CN205912290U - Prevent electric backflash circuit under LED lamp - Google Patents
Prevent electric backflash circuit under LED lamp Download PDFInfo
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- CN205912290U CN205912290U CN201620718957.4U CN201620718957U CN205912290U CN 205912290 U CN205912290 U CN 205912290U CN 201620718957 U CN201620718957 U CN 201620718957U CN 205912290 U CN205912290 U CN 205912290U
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Abstract
The utility model provides a prevent electric backflash circuit under LED lamp, include: a prevent electric backflash circuit under LED lamp body, this body coupling of prevent electric backflash circuit under LED lamp peripheral circuit, an and input capacitance repid discharge module, input capacitance repid discharge module connect in the prevent electric backflash circuit under LED lamp body is used for working as after the output voltage of power supply electric capacity reaches a default, will the input voltage of peripheral circuit drops to zero fast. The utility model discloses a prevent electric backflash circuit under LED lamp has the pick -up current that can not change LED work chip under solving in the electric backflash problem to do not increase the activation time that the LED system normally went up when electricity, have and prevent electric backflash down and go up the advantage that electric activation time is short, user experience is good.
Description
Technical field
This utility model is related to LED lamp power supply circuits field, and more particularly, to one kind prevents electric backflash circuit under LED lamp.
Background technology
In existing led illuminating product electric process under power cutoff, occur once in a while LED lamp gone out after point again
Bright lower electricity backflash problem is so that user cannot preferable LED lamp lighting experience.
LED lamp, after power supply disconnection, enters under-voltage locking state because chip power supply is not enough, LED lamp extinguishes.Now defeated
The electric charge entering on electric capacity cin does not also discharge, the non-power-off of input voltage vin, and the operating die operating current of LED lamp is significantly
Reduce, lead to operating die recharged to starting voltage, operating die starts normal work and again lights LED lamp.With core
Piece task again, operating current increases, and operating die enters under-voltage locking state because of electricity shortage again, thus repeating above-mentioned mistake
Cheng Zaocheng lamp dodges, the thoroughly lower electricity of the voltage vin in input capacitance.
Under-voltage locking (under voltage lock out), often referred to as uvlo, under-voltage locking just refers to when input electricity
Force down when a certain value, power supply chip does not work, be in guard mode.
Existing scheme circuit as shown in figure 1, comprising: a high voltage supply mos pipe jfet, a charge control mos pipe m0, one
Diode d0, power supply capacitor cvcc and input capacitance electric discharge mos pipe m1.The leakage of wherein said high voltage supply mos pipe jfet
Pole and grid connect described peripheral circuit.The grid of described charge control mos pipe m0 and drain electrode connect described high voltage supply mos pipe
The source electrode of jfet.The anode of described diode d0 connects the source electrode of described charge control mos pipe m0.Described power supply capacitor cvcc
First end connects the negative electrode of described diode d0, the second end ground connection of described power supply capacitor cvcc.Described input capacitance electric discharge mos
The drain electrode of pipe m1 connects the source electrode of described high voltage supply mos pipe jfet, the source ground of described input capacitance electric discharge mos pipe m1.
Output voltage detection module 11 detect power supply capacitor cvcc voltage, when outside led operating die lower into under-voltage
After lock-out state, output voltage detection module 11 output voltage detection module 11 output switch control signal uvlo=1.Switch control
Signal uvlo high level processed opens compensating electric capacity electric discharge mos pipe m1, and by current-limiting resistance r1, high voltage supply mos pipe jfet
Source is discharged to input capacitance cin.During switch controlling signal uvlo=1, input capacitance cin is completely discharged, input voltage
Vin is that zero, led operating die cannot continue to charge to startup voltage continuous decrease.Because led operating die cannot normally open
Dynamic, LED lamp is always maintained at OFF state, it is to avoid lower electricity backflash.
The work wave of existing scheme as shown in Fig. 2 after system cut-off, input voltage vin slowly declines, led work core
Piece overturns as high level from low level power-down to under-voltage point, switch controlling signal uvlo.Due to the high electricity of switch controlling signal uvlo
Electric discharge to input capacitance cin during flat, input voltage vin quickly lower electricity, power supply capacitor cvcc voltage is under input voltage vin
First slow during fall rise, after also begin to decline because of electricity shortage.This process switch controlling signal uvlo exports
High level is until input voltage vin and led operating die thoroughly lower electricity.
Although currently existing scheme can solve the problems, such as the backflash of lower electricity, during electricity on led operating die, open
Close the starting current that control signal uvlo is led operating die between high period very big, and give the electricity of led operating die charging
Stream is less, and it is long to result in starting time when led system normally goes up electricity, brings poor led experience to user.
Content of the invention
For above-mentioned deficiency of the prior art, this utility model provides one kind to prevent electric backflash circuit under LED lamp, can
Do not change the starting current of led operating die under solving the problems, such as, thus not increasing led system normally go up electricity while electric backflash
When starting time, there is the backflash of anti-lower electricity and the electrifying startup time be short, Consumer's Experience is good.
To achieve these goals, this utility model provides one kind to prevent electric backflash circuit under LED lamp, comprising:
One prevents under LED lamp electric backflash circuit body, described prevents electric backflash circuit body under LED lamp from connecting a periphery electricity
Road；And
One input capacitance repid discharge module；
Described electric backflash circuit body is prevented under LED lamp to include:
One high voltage supply mos pipe, the drain and gate of described high voltage supply mos pipe connects described peripheral circuit；
One charge control mos pipe, the grid of described charge control mos pipe and drain electrode connect described high voltage supply mos pipe
Source electrode；
One diode, the anode of described diode connects the source electrode of described charge control mos pipe；
One power supply capacitor, the first end of described power supply capacitor connects the negative electrode of described diode, and the of described power supply capacitor
Two end ground connection；
One input capacitance electric discharge mos pipe, the drain electrode of described input capacitance electric discharge mos pipe connects described high voltage supply mos pipe
Source electrode, described input capacitance discharges the source ground of mos pipe；With
One output voltage detection module, the input of described output voltage detection module connects the negative electrode of described diode；
Described input capacitance repid discharge module is connected to the outfan of described output voltage detection module and described input
Between the grid of electric capacity electric discharge mos pipe, for after the output voltage of described power supply capacitor reaches a preset value, by described periphery
The input voltage of circuit drops quickly to zero.
Preferably, described electric backflash circuit body is prevented under LED lamp also to include: a pull-up resistor, described pull-up resistor is even
It is connected between the drain and gate of described charge control mos pipe.
Preferably, described electric backflash circuit body is prevented under LED lamp also to include: a current-limiting resistance, described current-limiting resistance is even
It is connected between the source electrode of described high voltage supply mos pipe and the drain electrode of described input capacitance electric discharge mos pipe.
Preferably, described input capacitance repid discharge module includes:
One compensating electric capacity charging module, the first input end of described compensating electric capacity charging module connects the moon of described diode
Pole, the second input of described compensating electric capacity charging module connects the outfan of described output voltage detection module；
One compensating electric capacity voltage detection module, the first input end connection of described compensating electric capacity voltage detection module is described defeated
Go out the outfan of voltage detection module, the outfan of described compensating electric capacity voltage detection module connects described compensating electric capacity charging mould
3rd input of block and the grid of described input capacitance electric discharge mos pipe；
One compensating electric capacity electric discharge mos pipe, the grid of described compensating electric capacity electric discharge mos pipe connects described output voltage and detects mould
The outfan of block, the drain electrode of described compensating electric capacity electric discharge mos pipe connects the second input of described compensating electric capacity voltage detection module
End, the source ground of described compensating electric capacity electric discharge mos pipe；And
One compensating electric capacity, described compensating electric capacity first end connects the drain electrode of described compensating electric capacity electric discharge mos pipe and described benefit
Repay the outfan of capacitance charging module, described compensating electric capacity second end ground connection.
Preferably, described compensating electric capacity charging module includes:
One first nor gate, the first input end of described first nor gate connects the output of described output voltage detection module
End；
One phase inverter, the input of described phase inverter connects the outfan of described compensating electric capacity voltage detection module, described
The outfan of phase inverter connects the second input of described first nor gate；And
One charge switch mos pipe, the drain electrode of described charge switch mos pipe connects the negative electrode of described diode, described charging
The grid of switch mos pipe connects the outfan of described first nor gate, and the source electrode of described charge switch mos pipe connects described compensation
Electric capacity.
Preferably, described compensating electric capacity voltage detection module includes:
One comparator, the normal phase input end of described comparator connects the drain electrode of described compensating electric capacity electric discharge mos pipe, described ratio
Connect a reference voltage input terminal compared with the inverting input of device；
One d trigger, the d end ground connection of described d trigger, the cp end of described d trigger connects the output of described comparator
End, the reset terminal of described d trigger connects the outfan of described output voltage detection module；And
One second nor gate, the q end of the first input end described d trigger of connection of described second nor gate, described second
Second input of nor gate connects the outfan of described output voltage detection module, and the outfan of described second nor gate connects
Described compensating electric capacity charging module and the grid of described input capacitance electric discharge mos pipe.
Preferably, described peripheral circuit includes:
One alternating current power supply；
One rectifier bridge, the input of described rectifier bridge connects described alternating current power supply；And
One input capacitance, the first end of described input capacitance connects the outfan of described rectifier bridge, described input capacitance
Second end ground connection.
Preferably, peripheral circuit also includes a switch, described switch be series at described alternating current power supply and described rectifier bridge it
Between.
This utility model is due to employing above technical scheme so as to have the advantages that
Input capacitance repid discharge module is used for after the output voltage of power supply capacitor reaches a preset value, by peripheral circuit
Input voltage drop quickly to zero, while realizing electric backflash under solving the problems, such as, do not change and outer connect opening of led operating die
Streaming current, thus not increasing the starting time that system normally goes up electricity, solves in the normal startup of LED lamp system in anti-backflash circuit
The problem of electric overlong time.Charge control mos pipe is as the control pipe of high-voltage charging path break-make.The employing of current-limiting resistance, real
Show the current limliting when input capacitance electric discharge mos pipe is drop-down to high voltage supply mos pipe source electrode, prevent pull-down current excessive.Two poles
Pipe using achieving one-way conduction, when preventing input voltage to be less than output voltage, produce electric current anti-to input from outfan
Filling, producing anti-sink current, thus causing power supply capacitor to input capacitance back discharge.Power supply capacitor is used for external led work
Make chip power supply.Output voltage detection module is used for the voltage status that detection judges output voltage.Input capacitance electric discharge mos pipe is made
It is the drop-down mos pipe to high voltage supply mos pipe source electrode, for input electric discharge.Compensating electric capacity voltage detection module is used for judging
The whether enough height of voltage in compensating electric capacity, determine whether to terminate precharge.Compensating electric capacity electric discharge mos pipe is as output voltage
Reset mos pipe to the drop-down electric discharge of compensating electric capacity after lower electricity.Compensating electric capacity is plug-in compensating electric capacity, by the employing of compensating electric capacity
One kind of the present utility model is made to prevent electric backflash circuit under LED lamp from, when applying High Power Factor led to drive application, can achieve
The advantage of the low total harmonic distortion of High Power Factor.Compensating electric capacity charging module is used for entering line precharge to compensating electric capacity.This practicality
New one kind prevents electric backflash circuit under LED lamp, and the compensating electric capacity after starting in external led operating die is pre-charged rank
Section solves the problems, such as electric backflash under led circuit to the mode of input capacitance electric discharge.Compared with existing scheme, due to starting current pole
Little, the starting time of system can be greatly shortened, improve the led lighting experience of user.
Brief description
Fig. 1 is a kind of existing structural representation preventing electric backflash circuit under LED lamp；
Fig. 2 is a kind of existing work wave comparison diagram preventing electric backflash circuit under LED lamp；
A kind of structural representation preventing electric backflash circuit under LED lamp of Fig. 3 this utility model embodiment；
Fig. 4 is the structural representation of the compensating electric capacity charging module of this utility model embodiment；
Fig. 5 is the structural representation of the compensating electric capacity voltage detection module of this utility model embodiment；
Fig. 6 is a kind of work wave comparison diagram preventing electric backflash circuit under LED lamp of this utility model embodiment.
Specific embodiment
Below according to accompanying drawing 3-6, provide preferred embodiment of the present utility model, and be described in detail, enable preferably
Understand function of the present utility model, feature.
Refer to Fig. 3, one kind of the present utility model prevents electric backflash circuit under LED lamp, comprising: one prevents electricity under LED lamp
Backflash circuit body 1 and an input capacitance repid discharge module 2, wherein, prevent electric backflash circuit body 1 under LED lamp from connecting one
Peripheral circuit 3, input capacitance repid discharge module 2 is used for after the output voltage of power supply capacitor cvcc reaches a preset value, will
The input voltage of peripheral circuit 3 drops quickly to zero, while realizing electric backflash under solving the problems, such as, does not change and connects led work outward
Making the starting current of chip, thus not increasing the starting time that system normally goes up electricity, solving LED lamp system in anti-backflash circuit
The long problem of normal startup power-on time.
In the present embodiment, prevent electric backflash circuit body 1 under LED lamp from including: a high voltage supply mos pipe jfet, a charging
Mos pipe m0, a pull-up resistor r0, a diode d0, power supply capacitor cvcc, a current-limiting resistance r1, an input capacitance is controlled to put
Electric mos pipe m2 and an output voltage detection module 11.
Wherein, the drain and gate of high voltage supply mos pipe jfet connects peripheral circuit 3, receives input voltage vin.
Charge control mos pipe m0 connects as the control pipe of high-voltage charging path break-make, the drain electrode of charge control mos pipe m0
The source electrode of high voltage supply mos pipe jfet, the grid of charge control mos pipe m0 passes through a pull-up resistor r0 and connects high voltage supply mos
The source electrode of pipe jfet.The employing of current-limiting resistance r0 is it is achieved that work as input capacitance electric discharge mos pipe m2 to high voltage supply mos pipe jfet
Current limliting when source electrode is drop-down, prevents pull-down current excessive.
The anode of diode d0 connects the source electrode of charge control mos pipe m0.Diode d0 using achieving one-way conduction,
When preventing input voltage vin to be less than output voltage vcc, produce electric current and fill to input is counter from outfan, produce anti-sink current, from
And cause power supply capacitor cvcc to input capacitance cin back discharge.
The first end of power supply capacitor cvcc connects the negative electrode of diode d0, the second end ground connection of power supply capacitor cvcc.Power supply
Electric capacity cvcc is used for powering to external led operating die.
The first end of current-limiting resistance r1 connects the source electrode of high voltage supply mos pipe jfet, and second end of current-limiting resistance r1 connects
The drain electrode of input capacitance electric discharge mos pipe m2.
The input of output voltage detection module 11 connects the negative electrode of diode d0, the output of output voltage detection module 11
End output switch control signal uvlo.
Output voltage detection module 11 is used for the voltage status that detection judges output voltage vcc.
Input capacitance repid discharge module 2 is connected to the outfan of output voltage detection module 11 and input capacitance is discharged
Between the grid of mos pipe m2.
The source ground of input capacitance electric discharge mos pipe m2, input capacitance electric discharge mos pipe m2 manages as to high voltage supply mos
The drop-down mos pipe of jfet source electrode, for input electric discharge.
In the present embodiment, input capacitance repid discharge module 2 includes: a compensating electric capacity charging module 21, a compensating electric capacity
Voltage detection module 22, a compensating electric capacity electric discharge mos pipe m1 and compensating electric capacity ccomp.
Wherein, the first input end of compensating electric capacity charging module 21 connects the negative electrode of diode d0, receives output voltage
Vcc, the second input of compensating electric capacity charging module 21 connects the outfan of output voltage detection module 11, receives output voltage
The switch controlling signal uvlo that detection module 11 outfan sends.
The first input end of compensating electric capacity voltage detection module 22 connects the outfan of output voltage detection module 11, receives
Switch controlling signal uvlo；The 3rd of the outfan connection compensating electric capacity charging module 21 of compensating electric capacity voltage detection module 22 is defeated
Enter end and the grid of input capacitance electric discharge mos pipe m2, and export compensating electric capacity charging testing result comprdy.
Compensating electric capacity voltage detection module 22 is used for judging the whether enough height of voltage in compensating electric capacity ccomp, so that it is determined that
Whether terminate to be pre-charged.
The grid of compensating electric capacity electric discharge mos pipe m1 connects the outfan of output voltage detection module 11, receives on-off control
Signal uvlo；The drain electrode of compensating electric capacity electric discharge mos pipe m1 connects the second input of compensating electric capacity voltage detection module 22；Compensate
The source ground of electric capacity electric discharge mos pipe m1.Compensating electric capacity electric discharge mos pipe m1 as under output voltage vcc electricity after to compensating electric capacity
The reset mos pipe of the drop-down electric discharge of ccomp.
Compensating electric capacity ccomp first end (top crown) connects the drain electrode of compensating electric capacity electric discharge mos pipe m1 and compensating electric capacity is filled
The outfan of electric module 21, compensating electric capacity ccomp second end is grounded, and the voltage in compensating electric capacity ccomp is compensating electric capacity voltage
comp.
Compensating electric capacity ccomp is plug-in compensating electric capacity, by compensating electric capacity ccomp using making of the present utility model one
Kind prevent under LED lamp electric backflash circuit when applying High Power Factor led to drive application, the low total harmonic wave of achievable High Power Factor
The advantage of distortion.
In this utility model, when the output voltage of power supply capacitor cvcc reaches the startup voltage of external led operating die
After the preset value of size, input capacitance repid discharge module 2 starts compensating electric capacity ccomp is charged, and charges in compensating electric capacity
Stage discharges mos pipe m2 to high voltage supply mos pipe jfet electric discharge by input capacitance, thus realizing the quick of input voltage vin
It is pulled down to zero.
In the present embodiment, peripheral circuit 3 includes: alternating current power supply ac, a rectifier bridge 31, switch s0 and an input capacitance
cin.
Wherein, the input of rectifier bridge 31 connects alternating current power supply ac.
Switch s0 is series between alternating current power supply ac and rectifier bridge 31.
The first end (top crown) of input capacitance cin connects the outfan of rectifier bridge 31 and high voltage supply mos pipe jfet's
Drain electrode, second end (bottom crown) of input capacitance cin connects the grid of high voltage supply mos pipe jfet and is grounded, input capacitance cin
On voltage be input voltage vin.
Refer to Fig. 3, Fig. 4, compensating electric capacity charging module 21 includes: one first nor gate 211, a phase inverter 212 and
Charge switch mos pipe 213.
Wherein, the first input end of the first nor gate 211 connects the outfan of output voltage detection module 11, and receives defeated
Go out the switch controlling signal uvlo of the outfan output of voltage detection module 11.
The input of phase inverter 212 connects the outfan of compensating electric capacity voltage detection module 22, and receives compensating electric capacity electricity
Compensating electric capacity charging testing result comprdy of the outfan output of pressure detection module 22；The outfan of phase inverter 212 connects the
Second input of one nor gate 211.
The drain electrode of charge switch mos pipe 213 connects the negative electrode of diode d0, and receives output voltage vcc, charge switch
The grid of mos pipe 213 connects the outfan of the first nor gate 211, and the source electrode of charge switch mos pipe 213 connects compensating electric capacity
ccomp.
Compensating electric capacity charging module 21 can complete following logic function:
As switch controlling signal uvlo=1, the charging path of compensating electric capacity ccomp disconnects；Work as switch controlling signal
Uvlo=0, and during compensating electric capacity charging testing result comprdy=1, the charging path conducting of compensating electric capacity ccomp.
That is, compensating electric capacity charging module 21 enables in switch controlling signal uvlo=0, filled according to compensating electric capacity
Electro-detection result comprdy determines whether that the charging continuing compensating electric capacity ccomp is charged or disconnects with compensating electric capacity ccomp is led to
Road.
Compensating electric capacity charging module 21 is used for entering line precharge to compensating electric capacity ccomp.
Refer to Fig. 3, Fig. 5, compensating electric capacity voltage detection module 22 includes: a comparator 221, a d trigger 222 and
Second nor gate 223.
Wherein, the normal phase input end of comparator 221 connects the drain electrode of compensating electric capacity electric discharge mos pipe m1；Comparator 221 anti-
Phase input connects a reference voltage input terminal.
The d end ground connection of d trigger 222, the cp end of d trigger 222 connects the outfan of comparator 221, d trigger 222
Reset terminal connect the outfan of output voltage detection module 11, and opening of receiving that output voltage detection module 11 outfan sends
Close control signal uvlo.
The first input end of the second nor gate 223 connects the q end of d trigger 222, the second input of the second nor gate 223
End connects the outfan of output voltage detection module 11, and receives switch controlling signal uvlo；The outfan of the second nor gate 223
Connect compensating electric capacity charging module 21 and the grid of input capacitance electric discharge mos pipe m2, and export compensating electric capacity charging testing result
comprdy.
The effect of compensating electric capacity voltage detection module 22 is: whether the voltage in real-time detection compensating electric capacity ccomp reaches
To sufficiently high, and constantly export compensating electric capacity charging testing result comprdy=0 and lock reaching this enough height.
Compensating electric capacity voltage detection module 22 can complete following logic function:
As switch controlling signal uvlo=1, d trigger 222 resets and exports q=0, compensating electric capacity charging testing result
Comprdy=0.As switch controlling signal uvlo=0, comparator 221 is by the compensating electric capacity voltage in compensating electric capacity ccomp
Comp is compared with internal reference voltage vref, and when compensating electric capacity voltage comp is higher, comparator 221 exports rising edge, and d triggers
Device 222 output q=1 and locking, compensating electric capacity charging testing result comprdy=0.
Refer to Fig. 3, operation principle of the present utility model is as follows:
After switch s0 disconnects, input voltage vin slowly declines, output voltage vcc under-voltage point quilt because electricity shortage drops to
Output voltage detection module 11 detects and output switch control signal uvlo=1.Switch controlling signal uvlo high level signal
Drive compensating electric capacity electric discharge mos pipe m1 to pull down to zero to the electric discharge of compensating electric capacity ccomp, and it is right to shield compensating electric capacity charging module 21
The charging of compensating electric capacity ccomp, the high level pair of the switch controlling signal uvlo of voltage detection module 11 outfan output simultaneously
Compensating electric capacity voltage detection module 22 resets output compensating electric capacity charging testing result comprdy=0 that resets.
External led operating die due to power supply capacitor cvcc enters under-voltage locking state, and operating current is substantially reduced,
Power supply capacitor cvcc of output voltage vcc is recharged.Start voltage when output voltage vcc rises to led operating die
It is output voltage detection module 11 during vcc_st to detect and output switch control signal uvlo=0.Now compensating electric capacity electric discharge
Mos pipe m1 stopping is drop-down to compensating electric capacity ccomp, and compensating electric capacity charging module 21 module starts pre- to compensating electric capacity ccomp
Charge, compensating electric capacity voltage detection module 22 exports compensating electric capacity charging testing result comprdy=1 and real-time detection compensates electricity
Hold the voltage on ccomp.When the voltage in compensating electric capacity ccomp be compensated capacitance voltage detection module 22 detect sufficiently high
When, export compensating electric capacity charging testing result comprdy=0, and control and compensation capacitance charging module 21 stops to compensating electric capacity
The charging of ccomp.
It is compensated capacitance charging module 21 charging stage, compensating electric capacity charging testing result in compensating electric capacity ccomp
Comprdy=1 drive input capacitance electric discharge mos pipe m2 to input capacitance cin discharge, by arrange current-limiting resistance r1 it is ensured that
Electric charge in input capacitance cin is discharged by compensating electric capacity comp pre-charging stage.
Due to being zero after input voltage vin electric discharge, output voltage vcc is also gradually lower electric, so that system thoroughly lower electricity.Whole
The LED lamp that individual process LED lamp operating die connects is all without again being lighted.
One kind of the present utility model prevents electric backflash circuit, the benefit after starting under LED lamp in external led operating die
Repay the mode that electric capacity ccomp pre-charging stage discharges to input capacitance cin and solve the problems, such as electric backflash under led circuit.
The starting time of system compared with existing scheme, because starting current is minimum, can be greatly shortened, improve user
Led lighting experience.
The starting current of this utility model circuit realiration external led operating die is minimum, refers to fast to input capacitance vin
Speed electric discharge is in compensating electric capacity ccomp pre-charging stage, and now external led operating die has successfully gone up electricity, and discharge current is not
Affect the starting current in external led operating die power up, start led work such that it is able to realize minimum starting current
Chip, comparatively, existing scheme is just discharged to input capacitance vin in external led operating die power up phase, therefore starts electricity
Stream is very big.
Refer to Fig. 6, input voltage vin slowly declines after a loss of power, and output voltage vcc also begins to down because of electricity shortage
Fall.After output voltage vcc drops to under-voltage point, switch controlling signal uvlo overturns as high level, compensating electric capacity voltage simultaneously
Comp is discharged and pulls down to zero.Output voltage vcc re-powers and starts voltage vcc_st to led operating die, and on-off control is believed
Number uvlo overturns as low level, and testing result comprdy of compensating electric capacity charging simultaneously overturns as high level, compensating electric capacity voltage
Comp voltage starts to charge up slow rising.When compensating electric capacity charging testing result comprdy is high level, input voltage vin is fast
The lower electricity of speed is simultaneously pulled down to zero.It is pulled down with input voltage vin, output voltage vcc also begins to decline because of electricity shortage.Mend simultaneously
Repay capacitance voltage comp slowly rise triggering compensating electric capacity charging testing result comprdy overturn to low level.Led operating die
Start normal work, but the LED lamp that input voltage vin is the connection of zero, led operating die will not be lit, output voltage vcc will
Continuous decrease is to zero.
Above record, preferred embodiment only of the present utility model, it is not limited to scope of the present utility model, this
Above-described embodiment of utility model can also make a variety of changes.I.e. every claims according to this utility model application and
Simple, equivalence changes and modification that description is made, fall within the claims of this utility model patent.
Claims (8)
1. one kind prevents electricity backflash circuit under LED lamp it is characterised in that including:
One prevents under LED lamp electric backflash circuit body, described prevents electric backflash circuit body under LED lamp from connecting a peripheral circuit；
And
One input capacitance repid discharge module；
Described electric backflash circuit body is prevented under LED lamp to include:
One high voltage supply mos pipe, the drain and gate of described high voltage supply mos pipe connects described peripheral circuit；
One charge control mos pipe, the grid of described charge control mos pipe and drain electrode connect the source electrode of described high voltage supply mos pipe；
One diode, the anode of described diode connects the source electrode of described charge control mos pipe；
One power supply capacitor, the first end of described power supply capacitor connects the negative electrode of described diode, the second end of described power supply capacitor
Ground connection；
One input capacitance electric discharge mos pipe, the drain electrode of described input capacitance electric discharge mos pipe connects the source of described high voltage supply mos pipe
Pole, the source ground of described input capacitance electric discharge mos pipe；With
One output voltage detection module, the input of described output voltage detection module connects the negative electrode of described diode；
Described input capacitance repid discharge module is connected to the outfan of described output voltage detection module and described input capacitance
Between the grid of electric discharge mos pipe, for after the output voltage of described power supply capacitor reaches a preset value, by described peripheral circuit
Input voltage drop quickly to zero.
2. one kind according to claim 1 prevents under LED lamp electric backflash circuit it is characterised in that described prevent under LED lamp
Electric backflash circuit body also includes: a pull-up resistor, and described pull-up resistor is connected to drain electrode and the grid of described charge control mos pipe
Between pole.
3. one kind according to claim 2 prevents under LED lamp electric backflash circuit it is characterised in that described prevent under LED lamp
Electric backflash circuit body also includes: a current-limiting resistance, and described current-limiting resistance is connected to source electrode and the institute of described high voltage supply mos pipe
State between the drain electrode of input capacitance electric discharge mos pipe.
4. one kind according to claim 3 prevents under LED lamp electric backflash circuit it is characterised in that described input capacitance is fast
Fast discharge module includes:
One compensating electric capacity charging module, the first input end of described compensating electric capacity charging module connects the negative electrode of described diode,
Second input of described compensating electric capacity charging module connects the outfan of described output voltage detection module；
One compensating electric capacity voltage detection module, the first input end of described compensating electric capacity voltage detection module connects described output electricity
The outfan of pressure detection module, the outfan of described compensating electric capacity voltage detection module connects described compensating electric capacity charging module
3rd input and the grid of described input capacitance electric discharge mos pipe；
One compensating electric capacity electric discharge mos pipe, the grid of described compensating electric capacity electric discharge mos pipe connects described output voltage detection module
Outfan, the drain electrode of described compensating electric capacity electric discharge mos pipe connects the second input of described compensating electric capacity voltage detection module, institute
State the source ground of compensating electric capacity electric discharge mos pipe；And
One compensating electric capacity, described compensating electric capacity first end connects drain electrode and the described compensation electricity of described compensating electric capacity electric discharge mos pipe
The outfan of capacity charge module, described compensating electric capacity second end ground connection.
5. one kind according to claim 4 prevents under LED lamp electric backflash circuit it is characterised in that described compensating electric capacity is filled
Electric module includes:
One first nor gate, the first input end of described first nor gate connects the outfan of described output voltage detection module；
One phase inverter, the input of described phase inverter connects the outfan of described compensating electric capacity voltage detection module, described anti-phase
The outfan of device connects the second input of described first nor gate；And
One charge switch mos pipe, the drain electrode of described charge switch mos pipe connects the negative electrode of described diode, described charge switch
The grid of mos pipe connects the outfan of described first nor gate, and the source electrode of described charge switch mos pipe connects described compensation electricity
Hold.
6. one kind according to claim 5 prevents under LED lamp electric backflash circuit it is characterised in that described compensating electric capacity is electric
Pressure detection module includes:
One comparator, the normal phase input end of described comparator connects the drain electrode of described compensating electric capacity electric discharge mos pipe, described comparator
Inverting input connect a reference voltage input terminal；
One d trigger, the d end ground connection of described d trigger, the cp end of described d trigger connects the outfan of described comparator, institute
The reset terminal stating d trigger connects the outfan of described output voltage detection module；And
One second nor gate, the q end of the first input end described d trigger of connection of described second nor gate, described second or non-
Second input of door connects the outfan of described output voltage detection module, and the outfan connection of described second nor gate is described
Compensating electric capacity charging module and the grid of described input capacitance electric discharge mos pipe.
7. the one kind according to any one of claim 1-6 prevents under LED lamp electric backflash circuit it is characterised in that described outer
Enclose circuit to include:
One alternating current power supply；
One rectifier bridge, the input of described rectifier bridge connects described alternating current power supply；And
One input capacitance, the outfan of the first end described rectifier bridge of connection of described input capacitance, the second of described input capacitance
End ground connection.
8. one kind according to claim 7 prevents under LED lamp electric backflash circuit it is characterised in that peripheral circuit also includes
One switch, described switch is series between described alternating current power supply and described rectifier bridge.
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| CN201620718957.4U CN205912290U (en) | 2016-07-08 | 2016-07-08 | Prevent electric backflash circuit under LED lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107172769A (en) * | 2017-07-26 | 2017-09-15 | 无锡麟力科技有限公司 | Prevent electric backflash circuit under LED light device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107172769A (en) * | 2017-07-26 | 2017-09-15 | 无锡麟力科技有限公司 | Prevent electric backflash circuit under LED light device |
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