CN208508505U - A kind of protection circuit that can restore automatically - Google Patents
A kind of protection circuit that can restore automatically Download PDFInfo
- Publication number
- CN208508505U CN208508505U CN201821170041.5U CN201821170041U CN208508505U CN 208508505 U CN208508505 U CN 208508505U CN 201821170041 U CN201821170041 U CN 201821170041U CN 208508505 U CN208508505 U CN 208508505U
- Authority
- CN
- China
- Prior art keywords
- triode
- resistance
- voltage
- voltage comparator
- emitter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model relates to the protection circuit that one kind can be restored automatically, including current foldback circuit, overvoltage crowbar, under-voltage protecting circuits；Current foldback circuit includes the first triode, the second triode and first voltage comparator, and the collector of the first triode connects the base stage of the second triode, and the base stage of the first triode is connect with the collector of the second triode；The noninverting input of the collector connection first voltage comparator of second triode；Overvoltage crowbar includes second voltage comparator, and the reverse input end of second voltage comparator connects the emitter of the first triode；Under-voltage protecting circuit includes tertiary voltage comparator, and the noninverting input of tertiary voltage comparator connects the emitter of the first triode；Realize the circuit protection functions such as over-voltage, under-voltage, overcurrent, circuit automatically restores to normal operating conditions after abnormal conditions exclude, and each to protect circuit mutually indepedent, work efficiency is high, and it is widely applicable, it is small in size, it is at low cost.
Description
Technical field
The utility model relates to protect field of circuit technology, the protection that can restore automatically more specifically to one kind is electric
Road.
Background technique
Protect circuit in when there are the abnormal conditions such as overcurrent, over-voltage, under-voltage in circuit should in time power cutoff output,
Ensure to load not because the device of overtension or power supply itself causes to damage because electric current increases；Switching tube is normal in usual circuit
It is in saturation or off state, but if switching tube may work and put when protecting circuit designed unreasonable overcurrent when work
Big state or variable resistance area, power supply still have voltage output, and Simultaneous Switching tube device can be excessively high due to power and fever is led
Cause device failure.
Output can be rapidly switched off when occurring overcurrent in existing circuit but needs manual reset electro after overcurrent condition exclusion
Source could restore to export, and when using the units tests such as transistor, metal-oxide-semiconductor, when switch operating state, has transition region, if control
System is shorter in the time of transition region, and circuit is easy to happen oscillation, and if control, circuit is easy if the time of transition region is longer
Existing imbalance, causes the device power consumptions such as switching tube to get higher situations such as generating heat；Corresponding electricity is had when detecting using logic gate
Range is pressed, when the analog signal voltage value of input cannot be identified effectively not within the voltage range of its logic level.
Utility model content
The technical problem to be solved by the present invention is in view of the above drawbacks of the prior art, provide a kind of work effect
Rate is high, widely applicable, small in size, the at low cost protection circuit that can restore automatically.
The technical scheme adopted by the utility model to solve the technical problem is as follows:
Construct a kind of protection circuit that can restore automatically, including current foldback circuit, overvoltage crowbar, under-voltage protection electricity
Road；Wherein, the current foldback circuit include the first triode, the second triode and first voltage comparator, the described 1st
The collector of pole pipe connects the base stage of second triode, the collection of the base stage of first triode and second triode
Electrode connection；The collector of second triode connects the noninverting input of the first voltage comparator；The over-voltage is protected
Protection circuit includes second voltage comparator, and the reverse input end of the second voltage comparator connects the hair of first triode
Emitter-base bandgap grading；The under-voltage protecting circuit includes tertiary voltage comparator, and the noninverting input of the tertiary voltage comparator connects institute
State the emitter of the first triode.
The protection circuit described in the utility model that can restore automatically, wherein the emitter of first triode connects
Positive pole, the emitter and base stage of first triode are parallel with first resistor；The collector of first triode connects
It is connected to second resistance and first capacitor, the second resistance is in parallel with the first capacitor, the collector of first triode
It is connected with 3rd resistor, the base stage of first triode is connected with the 4th resistance.
The protection circuit described in the utility model that can restore automatically, wherein the other end of the 4th resistance connects institute
State the collector of the second triode, the base stage of second triode pole connects the other end of the 3rd resistor, and described second
The emitter of triode connects the other end of the second resistance；The collector of second triode connects the first voltage
The collector and emitter of the noninverting input of comparator, second triode is parallel with the second capacitor.
The protection circuit described in the utility model that can restore automatically, wherein the protection circuit that can restore automatically is also
Including control circuit, the control circuit includes the 4th voltage comparator, and the noninverting input of the 4th voltage comparator is
Enabled control terminal.
The protection circuit described in the utility model that can restore automatically, wherein the overvoltage crowbar further includes the 5th,
6th resistance, the 5th resistance connect the emitter of first triode, described in the other end connection of the 5th resistance
The reverse input end of 6th resistance and the second voltage comparator, the other end connection the described 2nd 3 of the 6th resistance
The emitter of pole pipe.
The protection circuit described in the utility model that can restore automatically, wherein the under-voltage protecting circuit further includes the 7th,
8th resistance, the 7th resistance connect the emitter of first triode, described in the other end connection of the 7th resistance
The noninverting input of 8th resistance and the tertiary voltage comparator, the other end connection the described 2nd 3 of the 8th resistance
The emitter of pole pipe.
The protection circuit described in the utility model that can restore automatically, wherein the protection circuit that can restore automatically is also
Including voltage regulator circuit, the output end of the voltage regulator circuit connects the reverse input end of the first voltage comparator, described second
The noninverting input of voltage comparator, the reverse input end of the tertiary voltage comparator and the 4th voltage comparator it is reversed
Input terminal.
The protection circuit described in the utility model that can restore automatically, wherein the protection circuit that can restore automatically is also
Including switching circuit, the switching circuit includes third transistor, the emitter connection the described 2nd 3 of the third transistor
The emitter of the emitter and power cathode of pole pipe, the base stage of the third transistor and the third transistor is parallel with third
Capacitor and the tenth resistance.
The protection circuit described in the utility model that can restore automatically, wherein the base stage of first triode is connected with
The other end of 9th resistance, the 9th resistance connects the base stage of the third transistor；The base stage of the third transistor point
The output end of first, second, third, fourth voltage comparator is not connected.
The protection circuit described in the utility model that can restore automatically, wherein the switching circuit further includes the four or three pole
Pipe, the collector of the third transistor are connected with the tenth resistance, and the other end of the tenth resistance connects the four or three pole
The emitter of the base stage of pipe, the 4th triode connects the base stage of first triode；The transmitting of 4th triode
The base stage of pole and the 4th triode is parallel with eleventh resistor；The collector of 4th triode and the three or three pole
The emitter of pipe is parallel with twelfth resistor.
Whether PLSCONFM foregoing description is consistent with the annotation in claims
The utility model has the beneficial effects that: the base voltage of the first triode is more than when route has overcurrent condition generation
Conducting voltage, the second triode is also switched on the first triode ON simultaneously, at this time the noninverting input electricity of first voltage comparator
It forces down in reverse input end voltage, first voltage comparator exports low level, otherwise is restored to normal condition and then exports high level；
When occurring overpressure situation in route, the reverse input end voltage of second voltage comparator is higher than noninverting input voltage, the second electricity
It presses comparator to export low level, otherwise is restored to normal condition then to export high level；The third when occurring undervoltage condition in route
The noninverting input voltage of voltage comparator is less than reverse input end voltage, and tertiary voltage comparator exports low level, otherwise extensive
Normal condition is arrived again then exports high level；Realize the circuit protection functions such as over-voltage, under-voltage, overcurrent, electricity after abnormal conditions exclude
Road automatically restores to normal operating conditions, and each to protect circuit mutually indepedent, work efficiency is high, widely applicable, small in size, cost
It is low.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below in conjunction with attached drawing
And the utility model is described in further detail for embodiment, the accompanying drawings in the following description is only that the part of the utility model is implemented
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other accompanying drawings:
Fig. 1 is the protection circuit circuit diagram that can restore automatically of the utility model preferred embodiment；
Fig. 2 is when overcurrent occurs for the protection circuit scene one that can restore automatically of the utility model preferred embodiment and overcurrent
The voltage change schematic diagram of A test point, B test point, VO test point after elimination；
Fig. 3 be the utility model preferred embodiment one overcurrent of protection circuit scene that can restore automatically during the second capacitor
The voltage change schematic diagram of B test point in charge and discharge process.
Specific embodiment
It is practical below in conjunction with this in order to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Technical solution in new embodiment carries out clear, complete description, it is clear that described embodiment is the portion of the utility model
Point embodiment, rather than whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not being paid
Every other embodiment obtained, belongs to the protection scope of the utility model under the premise of creative work.
The utility model preferred embodiment as shown in Figure 1, simultaneously referring to Fig.2, Fig. 3 includes current foldback circuit, over-voltage
Protect circuit, under-voltage protecting circuit；It is characterized in that, current foldback circuit include the first triode Q2, the second triode Q3 and
The collector of first voltage comparator U1, the first triode Q2 connect the base stage of the second triode Q3, the base of the first triode Q2
Pole is connect with the collector of the second triode Q3, and the emitter of the first triode Q2 connects positive pole；Second triode Q3's
The noninverting input 5 of collector connection first voltage comparator U1；The emitter of second triode Q3 connects power cathode；Over-voltage
Protection circuit includes second voltage comparator U3, the reverse input end 8 of second voltage comparator U3 through resistance R12 connection power supply just
Pole, through resistance R13 connection power cathode；Under-voltage protecting circuit includes tertiary voltage comparator U4, tertiary voltage comparator U4's
Noninverting input 11 is through resistance R14 connection positive pole, through resistance R15 connection power cathode；When route has overcurrent condition generation
The base voltage of first triode Q2 is more than conducting voltage, and the second triode Q3 is also switched on simultaneously for the first triode Q2 conducting, this
When first voltage comparator U1 5 voltage of noninverting input be lower than 4 voltage of reverse input end, first voltage comparator U1 output is low
Level, on the contrary it is restored to normal condition and then exports high level；The second voltage comparator U3 when occurring overpressure situation in route
8 voltage of reverse input end is higher than 9 voltage of noninverting input, and second voltage comparator U3 exports low level, otherwise is restored to normal
State then exports high level；When occurring undervoltage condition in route, 11 voltage of noninverting input of tertiary voltage comparator U4 is less than
Reverse input end voltage 10, tertiary voltage comparator U4 export low level, otherwise are restored to normal condition and then export high level；It is real
The circuit protection functions such as existing over-voltage, under-voltage, overcurrent, circuit automatically restores to normal operating conditions after abnormal conditions exclude, respectively
Protect circuit mutually indepedent, work efficiency is high, and it is widely applicable, it is small in size, it is at low cost.
As shown in Figure 1, the emitter of the first triode Q2 connects positive pole, the emitter and base stage of the first triode Q2
It is parallel with first resistor R1；The collector of first triode Q2 is connected with second resistance R9 and first capacitor C2, second resistance R9
C2 in parallel with first capacitor, the collector of the first triode Q2 are connected with 3rd resistor R8, the base stage connection of the first triode Q2
There is the 4th resistance R2；The anti-interference ability of circuit is improved, operation stability is enhanced.
As shown in Figure 1, the other end of the 4th resistance R2 connects the collector of the second triode Q3, the second triode pole Q3's
Base stage connects the other end of 3rd resistor R8, the other end of the emitter connection second resistance R9 of the second triode Q3；Two or three
The noninverting input 5 of the collector connection first voltage comparator U1 of pole pipe Q3, the collector and emitter of the second triode Q3
It is parallel with the second capacitor C1；The anti-interference ability of circuit is further increased, operation stability is enhanced.
As shown in Figure 1, the protection circuit that can restore automatically further includes control circuit, control circuit includes that the 4th voltage compares
The noninverting input 7 of device U4, the 4th voltage comparator U4 are enabled control terminal Ctrl；So that use scope is more extensive, with into one
Step meets the needs of different.
As shown in Figure 1, overvoltage crowbar further includes the five, the 6th resistance R12, R13, the 5th resistance R12 connection first
The emitter of triode Q2, other end connection the 6th resistance R13's and second voltage comparator U3 of the 5th resistance R12 is reversed
Input terminal 8, the other end of the 6th resistance R13 connect the emitter of the second triode Q3；Structure is simple, at low cost.
As shown in Figure 1, under-voltage protecting circuit further includes the 7th, and the 8th resistance R14, R15, the 7th resistance R14 connection first
The emitter of triode Q2, other end connection the 8th resistance R15's and tertiary voltage comparator U4 of the 7th resistance R14 is in the same direction
Input terminal 11, the other end of the 8th resistance R15 connect the emitter of the second triode Q3；Structure is simple, at low cost.
As shown in Figure 1, the protection circuit that can restore automatically further includes voltage regulator circuit, the output end connection first of voltage regulator circuit
The reverse input end 4 of voltage comparator U1, the noninverting input 8 of second voltage comparator U3, tertiary voltage comparator U4 it is anti-
To input terminal 10 and the reverse input end 6 of the 4th voltage comparator U2.
As shown in Figure 1, the protection circuit that can restore automatically further includes switching circuit, switching circuit includes third transistor
The emitter of Q4, third transistor Q4 connect the emitter and power cathode of the second triode Q3, the base stage of third transistor Q4
Third capacitor C3 and the tenth resistance R11 are parallel with the emitter of third transistor Q4；Further increase the anti-interference energy of circuit
Power enhances operation stability.
As shown in Figure 1, the base stage of the first triode Q2 is connected with the 9th resistance R4, the other end connection of the 9th resistance R4 the
The base stage of three triode Q4；The base stage of third transistor Q4 be separately connected the first, second, third, fourth voltage comparator U1,
The output end of U3, U4, U2；.
As shown in Figure 1, switching circuit further includes the 4th triode Q1, the collector of third transistor Q4 is connected with the tenth electricity
R6 is hindered, the other end of the tenth resistance R6 connects the base stage of the 4th triode Q1, the emitter connection the one or three of the 4th triode Q1
The base stage of pole pipe Q2；The emitter of 4th triode Q1 and the base stage of the 4th triode Q1 are parallel with eleventh resistor R5；4th
The collector of triode Q1 and the emitter of third transistor Q4 are parallel with twelfth resistor R7；.
Scene one；
Such as Fig. 1, Fig. 2, shown in Fig. 3, supply voltage is that the inverting input terminal that 24V voltage regulator circuit is first voltage comparator mentions
For the burning voltage of 3.0V, when powering on initial, 24V power supply is charged by R2 to C1, when the voltage of C1 does not reach 3.0V the
The output end of one voltage comparator is low level, and the output end that Q4 and Q1 end first voltage comparator does not have voltage output；It can
The time about 27ms that the end C1 B point voltage rises to from 0V reference point voltage 3.0V is calculated according to capacitor charging time；Work as B
First voltage comparator exports high level when point voltage is greater than 3.0V, Q4 and Q1 turn-on power begins with output.
R1 both end voltage is lower when circuit works normally, and PNP type triode Q2 is in off state, and Q3 is also at cut-off shape
State.
When route has overcurrent condition generation, R1 both end voltage is more than the conducting voltage of Q2, and Q2 is connected A point voltage and increases C2
Charging Q3 conducting, capacitor C1 are had by Q3 collector electric discharge B point voltage meeting rapid decrease, when voltage drops to 3.0V or less
First voltage comparator output terminal becomes low level Q4 cut-off, the output of Q1 stopping power supply.
Not having electric current to flow through R1 both end voltage again in route after switching tube Q1 cut-off becomes 0V, Q2 cut-off, due to existing
Capacitor C2, A point voltage, which will not immediately become 0V, Q3 also and will continue to the conducting C1 B point voltage decline that continues to discharge, can drop to 3.0V
Hereinafter, Q3 just ends when below the conducting voltage that A point voltage drops to Q3；C1 can be filled again by R2 after Q3 cut-off
Electricity, when B point voltage is greater than 3.0V, the output end of first voltage comparator becomes high level, Q1 be connected R1 both end voltage again on
Rise, Q3 conducting C1 discharge further through Q3, B point voltage be re-lowered to 3.0V or less at this time first voltage comparator output end become
For low level Q1 cut-off.
It can be seen that the device parameters of the selection by Fig. 1, the charging time of C1 is about 1.7ms, and C1's puts from Fig. 2, Fig. 3
The electric time is about 6us.The discharge time of C1 is almost equal with the time of the conducting of Q1, and the charging time of C1 is to control Q1 conducting
Time interval.
Continuing period C1 in overcurrent condition can persistently be charged, discharged, the interval Q1 conducting and turn-on time is especially short several
It will not generate heat；The charging time of C1 and R2 have direct relation, and the discharge time of C1 and C2, R9, R8, Q3, C3 have relationship；C2,
C3 is nonessential device, adjusting device parameter or can not had to according to actually reopening time interval；Furthermore Q4 makes in Fig. 1
Triode, the conducting voltage of triode is 0.6V or so, if using Q4 instead metal-oxide-semiconductor, the conducting voltage of metal-oxide-semiconductor compared with
Height can then obtain and longer reopen time interval.
From Fig. 2, the simulation result of Fig. 3 be can be seen that during overcurrent condition continues, and switching tube interval is opened, after opening
It can rapidly switch off again and oscillatory condition do not occur, once overcurrent condition excludes that then 3.0V or more can be reached in the charging of C1 next time
The automatic recovery output of Q1 conducting can be controlled.
Scene two；
Such as Fig. 1, Fig. 2, the fully charged B point voltage of rear C1 is powered on shown in Fig. 3 greater than 3.0V, the high electricity of first voltage comparator output
Flat, at this time if Ctrl signal is less than 3.0V, second voltage comparator exports low level, because the output end of two comparators is straight
Connect be connected constitute line and logical relation, C point voltage is still that low level Q4, Q1 is in off state power supply and does not export.
It is greater than 3.0V in B point voltage, when Ctrl signal voltage value is greater than 3.0V, the output of second voltage comparator is high electricity
Flat, the output of two comparators is all that high level C point is just the output of high level Q4, Q1 turn-on power.
When Ctrl signal is greater than 3.0V, in case of overcurrent condition when power supply normally exports, then above to the work shape of Fig. 1
State explanation, Q3 conducting, C1 can discharge by Q3, so that B point voltage is lower, first voltage comparator exports low level, Q4, Q1
All cut-off power remove output；When B point voltage drops to 3.0V or less, the output of first voltage comparator is high level then meeting again
Rapidly go to it is low, if overcurrent condition continue during, so that Ctrl signal is become 3.0V hereinafter, if Q4, Q1 can be constantly in cut
Only state, power supply never export.
Scene three；
Such as Fig. 1, Fig. 2, the output end of four voltage comparators shown in Fig. 3 is connected directly, and one of comparator output is
C point voltage, which just becomes low Q4, Q1, when low becomes off state.
When input voltage be 24V when, through R12, R13 series connection partial pressure after E point voltage be 2.6V, second voltage comparator it is same
Phase input terminal voltage is greater than inverting input terminal, exports as height；If voltage change is increased beyond 27V, E point voltage is greater than 3.0V,
The non-inverting input terminal voltage of second voltage comparator is less than inverting input terminal, and output becomes low, switching circuit power cutoff output,
Realize overvoltage protection；When input voltage is restored to 27V or less, the output of second voltage comparator becomes high, and Q4, Q1 will be led
It is logical, there is power supply output.
When input voltage be 24V when, through R14, R15 series connection partial pressure after F point voltage be 3.4V, tertiary voltage comparator it is same
Phase input terminal voltage is greater than inverting input terminal, exports as height；If input voltage drops to 21V hereinafter, F point voltage is less than
3.0V, the non-inverting input terminal voltage of tertiary voltage comparator are less than inverting input terminal, and output becomes low, switching circuit power cutoff
Under-voltage protection is realized in output；When input voltage is restored to 21V or more, the output of tertiary voltage comparator becomes high level,
Q4, Q1 will be connected, and have power supply output；Overvoltage crowbar is mutually indepedent with under-voltage protecting circuit, can only use wherein one
Kind protection circuit.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations all should belong to the protection scope of the appended claims for the utility model.
Claims (10)
1. the protection circuit that one kind can be restored automatically, including current foldback circuit, overvoltage crowbar, under-voltage protecting circuit；Its
Be characterized in that, the current foldback circuit include the first triode, the second triode and first voltage comparator, the described 1st
The collector of pole pipe connects the base stage of second triode, the collection of the base stage of first triode and second triode
Electrode connection；The collector of second triode connects the noninverting input of the first voltage comparator；The over-voltage is protected
Protection circuit includes second voltage comparator, and the reverse input end of the second voltage comparator connects the hair of first triode
Emitter-base bandgap grading, i.e. positive pole；The under-voltage protecting circuit includes tertiary voltage comparator, the tertiary voltage comparator it is in the same direction defeated
Enter the emitter that end connects first triode, i.e. positive pole.
2. the protection circuit according to claim 1 that can restore automatically, which is characterized in that the transmitting of first triode
Pole connects positive pole, and the emitter and base stage of first triode are parallel with first resistor；The collection of first triode
Electrode is connected with second resistance and first capacitor, and the second resistance is in parallel with the first capacitor, first triode
Collector is connected with 3rd resistor, and the base stage of first triode is connected with the 4th resistance.
3. the protection circuit according to claim 2 that can restore automatically, which is characterized in that the other end of the 4th resistance
The collector of second triode is connected, the base stage of second triode pole connects the other end of the 3rd resistor, institute
The emitter for stating the second triode connects the other end of the second resistance；The collector connection described the of second triode
The collector and emitter of the noninverting input of one voltage comparator, second triode is parallel with the second capacitor.
4. the protection circuit according to claim 1 that can restore automatically, which is characterized in that the protection that can restore automatically
Circuit further includes control circuit, the control circuit include the 4th voltage comparator, the 4th voltage comparator it is in the same direction defeated
Enter end for enabled control terminal.
5. the protection circuit according to claim 1 that can restore automatically, which is characterized in that the overvoltage crowbar also wraps
The five, the 6th resistance are included, the 5th resistance connects the emitter of first triode, and the other end of the 5th resistance connects
The reverse input end of the 6th resistance and the second voltage comparator is connect, described in the other end connection of the 6th resistance
The emitter of second triode, i.e. power cathode.
6. the protection circuit according to claim 1 that can restore automatically, which is characterized in that the under-voltage protecting circuit also wraps
The 7th is included, the 8th resistance, the 7th resistance connects the emitter of first triode, and the other end of the 7th resistance connects
The noninverting input of the 8th resistance and the tertiary voltage comparator is connect, described in the other end connection of the 8th resistance
The emitter of second triode, i.e. power cathode.
7. the protection circuit according to claim 4 that can restore automatically, which is characterized in that the protection that can restore automatically
Circuit further includes voltage regulator circuit, and the output end of the voltage regulator circuit connects the reverse input end of the first voltage comparator, institute
State the noninverting input of second voltage comparator, the reverse input end and the 4th voltage comparator of the tertiary voltage comparator
Reverse input end.
8. the protection circuit according to claim 1 that can restore automatically, which is characterized in that the protection that can restore automatically
Circuit further includes switching circuit, and the switching circuit includes third transistor, described in the emitter connection of the third transistor
The emitter and power cathode of second triode, the base stage of the third transistor are in parallel with the emitter of the third transistor
There are third capacitor and the tenth resistance.
9. the protection circuit according to claim 8 that can restore automatically, which is characterized in that the base stage of first triode
It is connected with the 9th resistance, the other end of the 9th resistance connects the base stage of the third transistor；The third transistor
Base stage is separately connected the output end of first, second, third, fourth voltage comparator.
10. the protection circuit according to claim 8 that can restore automatically, which is characterized in that the switching circuit further includes
4th triode, the collector of the third transistor are connected with the tenth resistance, described in the other end connection of the tenth resistance
The emitter of the base stage of 4th triode, the 4th triode connects the base stage of first triode；Four or three pole
The base stage of the emitter of pipe and the 4th triode is parallel with eleventh resistor；The collector of 4th triode with it is described
The emitter of third transistor is parallel with twelfth resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821170041.5U CN208508505U (en) | 2018-07-24 | 2018-07-24 | A kind of protection circuit that can restore automatically |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821170041.5U CN208508505U (en) | 2018-07-24 | 2018-07-24 | A kind of protection circuit that can restore automatically |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208508505U true CN208508505U (en) | 2019-02-15 |
Family
ID=65290118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821170041.5U Active CN208508505U (en) | 2018-07-24 | 2018-07-24 | A kind of protection circuit that can restore automatically |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208508505U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683153A (en) * | 2018-07-24 | 2018-10-19 | 深圳市泛海三江电子股份有限公司 | Protection circuit capable of automatically recovering |
| CN112993933A (en) * | 2021-04-22 | 2021-06-18 | 宜宾听点科技有限公司 | Self-recovery protection circuit and device |
-
2018
- 2018-07-24 CN CN201821170041.5U patent/CN208508505U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683153A (en) * | 2018-07-24 | 2018-10-19 | 深圳市泛海三江电子股份有限公司 | Protection circuit capable of automatically recovering |
| CN108683153B (en) * | 2018-07-24 | 2024-01-23 | 深圳市高新投三江电子股份有限公司 | Protection circuit capable of automatically recovering |
| CN112993933A (en) * | 2021-04-22 | 2021-06-18 | 宜宾听点科技有限公司 | Self-recovery protection circuit and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103149852B (en) | Control circuit of time relay | |
| CN203056953U (en) | Driver and bus capacitor discharge circuit thereof | |
| CN208299427U (en) | Overvoltage crowbar and over-pressure safety device | |
| CN208508505U (en) | A kind of protection circuit that can restore automatically | |
| CN202260378U (en) | Leakage protector | |
| CN100426614C (en) | High voltage protective device for input of AC electrical source | |
| CN107635343B (en) | Input detection protection circuit and alternating current electronic ballast for HID lamp | |
| CN101552451A (en) | Switch power supply cycle-by-cycle wave over-voltage protection circuit | |
| CN102843049B (en) | Rectifier voltage regulator for motorcycles | |
| CN204740985U (en) | A relay control circuit for converter | |
| CN108683153A (en) | Protection circuit capable of automatically recovering | |
| CN104617782B (en) | Anti-surging current device, Anti-surging current methods and household electrical appliance | |
| CN204243716U (en) | Electric device fault secure circuit | |
| CN202634313U (en) | Inverter | |
| CN202306368U (en) | Novel surge control circuit | |
| CN202026162U (en) | Current coupling power taking device for high-tension transmission line | |
| CN203287705U (en) | Control circuit of time relay | |
| CN215378425U (en) | Intelligent direct current power supply system | |
| CN201352738Y (en) | Wide power supply circuit | |
| CN205265230U (en) | Voltage controller is owed in outage time delay | |
| CN104184128A (en) | Battery discharge protection method and circuit and lamp thereof | |
| CN203205828U (en) | LED driving power supply input overvoltage protection circuit | |
| CN208028644U (en) | A kind of bank base station device of solar generating | |
| CN201278457Y (en) | Computer intelligent complete shut-down protector with over-voltage protection | |
| CN202103592U (en) | Rectification voltage regulator of motorcycle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 518000 the three floor of the new world apartment, Nanshan Avenue, Nanshan District, Shenzhen, Guangdong (for office only). Patentee after: Shenzhen hi tech investment Sanjiang Electronics Co.,Ltd. Address before: 518000 F3, Guangcai Xintiandi apartment, Nanshan Avenue, Nanshan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN FANHAI SANJIANG ELECTRONICS Co.,Ltd. |