CN209344773U - Surge protection circuit - Google Patents
Surge protection circuit Download PDFInfo
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- CN209344773U CN209344773U CN201920213318.6U CN201920213318U CN209344773U CN 209344773 U CN209344773 U CN 209344773U CN 201920213318 U CN201920213318 U CN 201920213318U CN 209344773 U CN209344773 U CN 209344773U
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- 230000001681 protective effect Effects 0.000 claims description 29
- 230000002457 bidirectional effect Effects 0.000 claims description 19
- 230000001052 transient effect Effects 0.000 claims description 9
- 230000001629 suppression Effects 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model relates to a surge protection circuit, when first input or second input appear being greater than preset threshold value surge, first judgement end or second judgement end switch on with logic output, make first switch end and second switch end switch on, surge protection module inserts restraines the surge between first input and second input. Based on this, through threshold value judgement module realization accurate surge protection, avoid damaging back stage circuit device or false triggering surge protection.
Description
Technical field
The utility model relates to electronic circuit technology fields, more particularly to a kind of surging protection circuit.
Background technique
Surge is exactly to occur moment exceeding the peak value of stationary value, including surge voltage and surge current.It is set in electronic circuit
In meter, to prevent influence of the surge to late-class circuit device, surge protective device can be accessed between two input terminal of circuit.Wherein,
When surge exceeds the specification value of surge protective device, surge protective device work inhibits surge.
However, the specification value of traditional surge protective device is fixed, if the surge protective device for selecting specification value excessive,
Then surge can damage late-class circuit device before surge protective device work；If the surge protective device for selecting specification value too small, just
Often input also can trigger surge protective device work, cause late-class circuit device that can not work.
To sum up, there are drawbacks described above for traditional surge protective device.
Utility model content
Based on this, it is necessary to for defect present in traditional surge protective device, provide a kind of surging protection circuit.
A kind of surging protection circuit, including threshold value judgment module, controlled switch module and carrying out surge protection module；
The first of threshold value judgment module judges that end judges that end is used for connecting first input end, the second of threshold value judgment module
In connecting the second input terminal, the logic output terminal of threshold value judgment module is used to connect the controlled end of controlled switch module；
The first switch end of controlled switch module, the second switch end of controlled switch module and carrying out surge protection module are serially connected in
Between first input end and the second input terminal；
When first input end output is greater than the surge of preset threshold, first judges that end is connected with logic output terminal, makes first
Switch terminals are connected with second switch end, inhibit surge between carrying out surge protection module access first input end and the second input terminal；
When the output of second input terminal is greater than the surge of preset threshold, second judges that end is connected with logic output terminal, makes first
Switch terminals are connected with second switch end, inhibit surge between carrying out surge protection module access first input end and the second input terminal.
Threshold value judgment module includes first diode and the second diode in one of the embodiments,；
The cathode of first diode judges end for first, and the cathode of the second diode judges end for second；
The just extremely logic output terminal of the anode of first diode and the second diode.
First diode and the second diode are Transient Suppression Diode in one of the embodiments,.
It in one of the embodiments, further include the first protective resistance and the second protective resistance；
One end of anode the first protective resistance of connection of first diode, the other end of the first protective resistance are logic output
End；
One end of anode the second protective resistance of connection of second diode, the other end of the second protective resistance are logic output
End.
It in one of the embodiments, further include adjustable resistance；
Logic output terminal is used to be grounded by adjustable resistance.
Threshold value judgment module includes first voltage comparator and second voltage comparator in one of the embodiments,；
The non-inverting input terminal of first voltage comparator is first judge end, and the non-inverting input terminal of second voltage comparator is the
Two judge end；
The inverting input terminal of first voltage comparator and the inverting input terminal of second voltage comparator are for connecting logic low
Level terminal；
The output end of first voltage comparator and the output end of second voltage comparator are logic output terminal.
Controlled switch module includes semiconductor switch or switch chip in one of the embodiments,.
Semiconductor switch includes bidirectional triode thyristor in one of the embodiments,；
The grid of bidirectional triode thyristor is controlled end, a current collection of bidirectional triode thyristor extremely first switch end, bidirectional triode thyristor
Another current collection extremely second switch end.
Carrying out surge protection module includes varistor in one of the embodiments,.
Carrying out surge protection module includes gas-discharge tube in one of the embodiments,.
Above-mentioned surging protection circuit, when first input end or the second input terminal occur being greater than preset threshold surge, first
Judge end or second judge that end is connected with logic output terminal, first switch end is connected with second switch end, carrying out surge protection module
Inhibit surge between access first input end and the second input terminal.Based on this, realize that accurate surge is anti-by threshold value judgment module
Shield avoids damage late-class circuit device or false triggering carrying out surge protection.
Detailed description of the invention
Fig. 1 is the surging protection circuit function structure chart of an embodiment；
Fig. 2 is the threshold value judgment module circuit diagram of an embodiment；
Fig. 3 is the threshold value judgment module circuit diagram of another embodiment；
Fig. 4 is the threshold value judgment module circuit diagram of another embodiment；
Fig. 5 is the controlled switch module circuit diagram of an embodiment；
Fig. 6 is surging protection circuit working timing figure.
Specific embodiment
The purpose of this utility model, technical solution and technical effect in order to better understand, below in conjunction with attached drawing and reality
It applies example and further explaining illustration is carried out to the utility model.It states simultaneously, embodiments described below is only used for explaining this
Utility model is not used to limit the utility model.
The utility model embodiment provides a kind of surging protection circuit:
Fig. 1 is the surging protection circuit function structure chart of an embodiment, as shown in Figure 1, the surge of an embodiment is anti-
Protection circuit includes threshold value judgment module 100, controlled switch module 101 and carrying out surge protection module 102；
The first of threshold value judgment module 100 judge end for connecting first input end, the second of threshold value judgment module 100
Judge end for connect the second input terminal, the logic output terminal of threshold value judgment module 100 is used to connect controlled switch module 101
Controlled end；
The first switch end of controlled switch module 101, the second switch end of controlled switch module 101 and carrying out surge protection module
102 are serially connected between first input end and the second input terminal；
When first input end output is greater than the surge of preset threshold, first judges that end is connected with logic output terminal, makes first
Switch terminals are connected with second switch end, and carrying out surge protection module 102, which accesses between first input end and the second input terminal, inhibits surge；
When the output of second input terminal is greater than the surge of preset threshold, second judges that end is connected with logic output terminal, makes first
Switch terminals are connected with second switch end, and carrying out surge protection module 102, which accesses between first input end and the second input terminal, inhibits surge.
Wherein, when first input end or the second input terminal are greater than the surge of preset threshold, first judges end or second sentences
The broken ends of fractured bone is connected with logic output terminal, and surge is transmitted to controlled end.In general, surge is logic high.Controlled switch 101 by
End is controlled when receiving surge, its first switch end and second switch end is connected.So that 102 one end of carrying out surge protection module receives
Surge and work, inhibit surge.
Fig. 2 is the threshold value judgment module circuit diagram of an embodiment in one of the embodiments, as shown in Fig. 2, threshold
Being worth judgment module 100 includes first diode D1 and the second diode D2；
The cathode of first diode D1 judges end for first, and the cathode of the second diode D2 judges end for second；
The just extremely logic output terminal of the anode of first diode D1 and the second diode D2.
By taking surge occurs in first input end as an example, surge is greater than the reverse turn-on voltages of first diode D1, the one or two pole
Pipe D1 reverse-conducting, surge are transmitted to controlled end.Second diode D2 when there is surge in the second input terminal similarly.
Wherein, Transient Suppression Diode or zener diode can be selected in first diode D1 and the second diode D2.Make
Transient Suppression Diode is selected for preferably embodiment, first diode D1 and a second diode D2.
In one of the embodiments, as shown in Fig. 2, threshold value judgment module 100 further includes the first protective resistance R1 and
Two protective resistance R2；
One end of the first protective resistance R1 of anode connection of first diode D1, the other end of the first protective resistance R1 is to patrol
Collect output end；
One end of the second protective resistance R2 of anode connection of second diode D2, the other end of the second protective resistance R2 is to patrol
Collect output end.
Wherein, pass through the first protective resistance R1 or the second protective resistance R2, limitation output electric current, to protect controlled switch mould
Block 101.
Fig. 3 is the threshold value judgment module circuit diagram of another embodiment in one of the embodiments, as shown in Fig. 3,
Threshold value judgment module 100 further includes adjustable resistance RT；
Logic output terminal by adjustable resistance RT for being grounded.
Wherein, it is adjusted by the resistance value of adjustable resistance RT, changes the current potential of logic output terminal.Based on this, user can pass through
Adjustable resistance RT is adjusted, changes the preset threshold that first switch end and second switch end can be connected indirectly.By changing default threshold
Value, meets different carrying out surge protection demands and different late-class circuit requirement on devices.
Fig. 4 is the threshold value judgment module circuit diagram of another embodiment in one of the embodiments, as shown in Fig. 4,
The threshold value judgment module 100 of another embodiment includes first voltage comparator C1 and second voltage comparator C2；
The non-inverting input terminal of first voltage comparator C1 judges end, the non-inverting input terminal of second voltage comparator C2 for first
End is judged for second；
The inverting input terminal of first voltage comparator C1 and the inverting input terminal of second voltage comparator C2 are patrolled for connecting
Collect low level end；
The output end of first voltage comparator C1 and the output end of second voltage comparator C2 are logic output terminal.
Wherein, in first input end and the second input terminal output surge, the current potential of corresponding non-inverting input terminal, which is higher than, is patrolled
The current potential of low level end is collected, the output end of first voltage comparator C1 or the output end of second voltage comparator C2 export logic
High level, controlled switch module 101 receive logic high and its first switch end and second switch end are connected.
Wherein, its first switch is connected according to the logic-high signal received in the controlled end of controlled switch module 101
End and second switch end.
Semiconductor switch or switch chip can be selected in controlled switch module 101 in one of the embodiments,.Semiconductor is opened
When the controlled end of pass receives logic-high signal, its first switch end or second switch end is connected；Switch chip it is controlled
When termination receives logic-high signal, it is closed first switch end or second switch end.
Fig. 5 is the controlled switch module circuit diagram of an embodiment in one of the embodiments, as shown in Fig. 5, by
Control the bidirectional triode thyristor TR1 that switch module 101 is selected in semiconductor switch.
As shown in figure 5, when surge occur in first input end or the second input terminal, the electricity of the grid G of bidirectional triode thyristor TR1
Position is higher than the cut-in voltage of bidirectional triode thyristor TR1, collector T1 and collector T2 conducting.The access of carrying out surge protection module 102 the
Between one input terminal and the second input terminal.
Carrying out surge protection module 102 includes varistor in one of the embodiments,.
In another embodiment, carrying out surge protection module 102 includes gas-discharge tube.
In order to further explain the utility model embodiment, transient state is selected to inhibit two poles with threshold value judgment module 100
Pipe, controlled switch module 101 select bidirectional triode thyristor TR1, and carrying out surge protection module 102 is selected for varistor MVB1, to this
The course of work of embodiment is illustrated:
Fig. 6 be surging protection circuit working timing figure, as shown in fig. 6, t0 to t1 moment first input end or second input
The maximum amplitude V0 of the voltage Vac at end is less than Transient Suppression Diode conducting voltage V1, therefore bidirectional triode thyristor TR1 grid voltage is
Zero, collector T1, collector T2 end voltage are high level, and the end varistor MOVB1 voltage is zero.At the t2 moment due to first defeated
Entering end or the second input terminal has surge energy input, and voltage Vac is caused to be greater than Transient Suppression Diode conducting voltage V1, transient state suppression
Diode breakdown processed, the bidirectional triode thyristor pole grid G charging, reaches bidirectional triode thyristor TR1 cut-in voltage Vg, bidirectional triode thyristor TR1's
Collector T1, collector T2 conducting.Varistor MOVB1 conducting, rear step voltage is by varistor clamper in pressure sensitive voltage value V2.
When input voltage Vac gradually decreases to V1, Transient Suppression Diode stops working, and bidirectional triode thyristor grid G voltage, which is less than, to be opened
Voltage Vg is opened, but collector T1 and the T2 phase of bidirectional triode thyristor TR1 does not have reversed at this time, therefore bidirectional triode thyristor TR1 is still
It is in the conductive state, so the voltage follow voltage Vac at varistor both ends at this time.It is two-way after the t4 moment is voltage Vac zero passage
Silicon-controlled TR1 collector T1, T2 both end voltage direction, bidirectional triode thyristor turn off TR1.
The surging protection circuit of any of the above-described embodiment occurs being greater than preset threshold in first input end or the second input terminal
When surge, first judges end or second judges that end is connected with logic output terminal, and first switch end is connected with second switch end, wave
It gushes protection module 102 and accesses between first input end and the second input terminal and inhibit surge.Based on this, pass through threshold value judgment module 100
It realizes accurate carrying out surge protection, avoids damage late-class circuit device or false triggering carrying out surge protection.
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
Above embodiments only express the several embodiments of the utility model, and the description thereof is more specific and detailed, but simultaneously
The limitation to utility model patent range therefore cannot be interpreted as.It should be pointed out that for the ordinary skill people of this field
For member, without departing from the concept of the premise utility, various modifications and improvements can be made, these belong to this reality
With novel protection scope.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of surging protection circuit, which is characterized in that including threshold value judgment module, controlled switch module and carrying out surge protection mould
Block；
The first of the threshold value judgment module judges end for connecting first input end, the second judgement of the threshold value judgment module
End for connecting the second input terminal, the logic output terminal of the threshold value judgment module be used to connect the controlled switch module by
Control end；
The first switch end of the controlled switch module, the second switch end of the controlled switch module and the carrying out surge protection mould
Block is serially connected between the first input end and second input terminal；
When the first input end output is greater than the surge of preset threshold, described first judges that end is led with the logic output terminal
It is logical, the first switch end be connected with the second switch end, the carrying out surge protection module access first input end and
Inhibit surge between second input terminal；
When the second input terminal output is greater than the surge of preset threshold, described second judges that end is led with the logic output terminal
It is logical, the first switch end be connected with the second switch end, the carrying out surge protection module access first input end and
Inhibit surge between second input terminal.
2. surging protection circuit according to claim 1, which is characterized in that the threshold value judgment module includes the one or two pole
Pipe and the second diode；
The cathode of the first diode judges end for described first, and the cathode of second diode is second judgement
End；
The just extremely described logic output terminal of the anode and second diode of the first diode.
3. surging protection circuit according to claim 2, which is characterized in that the first diode and the two or two pole
Pipe is Transient Suppression Diode.
4. surging protection circuit according to claim 2, which is characterized in that further include the first protective resistance and the second protection
Resistance；
The anode of the first diode connects one end of first protective resistance, and the other end of first protective resistance is
The logic output terminal；
The anode of second diode connects one end of second protective resistance, and the other end of second protective resistance is
The logic output terminal.
5. surging protection circuit according to claim 2, which is characterized in that further include adjustable resistance；
The logic output terminal by the adjustable resistance for being grounded.
6. surging protection circuit according to claim 1, which is characterized in that the threshold value judgment module includes first voltage
Comparator and second voltage comparator；
The non-inverting input terminal of the first voltage comparator is described first to judge end, the second voltage comparator it is same mutually defeated
Enter end and judges end for described second；
The inverting input terminal of the first voltage comparator and the inverting input terminal of the second voltage comparator are patrolled for connecting
Collect low level end；
The output end of the output end of the first voltage comparator and the second voltage comparator is the logic output terminal.
7. surging protection circuit according to claim 1, which is characterized in that the controlled switch module includes that semiconductor is opened
Off and on closes chip.
8. surging protection circuit according to claim 7, which is characterized in that the semiconductor switch includes two-way controllable
Silicon；
The grid of the bidirectional triode thyristor is the controlled end, the extremely described first switch of a current collection of the bidirectional triode thyristor
End, the extremely described second switch end of another current collection of the bidirectional triode thyristor.
9. surging protection circuit according to claim 1, which is characterized in that the carrying out surge protection module includes pressure-sensitive electricity
Resistance.
10. surging protection circuit according to claim 1, which is characterized in that the carrying out surge protection module includes that gas is put
Fulgurite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920213318.6U CN209344773U (en) | 2019-02-20 | 2019-02-20 | Surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920213318.6U CN209344773U (en) | 2019-02-20 | 2019-02-20 | Surge protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN209344773U true CN209344773U (en) | 2019-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920213318.6U Active CN209344773U (en) | 2019-02-20 | 2019-02-20 | Surge protection circuit |
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| CN (1) | CN209344773U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022133672A1 (en) * | 2020-12-21 | 2022-06-30 | Foshan Ichikoh Valeo Auto Lighting Systems Co., Ltd. | Light assembly for powering lighting functions with different power requirements |
-
2019
- 2019-02-20 CN CN201920213318.6U patent/CN209344773U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022133672A1 (en) * | 2020-12-21 | 2022-06-30 | Foshan Ichikoh Valeo Auto Lighting Systems Co., Ltd. | Light assembly for powering lighting functions with different power requirements |
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