CN206293877U - A kind of overvoltage crowbar - Google Patents
A kind of overvoltage crowbar Download PDFInfo
- Publication number
- CN206293877U CN206293877U CN201621386118.3U CN201621386118U CN206293877U CN 206293877 U CN206293877 U CN 206293877U CN 201621386118 U CN201621386118 U CN 201621386118U CN 206293877 U CN206293877 U CN 206293877U
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- China
- Prior art keywords
- fuse
- switch pipe
- voltage
- resistance
- overvoltage crowbar
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Abstract
The utility model is related to a kind of overvoltage crowbar, and it includes first fuse, first switch pipe, the first voltage-regulator diode, first resistor；First fuse connects input power, and the other end connects first switch pipe one end, the first voltage-regulator diode negative electrode, electrical equipment respectively；First voltage-regulator diode anode connects first resistor one end, the controllable end of first switch pipe respectively；The first resistor other end and the first switch pipe other end are grounded.The utility model constitutes a kind of easy overvoltage crowbar using devices such as fuse, resistance, switching tube, voltage-regulator diodes, with low cost, can prevent late-class circuit from being damaged because input voltage is too high；Increase the branch road that voltage-regulator diode or resistance with antihypertensive effect are connected with fuse, increase input voltage range；Increase warning circuit, when input voltage is too high cause fuse blows after alerted, intuitively react circuit conditions, so as to operating personnel accurately and timely be adjusted maintenance.
Description
Technical field
The utility model belongs to electronic technology field, is specifically related to a kind of overvoltage crowbar.
Background technology
For many electrical equipments, electrical equipment may be damaged when input voltage is too high, or even endanger personal safety, and this
Plant the too high possibility of input voltage to exist all the time again, the situation too high to input voltage is alerted, the electricity of cut-out input in time
Source is even more important.
The content of the invention
The purpose of this utility model is to provide a kind of overvoltage crowbar.
To achieve the above object, the utility model is realized using following technical scheme：A kind of overvoltage crowbar, is connected to
Between input power and load, it is characterised in that：Including first fuse, first switch pipe, the first voltage-regulator diode, the first electricity
Resistance；The first fuse connects input power, and the other end connects first switch pipe one end, the first voltage-regulator diode negative electrode, bears respectively
Carry；First voltage-regulator diode anode connects first resistor one end, the controllable end of first switch pipe respectively；The first resistor other end and first
The switching tube other end is grounded.
Further, also including second resistance and the first electric capacity；The second resistance be connected on the first fuse other end with
Between first switch pipe one end；First electric capacity is in parallel with first resistor.
Further, also including including voltage drop element and second fuse；The voltage drop element one terminates first fuse one
End, another termination second fuse one end of voltage drop element；Another termination first fuse other end of second fuse.
In the embodiment of the utility model one, the voltage drop element is the second voltage-regulator diode, described voltage drop element one end
It is the second voltage-regulator diode negative electrode, the voltage drop element other end is the second voltage-regulator diode anode.
In the embodiment of the utility model one, the voltage drop element is a resistance.
Further, also including over-pressed alarm module；The described termination first fuse of over-pressed alarm module one one end；It is described
Over-pressed another termination first fuse other end of alarm module.
In the embodiment of the utility model one, the over-pressed alarm module includes the 3rd to the 5th resistance, second switch pipe
And light emitting diode；Described 3rd resistor one end connects first fuse one end, second switch pipe one end respectively, and 3rd resistor is another
End connects the controllable end of second switch, the 4th resistance one end respectively；Another termination first fuse other end of 4th resistance；Second switch
Pipe other end sending and receiving optical diode anode；Light-emitting diodes tube cathode connects the 5th resistance one end；The 5th resistance other end is grounded.
In the embodiment of the utility model one, the over-pressed alarm module also includes the second electric capacity；Second electric capacity with
3rd resistor is in parallel.
In the embodiment of the utility model one, the second switch pipe is triode, and the wherein controllable end of second switch pipe is
The transistor base, second switch pipe one end is the transistor emitter, and the second switch pipe other end is the transistor collector.
In the embodiment of the utility model one, the first switch pipe is FET, the wherein controllable end of first switch pipe
It is the fet gate, first switch pipe one end drains for the FET, the first switch pipe other end is the FET
Source electrode.
Compared with prior art, the utility model has advantages below：
A kind of easy overvoltage crowbar, knot are constituted using devices such as fuse, resistance, switching tube, voltage-regulator diodes
Structure is simple, with low cost, can prevent late-class circuit from being damaged because input voltage is too high；
Increase the branch road that voltage-regulator diode or resistance with antihypertensive effect are connected with fuse, control source can be increased
Scope, so that late-class circuit can normal work in voltage range wider；
Increase warning circuit, when input voltage is too high cause fuse blows after alerted, intuitively react circuit feelings
Condition, so as to operating personnel accurately and timely be adjusted maintenance.
Brief description of the drawings
Fig. 1 is the circuit diagram of the specific embodiment of the utility model one.
Specific embodiment
Explanation is further explained to the utility model with specific embodiment below in conjunction with the accompanying drawings.
A kind of overvoltage crowbar, including one-level overvoltage protective module, the one-level overvoltage protective module include that first melts
Disconnected device, first switch pipe, the first voltage-regulator diode, first resistor；The first fuse connects input power, and the other end connects respectively
First switch pipe one end, the first voltage-regulator diode negative electrode, electrical equipment；First voltage-regulator diode anode connects first resistor one respectively
End, the controllable end of first switch pipe；The first resistor other end and the first switch pipe other end are grounded.
Further, the one-level overvoltage protective module also includes second resistance and the first electric capacity；The second resistance connects
Between the first fuse other end and first switch pipe one end；First electric capacity is in parallel with first resistor.Second resistance is used
In current limliting, the first electric capacity is used to filter.
Further, also including two grades of overvoltage protective modules；Two grades of overvoltage protective modules include voltage drop element and the
Two fuses；The termination first fuse of the voltage drop element one one end, another termination second fuse one end of voltage drop element；Second
Another termination first fuse other end of fuse.
In the embodiment of the utility model one, the voltage drop element is the second voltage-regulator diode, described voltage drop element one end
It is the second voltage-regulator diode negative electrode, the voltage drop element other end is the second voltage-regulator diode anode.
In the embodiment of the utility model one, the voltage drop element is a resistance.
Further, also including over-pressed alarm module；The described termination first fuse of over-pressed alarm module one one end；It is described
Over-pressed another termination first fuse other end of alarm module.
In the embodiment of the utility model one, the over-pressed alarm module includes the 3rd to the 5th resistance, second switch pipe
And Alarm Unit；Described 3rd resistor one end connects first fuse one end, second switch pipe one end, the 3rd resistor other end respectively
The controllable end of second switch, the 4th resistance one end are connect respectively；Another termination first fuse other end of 4th resistance；Second switch pipe
Another termination Alarm Unit one end；The 5th resistance one end of another termination of Alarm Unit；The 5th resistance other end is grounded.In Fig. 1
Alarm Unit is a light emitting diode, and other sound, light Alarm Unit can also be used in other embodiment.
In the embodiment of the utility model one, the over-pressed alarm module also includes the second electric capacity；Second electric capacity with
3rd resistor is in parallel.Second electric capacity is used to filter.
In the embodiment of the utility model one, the second switch pipe is triode, and the wherein controllable end of second switch pipe is
The transistor base, second switch pipe one end is the transistor emitter, and the second switch pipe other end is the transistor collector.
In the embodiment of the utility model one, the first switch pipe is FET, the wherein controllable end of first switch pipe
It is the fet gate, first switch pipe one end drains for the FET, the first switch pipe other end is the FET
Source electrode.
The circuit theory diagrams of the utility model specific embodiment are referring to Fig. 1.1 is one-level overvoltage protective module in figure, and 2 is two
Level overvoltage protective module, 3 is over-pressed alarm module.
Operation principle of the present utility model is briefly illustrated by taking the physical circuit schematic diagram in Fig. 1 as an example：
1. as VCC ＜ V1=VD1+VQ1on, VCC1=VCC, VCC1 without departing from successive load operating voltage, now Q1,
Q2 ends, and light emitting diode D3 does not light；Wherein VD1 is the voltage stabilizing value of voltage-regulator diode D1, and VQ1on is the conducting of switching tube Q1
Voltage；
2. as V1≤VCC ＜ V1+ VD2, Q1 conductings, VCC selects appropriate fuse F1 through F1, R1, Q1 to GND,
The electric current of fuse F1 is flowed through in the range of current voltage makes F1 fuse, and due to fuse F1 fusing, D2 conductings, VCC is by D2, F2
To VCC1, now VCC1=VCC-VD2, D2 plays antihypertensive effect, the still operating voltage without departing from VCC1 without departing from successive load, real
Existing one-level overvoltage protection；The voltage at F1 two ends is the voltage stabilizing value VD2 of voltage-regulator diode D2 simultaneously, and there is partial pressure to act on for R3, R4 makes
Q2 is turned on, and light emitting diode D3 conductings are luminous, play fuse blows alarm function；
3. as VCC >=V1+VD2, Q1 conductings, VCC selects appropriate fuse F2 through D2, F2, R1, Q1 to GND, when
The electric current of fuse F2 is flowed through in preceding voltage range makes F2 fuse, and disconnects input, realizes two grades of overvoltage protections, similarly light-emitting diodes
Pipe D3 conductings are luminous, play fuse blows alarm function.
The foregoing is only preferred embodiment of the present utility model, it is all according to present utility model application the scope of the claims done it is equal
Deng change and modification, should all belong to covering scope of the present utility model.
Claims (10)
1. a kind of overvoltage crowbar, is connected between input power and load, it is characterised in that：Including first fuse,
One switching tube, the first voltage-regulator diode, first resistor；The first fuse one terminates input power, and first fuse is another
End connects first switch pipe one end, the first voltage-regulator diode negative electrode, load respectively；First voltage-regulator diode anode connects the first electricity respectively
Resistance one end, the controllable end of first switch pipe；The first resistor other end and the first switch pipe other end are grounded.
2. overvoltage crowbar according to claim 1, it is characterised in that：Also include second resistance and the first electric capacity；Institute
Second resistance is stated to be connected between the first fuse other end and first switch pipe one end；First electric capacity is with first resistor simultaneously
Connection.
3. overvoltage crowbar according to claim 1 and 2, it is characterised in that：Also include voltage drop element and the second fusing
Device；The termination first fuse of the voltage drop element one one end, another termination second fuse one end of voltage drop element；Second fuse
Another termination first fuse other end.
4. overvoltage crowbar according to claim 3, it is characterised in that：The voltage drop element is the pole of the second voltage stabilizing two
Pipe, described voltage drop element one end is the second voltage-regulator diode negative electrode, and the voltage drop element other end is the second voltage-regulator diode sun
Pole.
5. overvoltage crowbar according to claim 3, it is characterised in that：The voltage drop element is a resistance.
6. the overvoltage crowbar according to claim 1 or 4, it is characterised in that：Also include over-pressed alarm module；The mistake
The pressure termination first fuse of alarm module one one end；Another termination first fuse other end of over-pressed alarm module.
7. overvoltage crowbar according to claim 6, it is characterised in that：The over-pressed alarm module includes the 3rd to the
Five resistance, second switch pipe and Alarm Unit；3rd resistor one end connects first fuse one end, second switch pipe one end respectively,
The 3rd resistor other end connects the controllable end of second switch, the 4th resistance one end respectively；Another termination first fuse of 4th resistance is another
One end；Another termination Alarm Unit one end of second switch pipe；The 5th resistance one end of another termination of Alarm Unit；5th resistance is another
End ground connection.
8. overvoltage crowbar according to claim 7, it is characterised in that：The over-pressed alarm module also includes the second electricity
Hold；Second electric capacity is in parallel with 3rd resistor.
9. overvoltage crowbar according to claim 7, it is characterised in that：The second switch pipe is triode, wherein
The controllable end of second switch pipe is the transistor base, and second switch pipe one end is the transistor emitter, and second switch pipe is another
Hold as the transistor collector.
10. overvoltage crowbar according to claim 1, it is characterised in that：The first switch pipe is FET, its
The middle controllable end of first switch pipe is the fet gate, and first switch pipe one end drains for the FET, first switch pipe
The other end is the FET source electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621386118.3U CN206293877U (en) | 2016-12-16 | 2016-12-16 | A kind of overvoltage crowbar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621386118.3U CN206293877U (en) | 2016-12-16 | 2016-12-16 | A kind of overvoltage crowbar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206293877U true CN206293877U (en) | 2017-06-30 |
Family
ID=59103797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621386118.3U Active CN206293877U (en) | 2016-12-16 | 2016-12-16 | A kind of overvoltage crowbar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206293877U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732873A (en) * | 2017-11-09 | 2018-02-23 | 厦门芯阳科技股份有限公司 | It is a kind of to prevent BLDC motors to be driven protection circuit and method that operating generates electricity |
| CN111854071A (en) * | 2020-06-09 | 2020-10-30 | 海信（山东）空调有限公司 | Switch input circuit and air conditioner |
-
2016
- 2016-12-16 CN CN201621386118.3U patent/CN206293877U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732873A (en) * | 2017-11-09 | 2018-02-23 | 厦门芯阳科技股份有限公司 | It is a kind of to prevent BLDC motors to be driven protection circuit and method that operating generates electricity |
| CN107732873B (en) * | 2017-11-09 | 2024-03-22 | 厦门芯阳科技股份有限公司 | Protection circuit and method for preventing BLDC motor from being driven to run to generate power |
| CN111854071A (en) * | 2020-06-09 | 2020-10-30 | 海信（山东）空调有限公司 | Switch input circuit and air conditioner |
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