CN204290297U - A kind of power supply adaptor lightning protection circuit of Set Top Box - Google Patents
A kind of power supply adaptor lightning protection circuit of Set Top Box Download PDFInfo
- Publication number
- CN204290297U CN204290297U CN201420671825.1U CN201420671825U CN204290297U CN 204290297 U CN204290297 U CN 204290297U CN 201420671825 U CN201420671825 U CN 201420671825U CN 204290297 U CN204290297 U CN 204290297U
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- power supply
- circuit
- lightning protection
- supply adaptor
- protection circuit
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Abstract
The utility model provides a kind of power supply adaptor lightning protection circuit of Set Top Box; comprise: suppress circuit for connecting the external power supply circuit of civil power, one-level lightning protection circuit and lightning current; described external power supply circuit comprises live wire input and zero line input; described one-level lightning protection circuit is connected in parallel between external power supply circuit and lightning protection PE line, and described lightning current suppresses circuit to be arranged between one-level lightning protection circuit and the output of power supply adaptor and is connected on external power supply on power supply adaptor supply access.The utility model suppresses circuit jointly to be cut down lightning current by one-level lightning protection circuit and lightning current, improves lightning protection effect.
Description
Technical field
The utility model relates to a kind of anti-thunder technical field, particularly a kind of power supply adaptor lightning protection circuit of Set Top Box.
Background technology
Along with the scientific and technological develop rapidly of society, the audio-visual equipment of people's life & amusement also constantly updates the replacement, and the use of various electronic equipment, all be unable to do without power supply adaptor for its charging, power supply adaptor is as modern electronic product equipment, not only its performance will meet power supply unit requirement, autoprotection function also needs to improve, early stage traditional analog television progressively steps down from the stage of history, television terminal is relied on to provide the home appliance of integrated information business, make user can watch digital television program on a television set, and carry out interactive digital amusement by network, the Set Top Box of education and commercialization activity also enters each household family gradually, existing Set Top Box power supply adaptor peak load in use easily causes damage.Modal electronic equipment harm is caused by thunderbolt, because the current surge responded in power supply and communication line when thunderbolt occurs causes damage.
Utility model content
The utility model, for the technical problem of above-mentioned existence, proposes a kind of power supply adaptor lightning protection circuit of Set Top Box, solves power supply adaptor and to be in use struck by lightning or inner surge current causes the problem of the damage of power supply adaptor.
Design taked to achieve these goals is: a kind of power supply adaptor lightning protection circuit of Set Top Box; comprise: suppress circuit for connecting the external power supply circuit of civil power, one-level lightning protection circuit and lightning current; described external power supply circuit comprises live wire input and zero line input; described one-level lightning protection circuit is connected in parallel between external power supply circuit and lightning protection PE line, and described lightning current suppresses circuit to be arranged between one-level lightning protection circuit and the output of power supply adaptor and is connected on external power supply on power supply adaptor supply access.
Described one-level lightning protection circuit comprises piezo-resistance, protective tube and discharge tube FD, described live wire input to be connected protective tube, described live wire input and piezo-resistance RV1 in parallel between zero line input, by piezo-resistance RV2 and discharge tube FD series connection ground connection on described live wire input, described discharge tube FD connects with piezo-resistance RV3, and the other end of described piezo-resistance RV3 is connected to adapter circuit.
Described lightning current suppresses circuit to comprise: core inductance L1, core inductance L2, electric capacity C1, electric capacity C2 and electric capacity C3, described core inductance L1 is connected between the positive pole of external power supply and the electrode input end of Set Top Box power supply adaptor, described core inductance L2 is connected between the negative pole of external power supply and the negative input of Set Top Box power supply adaptor, the two ends of electric capacity C1 are connected in parallel between the positive pole of power supply adaptor and negative input, one end of described electric capacity C2 connects the electrode input end of power supply adaptor, the other end of described electric capacity C2 is connected to the earth terminal of one-level lightning protection circuit, and be connected with the negative input of power supply adaptor by electric capacity C3.
Described discharge tube FD adopts ceramic gas discharge tube.
Described protective tube is wire resistor R, and described wire resistor R is arranged on the live wire input of described piezo-resistance RV1 front-end circuit.
The beneficial effects of the utility model: the utility model suppresses circuit to carry out secondary lightning protection circuit by lightning current, when lightning current is introduced by external power supply, part lightning current is released into ground by one-level lightning protection circuit, another part lightning current continues transmission, lightning current suppresses circuit to form transient state high impedance for lightning current waveform, make one-level lightning protection circuit as early as possible by more lightning current energy of releasing on the one hand, lightning current can be stoped on the other hand to continue to propagate along power line, circuit is suppressed jointly to be cut down lightning current by one-level lightning protection circuit and lightning current, improve lightning protection effect.
Accompanying drawing explanation
Fig. 1 is the power supply adaptor lightning protection circuit figure of a kind of Set Top Box that the utility model proposes.
Embodiment
See Fig. 1, be the power supply adaptor lightning protection circuit figure of a kind of Set Top Box that the utility model proposes.
As shown in Figure 1; a kind of power supply adaptor lightning protection circuit of Set Top Box; comprise: suppress circuit for connecting the external power supply circuit of civil power, one-level lightning protection circuit and lightning current; described external power supply circuit comprises live wire input and zero line input; described one-level lightning protection circuit is connected in parallel between external power supply circuit and lightning protection PE line, and described lightning current suppresses circuit to be arranged between one-level lightning protection circuit and the output of power supply adaptor and is connected on external power supply on power supply adaptor supply access.
Further, described one-level lightning protection circuit comprises piezo-resistance, protective tube and discharge tube FD, described live wire input to be connected protective tube, described live wire input and piezo-resistance RV1 in parallel between zero line input, by piezo-resistance RV2 and discharge tube FD series connection ground connection on described live wire input, described discharge tube FD connects with piezo-resistance RV3, and the other end of described piezo-resistance RV3 is connected to adapter circuit.
Described lightning current suppresses circuit to comprise: core inductance L1, core inductance L2, electric capacity C1, electric capacity C2 and electric capacity C3, described core inductance L1 is connected between the positive pole of external power supply and the electrode input end of Set Top Box power supply adaptor, described core inductance L2 is connected between the negative pole of external power supply and the negative input of Set Top Box power supply adaptor, the two ends of electric capacity C1 are connected in parallel between the positive pole of power supply adaptor and negative input, one end of described electric capacity C2 connects the electrode input end of power supply adaptor, the other end of described electric capacity C2 is connected to the earth terminal of one-level lightning protection circuit, and be connected with the negative input of power supply adaptor by electric capacity C3.
The utility model is by adopting piezo-resistance and discharge tube composition parallel single-phase formula anti-lightning surge circuit; adopt 3 piezo-resistances and a discharge tube composition combined type symmetric circuit; carry out common mode, the poor full protection circuit touched; employing piezo-resistance is in parallel; extend the useful life of circuit; be separated with switching power circuit after piezo-resistance short-circuit failure, can not cause and catch fire, protection power source adapter circuit.
In the utility model embodiment, circuit is suppressed to carry out secondary lightning protection circuit by lightning current, when lightning current is introduced by external power supply, part lightning current is released into ground by one-level lightning protection circuit, another part lightning current continues transmission, now lightning current suppresses circuit to play a role, transient state high impedance is formed for lightning current waveform, make one-level lightning protection circuit as early as possible by more lightning current energy of releasing on the one hand, lightning current can be stoped on the other hand to continue to propagate along power line, circuit is suppressed jointly to be cut down lightning current by one-level lightning protection circuit and lightning current, improve lightning protection effect.
Further, described discharge tube FD adopts ceramic gas discharge tube.Thunder-strike current in circuit or surge circuit are released ground by ceramic gas discharge tube, and discharging current is large, and interelectrode capacitance is little, and insulation resistance is high, and puncture voltage is dispersed large.
Further, described protective tube is wire resistor R, and described wire resistor R is arranged on the live wire input of described piezo-resistance RV1 front-end circuit.
In the utility model embodiment, piezo-resistance RV1 front end circuit to be connected a wire-wound resistor, the front end that piezo-resistance RV1 is positioned at power adapter circuit respectively with power supply L, N parallel, mainly come clamper L, N voltage between lines, when this piezo-resistance RV1 short-circuit failure, wire-wound resistor can play the effect of fuse, is disconnected by short circuit current, piezo-resistance belongs to voltage clamp bit-type protection device, its clamp voltage point and piezo-resistance Selecting parameter relatively important; Adopt piezo-resistance and the ceramic gas discharge tube of 561k-10D in this circuit, the discharge capacity discharge capacity as requested of ceramic gas discharge tube is selected.
Further, one end of described piezo-resistance RV3 is connected with discharge tube FD, and the other end is connected by the direct voltage of electric capacity with power supply adaptor internal circuit.
In the utility model embodiment, ground connection after described piezo-resistance RV0, RV2 connect with ceramic gas discharge tube FD1, RV0 and FD1 series connection is mainly released indirect lightning strike surge current on L line, RV2 and FD1 series connection is mainly released by the energy on signal port string people 24V reference potential, when after RV0, RV2 short-circuit failure, it can be separated with power circuit by FD1, can not cause phenomenon of catching fire.
Above the utility model is described in detail, but the utility model is not limited to above-mentioned execution mode, in the ken that those of ordinary skill in the art possess, can also makes a variety of changes under the prerequisite not departing from the utility model aim.Do not depart from design of the present utility model and scope can make many other and change and remodeling.Should be appreciated that the utility model is not limited to specific execution mode, scope of the present utility model is defined by the following claims.
Claims (4)
1. the power supply adaptor lightning protection circuit of a Set Top Box, comprise: for connecting the external power supply circuit of civil power, one-level lightning protection circuit and lightning current suppress circuit, described external power supply circuit comprises live wire input and zero line input, described one-level lightning protection circuit is connected in parallel between external power supply circuit and lightning protection PE line, described lightning current suppresses circuit to be arranged between one-level lightning protection circuit and the output of power supply adaptor, and be connected on external power supply on power supply adaptor supply access, described one-level lightning protection circuit comprises piezo-resistance, protective tube and discharge tube FD, described live wire input to be connected protective tube, described live wire input and piezo-resistance RV1 in parallel between zero line input, by piezo-resistance RV2 and discharge tube FD series connection ground connection on described live wire input, described discharge tube FD connects with piezo-resistance RV3, the other end of described piezo-resistance RV3 is connected to adapter circuit.
2. the power supply adaptor lightning protection circuit of a kind of Set Top Box according to claim 1, it is characterized in that, described lightning current suppresses circuit to comprise: core inductance L1, core inductance L2, electric capacity C1, electric capacity C2 and electric capacity C3, described core inductance L1 is connected between the positive pole of external power supply and the electrode input end of Set Top Box power supply adaptor, described core inductance L2 is connected between the negative pole of external power supply and the negative input of Set Top Box power supply adaptor, the two ends of electric capacity C1 are connected in parallel between the positive pole of power supply adaptor and negative input, one end of described electric capacity C2 connects the electrode input end of power supply adaptor, the other end of described electric capacity C2 is connected to the earth terminal of one-level lightning protection circuit, and be connected with the negative input of power supply adaptor by electric capacity C3.
3. the power supply adaptor lightning protection circuit of a kind of Set Top Box according to claim 1, is characterized in that, described discharge tube FD adopts ceramic gas discharge tube.
4. the power supply adaptor lightning protection circuit of a kind of Set Top Box according to claim 1, is characterized in that, described protective tube is wire resistor R, and described wire resistor R is arranged on the live wire input of described piezo-resistance RV1 front-end circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420671825.1U CN204290297U (en) | 2014-11-12 | 2014-11-12 | A kind of power supply adaptor lightning protection circuit of Set Top Box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420671825.1U CN204290297U (en) | 2014-11-12 | 2014-11-12 | A kind of power supply adaptor lightning protection circuit of Set Top Box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204290297U true CN204290297U (en) | 2015-04-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420671825.1U Expired - Fee Related CN204290297U (en) | 2014-11-12 | 2014-11-12 | A kind of power supply adaptor lightning protection circuit of Set Top Box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204290297U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993961A (en) * | 2021-03-18 | 2021-06-18 | 东莞永胜医疗制品有限公司 | Heating circuit protection circuit, breathing heating circuit and breathing auxiliary equipment |
-
2014
- 2014-11-12 CN CN201420671825.1U patent/CN204290297U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993961A (en) * | 2021-03-18 | 2021-06-18 | 东莞永胜医疗制品有限公司 | Heating circuit protection circuit, breathing heating circuit and breathing auxiliary equipment |
| CN112993961B (en) * | 2021-03-18 | 2022-11-01 | 东莞永胜医疗制品有限公司 | Heating circuit protection circuit, breathing heating circuit and breathing auxiliary equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20171112 |