CN106793349A - The protection circuit of booting moment impact overvoltage - Google Patents
The protection circuit of booting moment impact overvoltage Download PDFInfo
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- CN106793349A CN106793349A CN201710168599.3A CN201710168599A CN106793349A CN 106793349 A CN106793349 A CN 106793349A CN 201710168599 A CN201710168599 A CN 201710168599A CN 106793349 A CN106793349 A CN 106793349A
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- branch road
- voltage signal
- electric capacity
- diode
- driving chip
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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
-
- 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]
Abstract
The present invention discloses a kind of protection circuit of booting moment impact overvoltage, including rectifying and wave-filtering branch road, receives first voltage signal and to first voltage signal rectification filtering output second voltage signal；PPFC branch road, with a power taking point, is adjusted to second voltage signal tertiary voltage signal and is exported by power taking point, and tertiary voltage signal voltage value is the half of second voltage signal；And drive branch road, including driving chip and connection driving chip the sub- branch road of peripheral driver；The power pins connection power taking point of driving chip；The sub- branch road of peripheral driver is in driving connected loaded work piece under the control of driving chip.First voltage signal elder generation rectifying and wave-filtering is second voltage signal, PPFC branch road adjustment second voltage signal is tertiary voltage signal, so that the magnitude of voltage of tertiary voltage signal is reduced to the half of the magnitude of voltage of second voltage signal, in tertiary voltage signal input driving chip, LDO components in driving chip will not be burnt.
Description
Technical field
The present invention relates to technology field of LED drive technology, in particular it relates to a kind of protection electricity of booting moment impact overvoltage
Road.
Background technology
Driving load LED together with the MP4001 driving chips drive circuit peripheral generally with its is connected to, makes the normal works of LED
Make.Recorded according to driving chip specifications, AC (the Alternating Current alternating currents) inputs of MP4001 driving chips
Voltage range is 85V-305V, but when ac input voltage is 305V, booting moment peak voltage is higher than 500V, and overtension is very
Easily burn MP4001 driving chip internal high pressures LDO (Low Dropout Regulator, low pressure difference linear voltage regulator) group
Part, therefore, it is necessary to provide a kind of protection circuit, prevents from burning driving chip inside LDO components during booting moment overtension.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of protection circuit of booting moment impact overvoltage.
A kind of protection circuit of machine moment impact overvoltage disclosed by the invention, including：
Rectifying and wave-filtering branch road, it is configured as receiving first voltage signal, and filters output to first voltage signal rectification
Second voltage signal；
PPFC branch road, is provided with a power taking point, and it is configured as receiving second voltage in signal,
Second voltage signal is adjusted to tertiary voltage signal, tertiary voltage signal is exported by power taking point, tertiary voltage signal voltage value
It is the half of second voltage signal voltage value；And
Branch road is driven, it includes driving chip and is connected to the sub- branch road of peripheral driver of driving chip；Driving chip
Power pins connect power taking point to receive tertiary voltage signal；The sub- branch road of peripheral driver under the control of driving chip drive and its
The loaded work piece of connection.
According to an embodiment of the present invention, rectifying and wave-filtering branch road includes fuse, filters sub- branch road and commutator branch
Road；Fuse, the sub- branch road of filtering and commutator branch road are in sequential series；Commutator branch road series passive PFC branch
Road；First voltage signal is input into by fuse, successively filtered sub- branch road filtering and commutator branch road rectification, commutator branch road
Export second voltage signal to PPFC branch road.
According to an embodiment of the present invention, filtering sub- branch road includes adjustable resistance, the first electric capacity, first resistor, first
Inductance, second resistance, the second inductance and the second electric capacity；Commutator branch road includes full-bridge rectification diode；
Fuse connects wherein one end of adjustable resistance, the first electric capacity, first resistor and the first inductance respectively；Adjustable electric
The other end of resistance and the first electric capacity connects wherein one end of the second inductance and second resistance respectively；First resistor and the first electricity
The other end of sense connects wherein one end and the full-bridge rectification diode of the second electric capacity respectively；Second inductance, second resistance and
The other end of two electric capacity connects full-bridge rectification diode respectively；Full-bridge rectification diode connected with passive PFC branch road.
According to an embodiment of the present invention, PPFC branch road includes the 3rd electric capacity, the first diode, the
Three resistance, the 4th electric capacity, the second diode and the 3rd diode；The positive pole connection rectifying and wave-filtering branch road of the 3rd electric capacity, negative pole
The positive pole of the first diode is connected, the negative pole of the first diode connects the input of 3rd resistor, the output end point of 3rd resistor
The positive pole of the second diode and the positive pole of the 4th electric capacity are not connected；The negative pole of the 4th electric capacity connects the positive pole of the 3rd diode and connects
Ground；The negative pole of the 3rd diode connects the positive pole of the first diode；Wherein, power taking point is arranged at the output end of 3rd resistor and the
Between the input of four electric capacity.
According to an embodiment of the present invention, it also includes rectification branch road；Rectification branch road is series at power taking point and drives core
Between the power pins of piece.
According to an embodiment of the present invention, it also includes filter branch；Wherein one end of filter branch respectively with power taking
The power pins connection of point and driving chip, the other end is connected and is grounded with the test pin of driving chip.
According to an embodiment of the present invention, the sub- branch road of peripheral driver includes the 7th electric capacity, FET, the five or two pole
Pipe, the 3rd inductance, the 8th electric capacity, the 9th electric capacity, the 4th resistance, the 5th resistance and the 6th diode；The driving of driving chip
Pin connects one end of the 7th electric capacity and the grid of FET respectively；The drain electrode of the other end and FET of the 7th electric capacity
Wherein one end of the 3rd inductance and the positive pole of the 5th diode are connected respectively；The positive pole of the negative pole connection load of the 5th diode；
The negative pole of the other end connection load of the 3rd inductance；The positive pole of wherein one end connection load of the 8th electric capacity, other end ground connection；The
The positive pole of one end connection load of nine electric capacity, the negative pole of other end connection load；The current legs of driving chip connect field respectively
Wherein one end of the source electrode of effect pipe, wherein one end of the 4th resistance and the 5th resistance；4th resistance and the 5th resistance it is another
One end is grounded simultaneously；6th diodes in parallel is between the drain electrode of FET and source electrode.
According to an embodiment of the present invention, rectification branch road includes the 4th diode, and the positive pole connection of the 4th diode takes
Electric, negative pole connects the power pins of driving chip.
According to an embodiment of the present invention, filter branch includes the 6th electric capacity, wherein one end of the 6th electric capacity respectively with
The power pins connection of power taking point and driving chip, the other end is connected and is grounded with the test pin of driving chip.
By PPFC branch road, when driving chip is input into first voltage signal, rectifying and wave-filtering branch is first passed through
Road rectifying and wave-filtering is second voltage signal, and PPFC branch road adjustment second voltage signal is tertiary voltage signal,
So that the magnitude of voltage of tertiary voltage signal is reduced to the half of the magnitude of voltage of second voltage signal, tertiary voltage signal is by power taking point
In input driving chip, LDO components in driving chip will not be burnt.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding of the present application, constitutes the part of the application, this Shen
Schematic description and description please does not constitute the improper restriction to the application for explaining the application.In the accompanying drawings：
Fig. 1 is the electrical block diagram of rectifying and wave-filtering branch road in embodiment；
Fig. 2 is the structural representation of PPFC branch road and driving branch road in embodiment；
Fig. 3 is dual channel oscilloscope collection booting moment surge voltage signal waveforms in embodiment.
Description of reference numerals：
1st, rectifying and wave-filtering branch road；2nd, PPFC branch road；3rd, branch road is driven；4th, rectification branch road；5th, filtering branch
Road；11st, sub- branch road is filtered；12nd, commutator branch road；31st, driving chip；32nd, the sub- branch road of peripheral driver；F1, fuse；RV1, can
Adjust resistance；C1, the first electric capacity；R1, first resistor；L1, the first inductance；R2, second resistance；L2, the second inductance；C2, the second electricity
Hold；D1, full-bridge rectification diode；C3, the 3rd electric capacity；D2, the first diode；R3,3rd resistor；C4, the 4th electric capacity；D3,
Two diodes；D4, the 3rd diode；D5, the 4th diode；C6, the 6th electric capacity；C7, the 7th electric capacity；M1, FET；D6、
5th diode；L3, the 3rd inductance；C8, the 8th electric capacity；C9, the 9th electric capacity；C10, the tenth electric capacity；R4, the 4th resistance；R5,
Five resistance；R6, the 6th resistance；D7, the 6th diode；E, power taking point；F, prior art oscillogram；G, the application oscillogram.
Specific embodiment
Hereinafter multiple implementation methods of the invention, as clearly stated, the details in many practices will be disclosed with schema
Will be explained in the following description.It should be appreciated, however, that the details in these practices is not applied to limit the present invention.Also
It is to say, in some embodiments of the invention, the details in these practices is non-essential.Additionally, for the sake of simplifying schema,
Some known usual structures will illustrate it in simply illustrative mode in the drawings with component.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used in the embodiment of the present invention
In relative position relation, motion conditions under a certain particular pose (as shown in drawings) between each part etc. are explained, if should
When particular pose changes, then directionality indicates also correspondingly to change therewith.
In addition, in the present invention such as relating to the description of " first ", " second " etc. be only used for describe purpose, not especially censure
The meaning of order or cis-position, is also not used to limit the present invention, and it is used for the purpose of the component that difference is described with constructed term
Or operation, and it is not intended that indicating or implying its relative importance or the implicit number for indicating indicated technical characteristic
Amount.Thus, " first " is defined, at least one this feature can be expressed or be implicitly included to the feature of " second ".In addition, each
Technical scheme between individual embodiment can be combined with each other, but must can be implemented as base with those of ordinary skill in the art
Plinth, when the combination appearance of technical scheme is conflicting or cannot realize it will be understood that the combination of this technical scheme does not exist,
Also not within the protection domain of application claims.
The present embodiment provides a kind of protection circuit of booting moment impact overvoltage.Protection circuit include rectifying and wave-filtering branch road 1,
PPFC branch road 2 and driving branch road 3.The input of rectifying and wave-filtering branch road 1 connects external ac power source to connect
First voltage signal is received, then to exporting second voltage signal after the filtering of first voltage signal rectification, second voltage signal is by rectification
The output end output of filter branch 1.PPFC branch road 2 is provided with a power taking point E, and its input receives the second electricity
Pressure signal, and second voltage signal is adjusted, exported to driving branch road 3 from power taking point E with tertiary voltage signal after adjustment,
The magnitude of voltage of tertiary voltage signal is the half of second voltage signal voltage value.Driving branch road 3 includes driving chip 31 and connects
The sub- branch road 32 of peripheral driver of driving chip 31 is connected to, the power pins VIN connection power taking point E of driving chip 31 are used to receive
Tertiary voltage signal, the sub- branch road 32 of peripheral driver is loaded in connected loaded work piece is driven under the control of driving chip 31
Usually LED.
First voltage signal is second voltage signal, PPFC by the rectifying and wave-filtering of rectifying and wave-filtering branch road 1
The adjustment second voltage signal of branch road 2 is tertiary voltage signal, and tertiary voltage signal makes from power taking point E input driving chips 31
Tertiary voltage signal magnitude of voltage be reduced to second voltage signal magnitude of voltage half, in will not burning driving chip 31
LDO components.
Refer to shown in Fig. 1, be the structural representation of rectifying and wave-filtering branch road 1.Rectifying and wave-filtering branch road 1 include fuse F1,
Filter sub- branch road 11 and commutator branch road 12；Fuse F1, the sub- branch road 11 of filtering and commutator branch road 12 are in sequential series；It is whole
Flow the series passive PFC branch road 2 of sub- branch road 12；First voltage signal is input into by fuse F1, successively filtered sub- branch
Road 11 filters and the rectification of commutator branch road 12, and commutator branch road 12 exports second voltage signal to PPFC branch
Road 2.Circuit is burned when fuse F1 prevents high current to be input into.In one embodiment, filtering sub- branch road 11 includes adjustable resistance
RV1, the first electric capacity C1, first resistor R1, the first inductance L1, second resistance R2, the second inductance L2 and the second electric capacity C2；Rectification
Sub- branch road 12 includes full-bridge rectification diode D1；Fuse F1 connects adjustable resistance RV1, the first electric capacity C1, first resistor respectively
Wherein one end of R1 and the first inductance L1；The other end of adjustable resistance RV1 and the first electric capacity C1 connects the second inductance respectively
Wherein one end of L2 and second resistance R2；The other end of first resistor R1 and the first inductance L1 connects the second electric capacity C2's respectively
Wherein one end and full-bridge rectification diode D1；The other end of the second inductance L2, second resistance R2 and the second electric capacity C2 connects respectively
Meet full-bridge rectification diode D1；Full-bridge rectification diode D1 connected with passive PFCs branch road 2.
Fig. 2 is refer to, is the structural representation of PPFC branch road 2 and driving branch road 3.Rectifying and wave-filtering branch
The output terminals A end on road 1 is electrically connected with the input C-terminal of PPFC branch road 2, the output end B of rectifying and wave-filtering branch road 1
End is electrically connected with the input D ends of PPFC branch road 2.PPFC branch road 2 includes the 3rd electric capacity
C3, the first diode D2,3rd resistor R3, the 4th electric capacity C4, the second diode D3 and the 3rd diode D4；3rd electric capacity C3
Positive pole connection rectifying and wave-filtering branch road 1, negative pole connects the positive pole of the first diode D2, the negative pole connection the 3rd of the first diode D2
The input of resistance R3, the output end of 3rd resistor R3 is connecting the positive pole and the 4th electric capacity C4 of the second diode D3 just respectively
Pole；The negative pole of the 4th electric capacity C4 connects the positive pole of the 3rd diode D4 and is grounded；The negative pole connection the one or two of the 3rd diode D4
The positive pole of pole pipe D2；Wherein, second voltage signal is input into by the positive pole of the 3rd electric capacity C3, through the electricity of the first diode D2 and the 3rd
The power pins VIN of tertiary voltage signal to driving chip 31 is exported after resistance R3 adjustment by power taking point E, power taking point E is arranged at the
Between the output end of three resistance R3 and the input of the 4th electric capacity C4.The sub- branch road 32 of peripheral driver includes that the 7th electric capacity C7, field are imitated
Should pipe M1, the 5th diode D6, the 3rd inductance L3, the 8th electric capacity C8, the 9th electric capacity C9, the 4th resistance R4, the 5th resistance R5 with
And the 6th diode D7；The driving pin DRV of driving chip 31 connects one end and the FET M1 of the 7th electric capacity C7 respectively
Grid；The drain electrode of the other end and FET M1 of the 7th electric capacity C7 connects wherein one end and the 5th of the 3rd inductance L3 respectively
The positive pole of diode D6；The positive pole of the negative pole connection load of the 5th diode D6；The other end connection load of the 3rd inductance L3
Negative pole；The positive pole of wherein one end connection load of the 8th electric capacity C8, other end ground connection；One end connection load of the 9th electric capacity C9
Positive pole, the negative pole of other end connection load；The current legs CS of driving chip 31 connects the source electrode of FET M1, the 4th respectively
Wherein one end of resistance R4 and wherein one end of the 5th resistance R5；The other end of the 4th resistance R4 and the 5th resistance R5 connects simultaneously
Ground；6th diode D7 is parallel between drain electrode and the source electrode of FET M1.In addition, the voltage pin VCC of driving chip 31
Connect the tenth electric capacity C10, connects the 6th between the vibration pin BOS and the grounding pin GND of driving chip 31 of driving chip 31
Resistance R6, the grounding pin GND of driving chip 31 is also grounded.
In another implementation method, protection circuit also includes rectification branch road 4；Rectification branch road 4 is series at power taking point E and drives core
Between the power pins VIN of piece 31.Rectification circuit is drawn after rectification is carried out to tertiary voltage signal by the power supply of driving chip 31
In pin VIN input driving chips 31.Specifically, rectification branch road 4 includes the 4th diode D5, and the positive pole of the 4th diode D5 is connected
Power taking point E, negative pole connects the power pins VIN of driving chip 31.
Preferably, protection circuit also includes filter branch 5；Wherein one end of filter branch 5 respectively with power taking point E and driving
The power pins VIN connections of chip, the other end is connected and is grounded with the test pin VS of driving chip.Further, the 3rd
After voltage signal is exported by power taking point E, the rectification of rectification branch road 4 is first passed through, then in input filter branch road 5.Filter branch 5 is wherein
One end connects power taking point E by rectification branch road 4.Filter branch 5 includes the 6th electric capacity C6, and wherein one end of the 6th electric capacity C6 is distinguished
Power pins VIN with power taking point E and driving chip 31 is connected, and the other end is connected and connects with the test pin VS of driving chip 31
Ground, further, wherein one end of the 6th electric capacity C6 connects power taking point E by rectification branch road 4.4th diode D5 and
Six electric capacity C6 make the pure noiseless clutter of the tertiary voltage signal in input driving chip.
When protection circuit works, with second voltage signal output after the rectified filtering of first voltage signal, second voltage letter
Number input PPFC branch road 2, second voltage signal is adjusted to tertiary voltage by PPFC branch road 2
Signal, tertiary voltage signal is exported to the power pins VIN of driving chip 31, due to the power pins of driving chip 31 by power taking point E
VIN receives tertiary voltage signal by power taking point E, and the magnitude of voltage of tertiary voltage signal is just the second electricity of rectifying and wave-filtering input
The half of signal voltage value is pressed, then using this voltage as the supply voltage of driving chip 31, would not again because of booting moment spike
Voltage burns chip internal high pressure LDO components higher than 500V.Fig. 2 is read again, and driving chip 31MP4001 powers and is connected on the 4th electricity
Hold on C4, this normal working voltage is about 240V, well below 500V, the 4th diode D5 and the is increased in the protection circuit
Six electric capacity C6, make the pure noiseless clutter of the tertiary voltage signal for being input to driving chip 31.Through lot of experiment validation, protection electricity
Road stabilization working properly.
In this example, protection circuit is up to the driving chip that direct current 500V wide scopes are powered for input voltage tolerance range
31MP4001 and the anti-overvoltage crowbar that designs, for preventing during input voltage AC277V, booting moment peak voltage is higher than
500V and burn the internal high pressure LDO components of driving chip 31, this protection circuit utilize the intermediate point of PPFC branch road 2
Voltage give driving chip 31 provide supply voltage.Circuit is simple and clear and with being obviously improved protective effect, as shown in figure 3,
Wherein F show the oscillogram for being measured using dual channel oscilloscope in the prior art, its magnitude of voltage shown in respective channel 1, start
The surge voltage of moment is 518V；G show the oscillogram measured using dual channel oscilloscope in the application, its respective channel 2
Shown magnitude of voltage, catches the surge voltage value of booting moment on the 4th electric capacity C4 for 243V, in the input voltage of driving chip 31
In claimed range.
The upper only embodiments of the present invention, are not intended to limit the invention.For those skilled in the art
For, the present invention can have various modifications and variations.It is all any modifications made in spirit and principles of the present invention, equivalent
Replace, improve etc., all should be included within scope of the presently claimed invention.
Claims (9)
1. a kind of booting moment impacts the protection circuit of overvoltage, it is characterised in that including：
Rectifying and wave-filtering branch road, it is configured as receiving first voltage signal, and filters output to the first voltage signal rectification
Second voltage signal；
PPFC branch road, is provided with a power taking point, and it is configured as receiving the second voltage in signal,
The second voltage signal is adjusted to tertiary voltage signal, the tertiary voltage signal is exported by the power taking point, described
Three voltage signal magnitudes of voltage are the half of the second voltage signal voltage value；And
Branch road is driven, it includes driving chip and is connected to the sub- branch road of peripheral driver of the driving chip；The driving core
The power pins of piece connect the power taking point to receive the tertiary voltage signal；The sub- branch road of peripheral driver is in the driving
Connected loaded work piece is driven under the control of chip.
2. booting moment according to claim 1 impacts the protection circuit of overvoltage, it is characterised in that the rectifying and wave-filtering branch
Road includes fuse, filters sub- branch road and commutator branch road；The fuse, the sub- branch road of filtering and commutator branch road are sequentially
Series connection；The commutator branch road series connection PPFC branch road；The first voltage signal is by the fuse
Input, successively through the sub- branch road filtering of the filtering and the commutator branch road rectification, the electricity of commutator branch road output second
Press signal to the PPFC branch road.
3. booting moment according to claim 2 impacts the protection circuit of overvoltage, it is characterised in that：
The sub- branch road of the filtering include adjustable resistance, the first electric capacity, first resistor, the first inductance, second resistance, the second inductance with
And second electric capacity；The commutator branch road includes full-bridge rectification diode；
The fuse connects wherein one end of the adjustable resistance, the first electric capacity, first resistor and the first inductance respectively；Institute
The other end for stating adjustable resistance and the first electric capacity connects wherein one end of second inductance and the second resistance respectively；Institute
The other end for stating first resistor and the first inductance connects wherein one end of second electric capacity and the full-bridge rectification respectively
Diode；The other end of second inductance, second resistance and second electric capacity connects the full-bridge rectification diode respectively；
The full-bridge rectification diode connects the PPFC branch road.
4. according to the protection circuit of any described booting moment impact overvoltages of claim 1-3, it is characterised in that described passive
PFC branch road includes the 3rd electric capacity, the first diode, 3rd resistor, the 4th electric capacity, the second diode and the 3rd
Diode；The positive pole of the 3rd electric capacity connects the rectifying and wave-filtering branch road, and negative pole connects the positive pole of first diode, institute
The negative pole for stating the first diode connects the input of the 3rd resistor, and the output end of the 3rd resistor connects described the respectively
The positive pole of the positive pole of two diodes and the 4th electric capacity；The negative pole of the 4th electric capacity connects the positive pole of the 3rd diode and connects
Ground；The negative pole of the 3rd diode connects the positive pole of first diode；Wherein, the power taking point is arranged at the described 3rd
Between the input of the output end of resistance and the 4th electric capacity.
5. according to the protection circuit of any described booting moment impact overvoltages of claim 1-3, it is characterised in that it also includes
Rectification branch road；The rectification branch road is series between the power taking point and the power pins of the driving chip.
6. according to the protection circuit of any described booting moment impact overvoltages of claim 1-3, it is characterised in that it also includes
Filter branch；Power pins of the wherein one end of the filter branch respectively with the power taking point and the driving chip are connected,
The other end is connected and is grounded with the test pin of the driving chip.
7. according to the protection circuit of any described booting moment impact overvoltages of claim 1-3, it is characterised in that the periphery
Driving sub- branch road includes the 7th electric capacity, FET, the 5th diode, the 3rd inductance, the 8th electric capacity, the 9th electric capacity, the 4th electricity
Resistance, the 5th resistance and the 6th diode；The driving pin of the driving chip connect respectively the 7th electric capacity one end and
The grid of the FET；The drain electrode of the other end and the FET of the 7th electric capacity connects the described 3rd respectively
Wherein one end of inductance and the positive pole of the 5th diode；The positive pole of the negative pole connection load of the 5th diode；It is described
The negative pole of the other end connection load of the 3rd inductance；The positive pole of wherein one end connection load of the 8th electric capacity, another termination
Ground；The positive pole of one end connection load of the 9th electric capacity, the negative pole of other end connection load；The electric current of the driving chip draws
Pin connects wherein one end of the source electrode of the FET, wherein one end of the 4th resistance and the 5th resistance respectively；Described
The other end of four resistance and the 5th resistance is grounded simultaneously；6th diodes in parallel in the FET drain electrode with
Between source electrode.
8. booting moment according to claim 5 impacts the protection circuit of overvoltage, it is characterised in that the rectification branch road bag
The 4th diode is included, the positive pole of the 4th diode connects the power taking point, and the power supply that negative pole connects the driving chip draws
Pin.
9. booting moment according to claim 6 impacts the protection circuit of overvoltage, it is characterised in that the filter branch bag
The 6th electric capacity is included, wherein one end of the 6th electric capacity connects with the power pins of the power taking point and the driving chip respectively
Connect, the other end is connected and is grounded with the test pin of the driving chip.
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| CN201710168599.3A CN106793349B (en) | 2017-03-21 | 2017-03-21 | The protection circuit of booting moment impact over-voltage |
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| CN201710168599.3A CN106793349B (en) | 2017-03-21 | 2017-03-21 | The protection circuit of booting moment impact over-voltage |
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| CN202455590U (en) * | 2011-12-06 | 2012-09-26 | 重庆瑞升康博电气有限公司 | High-power intelligent LED power supply driver with innovative framework |
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| CN204104190U (en) * | 2014-09-18 | 2015-01-14 | 深圳市圣诺科技有限公司 | LED drive power and LED display |
| CN105451409A (en) * | 2014-09-29 | 2016-03-30 | 惠州Tcl照明电器有限公司 | Straight tube LED power supply compatible with inductance/electronic ballast |
| CN206542607U (en) * | 2017-03-21 | 2017-10-03 | 惠州桑尼伟太阳能科技有限公司 | The protection circuit of booting moment impact overvoltage |
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