CN206790072U - A kind of short-circuit protection and indicator function circuit - Google Patents
A kind of short-circuit protection and indicator function circuit Download PDFInfo
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- CN206790072U CN206790072U CN201720457215.5U CN201720457215U CN206790072U CN 206790072 U CN206790072 U CN 206790072U CN 201720457215 U CN201720457215 U CN 201720457215U CN 206790072 U CN206790072 U CN 206790072U
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Abstract
The utility model discloses a kind of short-circuit protection and indicator function circuit; including power input and load output terminal; short-circuit protection and indicating circuit are provided between the power input and load output terminal, the short-circuit protection and indicating circuit include the first triode, the second triode, the 3rd triode, first resistor, indication LED lamp, the first electric capacity, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, unilateral diode.Structure setting of the present utility model is reasonable; it is when in use; when the voltage of load output terminal is close to 0; short-circuit protection is carried out by short-circuit protection and indicating circuit and indicated simultaneously; so as to the purpose for reaching protection with reminding; it is not only advantageous to improve the stability in use and use reliability of load, is advantageous to improve the service life of the power supply of the load of circuit, applicability is good and practical.
Description
Technical field
The utility model belongs to electronic circuit technology field, and in particular to a kind of short-circuit protection and indicator function circuit.
Background technology
With the maturation of China's electronic technology, various electronic equipments are quickly grown, and all can during electronic equipment use
There is the situation of two terminal shortcircuits of load, it is not only easily damaged load and power supply, potential safety hazard be present, and to a certain degree
On can also influence its stability in use and use reliability, so applicability and practicality are restricted.
The content of the invention
The purpose of this utility model is to provide the short-circuit protection and instruction that a kind of structure setting is reasonable and stability in use is good
Functional circuit.
The technical scheme for realizing the utility model purpose is a kind of short-circuit protection and indicator function circuit, including power input
End and load output terminal, are provided with short-circuit protection and indicating circuit, institute between the power input and load output terminal
State short-circuit protection and indicating circuit include the first triode, the second triode, the 3rd triode, first resistor, indication LED lamp,
First electric capacity, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, unilateral diode, the two or three pole
The colelctor electrode of pipe is connected with the positive pole of power input, emitter stage is connected with the positive pole of load output terminal, base stage and the
The colelctor electrode of three triodes is connected, and the emitter stage of the 3rd triode is connected with the emitter stage of the second triode and base stage
By 3rd resistor, the first electric capacity series circuit after be grounded, the 5th resistance be connected to the colelctor electrode of the second triode with
Between base stage, after the second resistance is connected with unilateral diode and the other end of second resistance is being connected to power input just
Extremely upper and unilateral diode negative pole ground connection, the 4th resistance with after the 6th resistant series and the other end of the 4th resistance is connected
On the emitter stage of the second triode, the other end ground connection of the 6th resistance, the base stage of first triode is connected to the 4th electricity
Resistance and the colelctor electrode of the junction of the 6th resistance and the first triode by first resistor be connected to power input positive pole and
Grounded emitter, the positive pole of the indication LED lamp is connected on the colelctor electrode of the first triode, negative pole ground connection.
First triode, the second triode and the 3rd triode are NPN type triode.
First electric capacity is 100 μ F/16V electrochemical capacitor.
The utility model has positive effect：Structure setting of the present utility model is reasonable, and it is defeated when loading when in use
When going out the voltage of terminal close to 0, short-circuit protection is carried out by short-circuit protection and indicating circuit and indicated simultaneously, so as to reach
Protection and the purpose reminded, it is not only advantageous to improve the stability in use and use reliability of load, is advantageous to improve circuit
The service life of the power supply of load, applicability are good and practical.
Brief description of the drawings
In order that content of the present utility model is more likely to be clearly understood, below according to specific embodiment and combine attached
Figure, is described in further detail to the utility model, wherein：
Fig. 1 is particular circuit configurations schematic diagram of the present utility model.
Embodiment
(embodiment 1)
Fig. 1 shows a kind of embodiment of the present utility model, and wherein Fig. 1 is physical circuit knot of the present utility model
Structure schematic diagram.
Fig. 1, a kind of short-circuit protection and indicator function circuit, including power input 1 and load output terminal 2 are seen, in institute
State and short-circuit protection and indicating circuit 3, the short-circuit protection and indicating circuit 3 are provided between power input and load output terminal
Including the first triode Q1, the second triode Q2, the 3rd triode Q3, first resistor R1, indication LED lamp LED1, the first electric capacity
C1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, unilateral diode D, described
Two triode Q2 colelctor electrode is connected with the positive pole of power input 1, emitter stage is connected with the positive pole of load output terminal 2
Connect, base stage is connected with the 3rd triode Q3 colelctor electrode, the emitter stage of the 3rd triode Q3 and the second triode Q2's
Emitter stage be connected and base stage by 3rd resistor R3, the first electric capacity C1 series circuit after be grounded, the 5th resistance R5 connects
It is connected between the second triode Q2 colelctor electrode and base stage, after the second resistance R2 connects with unilateral diode D and second is electric
The resistance R2 other end is connected on the positive pole of power input 1 and unilateral diode D negative pole ground connection, the 4th resistance R4
After being connected with the 6th resistance R6 and the 4th resistance R4 the other end be connected on the second triode Q2 emitter stage, the 6th resistance R6
Other end ground connection, the base stage of the first triode Q1 is connected to the 4th resistance R4 and the 6th resistance R6 junction and first
Triode Q1 colelctor electrode is connected to positive pole and the grounded emitter of power input 1, the indication LED by first resistor R1
Lamp LED1 positive pole is connected on the first triode Q1 colelctor electrode, negative pole ground connection.
First triode, the second triode and the 3rd triode are NPN type triode.
First electric capacity is 100 μ F/16V electrochemical capacitor.
Its operation principle is summarized as follows：Power input is Usr, load outputs Usc；When normal power supply, three poles
Pipe Q2 is in saturation conduction state, U+ voltages close to V+ voltage, now load outputs partial pressure is carried out by resistance R4 and R6,
Turn on Q1, indicator lamp LED extinguishes.When short-circuit conditions occur in load outputs, voltage is close to 0, i.e. triode Q3 at U+
Voltage is now high level at electric capacity C1 positive poles, Q3 base stages have forward voltage drop and turned on, Q2 base stages and hair close to 0 at emitter stage
Emitter-base bandgap grading is because Q3 conducting loses enough forward voltage drops, therefore Q2 ends, and output end is left faint electric current, reaches protection power source
Purpose.At the same time, there is no enough bias voltages because output end voltage is close to 0, Q1 and enter cut-off state, indicate
Lamp LED1 is lighted, and abnormality occurs in cue circuit output end.
Structure setting of the present utility model is reasonable, and it when the voltage of load output terminal is close to 0, passes through when in use
Short-circuit protection and indicating circuit carry out short-circuit protection and indicated simultaneously, so as to the purpose for reaching protection with reminding, not only have
Beneficial to the stability in use loaded and use reliability is improved, be advantageous to improve the use longevity of the power supply of the load of circuit
Life, applicability are good and practical.
Obviously, above-described embodiment of the present utility model is only intended to clearly illustrate the utility model example, and
It is not the restriction to embodiment of the present utility model.For those of ordinary skill in the field, in described above
On the basis of can also make other changes in different forms.There is no need and unable to give all embodiments
It is exhaustive.And these belong to the obvious changes or variations that connotation of the present utility model is extended out and still fall within this practicality
New protection domain.
Claims (3)
1. a kind of short-circuit protection and indicator function circuit, including power input and load output terminal, in the power input
Short-circuit protection and indicating circuit are provided between end and load output terminal, its feature exists：Short-circuit protection and the indicating circuit bag
Include the first triode, the second triode, the 3rd triode, first resistor, indication LED lamp, the first electric capacity, second resistance, the 3rd
Resistance, the 4th resistance, the 5th resistance, the 6th resistance, unilateral diode, the colelctor electrode and power input of second triode
Positive pole be connected, emitter stage is connected with the positive pole of load output terminal, base stage is connected with the colelctor electrode of the 3rd triode,
The emitter stage of 3rd triode is connected with the emitter stage of the second triode and base stage passes through 3rd resistor, the first electric capacity
Be grounded after series circuit, the 5th resistance is connected between colelctor electrode and the base stage of the second triode, the second resistance with
After unilateral diode series connection and the other end of second resistance is connected on the positive pole of power input and the negative pole of unilateral diode
Ground connection, after the 4th resistance and the 6th resistant series and the other end of the 4th resistance is connected to the emitter stage of the second triode
Upper, the 6th resistance other end ground connection, the base stage of first triode are connected to the junction of the 4th resistance and the 6th resistance
And first the colelctor electrode of triode positive pole and the grounded emitter of power input, the instruction are connected to by first resistor
The positive pole of LED is connected on the colelctor electrode of the first triode, negative pole ground connection.
2. short-circuit protection according to claim 1 and indicator function circuit, it is characterised in that：First triode,
Two triodes and the 3rd triode are NPN type triode.
3. short-circuit protection according to claim 2 and indicator function circuit, it is characterised in that：First electric capacity is 100 μ
F/16V electrochemical capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720457215.5U CN206790072U (en) | 2017-04-27 | 2017-04-27 | A kind of short-circuit protection and indicator function circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720457215.5U CN206790072U (en) | 2017-04-27 | 2017-04-27 | A kind of short-circuit protection and indicator function circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206790072U true CN206790072U (en) | 2017-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720457215.5U Active CN206790072U (en) | 2017-04-27 | 2017-04-27 | A kind of short-circuit protection and indicator function circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109302776A (en) * | 2018-12-06 | 2019-02-01 | 上汽大众汽车有限公司 | A kind of lighting circuit of vehicle switch function instruction |
-
2017
- 2017-04-27 CN CN201720457215.5U patent/CN206790072U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109302776A (en) * | 2018-12-06 | 2019-02-01 | 上汽大众汽车有限公司 | A kind of lighting circuit of vehicle switch function instruction |
| CN109302776B (en) * | 2018-12-06 | 2024-02-02 | 上汽大众汽车有限公司 | Lighting circuit for indicating automobile switch function |
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