CN101976830A - Surge protection device of high-definition network video camera - Google Patents
Surge protection device of high-definition network video camera Download PDFInfo
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- CN101976830A CN101976830A CN2010105478825A CN201010547882A CN101976830A CN 101976830 A CN101976830 A CN 101976830A CN 2010105478825 A CN2010105478825 A CN 2010105478825A CN 201010547882 A CN201010547882 A CN 201010547882A CN 101976830 A CN101976830 A CN 101976830A
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Abstract
The invention relates to a surge protection device of a high-definition network video camera, belonging to the field of lightning science and technology. In the surge protection device, a power source protection part and a signal protection part are connected by a PE (Protecting Earthing) line, the power source protection part comprises a first-level longitudinal protection circuit, a decoupling element, a second-level horizontal protection circuit, a fault protection device and a fault display device; the signal protection part comprises a first-level longitudinal protection circuit, an isolating element and a second-level horizontal protection circuit. The surge protection device can limit the amplitude of lightning overvoltage within a tolerable voltage resisting range of a network video camera, protect the high-definition network video camera and guarantee the regular operation of the high-definition network video camera.
Description
Technical field
The present invention relates to a kind of surge protector of high definition web camera, belong to thunder and lightning science and technology field.
Background technology
The high definition web camera provides the information source of video monitoring, it carries out video the abbreviation of high definition coding and the English Internet Protocol of IP(, Chinese is the agreement that interconnects between the network) encapsulation, carry high-definition image by IP network, can realize functions such as high definition supervision, video recording.The image of high definition all has corresponding requirement to system configuration such as video source, encoding device, transmission switching equipment, decoding and displaying equipment, memory devices.At transmitting terminal, web camera is integrated IMAQ, video compression coding, Control on Communication and coffret, video data is exported by IP network.In the IMAQ part, the abbreviation of the English Charge Coupled of CCD(Device, Chinese is a charge coupled device) and the abbreviation of the English Complementary Metal of CMOS(Oxide Semiconductor, Chinese is a complementary metal oxide semiconductors (CMOS)) two kinds of transducers design at different demands respectively, CMOS is having certain advantage aspect the high pixel, and CCD is better to the adaptability of monitoring scene.In the video compression coding part, different compression algorithms and algorithm implementation have determined the quality and the code efficiency of high-definition image.In the Control on Communication part, the encapsulation format of the adaptability of network, fail safe, code stream and transfer function all depend on the planning and the design of supervisory control system.In the coffret part, adopt network access mode.The power pack of power supply adopts civil power 220V power supply.
The components and parts integrated level of high definition web camera inside is more and more higher, and function is more and more complete, but bear superpotential ability but more and more a little less than.The installation site of high definition web camera, the inside that is installed in building that has, the power supply of network high-definition camera by the Network Transmission picture signal, is given by transmission line in the spacious place that is installed in the building outside that has.By the principle analysis of the electrostatic induction of thunder and lightning and electromagnetic induction as can be known, when thundercloud weather, will in the communication line of network high-definition camera and supply line, produce lightning overvoltage, be incorporated in the network high-definition camera, cause the damage of equipment by cable.The signaling interface part and the power interface part of high definition web camera have generally all designed lightning protected element, as the semiconductor protection components and parts.But owing to be subjected to the restriction of internal circuit configuration, the protective circuit of portion's design within it exists bears the little shortcoming of through-flow energy.When the amplitude of lightning overvoltage less, the energy of lightning wave hour, these protection components play the certain protection effect.Higher when the lightning voltage amplitude, when the lightning wave energy was big, these devices usually caused the damage that self damages, also can cause equipment sometimes.
Thunder and lightning risk assessment according to IEC62305; the abbreviation of the English Surge protection of SPD(Device being installed at the signal port of equipment and power port; Chinese is a surge protector); the one, the thunder and lightning energy is discharged into the earth; the 2nd, realizing clamp between signal port and between the power supply port of equipment, with the amplitude limitation of lightning overvoltage in the withstand voltage scope that equipment can bear.
Summary of the invention
The invention provides a kind of surge protector of high definition web camera; with the amplitude limitation of lightning overvoltage in the withstand voltage scope that the networking video camera can bear; the high definition web camera is played protective effect, guaranteed the normal operation of high definition web camera.
The present invention adopts following technical scheme for solving its technical problem:
A kind of surge protector of high definition web camera, comprise power protection part and and the signal protection part, the power protection part partly links to each other by the PE line with signal protection.
Described power protection partly comprises first order vertical protection circuit, decoupling component, second level cross-protection circuit, failure protecting device, fault display device; first order vertical protection circuit, decoupling component and second level cross-protection circuit are linked in sequence, and failure protecting device is connected with first order vertical protection circuit respectively with fault display device.
Described signal protection part is linked in sequence by first order vertical protection circuit, isolated component and second level cross-protection circuit.
The circuit of described power protection part comprises three Zinc-oxide piezoresistors; three Thermal Cutoffs; light-emitting diode; general-purpose diode; resistance; two inductance; the series circuit of first Thermal Cutoffs and first Zinc-oxide piezoresistor is connected between input positive line L and the neutral line PE; the series circuit of second Zinc-oxide piezoresistor and second Thermal Cutoffs is connected between neutral line PE and the negative line N; the series circuit of the 3rd Thermal Cutoffs and the 3rd Zinc-oxide piezoresistor is connected between input positive line L and the negative line N; first inductance is serially connected on the input positive line L of the first Thermal Cutoffs positive input terminal and the 3rd Thermal Cutoffs positive input terminal; second inductance is serially connected on the negative line N of the second Thermal Cutoffs negative input end and the 3rd Zinc-oxide piezoresistor negative input end, light-emitting diode; the series circuit of general-purpose diode and resistance is connected between the first Thermal Cutoffs negative output terminal and the second Zinc-oxide piezoresistor negative output terminal.
The circuit of described signal protection part comprises two gas discharge tubes, four resistance, two non-polar solid discharging tubes, two rectifier bridges, first gas discharge tube is parallel to the two ends of twist paired signal line 1,2, second gas discharge tube is parallel to the two ends of twist paired signal line 3,6, and first resistance string is linked in the twisted-pair feeder 1, second resistance string is linked in the twisted-pair feeder 2, the 3rd resistance string is linked in the twisted-pair feeder 3, the 4th resistance string is linked in the twisted-pair feeder 6; The interchange polar end of first rectifier bridge is received twisted- pair feeder 1,2 two ends respectively, the positive-negative polarity end of first rectifier bridge has connected the first non-polar solid discharging tube, the interchange polar end of second rectifier bridge is received twisted- pair feeder 3,6 two ends respectively, and the positive-negative polarity end of second rectifier bridge has connected the second non-polar solid discharging tube.
Beneficial effect of the present invention is as follows:
(1) in the power protection part:
1. mounting means adopts the mode that is installed in series, and binding post uses the connector of standard, and is easy for installation.
2. the protected mode of circuit has two kinds of differential mode voltage protection and common-mode voltage protections.Discharge capacity is big, and residual voltage is low, adopts inductance to isolate between the two-stage, has reduced the voltage of lightning wave.
3. be provided with failure protecting device and fault display device in the circuit, can observe the operating state of surge protector intuitively.
(2) in the signal protection part:
1. binding post adopts the RJ45 terminals of standard, is installed in series in the line, and is easy for installation.
2. the protected mode of circuit is divided differential mode voltage protection and common-mode voltage protection.The common-mode voltage protected mode adopts the gas discharge tube device, has through-flow big, advantage that residual voltage is low.The differential mode voltage protected mode adopts rectifier bridge to match with solid discharging tube, and it is little to have a distributed capacitance, the advantage that residual voltage is low.
3. adopt the mode of resistive isolation between the two-stage, the energy of lightning wave is had certain loss, improved the performance of protection, further reduced the residual voltage of surge protector output.
Description of drawings
Fig. 1 is the circuit structure block diagram of the surge protector of high definition web camera.
Fig. 2 is the circuit diagram of the power protection part of high definition web camera.
Fig. 3 is the circuit diagram of the signal protection part of high definition web camera.
Fig. 4 is that the device of high definition web camera surge protector is installed way circuit figure.
Embodiment
Below in conjunction with accompanying drawing the invention is described in further details.
As shown in Figure 1, a kind of surge protector of high definition web camera, comprise power protection part and and the signal protection part, the power protection part partly links to each other by the PE line with signal protection.Described power protection partly comprises first order vertical protection circuit, decoupling component, second level cross-protection circuit, failure protecting device, fault display device; first order vertical protection circuit, decoupling component and second level cross-protection circuit are linked in sequence, and failure protecting device is connected with first order vertical protection circuit respectively with fault display device.Described signal protection part is linked in sequence by first order vertical protection circuit, isolated component and second level cross-protection circuit.
The circuit diagram of the power protection part of the surge protector of high definition web camera as shown in Figure 2; the power supply of video camera adopts civil power 220V Alternating Current Power Supply; Rn1, Rn2, Rn3 are Zinc-oxide piezoresistor; Rt1, Rt2, Rt3 are Thermal Cutoffs; LED is that light-emitting diode, D1 are that general-purpose diode, R5 are resistance, and L1, L2 are inductance.The operation principle of circuit: the circuit that constitutes first order lightning protection by the first Zinc-oxide piezoresistor Rn1, the second Zinc-oxide piezoresistor Rn2; when on circuit L, the N line lightning overvoltage being arranged; the first Zinc-oxide piezoresistor Rn1, second Zinc-oxide piezoresistor Rn2 action is discharged into the earth with the energy of lightning wave; the overvoltage Limiting of the lightning wave on L, the N line in the overvoltage scope that video camera can bear, is played the function of vertical protection.It is the Zinc-oxide piezoresistor of 620V that the first Zinc-oxide piezoresistor Rn1, the second Zinc-oxide piezoresistor Rn2 select reference voltage for use.Can cause self aging phenomenon occurring when the first Zinc-oxide piezoresistor Rn1 bears civil power 220V voltage for a long time in the line, the leakage current of appearance will cause the first Zinc-oxide piezoresistor Rn1 temperature to raise, and have the danger of blast on fire when serious.The first Thermal Cutoffs Rt1 and the first Zinc-oxide piezoresistor Rn1 are installed in series together, when above-mentioned phenomenon occurring, first Thermal Cutoffs Rt1 fusing automatically because temperature of the first Zinc-oxide piezoresistor Rn1 raises makes the voltage of the Zinc-oxide piezoresistor Rn1 open-circuit line of winning can normally work to guarantee circuit.When the wiring misoperation is that L, N line connect inverse time, the effect of the second Thermal Cutoffs Rt2 is with the first Thermal Cutoffs Rt1.
In the power protection part: the first Thermal Cutoffs Rt1, the first Zinc-oxide piezoresistor Rn1, the second Thermal Cutoffs Rt2, the second Zinc-oxide piezoresistor Rn2 have formed first order vertical protection; LED, general-purpose diode D1, resistance R 5 have been formed fault display device; The first Thermal Cutoffs Rt1 and the second Thermal Cutoffs Rt2 have formed failure protecting device; Inductance L 1 and inductance L 2 have been formed decoupling component; The 3rd Thermal Cutoffs Rt3 and the 3rd Zinc-oxide piezoresistor Rn3 have formed second level cross-protection.The first Thermal Cutoffs Rt1 be connected in parallel between L and the PE after the first Zinc-oxide piezoresistor Rn1 connects, the second Zinc-oxide piezoresistor Rn2 be connected in parallel between PE and the N after the second Thermal Cutoffs Rt2 connects.Be connected to the lower end of the first Thermal Cutoffs Rt1 and the upper end of the second Thermal Cutoffs Rt2 after LED, general-purpose diode D1, resistance R 5 series connection.Inductance L 1 is connected in series in the L line, and inductance L 2 is connected in series in the N line.The 3rd Thermal Cutoffs Rt3 be parallel between L and the N after the 3rd Zinc-oxide piezoresistor Rn3 connects.
The circuit diagram of the signal protection part of the surge protector of high definition web camera as shown in Figure 3; operation principle: the mode of connection is according to the RJ45 standard interface definition; with RJ45 binding post numbering 1,2 and 3,6 respectively as two groups of signals of transmitting-receiving, adopt 2 pairs of twisted-pair feeders to transmit.G1, G2 are gas discharge tube in the circuit, and direct-current discharge voltage is 230V, and maximum discharge capacity 10kA, nominal discharge current are 5kA, and its main effect is to play the effect that discharges the lightning current energy when in the circuit lightning overvoltage being arranged.R1, R2, R3, R4 are isolation resistance, and size is 2.2 ohm, in circuit, play buffer compartment from effect, when lightning current flows through, the protection device of buffer circuit back, and the energy of lightning wave had the certain absorption function.B1, B2 are rectifier bridge; U1, U2 are solid discharging tube; B1, B2, U1, U2 constitute clamp circuit between line; major function is to make voltage clamping between line in the voltage range that the camera signal port can bear; play the function of cross-protection; secondly the circuit of rectifier bridge B1, B2 formation plays the effect that reduces solid discharging tube U1, U2 distributed capacitance, reduces the loss in the signals transmission.The sort circuit structure Design has the function to release of lightning wave energy and clamp, also has the little characteristics of transmission signals decay.
In the signal protection part: gas discharge tube G1, G2 have formed first order vertical protection; Resistance R 1, R2, R3, R4 form isolated component; The first non-polar solid discharging tube U1, the first rectifier bridge B1, the second non-polar solid discharging tube U2, the second rectifier bridge B2 have formed second level cross-protection.The first gas discharge tube G1 is parallel to the two ends of twist paired signal line 1,2, and the second gas discharge tube G2 is parallel to the two ends of 3,6 twist paired signal lines.First resistance R 1 is connected in series in the twisted-pair feeder 1, second resistance R 2 is connected in series in the twisted-pair feeder 2, the 3rd resistance R 3 is connected in series in the twisted-pair feeder 3, the 4th resistance R 4 is connected in series in the twisted-pair feeder 6; The interchange polar end of the first rectifier bridge B1 is received twisted- pair feeder 1,2 two ends respectively, and the positive-negative polarity end of the first rectifier bridge B1 has connected the first non-polar solid discharging tube U1; The second rectifier bridge B2 the interchange polar end receive twisted- pair feeder 3,6 two ends respectively, the positive-negative polarity end of the second rectifier bridge B2 has connected the second non-polar solid discharging tube U2.
The device of web camera surge protector is installed way circuit figure as shown in Figure 4; in the layout of element; the design of power unit and signal section is divided into two parts; can reduce the interference of mains supply to signal circuit like this, binding post adopts the RJ45 Interface Terminal of standard connector (spacing is 5.08mm) and standard.Power unit is connected by the PE line with signal section.LED, R5(size are 20 kilohms among the figure), D1 forms fault display device, when in the circuit during operate as normal, the LED lamp is lighted always; When Rn1 in the circuit wears out owing to leakage current and temperature will cause Rt1 Thermal Cutoffs (as failure protecting device) fusing when raising; the LED lamp will extinguish this moment; fault has appearred in cue circuit; in addition; the LED lamp can also indicating circuit in L, N line whether connect instead, can't light if connect the inverse time lamp.
Claims (5)
1. the surge protector of a high definition web camera, it is characterized in that comprising the power protection part and and the signal protection part, the power protection part partly links to each other by the PE line with signal protection.
2. the surge protector of a kind of high definition web camera according to claim 1; it is characterized in that described power protection partly comprises first order vertical protection circuit, decoupling component, second level cross-protection circuit, failure protecting device, fault display device; first order vertical protection circuit, decoupling component and second level cross-protection circuit are linked in sequence, and failure protecting device is connected with first order vertical protection circuit respectively with fault display device.
3. the surge protector of a kind of high definition web camera according to claim 1 is characterized in that described signal protection part is linked in sequence by first order vertical protection circuit, isolated component and second level cross-protection circuit.
4. the surge protector of a kind of high definition web camera according to claim 2; the circuit that it is characterized in that described power protection part comprises three Zinc-oxide piezoresistor (Rn1; Rn2; Rn3); three Thermal Cutoffs (Rt1; Rt2; Rt3); LED; general-purpose diode D1; resistance R 5; two inductance (L1; L2); the series circuit of first Thermal Cutoffs (Rt1) and first Zinc-oxide piezoresistor (Rn1) is connected between input positive line L and the neutral line PE; the series circuit of second Zinc-oxide piezoresistor (Rn2) and second Thermal Cutoffs (Rt2) is connected between neutral line PE and the negative line N; the series circuit of the 3rd Thermal Cutoffs (Rt3) and the 3rd Zinc-oxide piezoresistor (Rn3) is connected between input positive line L and the negative line N; first inductance (L1) is serially connected on the input positive line L of first Thermal Cutoffs (Rt1) positive input terminal and the 3rd Thermal Cutoffs (Rt3) positive input terminal; second inductance (L2) is serially connected on the negative line N of second Thermal Cutoffs (Rt2) negative input end and the 3rd Zinc-oxide piezoresistor (Rn3) negative input end, LED; the series circuit of general-purpose diode D1 and resistance R 5 is connected between first Thermal Cutoffs (Rt1) negative output terminal and second Zinc-oxide piezoresistor (Rn2) negative output terminal.
5. the surge protector of a kind of high definition web camera according to claim 1, the circuit that it is characterized in that described signal protection part comprises two gas discharge tube (G1, G2), four resistance (R1, R2, R3, R4), two non-polar solid discharging tube (U1, U2), two rectifier bridge (B1, B2), first gas discharge tube (G1) is parallel to twist paired signal line 1,2 two ends, second gas discharge tube (G2) is parallel to twist paired signal line 3,6 two ends, first resistance (R1) is connected in series in the twisted-pair feeder 1, second resistance (R2) is connected in series in the twisted-pair feeder 2, the 3rd resistance (R3) is connected in series in the twisted-pair feeder 3, the 4th resistance (R4) is connected in series in the twisted-pair feeder 6; The interchange polar end of first rectifier bridge (B1) is received twisted-pair feeder 1,2 two ends respectively, the positive-negative polarity end of first rectifier bridge (B1) has connected the first non-polar solid discharging tube (U1), the interchange polar end of second rectifier bridge (B2) is received twisted-pair feeder 3,6 two ends respectively, and the positive-negative polarity end of second rectifier bridge (B2) has connected the second non-polar solid discharging tube (U2).
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| CN2010105478825A CN101976830A (en) | 2010-11-18 | 2010-11-18 | Surge protection device of high-definition network video camera |
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| CN2010105478825A CN101976830A (en) | 2010-11-18 | 2010-11-18 | Surge protection device of high-definition network video camera |
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| CN102761116A (en) * | 2011-12-26 | 2012-10-31 | 惠州茂硕能源科技有限公司 | Triple suppression circuit of power grid abnormity |
| CN103384064A (en) * | 2013-07-16 | 2013-11-06 | 深圳远征技术有限公司 | Distribution system concentrated ground protection and lightning protection device and system |
| CN104167724A (en) * | 2014-09-08 | 2014-11-26 | 南京宁普防雷设备制造有限公司 | Isolating-type bidirectional communication signal lighting protection device |
| CN104362604A (en) * | 2014-11-07 | 2015-02-18 | 南京信息工程大学 | Surge protection device of mid-span active Ethernet |
| CN109638799A (en) * | 2018-12-27 | 2019-04-16 | 深圳锦天乐防雷技术有限公司 | A kind of combined system for inhibiting strong lightning surge electromagnetic pulse in base station |
| CN112688290A (en) * | 2020-12-29 | 2021-04-20 | 上海闪替电子科技有限公司 | Transient overvoltage protection device of LED street lamp driving power supply |
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| CN102761116A (en) * | 2011-12-26 | 2012-10-31 | 惠州茂硕能源科技有限公司 | Triple suppression circuit of power grid abnormity |
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| CN104362604A (en) * | 2014-11-07 | 2015-02-18 | 南京信息工程大学 | Surge protection device of mid-span active Ethernet |
| CN109638799A (en) * | 2018-12-27 | 2019-04-16 | 深圳锦天乐防雷技术有限公司 | A kind of combined system for inhibiting strong lightning surge electromagnetic pulse in base station |
| CN112688290A (en) * | 2020-12-29 | 2021-04-20 | 上海闪替电子科技有限公司 | Transient overvoltage protection device of LED street lamp driving power supply |
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Application publication date: 20110216 |