CN206685892U - A kind of sample resistance protection circuit - Google Patents
A kind of sample resistance protection circuit Download PDFInfo
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- CN206685892U CN206685892U CN201720493109.2U CN201720493109U CN206685892U CN 206685892 U CN206685892 U CN 206685892U CN 201720493109 U CN201720493109 U CN 201720493109U CN 206685892 U CN206685892 U CN 206685892U
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Abstract
A kind of sample resistance protection circuit is the utility model is related to, it is made up of sample resistance R1 ~ R7, diode D1 ~ D2, load L, triode Q1 ~ Q2 connections.The utility model structure design is simple, reasonable, safe and reliable, can effectively avoid sample resistance excessively stream from damaging, simple in circuits, cost is low, and protecting effect is notable.
Description
Technical field
It the utility model is related to a kind of circuit protection technical field, and in particular to a kind of sample resistance protection circuit.
Background technology
It is problem that various sampling modes can run into that sample resistance burns because of excessively stream.For this, people devise various protections
Method, or but complex circuit, reliability it is low；Cost increase is more.As shown in Fig. 2 original sample resistance protection electricity
Road is made up of resistance R1 ~ R7, diode D2, load L, triode Q1 ~ Q2 connections, and resistance R1 is sample resistance, this circuit
Sample resistance R1 would generally burn because of load increase or short circuit overcurrent, bring very big potential safety hazard, be to use resistance
It is sampled the problem that can run into.
The content of the invention
In view of the above-mentioned problems, it is simple, reasonable the utility model proposes a kind of structure design, it is safe and reliable, can have
Effect avoids sample resistance excessively stream from damaging, and simple in circuits, cost is low, the significant sample resistance protection circuit of protecting effect.
The technical solution of the utility model is as follows：
Above-mentioned sample resistance protection circuit, by sample resistance R1 ~ R7, diode D1 ~ D2, load L, triode Q1 ~ Q2
Connection composition；Described sample resistance R1 one end connects 30V power supplys, and the other end connects described load L one end；The load L is another
End ground connection, the diode D1 is sampling protection diode and is parallel to the sample resistance R1 both ends；The diode D1's
Anode tap is connected to 30V power supplys, and cathode terminal is connected to the sample resistance R1 and loads the tie point between L；The diode
D2 anode tap is connected to the cathode terminal of the diode D1, and the cathode terminal of the diode D2 is connected to the triode Q1's
Base stage；Described resistance R2 one end connects 30V power supplys, and the other end connects the emitter stage of the triode Q1；Described resistance R4 one end
Ground connection, the other end connect the base stage of the triode Q1；Described resistance R6 one end connects the colelctor electrode of the triode Q1, another
End connects the base stage of the triode Q2；Resistance R7 one end ground connection, the other end connect the base stage of the triode Q2；It is described
Resistance R5 one end connects the colelctor electrode of the triode Q2, other end connection 30V power supplys；The emitter stage of the triode Q2 connects
Ground；Described resistance R3 one end is connected to the colelctor electrode of the triode Q2, and the other end is signal output part and is connected to control output
Or A/D change-over circuits.
The sample resistance protection circuit, wherein：The triode Q1 is PNP type triode, and the triode Q2 is NPN
Type triode.
Beneficial effect：
The utility model sample resistance protection circuit structure design is simple, reasonable, safe and reliable, in sample resistance two
To hold and access sample protection diode, can effectively avoid sample resistance R1 from being burnt because of excessively stream, whole simple in circuits, cost is low,
Protecting effect is notable.
Brief description of the drawings
Fig. 1 is the circuit diagram of the utility model sample resistance protection circuit；
Fig. 2 is the circuit diagram of former sample resistance protection circuit.
Embodiment
As shown in figure 1, the utility model sample resistance protection circuit, by sample resistance R1 ~ R7, diode D1 ~ D2, load
L, triode Q1 ~ Q2 connections form.
Sample resistance R1 one end connects 30V power supplys, other end connection load L one end；The load L other ends are grounded, should
Diode D1 is sampling protection diode and is parallel to sample resistance R1 both ends, and diode D1 anode tap is connected to 30V
Power supply, diode D1 cathode terminal are connected to sample resistance R1 and load the tie point between L；Diode D2 anode tap
Diode D1 cathode terminal is connected to, diode D2 cathode terminal is connected to triode Q1 base stage；Resistance R2 one end connects
Connect 30V power supplys, other end connecting triode Q1 emitter stage；Resistance R4 one end is grounded, other end connecting triode Q1 base
Pole；Resistance R6 one end connecting triode Q1 colelctor electrode, other end connecting triode Q2 base stage；Resistance R7 mono- is terminated
Ground, other end connecting triode Q2 base stage；Resistance R5 one end connecting triode Q2 colelctor electrode, other end connection 30V electricity
Source；Triode Q2 grounded emitter；Resistance R3 one end is connected to triode Q2 colelctor electrode, and the other end is signal output
Hold and be connected to control output or A/D change-over circuits.Triode Q1 is PNP type triode, and triode Q2 is the pole of NPN type three
Pipe.
The principle of the utility model sample resistance protection circuit：
Using diode D1 forward conduction characteristic, when electric current is smaller in sample resistance, diode D1 is not turned on, to taking
Sample resistance protection circuit is without influence.After electric current exceedes certain value, diode D1 is turned on to current distributing, and to sample resistance R1
Both end voltage is limited, so as to realize the protection to sample resistance R1.
The utility model structure design is simple, reasonable, at sample resistance both ends and connects protection diode, can effectively avoid taking
Sample resistance R1 burns because of excessively stream, and simple in circuits, cost is low, and protecting effect is notable.
Claims (2)
1. a kind of sample resistance protection circuit, it is characterised in that by sample resistance R1 ~ R7, diode D1 ~ D2, load L, three poles
Pipe Q1 ~ Q2 connections form；Described sample resistance R1 one end connects 30V power supplys, and the other end connects described load L one end；It is described negative
L other ends ground connection is carried, the diode D1 is sampling protection diode and is parallel to the sample resistance R1 both ends；Two pole
Pipe D1 anode tap is connected to 30V power supplys, and cathode terminal is connected to the sample resistance R1 and loads the tie point between L；It is described
Diode D2 anode tap is connected to the cathode terminal of the diode D1, and the cathode terminal of the diode D2 is connected to three pole
Pipe Q1 base stage；Described resistance R2 one end connects 30V power supplys, and the other end connects the emitter stage of the triode Q1；The resistance
R4 one end is grounded, and the other end connects the base stage of the triode Q1；Described resistance R6 one end connects the current collection of the triode Q1
Pole, the other end connect the base stage of the triode Q2；Resistance R7 one end ground connection, the other end connect the base of the triode Q2
Pole；Described resistance R5 one end connects the colelctor electrode of the triode Q2, other end connection 30V power supplys；The hair of the triode Q2
Emitter grounding；Described resistance R3 one end is connected to the colelctor electrode of the triode Q2, and the other end is signal output part and is connected to control
System output or A/D change-over circuits.
2. sample resistance protection circuit as claimed in claim 1, it is characterised in that：The triode Q1 is PNP type triode,
The triode Q2 is NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720493109.2U CN206685892U (en) | 2017-05-05 | 2017-05-05 | A kind of sample resistance protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720493109.2U CN206685892U (en) | 2017-05-05 | 2017-05-05 | A kind of sample resistance protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206685892U true CN206685892U (en) | 2017-11-28 |
Family
ID=60405905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720493109.2U Active CN206685892U (en) | 2017-05-05 | 2017-05-05 | A kind of sample resistance protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206685892U (en) |
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2017
- 2017-05-05 CN CN201720493109.2U patent/CN206685892U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191231 Address after: 442013 No.1, Science Park Road, Shiyan economic and Technological Development Zone, Hubei Province Patentee after: Shiyan Tian Yun Automobile Electric Appliance Co., Ltd. Address before: 442013 No. 1, science and technology road, Shiyan Economic Development Zone, Hubei, China Patentee before: Hubei Tianyun Automotive Electric Systems Co., Ltd. |
|
| TR01 | Transfer of patent right |