CN103677029A - Alternating current active remote signaling detecting circuit - Google Patents
Alternating current active remote signaling detecting circuit Download PDFInfo
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- CN103677029A CN103677029A CN201310718562.5A CN201310718562A CN103677029A CN 103677029 A CN103677029 A CN 103677029A CN 201310718562 A CN201310718562 A CN 201310718562A CN 103677029 A CN103677029 A CN 103677029A
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Abstract
The invention discloses an alternating current active remote signaling detecting circuit which is coupled with an external alternating current power source and an external circuit. The alternating current active remote signaling detecting circuit comprises a current adjusting unit and a coupling unit. The current adjusting unit is used for carrying out current limiting processing and rectifying processing on an alternating current provided by the external alternating current power source when electricity is supplied by the external alternating current power source to generate a direct current and send the direct current to the coupling unit. The coupling unit is used for receiving the direct current sent by the current adjusting unit, and when the value of the received direct current is larger than or equal to a conduction current value, the coupling unit is conducted, the coupling processing is carried out on the received direct current to generate a high level signal and send the high level signal to the external circuit. When the value of the received direct current is smaller than the lowest conduction current value, the coupling unit is turned off, and a low level signal is generated and sent to the external circuit. The problem of the temperature rise of the alternating current active remote signaling detecting circuit is solved.
Description
Technical field
The present invention relates to electronic circuit field, specifically, relate to a kind of alternating current active remote signalling testing circuit.
Background technology
Remote signalling, acute pyogenic infection of finger tip remote signal, is the general name of all remote signalings.Remote signaling function is generally used for measuring lower column signal: the actuating signal of the position signalling of switch, power transformer interior fault integrated signal, protective device, communication facilities operation conditions signal, adjustable transformer tap position signal etc., and in widespread use and industrial circle.
In the prior art, the form that is generally rectification, capacitor charge and discharge for the testing circuit of alternating current active remote signalling as shown in Figure 1.
In the circuit shown in Fig. 1, alternating current enters circuit by input terminal, make optocoupler (U1) keep conducting in whole ac period, after the electric current adjusting of resistance (R1), voltage waveform becomes sine wave half, after the filtering by electric capacity (C1), become the conducting of direct-current drive optocoupler, finally export high level to the MCU(microcontroller of external circuit, in Fig. 1 and not shown), MCU(microcontroller) by debounce processing, produce remote signalling again and close state.When input terminal does not have alternating voltage, not conducting of optocoupler, optocoupler output low level, MCU(microcontroller) by debounce processing, produce remote signalling and divide state.
But, for this circuit, owing to first needing that electric capacity (C1) is charged, while arriving optocoupler forward voltage Deng electric capacity both end voltage, optocoupler is just understood conducting, current flowing, when alternating current is during at sinusoidal wave negative half period, capacitor discharge maintains optocoupler conducting, so resistance (R1) resistance cannot strengthen, cause electric current to become large, to such an extent as to current-limiting resistance (R1) temperature rise is very large, in order to dispel the heat, often need to distribute larger space, thereby cause the integrated level of the equipment (as: industrial instrument) with active remote signaling function low, make instrument size once large, further reduced the on-the-spot usability of instrument.
Therefore, how to solve the problem of alternating current active remote signalling testing circuit temperature rise, just become technical matters urgently to be resolved hurrily.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of alternating current active remote signalling testing circuit, to solve the problem of alternating current active remote signalling testing circuit temperature rise.
For solving the problems of the technologies described above, the invention provides a kind of alternating current active remote signalling testing circuit, couple mutually with external ac power source and external circuit, it is characterized in that, comprising: current adjustment unit and coupling unit, wherein,
Described current adjustment unit, couple mutually with described external ac power source and coupling unit, for when described external ac power source is powered, the alternating current that described external ac power source is provided carries out current limliting processing and rectification is processed, and generates DC current and is sent to described coupling unit;
Described coupling unit, couple mutually with described current adjustment unit and external circuit, the described DC current sending for receiving described current adjustment unit, when the described DC current receiving is more than or equal to electric conduction flow valuve, described coupling unit conducting, and the described DC current receiving is carried out to coupling processing, generate high level signal and be sent to described external circuit; When the described DC current receiving is less than minimum electric conduction flow valuve, described coupling unit turn-offs, and generation low level signal is sent to described external circuit.
Preferably, described current adjustment unit, consists of the first resistance and rectifying device, wherein,
Described the first resistance couples mutually with described external ac power source, couple mutually with described rectifying device simultaneously, described rectifying device couples mutually with described coupling unit again, when described external ac power source power supply, the alternating current that described the first resistance provides described external ac power source carries out current limliting processing, the value of this alternating current is limited in after the electric conduction flow valuve of described coupling unit, described rectifying device carries out rectification processing to this alternating current again, generates DC current and is sent to described coupling unit.
Preferably, described electric conduction flow valuve, is further:
Described coupling unit normally carries out the minimum current value of coupling processing.
Preferably, described the first resistance, is further current-limiting resistance.
Preferably, described rectifying device, is further commutation diode.
Preferably, described coupling unit, is further photo-coupler.
Compared with prior art, a kind of alternating current active remote signalling testing circuit of the present invention, has reached following effect:
1) the present invention no longer adopts the form of capacitor charge and discharge, remove charging capacitor, increase current-limiting resistance, by input signal, directly driven the break-make of optocoupler, not only reduce electric current but also reduced time of optocoupler conducting, thereby efficiently solved the problem of alternating current active remote signalling testing circuit temperature rise.
2) the present invention makes external input signal directly drive break-make, has greatly reduced the temperature rise of device and has taken up room, and is beneficial to the integrated of function, has increased the on-the-spot usability that adopts present device.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a part of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is alternating current active remote signalling testing circuit figure of the prior art.
The structured flowchart of the alternating current active remote signalling testing circuit described in Fig. 2 embodiment of the present invention one.
Fig. 3 is the structured flowchart of alternating current active remote signalling testing circuit of the prior art.
Fig. 4 is the structured flowchart of the alternating current active remote signalling testing circuit described in the embodiment of the present invention two.
Fig. 5 is the concrete application circuit of the alternating current active remote signalling testing circuit described in the embodiment of the present invention two.
Embodiment
As used some vocabulary in the middle of instructions and claim, censure specific components.Those skilled in the art should understand, and hardware manufacturer may be called same assembly with different nouns.This specification and claims are not used as distinguishing the mode of assembly with the difference of title, but the difference in function is used as the criterion of distinguishing with assembly.If " comprising " mentioned in the middle of instructions and claim is in the whole text an open language, therefore should be construed to " comprise but be not limited to "." roughly " refer to that in acceptable error range, those skilled in the art can solve the technical problem within the scope of certain error, reach described technique effect substantially.In addition, " couple " word and comprise directly any and electric property coupling means indirectly at this.Therefore, if describe a first device in literary composition, be coupled to one second device, represent that described first device can directly be electrically coupled to described the second device, or be indirectly electrically coupled to described the second device by other devices or the means that couple.Instructions subsequent descriptions is for implementing better embodiment of the present invention, and right described description is to illustrate that rule of the present invention is object, not in order to limit scope of the present invention.Protection scope of the present invention is when being as the criterion depending on the claims person of defining.
Below in conjunction with accompanying drawing, the present invention is described in further detail, but not as a limitation of the invention.
Embodiment mono-
As shown in Figure 1, be a kind of alternating current active remote signalling testing circuit described in the embodiment of the present invention one, couple mutually with external ac power source and external circuit, comprising: current adjustment unit 101 and coupling unit 102, wherein,
Described current adjustment unit 101, couple mutually with described external ac power source and coupling unit 102, for when described external ac power source is powered, the alternating current that described external ac power source is provided carries out current limliting processing and rectification is processed, and generates DC current and is sent to described coupling unit 102;
Described coupling unit 102, couple mutually with described current adjustment unit 101 and external circuit, the described DC current sending for receiving described current adjustment unit 101, when the described DC current receiving is more than or equal to electric conduction flow valuve, described coupling unit 102 conductings, and the described DC current receiving is carried out to coupling processing, generate high level signal and be sent to described external circuit; When the described DC current receiving is less than minimum electric conduction flow valuve, described coupling unit 102 turn-offs, and generation low level signal is sent to described external circuit.
In the present embodiment, described current adjustment unit 101, be specifically as follows the corresponding circuit structure being formed by the circuit elements device with current limliting, rectification function, certainly, it will be appreciated by those skilled in the art that, described current adjustment unit 101 can also, for having integrated chip or the device of foregoing circuit function, not form limitation of the invention at this.
Described coupling unit 102, is specifically as follows optocoupler, and the described DC current after the described current adjustment unit receiving 101 is processed is converted to after photocurrent, then carries out photoelectric coupling processing, generates high level signal and is sent to described external circuit.
Wherein, when the described minimum electric conduction flow valuve of described coupling unit 102 can be according to practical application, the device model of this coupling unit 102 is specifically determined, also can adjust according to the needs in practical application.
It should be noted that, the alternating current that described external ac power source provides (or the corresponding alternating voltage of this alternating current) has periodically, be generally 20ms(millisecond), described alternating current is fluctuation up and down within the cycle, forms sinusoidal (or cosine) formula current signal.After the described current limliting of described current adjustment unit 101 is processed, the current value of described alternating current is partly limited within the scope of the minimum electric conduction flow valuve of described coupling unit 102.Certainly, described coupling unit 102 is had no progeny in pass, and current value reduces to 0,, described coupling unit 102, because pull down resistor is drop-down, output low level.
In the present embodiment, described current adjustment unit 101 specifically can consist of the first resistance, rectifying device (as: commutation diode), and described coupling unit 102 specifically can consist of optocoupler (as: photo-coupler that model is EL816).
Particularly, described current adjustment unit 101 consists of the first resistance and rectifying device, wherein,
Described the first resistance couples mutually with described external ac power source and rectifying device, described rectifying device couples mutually with described coupling unit 202 again, when described external ac power source power supply, the alternating current that described the first resistance provides described external ac power source carries out current limliting processing, the value of this alternating current is limited in after the electric conduction flow valuve of described coupling unit 102, described rectifying device carries out rectification processing to this alternating current again, generates DC current and is sent to described coupling unit 102.
Embodiment bis-
Now, in conjunction with Fig. 2 to 4, the concrete application of described alternating current active remote signalling testing circuit is described:
As shown in Figure 2, in the prior art, in alternating current active remote signalling testing circuit owing to there being filtering circuit, first filter capacitor to be charged to after the forward voltage of optocoupler, optocoupler is just understood conducting, when the negative half period of alternating current occurs, filter capacitor will discharge and maintain optocoupler conducting, so circuit needs larger electric current.But larger electric current flows through current-limiting resistance, mean larger power consumption and more temperature rise.Therefore, in circuit structure, remove corresponding filtering circuit, increase current-limiting resistance resistance, reduce electric current, as shown in Figure 3.
In practical application, the corresponding side circuit of the circuit block diagram shown in Fig. 3 as shown in Figure 4, is described alternating current active remote signalling testing circuit corresponding side circuit in concrete application, wherein,
Circuit access external ac power source and MCU(microcontroller in Fig. 4, also not shown in Fig. 4) between, the resistance R 2 with pulldown function is carried out the electric signal of coupling unit 202 outputs drop-down to produce low level.
Particularly:
Alternating current enters circuit by input terminal, by current-limiting resistance, R1 has limited electric current, without making photo-coupler keep conducting in whole ac period, the size of current limiting only needs to make photo-coupler in each ac period (20ms), to have the time conducting of 6mS, therefore after the restriction of current-limiting resistance R1, enter commutation diode D1, saved filtering circuit and directly entered photo-coupler.
Because the ON time of photo-coupler shortens to 6ms by 20ms, so the power consumption of whole circuit declines to a great extent, the temperature rise of current-limiting resistance R1 diminishes, and can use the more device of small size, and thermal value reduces reliability and improves.Because optocoupler conducting is only 6ms, so enter MCU(microcontroller) signal waveform be square wave.
For MCU(microcontroller), by producing remote signalling after debounce processing, close state; When input terminal does not exchange when input, photo-coupler is conducting no longer, photo-coupler output low level, MCU(microcontroller) by debounce processing, produce remote signalling and divide state.
Compared with prior art, a kind of alternating current active remote signalling testing circuit of the present invention, has reached following effect:
1) the present invention no longer adopts the form of capacitor charge and discharge, remove charging capacitor, increase current-limiting resistance, by input signal, directly driven the break-make of optocoupler, not only reduce electric current but also reduced time of optocoupler conducting, thereby efficiently solved the problem of alternating current active remote signalling testing circuit temperature rise.
2) the present invention makes external input signal directly drive break-make, has greatly reduced the temperature rise of device and has taken up room, and is beneficial to the integrated of function, has increased the on-the-spot usability that adopts present device.
Above-mentioned explanation illustrates and has described some preferred embodiments of the present invention, but as previously mentioned, be to be understood that the present invention is not limited to disclosed form herein, should not regard the eliminating to other embodiment as, and can be used for various other combinations, modification and environment, and can, in invention contemplated scope described herein, by technology or the knowledge of above-mentioned instruction or association area, change.And the change that those skilled in the art carry out and variation do not depart from the spirit and scope of the present invention, all should be in the protection domain of claims of the present invention.
Claims (6)
1. an alternating current active remote signalling testing circuit, couples mutually with external ac power source and external circuit, it is characterized in that, comprising: current adjustment unit and coupling unit, wherein,
Described current adjustment unit, couple mutually with described external ac power source and coupling unit, for when described external ac power source is powered, the alternating current that described external ac power source is provided carries out current limliting processing and rectification is processed, and generates DC current and is sent to described coupling unit;
Described coupling unit, couple mutually with described current adjustment unit and external circuit, the described DC current sending for receiving described current adjustment unit, when the described DC current receiving is more than or equal to electric conduction flow valuve, described coupling unit conducting, and the described DC current receiving is carried out to coupling processing, generate high level signal and be sent to described external circuit; When the described DC current receiving is less than minimum electric conduction flow valuve, described coupling unit turn-offs, and generation low level signal is sent to described external circuit.
2. alternating current active remote signalling testing circuit as claimed in claim 1, is characterized in that, described current adjustment unit, consists of the first resistance and rectifying device, wherein,
Described the first resistance couples mutually with described external ac power source, couple mutually with described rectifying device simultaneously, described rectifying device couples mutually with described coupling unit again, when described external ac power source power supply, the alternating current that described the first resistance provides described external ac power source carries out current limliting processing, the value of this alternating current is limited in after the electric conduction flow valuve of described coupling unit, described rectifying device carries out rectification processing to this alternating current again, generates DC current and is sent to described coupling unit.
3. alternating current active remote signalling testing circuit as claimed in claim 2, is characterized in that, described electric conduction flow valuve, is further:
Described coupling unit normally carries out the minimum current value of coupling processing.
4. alternating current active remote signalling testing circuit as claimed in claim 2, is characterized in that, described the first resistance is further current-limiting resistance.
5. alternating current active remote signalling testing circuit as claimed in claim 2, is characterized in that, described rectifying device is further commutation diode.
6. as the alternating current active remote signalling testing circuit as described in arbitrary in claim 1 or 2, it is characterized in that described coupling unit is further photo-coupler.
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| CN201310718562.5A CN103677029A (en) | 2013-12-23 | 2013-12-23 | Alternating current active remote signaling detecting circuit |
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| CN201310718562.5A CN103677029A (en) | 2013-12-23 | 2013-12-23 | Alternating current active remote signaling detecting circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109828140A (en) * | 2019-02-15 | 2019-05-31 | 杭州老板电器股份有限公司 | Electric current value calculating method, device and electronic equipment |
| CN118275754A (en) * | 2024-04-10 | 2024-07-02 | 北京德锐士科技有限公司 | Isolated remote signaling state indicating circuit |
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| EP2618488A1 (en) * | 2011-10-11 | 2013-07-24 | Fuji Electric Co., Ltd. | Output signal receiving circuit for photo-coupler |
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Patent Citations (5)
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| CN1869726A (en) * | 2005-05-23 | 2006-11-29 | 海尔集团公司 | AC dynamo position contact testing circuit and method |
| US20100289461A1 (en) * | 2009-05-15 | 2010-11-18 | Chih-Liang Wang | Bridgeless power factor corrector with logic control |
| EP2618488A1 (en) * | 2011-10-11 | 2013-07-24 | Fuji Electric Co., Ltd. | Output signal receiving circuit for photo-coupler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109828140A (en) * | 2019-02-15 | 2019-05-31 | 杭州老板电器股份有限公司 | Electric current value calculating method, device and electronic equipment |
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| CN118275754A (en) * | 2024-04-10 | 2024-07-02 | 北京德锐士科技有限公司 | Isolated remote signaling state indicating circuit |
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Application publication date: 20140326 |