switch on-and-off states |
-
2013
- 2013-04-07 CN CN 201320169076 patent/CN203217053U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235256A (en) * | 2013-04-07 | 2013-08-07 | 河海大学 | Isolation detecting device and method of switch on-and-off states |
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| 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: 20130925 Termination date: 20160407 |
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| CF01 | Termination of patent right due to non-payment of annual fee |