CN204886427U - Remote signalling circuit - Google Patents
Remote signalling circuit Download PDFInfo
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- CN204886427U CN204886427U CN201520661918.0U CN201520661918U CN204886427U CN 204886427 U CN204886427 U CN 204886427U CN 201520661918 U CN201520661918 U CN 201520661918U CN 204886427 U CN204886427 U CN 204886427U
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Abstract
The utility model provides a remote signalling circuit, include: N channel field effect transistor, its drain electrode is as the first input end, the opto -coupler, the positive pole of its inlet side is connected N channel field effect transistor's source electrode, current -limiting resistor, its first end with the negative pole of the inlet side of opto -coupler is connected, and its second end is as the second input, the stabiliser, its negative pole is connected N channel field effect transistor's grid, its positive pole is connected current -limiting resistor's second end, its reference edge is connected current -limiting resistor's first end. The utility model discloses a remote signalling circuit can be applicable to the input voltage of various electric pressures.
Description
Technical field
The utility model relates to remote signalling circuit, particularly relates to a kind of remote signalling circuit of wide input range.
Background technology
Remote signalling (teleindication) is also called remote signal, and remote signalling circuit is generally used for monitoring remote signals such as the actuating signals of switch position signal, power transformer interior fault signal, protective device.
With reference to figure 1, a kind of remote signalling main circuit of the prior art will comprise remote signalling input circuit and remote signalling interface circuit 12.Wherein, remote signalling interface circuit 12 mainly comprises resistance R and optocoupler 121, and remote signalling input circuit mainly comprises state dry contact 11 and power supply Vin.Therefore, this remote signalling circuit is mainly used in the on off state of detected state dry contact 11.
When the output voltage of power supply Vin changes, in order to the normal range of operation preventing optocoupler electric current from exceeding optocoupler 121, the resistance value of adjusting resistance R in prior art, is usually needed to carry out Limited Current.Therefore, adopt circuit as shown in Figure 1, need the circuit board that different electric pressure is provided according to the different electric pressures of power supply Vin, the circuit board of different brackets is provided with the resistance R of different resistance values.Such as, the circuit board of multiple different brackets such as 24V, 48V, 110V, 220V can be provided.But, such scheme for remote signalling circuit production, safeguard all can bring many puzzlements.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of remote signalling circuit, can be applicable to the input voltage of various electric pressure.
For solving the problems of the technologies described above, the utility model provides a kind of remote signalling circuit, comprising:
N channel field-effect pipe, its drain electrode is as first input end;
Optocoupler, the anode of its input side connects the source electrode of described N channel field-effect pipe;
Current-limiting resistance, its first end is connected with the negative electrode of the input side of described optocoupler, and its second end is as the second input;
Pressurizer, its negative electrode connects the grid of described N channel field-effect pipe, and its anode connects the second end of described current-limiting resistance, and its reference edge connects the first end of described current-limiting resistance.
According to an embodiment of the present utility model, described N channel field-effect pipe is depletion type N channel field-effect pipe.
According to an embodiment of the present utility model, this remote signalling circuit also comprises: the first resistance, and its first end connects the negative electrode of described pressurizer, and its second end connects the negative electrode of the input side of described optocoupler.
According to an embodiment of the present utility model, the first end of described current-limiting resistance is connected via the negative electrode of the second resistance with the input side of described optocoupler.
According to an embodiment of the present utility model, this remote signalling circuit also comprises: rectifier bridge, and its input port receives outside input voltage, and its first output connects described first input end, and its second output connects described second input.
Compared with prior art, the utility model has the following advantages:
In the remote signalling circuit of the utility model embodiment, the voltage that the voltage voltage stabilizing of current-limiting resistance both sides is extremely preset by pressurizer, when current-limiting resistance both sides voltage exceeds this predeterminated voltage, pressurizer is breakdown, the grid voltage of N channel field-effect pipe is declined, thus the electric current flowing through current-limiting resistance is reduced, the voltage also corresponding reduction at current-limiting resistance two ends, thus achieves the restriction to the electric current by optocoupler.Adopt the scheme of the utility model embodiment, no matter outside input voltage is grade, and this remote signalling circuit can realize constant current substantially, thus achieves wide range input voltage.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of remote signalling circuit in prior art;
Fig. 2 is the circuit diagram of the remote signalling circuit according to the utility model embodiment.
Embodiment
Below in conjunction with specific embodiments and the drawings, the utility model is described in further detail, but should not limit protection range of the present utility model with this.
With reference to figure 2, the remote signalling circuit of the present embodiment comprises: rectifier bridge 21, N channel field-effect pipe M1, optocoupler 22, pressurizer D1, the first resistance R1, the second resistance R2 and current-limiting resistance R3.
Wherein, rectifier bridge 21 can be diode bridge or other suitable structures.Outside input voltage vin transfers to the input port of rectifier bridge 21, through being exported by the output port of rectifier bridge 21 after over commutation.The output port of rectifier bridge 21 comprises the first output and the second output.
N channel field-effect pipe M1 is preferably depletion type N channel field-effect pipe.The drain electrode of depletion type N channel field-effect pipe M1 connects the first output of rectifier bridge 21, and the source electrode of depletion type N channel field-effect pipe M1 connects the anode of the input side of optocoupler 22, and the grid of depletion type N channel field-effect pipe M1 connects the negative electrode of pressurizer D1.
The first end of the first resistance R1 connects the grid of depletion type N channel field-effect pipe M1, and the second end connects the negative electrode of the input side of optocoupler 22.First resistance R1 is optional, in other embodiments, also can not arrange the first resistance R1.
The first end of the second resistance R1 connects the negative electrode of the input side of optocoupler 22, and second end of the second resistance R2 connects the first end of current-limiting resistance R3.
Second end of the first end contact resistance R2 of current-limiting resistance R3, second end of current-limiting resistance R3 connects the second output of rectifier bridge 21.In the present embodiment, current-limiting resistance R3 is connected to the negative electrode of the input side of optocoupler 22 indirectly via resistance R2.In other embodiments, current-limiting resistance R3 also can be connected directly to the negative electrode of the input side of optocoupler 22.
The negative electrode of pressurizer D1 connects the grid of depletion type N channel field-effect pipe M1, and the anode of pressurizer D1 connects second end of current-limiting resistance R3, and the reference edge of pressurizer D1 connects the first end of current-limiting resistance R3.As a nonrestrictive example, pressurizer D1 can be LMV431 device, and certainly, in other embodiments, pressurizer D1 can also be other suitable voltage-stabilizing devices.
It should be noted that, the first resistance R1, the second resistance R2 and current-limiting resistance R3 not refer in particular to single resistance, and it can be the equivalent resistance that the series, parallel of various resistive elements etc. is formed.In addition, rectifier bridge 21 is also optional, in other embodiments, also can not arrange rectifier bridge 21, and using the drain electrode of depletion type N channel field-effect pipe M1 and second end of current-limiting resistance R3 as two inputs.
When the path conducting of depletion type N channel field-effect pipe M1, optocoupler 22, second resistance R2, current-limiting resistance R3, electric current flows through current-limiting resistance R3.If the electric current flowing through current-limiting resistance R3 is excessive, the voltage at current-limiting resistance R3 two ends exceeds the voltage of voltage regulation of pressurizer D1 (such as, for LMV431 device, voltage of voltage regulation is 1.24V) after, pressurizer D1 conducting, the grid voltage of depletion type N channel field-effect pipe M1 is declined, flow through the electric current also just corresponding decline of depletion type N channel field-effect pipe M1, and then the electric current flowing through current-limiting resistance R3 is declined, correspondingly, the voltage at current-limiting resistance R3 two ends also declines, after voltage is tending towards the voltage of voltage regulation of pressurizer D1, the voltage at pressurizer D1 two ends also just settles out, the grid voltage of depletion type N channel field-effect pipe M1 and circulating current are also settled out.Thus, the electric current flowing through the input side of optocoupler 22 is the ratio between the resistance value of voltage of voltage regulation and current-limiting resistance R3 substantially, based on above-mentioned principle, no matter which kind of grade outside input voltage is, the electric current flowing through the input side of optocoupler 22 in this remote signalling circuit all keeps constant substantially, namely this remote signalling circuit is actually a constant-current system, thus makes this remote signalling circuit go for the input voltage of various electric pressure.
Although the utility model with preferred embodiment openly as above; but it is not for limiting the utility model; any those skilled in the art are not departing from spirit and scope of the present utility model; possible variation and amendment can be made; therefore, the scope that protection range of the present utility model should define with the utility model claim is as the criterion.
Claims (5)
1. a remote signalling circuit, is characterized in that, comprising:
N channel field-effect pipe, its drain electrode is as first input end;
Optocoupler, the anode of its input side connects the source electrode of described N channel field-effect pipe;
Current-limiting resistance, its first end is connected with the negative electrode of the input side of described optocoupler, and its second end is as the second input;
Pressurizer, its negative electrode connects the grid of described N channel field-effect pipe, and its anode connects the second end of described current-limiting resistance, and its reference edge connects the first end of described current-limiting resistance.
2. remote signalling circuit according to claim 1, is characterized in that, described N channel field-effect pipe is depletion type N channel field-effect pipe.
3. remote signalling circuit according to claim 1, it is characterized in that, also comprise: the first resistance, its first end connects the negative electrode of described pressurizer, and its second end connects the negative electrode of the input side of described optocoupler.
4. remote signalling circuit according to claim 1, is characterized in that, the first end of described current-limiting resistance is connected via the negative electrode of the second resistance with the input side of described optocoupler.
5. remote signalling circuit according to any one of claim 1 to 4, is characterized in that, also comprise: rectifier bridge, and its input port receives outside input voltage, and its first output connects described first input end, and its second output connects described second input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520661918.0U CN204886427U (en) | 2015-08-28 | 2015-08-28 | Remote signalling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520661918.0U CN204886427U (en) | 2015-08-28 | 2015-08-28 | Remote signalling circuit |
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| Publication Number | Publication Date |
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| CN204886427U true CN204886427U (en) | 2015-12-16 |
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| CN201520661918.0U Active CN204886427U (en) | 2015-08-28 | 2015-08-28 | Remote signalling circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110750127A (en) * | 2019-11-15 | 2020-02-04 | 积成电子股份有限公司 | Alternating current-direct current input voltage self-adaptation remote signaling circuit for power distribution device |
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2015
- 2015-08-28 CN CN201520661918.0U patent/CN204886427U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110750127A (en) * | 2019-11-15 | 2020-02-04 | 积成电子股份有限公司 | Alternating current-direct current input voltage self-adaptation remote signaling circuit for power distribution device |
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