CN201733087U - Protection circuit and protection system of direct current (DC) port - Google Patents
Protection circuit and protection system of direct current (DC) port Download PDFInfo
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- CN201733087U CN201733087U CN2010202204104U CN201020220410U CN201733087U CN 201733087 U CN201733087 U CN 201733087U CN 2010202204104 U CN2010202204104 U CN 2010202204104U CN 201020220410 U CN201020220410 U CN 201020220410U CN 201733087 U CN201733087 U CN 201733087U
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Abstract
The utility model discloses a protection circuit of a direct current (DC) port, which belongs to the technical field of safety protection. The protection circuit of the DC port is connected with a protected circuit in parallel and comprises a first protection device and a capacitor which are connected in series, wherein the capacitor is connected with a second protection device in parallel, the clamping voltage of the first protection device is lower than the limiting voltage of the protected circuit, and the actuating voltage of the second protection device is lower than the difference value of the limiting voltage of the protected circuit and the clamping voltage of the first protection device. By connecting the second protection device at two ends of the capacitor in parallel, the capacitor can release charge instead of being fully charged when continuous surge voltage at the DC port is higher than that of the second protective device, thereby improving the protection capacity of the protection circuit to the continuous surge.
Description
Technical field
The utility model relates to the safety protection technique field, particularly a kind of protection circuit of DC port and guard system.
Background technology
For plate level, secondary circuit, circuit perception or capacitive load can produce surge or the concussion that is higher than operating voltage, and when long line transmitted, circuit was coupled to the surge that operating voltage can appear being higher than in the induction thunder, therefore need protect plate level, secondary circuit DC port.
Prior art generally uses protective device to suppress the surge or the concussion of circuit perception or capacitive load generation in protection circuit, be coupled to the surge that is higher than operating voltage that perceptual thunder occurs with the inhibition circuit, as TVS (Transient Voltage Suppressor, Transient Voltage Suppressor) device, TSS (Thyristor SurgeSuppressor, surge suppresses thyristor) device, piezo-resistance etc.For connecting the protection circuit of protected circuit, protective device TVS connects with capacitor C as Fig. 1, and during the circuit operate as normal, protective device TVS is in cut-off state.When occurring instantaneous surge in the circuit, TVS is oppositely pressurization under the effect of surge voltage, and the voltage of TVS two inter-stages is increased to operation voltage, and TVS is switched on the formation low-resistance, produces very big electric current.Big electric current protects by protection circuit, realizes that TVS suppresses surge, protective circuit.The capacitor C of protective device TVS of connecting simultaneously begins charging, the process that capacitance voltage promotes, and the voltage of protective device TVS two inter-stages constantly descends, and when being reduced under the operation voltage, protective device TVS ends.
In realizing process of the present utility model, the inventor finds that there is following problem at least in prior art: the protection circuit of prior art, owing to be in high-impedance state after protective device TVS ends, and the series capacitance charge stored can't bleed off, cause electric capacity to be in full pressure for a long time, the surge overvoltage is added in the electric capacity two ends, when DC port occurs being higher than the surge of operating voltage continuously, protective device TVS is not easy to reach its operation voltage and can't moves, and does not have the effect of protection circuit.
The utility model content
In order to solve the technical problem a little less than the continuous surge protective capacities that protection circuit in the prior art occurs DC port, the utility model embodiment provides a kind of protection circuit and guard system of DC port.The technical scheme of the protection circuit of described DC port is as follows:
A kind of protection circuit of DC port; described protection circuit protected circuit in parallel; first protective device and the electric capacity that comprise series connection; described electric capacity two ends second protective device in parallel; the strangulation voltage of described first protective device is less than the limiting voltage of protected circuit, and the operation voltage of described second protective device is less than the difference of the strangulation voltage of the limiting voltage of protected circuit and first protective device.
The utility model embodiment provides a kind of guard system simultaneously, comprises the protection circuit of protected circuit and above-mentioned arbitrary described DC port, described protection circuit protected circuit in parallel.
The beneficial effect that the technical scheme that the utility model embodiment provides is brought is: by the protective device in parallel at the electric capacity two ends, when continuous surge overvoltage is arranged in the circuit, electric capacity constantly discharges and recharges, and electric capacity can not be filled, thereby has promoted the protective capacities of protection circuit to continuous surge.
Description of drawings
Fig. 1 is the protection circuit schematic diagram that the utility model prior art provides;
Fig. 2 is the protection circuit schematic diagram that provides among the utility model embodiment 1;
Fig. 3 is the protection circuit schematic diagram that provides among the utility model embodiment 2.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, the utility model execution mode is described in further detail below in conjunction with accompanying drawing.
Embodiment 1
The protection circuit schematic diagram that provides among the utility model embodiment 1 as shown in Figure 2; a kind of protection circuit of DC port; this protection circuit is in parallel with protected circuit, and this protection circuit comprises first protective device and the electric capacity of series connection, described electric capacity two ends second protective device in parallel.
When occurring instantaneous surge overvoltage in the circuit; because capacitance voltage can't transition; the surge overvoltage is increased to the first protective device two-stage gradually; when the voltage of first protective device, two inter-stages surpasses operation voltage; the first protective device conducting; first protective device becomes Low ESR to the resistance value of two inter-stages by high impedance with high speed; absorb an instantaneous large-current; thereby in maximum clamping voltage, protection protected circuit in parallel is not subjected to the impact of high voltage transient spike the first protective device two-stage voltage clamping.The first protective device conducting forms very big electric current, and to the electric capacity charging of series connection, capacitance voltage can not suddenly change, and capacitance voltage increases gradually.Because electric capacity two ends second protective device in parallel, when capacitance voltage surpassed the operation voltage of second protective device, second protective device will conducting, and the electric charge bleed off that electric capacity is unnecessary falls, and therefore, electric capacity can not be in full pressure condition for a long time among the utility model embodiment.After transient pulse finished, first protective device returned to cut-off state gradually, the entire circuit operate as normal.When occurring continuous surge in the circuit, because the electric capacity both end voltage can not be filled, the voltage of first protective device, two interpolars is increased to operation voltage easily and moves, and plays the effect of protection circuit, has promoted the protective capacities of protection circuit to continuous surge.
Embodiment 2
The protection circuit schematic diagram that provides among the utility model embodiment 2 as shown in Figure 3, first protective device and second protective device are the TVS pipe with operate time of being exceedingly fast and quite high surge absorbability among the utility model embodiment, first protective device is TVS pipe T1, and second protective device is TVS pipe T2.
When the high energy impact events of moment is stood at the two ends of TVS pipe; it can become Low ESR to the resistance value between two ends by high impedance with high speed; to absorb an instantaneous large-current; in maximum clamping voltage, the protected circuit of protection connection TVS pipe is not subjected to the impact of high voltage transient spike its both end voltage strangulation.
The utility model embodiment selects to realize the T1 of cocurrent flow effect, that is to say the strangulation voltage that the requires T1 limiting voltage less than protected circuit; Operation voltage to T1 does not require, and the operation voltage of T1 can be less than by the operating voltage of protection circuit, can be greater than by the operating voltage of protection circuit yet.
The utility model embodiment selects to realize the T2 of capacitor charge and discharge ability, and the operation voltage that just requires T2 is less than the difference of the strangulation voltage of the limiting voltage of whole protected circuit and T1.
As a kind of preferred version, the operation voltage of T2 can be much smaller than the difference of the strangulation voltage of the limiting voltage of protected circuit and T1.Like this, capacitance voltage is very easy to reach the operation voltage of T2, the T2 conducting, and electric charge bleed off that can electric capacity is unnecessary falls, and electric capacity constantly discharges and recharges, and can not be filled.Can select the protective device of T2 operation voltage in the reality less than the T1 operation voltage.
The utility model embodiment is provided with the operate time of the operate time of T2 greater than T1.That is to say that the T1 two ends add that surge voltage arrives the time of the complete conducting of T1, add the time of voltage to the complete conducting of T2 greater than the T2 two ends.Be set the operate time of the operate time of T2 greater than T1, can be when surge being occurred by the protection circuit two ends, T1 moves and after conducting a period of time, the second protective device T2 is action and conducting gradually again, the electric charge of bleed off electric capacity.
The utility model embodiment supposes that the operating voltage of circuit is chosen as 5V, and selecting the operate time of T1 is 2ns, and operation voltage is 1.8V; The rated voltage of C is 6.3V, and time delay is 5ns; The utility model embodiment is 10ns to select operate time, and operation voltage is that the second protective device T2 of 1.2V describes.
When momentary pulse occurring in the circuit, because the voltage of capacitor C can not transition, overvoltage is added on the T1 gradually, and after the T1 conducting, to the capacitor C charging, capacitance voltage increases gradually.Through several ns, be increased to when capacitance voltage on the operation voltage of T2, promptly the voltage of T2 two inter-stages surpasses operation voltage, and the disposable bleed off of the electric charge of C is fallen in the T2 conducting, makes C go up voltage and reduces to about 0 volt.In this case, the operation voltage of T1 has not been required, low more good more, as long as the cocurrent flow ability is enough.And for T2; because the purpose of T2 is in order to allow C bleed off electric charge in parallel; the operation voltage that requires T2 is less than the difference of the strangulation voltage of the limiting voltage of protected circuit and T1; if the operation voltage of T2 is greater than this difference; then the voltage of T2 two interpolars can not surpass operation voltage and conducting, also just can not allow capacitor C bleed off electric charge in parallel.The operation voltage of T2 is low more, the easy more in the short period of time operation voltage that surpasses T2 of C, and with the T2 conducting, the easy more bleed off electric charge of C.That is to say that when circuit has continuous surge overvoltage C reaches the operation voltage of T2 and the bleed off electric charge easily.C in the circuit of the utility model embodiment has promoted the protective capacities of protection circuit to continuous surge owing to constantly do not discharge and recharge and can be filled.
The protective device of the utility model embodiment can also be TSS device or piezo-resistance, and circuit is board-level circuit or secondary circuit.
The utility model embodiment can also be provided with second protective device inductance of connecting, and in parallel with electric capacity, described inductance is used to delay the operate time of second this branch road of protective device.
The parallel connection of arbitrary described DC port protection circuit then can constitute a guard system among protected circuit and above-mentioned utility model embodiment 1 or the utility model embodiment 2.
The above only is preferred embodiment of the present utility model, and is in order to restriction the utility model, not all within spirit of the present utility model and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (7)
1. the protection circuit of a DC port; it is characterized in that; first protective device and the electric capacity that comprise series connection, described electric capacity two ends second protective device in parallel, the operation voltage of described second protective device is less than the difference of the strangulation voltage of the limiting voltage of protected circuit and first protective device.
2. the protection circuit of a kind of DC port as claimed in claim 1 or 2 is characterized in that, the operate time of described second protective device is greater than the operate time of first protective device.
3. the protection circuit of a kind of DC port as claimed in claim 1 or 2 is characterized in that, described second protective device inductance of connecting is in parallel with described electric capacity.
4. the protection circuit of a kind of DC port as claimed in claim 1 is characterized in that, described first protective device and/or second protective device are TVS device, TSS device or piezo-resistance.
5. the protection circuit of a kind of DC port as claimed in claim 1 is characterized in that, described circuit is board-level circuit or secondary circuit.
6. the protection circuit of a kind of DC port as claimed in claim 1 is characterized in that, the strangulation voltage of described first protective device is less than the limiting voltage of protected circuit.
7. guard system comprises protected circuit and as the protection circuit of the arbitrary described DC port of claim 1-6, described protection circuit protected circuit in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202204104U CN201733087U (en) | 2010-06-07 | 2010-06-07 | Protection circuit and protection system of direct current (DC) port |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202204104U CN201733087U (en) | 2010-06-07 | 2010-06-07 | Protection circuit and protection system of direct current (DC) port |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201733087U true CN201733087U (en) | 2011-02-02 |
Family
ID=43524243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202204104U Expired - Lifetime CN201733087U (en) | 2010-06-07 | 2010-06-07 | Protection circuit and protection system of direct current (DC) port |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201733087U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108808649A (en) * | 2018-08-31 | 2018-11-13 | 茂硕科技有限公司 | A kind of surging protection circuit |
| CN109274279A (en) * | 2017-07-17 | 2019-01-25 | 台达电子工业股份有限公司 | Power supply unit |
| CN114744602A (en) * | 2022-04-15 | 2022-07-12 | 华为技术有限公司 | Protection circuit and terminal equipment |
-
2010
- 2010-06-07 CN CN2010202204104U patent/CN201733087U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109274279A (en) * | 2017-07-17 | 2019-01-25 | 台达电子工业股份有限公司 | Power supply unit |
| US10498222B2 (en) | 2017-07-17 | 2019-12-03 | Delta Electronics, Inc. | Power supply |
| CN108808649A (en) * | 2018-08-31 | 2018-11-13 | 茂硕科技有限公司 | A kind of surging protection circuit |
| CN114744602A (en) * | 2022-04-15 | 2022-07-12 | 华为技术有限公司 | Protection circuit and terminal equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518129 Building 2, B District, Bantian HUAWEI base, Longgang District, Shenzhen, Guangdong. Patentee after: Huawei terminal (Shenzhen) Co.,Ltd. Address before: 518129 Building 2, B District, Bantian HUAWEI base, Longgang District, Shenzhen, Guangdong. Patentee before: HUAWEI DEVICE Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181221 Address after: 523808 Southern Factory Building (Phase I) Project B2 Production Plant-5, New Town Avenue, Songshan Lake High-tech Industrial Development Zone, Dongguan City, Guangdong Province Patentee after: HUAWEI DEVICE Co.,Ltd. Address before: 518129 Building 2, B District, Bantian HUAWEI base, Longgang District, Shenzhen, Guangdong. Patentee before: Huawei terminal (Shenzhen) Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110202 |
|
| CX01 | Expiry of patent term |