CN204302354U - Current detection circuit, measure voltage & current system and traffic lights detection architecture - Google Patents
Current detection circuit, measure voltage & current system and traffic lights detection architecture Download PDFInfo
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- CN204302354U CN204302354U CN201420807218.3U CN201420807218U CN204302354U CN 204302354 U CN204302354 U CN 204302354U CN 201420807218 U CN201420807218 U CN 201420807218U CN 204302354 U CN204302354 U CN 204302354U
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Abstract
The utility model relates to a kind of current detection circuit, measure voltage & current system and traffic lights detection architecture, wherein said current detection circuit comprises current sensing device, restrictor, first isolator, the first end of current sensing device, first end and the measured signal of restrictor are connected, second end of current sensing device, second input end and the measured signal output terminal of the first isolator are connected, second end of restrictor is connected with the first input end of the first isolator, first output terminal of the first isolator and the second output terminal are the output terminal of testing circuit, described measure voltage & current system also comprises transient voltage suppresser (TVS), the utility model also relates to a kind of traffic lights detection architecture.Adopt the current detection circuit of this kind of structure, measure voltage & current system and traffic lights detection architecture, electric current, voltage can be detected exactly, enormously simplify the structure of testing circuit simultaneously, reduce cost, have wide range of applications.
Description
Technical field
The utility model relates to electronic technology field, particularly relates to electric circuit inspection, specifically refers to a kind of current detection circuit, measure voltage & current system and traffic lights detection architecture.
Background technology
When intelligent traffic signal machine works, need the modulating voltage to signal lamp, lamp current monitors in real time, to guarantee that the control of signal lamp is accurate, and signal lamp is normal work, unspoiled.
Voltage, current detecting mode at present to signal lamp, generally separately detect, namely voltage detecting circuit and current detection circuit separate, work respectively.
Voltage detecting circuit is attempted by the two ends of load (i.e. signal lamp), by the small voltage that bleeder circuit divides, again through light every device, finally obtain can be used for the logic level detected, thus judge the power on/off situation of load (i.e. signal lamp).
Current detection circuit is then be serially connected on load (i.e. signal lamp) loop, and general technical method has two kinds:
(1) current sampling resistor detection mode;
(2) current transformer detection mode.
The first detection mode is more common, but shortcoming is not isolated between high-pressure side and low-pressure side, and needing increases buffer circuit in testing circuit rear end.The second detection mode achieves the isolation between high-pressure side and low-pressure side, but cost is higher, and the numerical value of the voltage that current transformer feeds back or electric current is all very little, as accurate detection will be accomplished, also need in addition to increase integrating circuit, not only cost increases, and testing circuit also seems very too fat to move, the control mode also more complicated detected, detects real-time slightly poor.
Utility model content
The purpose of this utility model is the shortcoming overcoming above-mentioned prior art, provides a kind ofly to detect current/voltage, the current detection circuit that simultaneously enormously simplify the structure of testing circuit, measure voltage & current system and traffic lights detection architecture exactly.
To achieve these goals, current detection circuit of the present utility model, measure voltage & current system and traffic lights detection architecture have following formation:
This current detection circuit, its principal feature is, described circuit comprises current sensing device, restrictor, the first isolator; The first end of described current sensing device, the first end of restrictor and measured signal are connected, the second end of described current sensing device, the second input end of the first isolator and measured signal output terminal are connected, second end of described restrictor is connected with the first input end of the first described isolator, and the first output terminal of the first described isolator and the second output terminal are the output terminal of described testing circuit.
Further, described current sensing device is the first resistance.
Further, described restrictor is the second resistance.
Further, the first described isolator is optoisolator.
The utility model also relates to a kind of measure voltage & current system, its principal feature is, described system comprises transient voltage suppresser, the input end of described transient voltage suppresser is connected with the first end of described current sensing device, the first end of restrictor and measured signal, and the second input end and the measured signal output terminal of the output terminal of described transient voltage suppresser and the second end of described current sensing device, the first isolator are connected.
The utility model also relates to one and traffic lights detection architecture, and its principal feature is, described structure comprises current/voltage detection system and traffic signals circuit for lamp, and the circuit of described traffic signals comprises bi-directional thyristor switch, second isolator, 3rd resistance, 4th resistance, 5th resistance, 6th resistance and the first electric capacity, the first output terminal of the second described isolator is connected with the first end of the 3rd described resistance, the second output terminal of the second described isolator, the first end of the 4th described resistance, 3rd end of bi-directional thyristor switch is connected, the second end of the 3rd described resistance, second end of bi-directional thyristor switch, the first end of the 5th resistance, be connected the second end of the 6th described resistance of the first end of the 6th resistance and civil power live wire is connected with one end of the first described electric capacity, the first end of described bi-directional thyristor switch, second end of the 5th resistance, second end of the first electric capacity, the first end of current sensing device, the first end of restrictor and the input end of transient voltage suppresser are connected, the input end of described traffic lights, second end of described current sensing device, second input end of the first isolator and the output terminal of transient voltage suppresser are connected, and the first output terminal of the first described isolator and the second output terminal are the output terminal of described current/voltage detection system.
Have employed the current detection circuit in this utility model, measure voltage & current system and traffic lights detection architecture, compared with prior art, there is following beneficial effect:
Current detection circuit of the present utility model, measure voltage & current system and traffic lights detection architecture, can detect electric current, voltage exactly, enormously simplify the structure of testing circuit simultaneously, reduce cost, have wide range of applications.
Accompanying drawing explanation
Fig. 1 is the structural representation of current detection circuit of the present utility model.
Fig. 2 is the structural representation of measure voltage & current system of the present utility model.
Fig. 3 is the structural representation of traffic lights detection architecture of the present utility model.
Embodiment
In order to more clearly describe technology contents of the present utility model, conduct further description below in conjunction with specific embodiment.
Refer to shown in Fig. 1, be the structural representation of current detection circuit of the present utility model, described circuit comprises current sensing device, restrictor, the first isolator; The first end of described current sensing device, the first end of restrictor and measured signal are connected, the second end of described current sensing device, the second input end of the first isolator and measured signal output terminal are connected, second end of described restrictor is connected with the first input end of the first described isolator, and the first output terminal of the first described isolator and the second output terminal are the output terminal of described testing circuit.
Wherein, described current sensing device is the first resistance R1, and described restrictor is the second resistance R2, and the first described isolator is optoisolator FOD814.The model of the first described resistance R1 is 220R, 1/4W.The model of the second described resistance is 22R, 2W.
The principle of work of this circuit is, when the first resistance R1 has electric current to flow through, some electric current will flow through from the second resistance R2, and such optoisolator FOD814 will open, and just can detect electric current by the output terminal detecting optoisolator FOD814.
Refer to shown in Fig. 2, for the structural representation of measure voltage & current system of the present utility model, wherein, described system comprises transient voltage suppresser TVS, the input end of described transient voltage suppresser TVS is connected with the first end of described current sensing device, the first end of restrictor and measured signal, and the second input end and the measured signal output terminal of the output terminal of described transient voltage suppresser TVS and the second end of described current sensing device, the first isolator are connected.
The principle of work of this system is, due to the circuit of purely resistive during whole testing circuit, so voltage is directly proportional to electric current, when the first resistance R1 two ends have voltage to produce, optoisolator FOD814 will be unlocked, and just can detect voltage by the output terminal detecting optoisolator FOD814.
Referring to shown in Fig. 3, is the structural representation of traffic lights detection architecture of the present utility model.Wherein, because the maximum way of traffic lights accessible in traffic signaling equipment is constantly in increase, the difficulty when carrying out measure voltage & current increases, and cost also raises, simultaneously also can hidden danger with serving stability, reliability aspect.
Adopt measure voltage & current system of the present utility model, not only improve some defects of prior art, and make manufacture more easy, cost is also cheaper.While not reducing properties of product, make its Stability and dependability, improve.
Refer to shown in Fig. 3, described structure comprises current/voltage detection system and traffic signals circuit for lamp, and the circuit of described traffic signals comprises bi-directional thyristor switch Q1, second isolator T2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, the first output terminal M1 of the 6th resistance R6 and the first electric capacity C1, the second described isolator T2 is connected with the first end of the 3rd described resistance R3, the second output terminal M2 of the second described isolator T2, the first end of the 4th described resistance R4, 3rd end of bi-directional thyristor switch Q1 is connected, second end of the 3rd described resistance R3, second end of bi-directional thyristor switch Q1, the first end of the 5th resistance R5, be connected second end of the 6th described resistance R6 of the first end of the 6th resistance R6 and civil power live wire is connected with one end of the first described electric capacity C1, the first end of described bi-directional thyristor switch Q1, second end of the 5th resistance R5, second end of the first electric capacity C1, the first end of current sensing device, the first end of restrictor and the input end of transient voltage suppresser TVS are connected, the input end of described traffic lights, second end of described current sensing device, second input end of the first isolator and the output terminal of transient voltage suppresser TVS are connected, and the first output terminal of the first described isolator and the second output terminal are the output terminal of described current/voltage detection system.
The model of the second described isolator is MOC3036.The 3rd described resistance R3 and the model of the 4th resistance R4 are 360R.The 5th described resistance R5 is thermistor, and the model of the 6th described resistance R6 is 39R, 1W.The model of the first described electric capacity C1 is 10Nf, 630V.
Wherein, the left-hand component in Fig. 3 is the driving circuit of traffic lights, and it forms primarily of the second isolator T2 and bi-directional thyristor switch Q1, and therefore not to repeat here.Postcode part in Fig. 3 is the voltage and current detection circuit of traffic lights.
The principle of work of this structure is: when bi-directional thyristor switch Q1 is opened, after signal lamp normally works, electric current is had to flow through the first resistance R1, recurrence two ends produce voltage will open the first isolator, the first isolator is made to export a detection signal, wherein, the second resistance R2 is current-limiting resistance, its objective is and prevents the first isolator to be burned.Transient voltage suppresser TVS is used for overvoltage protection, because inductive load during traffic lights, burns out the first isolator to prevent instantaneous pressure, so add that transient voltage suppresser TVS carries out overvoltage protection at the input two ends of the first isolator.
The following fault of traffic lights generally can be detected in this structure:
(1) input without alternating current 220V
Now, the first resistance R1 must not have electric current to pass through, and its both end voltage is 0, so testing result must be 0.
(2) bi-directional thyristor switch Q1 burns out
This situation is similar with situation in (1), and the first resistance R1 does not have electric current to pass through, and testing result is 0.
(3) load (i.e. traffic lights) short circuit or open circuit
Work as load short circuits, owing to being added with fuse wire before load, so once load is short-circuited, fuse just can blow, and short circuit becomes open circuit.
Work as load cut-off, then the electric current flowing through the first resistance R1 is 0, and therefore testing result is also 0.
Have employed the current detection circuit in this utility model, measure voltage & current system and traffic lights detection architecture, compared with prior art, there is following beneficial effect:
Current detection circuit of the present utility model, measure voltage & current system and traffic lights detection architecture, can detect electric current, voltage exactly, enormously simplify the structure of testing circuit simultaneously, reduce cost, have wide range of applications.
Above-described embodiment is this patent preferred embodiment; not be used for limiting practical range of the present utility model; those skilled in the art is under the prerequisite not departing from the utility model principle; the improvement done, change, combination, substitute etc., all belong within the utility model claim scope required for protection.
In this description, the utility model is described with reference to its specific embodiment.But, still can make various amendment and conversion obviously and not deviate from spirit and scope of the present utility model.Therefore, instructions and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (6)
1. a current detection circuit, is characterized in that, described circuit comprises current sensing device, restrictor, the first isolator; The first end of described current sensing device, the first end of restrictor and measured signal are connected, the second end of described current sensing device, the second input end of the first isolator and measured signal output terminal are connected, second end of described restrictor is connected with the first input end of the first described isolator, and the first output terminal of the first described isolator and the second output terminal are the output terminal of described testing circuit.
2. current detection circuit according to claim 1, is characterized in that, described current sensing device is the first resistance (R1).
3. current detection circuit according to claim 1, is characterized in that, described restrictor is the second resistance (R2).
4. current detection circuit according to claim 1, is characterized in that, the first described isolator is optoisolator (FOD814).
5. one kind realizes the system of current/voltage detection based on the current detection circuit according to any one of Claims 1-4, it is characterized in that, described system comprises transient voltage suppresser (TVS), the input end of described transient voltage suppresser (TVS) is connected with the first end of described current sensing device, the first end of restrictor and measured signal, and the output terminal of described transient voltage suppresser (TVS) is connected with the second end of described current sensing device, the second input end of the first isolator and measured signal output terminal.
6. one kind realizes the structure of traffic signals lamp current voltage detection based on current/voltage detection system according to claim 5, it is characterized in that, described structure comprises current/voltage detection system and traffic signals circuit for lamp, the circuit of described traffic signals comprises bi-directional thyristor switch (Q1), second isolator (T2), 3rd resistance (R3), 4th resistance (R4), 5th resistance (R5), 6th resistance (R6) and the first electric capacity (C1), first output terminal (M1) of described the second isolator (T2) is connected with the first end of the 3rd described resistance (R3), second output terminal (M2) of described the second isolator (T2), the first end of the 4th described resistance (R4), 3rd end of bi-directional thyristor switch (Q1) is connected, second end of the 3rd described resistance (R3), second end of bi-directional thyristor switch (Q1), the first end of the 5th resistance (R5), be connected the second end of the 6th described resistance (R6) of the first end of the 6th resistance (R6) and civil power live wire is connected with one end of described the first electric capacity (C1), the first end of described bi-directional thyristor switch (Q1), second end of the 5th resistance (R5), second end of the first electric capacity (C1), the first end of current sensing device, the input end of the first end of restrictor and transient voltage suppresser (TVS) is connected, the input end of described traffic lights, second end of described current sensing device, the output terminal of the second input end of the first isolator and transient voltage suppresser (TVS) is connected, first output terminal of the first described isolator and the second output terminal are the output terminal of described current/voltage detection system.
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| CN201420807218.3U CN204302354U (en) | 2014-12-17 | 2014-12-17 | Current detection circuit, measure voltage & current system and traffic lights detection architecture |
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| CN201420807218.3U CN204302354U (en) | 2014-12-17 | 2014-12-17 | Current detection circuit, measure voltage & current system and traffic lights detection architecture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301409A (en) * | 2015-11-17 | 2016-02-03 | 中国人民解放军海军工程大学 | Grounding fault detection and alarm circuit of frequency converter |
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2014
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301409A (en) * | 2015-11-17 | 2016-02-03 | 中国人民解放军海军工程大学 | Grounding fault detection and alarm circuit of frequency converter |
| CN105301409B (en) * | 2015-11-17 | 2018-08-14 | 中国人民解放军海军工程大学 | The Earth Fault Detection warning circuit of frequency converter |
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