CN107454719B - Device with electric overstress protection and overvoltage bypass functions - Google Patents
Device with electric overstress protection and overvoltage bypass functions Download PDFInfo
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- CN107454719B CN107454719B CN201710770209.XA CN201710770209A CN107454719B CN 107454719 B CN107454719 B CN 107454719B CN 201710770209 A CN201710770209 A CN 201710770209A CN 107454719 B CN107454719 B CN 107454719B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention relates to a device with electric overstress protection and overvoltage bypass functions, which comprises a power circuit, an electric overstress protection circuit and an overvoltage bypass circuit, wherein the power circuit is connected with the overvoltage bypass circuit; the positive output end of the power supply circuit is connected with the positive input end of the electric overstress protection circuit; the negative output end of the power supply circuit is connected with the negative input end of the electrical overstress protection circuit; the positive electrode output end of the electric over-stress protection circuit is connected with the positive electrode input end of the overvoltage bypass circuit; the negative electrode output end of the electric over-stress protection circuit is connected with the negative electrode input end of the overvoltage bypass circuit; the overvoltage bypass circuit is used for supplying power to the LED lamp bank. The device with the functions of electric overstress protection and overvoltage bypass effectively improves the working stability of the LED lamp bank.
Description
Technical Field
The invention relates to a device with electrical overstress protection and overvoltage bypass functions.
Background
LED lighting has advantages such as high luminous efficiency and long life, and has become the most mainstream lighting. However, LED failure can also result if not used properly in engineering. EOS is an abbreviation for Electrical Over Stress, simply Electrical overstress is the application of current to an LED that exceeds the maximum current specified in the LED datasheet. This is independent of the number or duration of EOS events, as any one EOS event may result in LED damage. Such damage may manifest itself as an immediate failure of the LED device (bond wire blow, chip/zener breakdown, burn out, etc.) or may fail only after a significant period of the EOS event
The reason for the occurrence of overstress:
1) An electrostatic discharge (ESD) event;
2) LED overdrive (sustained over voltage/over current event);
3) A transient over-current event.
The probability of the first two electrical over-stress events is relatively small, and the occurrence of the over-stress event is mainly related to the transient over-current event. Upon occurrence of a transient overcurrent event, the current through the LED will be higher than the maximum rated current in the LED specification, which may be generated directly by high current or indirectly by high voltage. These events are transient, meaning they occur for a very short period of time, typically no more than one second. They are also sometimes referred to as "spikes" (spikes), such as "current spikes" or "voltage spikes". If the LED power output is in poor contact with the LED input or if an overcurrent event occurs immediately when the LED is powered on or plugged into a powered power supply (also referred to as "hot-plug"), such overcurrent event is referred to as "inrush current". The reason for generating surge current is related to the design of an LED power supply, the idle voltage of the power supply is higher than the working voltage of the LED, and when the LED is in poor contact or is plugged in and pulled out in a hot-line mode, the capacitor at the output end of the power supply can discharge instantly to generate the surge current. This "inrush current" often occurs in LED lighting engineering, for example, a contact failure phenomenon often occurs in lighting with a vibration source, and there are often workers in lighting engineering installation and maintenance: "hot plugging" phenomena, both of which can cause LED failure.
In addition, LED lighting has advantages such as high luminous efficiency and long life, and has become the most mainstream lighting. However, LED failure can also result if not used properly in engineering. Currently, the high power LED lighting design generally adopts multi-module series or multi-module parallel mode test, and both designs have their own disadvantages.
Multi-module series mode:
the advantages are that: the LED working voltage is higher, the efficiency of a power supply is higher, the LED working current is smaller, and the line loss of a circuit is smaller; the disadvantages are that: the single module is invalid, and other modules are turned off, so that the lighting effect is influenced.
Multi-module parallel mode: the advantages are that: when a single module fails, other modules normally light up; the disadvantages are as follows: 1. the multi-module parallel LED has lower working voltage, lower power efficiency, larger LED working current and larger line loss. 2. When one of the LED modules fails, the working currents of other LED modules are increased, so that the aging speed of other LED modules is accelerated, and the service lives of other LED modules are seriously influenced.
Disclosure of Invention
The invention aims to provide a device with functions of electrical overstress protection and overvoltage bypass, so as to overcome the defects in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows: a device with electric overstress protection and overvoltage bypass function comprises a power circuit, an electric overstress protection circuit and an overvoltage bypass device; the positive output end of the power supply circuit is connected with the positive input end of the electrical overstress protection circuit; the negative electrode output end of the power supply circuit is connected with the negative electrode input end of the electric over-stress protection circuit; the positive electrode output end of the electric over-stress protection circuit is connected with the positive electrode input end of the overvoltage bypass device; the negative electrode output end of the electric over-stress protection circuit is connected with the negative electrode input end of the overvoltage bypass device; the overvoltage bypass circuit is used for supplying power to the LED lamp bank.
In one embodiment of the present invention, the power supply circuit includes: the power supply circuit comprises an EMI circuit, a first rectifying circuit, an MOS driving circuit, a transformer circuit, an auxiliary power supply circuit, a secondary rectifying circuit and a voltage and current feedback circuit; the input end of the EMI circuit is connected with a 220V power supply line, and the output end of the EMI circuit is connected with the input end of the first rectifying circuit; the first output end of the first rectifying circuit is connected with the input end of the transformer, and the second output end of the first rectifying circuit is connected with the first input end of the MOS driving circuit; the first output end of the transformer is connected with the input end of the auxiliary power supply; the output end of the auxiliary power supply is connected with the second input end of the MOS drive circuit; the second output end of the transformer is connected with the input end of the secondary rectifying circuit; the first output end of the secondary rectification circuit is connected with the input end of the voltage and current feedback circuit; the output end of the voltage and current feedback circuit is connected with the third input end of the MOS drive circuit; and the positive output end of the secondary rectification circuit is used as the positive output end of the power supply circuit, and the negative output end of the secondary rectification circuit is used as the negative output end of the power supply circuit.
In an embodiment of the present invention, the electrical overstress protection circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a triode, and a MOS transistor; one end of the first resistor is connected with the positive electrode output end of a power supply circuit and the positive electrode input end of the overvoltage bypass circuit respectively, and the other end of the first resistor is connected with one end of the second resistor; the other end of the second resistor is respectively connected with the emitter of the triode and the grid of the MOS tube; the base electrode of the triode is connected with one end of the third resistor; the other end of the third resistor is connected with one end of the fourth resistor and the source electrode of the MOS tube respectively; the other end of the fourth resistor is connected with the collector of the triode and the negative electrode output end of the power circuit respectively and is grounded; and the drain electrode of the MOS tube is connected with the negative electrode input end of the overvoltage bypass circuit.
In an embodiment of the present invention, the overvoltage bypass device includes a waterproof junction box and an overvoltage bypass circuit disposed in the waterproof junction box; the overvoltage bypass circuit comprises a plurality of overvoltage bypass units which are arranged in sequence; the overvoltage bypass unit comprises a fifth resistor, a sixth resistor, a first diode, a second diode and a capacitor; one end of the fifth resistor is respectively connected with the cathode of the first diode, the anode of the second diode and one end of the sixth resistor, is used as the anode output end of the overvoltage bypass unit and is connected with the anode input end of an LED lamp module; the other end of the fifth resistor is connected with the anode of the first diode and one end of the capacitor respectively; the other end of the capacitor is respectively connected with the cathode of the second diode and the other end of the sixth resistor, is used as a cathode output end of the overvoltage bypass unit, and is connected with a cathode input end of the LED lamp module; the overvoltage bypass circuit comprises a plurality of overvoltage bypass units, a plurality of overvoltage bypass units and a plurality of overvoltage bypass circuits, wherein the overvoltage bypass units are adjacent in sequence number, the positive output end of the latter overvoltage bypass unit is connected with the negative output end of the former overvoltage bypass unit, the positive output end of the first overvoltage bypass unit in the overvoltage bypass units is connected with the positive input end of the overvoltage bypass circuit, and the negative output end of the last overvoltage bypass unit is connected with the negative input end of the overvoltage bypass circuit; the positive input end of the overvoltage bypass circuit is connected with the positive input end of the overvoltage bypass device; and the negative electrode input end of the overvoltage bypass circuit is connected with the negative electrode input end of the overvoltage bypass device.
In one embodiment of the invention, the overvoltage bypass circuit is arranged at the bottom inside the waterproof junction box; a waterproof binding post is arranged on the outer side of the waterproof junction box corresponding to each overvoltage bypass unit; the waterproof binding post is internally provided with a positive output end and a negative output end of the corresponding overvoltage bypass unit; the LED lamp module is provided with a waterproof joint corresponding to the waterproof wiring terminal, and a positive input end and a negative input end of the LED lamp module are arranged in the waterproof joint.
In an embodiment of the invention, the positive input terminal and the negative input terminal of the overvoltage bypass device are respectively disposed at two side ends of the waterproof junction box.
In an embodiment of the invention, the positive input terminal and the negative input terminal of the overvoltage bypass device are disposed at one side end of the waterproof junction box.
Compared with the prior art, the invention has the following beneficial effects: the device with the functions of electric overstress protection and overvoltage bypass effectively improves the working stability of the LED lamp bank.
Drawings
Fig. 1 is a schematic diagram of a device of the present invention having electrical overstress protection and overvoltage bypass capabilities.
Fig. 2 is a circuit diagram of an electrical overstress protection circuit in accordance with the present invention.
Fig. 3 is a circuit diagram of an overvoltage bypass circuit in the present invention.
Fig. 4 is a circuit diagram of a power supply circuit of the present invention.
Fig. 5 is a schematic view of a waterproof junction box according to an embodiment of the invention.
Fig. 6 is a schematic view of a waterproof junction box in another embodiment of the invention.
Detailed Description
The technical scheme of the invention is specifically explained in the following by combining the attached drawings.
The invention provides a device with electric overstress protection and overvoltage bypass function, as shown in figure 1, comprising a power circuit, an electric overstress protection circuit and an overvoltage bypass device; the positive output end of the power supply circuit is connected with the positive input end of the electrical overstress protection circuit; the negative output end of the power supply circuit is connected with the negative input end of the electrical overstress protection circuit; the positive electrode output end of the electric over-stress protection circuit is connected with the positive electrode input end of the overvoltage bypass device; the negative electrode output end of the electric over-stress protection circuit is connected with the negative electrode input end of the overvoltage bypass device; the overvoltage bypass device is used for supplying power to the LED lamp bank.
Further, in the present embodiment, as shown in fig. 2, the electrical overstress protection circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a transistor, and a MOS transistor; one end of the first resistor is connected with the anode output end of a power supply circuit and the anode input end of the overvoltage bypass circuit respectively, and the other end of the first resistor is connected with one end of the second resistor; the other end of the second resistor is respectively connected with the emitter of the triode and the grid of the MOS tube; the base electrode of the triode is connected with one end of the third resistor; the other end of the third resistor is connected with one end of the fourth resistor and the source electrode of the MOS tube respectively; the other end of the fourth resistor is connected with the collector of the triode and the negative electrode output end of the power circuit respectively and is grounded; and the drain electrode of the MOS tube is connected with the negative electrode input end of the overvoltage bypass circuit.
Further, in this embodiment, a transistor is 9013. The MOS tube adopts 11N80C.
Further, in this embodiment, as shown in fig. 3, the overvoltage bypass device includes a waterproof junction box and an overvoltage bypass circuit disposed in the waterproof junction box; the overvoltage bypass circuit comprises a plurality of overvoltage bypass units which are arranged in sequence; the overvoltage bypass unit comprises a fifth resistor, a sixth resistor, a first diode, a second diode and a capacitor; one end of a fifth resistor is respectively connected with the cathode of the first diode, the anode of the second diode and one end of a sixth resistor, is used as the anode output end of the overvoltage bypass unit and is connected with the anode input end of an LED lamp module; the other end of the fifth resistor is connected with the anode of the first diode and one end of the capacitor respectively; the other end of the capacitor is respectively connected with the cathode of the second diode and the other end of the sixth resistor, is used as the cathode output end of the overvoltage bypass unit and is connected with the cathode input end of the LED lamp module; the overvoltage bypass circuit comprises a plurality of overvoltage bypass units, wherein the two overvoltage bypass units are adjacent in sequence number, the positive electrode output end of the latter overvoltage bypass unit is connected with the negative electrode output end of the former overvoltage bypass unit, the positive electrode output end of the first overvoltage bypass unit in the overvoltage bypass units is connected with the positive electrode input end of the overvoltage bypass circuit, and the negative electrode output end of the last overvoltage bypass unit is connected with the negative electrode input end of the overvoltage bypass circuit; the positive input end of the overvoltage bypass circuit is connected with the positive input end of the overvoltage bypass device; and the negative electrode input end of the overvoltage bypass circuit is connected with the negative electrode input end of the overvoltage bypass device.
Further, in this embodiment, the lighting device includes 9 overvoltage bypass units and an LED lamp module matched with each overvoltage bypass unit.
Further, in this embodiment, as shown in fig. 5, the overvoltage bypass circuit is integrated on the PCB board 1 and is disposed in the waterproof junction box 2, a waterproof terminal 3 is disposed outside the waterproof junction box corresponding to the overvoltage bypass, and a positive output terminal and a negative output terminal of the overvoltage bypass unit are disposed in the waterproof terminal. The positive input terminal and the negative input terminal of the overvoltage bypass device can be arranged at two ends of the waterproof junction box as shown in fig. 5. As shown in fig. 6, the positive input terminal and the negative input terminal may be provided on one side of the waterproof junction box. The LED lamp module is provided with a waterproof joint, and a positive input end and a negative input end of the LED lamp module are arranged in the waterproof joint.
The waterproof grade of the waterproof junction box is IP67, the overvoltage bypass circuit is integrated into the waterproof junction box, and a protection circuit is protected from being affected with damp. The circuit is more reliable when used in outdoor environment. The use is convenient, the terminal box adopts a mode of one input and multiple outputs, and the interface adopts a mode of a connector. And moreover, a fool-proof design is made, and convenience and reliability of engineering installation are improved. By adopting a secondary die pressing process, an inner die for embedding the PCB is prepared, and after the inner die is cooled to a preset temperature, a waterproof junction box outer die is prepared to prevent the deformation caused by different coefficients of expansion with heat and contraction with cold of two different materials of the PCB and the plastic. The waterproof junction box integrated PCB has an additional overvoltage bypass function. In addition, the waterproof connector can protect the PCB from water. Through matching the over-stress protection circuit, the LED lamp bead can be well protected under the condition that an installer pulls out and inserts in an electrified way or under the condition that the contact of the power output end is poor, so that the LED lamp bead is not broken down by electric over-stress.
Further, in the present embodiment, DB4 is used as the first diode, and BTA06 is used as the second diode.
Further, in the present embodiment, as shown in fig. 4, a circuit diagram of the power supply circuit is shown. The power supply circuit includes: the power supply circuit comprises an EMI circuit, a first rectifying circuit, an MOS driving circuit, a transformer circuit, an auxiliary power supply circuit, a secondary rectifying circuit and a voltage and current feedback circuit; the input end of the EMI circuit is connected with a 220V power supply line, and the output end of the EMI circuit is connected with the input end of the first rectifying circuit; the first output end of the first rectifying circuit is connected with the input end of the transformer, and the second output end of the first rectifying circuit is connected with the first input end of the MOS drive circuit; the first output end of the transformer is connected with the input end of the auxiliary power supply; the output end of the auxiliary power supply is connected with the second input end of the MOS drive circuit; the second output end of the transformer is connected with the input end of the secondary rectifying circuit; the first output end of the secondary rectification circuit is connected with the input end of the voltage and current feedback circuit; the output end of the voltage and current feedback circuit is connected with the third input end of the MOS drive circuit; the positive output end of the secondary rectification circuit is used as the positive output end of the power supply circuit, and the negative output end of the secondary rectification circuit is used as the negative output end of the power supply circuit.
Further, in this embodiment, the output terminal of the power circuit is connected to the electrical overstress protection circuit, and then the LED lamp set is connected to the output terminal of the electrical overstress protection circuit. The current limiting value of the electric overstress protection circuit is larger than that of the power circuit and smaller than the maximum value of the rated current of the LED lamp group. In the normal work of the LED lamp bank, the MOS tube Q1 is in a conducting state, and the electric over-stress protection circuit does not work. When surge current occurs, the source electrode voltage of the MOS tube Q1 is increased, the electric over-stress protection circuit starts to limit current, and the LED lamp bank is protected. In this embodiment, the emitter and collector of the transistor Q2 are connected in reverse, so that the transistor Q2 has both the functions of an amplifier and a zener diode. The output end of the power circuit is connected with the electric over-stress protection circuit, the power circuit is a normal constant current source of the LED lamp bank, and the electric over-stress protection circuit plays a role in transient current limiting, so that double insurance is provided for the LED lamp. The LED lamp works more reliably.
Further, in this embodiment, the overvoltage bypass circuit is configured such that the trigger voltage of the trigger diode in each overvoltage bypass unit is higher than the operating voltage of the corresponding LED lamp module, so that when the LED lamp module operates normally, the voltage across the trigger diode does not reach the trigger voltage. The thyristor is not switched on. When the LED lamp module fails, the voltage of the trigger diode rises to reach the trigger voltage. The diode is turned on. At this time, the whole multi-module LED lamp set loop is conducted. And other LED lamp modules are normally lighted. The front end of the trigger diode is provided with a resistance-capacitance wave filtering circuit. The trigger diode DB34 is prevented from being erroneously triggered by the influence of the spike voltage. The two ends of the controllable silicon are connected with resistors with different resistance values in parallel to prevent the plurality of LED lamp modules from failing, and the starting voltage of the power circuit is increased to cause the power supply to be incapable of starting other LED lamp modules.
In this embodiment, for nine LED lamps of the existing chinese lantern, the original design is nine independent self-contained power bulbs, and after the device provided by the present invention is adopted, one power circuit supplies power to nine LED lamp modules, so that the efficiency and reliability of the chinese lantern are improved. For the multi-module series street lamp, the original design is a multi-module series circuit, wherein one module fails and the whole street lamp is not lighted. After the waterproof junction box with the functions of electric overstress protection and overvoltage bypass is adopted, when a module in the waterproof junction box fails, the lighting of other modules is not influenced.
The above are preferred embodiments of the present invention, and all changes made according to the technical solutions of the present invention that produce functional effects do not exceed the scope of the technical solutions of the present invention belong to the protection scope of the present invention.
Claims (5)
1. A device with electric overstress protection and overvoltage bypass function is characterized by comprising a power circuit, an electric overstress protection circuit and an overvoltage bypass device; the positive output end of the power supply circuit is connected with the positive input end of the electrical overstress protection circuit; the negative electrode output end of the power supply circuit is connected with the negative electrode input end of the electric over-stress protection circuit; the positive electrode output end of the electric over-stress protection circuit is connected with the positive electrode input end of the overvoltage bypass device; the negative electrode output end of the electric over-stress protection circuit is connected with the negative electrode input end of the overvoltage bypass device; the overvoltage bypass device is used for supplying power to the LED lamp bank;
the power supply circuit includes: the power supply circuit comprises an EMI circuit, a first rectifying circuit, an MOS driving circuit, a transformer circuit, an auxiliary power supply circuit, a secondary rectifying circuit and a voltage and current feedback circuit; the input end of the EMI circuit is connected with a 220V power supply line, and the output end of the EMI circuit is connected with the input end of the first rectifying circuit; the first output end of the first rectifying circuit is connected with the input end of the transformer, and the second output end of the first rectifying circuit is connected with the first input end of the MOS drive circuit; the first output end of the transformer is connected with the input end of the auxiliary power supply; the output end of the auxiliary power supply is connected with the second input end of the MOS drive circuit; the second output end of the transformer is connected with the input end of the secondary rectifying circuit; the first output end of the secondary rectification circuit is connected with the input end of the voltage and current feedback circuit; the output end of the voltage and current feedback circuit is connected with the third input end of the MOS drive circuit; the positive output end of the secondary rectification circuit is used as the positive output end of the power supply circuit, and the negative output end of the secondary rectification circuit is used as the negative output end of the power supply circuit;
the overvoltage bypass device comprises a waterproof junction box and an overvoltage bypass circuit arranged in the waterproof junction box; the overvoltage bypass circuit comprises a plurality of overvoltage bypass units which are arranged in sequence; the overvoltage bypass unit comprises a fifth resistor, a sixth resistor, a first diode, a second diode and a capacitor; one end of the fifth resistor is respectively connected with the cathode of the first diode, the anode of the second diode and one end of the sixth resistor, is used as the anode output end of the overvoltage bypass unit and is connected with the anode input end of an LED lamp module; the other end of the fifth resistor is connected with the anode of the first diode and one end of the capacitor respectively; the other end of the capacitor is connected with the cathode of the second diode and the other end of the sixth resistor respectively, serves as a cathode output end of the overvoltage bypass unit and is connected with a cathode input end of the LED lamp module; the overvoltage bypass circuit comprises a plurality of overvoltage bypass units, a plurality of overvoltage bypass units and a plurality of overvoltage bypass circuits, wherein the overvoltage bypass units are adjacent in sequence number, the positive output end of the latter overvoltage bypass unit is connected with the negative output end of the former overvoltage bypass unit, the positive output end of the first overvoltage bypass unit in the overvoltage bypass units is connected with the positive input end of the overvoltage bypass circuit, and the negative output end of the last overvoltage bypass unit is connected with the negative input end of the overvoltage bypass circuit; the positive input end of the overvoltage bypass circuit is connected with the positive input end of the overvoltage bypass device; and the negative electrode input end of the overvoltage bypass circuit is connected with the negative electrode input end of the overvoltage bypass device.
2. Device with electrical overstress protection and overvoltage bypass function according to claim 1,
the electric overstress protection circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a triode and an MOS (metal oxide semiconductor) tube; one end of the first resistor is connected with the positive output end of a power supply circuit and the positive input end of the overvoltage bypass circuit respectively, and the other end of the first resistor is connected with one end of the second resistor; the other end of the second resistor is respectively connected with the emitting electrode of the triode and the grid electrode of the MOS tube; the base electrode of the triode is connected with one end of the third resistor; the other end of the third resistor is connected with one end of the fourth resistor and the source electrode of the MOS tube respectively; the other end of the fourth resistor is connected with the collector of the triode and the negative electrode output end of the power circuit respectively and is grounded; and the drain electrode of the MOS tube is connected with the negative electrode input end of the overvoltage bypass circuit.
3. The device with electrical overstress protection and overvoltage bypass function as claimed in claim 1, wherein said overvoltage bypass circuit is disposed at the bottom inside said waterproof junction box; a waterproof binding post is arranged on the outer side of the waterproof junction box corresponding to each overvoltage bypass unit; the waterproof binding post is internally provided with a positive output end and a negative output end of the corresponding overvoltage bypass unit; the LED lamp module is provided with a waterproof joint corresponding to the waterproof wiring terminal, and a positive input end and a negative input end of the LED lamp module are arranged in the waterproof joint.
4. The device with electrical overstress protection and overvoltage bypass function as claimed in claim 1, wherein the positive input terminal and the negative input terminal of the overvoltage bypass device are respectively disposed at two side ends of the waterproof junction box.
5. The device with electrical overstress protection and overvoltage bypass function as claimed in claim 1, wherein the positive input terminal and the negative input terminal of the overvoltage bypass device are disposed at one side end of the waterproof junction box.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710770209.XA CN107454719B (en) | 2017-08-31 | 2017-08-31 | Device with electric overstress protection and overvoltage bypass functions |
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| CN201710770209.XA CN107454719B (en) | 2017-08-31 | 2017-08-31 | Device with electric overstress protection and overvoltage bypass functions |
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| WO2016000414A1 (en) * | 2014-07-03 | 2016-01-07 | 苏松得 | Valley-fill current correction and dimmable led drive circuit |
| CN106332406A (en) * | 2015-07-10 | 2017-01-11 | 桂林电子科技大学 | LED driver circuit with multi-channel independent control |
| CN106488615A (en) * | 2016-12-12 | 2017-03-08 | 戴露 | A kind of high efficient and reliable LED light group and its control method |
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2017
- 2017-08-31 CN CN201710770209.XA patent/CN107454719B/en active Active
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|---|---|---|---|---|
| CN103959904A (en) * | 2010-08-27 | 2014-07-30 | 美国明亮照明设备公司 | Solid state lighting driver with THDi bypass circuit |
| WO2013000106A1 (en) * | 2011-06-29 | 2013-01-03 | 宁波赛尔富电子有限公司 | Circuit for protecting led from surge |
| CN102740561A (en) * | 2012-06-04 | 2012-10-17 | 杭州展顺科技有限公司 | LED (Light Emitting Diode) driving circuit |
| WO2016000414A1 (en) * | 2014-07-03 | 2016-01-07 | 苏松得 | Valley-fill current correction and dimmable led drive circuit |
| CN204271568U (en) * | 2014-11-20 | 2015-04-15 | 广东德豪润达电气股份有限公司 | Waterproof junction box and use its LED lamp |
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| CN106488615A (en) * | 2016-12-12 | 2017-03-08 | 戴露 | A kind of high efficient and reliable LED light group and its control method |
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| CN107454719A (en) | 2017-12-08 |
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