CN203966976U - A kind of direct current relay drive circuit - Google Patents
A kind of direct current relay drive circuit Download PDFInfo
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- CN203966976U CN203966976U CN201420276815.8U CN201420276815U CN203966976U CN 203966976 U CN203966976 U CN 203966976U CN 201420276815 U CN201420276815 U CN 201420276815U CN 203966976 U CN203966976 U CN 203966976U
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- schmidt trigger
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- 239000004065 semiconductor Substances 0.000 claims abstract description 37
- 239000003990 capacitor Substances 0.000 claims description 21
- 230000001052 transient effect Effects 0.000 claims description 12
- 230000001629 suppression Effects 0.000 claims description 10
- 229910052732 germanium Inorganic materials 0.000 claims description 4
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 9
- 230000006698 induction Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of direct current relay drive circuit, relate to relay field, this drive circuit comprises relay drive unit and signal isolated location, and the output of signal isolated location is connected with the input of relay drive unit; Described signal isolated location comprises the first Schmidt trigger U1, the second Schmidt trigger U2, the 3rd Schmidt trigger U3, photoelectrical coupler, the first resistance R 1 and the second resistance R 2; Described electrical equipment driver element comprises relay R Y, the 3rd resistance R 3, current-limiting resistance R4, the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4 and metal-oxide-semiconductor Q1, and the input of the 3rd Schmidt trigger U3 of described electrical equipment driver element is connected with the 3rd resistance R 3 of signal isolated location.The utility model is not only safer, and use cost is lower.
Description
Technical field
The utility model relates to relay field, is specifically related to a kind of direct current relay drive circuit.
Background technology
The driving power of direct current relay drive circuit and control signal circuit for generating directly altogether, when direct current relay is closed, need larger drive current at present.
During existing relay drive circuit uses, in the time of direct current relay frequent starting, in direct current relay drive circuit curent change frequent, amplitude is all larger.Because the induction coil of direct current relay is inductive element, the induction coil of relay is frequent at electric current, amplitude is all worked under larger condition, easily damage power supply and other circuit elements of control signal circuit for generating, direct current relay drive circuit after damage need to be changed just and can reuse, and use cost is higher.
Utility model content
For the defect existing in prior art, the purpose of this utility model is to provide a kind of direct current relay drive circuit, not only safer, and use cost is lower.
For reaching above object, the technical scheme that the utility model is taked is: a kind of direct current relay drive circuit, comprise relay drive unit, it is characterized in that: also comprise signal isolated location, the output of signal isolated location is connected with the input of relay drive unit;
Described signal isolated location comprises the first Schmidt trigger U1, the second Schmidt trigger U2, the 3rd Schmidt trigger U3, photoelectrical coupler, the first resistance R 1 and the second resistance R 2; Described photoelectrical coupler comprises Light-Emitting Diode D6 and luminous triode Q2;
The input of described the first Schmidt trigger U1 is connected with external control signal, output is connected with the input of the second Schmidt trigger U2, the output of the second Schmidt trigger U2 is the anodic bonding with Light-Emitting Diode D6 by the first resistance R 1, the minus earth of Light-Emitting Diode D6;
The base stage coupling of the negative electrode of Light-Emitting Diode D6 and luminous triode Q2, the collector electrode of light emitting transistor Q2 is connected with external power supply by the second resistance R 2, the collector electrode of light emitting transistor Q2 is connected with the input of the 3rd Schmidt trigger U3, and the emitter of light emitting transistor Q2 connects equipotential;
Described electrical equipment driver element comprises relay R Y, the 3rd resistance R 3, current-limiting resistance R4, the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4 and metal-oxide-semiconductor Q1, and the first diode D1 selects unidirectional transient diode; Relay R Y is provided with fixed contact and moving contact, and metal-oxide-semiconductor Q1 is provided with grid g, drain electrode d and source electrode s;
The output of the 3rd Schmidt trigger U3 is connected with the grid g of metal-oxide-semiconductor Q1 by the 3rd resistance R 3, and the drain electrode d of metal-oxide-semiconductor Q1 is connected with the fixed contact of relay R Y, and the source electrode s of metal-oxide-semiconductor Q1 connects equipotential;
The anode of described the first diode D1 is connected with the grid g of metal-oxide-semiconductor Q1, and negative electrode is connected with the source electrode s of metal-oxide-semiconductor Q1; The anode of described the second diode D2 is connected with the drain electrode d of metal-oxide-semiconductor Q1, and negative electrode is connected with the source electrode s of metal-oxide-semiconductor Q1; The anode of described the 3rd diode D3 is connected with the moving contact of relay R Y, and negative electrode is connected with the fixed contact of relay R Y; The anode of described the 4th diode D4 is connected with the moving contact of relay R Y, and negative electrode is connected with external power supply by current-limiting resistance R4.
On the basis of technique scheme, described signal isolated location also comprises the first filter capacitor C1, and the first filter capacitor C1 is in parallel with Light-Emitting Diode D6.
On the basis of technique scheme, described signal isolated location also comprises the second filter capacitor C2, one end of the second filter capacitor C2 is connected with the collector electrode of light emitting transistor Q2, and the other end is connected with the emitter of light emitting transistor Q2, and the other end of the second filter capacitor C2 connects equipotential simultaneously.
On the basis of technique scheme, described signal isolated location also comprises high-voltage capacitance C3, and high-voltage capacitance C3 is in parallel with the 3rd diode D3.
On the basis of technique scheme, described signal isolated location also comprises the 5th diode D5, and the 5th diode D5 is in parallel with the 3rd diode D3.
On the basis of technique scheme, described the 5th diode D5 selects two-way Transient Suppression Diode.
On the basis of technique scheme, it is the Schmidt trigger of CD40106 that described the first Schmidt trigger U1, the second Schmidt trigger U2, the 3rd Schmidt trigger U3 all select model.
On the basis of technique scheme, described the second diode D2 selects unidirectional Transient Suppression Diode.
On the basis of technique scheme, described the 3rd diode D3 selects and holds stream diode, and the 4th diode D4 selects germanium diode.
On the basis of technique scheme, described metal-oxide-semiconductor Q1 selects N-channel MOS pipe.
Compared with prior art, the utility model has the advantage of:
(1) direct current relay drive circuit of the present utility model comprises the first diode D1 and current-limiting resistance R4, the first diode D1 is unidirectional Transient Suppression Diode, in the time that the power frequency in circuit, size variation are very fast, the first diode D1 can protect metal-oxide-semiconductor Q1 effectively; The utility model can be by regulating the resistance size of current-limiting resistance R4, size of current in the coil of control relay RY, avoid the excessive coil that causes relay R Y of coil current to be burnt,, amplitude frequent at electric current with the induction coil of prior art repeat circuit RY all worked under larger condition, the power supply that easily damages control signal circuit for generating is compared with other circuit elements, the utility model is safer, and useful life is longer, can effectively reduce use cost.
(2) the utility model comprises the first filter capacitor C1, the second filter capacitor C2, high-voltage capacitance C3 and the 5th diode D5, and the first filter capacitor C1, the second filter capacitor C2 are filter capacitor, can make the voltage at photoelectrical coupler two ends more stable; High-voltage capacitance C3 can avoid relay R Y coil disturbed; D5 is two-way Transient Suppression Diode, can suppress relay R Y coil both end voltage excessive, has effectively ensured the use safety of photoelectrical coupler and relay R Y.
Brief description of the drawings
Fig. 1 is the circuit diagram of a kind of direct current relay drive circuit in the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
Shown in Figure 1, the utility model embodiment provides a kind of direct current relay drive circuit, and this drive circuit comprises signal isolated location and relay drive unit, and the output of signal isolated location is connected with the input of relay drive unit.
Signal isolated location comprises the first Schmidt trigger U1, the second Schmidt trigger U2, the 3rd Schmidt trigger U3, photoelectrical coupler, the first resistance R 1, the second resistance R 2, the first filter capacitor C1 and the second filter capacitor C2.Photoelectrical coupler comprises Light-Emitting Diode D6 and light emitting transistor Q2, and the model of photoelectrical coupler is TLP181.
The input of the first Schmidt trigger U1 is connected with external control signal, output is connected with the input of the second Schmidt trigger U2, the output of the second Schmidt trigger U2 is the anodic bonding with Light-Emitting Diode D6 by the first resistance R 1, the base stage coupling of the negative electrode of Light-Emitting Diode D6 and light emitting transistor Q2, the minus earth of Light-Emitting Diode D6.
The anodic bonding of one end of the first filter capacitor C1 and Light-Emitting Diode D6, the other end is connected with the negative electrode of Light-Emitting Diode D6, simultaneously ground connection.
The base stage of light emitting transistor Q2 is connected with the negative electrode of Light-Emitting Diode D6, and the collector electrode of light emitting transistor Q2 is connected with external power supply by the second resistance R 2, and the emitter of light emitting transistor Q2 connects equipotential.
Between the collector and emitter of light emitting transistor Q2, be provided with the second filter capacitor C2.
The input of the 3rd Schmidt trigger U3 is connected with the collector electrode of light emitting transistor Q2, and output is connected with the input of relay R Y driver element.
Electrical equipment driver element comprises relay R Y, the 3rd resistance R 3, current-limiting resistance R4, high-voltage capacitance C3, the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5, high-voltage capacitance C3 and metal-oxide-semiconductor Q1, and metal-oxide-semiconductor Q1 comprises grid g, drain electrode d and source electrode s.
One end of the 3rd resistance R 3 is connected with the output of the 3rd Schmidt trigger U3, and the other end is connected with the grid g of metal-oxide-semiconductor Q1, and the drain electrode d of metal-oxide-semiconductor Q1 is connected with the fixed contact of relay R Y, and the source electrode s of metal-oxide-semiconductor Q1 connects equipotential.
The anode of the first diode D1 is connected with the grid g of metal-oxide-semiconductor Q1, and negative electrode is connected with the source electrode s of metal-oxide-semiconductor Q1.The anode of the second diode D2 is connected with the drain electrode d of metal-oxide-semiconductor Q1, and negative electrode is connected with the source electrode s of metal-oxide-semiconductor Q1.The anode of the 3rd diode D3 is connected with the moving contact of relay R Y, and negative electrode is connected with the fixed contact of relay R Y.
One end of high-voltage capacitance C3 is connected with the moving contact of relay R Y, and the other end is connected with the fixed contact of relay R Y.The 5th diode D5 one end is connected with the moving contact of relay R Y, and the other end is connected with the fixed contact of relay R Y.The anode of the 4th diode D4 is connected with the moving contact of relay R Y, and negative electrode is connected with external power supply by current-limiting resistance R4.
In the utility model embodiment, metal-oxide-semiconductor Q1 selects N-channel MOS pipe.It is the Schmidt trigger of CD40106 that the first Schmidt trigger U1, the second Schmidt trigger U2, the 3rd Schmidt trigger U3 all select model.The first diode D1, the second diode D2 all select unidirectional Transient Suppression Diode, and the 3rd diode D3 selects and holds stream diode, and the 4th diode D4 selects germanium diode, and the 5th diode D5 selects two-way Transient Suppression Diode.
In the utility model embodiment, the job step of direct current relay drive circuit is as follows:
S1: control signal Ctr, through the first Schmidt trigger U1, the first schmidt trigger U2, after the first resistance R 1 and the first filter capacitor C1, obtains signal V1.
S2: signal V1 is loaded on the anode of Light-Emitting Diode D6, the Light-Emitting Diode D6 utmost point judges whether signal V1 is low level signal, if so, Light-Emitting Diode D6 communication cut-off; Otherwise Light-Emitting Diode D6 transmits to the base stage of light emitting transistor Q2, photoelectrical coupler conducting, proceeds to step S3.
S3: signal V1, by the effect of photoelectrical coupler, obtains signal V2, signal V2, after the second filter capacitor C2 and the 3rd schmidt trigger U3, obtains signal V3.
S3: signal V3 is connected with the grid g of metal-oxide-semiconductor Q1 by the 3rd resistance R 3.Metal-oxide-semiconductor Q1, current-limiting resistance R4, the 4th diode D4 and relay R Y coil form closed-loop path.
Metal-oxide-semiconductor Q1 judges whether signal V3 is low level, the if so, output of metal-oxide-semiconductor Q1 drain electrode d no current, and relay R Y coil no current passes through, and relay R Y disconnects; Otherwise, proceed to step S4.
The grid g of S4:MOS pipe Q1 and drain electrode d connect, and have electric current to pass through, relay R Y closure in the loop that drain electrode d, current-limiting resistance R4, the 4th diode D4 and relay R Y coil form.
In the utility model embodiment, the operation principle of direct current relay drive circuit is as follows:
In the utility model embodiment, the first diode D1, the second diode D2 are unidirectional Transient Suppression Diode, and in the time that the power frequency in circuit, size variation are very fast, the first diode D1 can protect metal-oxide-semiconductor Q1 effectively.
The 3rd diode D3 is for holding stream diode, and after relay R Y disconnects, the 3rd diode D3 can discharge the electric energy storing in relay R Y coil timely fast.
High-voltage capacitance C3 can avoid relay R Y coil disturbed.
D5 is two-way Transient Suppression Diode, suppresses relay R Y coil both end voltage.D4 is germanium diode, produces and disturbs, and in the situation of corresponding protection inefficacy, avoid its driving power to exert an influence at relay R Y coil two ends.
By regulating current-limiting resistance R4 resistance value, can the coil of control relay RY in size of current, avoid the excessive coil that causes relay R Y of coil current to be burnt.
The utility model is not only confined to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present utility model; no matter but do any variation in its shape or structure; every have identical with a utility model or akin technical scheme, all within its protection range.
Claims (10)
1. a direct current relay drive circuit, comprises relay drive unit, it is characterized in that: also comprise signal isolated location, the output of signal isolated location is connected with the input of relay drive unit;
Described signal isolated location comprises the first Schmidt trigger U1, the second Schmidt trigger U2, the 3rd Schmidt trigger U3, photoelectrical coupler, the first resistance R 1 and the second resistance R 2; Described photoelectrical coupler comprises Light-Emitting Diode D6 and luminous triode Q2;
The input of described the first Schmidt trigger U1 is connected with external control signal, output is connected with the input of the second Schmidt trigger U2, the output of the second Schmidt trigger U2 is the anodic bonding with Light-Emitting Diode D6 by the first resistance R 1, the minus earth of Light-Emitting Diode D6;
The base stage coupling of the negative electrode of Light-Emitting Diode D6 and luminous triode Q2, the collector electrode of light emitting transistor Q2 is connected with external power supply by the second resistance R 2, the collector electrode of light emitting transistor Q2 is connected with the input of the 3rd Schmidt trigger U3, and the emitter of light emitting transistor Q2 connects equipotential;
Described electrical equipment driver element comprises relay R Y, the 3rd resistance R 3, current-limiting resistance R4, the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4 and metal-oxide-semiconductor Q1, and the first diode D1 selects unidirectional transient diode; Relay R Y is provided with fixed contact and moving contact, and metal-oxide-semiconductor Q1 is provided with grid g, drain electrode d and source electrode s;
The output of the 3rd Schmidt trigger U3 is connected with the grid g of metal-oxide-semiconductor Q1 by the 3rd resistance R 3, and the drain electrode d of metal-oxide-semiconductor Q1 is connected with the fixed contact of relay R Y, and the source electrode s of metal-oxide-semiconductor Q1 connects equipotential;
The anode of described the first diode D1 is connected with the grid g of metal-oxide-semiconductor Q1, and negative electrode is connected with the source electrode s of metal-oxide-semiconductor Q1; The anode of described the second diode D2 is connected with the drain electrode d of metal-oxide-semiconductor Q1, and negative electrode is connected with the source electrode s of metal-oxide-semiconductor Q1; The anode of described the 3rd diode D3 is connected with the moving contact of relay R Y, and negative electrode is connected with the fixed contact of relay R Y; The anode of described the 4th diode D4 is connected with the moving contact of relay R Y, and negative electrode is connected with external power supply by current-limiting resistance R4.
2. direct current relay drive circuit as claimed in claim 1, is characterized in that: described signal isolated location also comprises the first filter capacitor C1, and the first filter capacitor C1 is in parallel with Light-Emitting Diode D6.
3. direct current relay drive circuit as claimed in claim 1, it is characterized in that: described signal isolated location also comprises the second filter capacitor C2, one end of the second filter capacitor C2 is connected with the collector electrode of light emitting transistor Q2, the other end is connected with the emitter of light emitting transistor Q2, and the other end of the second filter capacitor C2 connects equipotential simultaneously.
4. direct current relay drive circuit as claimed in claim 1, is characterized in that: described signal isolated location also comprises high-voltage capacitance C3, and high-voltage capacitance C3 is in parallel with the 3rd diode D3.
5. direct current relay drive circuit as claimed in claim 1, is characterized in that: described signal isolated location also comprises the 5th diode D5, and the 5th diode D5 is in parallel with the 3rd diode D3.
6. direct current relay drive circuit as claimed in claim 5, is characterized in that: described the 5th diode D5 selects two-way Transient Suppression Diode.
7. direct current relay drive circuit as claimed in claim 1, is characterized in that: it is the Schmidt trigger of CD40106 that described the first Schmidt trigger U1, the second Schmidt trigger U2, the 3rd Schmidt trigger U3 all select model.
8. direct current relay drive circuit as claimed in claim 1, is characterized in that: described the second diode D2 selects unidirectional Transient Suppression Diode.
9. direct current relay drive circuit as claimed in claim 1, is characterized in that: described the 3rd diode D3 selects and holds stream diode, and the 4th diode D4 selects germanium diode.
10. direct current relay drive circuit as claimed in claim 1, is characterized in that: described metal-oxide-semiconductor Q1 selects N-channel MOS pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420276815.8U CN203966976U (en) | 2014-05-28 | 2014-05-28 | A kind of direct current relay drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420276815.8U CN203966976U (en) | 2014-05-28 | 2014-05-28 | A kind of direct current relay drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203966976U true CN203966976U (en) | 2014-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420276815.8U Expired - Lifetime CN203966976U (en) | 2014-05-28 | 2014-05-28 | A kind of direct current relay drive circuit |
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| Country | Link |
|---|---|
| CN (1) | CN203966976U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765419A (en) * | 2019-03-05 | 2019-05-17 | 连云港市计量检定测试中心 | A kind of miniature non-transformer scanner based on VMC |
| CN112504328A (en) * | 2020-12-15 | 2021-03-16 | 中建八局第二建设有限公司 | Wireless monitoring system for operation safety belt |
| CN114420505A (en) * | 2022-01-25 | 2022-04-29 | 西安微电子技术研究所 | Circuit for solving small current failure of magnetic latching relay |
-
2014
- 2014-05-28 CN CN201420276815.8U patent/CN203966976U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765419A (en) * | 2019-03-05 | 2019-05-17 | 连云港市计量检定测试中心 | A kind of miniature non-transformer scanner based on VMC |
| CN109765419B (en) * | 2019-03-05 | 2024-05-03 | 连云港市计量检定测试中心 | Miniature powerless scanner based on VMC |
| CN112504328A (en) * | 2020-12-15 | 2021-03-16 | 中建八局第二建设有限公司 | Wireless monitoring system for operation safety belt |
| CN114420505A (en) * | 2022-01-25 | 2022-04-29 | 西安微电子技术研究所 | Circuit for solving small current failure of magnetic latching relay |
| CN114420505B (en) * | 2022-01-25 | 2023-05-30 | 西安微电子技术研究所 | Circuit for solving small current failure of magnetic latching relay |
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| GR01 | Patent grant | ||
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Granted publication date: 20141126 |