CN207589218U - A kind of electrical overstress protection circuit - Google Patents
A kind of electrical overstress protection circuit Download PDFInfo
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- CN207589218U CN207589218U CN201721105639.1U CN201721105639U CN207589218U CN 207589218 U CN207589218 U CN 207589218U CN 201721105639 U CN201721105639 U CN 201721105639U CN 207589218 U CN207589218 U CN 207589218U
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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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Abstract
The utility model is related to a kind of electrical overstress protection circuit, including a first resistor, a second resistance, a 3rd resistor, one the 4th resistance, a triode and a metal-oxide-semiconductor；Electrode input end of the one end of first resistor respectively with the cathode output end of a power circuit and a LED light group is connected, and the other end of first resistor is connected with one end of second resistance；Grid of the other end of second resistance respectively with the emitter of triode and metal-oxide-semiconductor is connected；The base stage of triode is connected with one end of 3rd resistor；Source electrode of the other end of 3rd resistor respectively with one end of the 4th resistance and metal-oxide-semiconductor is connected；The other end of 4th resistance is connected with the cathode output end respectively with the collector of triode and power circuit, and is grounded；The drain electrode of metal-oxide-semiconductor is connected with the negative input of LED light group.A kind of electrical overstress protection circuit that the utility model is proposed, has the advantages of simple structure and easy realization, is effectively improved the job stability of LED light group.
Description
Technical field
The utility model is related to a kind of electrical overstress protection circuits.
Background technology
LED illumination has the advantages that the light efficiency high life is long, has become the illumination of most mainstream.But if in engineering not
When use, it is also possible to cause LED failure.EOS is the abbreviation of Electrical Over Stress, briefly, electrically
Overstress is exactly that the electric current applied on LED is more than maximum current specified in the LED datasheet.This and EOS things
The number or duration length of part are unrelated, because any EOS event may all cause LED to damage.This damage
LED devices can be shown as to fail immediately（Closing line fusing, is burnt chip/Zener breakdown）, it is also possible to EOS is occurring
After event for a long time after just fail
Overstress Producing reason：
1) static discharge (ESD) event；
2) LED overdrives（Sustained overvoltage/overcurrent event）；
3) transient over-current event.
Wherein, the first two kind electrical overstress event occurs that the probability is relatively small, and the generation of overstress event is mainly and transient state
Overcurrent event is related.When transient over-current event occurs, it will be above by the electric current of LED maximum rated in LED specifications
Electric current, this may be by high current and directly generates or generated indirectly by high voltage.These events are all transient states, that is
Extremely short time, usually not more than one second are only lasted for during generation.They are also sometimes referred to as " sharp cutting edge of a knife or a sword " (spike), example
Such as " electric current point cutting edge of a knife or a sword " or " voltage point cutting edge of a knife or a sword ".If LED power output terminal connecing in LED with LED input terminal loose contact or artificially
Overcurrent event, this overcurrent event quilt are generated immediately during power supply (also referred to as " the plugging ") that energization source or insertion are powered
Referred to as " surge current ".Surge current Producing reason is related with LED power design, and power supply floating voltage is higher than LED operation electricity
Pressure, when LED loose contacts or hot plugging, power output end capacitance, which will spark, generates surge current.This " surge electricity
Stream " often occurs in LED illumination engineering, for example, the loose contact phenomenon often occurred in the illumination for having vibration source, in gaffer
Journey installs and safeguards that kind often has worker：" hot plugging " phenomenon, these phenomenons can cause LED failure.
Invention content
It is in the prior art to overcome the purpose of this utility model is to provide a kind of electrical overstress protection circuit
Defect.
To achieve the above object, the technical solution of the utility model is：A kind of electrical overstress protection circuit, including one
One resistance, a second resistance, a 3rd resistor, one the 4th resistance, a triode and a metal-oxide-semiconductor；The one of the first resistor
Electrode input end respectively with the cathode output end of a power circuit and a LED light group is held to be connected, the first resistor it is another
One end is connected with one end of the second resistance；The other end of the second resistance respectively with the emitter of the triode and
The grid of the metal-oxide-semiconductor is connected；The base stage of the triode is connected with one end of the 3rd resistor；The 3rd resistor it is another
Source electrode of the one end respectively with one end of the 4th resistance and the metal-oxide-semiconductor is connected；The other end of 4th resistance is with dividing
Cathode output end not with the collector of the triode and the power circuit is connected, and is grounded；The drain electrode of the metal-oxide-semiconductor
It is connected with the negative input of the LED light group.
In one embodiment of the utility model, the LED light group includes the LED light module of a plurality of series connection.
In one embodiment of the utility model, the LED light group includes an over-pressed shunting device.
In one embodiment of the utility model, the overvoltage shunting device includes a waterproof junction box and to be set to this anti-
Over-pressed bypass circuit in water terminal box；The overvoltage bypass circuit includes a plurality of over-pressed by-pass units sequentially set；Institute
It states over-pressed by-pass unit and includes one the 5th resistance, one the 6th resistance, one first diode, one second diode and a capacitance；
One end of 5th resistance respectively with the cathode of first diode, second diode anode, it is described 6th electricity
One end of resistance is connected, and as the cathode output end of the overvoltage by-pass unit, and with the electrode input end phase of a LED light module
Even；The one end of the other end of 5th resistance respectively with the anode of first diode and the capacitance is connected；It is described
The other end of the other end of capacitance respectively with the cathode of second diode and the 6th resistance is connected, and is used as the mistake
The cathode output end of by-pass unit is pressed, and is connected with the negative input of the LED light module；A plurality of overvoltage bypasses are single
Two over-pressed by-pass units that serial number is adjacent in member, the cathode output end of latter overvoltage by-pass unit and previous over-pressed by-pass unit
Cathode output end be connected, and the cathode output end of first over-pressed by-pass unit in a plurality of over-pressed by-pass units with
The electrode input end of the overvoltage bypass circuit is connected, cathode output end and the overvoltage bypass electricity of the last one over-pressed by-pass unit
The negative input on road is connected.
In one embodiment of the utility model, the overvoltage bypass circuit is set to the bottom in the waterproof junction box；
Correspond to each over-pressed by-pass unit on the outside of the waterproof junction box and be provided with waterproof wiring column；It is set in the waterproof wiring column
There are the cathode output end and cathode output end of corresponding over-pressed by-pass unit；The LED light module is provided with corresponding and waterproof
Binding post matched waterproof connector is provided with the electrode input end and negative input of LED light module in the waterproof connector.
In one embodiment of the utility model, the electrode input end of the overvoltage bypass circuit and negative input difference
It is set to the two side ends of the waterproof junction box.
In one embodiment of the utility model, the electrode input end of the overvoltage bypass circuit and negative input setting
In one side of waterproof junction box.
In one embodiment of the utility model, the power circuit includes：EMI circuits, the first rectification circuit, MOS drivings
Circuit, transformer circuit, auxiliary power circuit, secondary rectification circuit and feedback of voltage and current circuit；The EMI circuits it is defeated
Enter to terminate 220V supply lines, output terminal is connected with the input terminal of first rectification circuit；The of first rectification circuit
One output terminal is connected with the transformer circuit input terminal, and second output terminal and the MOS of first rectification circuit drive
The first input end of circuit is connected；First output terminal of the transformer circuit is connected with the input terminal of the accessory power supply；Institute
The output terminal for stating accessory power supply is connected with the second input terminal of the MOS drive circuit；Second output of the transformer circuit
End is connected with the input terminal of the secondary rectification circuit；The first output terminal and the voltage and current of the secondary rectification circuit are anti-
The input terminal of current feed circuit is connected；The output terminal of the feedback of voltage and current circuit and the third input terminal of the MOS drive circuit
It is connected；Cathode output end of the cathode output end of the secondary rectification circuit as the power circuit, the secondary rectified current
Cathode output end of the cathode output end on road as the power circuit.
Compared to the prior art, the utility model has the advantages that：One kind that the utility model is proposed is electrical
Overstress protection circuit, optimizes circuit, has saved cost, has the advantages of simple structure and easy realization, and is effectively improved LED light group
Job stability.
Description of the drawings
Fig. 1 is the circuit diagram of electrical overstress protection circuit in the utility model.
Fig. 2 is the circuit diagram of LED light group in the utility model.
Fig. 3 is the circuit diagram of over-pressed bypass circuit in the utility model.
Fig. 4 is the circuit diagram of power circuit in the utility model.
Fig. 5 is the circuit diagram of power circuit in the utility model.
Fig. 6 is the schematic diagram of waterproof junction box in one embodiment of the utility model.
Fig. 7 is the schematic diagram of waterproof junction box in another embodiment of the utility model.
Specific embodiment
Below in conjunction with the accompanying drawings and existing software, the technical solution of the utility model is specifically described.In the explanation
Involved existing software is not the object that the utility model is protected in the process, and the utility model only protects the knot of the device
Structure and connection relation.
The utility model provides a kind of electrical overstress protection circuit, as shown in Figure 1, including a first resistor, one second
Resistance, a 3rd resistor, one the 4th resistance, a triode and a metal-oxide-semiconductor；One end of first resistor respectively with a power circuit
Cathode output end and the electrode input end of a LED light group be connected, the other end of first resistor and one end phase of second resistance
Even；Grid of the other end of second resistance respectively with the emitter of triode and metal-oxide-semiconductor is connected；The base stage and third of triode
One end of resistance is connected；Source electrode of the other end of 3rd resistor respectively with one end of the 4th resistance and metal-oxide-semiconductor is connected；4th electricity
The other end of resistance is connected with the cathode output end respectively with the collector of triode and power circuit, and is grounded；The leakage of metal-oxide-semiconductor
Pole is connected with the negative input of LED light group.
Further, in the present embodiment, triode uses 9013.Metal-oxide-semiconductor uses 11N80C.
Further, in the present embodiment, as shown in FIG. 4 and 5, it is the circuit diagram of power circuit.Power circuit packet
It includes：EMI circuits, the first rectification circuit, MOS drive circuit, transformer circuit, auxiliary power circuit, secondary rectification circuit and
Feedback of voltage and current circuit；The input termination 220V supply lines of EMI circuits, the input terminal phase of output terminal and the first rectification circuit
Even；First output terminal of the first rectification circuit is connected with transformer circuit input terminal, the second output terminal of the first rectification circuit with
The first input end of MOS drive circuit is connected；First output terminal of transformer circuit is connected with the input terminal of accessory power supply；Auxiliary
The output terminal of power supply is connected with the second input terminal of MOS drive circuit；The second output terminal of transformer circuit and secondary rectified current
The input terminal on road is connected；First output terminal of secondary rectification circuit is connected with the input terminal of feedback of voltage and current circuit；Voltage electricity
The output terminal of current feedback circuit is connected with the third input terminal of MOS drive circuit；The cathode output end conduct of secondary rectification circuit
The cathode output end of power circuit, the cathode output end of the cathode output end of secondary rectification circuit as power circuit.
Further, in the present embodiment, as shown in Fig. 2, LED light group includes the LED light module of a plurality of series connection, preferably
, including 9 LED light modules.
In addition, LED illumination has the advantages that the light efficiency high life is long, have become the illumination of most mainstream.But if in work
It is improperly used in journey, it is also possible to cause LED failure.Currently, in high-power LED illumination design it is general just adopt multimode string formation connection or
More modules in parallel mould examinations, and have the shortcomings that respective in both designs.Multimode group series model：Advantage：LED operation voltage compared with
Height, the efficiency of power supply is higher, and LED operation electric current is smaller, and circuit line loss is smaller；Shortcoming：Single mode group fails, and other modules are turned off the light,
Influence illuminating effect.Multimode group paralleling model：Advantage：Single mode group fails, other normal bright lights of mould；Shortcoming：1st, more modules in parallel
LED operation voltage is relatively low, power supply it is less efficient, LED operation electric current is larger, and line loss is larger.2nd, when one of module fail,
Other LED module operating currents increase, and therefore, accelerate other LED module aging speeds, seriously affect other LED module service life.
Further, in the present embodiment, in order to improve the job stability of LED light group, it is other that LED light group includes an overvoltage
Road device.
Further, in the present embodiment, as shown in figure 3, over-pressed shunting device includes a waterproof junction box and setting
In the over-pressed bypass circuit in the waterproof junction box；It is single that the overvoltage bypass circuit includes a plurality of overvoltage bypasses sequentially set
Member；Over-pressed by-pass unit includes one the 5th resistance, one the 6th resistance, one first diode, one second diode and a capacitance；
The one end of one end of 5th resistance respectively with the cathode of the first diode, the anode of the second diode, the 6th resistance is connected, and make
For the cathode output end of the overvoltage by-pass unit, and it is connected with the electrode input end of a LED light module；The other end of 5th resistance
One end with the anode of the first diode and capacitance is connected respectively；The other end of capacitance respectively with the cathode of the second diode with
And the 6th the other end of resistance be connected, and as the cathode output end of the overvoltage by-pass unit, and defeated with the cathode of LED light module
Enter end to be connected；Two adjacent over-pressed by-pass units of serial number in a plurality of overvoltage by-pass units, latter overvoltage by-pass unit is just
Pole output terminal is connected with the cathode output end of previous over-pressed by-pass unit, and first overvoltage in a plurality of over-pressed by-pass units
The cathode output end of by-pass unit is connected with the electrode input end of the overvoltage bypass circuit, the last one over-pressed by-pass unit is born
Pole output terminal is connected with the negative input of the overvoltage bypass circuit.The electrode input end of over-pressed bypass circuit is as LED light group
Electrode input end, the negative input of the negative input of over-pressed bypass circuit as LED light group.
Further, in the present embodiment, it is matched including 9 over-pressed by-pass units and with each over-pressed by-pass unit
LED light module.
Further, in the present embodiment, as described in Figure 6, over-pressed bypass circuit is integrated in 1 on a pcb board, and is set to
Correspond to overvoltage bypass in one waterproof junction box 2, on the outside of waterproof junction box and be provided with waterproof wiring column 3, set in waterproof wiring column
It is equipped with the cathode output end and cathode output end of over-pressed by-pass unit.The electrode input end and negative input of overvoltage bypass can
By the way of waterproof junction box both ends are set to as shown in Figure 6.Can also use as shown in fig. 7, by electrode input end and
Cathode inputs the mode for being set to waterproof junction box side.LED light module is provided with waterproof connector, is provided in waterproof connector
The electrode input end and negative input of LED light module.
The waterproof junction box waterproofing grade is IP67, and over-pressed bypass circuit is integrated into waterproof junction box, protects circuit
It does not make moist.Make circuit in outdoor environment using more reliable.Easy to use, using one by the way of having more, interface uses terminal box
The mode of connector.And fool-proof design is done, has improved the convenience and reliability of project installation.Employ secondary pressing mold work
Skill first prepares the internal model for being embedded pcb board, after internal model is cooled to a preset temperature, then prepares waterproof junction box external mold, with
Prevent that two kinds of different materials coefficient of thermal expansion and contraction of PCB and plastic cement are different and cause deformation.Overvoltage that waterproof junction box has integrated PCB mostly
Bypass functionality.In addition, waterproof junction box gives PCB waterproofing protections again.Circuit is protected by matching overstress, it can be in installer
LED lamp bead is protected well in the case of electrification plug or in the case of power output end loose contact, makes it not electric
Gas overstress breakdown failure.
Further, in the present embodiment, the first diode uses DB4, and the second diode uses BTA06.
Further, in the present embodiment, power circuit output end is accessed into electrical overstress protection circuit, then by LED
Lamp group is connected to the output terminal of electrical overstress protection circuit.The cut-off current of electrical overstress protection circuit is more than the limit of power circuit
Flow valuve, and the maximum value of the rated current less than LED light group.In the work of LED light group normality, metal-oxide-semiconductor Q1 is on shape
State, electrical overstress protection circuit do not work.When surge current occurs, the source electrode pole tension raising of metal-oxide-semiconductor Q1, electrical mistake should
Power protection circuit starts current limliting, protects LED light group.In the present embodiment, by the transmitting collection of triode Q2 and current collection collection reversal connection,
The function that triode Q2 is made to have amplifier function to have zener diode again.Power circuit output end access electrical overstress protection
Circuit, power circuit sheet is as LED light group normality constant-current source, and electrical overstress protection circuit then plays transient state current limliting work
With quite to dual fail-safe in LED lamp.Make LED lamp work more reliable.
Further, in the present embodiment, the triggering two in each over-pressed by-pass unit is designed in over-pressed bypass circuit
The trigger voltage of pole pipe is higher than corresponding LED light module operating voltage, in this way when LED light module works normally, diac
On voltage be not up to trigger voltage.It is silicon-controlled to be not turned on.When LED light module fails, the raising of diac voltage reaches
Trigger voltage.Diode current flow.At this point, entire multimode group LED light group circuit conducting.Other normal bright lights of LED light module.Triggering
Diode front end adds capacitance-resistance to consider wave circuit.Prevent the influence of peak voltage, false triggering diac DB34.Silicon-controlled both ends
Difference valued resistor in parallel, fails to prevent multiple LED light modules, and power circuit starts voltage and increases, and causes power supply that can not start
Other LED light modules.
In the present embodiment, for nine LED light on existing Chinese lamp, original be designed as nine independences it is self-powered and
LED light is that a power circuit is powered to nine LED light modules, in improving after the circuit proposed using the utility model
The efficiency and reliability of colourfully decorated lantern.Street lamp is joined for multimode string formation, original is designed as multimode group series circuit, wherein a certain module loses
Effect, whole small cup street lamp do not work.Using being protected with electrical overstress, after the waterproof junction box of over-pressed bypass functionality, when wherein mould one
Module fails, and does not influence other module bright lights.
It is the preferred embodiment of the utility model above, all changes made according to technical solutions of the utility model are produced
Function without departing from technical solutions of the utility model range when, belong to the scope of protection of the utility model.
Claims (8)
1. a kind of electrical overstress protection circuit, which is characterized in that including a first resistor, a second resistance, a 3rd resistor,
One the 4th resistance, a triode and a metal-oxide-semiconductor；One end of first resistor cathode output end with a power circuit respectively
And one the electrode input end of LED light group be connected, the other end of the first resistor is connected with one end of the second resistance；Institute
Grid of the other end of second resistance respectively with the emitter of the triode and the metal-oxide-semiconductor is stated to be connected；The triode
Base stage be connected with one end of the 3rd resistor；The other end of the 3rd resistor respectively with one end of the 4th resistance with
And the source electrode of the metal-oxide-semiconductor is connected；The other end of 4th resistance with respectively with the collector of the triode and described
The cathode output end of power circuit is connected, and is grounded；The drain electrode of the metal-oxide-semiconductor is connected with the negative input of the LED light group.
2. a kind of electrical overstress protection circuit according to claim 1, which is characterized in that the LED light group includes multiple
The LED light module of several series connection.
3. a kind of electrical overstress protection circuit according to claim 1, which is characterized in that the LED light group includes one
Over-pressed shunting device.
A kind of 4. electrical overstress protection circuit according to claim 3, which is characterized in that the overvoltage shunting device packet
The over-pressed bypass circuit for including a waterproof junction box and being set in the waterproof junction box；The overvoltage bypass circuit includes plural number
A over-pressed by-pass unit sequentially set；The overvoltage by-pass unit includes one the 5th resistance, one the 6th resistance, one the 1st pole
Pipe, one second diode and a capacitance；One end of 5th resistance respectively with the cathode of first diode, described
The anode of two diodes, the 6th resistance one end be connected, and as the cathode output end of the overvoltage by-pass unit, and with one
The electrode input end of LED light module is connected；The other end of 5th resistance respectively with the anode of first diode and
One end of the capacitance is connected；The other end of the capacitance respectively with the cathode of second diode and the 6th resistance
The other end be connected, and as the cathode output end of the overvoltage by-pass unit, and with the negative input phase of the LED light module
Even；Two adjacent over-pressed by-pass units of serial number, the anode of latter overvoltage by-pass unit in a plurality of over-pressed by-pass units
Output terminal is connected with the cathode output end of previous over-pressed by-pass unit, and first mistake in a plurality of over-pressed by-pass units
The cathode output end of pressure by-pass unit is connected with the electrode input end of the overvoltage bypass circuit, the last one over-pressed by-pass unit
Cathode output end is connected with the negative input of the overvoltage bypass circuit.
5. a kind of electrical overstress protection circuit according to claim 4, which is characterized in that the overvoltage bypass circuit is set
It is placed in the bottom in the waterproof junction box；Correspond to each over-pressed by-pass unit on the outside of the waterproof junction box and be provided with waterproof
Binding post；The cathode output end and cathode output end of corresponding over-pressed by-pass unit are provided in the waterproof wiring column；Institute
It states LED light module and is provided with the corresponding and matched waterproof connector of waterproof wiring column, LED light module is provided in the waterproof connector
Electrode input end and negative input.
6. a kind of electrical overstress protection circuit according to claim 5, which is characterized in that the overvoltage bypass circuit
Electrode input end and negative input are respectively arranged at the two side ends of the waterproof junction box.
7. a kind of electrical overstress protection circuit according to claim 4, which is characterized in that the overvoltage bypass circuit
Electrode input end and negative input are set to one side of waterproof junction box.
8. a kind of electrical overstress protection circuit according to claim 1, which is characterized in that the power circuit includes：
EMI circuits, the first rectification circuit, MOS drive circuit, transformer circuit, auxiliary power circuit, secondary rectification circuit and voltage
Current feedback circuit；The input termination 220V supply lines of the EMI circuits, the input of output terminal and first rectification circuit
End is connected；First output terminal of first rectification circuit is connected with the transformer circuit input terminal, first rectified current
The second output terminal on road is connected with the first input end of the MOS drive circuit；First output terminal of the transformer circuit with
The input terminal of the accessory power supply is connected；The output terminal of the accessory power supply and the second input terminal phase of the MOS drive circuit
Even；The second output terminal of the transformer circuit is connected with the input terminal of the secondary rectification circuit；The secondary rectification circuit
The first output terminal be connected with the input terminal of the feedback of voltage and current circuit；The output terminal of the feedback of voltage and current circuit with
The third input terminal of the MOS drive circuit is connected；The cathode output end of the secondary rectification circuit is as the power circuit
Cathode output end, the cathode output end of the cathode output end of the secondary rectification circuit as the power circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721105639.1U CN207589218U (en) | 2017-08-31 | 2017-08-31 | A kind of electrical overstress protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721105639.1U CN207589218U (en) | 2017-08-31 | 2017-08-31 | A kind of electrical overstress protection circuit |
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| Publication Number | Publication Date |
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| CN207589218U true CN207589218U (en) | 2018-07-06 |
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ID=62727154
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721105639.1U Active CN207589218U (en) | 2017-08-31 | 2017-08-31 | A kind of electrical overstress protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323727A (en) * | 2019-07-15 | 2019-10-11 | 华勤通讯技术有限公司 | A kind of electrical overstress protection circuit and terminal |
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2017
- 2017-08-31 CN CN201721105639.1U patent/CN207589218U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323727A (en) * | 2019-07-15 | 2019-10-11 | 华勤通讯技术有限公司 | A kind of electrical overstress protection circuit and terminal |
| CN110323727B (en) * | 2019-07-15 | 2022-01-28 | 华勤技术股份有限公司 | Electric overstress protection circuit and terminal |
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