CN109473958B - Lightning protection circuit and electrical equipment - Google Patents
Lightning protection circuit and electrical equipment Download PDFInfo
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- CN109473958B CN109473958B CN201710804896.2A CN201710804896A CN109473958B CN 109473958 B CN109473958 B CN 109473958B CN 201710804896 A CN201710804896 A CN 201710804896A CN 109473958 B CN109473958 B CN 109473958B
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- 238000007599 discharging Methods 0.000 claims abstract description 69
- 208000025274 Lightning injury Diseases 0.000 claims abstract description 60
- 208000028659 discharge Diseases 0.000 claims abstract description 57
- 238000001914 filtration Methods 0.000 claims abstract description 23
- 238000002955 isolation Methods 0.000 claims abstract description 17
- 230000001629 suppression Effects 0.000 claims description 16
- 239000003990 capacitor Substances 0.000 claims description 15
- 239000011521 glass Substances 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 12
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 claims description 9
- 230000001052 transient effect Effects 0.000 claims description 9
- 230000015556 catabolic process Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 230000005764 inhibitory process Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000036039 immunity Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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Abstract
The embodiment of the invention discloses a lightning protection circuit and electrical equipment. The lightning protection circuit comprises a primary discharging module, a secondary discharging module and a tertiary discharging module, wherein the primary discharging module, the secondary discharging module and the tertiary discharging module are sequentially connected in series between the cable input end and the chip of the electrical equipment; when the input cable of the electrical equipment encounters lightning stroke, three-level rapid discharge treatment is carried out on the lightning stroke energy transmitted by the input end of the cable, and filtering treatment and out-of-band inhibition treatment are carried out on the transmitted cable signal, so that the response speed to the lightning stroke is high, the isolation degree is good, the protection effect is good, the anti-interference capability is strong, and the lightning stroke protection capability and the anti-interference capability of the electrical equipment such as a set top box and a television are improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of lightning protection, in particular to a lightning protection circuit and electrical equipment.
Background
With the development of information society, more and more families begin to use cable digital set-top boxes of standards such as DVB-S, DVB-T and DVB-C.
The cable often needs to be pulled from the outside to the inside, the cable exposed outside is often disturbed by lightning stroke in nature, and high energy generated by the lightning stroke is led into the digital set top box through the cable, so that a Tuner (Tuner) chip and a Tuner (LNB) power supply driving control chip of the set top box are directly damaged, and the digital set top box needs to be reworked or replaced, thereby bringing heavy burden and extremely high maintenance cost to the technical support and maintenance after the operator or equipment manufacturer of the digital set top box. How to improve the lightning-proof and disturbance-proof capability of the digital set top box product is a difficult problem which is not overcome by the research in the industry.
As shown in fig. 1, it is currently common practice in the industry to: a high-voltage isolation capacitor C1 is arranged between the cable input end of the digital set top box and the input end of the tuner chip to protect the tuner chip; and an inductor L and a filter capacitor C2 are added at the cable input end of the digital set top box and the input end of the tuner power supply driving control chip so as to protect the tuner power supply driving control chip. The digital set top box adopting the method has the lightning protection voltage range of (+/-) (1-2) KV, the out-of-band interference rejection ratio of about-10 dB, low response speed to lightning stroke, poor isolation, low protection level and poor protection effect.
Disclosure of Invention
In order to solve the related technical problems, the embodiment of the invention provides a lightning protection circuit and electrical equipment, which are used for improving the lightning stroke protection capability and the anti-interference capability of the electrical equipment such as a top box, a television and the like.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a lightning protection circuit, including: the device comprises a first-stage discharge module, a second-stage discharge module and a third-stage discharge module;
the first-stage discharging module is respectively connected with the cable input end and the second-stage discharging module and is used for accessing the cable signal and the lightning stroke energy which are transmitted by the cable input end, releasing the lightning stroke energy and outputting the cable signal and the residual lightning stroke energy to the second-stage discharging module;
the secondary discharging module is further connected with the tertiary discharging module and is used for performing filtering treatment and out-of-band suppression treatment on the cable signal, releasing the residual lightning stroke energy and outputting the cable signal and the tail end lightning stroke energy to the tertiary discharging module;
the three-stage discharging module is also connected with a chip of the electrical equipment and used for isolating and releasing the lightning stroke energy of the tail end and transmitting the cable signal to the chip of the electrical equipment.
Preferably, the secondary discharge module comprises a filter unit and a secondary discharge unit;
the filtering unit is respectively connected with the primary discharging module and the tertiary discharging module and is used for performing filtering treatment and out-of-band inhibition treatment on the cable signal and outputting the cable signal and tail end lightning stroke energy to the tertiary discharging module;
and the secondary discharging unit is respectively connected with the primary discharging module and the tertiary discharging module and is used for releasing the residual lightning stroke energy and outputting the tail end lightning stroke energy to the tertiary discharging module.
Preferably, the three-stage discharging module comprises a three-stage discharging unit and an isolating unit, and the chip comprises a tuner chip and a tuner power supply driving control chip;
the three-stage discharging unit is respectively connected with the filtering unit and the tuner chip and is used for releasing the lightning stroke energy of the tail end and transmitting the cable signal to the tuner chip;
the isolation unit is respectively connected with the secondary discharge unit and the tuner power supply driving control chip and is used for isolating lightning current and transmitting the cable signal to the tuner power supply driving control chip.
Preferably, the filtering unit comprises a band-pass filter B, and the secondary discharging unit comprises a magneto-oxide inductor L1, a high-frequency capacitor C and a first diode D1; one end of the band-pass filter B is connected with the primary discharge module, and the other end of the band-pass filter B is connected with the tertiary discharge module; one end of the magnetic oxide body inductor L1 is connected with the primary discharge module, the other end of the magnetic oxide body inductor L1 is respectively connected with one end of the high-frequency capacitor C and the negative electrode of the first diode D1, the other end of the high-frequency capacitor is grounded, and the positive electrode of the first diode D1 is grounded.
Preferably, the upper limit frequency of the band-pass filter B is 2.15GHz, and the lower limit frequency is 950MHz; the inductance value range of the magnetic oxide inductor L1 is 100-400 nH, and the quality factor Q is more than 30; the capacitance value of the high-frequency capacitor C is 100pF; the first diode D1 is a transient suppression diode, and the power of the diode D1 is 3KW.
Preferably, the three-stage discharge unit includes a second diode D2, and the isolation unit includes a third diode D3; the cathode of the second diode D2 is respectively connected with the filter unit and the tuner chip, and the anode of the second diode D2 is grounded; and the negative electrode of the third diode D3 is connected with the secondary discharge unit, and the positive electrode of the third diode D3 is connected with the tuner power supply driving control chip.
Preferably, the second diode D2 is a transient suppression diode, and the breakdown voltage of D2 is 5V; the reverse voltage of the third diode D3 is 40V, and the forward current is 2A.
Preferably, the primary discharge module comprises a glass discharge tube A; one end of the glass discharge tube A is respectively connected with the cable input end and the secondary discharge module, and the other end of the glass discharge tube A is grounded; the nominal pulse withstand voltage capacity of the glass discharge tube A is 10/700us6KV.
In a second aspect, an embodiment of the present invention provides an electrical apparatus, including a lightning protection circuit provided by any one of the embodiments of the present invention.
Preferably, the electrical equipment is a set top box or a television.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
the embodiment of the invention provides a lightning protection circuit and electrical equipment, wherein the lightning protection circuit comprises a primary discharging module, a secondary discharging module and a tertiary discharging module, wherein the primary discharging module, the secondary discharging module and the tertiary discharging module are sequentially connected in series between a cable input end and a chip of the electrical equipment, when a cable is struck by lightning, the cable input end is transmitted with a cable signal and lightning strike energy, the primary discharging module rapidly and stably absorbs and releases most of the lightning strike energy, outputs the cable signal and residual lightning strike energy to the secondary discharging module, the secondary discharging module carries out filtering treatment and out-of-band inhibition treatment on the cable signal, releases the residual lightning strike energy, outputs the cable signal and terminal lightning strike energy to the tertiary discharging module, and the tertiary discharging module isolates and releases the terminal lightning strike energy to transmit the cable signal to the chip of the electrical equipment; the lightning stroke energy transmitted by the cable input end is subjected to three-stage rapid discharge treatment, and the transmitted cable signal is subjected to filtering treatment and out-of-band inhibition treatment, so that the lightning stroke energy-saving device has the advantages of high response speed, good isolation, good protection effect and strong anti-interference capability on lightning strokes, and the lightning stroke protection capability and the anti-interference capability of electrical equipment such as a set top box and a television are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic illustration of a lightning protection scheme for an electrical device in the prior art;
FIG. 2 is a schematic diagram of an application scenario of a lightning protection circuit in an embodiment of the present invention;
FIG. 3 is a block diagram of a lightning protection circuit according to an embodiment of the present invention;
FIG. 4 is a block diagram of a lightning protection circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a lightning protection circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electrical device according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In order to improve lightning protection capability and anti-interference capability of electrical equipment such as a set top box and a television, the embodiment of the invention provides a lightning protection circuit, which is applied to the electrical equipment such as the set top box and the television, and particularly can be applied to a satellite receiving cable set top box, a terrestrial antenna receiving cable set top box or a set top box in an EOC (Ethernet Over Cable, ethernet cable) and CMTS (Cable Modem Terminal Systems, cable modem terminal system) environment as shown in figure 2.
As shown in fig. 3, a lightning protection circuit provided in an embodiment of the present invention includes: a primary discharge module 10, a secondary discharge module 20, and a tertiary discharge module 30.
The primary discharging module 10 is connected with the cable input end and the secondary discharging module 20 respectively, and is used for accessing the cable signal and the lightning stroke energy which are transmitted by the cable input end, releasing the lightning stroke energy and outputting the cable signal and the residual lightning stroke energy to the secondary discharging module 20.
The secondary discharging module 20 is further connected to the tertiary discharging module 30, and is configured to perform filtering processing and out-of-band suppression processing on the cable signal, release residual lightning stroke energy, and output the cable signal and the terminal lightning stroke energy to the tertiary discharging module 30.
The three-stage discharging module 30 is also connected with the chip of the electrical equipment and is used for isolating and releasing the end lightning stroke energy and transmitting cable signals to the chip of the electrical equipment.
In one embodiment, the electrical device is preferably a set-top box, which is connected to the satellite receiver by a cable exposed outdoors, the cable signal being a satellite television signal. When the set-top box works, the satellite receiver inputs satellite television signals (weak current) to the set-top box through a cable input end of the set-top box, and the set-top box provides working voltage for the satellite receiver through a cable. When thunderstorm weather occurs, the lightning stroke energy and satellite television signals are transmitted to the set top box through the cable input end together when the cable is struck by lightning, and the lightning stroke energy of a part is quickly released by the first-stage discharging module 10 in the lightning protection circuit provided by the embodiment, and a small part of residual lightning stroke energy is remained; residual lightning stroke energy is quickly released through the secondary discharging module 20, a very small amount of tail end lightning stroke energy is remained, and filtering processing and out-of-band suppression processing are carried out on satellite television signals; the three-stage discharging module 30 is used for isolating and rapidly releasing the lightning stroke energy of the tail end, and transmitting satellite television signals to the tuner chip and the tuner power supply driving control chip of the set top box, so that the normal operation of the set top box is ensured, and the set top box is not interfered and influenced by lightning strokes.
In summary, in the technical solution of the present embodiment, when the access cable of the electrical apparatus encounters a lightning strike, the cable input end is input with a cable signal and lightning strike energy, the primary discharge module 10 rapidly and stably absorbs and releases most of the lightning strike energy, outputs the cable signal and residual lightning strike energy to the secondary discharge module 20, the secondary discharge module 20 performs filtering processing and out-of-band suppression processing on the cable signal, releases the residual lightning strike energy, outputs the cable signal and terminal lightning strike energy to the tertiary discharge module 30, and the tertiary discharge module 30 isolates and releases the terminal lightning strike energy, and transmits the cable signal to the chip of the electrical apparatus; the lightning stroke energy transmitted by the cable input end is subjected to three-stage rapid discharge treatment, and the transmitted cable signal is subjected to filtering treatment and out-of-band inhibition treatment, so that the lightning stroke energy-saving device has the advantages of high response speed, good isolation, good protection effect and strong anti-interference capability on lightning strokes, and the lightning stroke protection capability and the anti-interference capability of electrical equipment such as a set top box and a television are improved.
As shown in fig. 4 and 5, the primary discharge module 10 may alternatively include a glass discharge tube a; further, one end of the glass discharge tube A is respectively connected with the cable input end and the secondary discharge module 20, and the other end is grounded; the nominal pulse withstand voltage capacity of the glass discharge vessel A was 10/700us6KV.
In the embodiment, most of lightning stroke energy can be quickly and stably absorbed and released through the glass discharge tube A, wherein the glass discharge tube A has the advantages of strong surge current resistance, high response speed (nanosecond level), impact resistance, stable performance, good repeatability, long service life and the like. Although the response speed of the glass discharge tube a is fast, a certain response speed and time threshold are required, so that after the glass discharge tube a is discharged, a part of residual voltage is inevitably left, that is, residual lightning stroke energy and a cable signal are output to the secondary discharge module 20 together.
Optionally, the secondary discharge module 20 includes a filter unit 21 and a secondary discharge unit 22.
The filtering unit 21 is connected with the primary discharging module 10 and the tertiary discharging module 30 respectively, and is used for performing filtering processing and out-of-band suppression processing on the cable signal, and outputting the cable signal and the tail lightning stroke energy to the tertiary discharging module 30.
The secondary discharge unit 22 is connected to the primary discharge module 10 and the tertiary discharge module 30, and is used for releasing residual lightning strike energy and outputting terminal lightning strike energy to the tertiary discharge module 30.
Further, the filtering unit 21 includes a band-pass filter B, and the secondary discharging unit 22 includes a magneto-oxide inductor L1, a high-frequency capacitor C, and a first diode D1; one end of the band-pass filter B is connected with the primary discharge module 10, and the other end of the band-pass filter B is connected with the tertiary discharge module 30; one end of the magnetic oxygen body inductor L1 is connected with the primary discharge module 10, the other end of the magnetic oxygen body inductor L1 is respectively connected with one end of the high-frequency capacitor C and the cathode of the first diode D1, the other end of the high-frequency capacitor is grounded, and the anode of the first diode D1 is grounded.
Further, the upper limit frequency of the band-pass filter B is 2.15GHz, and the lower limit frequency is 950MHz; the inductance value range of the magnetic oxide inductor L1 is 100-400 nH, and the quality factor Q is more than 30; the capacitance value of the high-frequency capacitor C is 100pF; the first diode D1 is a transient suppression diode, and the power of D1 is 3KW.
In one embodiment, the magnetic oxygen body inductor L1 is made of copper wire wound on a magnetic oxygen body; the band-pass filter B is a multistage separation combined filter, the specific stage number depends on the specific application scenario, the band-pass frequency of the band-pass filter B depends on the standard adopted by the electrical equipment, the electrical equipment provided by the embodiment adopts the DVB-S standard, the band-pass frequency of the corresponding band-pass filter B is 950 MHz-2.15 GHz, and in other embodiments, the specific standard adopts the corresponding band-pass frequency, for example, for the electrical equipment adopting the DVB-C standard, the band-pass frequency of the band-pass filter B is 88 MHz-1002 MHz.
The band-pass filter B of the filtering unit 21 can filter out the invalid signals outside the band-pass frequency band, but because the lightning energy signal is irregular in the moment, it is possible that a small part of the frequency of the lightning energy signal falls in the band-pass frequency band and is not filtered out by the band-pass filter B, so that the signal passing through the band-pass filter B needs to be subjected to multi-stage attenuation through a multi-stage separation combination design, that is, the signal passing through the band-pass filter B is subjected to out-of-band rejection processing. The magnetic oxide inductor L1 of the secondary discharge unit 22 is used for preventing the current in the circuit from changing, the first diode D1 adopts a transient suppression diode (TVS), and the transient suppression diode has the characteristics of high response speed (subnanosecond level) and strong surge absorption capability, and the combination of the magnetic oxide inductor L1, the high-frequency capacitor C and the first diode D1 in the secondary discharge unit 22 can quickly release residual lightning stroke energy.
Alternatively, the three-stage discharge module 30 includes a three-stage discharge unit 31 and an isolation unit 32, and the chips include a tuner chip and a tuner power supply drive control chip.
And a three-stage discharging unit 31 connected to the filtering unit 21 and the tuner chip, respectively, for discharging the end lightning strike energy and transmitting the cable signal to the tuner chip.
And the isolation unit 32 is respectively connected with the secondary discharge unit 22 and the tuner power supply driving control chip and is used for isolating lightning current and transmitting cable signals to the tuner power supply driving control chip.
Further, the three-stage discharge unit 31 includes a second diode D2, and the isolation unit 32 includes a third diode D3; the cathode of the second diode D2 is respectively connected with the filter unit 21 and the tuner chip, and the anode is grounded; the negative electrode of the third diode D3 is connected with the secondary discharge unit 22, and the positive electrode is connected with the tuner power supply driving control chip.
Further, the second diode D2 is a transient suppression diode, and the breakdown voltage of D2 is 5V; the reverse voltage of the third diode D3 is 40V and the forward current is 2A.
In one embodiment, although lightning stroke energy is processed by the primary discharge module 10 and the secondary discharge module 20, only negligible weak energy, i.e., end lightning stroke energy, remains, since the tuner chip and the tuner power supply driving control chip of the electrical device are very sensitive to external abnormal energy (end lightning stroke energy), in order to better protect the tuner chip and the tuner power supply driving control chip and to improve the immunity of the electrical device, a three-stage discharge unit 31 is provided before the tuner chip, and an isolation unit 32 is provided before the tuner power supply driving control chip.
The second diode D2 of the three-stage discharge unit 31 adopts a transient suppression diode, and has high response speed (subnanosecond level) and strong surge absorption capacity; the third diode D3 of the isolation unit 32 is reversely connected in series in the circuit before the tuner power driving control chip, and since the electrical equipment needs to provide the working voltage for the satellite receiver through the tuner power driving control chip and the cable input end, and meanwhile, needs to isolate the lightning stroke energy of the tail end before the tuner power driving control chip and ensure that the cable signal can be normally transmitted to the tuner power driving control chip, the third diode D3 needs to be reversely connected in series in the circuit, and the reverse saturation current of the third diode D3 needs to be larger than the weak current of the cable signal, so that the cable signal can pass through the third diode D3; in addition, the third diode D3 further enables a plurality of electrical devices (such as set top boxes) in the user's home to be cascaded or connected in parallel, for example, the set top boxes with loops can be directly cascaded, and the set top boxes without loops can be connected in parallel to share one cable headend device.
Through multiple experimental tests, the lightning protection circuit provided by the embodiment can achieve the lightning protection voltage of + -10 KV and the out-of-band interference rejection ratio of-30 dB for electrical equipment such as a set top box and a television; the lightning protection voltage range of the electrical equipment adopting the prior art scheme is (+/-) (1-2) KV, and the out-of-band interference rejection ratio is about-10 dB. Therefore, compared with the prior art, the lightning protection circuit provided by the embodiment of the invention has good isolation degree, good protection effect and strong anti-interference capability on lightning stroke.
It should be noted that, the components mentioned in the embodiments of the present invention and the parameters of the components are all preferred schemes, but not the only choices, and should not be construed as limitations of the embodiments of the present invention.
Referring to fig. 6, the embodiment of the invention further provides an electrical apparatus.
As shown in fig. 6, the electrical equipment provided by the present embodiment includes the lightning protection circuit provided by any one of the embodiments of the present invention.
Optionally, the electrical apparatus of this embodiment may further include: cable input, tuner chip, tuner power supply drive control chip, demodulator, CPU (Central Processing Unit ), decoder and HDMI (High Definition Multimedia Interface, high definition multimedia interface) output, etc.; the lightning protection circuit is respectively connected with the cable input end, the tuner chip and the tuner power supply driving control chip, the tuner chip is further connected with the demodulator, the tuner power supply driving control chip is further connected with the demodulator and the CPU, and the CPU is further connected with the demodulator, the decoder and the HDMI output end.
Preferably, the electrical device is a set-top box or a television.
The lightning protection circuit provided by any embodiment of the invention has the advantages of high response speed to lightning stroke, good isolation, good protection effect and strong anti-interference capability, and improves the lightning stroke protection capability and the anti-interference capability of the electrical equipment such as a set top box, a television and the like.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. A lightning protection circuit, comprising: the device comprises a first-stage discharge module, a second-stage discharge module and a third-stage discharge module;
the first-stage discharging module is respectively connected with the cable input end and the second-stage discharging module and is used for accessing the cable signal and the lightning stroke energy which are transmitted by the cable input end, releasing the lightning stroke energy and outputting the cable signal and the residual lightning stroke energy to the second-stage discharging module;
the secondary discharging module is further connected with the tertiary discharging module and is used for performing filtering treatment and out-of-band suppression treatment on the cable signal, releasing the residual lightning stroke energy and outputting the cable signal and the tail end lightning stroke energy to the tertiary discharging module;
the three-stage discharging module is also connected with a chip of the electrical equipment and used for isolating and releasing the lightning stroke energy of the tail end and transmitting the cable signal to the chip of the electrical equipment;
the secondary discharge module comprises a filtering unit and a secondary discharge unit;
the three-stage discharging module comprises a three-stage discharging unit and an isolating unit, wherein the chip comprises a tuner chip and a tuner power supply driving control chip;
the three-stage discharging unit is respectively connected with the filtering unit and the tuner chip and is used for releasing the lightning stroke energy of the tail end and transmitting the cable signal to the tuner chip;
the isolation unit is respectively connected with the secondary discharge unit and the tuner power supply driving control chip and is used for isolating lightning current and transmitting the cable signal to the tuner power supply driving control chip; a three-stage discharge unit is provided before the tuner chip, and an isolation unit is provided before the tuner power supply drive control chip.
2. The lightning protection circuit according to claim 1, wherein the filtering unit is connected with the primary discharging module and the tertiary discharging module respectively, and is used for performing filtering processing and out-of-band suppression processing on the cable signal, and outputting the cable signal and tail end lightning stroke energy to the tertiary discharging module;
and the secondary discharging unit is respectively connected with the primary discharging module and the tertiary discharging module and is used for releasing the residual lightning stroke energy and outputting the tail end lightning stroke energy to the tertiary discharging module.
3. The lightning protection circuit according to claim 2, wherein the filtering unit comprises a band-pass filter B, and the secondary discharging unit comprises a magneto-oxide inductor L1, a high-frequency capacitor C, and a first diode D1; one end of the band-pass filter B is connected with the primary discharge module, and the other end of the band-pass filter B is connected with the tertiary discharge module; one end of the magnetic oxide body inductor L1 is connected with the primary discharge module, the other end of the magnetic oxide body inductor L1 is respectively connected with one end of the high-frequency capacitor C and the negative electrode of the first diode D1, the other end of the high-frequency capacitor is grounded, and the positive electrode of the first diode D1 is grounded.
4. The lightning protection circuit according to claim 3, wherein the upper limit frequency of the band-pass filter B is 2.15GHz and the lower limit frequency is 950MHz; the inductance value range of the magnetic oxide inductor L1 is 100-400 nH, and the quality factor Q is more than 30; the capacitance value of the high-frequency capacitor C is 100pF; the first diode D1 is a transient suppression diode, and the power of the diode D1 is 3KW.
5. The lightning protection circuit of claim 1, wherein the three-stage discharge unit includes a second diode D2 and the isolation unit includes a third diode D3; the cathode of the second diode D2 is respectively connected with the filter unit and the tuner chip, and the anode of the second diode D2 is grounded; and the negative electrode of the third diode D3 is connected with the secondary discharge unit, and the positive electrode of the third diode D3 is connected with the tuner power supply driving control chip.
6. The lightning protection circuit of claim 5, wherein the second diode D2 is a transient suppression diode, and the breakdown voltage of D2 is 5V; the reverse voltage of the third diode D3 is 40V, and the forward current is 2A.
7. The lightning protection circuit of claim 1, wherein the primary discharge module comprises a glass discharge tube a; one end of the glass discharge tube A is respectively connected with the cable input end and the secondary discharge module, and the other end of the glass discharge tube A is grounded; the nominal pulse withstand voltage capacity of the glass discharge tube A is 10/700us6KV.
8. An electrical device comprising a lightning protection circuit according to claims 1 to 7.
9. The electrical device of claim 8, wherein the electrical device is a set top box or a television.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710804896.2A CN109473958B (en) | 2017-09-08 | 2017-09-08 | Lightning protection circuit and electrical equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710804896.2A CN109473958B (en) | 2017-09-08 | 2017-09-08 | Lightning protection circuit and electrical equipment |
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| CN109473958A CN109473958A (en) | 2019-03-15 |
| CN109473958B true CN109473958B (en) | 2023-11-21 |
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| CN111049120A (en) * | 2019-12-06 | 2020-04-21 | 北京京航计算通讯研究所 | Radio frequency front end electromagnetic pulse protection module |
| CN111030069A (en) * | 2019-12-06 | 2020-04-17 | 北京京航计算通讯研究所 | Radio frequency front end electromagnetic pulse protection method |
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