CN204836659U - Multichannel differential pressure sampling circuit - Google Patents
Multichannel differential pressure sampling circuit Download PDFInfo
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- CN204836659U CN204836659U CN201520442978.3U CN201520442978U CN204836659U CN 204836659 U CN204836659 U CN 204836659U CN 201520442978 U CN201520442978 U CN 201520442978U CN 204836659 U CN204836659 U CN 204836659U
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Abstract
The utility model discloses a multichannel differential pressure sampling circuit, including main circuit and sampling circuit, the main circuit is including plural number strip power supply line, and sampling circuit includes opto -coupler, stabilivolt, first diode, the second diode the same with power supply line quantity, and the positive pole of first diode connects the power supply line respectively, and the negative pole links together, the negative pole of second diode connects the power supply line respectively, and the positive pole links together, the negative pole of first diode connects the negative pole of stabilivolt, and the positive pole of stabilivolt connects opto -coupler emitting diode's positive pole, and opto -coupler emitting diode's negative pole connects the positive pole of second diode, opto -coupler photoelectric triode's collecting electrode and the output that the projecting pole is sampling circuit. The utility model discloses be convenient for carry out voltage sample to each sampling branch road, when the voltage difference of any two power supply lines reached the setting value in the main circuit, the opto -coupler photoelectric triode switched on, output sampled signal, and sampling circuit's output can connect regulating circuit or protection circuit to reach meshes such as regulation and protection.
Description
[technical field]
The utility model relates to differential pressure sample circuit, particularly relates to a kind of multichannel differential pressure sample circuit.
[background technology]
Widely using differential pressure sampling control circuit at present all for two-way, as shown in Figure 1, to the LED electrical pressure contrast of two branch roads, is contrast one to one, so cannot be used for the LED of multiple branch circuit.In today of electronic application high speed development, the product of application multi-way LED lamp bar parallel connection gets more and more, each LED lamp bead have voltage error, so each LED lamp bar also exists voltage error, when the direct parallel connection of multi-way LED lamp bar uses, the lamp bar electric current that voltage is low will be larger, if long-term work is when big current, LED lamp bead can burn out, so will carry out the sampling of multichannel differential pressure, prevents from burning out lamp pearl.
[summary of the invention]
The technical problems to be solved in the utility model is to provide a kind of multichannel differential pressure sample circuit of being convenient to carry out each sampling branch road voltage sample comparison.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of multichannel differential pressure sample circuit, comprise main circuit and sample circuit, main circuit comprises a plurality of supply lines, sample circuit comprises optocoupler, voltage-stabiliser tube, first diode, with supply line quantity identical second diode identical with supply line quantity, and the anode of the first diode meets a supply line respectively, and the negative electrode of all first diodes links together; The negative electrode of the second diode meets a supply line respectively, and the anode of all second diodes links together; The negative electrode of the first diode connects the negative electrode of voltage-stabiliser tube, and the anode of voltage-stabiliser tube connects the anode of optocoupler light-emitting diode, and the negative electrode of optocoupler light-emitting diode connects the anode of the second diode; The collector and emitter of optocoupler phototriode is the output of sample circuit.
Above-described multichannel differential pressure sample circuit, comprises the first resistance, and the negative electrode of the first diode connects the negative electrode of voltage-stabiliser tube by the first resistance.
Above-described multichannel differential pressure sample circuit, comprises the second resistance, the anode of a termination optocoupler light-emitting diode of the second resistance, the negative electrode of another termination optocoupler light-emitting diode.
Multichannel differential pressure sample circuit of the present utility model is convenient to carry out voltage sample to each sampling branch road; when in main circuit, the voltage difference of any Liang Tiao supply line reaches set point; the conducting of optocoupler phototriode; export sampled signal; the output of sample circuit can connect regulating circuit or protective circuit, thus reaches the objects such as adjustment and protection.
[accompanying drawing explanation]
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the schematic diagram of prior art two-way differential pressure sample circuit.
Fig. 2 is the schematic diagram of the utility model embodiment multichannel differential pressure sample circuit.
[embodiment]
The structure of the utility model embodiment multichannel differential pressure sample circuit and principle are as shown in Figure 2, comprise main circuit and sample circuit, main circuit comprises Duo Tiao supply line L1-Ln, sample circuit comprises optocoupler P1, voltage-stabiliser tube Z1, first diode D1-Dn, with the supply line quantity identical second diode D11-D1n identical with supply line quantity, the anode of the first diode meets a supply line respectively, and the negative electrode of all first diode D1-Dn links together; The negative electrode of the second diode meets a supply line respectively, and the anode of all second diode D11-D1n links together.
The negative electrode of all first diodes connects the negative electrode of voltage-stabiliser tube Z1 by the first resistance, the anode of voltage-stabiliser tube Z1 connects the anode of optocoupler P1 light-emitting diode, and the negative electrode of optocoupler P1 light-emitting diode connects the anode of all second diodes; The collector and emitter of optocoupler P1 phototriode, as the output of sample circuit, connects regulating circuit or protective circuit etc., thus reaches the object regulating and protect.
The anode of one termination optocoupler P1 light-emitting diode of the second resistance, the negative electrode of another termination optocoupler P1 light-emitting diode.
The above embodiment of the utility model operation principle as follows:
As supply line L1, L2 ... when not having differential pressure or differential pressure between Ln lower than limit value, voltage-stabiliser tube Z1 not conducting, does not have electric current to flow through the light-emitting diode of optocoupler, so the phototriode of optocoupler is in cut-off state, i.e. and normal operating conditions.
As supply line L1, L2 ... when Ln has that between any two circuits, differential pressure is higher than limit value, voltage-stabiliser tube Z1 conducting, electric current flows through from the light-emitting diode of optocoupler, the phototriode of optocoupler will enter amplification or saturation conduction state, such as, has differential pressure (VL1>VL2) between L1 and L2, and differential pressure is when reaching limit value, electric current will from circuit L1 through diode D1, resistance R1, voltage-stabiliser tube Z1, optocoupler P1 (R2), D21 flows to circuit L2.
The differential pressure limit value of the above embodiment of the utility model independently can set according to service condition, differential pressure limit value Vth=2*VD+VZ1+VDP1+R1* (VDP1/R2); Vth: differential pressure limit value; VD is D1 ... the conduction voltage drop of Dn, D11 ... the N of the conduction voltage drop of D1n, the voltage stabilizing value of voltage-stabiliser tube Z1, optocoupler P1 is each.
Optocoupler light emitting transistor is connected on the function regulating the circuit of electric current or regulation voltage can realize adjusting voltage or electric current, is connected on the function that protective circuit can realize protecting.In superincumbent circuit, resistance R1 plays metering function, and resistance R2 arranges bias current, plays the effect preventing leakage current from causing misoperation.
The above embodiment of the utility model effectively can carry out differential pressure sampling to multiple-channel output.Sampling is reached accurately, the effect that differential pressure limit value is adjustable by this circuit application.
Above a kind of multichannel differential pressure sample circuit provided by the utility model is described in detail, apply specific case herein to set forth principle of the present utility model and execution mode, the explanation of above embodiment just understands core concept of the present utility model for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (3)
1. a multichannel differential pressure sample circuit, comprise main circuit and sample circuit, main circuit comprises a plurality of supply lines, it is characterized in that, sample circuit comprises optocoupler, voltage-stabiliser tube, first diode, with supply line quantity identical second diode identical with supply line quantity, the anode of the first diode meets a supply line respectively, and the negative electrode of all first diodes links together; The negative electrode of the second diode meets a supply line respectively, and the anode of all second diodes links together; The negative electrode of the first diode connects the negative electrode of voltage-stabiliser tube, and the anode of voltage-stabiliser tube connects the anode of optocoupler light-emitting diode, and the negative electrode of optocoupler light-emitting diode connects the anode of the second diode; The collector and emitter of optocoupler phototriode is the output of sample circuit.
2. multichannel differential pressure sample circuit according to claim 1, is characterized in that, comprise the first resistance, and the negative electrode of the first diode connects the negative electrode of voltage-stabiliser tube by the first resistance.
3. multichannel differential pressure sample circuit according to claim 1, is characterized in that, comprise the second resistance, the anode of a termination optocoupler light-emitting diode of the second resistance, the negative electrode of another termination optocoupler light-emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520442978.3U CN204836659U (en) | 2015-06-25 | 2015-06-25 | Multichannel differential pressure sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520442978.3U CN204836659U (en) | 2015-06-25 | 2015-06-25 | Multichannel differential pressure sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204836659U true CN204836659U (en) | 2015-12-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520442978.3U Active CN204836659U (en) | 2015-06-25 | 2015-06-25 | Multichannel differential pressure sampling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204836659U (en) |
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2015
- 2015-06-25 CN CN201520442978.3U patent/CN204836659U/en active Active
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