CN108366460A - Leadage circuit and LED drive circuit - Google Patents
Leadage circuit and LED drive circuit Download PDFInfo
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- CN108366460A CN108366460A CN201810319684.XA CN201810319684A CN108366460A CN 108366460 A CN108366460 A CN 108366460A CN 201810319684 A CN201810319684 A CN 201810319684A CN 108366460 A CN108366460 A CN 108366460A
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- busbar voltage
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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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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Abstract
The invention discloses a kind of leadage circuit and LED drive circuits, the waveform of busbar voltage is followed to change when controllable silicon dimmer is opened by controlling leakage current, so that the rate of decay of busbar voltage oscillation is accelerated, to while providing the firing current of controllable silicon dimmer unlatching moment, loss when controllable silicon dimmer is opened is reduced, the efficiency of LED drive circuit is improved.
Description
Technical field
The present invention relates to electron electric power technologies, more particularly, to a kind of leadage circuit and LED drive circuit.
Background technology
Controllable silicon dimmer is currently used light-dimming method, and controllable silicon dimmer is adjusted using phase control method to realize
Light obtains identical conduction phase angle that is, in every sine wave half cycle control controllable silicon dimmer conducting.It is silicon-controlled by adjusting
The chopped phase of light modulator, thus it is possible to vary the size of conduction phase angle realizes light modulation.
Controllable silicon dimmer triacs (Triode for Alternating Current,
TRIAC working characteristics) is：When its grid is triggered so that when element becomes conducting from turning off, element conductive is maintained to need one
Minimum current can be described as latch-up current (Latching Current or latching current).In triac
After element conductive, the minimum current that its conducting needs is maintained to be referred to as maintaining electric current (Holding Current).Usually,
Maintain electric current related with junction temperature, meanwhile, latch-up current is 2-4 times bigger than maintaining electric current.
Controllable silicon dimmer open when need bigger firing current, the inductance and capacitance in controllable silicon dimmer it
Between will produce resonance so that be supplied to LED drive circuit input voltage generate oscillation.In controllable silicon dimmer to LED
When load is dimmed, if input voltage vibrates, the input current of LED drive circuit can also be vibrated, is likely to result in defeated
Enter the case where electric current is less than the maintenance electric current of controllable silicon dimmer, so that controllable silicon dimmer shutdown or abnormal contact,
And then there is the problem of spike or abnormal shutdown in the driving current for LED load occur.
Controllable silicon dimmer shutdown or abnormal contact in order to prevent are used and are opened in controllable silicon dimmer in the prior art
The electric current of the similar square wave of input one when opening, what is generated when controllable silicon dimmer unlatching but this method does not simply fail to decay shakes
It swings, and firing current needs to maintain the long period, therefore circuit loss is larger, it is less efficient.
Invention content
In view of this, the present invention provides a kind of leadage circuit and LED drive circuit, to be opened in offer controllable silicon dimmer
While opening the firing current of moment, reduces loss when controllable silicon dimmer is opened, improve the efficiency of LED drive circuit.
In a first aspect, providing a kind of leadage circuit, it is applied to the LED drive circuit with controllable silicon dimmer, it is described to let out
Electric discharge road includes：
It releases module, is configured as connecting with the DC bus of LED drive circuit, and controlled bus current of releasing；And
Controller, the module that is configured as when the controllable silicon dimmer is opened releasing described in control make leakage current with
Change with the waveform of busbar voltage, to accelerate the rate of decay of the busbar voltage oscillation.
Further, the leakage current is not less than the controllable silicon dimmer in the busbar voltage attenuation process
Latching current, and be gradually reduced with the reduction of the oscillation amplitude of the busbar voltage.
Further, module of releasing described in the controller control generates the leakage current of predetermined time.
Further, the predetermined time is more than the die-away time of busbar voltage oscillation.
Further, the controller includes：
Antihunt circuit is configured as carrying out sampling generation reference signal to the waveform of the busbar voltage；
Current control circuit is configured as according to module of releasing described in the reference signal and current sampling signal output
Signal is controlled, the current sampling signal is for characterizing the leakage current.
Further, the antihunt circuit has scheduled time constant to adjust the reference signal.
Further, the controller further includes：
Bleeder circuit is configured as carrying out voltage of the partial pressure generation for characterizing the busbar voltage to the busbar voltage
Sampled signal；
The antihunt circuit is additionally configured to export the reference signal according to the waveform of the voltage sampling signal.
Further, the antihunt circuit includes：
Resistance；And
Capacitance, it is in series with a resistor to be connected between busbar and ground terminal；Or
The antihunt circuit includes：
Resistance；And
Capacitance, it is in series with a resistor to be connected between the output and ground of the bleeder circuit.
Further, the module of releasing includes：
Transistor is configured as when the controllable silicon dimmer is opened, and is given birth to according to the concussion waveform of the busbar voltage
At the leakage current；
And
Sampling element is configured as sampling the leakage current to generate current sampling signal.
Second aspect provides a kind of LED drive circuit, including：
Controllable silicon dimmer is connected to alternating current input power supplying；
Rectification circuit is connect with the controllable silicon dimmer, and busbar voltage is exported to DC bus；
LED circuit control module is configured as the electric current that LED load is flowed through in control；And
Leadage circuit as described above.
The technical solution of the embodiment of the present invention follows busbar electric by controlling leakage current when controllable silicon dimmer is opened
The waveform of pressure changes so that the rate of decay of busbar voltage oscillation is accelerated, to provide controllable silicon dimmer unlatching
While the firing current of moment, loss when controllable silicon dimmer is opened is reduced, the efficiency of LED drive circuit is improved.
Description of the drawings
By referring to the drawings to the description of the embodiment of the present invention, the above and other purposes of the present invention, feature and
Advantage will be apparent from, in the accompanying drawings：
Fig. 1 is the circuit diagram of the LED drive circuit of the embodiment of the present invention；
Fig. 2 is the circuit diagram of the LED drive circuit of first embodiment of the invention；
Fig. 3 is the circuit diagram of the LED drive circuit of second embodiment of the invention；
Fig. 4 is the working waveform figure of the LED drive circuit of the prior art；
Fig. 5 is the working waveform figure of the LED drive circuit of the embodiment of the present invention.
Specific implementation mode
Below based on embodiment, present invention is described, but the present invention is not restricted to these embodiments.Under
Text to the present invention datail description in, it is detailed to describe some specific detail sections.Do not have for a person skilled in the art
The description of these detail sections can also understand the present invention completely.In order to avoid obscuring the essence of the present invention, well known method, mistake
There is no narrations in detail for journey, flow, element and circuit.
In addition, it should be understood by one skilled in the art that provided herein attached drawing be provided to explanation purpose, and
What attached drawing was not necessarily drawn to scale.
It will also be appreciated that in the following description, " circuit " refer to passed through by least one element or sub-circuit it is electrical
The galvanic circle that connection or electromagnetism connect and compose.It " is connected when claiming element or another element of circuit " being connected to " or element/circuit
" between two nodes when, it can be directly coupled or connected another element or may exist intermediary element, element it
Between connection can be physically, in logic or its combination.On the contrary, when claiming element " being directly coupled to " or " directly connecting
Be connected to " another element when, it is meant that the two be not present intermediary element.
Unless the context clearly requires otherwise, "include", "comprise" otherwise throughout the specification and claims etc. are similar
Word should be construed as the meaning for including rather than exclusive or exhaustive meaning；That is, being containing for " including but not limited to "
Justice.
In the description of the present invention, it is to be understood that, term " first ", " second " etc. are used for description purposes only, without
It can be interpreted as indicating or implying relative importance.In addition, in the description of the present invention, unless otherwise indicated, the meaning of " multiple "
It is two or more.
Fig. 1 is the circuit diagram of the LED drive circuit of the embodiment of the present invention.As shown in Figure 1, LED drive circuit includes
Controllable silicon dimmer TRIAC, rectification circuit 11, leadage circuit 12 and LED circuit control module 13.Controllable silicon dimmer TRIAC
It is connected between ac input end mouth and rectification circuit 11.Rectification circuit 11 is connect with controllable silicon dimmer, can for that will pass through
Alternating current after control silicon light modulator TRIAC copped waves is converted to direct current and is output to DC bus BUS.LED circuit control module 13
It is configured as the electric current that LED load is flowed through in control.
Leadage circuit 12 is connect with DC bus BUS, is configured as controlling busbar of releasing when controllable silicon dimmer is opened
Electric current, and control leakage current and the waveform of busbar voltage is followed to change, to accelerate the rate of decay of busbar voltage oscillation.
Preferably, leadage circuit 12 be additionally configured to control leakage current be not less than in the busbar voltage attenuation process
The latching current of the controllable silicon dimmer, and be gradually reduced with the reduction of the oscillation amplitude of busbar voltage, to ensure
Reduce the loss of circuit under conditions of controllable silicon dimmer TRIAC conductings.
Preferably, leadage circuit 12 generates the leakage current of predetermined time when controllable silicon dimmer TRIAC is opened.Into one
Step ground, leadage circuit 12 release bus current predetermined time be more than busbar voltage oscillation die-away time.This is not only maintained
The conducting electric current of controllable silicon dimmer TRIAC also effectively prevents controllable silicon dimmer TRIAC and is touched in the abnormal of open stage
Hair (for example, when maintaining the conducting electric current of controllable silicon dimmer TRIAC inadequate, causes controllable silicon dimmer TRIAC to be constantly in
Rebooting status), it is ensured that the stability of circuit.
It should be understood that the leadage circuit in the present embodiment acts only on controllable silicon dimmer TRIAC open stages, with prevent can
Abnormal triggerings of the silicon light modulator TRIAC in open stage is controlled, the driving electricity of LED load is dropped to less than in busbar voltage VBUS
Other leadage circuits are also needed to when pressure to release.
In conclusion the present embodiment follows shaking for busbar voltage when controllable silicon dimmer is opened by controlling leakage current
Swing waveform variation so that the rate of decay of busbar voltage oscillation is accelerated, to provide controllable silicon dimmer unlatching moment
While firing current, loss when controllable silicon dimmer is opened is reduced, the efficiency of LED drive circuit is improved.
Fig. 2 is the circuit diagram of the LED drive circuit of first embodiment of the invention.As shown in Fig. 2, LED drive circuit
Including controllable silicon dimmer TRIAC, rectification circuit 21, leadage circuit 22 and LED circuit control module 23.Controllable silicon dimmer
TRIAC is connected between ac input end mouth and rectification circuit 21.Rectification circuit 21 is connect with controllable silicon dimmer, for will be through
The alternating current crossed after controllable silicon dimmer TRIAC copped waves is converted to direct current and is output to DC bus BUS.LED circuit controls mould
Block 23 is configured as the electric current that LED load is flowed through in control.
In the present embodiment, as shown in Fig. 2, leadage circuit 22 includes release module 221 and controller 222.It releases module
221 are configured as connecting with the DC bus of LED drive circuit, and release controllable silicon dimmer TRIAC open stages are controlled
Bus current.Controller 222 is configured as releasing module 221 so that letting out in the control of controllable silicon dimmer TRIAC open stages
Discharge stream Ibld follows the waveform of busbar voltage VBUS to change, to accelerate the decaying speed of the busbar voltage VBUS oscillations
Degree.
Wherein, module of releasing 221 includes transistor Q and sampling element R3.Transistor Q is configured as in controllable silicon dimmer
TRIAC open when it is controlled conducting with bus current of releasing, and after the predetermined time controlled shutdown to reduce circuit loss.Sampling member
Part R3 is configured as sampling leakage current Ibld to generate the current sampling signal Vbld for characterizing leakage current Ibld.Ying Li
Solution, the present embodiment sampling resistor is as sampling element, but other elements that can be carried out to leakage current can be applied to
In the present embodiment.
Controller 222 includes antihunt circuit a, bleeder circuit b and current control circuit cl.Bleeder circuit b is connected to LED drives
Between the DC bus and ground terminal of dynamic circuit, including resistance R1 and resistance R2.Bleeder circuit b is configured as to busbar voltage
VBUS carries out voltage sampling signal SVbus of the partial pressure generation for characterizing busbar voltage VBUS.Antihunt circuit a is connected to partial pressure electricity
Between the output and ground of road b, for generating reference signal Vref according to voltage sampling signal SVbus.In the present embodiment
In, antihunt circuit a is the RC first differential circuits being made of resistance R and capacitance C, for the oscillation wave according to busbar voltage VBUS
Shape generates reference signal Vref.It should be understood that other can realize that the circuit structure of above-mentioned effect can be applied to the present embodiment
In.Current control circuit cl is used to generate the control for module 221 of releasing according to reference signal Vref and current sampling signal Vbld
Signal VG.In a preferred embodiment, difference amplifier can be used in current control circuit.It should be understood that other can be real
The circuit structure of existing above-mentioned effect can be applied in the present embodiment.
When controllable silicon dimmer TRIAC is opened, will produce between the inductance and capacitance in controllable silicon dimmer TRIAC humorous
It shakes, this input voltage that controllable silicon dimmer can be caused to be supplied to LED drive circuit generates more high-frequency oscillation.Namely
It says, when controllable silicon dimmer TRIAC is opened, busbar voltage VBUS can be vibrated with relatively high frequency.
In the present embodiment, busbar voltage VBUS is divided by bleeder circuit b to generate characterization busbar voltage
The voltage sampling signal SVbus of VBUS.It is readily appreciated that, the frequency of oscillation of voltage sampling signal SVbus is with busbar voltage VBUS's
Frequency of oscillation keeps equal.And sampling is carried out to the waveform of voltage sampling signal SVbus by antihunt circuit a and generates benchmark
Signal Vref.Then module 221 of releasing is controlled by the variation of reference signal Vref to release to bus current.
When busbar voltage VBUS changes (voltage sampling signal SVbus corresponds to proportional variation), the electricity in antihunt circuit a
Hold C to be charged rapidly (or electric discharge), reference signal Vref is proportional to the time rate of change of busbar voltage VBUS.Also, according to
The reference signal Vref and current sampling signal Vbld control signal VG generated follow reference signal Vref to change.Therefore, it releases
The control signal VG of module 221 follows the waveform of busbar voltage VBUS to change, and in turn, leakage current Ibld follows busbar electric
The waveform variation of VBUS is pressed, this makes the oscillatory extinction speed of busbar voltage VBUS accelerate.Therefore, in the present embodiment
LED drive circuit can accelerate the rate of decay of busbar voltage oscillation in silicon-controlled unlatching.
Since reference signal Vref is proportional to the time rate of change of busbar voltage VBUS, when busbar voltage VBUS vibrates width
When the gradual decaying of value (namely the time rate of change of busbar voltage VBUS reduces), reference signal Vref is also gradually reduced therewith, from
And the control signal VG for module 221 of releasing is gradually reduced, leakage current Ibld is gradually reduced.Therefore, leakage current Ibld with
The reduction of the oscillation amplitude of busbar voltage VBUS and be gradually reduced.This makes LED circuit provide controllable silicon dimmer unlatching
While the firing current of moment, loss when controllable silicon dimmer is opened is reduced, the efficiency of LED drive circuit is improved.
It is readily appreciated that, when busbar voltage VBUS vibrates very little, the time rate of change of busbar voltage VBUS is approximately 0, leakage current
Ibld is also approximately at 0.
Preferably, leadage circuit 22 generates the leakage current of predetermined time when controllable silicon dimmer TRIAC is opened.Into one
Step ground, leadage circuit 22 release bus current predetermined time be more than busbar voltage oscillation die-away time.This is not only maintained
The conducting electric current of controllable silicon dimmer TRIAC also effectively prevents controllable silicon dimmer TRIAC and is touched in the abnormal of open stage
Hair, it is ensured that the stability of circuit.
Preferably, antihunt circuit a has scheduled time constant with the rate of decay (the RC single orders of control bus voltage VBUS
Timeconstantτ=R*C of differential).It is readily appreciated that, the time constant of antihunt circuit a is bigger, the rate of decay of reference signal Vref
It is faster.But when time constant is excessive, the amplitude of reference signal Vref decaying is excessive (namely reference signal Vref is smaller),
So that the oscillation amplitude of leakage current Ibld is larger (namely leakage current Ibld is smaller), LED drive circuit may be such that
Input current is less than the latching current of controllable silicon dimmer TRIAC conductings and then leads to the abnormal passes controllable silicon dimmer TRIAC
Disconnected problem.Therefore, the time constant that rational antihunt circuit is arranged is vital.
In conclusion the present embodiment follows shaking for busbar voltage when controllable silicon dimmer is opened by controlling leakage current
Swing waveform variation so that the rate of decay of busbar voltage oscillation is accelerated, to provide controllable silicon dimmer unlatching moment
While firing current, loss when controllable silicon dimmer is opened is reduced, the efficiency of LED drive circuit is improved.
Fig. 3 is the circuit diagram of the LED drive circuit of second embodiment of the invention.As shown in figure 3, LED drive circuit
Including controllable silicon dimmer TRIAC, rectification circuit 31, leadage circuit 32 and LED circuit control module 33.Controllable silicon dimmer
TRIAC is connected between ac input end mouth and rectification circuit 31.Rectification circuit 31 is connect with controllable silicon dimmer, for will be through
The alternating current crossed after controllable silicon dimmer TRIAC copped waves is converted to direct current and is output to DC bus BUS.LED circuit controls mould
Block 33 is configured as the electric current that LED load is flowed through in control.
In the present embodiment, as shown in figure 3, leadage circuit 32 includes release module 321 and controller 322.Wherein, it releases
Module 321 includes transistor Q ' and sampling element R4.Transistor Q ' is configured as controlled when controllable silicon dimmer TRIAC is opened
Conducting with bus current of releasing, and after the predetermined time controlled shutdown to reduce circuit loss.Sampling element R4 is configured as adopting
Sample leakage current Ibld ' is to generate the current sampling signal Vbld ' for characterizing leakage current Ibld '.It should be understood that the present embodiment
Sampling resistor is as sampling element, but other elements that can be carried out to leakage current can be applied in the present embodiment.
Controller 322 includes antihunt circuit c and current control circuit cl1.Antihunt circuit c be connected to DC bus BUS and
Between ground terminal, for generating reference signal Vref ' according to busbar voltage VBUS.In the present embodiment, antihunt circuit c is by electricity
The RC first differential circuits for hindering R ' and capacitance C ' compositions, for generating reference signal according to the waveform of busbar voltage VBUS
Vref’.It should be understood that other can realize that the circuit structure of above-mentioned effect can be applied in the present embodiment.Current control electricity
Road cl1 is used to generate the control signal VG ' for module 321 of releasing according to reference signal Vref ' and current sampling signal Vbld '.
When controllable silicon dimmer TRIAC is opened, resonance is will produce between the inductance and capacitance in controllable silicon dimmer TRIAC, this can lead
The input voltage that controllable silicon dimmer is supplied to LED drive circuit is caused to generate more high-frequency oscillation.That is, can
When controlling the TRIAC unlatchings of silicon light modulator, busbar voltage VBUS can be vibrated with relatively high frequency.
In the present embodiment, sampling is carried out to the waveform of busbar voltage VBUS by antihunt circuit c and generates benchmark letter
Number Vref '.Then module 321 of releasing is controlled by the variation of reference signal Vref ' to release to bus current.
When busbar voltage VBUS changes, the capacitance C ' in antihunt circuit c is charged rapidly (or electric discharge), reference signal
Vref ' is proportional to the time rate of change of busbar voltage VBUS.Also, according to reference signal Vref ' and current sampling signal
The control signal VG ' that Vbld ' is generated follows reference signal Vref ' to change.Therefore, the control signal VG ' of module of releasing 321 is followed
The waveform of busbar voltage VBUS changes, and in turn, leakage current Ibld ' follows the waveform of busbar voltage VBUS to change,
This makes the oscillatory extinction of busbar voltage VBUS accelerate.Therefore, the energy in silicon-controlled unlatching of the LED drive circuit in the present embodiment
Enough accelerate the rate of decay of busbar voltage oscillation.
Since reference signal Vref ' is proportional to the time rate of change of busbar voltage VBUS, when busbar voltage VBUS vibrates
Amplitude gradually decay the time rate of change of busbar voltage VBUS (namely reduce) when, reference signal Vref ' is also gradually reduced therewith,
It is gradually reduced to the control signal VG ' for module 321 of releasing, leakage current Ibld ' is gradually reduced.Therefore, leakage current Ibld '
It is gradually reduced with the reduction of the oscillation amplitude of busbar voltage VBUS.This makes LED circuit provide controllable silicon dimmer
While opening the firing current of moment, loss when controllable silicon dimmer is opened is reduced, the effect of LED drive circuit is improved
Rate.It is readily appreciated that, when busbar voltage VBUS vibrates very little, the time rate of change of busbar voltage VBUS is approximately 0, leakage current
Ibld ' is also approximately at 0.
Preferably, leadage circuit 32 generates the leakage current of predetermined time when controllable silicon dimmer TRIAC is opened.Into one
Step ground, leadage circuit 32 release bus current predetermined time be more than busbar voltage oscillation die-away time.This is not only maintained
The conducting electric current of controllable silicon dimmer TRIAC also effectively prevents controllable silicon dimmer TRIAC and is touched in the abnormal of open stage
Hair, it is ensured that the stability of circuit.
Preferably, antihunt circuit c has scheduled time constant with the rate of decay (the RC single orders of control bus voltage VBUS
Timeconstantτ=R*C of differential).It is readily appreciated that, the time constant of antihunt circuit c is bigger, the decaying speed of reference signal Vref '
Degree is faster.But when time constant is excessive, the amplitude of reference signal Vref ' decaying it is excessive (namely reference signal Vref ' compared with
It is small) so that the oscillation amplitude of leakage current Ibld ' is larger (namely leakage current Ibld ' is smaller), may be such that LED drives
The input current of circuit is less than the latching current of controllable silicon dimmer TRIAC conductings and then leads to controllable silicon dimmer TRIAC not
The problem of normal turn-off.Therefore, the time constant that rational antihunt circuit is arranged is vital.
In conclusion the present embodiment follows shaking for busbar voltage when controllable silicon dimmer is opened by controlling leakage current
Swing waveform variation so that the rate of decay of busbar voltage oscillation is accelerated, to provide controllable silicon dimmer unlatching moment
While firing current, loss when controllable silicon dimmer is opened is reduced, the efficiency of LED drive circuit is improved.
Fig. 4 is the working waveform figure of the LED drive circuit of the prior art.Fig. 5 is the LED drive circuit of the embodiment of the present invention
Working waveform figure.As shown in figure 4, traditional LED drive circuit is not provided with antihunt circuit.At the t1 ' moment, controllable silicon dimmer
It opens, module of releasing provides fixed leakage current Ibld1 (electric current of similar square wave) and releases the regular hour (t1 '-t2 ').
Open stage due to busbar voltage in controllable silicon dimmer generates oscillation, in order to avoid there is controllable silicon dimmer shutdown
Or the case where abnormal contact, the leakage current Ibld1 of module of releasing need a larger value and needing maintain one section compared with
The long time.Which results in LED drive circuits to have larger loss, reduces the efficiency of LED drive circuit.
And in the present embodiment, as shown in figure 5, the time rate of change of reference signal Vref and busbar voltage VBUS at than
Example so that leakage current Ibld follows the waveform of busbar voltage VBUS to change, and then accelerates busbar voltage VBUS oscillations
The rate of decay so that leakage current Ibld is gradually reduced with the reduction of the oscillation amplitude of busbar voltage VBUS.This
So that LED drive circuit reduces controllable silicon light modulation while providing the firing current of controllable silicon dimmer unlatching moment
Loss when device is opened, improves the efficiency of LED drive circuit.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for those skilled in the art
For, the present invention can have various modifications and changes.It is all within spirit and principles of the present invention made by any modification, equivalent
Replace, improve etc., it should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of leadage circuit, is applied to the LED drive circuit with controllable silicon dimmer, the leadage circuit includes：
It releases module, is configured as connecting with the DC bus of LED drive circuit, and controlled bus current of releasing；And
Controller, the module that is configured as when the controllable silicon dimmer is opened releasing described in control make leakage current follow mother
The waveform of line voltage changes, to accelerate the rate of decay of the busbar voltage oscillation.
2. leadage circuit according to claim 1, which is characterized in that the leakage current was decayed in the busbar voltage
It is not less than the latching current of the controllable silicon dimmer in journey, and gradual with the reduction of the oscillation amplitude of the busbar voltage
Reduce.
3. leadage circuit according to claim 1, which is characterized in that module of releasing described in the controller control generates pre-
The leakage current fixed time.
4. leadage circuit according to claim 3, which is characterized in that the predetermined time is vibrated more than the busbar voltage
Die-away time.
5. leadage circuit according to claim 1, which is characterized in that the controller includes：
Antihunt circuit is configured as sampling with output reference signal the waveform of the busbar voltage；
Current control circuit is configured as the control according to module of releasing described in the reference signal and current sampling signal generation
Signal, the current sampling signal is for characterizing the leakage current.
6. leadage circuit according to claim 5, which is characterized in that the antihunt circuit have scheduled time constant with
Adjust the reference signal.
7. leadage circuit according to claim 5, which is characterized in that the controller further includes：
Bleeder circuit is configured as carrying out voltage sample of the partial pressure generation for characterizing the busbar voltage to the busbar voltage
Signal；
The antihunt circuit is additionally configured to export the reference signal according to the waveform of the voltage sampling signal.
8. leadage circuit according to claim 5, which is characterized in that the antihunt circuit includes：
Resistance；And
Capacitance, it is in series with a resistor to be connected between busbar and ground terminal；Or
The antihunt circuit includes：
Resistance；And
Capacitance, it is in series with a resistor to be connected between the output and ground of the bleeder circuit.
9. leadage circuit according to claim 1, which is characterized in that the module of releasing includes：
Transistor is configured as when the controllable silicon dimmer is opened, and institute is generated according to the concussion waveform of the busbar voltage
State leakage current；
And
Sampling element is configured as sampling the leakage current to generate current sampling signal.
10. a kind of LED drive circuit, including：
Controllable silicon dimmer is connected to alternating current input power supplying；
Rectification circuit is connect with the controllable silicon dimmer, and busbar voltage is exported to DC bus；
LED circuit control module is configured as the electric current that LED load is flowed through in control；And
Such as claim 1-9 any one of them leadage circuits.
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| CN201810319684.XA CN108366460B (en) | 2018-04-11 | 2018-04-11 | Leadage circuit and LED drive circuit |
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| CN201810319684.XA CN108366460B (en) | 2018-04-11 | 2018-04-11 | Leadage circuit and LED drive circuit |
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| CN110493913A (en) * | 2019-08-06 | 2019-11-22 | 昂宝电子（上海）有限公司 | The control system and method for LED illumination System for controllable silicon light modulation |
| CN110831295A (en) * | 2019-11-20 | 2020-02-21 | 昂宝电子（上海）有限公司 | Dimming control method and system for dimmable LED lighting system |
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| US10999904B2 (en) | 2012-11-12 | 2021-05-04 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for dimming control using TRIAC dimmers |
| US10999903B2 (en) | 2017-11-30 | 2021-05-04 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for stage-based control related to TRIAC dimmers |
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| US11212885B2 (en) | 2014-04-25 | 2021-12-28 | Guangzhou On-Bright Electronics Co., Ltd. | Systems and methods for intelligent control related to TRIAC dimmers |
| US11224105B2 (en) | 2019-02-19 | 2022-01-11 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods with TRIAC dimmers for voltage conversion related to light emitting diodes |
| US11252799B2 (en) | 2019-12-27 | 2022-02-15 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for controlling currents flowing through light emitting diodes |
| US11540371B2 (en) | 2020-04-13 | 2022-12-27 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for controlling power factors of LED lighting systems |
| US11564299B2 (en) | 2019-12-19 | 2023-01-24 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for providing power supply to current controllers associated with LED lighting |
| US11570859B2 (en) | 2017-12-28 | 2023-01-31 | On-Bright Electronics (Shanghai) Co., Ltd. | LED lighting systems with TRIAC dimmers and methods thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103004290A (en) * | 2010-07-13 | 2013-03-27 | 皇家飞利浦电子股份有限公司 | Bleeding circuit and related method for preventing improper dimmer operation |
| CN103313466A (en) * | 2012-03-13 | 2013-09-18 | 艾沃特有限公司 | Power dissipation monitor for current sink function of power switching transistor |
| CN103687154A (en) * | 2012-09-20 | 2014-03-26 | 欧司朗股份有限公司 | Phase-cut dimming control circuit and lighting control device |
| CN103945619A (en) * | 2014-05-13 | 2014-07-23 | 矽力杰半导体技术(杭州)有限公司 | Light-dimmable LED drive circuit |
| CN104010422A (en) * | 2014-06-13 | 2014-08-27 | 成都芯源***有限公司 | LED driving device and controller and control method thereof |
| CN104735860A (en) * | 2013-12-24 | 2015-06-24 | 恩智浦有限公司 | Bleeder circuit controller |
| CN106332374A (en) * | 2016-10-26 | 2017-01-11 | 杰华特微电子（杭州）有限公司 | Bleeder circuit and method for controlling bleeder current and LED control circuit |
| US20170223794A1 (en) * | 2016-02-03 | 2017-08-03 | Ketra, Inc. | Illumination device and method for decoupling power delivered to an led load from a phase-cut dimming angle |
-
2018
- 2018-04-11 CN CN201810319684.XA patent/CN108366460B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103004290A (en) * | 2010-07-13 | 2013-03-27 | 皇家飞利浦电子股份有限公司 | Bleeding circuit and related method for preventing improper dimmer operation |
| CN103313466A (en) * | 2012-03-13 | 2013-09-18 | 艾沃特有限公司 | Power dissipation monitor for current sink function of power switching transistor |
| CN103687154A (en) * | 2012-09-20 | 2014-03-26 | 欧司朗股份有限公司 | Phase-cut dimming control circuit and lighting control device |
| CN104735860A (en) * | 2013-12-24 | 2015-06-24 | 恩智浦有限公司 | Bleeder circuit controller |
| CN103945619A (en) * | 2014-05-13 | 2014-07-23 | 矽力杰半导体技术(杭州)有限公司 | Light-dimmable LED drive circuit |
| CN104010422A (en) * | 2014-06-13 | 2014-08-27 | 成都芯源***有限公司 | LED driving device and controller and control method thereof |
| US20170223794A1 (en) * | 2016-02-03 | 2017-08-03 | Ketra, Inc. | Illumination device and method for decoupling power delivered to an led load from a phase-cut dimming angle |
| CN106332374A (en) * | 2016-10-26 | 2017-01-11 | 杰华特微电子（杭州）有限公司 | Bleeder circuit and method for controlling bleeder current and LED control circuit |
Cited By (31)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10999904B2 (en) | 2012-11-12 | 2021-05-04 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for dimming control using TRIAC dimmers |
| US11212885B2 (en) | 2014-04-25 | 2021-12-28 | Guangzhou On-Bright Electronics Co., Ltd. | Systems and methods for intelligent control related to TRIAC dimmers |
| US11201612B2 (en) | 2017-07-10 | 2021-12-14 | On-Bright Electronics (Shanghai) Co., Ltd. | Switch control systems for light emitting diodes and methods thereof |
| US12009825B2 (en) | 2017-07-10 | 2024-06-11 | On-Bright Electronics (Shanghai) Co., Ltd. | Switch control systems for light emitting diodes and methods thereof |
| US11695401B2 (en) | 2017-07-10 | 2023-07-04 | On-Bright Electronics (Shanghai) Co., Ltd. | Switch control systems for light emitting diodes and methods thereof |
| US11784638B2 (en) | 2017-07-10 | 2023-10-10 | On-Bright Electronics (Shanghai) Co., Ltd. | Switch control systems for light emitting diodes and methods thereof |
| US11206015B2 (en) | 2017-07-10 | 2021-12-21 | On-Bright Electronics (Shanghai) Co., Ltd. | Switch control systems for light emitting diodes and methods thereof |
| US11183996B2 (en) | 2017-07-10 | 2021-11-23 | On-Bright Electronics (Shanghai) Co., Ltd. | Switch control systems for light emitting diodes and methods thereof |
| US10973095B2 (en) | 2017-09-14 | 2021-04-06 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for bleeder control related to lighting emitting diodes |
| US11026304B2 (en) | 2017-11-30 | 2021-06-01 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for stage-based control related to TRIAC dimmers |
| US10999903B2 (en) | 2017-11-30 | 2021-05-04 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for stage-based control related to TRIAC dimmers |
| US11570859B2 (en) | 2017-12-28 | 2023-01-31 | On-Bright Electronics (Shanghai) Co., Ltd. | LED lighting systems with TRIAC dimmers and methods thereof |
| US11937350B2 (en) | 2017-12-28 | 2024-03-19 | On-Bright Electronics (Shanghai) Co., Ltd. | LED lighting systems with TRIAC dimmers and methods thereof |
| US11638335B2 (en) | 2017-12-28 | 2023-04-25 | On-Bright Electronics (Shanghai) Co., Ltd. | LED lighting systems with TRIAC dimmers and methods thereof |
| US11678417B2 (en) | 2019-02-19 | 2023-06-13 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods with TRIAC dimmers for voltage conversion related to light emitting diodes |
| US11224105B2 (en) | 2019-02-19 | 2022-01-11 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods with TRIAC dimmers for voltage conversion related to light emitting diodes |
| TWI706691B (en) * | 2019-08-06 | 2020-10-01 | 大陸商昂寶電子（上海）有限公司 | Control system and method of LED lighting system for thyristor dimming |
| US11297704B2 (en) | 2019-08-06 | 2022-04-05 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for bleeder control related to TRIAC dimmers associated with LED lighting |
| CN110493913A (en) * | 2019-08-06 | 2019-11-22 | 昂宝电子（上海）有限公司 | The control system and method for LED illumination System for controllable silicon light modulation |
| CN110493913B (en) * | 2019-08-06 | 2022-02-01 | 昂宝电子（上海）有限公司 | Control system and method for silicon controlled dimming LED lighting system |
| US11792901B2 (en) | 2019-08-06 | 2023-10-17 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for bleeder control related to TRIAC dimmers associated with LED lighting |
| US11405992B2 (en) | 2019-11-20 | 2022-08-02 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for dimming control related to TRIAC dimmers associated with LED lighting |
| CN110831295A (en) * | 2019-11-20 | 2020-02-21 | 昂宝电子（上海）有限公司 | Dimming control method and system for dimmable LED lighting system |
| CN110831295B (en) * | 2019-11-20 | 2022-02-25 | 昂宝电子（上海）有限公司 | Dimming control method and system for dimmable LED lighting system |
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| US11856670B2 (en) | 2019-12-19 | 2023-12-26 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for providing power supply to current controllers associated with LED lighting |
| US11564299B2 (en) | 2019-12-19 | 2023-01-24 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for providing power supply to current controllers associated with LED lighting |
| US11723128B2 (en) | 2019-12-27 | 2023-08-08 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for controlling currents flowing through light emitting diodes |
| US11252799B2 (en) | 2019-12-27 | 2022-02-15 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for controlling currents flowing through light emitting diodes |
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