CN207150898U - Prevent electric backflash circuit under LED light device - Google Patents
Prevent electric backflash circuit under LED light device Download PDFInfo
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- CN207150898U CN207150898U CN201720919329.7U CN201720919329U CN207150898U CN 207150898 U CN207150898 U CN 207150898U CN 201720919329 U CN201720919329 U CN 201720919329U CN 207150898 U CN207150898 U CN 207150898U
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Abstract
The utility model discloses one kind to prevent electric backflash circuit under LED light device, it is related to LED string technical field, including AC power supply module, rectifier bridge stack, LED string, for controlling the constant-current drive circuit of LED current, start resistance and two filtering voltage regulation electric capacity C1, C2, filtering voltage regulation electric capacity is connected to after arrangement bridge heap and constant-current drive circuit power supply VCC ends, the startup resistance provides operating current for constant-current drive circuit, described startup resistance one end connection constant-current drive circuit power supply and filtering capacitance of voltage regulation C1, the other end connects a Charge back flow prevented on filtering voltage regulation electric capacity C1 to the anti-return diode D1 for starting resistance.After power switch disconnects, start resistance no longer to power for constant-current drive circuit, after VCC voltages drop below constant-current drive circuit shut-off voltage, constant-current drive circuit is stopped and no longer restarted, even if the now non-power-off of line voltage VIN, LED is also no longer lighted.So as to solve LED flicker problems, good usage experience is created for user.
Description
Technical field
The present invention relates to LED string technical field, and in particular to one kind prevents electric backflash circuit under LED light device.
Background technology
Existing LED illumination product occurs that LED has been gone out afterwards again once in a while during power switch disconnects
Light, then go out again, after being repeated several times, LED is just no longer lighted so that user generates bad usage experience.
Existing LED light device all controls the constant current hold by LED lamp bead by constant-current drive circuit.In general
Constant-current drive circuit is powered by startup resistance to power supply, and constant-current drive circuit power supply termination capacitor carries out voltage stabilizing and filtering.Work as electricity
When source VCC voltages rise above operating voltage VON, constant-current drive circuit work；When power supply VCC voltages drop below shut-off
During voltage VOFF, constant-current drive circuit is stopped, and wherein VON is more than VOFF.
Traditional LED illumination drive device circuit is illustrated in fig. 1 shown below, and AC power is after gap bridge heap rectification on electric capacity C1
Produce AC line voltage VIN.After power switch disconnects, the electric charge of system consumption C1 storages.Due to electricity shortage, C1 energy storage is held
Continuous to reduce, line voltage VIN declines, and the electric current provided by starting resistance R1 constant-current drive circuit power end VCC reduces.When
Constant-current drive circuit is stopped after VCC voltages drop under shut-off voltage VOFF, and LED is gone out, and now C1 still has storage
Electric charge does not release, the non-power-off of line voltage VIN.Because constant-current drive circuit is stopped, the electric current of post consumption is far smaller than
The electric current consumed during work, line voltage VIN charge to operating voltage VON again by resistance R1 is started to VCC ends electric capacity C2, permanent
Flow drive circuit task and lightening LED lamp again.With constant-current drive circuit, task, the electric current increase of consumption, constant current are driven again
Dynamic circuit VCC terminal voltages decline and are stopped because of electricity shortage again, and LED is gone out.Constant-current drive circuit is so repeatedly several
It is secondary be stopped after start the process of work again, cause LED to flash, until line voltage VIN power-off, it is impossible to again
Constant-current drive circuit is set to start work.Fig. 2 is traditional LED light device circuit waveform after power switch shut-off.
The content of the invention
The technical problem to be solved in the present invention is that solve above-mentioned the deficiencies in the prior art, there is provided one kind prevents LED illumination from filling
Put lower electric backflash circuit.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：One kind prevents that electricity returns under LED light device
Lightning road, including AC power supply module, rectifier bridge stack, LED string, the constant-current drive circuit for controlling LED string electric current, open
Dynamic resistance and two filtering voltage regulations electric capacity C1, C2, filtering voltage regulation electric capacity is connected to after rectifier bridge stack and constant current driving electricity
Road power supply VCC ends, the power supply of line voltage and constant-current drive circuit to filtering voltage regulation electric capacity C1 positive terminals carry out voltage stabilizing and filtering,
The startup resistance provides operating current for constant-current drive circuit, and described startup resistance one end connects filtering capacitance of voltage regulation C2, separately
One end, which connects one, prevents the Charge back flow of constant-current drive circuit power end to the anti-return diode D1 of startup resistance.
One kind as the present invention is preferred, the positive pole for starting resistance connection anti-return diode D1 and rectifier bridge stack
Positive pole, anti-return diode D1 negative pole connection filtering voltage regulation electric capacity C1 positive pole.
As another preferred structure of the present invention, the negative pole for starting resistance connection anti-return diode D1, prevent back
Flow diode D1 positive pole connection AC power, the positive pole of filtering voltage regulation electric capacity C1 connection rectifier bridge stacks.
From above-mentioned technical proposal it can be seen that the present invention has advantages below：Start resistance R1 to provide for constant-current drive circuit
Operating current, the electric capacity C2 for being connected to constant-current drive circuit VCC ends are filtered and voltage stabilizing to VCC voltages, connect on-Line Voltage
The electric capacity C1 at VIN ends provides electric current for LED string.After power switch disconnects, anti-return diode D1 cathode voltages drop to
0V, just there is no electric current to be powered by starting resistance R1 for constant-current drive circuit again, under constant-current drive circuit power supply VCC voltages are quick
Drop.After VCC voltages drop below constant-current drive circuit shut-off voltage, constant-current drive circuit is stopped and no longer restarted,
Even if the now non-power-off of line voltage VIN, LED is also no longer lighted.So as to solve LED flicker problems, created for user good
Good usage experience.
Brief description of the drawings
Fig. 1 is the LED illumination drive device circuit of prior art；
Fig. 2 is waveform after power switch shut-off in circuit in Fig. 1；
Fig. 3 is the circuit theory diagrams of the first embodiment of the present invention；
Fig. 4 is waveform after power switch shut-off in circuit in Fig. 3；
Fig. 5 is the circuit theory diagrams of second of embodiment of the present invention.
Embodiment
The embodiment of the present invention is elaborated below in conjunction with accompanying drawing
Embodiment 1:As shown in figure 3, one kind prevents electric backflash circuit under LED light device, including it is AC power supply module, whole
Flow bridge heap, LED string, the constant-current drive circuit for controlling LED current, startup resistance R1 and two filtering voltage regulation electric capacity
C1, C2, constant-current drive circuit are used for the electric current for controlling LED string, and constant-current drive circuit includes high power metal-oxide-semiconductor and the Gao Gong
The drive circuit of rate metal-oxide-semiconductor, high power MOS is carried out by the conducting resistance and dutycycle grid current that control high power MOS
It is turned on or off, is ripe prior art here, herein without repeating so as to control LED electric current.Filtering voltage regulation
Electric capacity is connected to after bridge heap and constant-current drive circuit power supply VCC ends, to line voltage VIN and the power supply of constant-current drive circuit
VCC carries out voltage stabilizing and filtering, and the startup resistance R1 provides operating current for constant-current drive circuit, starts the connection of resistance R1 one end
Filtering capacitance of voltage regulation C2, start resistance R1 other ends connection anti-return diode D1 negative pole, anti-return diode D1 positive pole
Connect AC power, the positive pole of filtering voltage regulation electric capacity C1 connection rectifier bridge stacks.
It is connected to the diode D1 at alternating current input power supplying end and starts resistance R1 and provides operating current for constant-current drive circuit,
The electric capacity C2 for being connected to constant-current drive circuit VCC ends is filtered and voltage stabilizing to VCC voltages.After power switch disconnects, prevent back
Stream diode D1 cathode voltage drops to 0V, is disconnected by the supply access for starting resistance R1, just again no electric current by opening
Dynamic resistance R1 powers for constant-current drive circuit, constant-current drive circuit power supply VCC terminal voltage rapid decreases.When VCC voltages drop to
After constant-current drive circuit shut-off voltage VOFF, constant-current drive circuit is stopped and no longer restarted, even if now line voltage
The non-power-off of VIN, LED are also no longer lighted.Fig. 4 is that the circuit of embodiment of the present invention is had no progeny waveform in switch.
Embodiment 2：As shown in figure 5, one kind prevents electric backflash circuit under LED light device, including it is AC power supply module, whole
Flow bridge heap, LED string, the constant-current drive circuit for controlling LED current, startup resistance R1 and two filtering voltage regulation electric capacity
C1, C2, constant-current drive circuit are used for the electric current for controlling LED string, and constant-current drive circuit includes high power metal-oxide-semiconductor and the Gao Gong
The drive circuit of rate metal-oxide-semiconductor, high power MOS is carried out by the conducting resistance and dutycycle grid current that control high power MOS
It is turned on or off, is ripe prior art here, herein without repeating so as to control LED electric current.Filtering voltage regulation
Electric capacity is connected to after arrangement bridge heap and constant-current drive circuit power supply VCC ends, to line voltage and the power supply of constant-current drive circuit
Voltage stabilizing and filtering are carried out, starts resistance R1 and provides operating current for constant-current drive circuit, starts the connection voltage stabilizing of resistance R1 one end
Filter capacitor C2, start one anti-return diode D1 of resistance other end connection positive pole and the positive pole of rectifier bridge stack, prevent back
Flow diode D1 negative pole connection filtering voltage regulation voltage C1.
The startup resistance R1 for being connected to bridge heap positive output end provides operating current, diode D1 connections for constant-current drive circuit
Between bridge heap positive output end and line voltage VIN storage capacitors C1 anode, the electricity at constant-current drive circuit power supply VCC ends is connected to
VCC voltages are filtered appearance C2 and voltage stabilizing.After power switch disconnects, anti-return diode D1 cathode voltage drops to
0V, disconnected by the supply access for starting resistance R1, just there is no electric current to be powered by starting resistance R1 for constant-current drive circuit again,
Constant-current drive circuit power supply VCC voltage rapid decreases.It is permanent after VCC voltages drop below constant-current drive circuit shut-off voltage
Stream drive circuit is stopped and no longer restarted, even if the now non-power-off of line voltage VIN, LED are also no longer lighted.
To sum up, LED drive device circuit of the invention, can avoid completely power switch turn off after constant-current drive circuit again
Start, so as to solve LED flicker problems, good usage experience is created for user.
Claims (3)
1. one kind prevents electric backflash circuit under LED light device, including AC power supply module, rectifier bridge stack, LED string, it is used for
Control the constant-current drive circuit of LED string electric current, start resistance and two filtering voltage regulations electric capacity C1, C2, filtering voltage regulation electric capacity
Be connected to after rectifier bridge stack and constant-current drive circuit power supply VCC ends, line voltage to filtering voltage regulation electric capacity C1 positive terminals and
The power supply of constant-current drive circuit carries out voltage stabilizing and filtering, and the startup resistance provides operating current for constant-current drive circuit, and it is special
Sign is：Startup resistance one end connection filtering capacitance of voltage regulation C2, the other end, which connects one, prevents constant-current drive circuit power supply
The Charge back flow at end extremely starts the anti-return diode D1 of resistance.
2. according to claim 1 prevent electric backflash circuit under LED light device, it is characterised in that：The startup resistance
Connect anti-return diode D1 positive pole and the positive pole of rectifier bridge stack, anti-return diode D1 negative pole connection filtering voltage regulation electric capacity
C1 positive pole.
3. according to claim 1 prevent electric backflash circuit under LED light device, it is characterised in that：The startup resistance
Connect anti-return diode D1 negative pole, anti-return diode D1 positive pole connection AC power, the C1 connections of filtering voltage regulation electric capacity
The positive pole of rectifier bridge stack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720919329.7U CN207150898U (en) | 2017-07-26 | 2017-07-26 | Prevent electric backflash circuit under LED light device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720919329.7U CN207150898U (en) | 2017-07-26 | 2017-07-26 | Prevent electric backflash circuit under LED light device |
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| CN207150898U true CN207150898U (en) | 2018-03-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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- 2017-07-26 CN CN201720919329.7U patent/CN207150898U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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