CN106714392A - Sectional switching lighting adjustment control drive circuit with LED open circuit protection - Google Patents
Sectional switching lighting adjustment control drive circuit with LED open circuit protection Download PDFInfo
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- CN106714392A CN106714392A CN201710150723.3A CN201710150723A CN106714392A CN 106714392 A CN106714392 A CN 106714392A CN 201710150723 A CN201710150723 A CN 201710150723A CN 106714392 A CN106714392 A CN 106714392A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- 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]
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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]
Abstract
The invention discloses a sectional switching lighting adjustment control drive circuit with LED open circuit protection. The sectional switching lighting adjustment control drive circuit comprises an LED lighting circuit and an LED lighting adjustment circuit, wherein the lighting adjustment circuit comprises a sectional module, a system control module, a peak value detection module and a demagnetization time detection module; the peak value detection module is used for providing three types of output current reference voltage to set peak value current of an LED lamp tube; a plurality groups of switches are arranged inside the system control module and are used for selecting output current reference voltage of a corresponding section; the demagnetization time detection module is used for setting the demagnetization time of an inductor to implement open circuit over-voltage protection through the LED lamp tube; the demagnetization time and the output current reference voltage are arranged in a ratio, and thus the open circuit voltage of the LED lamp tube is kept unchanged.
Description
Technical field
The present invention relates to field of LED drive technology, and in particular to LED sectional dimming drive circuits.
Background technology
With the development and the requirement of energy-saving and environment friendly of LED drive power, current LED drive power generally has to be adjusted
Light function.In various dimming modes, switch-segment light modulation is a kind of.The switch of LED drive power point
Section light adjusting circuit, using the open and close repeatedly of regular tap come switch light modulation state, so as to obtain under different dimming states
LED output currents, to realize the purpose of sectional dimming.
It is mostly using switch-segment brightness adjustment control electricity in the LED output current size control aspects of switch-segment light modulation
Open and close of the road to detect regular tap are acted, and one group of control signal of corresponding different dimming state are produced, according to this
A little control signals choose different LED output current reference voltages, so as to obtain different size of LED output currents.
Existing LED drive circuit employs the setting demagnetization time to realize LED open-circuit-protections mostly.When system switching
To second segment, the benchmark of peakvalue's checking is changed into half, and LED current can be changed into half, so the demagnetization time of system can also be reduced to
The half of first paragraph, if now the minimum demagnetization time is constant, can cause LED open-circuit-protection voltages to diminish, and cause LED to be dodged
The content of the invention
The technical problem to be solved in the present invention is to solve above-mentioned the deficiencies in the prior art, solves existing LED drive circuit
It is in open-circuit-protection, the technical problem of LED lamp tube flicker.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：Block switch with LED open-circuit-protections is adjusted
Photocontrol drive circuit, including LED illumination circuit and LED light adjusting circuits, the lighting circuit include LED lamp tube, resistance, electricity
Hold and inductance, the light adjusting circuit includes segmentation module, system control module, peak detection block and demagnetization time detecting
Module, peak detection block provides three kinds of output current reference voltages to set the peak point current of the LED lamp tube of different sections, is
Some groups of switches are provided with inside system control module, and it is right to switch selection accordingly according to the output section signal behavior of segmentation module
The output current reference voltage of section is answered, the demagnetization time that the demagnetization time detecting module is used to set inductance comes to LED
Pipe carries out open circuit overvoltage protection, and it includes the capacitance group for setting the demagnetization time, and capacitance group sets three by system control module
Capacitance output is planted, its ratio is identical with the output current reference voltage ratio of peak detection block, and capacitance group is entered by DC source
Row is charged, and the demagnetization time of inductance is proportional with the charging interval of capacitance group corresponding, and during same section, system control module is opened
Corresponding switch selects the output current reference voltage of corresponding capacitance and peak detection block.
Further, the segmentation module by bus detection of power loss unit, UVLO modules, gate time detection unit and
Segmentation select unit；The UVLO modules are used to set the voltage up and down of LED illumination circuit opening and closing, prevent from opening repeatedly
Close；The bus detection of power loss unit connects the power down of UVLO modules and bus to busbar voltage and detects, the bus
Gate time detection unit resetted when detection of power loss unit reaches the upper voltage of UVLO modules and sends a control signal to segmentation
Select unit, starts during voltage under UVLO modules and gate time detection unit and starts timing, female when timing time reaches t1
Line detection of power loss unit and gate time detection unit send a signal to segmentation select unit carry out section switching, when power was lost between
Continue during to t2, segment selection module is reset to first paragraph；After LED tube open circuit, busbar voltage starts vibration, and cycle of oscillation is
T3, t2>t1>t3.
Further, also including block bit quantity selecting module, the module is connected with segmentation module, the selection of block bit quantity
Module includes SEL pin；When SEL pin are grounded, total section is two sections；When SEL pin are hanging, total section is three sections.
Further, the capacitance group of the demagnetization time detecting module includes three groups of electric capacity in parallel, respectively electric capacity CA,
Electric capacity CB, electric capacity CC, wherein (CA+CB+CC), (CB+CA), the output current reference voltage of the ratio of CA and peak detection block
Ratio it is identical.
Further, the ratio of the peak detection block input voltage is 8:4:3, the first paragraph of difference correspondence system
Position, the second section and the 3rd section；When lighting circuit is located at the first section and the second section, make in BCM patterns；Lighting circuit
When being operated in the second section, DCM patterns are operated in, the ON time of LED lamp tube and the ratio of shut-in time are 1:5.
Further, the bus detection of power loss unit is defeated exports high level in the upper voltage of UVLO modules, in UVLO
During the lower voltage of module, low level is exported, flip-flop number time detecting unit starts timing, and gate time detection unit is in timing
When reaching t1, high level is exported, when timing is less than t1, keep low level, bus detection of power loss unit and gate time detection are single
Unit level signal as rest-set flip-flop two inputs, rest-set flip-flop output end connection segment select unit triggering section
Switching
From above-mentioned technical proposal it can be seen that the present invention has advantages below：System peripherals are simple, and external SEL pins connect
Ground, is capable of achieving three sections of functions, is then vacantly two sections of functions；Segmentation can be realized but being changed from high-power to low power, energy-saving ring
Protect；The LED open-circuit-protections that system is carried, in the case of each segmentation, can be effectively protected LED.
Brief description of the drawings
Fig. 1 is functional block diagram of the invention；
Fig. 2 is the functional block diagram of segmentation module of the invention；
Fig. 3 is the schematic diagram of peak detection block of the invention；
Fig. 4 is the voltage oscillogram of Fig. 3；
Fig. 5 is the schematic diagram of demagnetization time detecting module of the invention；
Fig. 6 is of the invention under the non-open circuit situations of LED, vdd voltage, trigger signal VDET, trigger signal TD and RS
The structural representation of the output signal A of trigger；
Fig. 7 is of the invention when LED opens a way, vdd voltage, trigger signal VDET, trigger signal TD and rest-set flip-flop
Output signal A structural representation.
Specific embodiment
Specific embodiment of the invention is elaborated below in conjunction with accompanying drawing.
As shown in figure 1, the block switch brightness adjustment control drive circuit with LED open-circuit-protections of the invention, including LED illumination
Circuit and LED light adjusting circuits, lighting circuit include LED lamp tube, resistance, electric capacity and inductance, and LED lamp tube two ends are in parallel one
Electric capacity, resistance and inductance, are provided with Schottky tube between inductance and LED.Inductance passes through Schottky tube and LED tube discharge,
This discharge time is the demagnetization time.
Light adjusting circuit includes segmentation module, system control module, peak detection block, demagnetization time detecting module, block
Bit quantity selecting module, LED open-circuit-protections module and high power metal-oxide-semiconductor.
Bus is also connected with a 5V voltage generating module, is powered for the low-voltage module to internal system, equivalent to one
Linear voltage regulator.
Block bit quantity selecting module is connected with segmentation module, and block bit quantity selecting module includes SEL pin, and SEL pin connect
During ground, total section is three sections of ends, and when SEL pin are hanging, total section is three sections.
Segmentation module is by bus detection of power loss unit, UVLO modules, gate time detection unit and is segmented select unit,
UVLO modules connect bus and bus detection of power loss unit, and UVLO modules carry out under-voltage protection to circuit, and busbar voltage rises to
During the upper voltage, i.e. UVLO_ON voltages of UVLO modules, lighting circuit is started working；When busbar voltage is dropped under UVLO modules
During voltage, i.e., UVLO_OFF voltages when, then lighting circuit close.
The port that bus accesses light adjusting circuit is vdd terminal mouthful, therefore bus detection of power loss unit is also referred to as VDD detection of power loss
Unit, the module is used to detect the voltage change of vdd terminal mouthful, and trigger signal VDET to segmentation selection mould is sent according to voltage change
Block and gate time detection unit, when VDD detection of power loss units detect the upper voltage of UVLO modules, export high level；Detection
To UVLO modules lower voltage when, export low level, trigger signal VDET follows the vdd voltage to carry out saltus step.
As described in Figure 2, when gate time detection unit (gate time detection can be an oscillator counter) is to power down
Between carry out timing, output trigger signal T1 and T2 switches to select unit, trigger signal T1 is sorted for section, trigger signal T2
Segmentation select unit is reset to first paragraph.Gate time detection unit is when busbar voltage drops to the lower voltage of UVLO modules
Start timing, when timing time reaches t1, t1 by taking 200ms as an example, i.e. hold by the low level of trigger signal VDET in the present embodiment
The continuous time reaches 200ms, gate time detection unit outputs level signals TD, now TD be high level, level signal TD and touch
Signalling VDET connects a rest-set flip-flop, rest-set flip-flop output trigger signal A, the output of rest-set flip-flop as two inputs
End connection segment select unit, now trigger signal A outputs low level, segmentation select unit switching section.
When timing time reaches t2, as a example by 5 seconds, trigger signal T2 is fed directly to be segmented select unit, segmentation t2
Select unit resets to section, is reset to first paragraph.If " counter time detection " is opened without timing to 5S, system again
Beginning re-powers, and gate time detection unit resets and closes, then when vdd voltage has reached voltage on UVLO, system starts work
Make, then LED begins operating in the second stage mode.The 3rd stage mode is also as second segment by that analogy.After three-step closure
First paragraph is then switched to next time, repeats to analogize with this.
Segmentation select unit can be one group of logic gates, or a control chip, and system control module can
To be one group of switch, section of the segmentation select unit according to residing for sends control instruction to system control module.
Peak detection block is shown in Fig. 3.First paragraph employs benchmark VRF, and system is operated in BCM patterns, then the circuit of LED
ILED=VRF/ (2*RS), second segment employs benchmark for 1/2VRF, and system work is also operated in BCM patterns, such words LED
Electric current ILED=VRF/ (4*RS), electric current is the 50% of first paragraph, and the 3rd section employs benchmark for 3/8VRF, and system is operated in
DCM patterns, now by the electric current for controlling the ratio of LED ON times and shut-in time to set LED, the present invention inside circuit
Inner setting ratio is 1：5, now LED current is ILED=1/2*3VRF/ (8*RS) * 1/6, and the 3rd section of LED current is
The 6.25% of first paragraph.Each section of voltage oscillogram is shown in Fig. 4.The first section of correspondence of switch 1, the second section of correspondence of switch 2, switch 3
The 3rd section of correspondence, when section is selected, system control module opens corresponding switch.
The setting demagnetization time is all employed due to most non-isolated LED drive circuit to realize LED open-circuit-protections.
First according to the LED current of first paragraph, RS resistance is then determined according to LED current, 50K is typically then set according to frequency, really
Determine the size of inductance, the minimum demagnetization time is set finally according to the voltage of LED, the minimum demagnetization time is by regulation resistance
RADJ is determined.It is that the benchmark of peakvalue's checking is changed into half when system is switched to second segment, LED current can be changed into half, institute
The half of first paragraph can be also reduced to the demagnetization time of system, if now the minimum demagnetization time is constant, LED can be caused to open a way
Protection voltage diminishes, and causes LED to be dodged, thus now the minimum demagnetization time see the half for being changed into original.Equally at the 3rd section,
Because peakvalue's checking voltage is changed into the 3/8 of first paragraph, so the minimum demagnetization time will also be changed into original 3/8.
LED overvoltage protection structures in the present invention are as follows：As shown in figure 5, demagnetization time detecting module includes a constant current
Source and three groups of electric capacity in parallel, respectively electric capacity CA, electric capacity CB, electric capacity CC, electric capacity CA+CB+CC=CT, CA=3/8CT, CB=
1/8CT, CC=4/8CT, when A is then switched in first paragraph, B, C closes, and now the charging interval of electric capacity is T, when in the
Two sections then switch A and B and close, and switch C disconnects, and now capacitor charging time is 1/2T, are closed when A is then switched in the 3rd section,
Switch B and C disconnects, and now the charging interval of electric capacity is 3/8T.The charging interval of electric capacity can characterize the minimum demagnetization time, so
If, it is possible to LED open circuit protecting functions are realized, while ensureing to keep the protection voltage of LED consistent in obstructed section.
After LED opens a way, system has been put into LED open-circuit-protection patterns, and now the voltage of VCC can be in the upper voltage of UVLO
Do not stop to vibrate back and forth and lower voltage between, so can ceaselessly trigger the detection of block switch.System will ceaselessly jump section, when
LED is connected again again will be determined in for which section.The present invention improves this phenomenon, LED is connected again again after opening a way,
All the time it is in present segment.Circuit structure is shown in Fig. 4, and waveform is shown in Fig. 5, Fig. 6
Fig. 6 is that under normal circumstances (LED does not open a way), vdd voltage starts slowly to decline after system power failure, when dropping to
After UVLO_OFF voltages, detection of power loss module output trigger signal VDET, while the vibration calculator of inside is started working, when reaching
To 200ms, then explanation is that system is in normal powering down situation, then TD signals saltus step is high potential, makes a-signal that saltus step to occur,
Segment circuit in triggering segmentation module is switched to next stage mode.
Under Fig. 7 abnormal conditions (LED open circuits), after LED open circuits, system enters LED protected modes, now vdd voltage meeting
Vibrated between UVLO_ON and UVLO_OFF.Cycle is T3+T4, in general application system the time of T3+T4 30ms~
Between 60ms, in figure 6 it can be seen that VDET waveforms can follow the waveform of VDD ceaselessly in triggering, but it is now each
The rising edge of VDET can remove Triggered Oscillation counter resets, so power down is not above 200ms, VDET is just triggered, then TD
Low potential can be remained at.A-signal is set to keep high potential.Then system will not be switched to next stage mode.
To sum up the present invention has above advantage
1st, system peripherals are simple, external SEL pins ground connection, are capable of achieving three sections of functions, are then vacantly two sections of functions.
2nd, segmentation can be realized but being changed from high-power to low power, energy-conserving and environment-protective.
3rd, LED is segmented into 100%-50%-6.5%, or 100%-6.5%.Final stage can realize small night lamp function.
4th, the LED open-circuit-protections that system is carried, in the case of each segmentation, can be effectively protected LED.
Claims (6)
1. the block switch brightness adjustment control drive circuit with LED open-circuit-protections, including LED illumination circuit and LED light adjusting circuits,
The lighting circuit includes LED lamp tube, resistance, electric capacity and inductance, and the light adjusting circuit includes segmentation module, system control mould
Block, peak detection block and demagnetization time detecting module, peak detection block provide three kinds of output current reference voltages to set
The peak point current of the LED lamp tube of different sections is put, some groups of switches are provided with inside system control module, and according to segmentation module
Output section signal behavior switchs the output current reference voltage for choosing correspondence section accordingly, it is characterised in that：The demagnetization
Time detecting module carries out open circuit overvoltage protection for setting the demagnetization time of inductance to LED lamp tube, and it is included for setting
The capacitance group of demagnetization time, capacitance group sets three kinds of capacitances outputs, its ratio and peak detection block by system control module
Output current reference voltage ratio it is identical, capacitance group is charged by DC source, the demagnetization time of inductance and filling for capacitance group
Electric time proportional correspondence, during same section, system control module opens corresponding switch and selects corresponding capacitance and peak value
The output current reference voltage of detection module.
2. the block switch brightness adjustment control drive circuit with LED open-circuit-protections according to claim 1, it is characterised in that：
The segmentation module is by bus detection of power loss unit, UVLO modules, gate time detection unit and segmentation select unit；It is described
UVLO modules are used to set the voltage up and down of LED illumination circuit opening and closing, prevent open and close repeatedly；The bus power down
Detection unit connects the power down of UVLO modules and bus to busbar voltage and detects that the bus detection of power loss unit reaches
During the upper voltage of UVLO modules to gate time detection unit reset and send a control signal to segmentation select unit, in UVLO moulds
Start during voltage under block and gate time detection unit and start timing, when timing time reaches t1, bus detection of power loss unit and
Gate time detection unit send a signal to segmentation select unit carry out section switching, when power was lost between continue during to t2, be segmented
Selecting module is reset to first paragraph；After LED tube open circuit, busbar voltage starts vibration, and cycle of oscillation is t3, t2>t1>t3.
3. the block switch brightness adjustment control drive circuit with LED open-circuit-protections according to claim 2, it is characterised in that：
Also include block bit quantity selecting module, the module is connected with segmentation module, block bit quantity selecting module includes SEL pin；SEL
When pin is grounded, total section is two sections；When SEL pin are hanging, total section is three sections.
4. the block switch brightness adjustment control drive circuit with LED open-circuit-protections according to claim 1, it is characterised in that：
The capacitance group of the demagnetization time detecting module includes three groups of electric capacity in parallel, respectively electric capacity CA, electric capacity CB, electric capacity CC, its
In (CA+CB+CC), (CB+CA), the ratio of CA it is identical with the ratio of the output current reference voltage of peak detection block.
5. the block switch brightness adjustment control drive circuit with LED open-circuit-protections according to claim 4, it is characterised in that：
The ratio of the peak detection block input voltage is 8:4:3, the first section of correspondence system, the second section and the 3rd section respectively
Position；When lighting circuit is located at the first section and the second section, make in BCM patterns；When lighting circuit is operated in the second section, work
Make in DCM patterns, the ON time of LED lamp tube and the ratio of shut-in time are 1:5.
6. the block switch brightness adjustment control drive circuit with LED open-circuit-protections according to claim 2, it is characterised in that：
The bus detection of power loss unit is defeated to export high level in the upper voltage of UVLO modules, defeated in the lower voltage of UVLO modules
Go out low level, flip-flop number time detecting unit starts timing, gate time detection unit is when timing reaches t1, and output is high electric
It is flat, when timing is less than t1, keep low level, the level signal of bus detection of power loss unit and gate time detection unit is used as RS
Two inputs of trigger, the output end connection segment select unit triggering section switching of rest-set flip-flop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710150723.3A CN106714392B (en) | 2017-03-14 | 2017-03-14 | Block switch brightness adjustment control driving circuit with LED open-circuit-protections |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710150723.3A CN106714392B (en) | 2017-03-14 | 2017-03-14 | Block switch brightness adjustment control driving circuit with LED open-circuit-protections |
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| CN106714392A true CN106714392A (en) | 2017-05-24 |
| CN106714392B CN106714392B (en) | 2018-06-19 |
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| CN201710150723.3A Active CN106714392B (en) | 2017-03-14 | 2017-03-14 | Block switch brightness adjustment control driving circuit with LED open-circuit-protections |
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| CN107690213A (en) * | 2017-10-17 | 2018-02-13 | 无锡恒芯微科技有限公司 | Non-isolated low pressure does not flash LED drive circuit |
| TWI674037B (en) * | 2018-06-27 | 2019-10-01 | 大陸商北京集創北方科技股份有限公司 | LED driver circuit supporting low voltage input and its control chip |
| TWI720713B (en) * | 2019-08-27 | 2021-03-01 | 大陸商昂寶電子（上海）有限公司 | Quasi-resonant dimming control system and method |
| CN113853040A (en) * | 2020-06-28 | 2021-12-28 | 华润微集成电路(无锡)有限公司 | Sectional type output current control method and circuit for LED driving and LED driving system |
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| CN106714392B (en) | 2018-06-19 |
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