CN109714864A - Leakage current control circuit, method and LED drive system - Google Patents
Leakage current control circuit, method and LED drive system Download PDFInfo
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- CN109714864A CN109714864A CN201910127578.6A CN201910127578A CN109714864A CN 109714864 A CN109714864 A CN 109714864A CN 201910127578 A CN201910127578 A CN 201910127578A CN 109714864 A CN109714864 A CN 109714864A
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Abstract
This application discloses a kind of leakage current control circuits, applied in the LED drive system with power tube of releasing, it is characterized in that, the leakage current control circuit includes: sample circuit, sampling characterization flows through the first sampled signal of electric current in the LED drive system main power tube；Sampling characterizes the second sampled signal of the LED drive system line voltage；Control signal generating circuit, control signal is generated according to first and second described sampled signal, and the on and off for power tube of releasing according to the different control signal controls, while to guarantee that Triac light modulator operates normally, resulting power consumption is effectively reduced, solves problem of the prior art.
Description
Technical field
This application involves the vent discharge flow controls in leakage current control technology field more particularly to a kind of LED light adjusting system
Circuit processed.
Background technique
Currently, LED as forth generation light source, has the characteristics that environmental protection, the service life is long, light efficiency is high, by as lighting source
It is widely applied to every field.
Traditional household bidirectional triode thyristor (Triac) light modulator is suitble to adjust incandescent lamp and this kind of resistive of halogen lamp is negative
It carries, flashing can be led to the problem of when it is to the Switching Power Supplies load light modulation such as common LED driving, be less able to achieve wide scope
Brightness adjustment control.
In general, Triac light modulator can only be in 1,3 quadrant jobs, and it is worked normally, need a latch-up current
IL and holding electric current (holding current) IH, when trigger current mainly has trigger signal, Triac light modulator can be touched
The minimum current of hair.When maintenance electric current after Triac dimmer, the minimum current of its normal work is maintained.Once Triac
Light modulator maintains electric current inadequate when triggering moment not having enough trigger currents either to work normally, and can all cause Triac
The triggering again of light modulator.
It is contemplated that the characteristics of arriving Triac light modulator, if thinking, original light modulator is not changed, and is directly replaced with LED and is matched
There are the incandescent lamp and halogen lamp of Triac light modulator, this is the bottleneck problem for realizing green energy conservation illumination.
It can be solved the above problems at present using leadage circuit, still, the addition of leadage circuit brings power consumption again and asks
Topic.
It is that those skilled in the art institute is urgently to be resolved so how to reduce the power consumption generated since leadage circuit is added
The technical issues of.
Summary of the invention
In view of this, the application is designed to provide a kind of leakage current control circuit and the LED driving system using it
System, to guarantee the normal use of Triac light modulator in LED drive system, and the function that will be generated since leadage circuit is added
Consumption is preferably minimized.
To achieve the above object, the application provides the following technical solutions:
A kind of leakage current control circuit, applied in the LED drive system with power tube of releasing, which is characterized in that
The leakage current control circuit includes:
Sample circuit, sampling characterization flow through the first sampled signal of electric current in the LED drive system main power tube；Sampling
Characterize the second sampled signal of the LED drive system line voltage；
Signal generating circuit is controlled, control signal is generated according to first and second described sampled signal, and according to the control
It releases described in signal control processed the on and off of power tube, so that the power tube of releasing can after main power tube cut-off
It is connected again after delay a period of time.
Preferably, the control signal generating circuit carries out first and second described sample circuit from different reference voltages
Compare, the control signal of generation, so that:
The power tube of releasing has in the LED drive system before main power tube conducting required for Triac light modulator
Latch-up current；
Holding electric current needed for the power tube of releasing at least has the Triac light modulator when being connected；And
The power tube of releasing is connected after capable of postponing a period of time again after main power tube cut-off.
Preferably, the control signal includes:
The first kind for power tube on and off of releasing described in control controls signal；And
The second class control signal of the power tube current size of releasing is flowed through in control.
In one embodiment, the control signal generating circuit further includes current selecting circuit, including at least all the way can
The current branch coupled by control switch with the power tube of releasing flows through the big of power tube current of releasing with control
It is small.
In one embodiment, the leakage current control circuit further includes comparison circuit, for will it is described first and second
Sampled signal is compared from different reference voltages, generates multiple control signals.
Preferably, the current selecting circuit, including a plurality of current branch and can pass through second class control signal
The control switch of the control switch of control, each branch can be by the current source coupling of power tube of releasing size of current different from providing
It closes.
The application also provides a kind of LED drive system using above-mentioned technical proposal, which includes as described above
Leakage current control circuit.
The present invention also provides a kind of leakage current control method, applied in the LED drive system with power tube of releasing,
This method comprises:
Sampling characterization flows through the first sampled signal of electric current in the LED drive system main power tube；
Sampling characterizes the second sampled signal of the LED drive system line voltage；
Control signal is generated according to first and second described sampled signal, and is released according to control signal control
The on and off of power tube, so that the power tube of releasing is led again after capable of postponing a period of time after main power tube cut-off
It is logical.
Preferably, further include provide different electric currents for the power tube of releasing so that it is described release power tube conducting when,
The electric current flowed through in the power tube of releasing can guarantee:
The power tube of releasing has in the LED drive system required for Triac light modulator before main power tube conducting
Latch-up current；
Holding electric current needed for the power tube of releasing at least has the Triac light modulator when being connected；And
After main power tube cut-off, the power tube of releasing is connected again after capable of postponing a period of time.
It can be seen from the above technical scheme that the application by line voltage and flow through main power tube electric current carry out signal
Sampling, the two signals sampled is compared from different reference voltages, the control signal of generation makes: described to let out
Put power tube has latch-up current required for Triac light modulator in the LED drive system before main power tube conducting；It is described
Holding electric current needed for power tube of releasing at least has the Triac light modulator when being connected；And the power tube of releasing is in master
It after power tube cut-off, is connected after a period of time capable of being postponed, while guaranteeing that Triac light modulator operates normally, is effectively reduced again
Resulting power consumption, solves problem of the prior art.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of application for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is leakage current control circuit basic framework figure of the invention；
Fig. 2 is the specific embodiment schematic diagram of leakage current control circuit and LED drive system of the invention；
Fig. 3 cuts after being and before cuts Triac dimmer output waveform figure；
Fig. 4 be cut for light modulator in the past illustrate the corresponding Bleeder of Fig. 2 embodiment (release) power tube current and
The waveform diagram of reaction load Current Voltage；
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
The embodiment of the present application discloses a kind of leakage current control circuit and the LED drive system using it, to guarantee
The normal use of Triac light modulator in LED drive system, and will be dropped to most due to the power consumption that leadage circuit is added and generates
It is low.
The embodiment of the present application one provides a kind of leakage current control circuit, is applied in a kind of LED drive system, passes through
First and second described sampled signal is compared from different reference voltages, the control signal of generation makes: described to let out
Put power tube has latch-up current required for Triac light modulator in the LED drive system before main power tube conducting；It is described
Holding electric current needed for power tube of releasing at least has the Triac light modulator when being connected；And the power tube of releasing is in master
After power tube cut-off, be connected again after a period of time capable of being postponed.
Referring to Fig. 1, being leakage current control circuit basic framework figure of the invention.As shown, of the invention releases
Current control circuit, be applied to release power tube M2 LED drive system in, including sample circuit (it should be noted that
It is, since different sample mode and sampling site can be used, so only with Vbus modules exhibit in figure, but the present invention is not with this
It is limited), sampling characterization flows through the first sampled signal Visen of electric current in the LED drive system main power tube, in addition, also adopting
Sample characterizes the second sampled signal Vbus of the LED drive system line voltage；Signal generating circuit 24 is controlled, according to described first
And second sampled signal generate control signal, and the conductings for power tube of releasing according to the different control signals controls and cut
Only, and the size of the power tube current of releasing is flowed through.The composition of the part LED drive system is shown only in figure, under
Face can be described in detail in conjunction with specific embodiments.
Referring to Fig. 2, Fig. 2 is the specific embodiment signal of leakage current control circuit and LED drive system of the invention
Figure.Above-mentioned LED drive system is simply introduced first.As shown in Fig. 2, the LED drive system is at least in the present embodiment
Include:
Input ac power Vac, rectifier bridge 1, and the Triac light modulator 2 being coupled between power supply Vac and rectifier bridge 1,
The main power tube M1 of control load LED, and the power tube M2 that releases.
Under normal circumstances, under the action of Triac light modulator 2, line voltage generates the half-wave wave mode with corner cut, and passes through R1
It is divided with R2 and generates Vbus, referring to Fig. 3, the figure shows the basic waveforms that Triac light modulator generates.Triac light modulator is substantially
It is divided into two kinds, respectively before cuts light modulator and cut light modulator with after, waveform is as shown in the figure.
Fig. 4 be for cutting light modulator in the past illustrate the corresponding Bleeder of Fig. 2 embodiment (release) power tube current and
The waveform diagram of reaction load Current Voltage.Just two figures is combined to be described in detail below, in the present embodiment, leakage current control electricity
Road 3 includes sample circuit, it should be noted that as shown in figure 3, line voltage sampling is by R1 and R2 points in the present embodiment
What pressure was realized, sampling obtains Vbus, and can also have other approach in other embodiments, and the present invention is not limited thereto；Together
Sample, the electric current flowed through in main power tube is sampled by R3, and the electric current that R3 is flowed through in is in main power tube M1
The electric current flowed through.
Leakage current control circuit of the invention further includes control signal generating circuit, as shown in figure 3, being in the present embodiment
By being compared to the first sampled signal Visen and the second sampled signal Vbus from different reference voltages, then pass through logic
Circuit 32 generates multiple control signal.Wherein, the first kind controls the SWA signal in signal such as figure, is used to control power of releasing
The conducting and cut-off of pipe；Another kind of control signal is control such as the control switch in Fig. 3 in three branches: being signal respectively
SWB,SWC,SWD；And three branches have can control current source I1, I2 that size of current is flowed through when releasing power tube conducting,
I3.And a kind of embodiment for realizing the present invention program is only presented in the present embodiment.
Next, cooperation Fig. 4, to illustrate that the present invention also provides a kind of circuits and method for controlling leakage current.Work as detection
It is greater than reference voltage Vbusref1 to line voltage Vbus, it is judged that preceding open control switch SWA, SWB earnestly along arriving,
It is I1 that setting, which then flows through Bleeder power tube current, and a set time T1 is connected in SWB, and the electric current of I1 setting is larger, I1 setting
The size of electric current and the time T1 of conducting, the requirement (latch-up current) that satisfaction of being subject to can maintain light modulator to work normally.
After the T1 time, SWB shutdown, SWA maintains conducting, and SWC is opened, at this point, it is I2, I2 mono- that Bleeder power tube current is flowed through in setting
Straight conducting is greater than VLED until Vbus, after main power tube has electric current to flow through, when main power tube electric current is greater than preset value Visen/R3
When, SWC and SWA is turned off.It crosses peak value with Vbus voltage to gradually decrease to be less than VLED, main power tube turns off, but at this time
And it is not turned on Bleeder power tube, when Vbus voltage is lower than Vbusref3, SWA, SWD are opened, and be arranged and then flow through
The electric current of Bleeder power tube is I3, and the size of I3 value is chosen for cutting the holding electric current of light modulator normal work before maintaining
(keeping electric current)；When Vbus voltage is less than Vbusref2, SWD is turned off, SWB is opened, then flows through Bleeder power tube
Electric current is I2, and the residual voltage for the part that the selection of I2 size as far as possible cuts away BUS voltage modulated light device is drawn to as low as possible.With
Just the correct detection for cutting edge of next cycle light modulator.It should be noted that in the present embodiment Vbusref1 selection with
The identical reference voltage of Vbusref2, in other embodiments can be different.
The method of Discrete control Bleeder power tube is open-loop control method, circuit realize it is simple, without the concern for closing
Ring control stability problem, for the demand of light modulator, each stage gives Bleeder power tube different size of electric current, and
It is not unified electric current, reduces the power consumption of Bleeder power tube.When Bus voltage, which crosses peak value, to be reduced, reduced in Vbus=Vo
To between Vbusref3* (R1+R2)/R2, it is not turned on Bleeder power tube, the power consumption of Bleeder pipe is further reduced, mentions
The high efficiency of light adjusting system.
The application also provides a kind of LED drive system using above-mentioned technical proposal, which includes as described above
Leakage current control circuit.
The application also provides a kind of leakage current control method, applied to have release power tube LED drive system in,
This method comprises:
Sampling characterization flows through the first sampled signal of electric current in the LED drive system main power tube；
Sampling characterizes the second sampled signal of the LED drive system line voltage；
Control signal is generated according to first and second described sampled signal, and is released according to control signal control
The on and off of power tube, so that the power tube of releasing is led again after capable of postponing a period of time after main power tube cut-off
It is logical.
It in a particular embodiment, further include providing different electric currents for the power tube of releasing, so that in the power of releasing
When pipe is connected, the electric current flowed through in the power tube of releasing can guarantee:
The power tube of releasing has in the LED drive system required for Triac light modulator before main power tube conducting
Latch-up current；
Holding electric current needed for the power tube of releasing at least has the Triac light modulator when being connected；And
After main power tube cut-off, the power tube of releasing is connected again after capable of postponing a period of time.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in a computer-readable storage medium
In, described program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be
Magnetic disk, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
The foregoing description of the disclosed embodiments makes professional and technical personnel in the field can be realized or use the application.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the application.Therefore, the application
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (9)
1. a kind of leakage current control circuit, applied in the LED drive system with power tube of releasing, which is characterized in that institute
Stating leakage current control circuit includes:
Sample circuit, sampling characterization flow through the first sampled signal of electric current in the LED drive system main power tube；Sampling characterization
Second sampled signal of the LED drive system line voltage；
Signal generating circuit is controlled, control signal is generated according to first and second described sampled signal, and believe according to the control
It releases described in number control the on and off of power tube, so that the power tube of releasing can postpone after main power tube cut-off
It is connected again after a period of time.
2. leakage current control circuit according to claim 1, which is characterized in that the control signal generating circuit is by institute
It states first and second sampled signal to be compared from different reference voltages, the control signal of generation, so that:
The power tube of releasing has door bolt required for Triac light modulator in the LED drive system before main power tube conducting
Lock electric current；
Holding electric current needed for the power tube of releasing at least has the Triac light modulator when being connected；And
After main power tube cut-off, the power tube of releasing is connected again after capable of postponing a period of time.
3. leakage current control circuit according to claim 2, which is characterized in that further include comparison circuit, be used for institute
It states first and second sampled signal to be compared from different reference voltages, generates multiple control signals.
4. leakage current control circuit according to claim 1, which is characterized in that the control signal includes:
The first kind for power tube on and off of releasing described in control controls signal；And
The second class control signal of the power tube current size of releasing is flowed through in control.
5. leakage current control circuit according to claim 1 or 4, which is characterized in that the control signal generating circuit
It further include current selecting circuit, including the electric current branch that can be at least coupled all the way by control switch with the power tube of releasing
Road, to control the size for flowing through the power tube current of releasing.
6. leakage current control circuit according to claim 5, which is characterized in that the current selecting circuit, including it is more
Current branch and the control switch that signal control can be controlled by second class, the control switch of each branch can will
The current source of power tube of releasing size of current different from offer couples.
7. a kind of LED drive system, which is characterized in that including the leakage current control circuit as described in claim 1-6.
8. a kind of leakage current control method, applied in the LED drive system with power tube of releasing, which is characterized in that should
Method includes:
Sampling characterization flows through the first sampled signal of electric current in the LED drive system main power tube；
Sampling characterizes the second sampled signal of the LED drive system line voltage；
Control signal is generated according to first and second described sampled signal, and power of releasing according to control signal control
The on and off of pipe, so that the power tube of releasing is connected again after capable of postponing a period of time after main power tube cut-off.
9. according to the method described in claim 8, it is characterized in that, further include providing different electric currents for the power tube of releasing,
So that the electric current flowed through in the power tube of releasing can guarantee when the power tube of releasing is connected:
The power tube of releasing has door bolt required for Triac light modulator in the LED drive system before main power tube conducting
Lock electric current；
Holding electric current needed for the power tube of releasing at least has the Triac light modulator when being connected；And
After main power tube cut-off, the power tube of releasing is connected again after capable of postponing a period of time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910127578.6A CN109714864B (en) | 2019-02-20 | 2019-02-20 | Bleeder current control circuit and method and LED driving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910127578.6A CN109714864B (en) | 2019-02-20 | 2019-02-20 | Bleeder current control circuit and method and LED driving system |
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| CN109714864A true CN109714864A (en) | 2019-05-03 |
| CN109714864B CN109714864B (en) | 2024-10-25 |
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| CN114980423A (en) * | 2022-05-11 | 2022-08-30 | 福建晶旭半导体科技有限公司 | LED light engine circuit and lighting device |
| CN117477910A (en) * | 2023-12-26 | 2024-01-30 | 钰泰半导体股份有限公司 | Load current detection circuit of power tube |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109714864B (en) | 2024-10-25 |
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