CN208890344U - A kind of protection circuit and electronic equipment - Google Patents
A kind of protection circuit and electronic equipment Download PDFInfo
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- CN208890344U CN208890344U CN201821891271.0U CN201821891271U CN208890344U CN 208890344 U CN208890344 U CN 208890344U CN 201821891271 U CN201821891271 U CN 201821891271U CN 208890344 U CN208890344 U CN 208890344U
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Abstract
The utility model discloses a kind of protection circuit and electronic equipments.The protection circuit includes: the first branch and the first open failure type device; the first branch includes the first protection location and the first boosting unit being connected in series; first protection location is used for overcurrent and/or earth leakage protective, and first boosting unit is used for the curent change in response to the first branch and boosts；The first open failure type device is connected in parallel in the both ends of the first branch.The utility model solves the problems, such as that the protective performance of existing protection circuit is bad, improves the protective performance of protection circuit.
Description
Technical field
The utility model embodiment is related to electronic circuit technology field more particularly to a kind of protection circuit and electronic equipment.
Background technique
Electronic equipment is in rail traffic, automotive electronics, communication, new energy, security protection, consumer electronics, industrial electronic, medical electric
The industries such as son are widely used, and can the superiority and inferiority of performance be directly related to relevant device and safely and reliably work.
In order to guarantee that electronic equipment can safely and reliably work, mostly in electronic equipment power source port design protection circuit.
In the prior art, the protection device in circuit is protected once damaging or malfunctioning, it would be possible to cause entirely to protect circuit malfunction
Or the normal operation of late-class circuit is influenced, therefore the protective performance of existing protection circuit is bad, is easy to influence late-class circuit
Normal work.
Utility model content
The utility model provides a kind of protection circuit and electronic equipment, to promote the protective performance of protection circuit.
In a first aspect, the utility model embodiment provides a kind of protection circuit, which includes:
The first branch, the first branch include the first protection location and the first boosting unit being connected in series, and described the
One protection location be used for overcurrent and/or earth leakage protective, first boosting unit be used in response to the first branch curent change and
Boosting；
First open failure type device, is connected in parallel in the both ends of the first branch.
Optionally, the inductance value of first boosting unit to be struck by lightning in the protection circuit or surge current
When, the voltage at the first open failure type device both ends is higher than its operation voltage, and the shunting in the first branch is lower than described
The action current of first protection location.
Optionally, the inductance value of first boosting unit makes in the late-class circuit overload of the protection circuit, institute
The voltage at the first open failure type device both ends is stated lower than its operation voltage, and the shunting in the first branch is higher than described the
The action current of one protection location.
Optionally, first boosting unit includes the differential mode inductance being connected in series with first protection location.
Optionally, first protection location includes the air-break circuit-breaker being connected in series with first boosting unit, protects
At least one of dangerous silk or earth leakage circuit-breaker.
Optionally.Protecting circuit further includes second branch；
First boosting unit includes the first coil of common mode inductance, the first coil of the common mode inductance and described the
One protection location is connected in series；The second branch includes the second boosting unit, and second boosting unit includes the common mode
Second coil of inductance, the second coil of the common mode inductance are connected in series in the both ends of the second branch.
Optionally, protection circuit further includes the second protection location, second protection location and second boosting unit
It is connected in series.
Optionally, protection circuit further includes the second open failure type device, and the second open failure type device parallel connection connects
It is connected to the both ends of the second branch.
Optionally, the first branch is high-voltage alternating power supply line, high voltage direct current power supply line, low-voltage alternating-current supply lines
One of road low-voltage DC supply route or signal line.
Second aspect, the utility model embodiment additionally provide a kind of electronic equipment, and the electronic equipment includes at least one
It is a to protect circuit as provided by the utility model any embodiment.
The first protection location and the first boosting of series connection is arranged in the utility model in the first branch of protection circuit
Unit is connected in parallel the first open failure type device at the both ends of the first branch, and the first protection location is used for overcurrent and/or electric leakage
Protection, the first boosting unit are used for the curent change in response to the first branch and boost.Compared with prior art, the utility model is real
Working frequency overcurrent and lightning surge overcurrent can effectively be distinguished by applying example, it is ensured that protection circuit is in normal operating conditions and work
Under working frequency overcurrent protection state, the first protection location executes normal operation, and in the transient state of lightning stroke or surge generation
In the case where overcurrent, the first protection location will not be malfunctioned, late-class circuit understands normal power supply, and on this basis, and first
Open failure type device can realize open failure function once damaging, and avoid line short conducting, further improve guarantor
The protective performance of protection circuit is conducive to product safety certification.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram for protecting circuit provided by the embodiment of the utility model；
Fig. 2 is the circuit diagram of another protection circuit provided by the embodiment of the utility model；
Fig. 3 is the circuit diagram of another protection circuit provided by the embodiment of the utility model；
Fig. 4 is the circuit diagram of another protection circuit provided by the embodiment of the utility model；
Fig. 5 is the circuit diagram of another protection circuit provided by the embodiment of the utility model；
Fig. 6 is the circuit diagram of another protection circuit provided by the embodiment of the utility model；
Fig. 7 is the structural schematic diagram of a kind of electronic equipment provided by the embodiment of the utility model.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.
The utility model embodiment provides a kind of protection circuit.The protection circuit can be applied to AC power source mouth, direct current
Power port or signal port realize the protection to alternating current circuit, DC circuit or signal circuit.Fig. 1 is the utility model embodiment
A kind of circuit diagram of the protection circuit provided.Referring to Fig. 1, which includes the first branch 10, and the first branch 10 includes string
Join the first protection location 110 and the first boosting unit 120 of connection, the first protection location 110 is protected for overcurrent and/or electric leakage
Shield, the first boosting unit 120 are used for the curent change in response to the first branch and boost.The protection circuit further includes that the first open circuit is lost
Acting type device 20, the first open failure type device 20 are connected in parallel in the both ends of the first branch 10.
Wherein, the first branch 10 can be power circuit or signal line.First boosting unit 120 is according to the electric current flowed through
The size of value determines the voltage swing at its both ends.Illustratively, when electric current is excessive or the change rate of electric current is excessive, first liter
The voltage at pressure 120 both ends of unit steeply rises, and the first boosting unit 120 for example can be inductance, resistance or by least one electricity
The circuit structure of sense and/or the electrical connection of at least one resistance.First open failure type device 20 for example can be open failure and put
Fulgurite (Open Circuit Gas Discharge Tube, 0GDT), the first open failure type device 20 be it is a kind of without lightning stroke or
It is in high-impedance behavior when surge instantaneous overvoltage, once response lightning stroke or overvoltage surge, change in the instantaneous impedance is low impedance characteristic,
Allow to be struck by lightning or surge overcurrent passes through, and once damage, realizes the protective device of open failure function.First open failure
The ability of the lightning stroke of 20 bleed off of type device or surge energy is strong, and main function in circuit is bleed off instantaneous high pressure energy, if hair
Raw damage can be in off state, not will cause and mislead.However in the prior art, protection circuit mostly uses semiconductor to put
Fulgurite (Thyristor Surge Suppresser, TSS), metal oxide varistor (Metal Oxide Varistor,
MOV), gas-discharge tube (Gas Discharge Tube, GDT) or Transient Suppression Diode (Transient Voltage
Suppressor, TVS), after short-circuit failure occurs for these protective devices, appearance is protected and is not monitored in circuit without significant change
And report and alarm, so only with protective devices such as TSS, MOV, GDT or TVS in protection circuit, if short circuit, meeting occur after damage
By 10 short circuit of the first branch in the first branch 10, the first protection location 110 is caused not work, there are biggish safety is hidden
Suffer from.Compared with prior art, the utility model embodiment uses the first open failure type device 20, once damage, the first open circuit
Failure type device 20 can realize open failure function, avoid line short conducting, improve the protective performance of protection circuit,
Be conducive to product safety certification.
The working condition of the protection circuit mainly includes 3 classes: the 1st class is normal operating conditions, in normal operation,
Power supply is powered by the first branch 10 to late-class circuit, and working frequency electric current passes through from the first branch 10, the first boosting unit 120
The voltage that both ends sense is lower, and the conducting voltage of the first open failure type device 20, the first open failure type device is not achieved
20 are not turned on；2nd class is working frequency overcurrent protection state, (is held when overcurrent and/or leak current fault occurs in late-class circuit
The continuous time, working frequency electric current increased usually in 10ms or more), the voltage that 120 both ends of the first boosting unit sense still compared with
Low, the first open failure type device 20 is not turned on, however when working frequency electric current is more than the thresholding of the first protection location 110,
The movement of first protection location 110, late-class circuit power supply stop；3rd class is lightning stroke or surge current protection state, when being struck by lightning
Or when surge current (duration, the voltage that 120 both ends of the first boosting unit sense rapidly rose usually in 1ms or less),
The voltage at 20 both ends of the first open failure type device is caused rapidly to rise, when the movement electricity more than the first open failure type device 20
When pressure, the conducting of the first open failure type device 20, most of lightning stroke or surge current are passed through by the first open failure type device 20,
The first protection location 110 will not be made to malfunction, power supply is still powered to late-class circuit, avoids under lightning stroke or surge current the
The malfunction of one protection location 110, thus the case where causing the equipment downtime of late-class circuit, needing manual reversion or repair, and
It avoids the equipment live in Restoration Process of Artificial Spruce and gives operator's progress Operation and Maintenance bring risk, it is ensured that electricity consumption peace
Entirely.
The first protection location 110 and the first boosting of series connection is arranged in the utility model embodiment in the first branch 10
Unit 120 is connected in parallel the first open failure type device 20 at the both ends of the first branch 10, and the first protection location 110 was used for
Stream and/or earth leakage protective, the first boosting unit 120 are used for the curent change in response to the first branch 10 and boost.With the prior art
It compares, the utility model embodiment can effectively distinguish working frequency overcurrent and lightning surge overcurrent, it is ensured that protection circuit
Under normal operating conditions and working frequency overcurrent protection state, the first protection location 110 executes normal operation, and
In the case where the transient over-current that lightning stroke or surge generate, the first protection location 110 will not be malfunctioned, late-class circuit can be supplied normally
Electricity, and on this basis, the first open failure type device 20 can realize open failure function, avoid the line once damaging
Short out road conducting, further improves the protective performance of protection circuit, is conducive to product safety certification.
In the above-described embodiments, optionally, the first branch 10 be high-voltage alternating power supply line, high voltage direct current power supply line,
One of low-voltage alternating-current power supply line, low-voltage DC supply route or signal line, to realize to high-voltage alternating power supply, height
Press direct current supply, low-voltage alternating-current power supply, the protection of low-voltage DC supply or signal line.
In the above-described embodiments, optionally, by adjusting the parameter of the first boosting unit 120, adjustable lightning stroke or wave
Shunting of the electric current in the first branch 10 is gushed, specifically, the inductance value of the first boosting unit 120 makes in protection circuit by thunder
It hits or when surge current, the voltage at 20 both ends of the first open failure type device is higher than its operation voltage, and in the first branch 10
The action current for being lower than the first protection location 110 is shunted, so that it is guaranteed that the protection circuit is in the same of release lightning stroke or surge current
When, the first branch 10 can continue to power to late-class circuit.
Optionally, the inductance value of the first boosting unit 120 makes in the late-class circuit overload for protecting circuit, the first open circuit
The voltage at 20 both ends of failure type device is lower than its operation voltage, and the shunting in the first branch 10 is higher than the first protection location 110
Action current, so that it is guaranteed that the protection circuit late-class circuit overload when, the first protection location 110 can act in time, make
It is not damaged to obtain late-class circuit.
In the above embodiments, optionally, the first protection location 110 with the series connection of the first boosting unit 120 is
Breaker protector specifically includes at least one of air-break circuit-breaker, fuse or earth leakage circuit-breaker.Fig. 2 is that this is practical new
The circuit diagram for another protection circuit that type embodiment provides, referring to fig. 2, which is air-break circuit-breaker.It is empty
Gas breaker also known as air switch, as long as being the switch that electric current is more than rated current will disconnect automatically in one kind circuit.For example,
When the protection circuit is applied to low voltage power distribution network, the first protection location 110 can be to late-class circuit using air-break circuit-breaker
Or the failures such as short circuit, heavy overload and under-voltage of electrical equipment generation are protected.Fig. 3 provides for the utility model embodiment
Another protection circuit circuit diagram.Referring to Fig. 3, which is fuse.Fuse is main in circuit
Play overload protection, when current anomaly is increased to certain height and temperature, fuse itself fusing cutting electricity
Stream, protects the safe operation of circuit.For example, when the protection circuit is applied in the electronic circuits such as automobile, lathe or electrical instrumentation,
First protection location 110 can carry out overcurrent and overheating protection to electronic circuits such as automobile, lathe or electrical instrumentations using fuse.
It should be noted that in the above-described embodiments, there are many set-up modes of the first boosting unit 120, and Fig. 1-Fig. 3 shows
Showing to example property the first boosting unit 120 includes with the differential mode inductance of the first protection location 110 series connection or with boosting
The coiling of effect, not to the restriction of the utility model, in other embodiments, can also according to the design feature of circuit,
First boosting unit 120 is set.Fig. 4 is the circuit diagram of another protection circuit provided by the embodiment of the utility model.Referring to figure
4, which further includes second branch 30.First boosting unit 120 includes the first coil of common mode inductance, common mode inductance
First coil and the first protection location 110 are connected in series；Second branch 30 includes the second boosting unit 320, the second boosting unit
320 include the second coil of common mode inductance, and the second coil of common mode inductance is connected in series in the both ends of second branch 30.Wherein,
The first branch 10 can be the firewire L in AC power source (AC power supplies), and second branch 30 can be the zero curve N in AC power source；
Alternatively, the first branch 10 can be the zero curve N in AC power source, second branch 30 can be the firewire L in AC power source.First
Boosting unit 120 is in this way, when can to make late-class circuit be power circuit, the common mode electricity that plays a filtering role in power circuit
Sense reusable is the first boosting unit 120 protected in circuit, protects the first boosting unit that no setting is required additionally in circuit
120, to simplify the circuit structure of protection circuit, save the use of component.
Fig. 5 is the circuit diagram of another protection circuit provided by the embodiment of the utility model.Referring to Fig. 5, circuit is protected also
Including the second protection location 310, the second protection location 310 and the second boosting unit 320 are connected in series, the second protection location 310
For overcurrent and/or earth leakage protective, for the utility model on the basis of the first protection location 110 are arranged, the second protection of setting is single
Member 310 further improves the protective performance of protection circuit.
With continued reference to Fig. 5, on the basis of the various embodiments described above, protection circuit further includes the second open failure type device
40, the second open failure type device 40 is connected in parallel in the both ends of second branch 30, and the second open failure type device 40 is for rushing down
Lightning stroke or surge current are put, the voltage that 320 both ends of the second boosting unit sense rapidly rises, and leads to the second open failure type device
The voltage at 40 both ends of part rapidly rises, when more than the operation voltage of the second open failure type device 40, the second open failure type
Device 40 is connected, and most of lightning stroke or surge current are passed through by the second open failure type device 40, will not make the second protection location
310 malfunctions, power supply are still powered to late-class circuit, and the utility model embodiment is in the first branch 10 and the first open failure type
On the basis of device 20, second branch 30 and the second open failure type device 40 are set, further improve the anti-of protection circuit
Protect performance.
Fig. 6 is the circuit diagram of another protection circuit provided by the embodiment of the utility model.Referring to Fig. 6, optionally, first
Protection location 110 is a Xiang Kaiguan of earth leakage circuit-breaker 50, and the second protection location 310 is another phase of earth leakage circuit-breaker 50
Late-class circuit can not only be switched on or switched off as other breakers by switch, earth leakage circuit-breaker 50, but also have to electric leakage
The function of stream detection and judgement, when electric leakage or insulation breakdown occur in late-class circuit, earth leakage circuit-breaker 50 can be according to judgement
As a result late-class circuit is switched on or switched off.For example, when the protection circuit is applied to low voltage power distribution network, earth leakage circuit-breaker 50
The failures such as short circuit, overload, electric leakage and the insulation breakdown that late-class circuit or electrical equipment can occur are protected.
The utility model embodiment additionally provides a kind of electronic equipment.Fig. 7 is one kind provided by the embodiment of the utility model
The structural schematic diagram of electronic equipment.Referring to Fig. 7, which includes at least one as the utility model any embodiment mentions
The protection circuit of confession.Such as the electronic equipment can be automotive electronics, communication, new energy, security protection, consumer electronics, industrial electronic
Or computer, navigator or camera in the devices such as medical electronics etc..
The of series connection is arranged in electronic equipment provided by the embodiment of the utility model in the first branch of protection circuit
One protection location and the first boosting unit are connected in parallel the first open failure type device, the first protection at the both ends of the first branch
Unit is used for overcurrent and/or earth leakage protective, and the first boosting unit is used for the curent change in response to the first branch and boosts.With it is existing
Technology is compared, and the utility model embodiment can effectively distinguish working frequency overcurrent and lightning surge overcurrent, it is ensured that protection
For circuit under normal operating conditions and working frequency overcurrent protection state, the first protection location executes normal operation, and
In the case where the transient over-current that lightning stroke or surge generate, the first protection location will not be malfunctioned, late-class circuit can be supplied normally
Electricity, and on this basis, the first open failure type device can realize open failure function, avoid the route once damaging
Short circuit conducting, further improves the protective performance of protection circuit, is conducive to product safety certification.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (10)
1. a kind of protection circuit characterized by comprising
The first branch, the first branch include the first protection location and the first boosting unit being connected in series, and described first protects
Protect unit be used for overcurrent and/or earth leakage protective, first boosting unit be used for respond the first branch curent change and
Boosting；
First open failure type device, is connected in parallel in the both ends of the first branch.
2. protection circuit according to claim 1, which is characterized in that the inductance value of first boosting unit makes in institute
State that protection circuit is struck by lightning or when surge current, the voltage at the first open failure type device both ends is higher than its operation voltage, and
Shunting in the first branch is lower than the action current of first protection location.
3. protection circuit according to claim 1, which is characterized in that the inductance value of first boosting unit makes in institute
When stating the late-class circuit overload of protection circuit, the voltage at the first open failure type device both ends is lower than its operation voltage, and
Shunting in the first branch is higher than the action current of first protection location.
4. protection circuit according to claim 1, which is characterized in that first boosting unit includes protecting with described first
Protect the differential mode inductance that unit is connected in series.
5. protection circuit according to claim 1, which is characterized in that first protection location includes and described first liter
At least one of air-break circuit-breaker, fuse or the earth leakage circuit-breaker for pressing unit to be connected in series.
6. protection circuit according to claim 1, which is characterized in that further include second branch；
First boosting unit includes the first coil of common mode inductance, and the first coil of the common mode inductance and described first protect
Unit is protected to be connected in series；The second branch includes the second boosting unit, and second boosting unit includes the common mode inductance
The second coil, the second coil of the common mode inductance is connected in series in the both ends of the second branch.
7. protection circuit according to claim 6, which is characterized in that it further include the second protection location, second protection
Unit and second boosting unit are connected in series.
8. protection circuit according to claim 6 or 7, which is characterized in that it further include the second open failure type device, it is described
Second open failure type device is connected in parallel in the both ends of the second branch.
9. protection circuit according to claim 1, which is characterized in that the first branch be high-voltage alternating power supply line,
High voltage direct current power supply line, low-voltage alternating-current power supply line, low-voltage DC supply route or signal line one kind.
10. a kind of electronic equipment, which is characterized in that the electronic equipment includes at least one such as any one of claim 1-9 institute
The protection circuit stated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821891271.0U CN208890344U (en) | 2018-11-16 | 2018-11-16 | A kind of protection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821891271.0U CN208890344U (en) | 2018-11-16 | 2018-11-16 | A kind of protection circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN208890344U true CN208890344U (en) | 2019-05-21 |
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ID=66518276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201821891271.0U Active CN208890344U (en) | 2018-11-16 | 2018-11-16 | A kind of protection circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217238A (en) * | 2018-11-16 | 2019-01-15 | 深圳市槟城电子有限公司 | A kind of protection circuit and electronic equipment |
-
2018
- 2018-11-16 CN CN201821891271.0U patent/CN208890344U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217238A (en) * | 2018-11-16 | 2019-01-15 | 深圳市槟城电子有限公司 | A kind of protection circuit and electronic equipment |
| CN109217238B (en) * | 2018-11-16 | 2024-04-12 | 深圳市槟城电子股份有限公司 | Protection circuit and electronic equipment |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A protection circuit and electronic equipment Effective date of registration: 20201229 Granted publication date: 20190521 Pledgee: Shenzhen hi tech investment small loan Co.,Ltd. Pledgor: Shenzhen Bencent Electronics Co.,Ltd. Registration number: Y2020980010090 |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518116 Shenzhen, Longgang, Guangdong province Longgang Street Baolong community Baolong four road 3 Lan Pu Yuan Industrial Zone 1 Factory A501 Patentee after: Shenzhen Penang Electronics Co.,Ltd. Address before: 518116 Shenzhen, Longgang, Guangdong province Longgang Street Baolong community Baolong four road 3 Lan Pu Yuan Industrial Zone 1 Factory A501 Patentee before: Shenzhen Bencent Electronics Co.,Ltd. |
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| PM01 | Change of the registration of the contract for pledge of patent right | ||
| PM01 | Change of the registration of the contract for pledge of patent right |
Change date: 20220429 Registration number: Y2020980010090 Pledgor after: Shenzhen Penang Electronics Co.,Ltd. Pledgor before: Shenzhen Bencent Electronics Co.,Ltd. |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220505 Granted publication date: 20190521 Pledgee: Shenzhen hi tech investment small loan Co.,Ltd. Pledgor: Shenzhen Penang Electronics Co.,Ltd. Registration number: Y2020980010090 |