CN106358337B - Leadage circuit and leakage current control method and LED control circuit - Google Patents
Leadage circuit and leakage current control method and LED control circuit Download PDFInfo
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- CN106358337B CN106358337B CN201610947259.6A CN201610947259A CN106358337B CN 106358337 B CN106358337 B CN 106358337B CN 201610947259 A CN201610947259 A CN 201610947259A CN 106358337 B CN106358337 B CN 106358337B
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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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- 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]
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Abstract
The invention discloses a kind of leadage circuit and leakage current control methods and LED control circuit, the program of the present invention can be applied to Linear Driving scheme, the threshold voltage is zero-crossing values, when input voltage zero passage, load current is zero at this time, therefore leakage current is generated so that input current is greater than the maintenance electric current of controllable silicon dimmer, for maintaining the conducting of controllable silicon dimmer, and is set as delay time the second time, reduce power consumption, the present invention reduces leakage current, improves system effectiveness and system reliability under the premise of guaranteeing dimming effect.
Description
Technical field
The present invention relates to power electronics fields, and in particular to a kind of leadage circuit and leakage current control method and
LED control circuit.
Background technique
LED light due to its environmental protection more more energy efficient than traditional fluorescent lamp and incandescent lamp, so LED light slowly replacing it is existing
Fluorescent lamp and incandescent lamp.In the incandescent lamp with controllable silicon dimmer, similarly wish to use LED light to replace, thus
LED needs compatible silicon controlled light modulator.But by LED light come replace incandescent lamp application in, due in controlled silicon conducting,
Its output end voltage has biggish voltage change ratio (dv/dt), causes to generate biggish surge current in input terminal.This surge
Current oscillation amplitude is big, and the duration is short, and silicon-controlled mistake is easily caused to turn off, and influences the steady operation of LED drive circuit, makes
LED light generates flashing；In addition, the input current of silicon-controlled device, which need to be greater than it, maintains electric current, electricity is maintained when input current is less than
When stream, silicon-controlled shutdown is easily caused, also results in the flashing of LED.In order to solve the above-mentioned technical problem, in the prior art
Using following scheme, but there are still certain technological deficiencies.
As shown in Figure 1, being a kind of passive scheme of releasing of prior art, released using RC as passive.Program structure
Simply, at low cost.But in power frequency period tail portion and the silicon-controlled electric current for maintaining conducting required cannot be provided.Due to capacitor
C00 is charged to vin in controlled silicon conducting or close to vin, is discharged later by resistance R00, since RC time constant is big, in half cycle
Middle part even tail portion electric discharge, reduce input current instead, be unfavorable for the silicon-controlled conducting of stabilization.
As shown in Fig. 2, being a kind of active leadage circuit of the prior art.Input current is sampled by resistance R02, and is controlled
Leakage current iblr processed guarantees silicon-controlled conducting so that input current is not less than VREF0/R02.The program can be complete defeated
Enter and input current is compensated in range, compensates for the shortcomings that RC scheme tail portion can not provide electric current.Due to needing to guarantee input
Electric current is not less than always VREF0/R02, this scheme the disadvantages of there are inefficiency, Wen Shenggao, and the reliability of system is generated
Adverse effect, increases cost.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of small power consumption, high-efficient leadage circuit and vent discharge flow controls
Method and LED control circuit processed, to solve technical problem of the existing technology.
The technical solution of the invention is as follows, provides a kind of leadage circuit with flowering structure, comprising:
Current regulating circuit, including adjustment manage and manage concatenated current source or/resistance with the adjustment；Exchange input warp can
Control silicon light modulator and rectifier bridge obtain input voltage to load supplying, the both ends of the current regulating circuit respectively with input voltage
High cold end connection；
It releases control circuit, is connect with the control terminal of the adjustment pipe；When the input voltage is lower than the threshold voltage
When, then make current regulating circuit generate leakage current by adjusting the control terminal of adjustment pipe, until input current or load electricity
Stream is greater than threshold current, then makes leakage current be zero by adjusting the control terminal of adjustment pipe.
Preferably, the control circuit of releasing includes input voltage detection circuit, load current detection circuit and patrols
Circuit is collected, the logic circuit is connect with the control terminal of adjustment pipe, the input voltage detection circuit sampled input voltage,
And be compared with threshold voltage, comparison result is exported to logic circuit, and the load current detection circuit samples load
Electric current, and be compared with threshold current, comparison result is exported to logic circuit, and the logic circuit receives the input electricity
Press the comparison result of detection circuit and the comparison result of load current detection circuit.
Preferably, the control circuit of releasing includes load current detection circuit, leakage current detection circuit and patrols
Circuit is collected, the logic circuit is connect with the control terminal of adjustment pipe, and the load current detection circuit samples load current,
And be compared with threshold current, comparison result is exported to logic circuit, described in the leakage current detection circuit sampling
Leakage current, and be compared with threshold value of releasing, comparison result is exported to logic circuit, and the logic circuit receives described negative
Carry the comparison result of current detection circuit and the comparison result of leakage current detection circuit.
Preferably, judgement of the input voltage lower than the threshold voltage refers to, the load current detection circuit
It detects that the load current is less than the threshold current, after the first time, determines the input voltage lower than the threshold
Threshold voltage；The first time is the enabled current regulating circuit when load current is 0, the input electric cur- rent measure circuit inspection
The input current is measured less than the threshold current, and starts timing, when the leakage current detection circuit detect it is described
Leakage current be less than it is described release threshold value when, timing terminates, as at the first time between institute's timing.
Preferably, after the second time, then generating vent discharge when the input voltage is lower than the threshold voltage
Stream.
Another technical solution of the invention is to provide a kind of leakage current control method of following steps, comprising:
Exchange input obtains input voltage to load supplying, by current regulating circuit through controllable silicon dimmer and rectifier bridge
Both ends are connect with the high cold end of input voltage respectively, including adjustment manages and manages concatenated current source or/electricity with the adjustment
Resistance；
Control circuit of releasing is connected in the control terminal of the adjustment pipe；When the input voltage is lower than the threshold voltage
When, then make current regulating circuit generate leakage current by adjusting the control terminal of adjustment pipe, until load current is greater than threshold value
Electric current then makes leakage current be zero by adjusting the control terminal of adjustment pipe.
Preferably, judgement of the input voltage lower than the threshold voltage refers to, the load current detection circuit
It detects that the load current is less than the threshold current, after the first time, determines the input voltage lower than the threshold
Threshold voltage；The first time is the enabled current regulating circuit when load current is 0, the load current detection circuit inspection
The load current is measured less than the threshold current, and starts timing, when the leakage current detection circuit detect it is described
Leakage current be less than it is described release threshold value when, timing terminates, as at the first time between institute's timing.
Preferably, after the first delay time, then generating and releasing when the input voltage is lower than the threshold voltage
Electric current.
Another technical solution of the invention is to provide a kind of LED control circuit with flowering structure,
Using circuit structure and method of the invention, compared with prior art, have the advantage that the program of the present invention can
Applied to Linear Driving scheme, the threshold voltage is zero-crossing values, and when input voltage zero passage, load current is zero at this time,
Second time was set as delay time, enables leakage current, when controllable silicon dimmer conducting, to be greater than input current
Electric current is maintained, leakage current is greater than the maintenance electric current of controllable silicon dimmer, for maintaining the conducting of controllable silicon dimmer；Work as load
When electric current is greater than the maintenance electric current of controllable silicon dimmer, leakage current is not enabled, and reduces power consumption, and the present invention is guaranteeing light modulation effect
Under the premise of fruit, the power consumption of leadage circuit is reduced, system effectiveness and system reliability are improved.
Detailed description of the invention
Fig. 1 is the LED control circuit including passive leadage circuit of the prior art；
Fig. 2 is the LED control circuit including active leadage circuit of the prior art；
Fig. 3 is the electrical block diagram of leadage circuit embodiment one；
Fig. 4 is one flow diagram of leadage circuit embodiment；
Fig. 5 is two circuit structure diagram of leadage circuit embodiment；
Fig. 6 is two flow diagram of leadage circuit embodiment；
Fig. 7 is two working waveform figure of leadage circuit embodiment；
Fig. 8 is leadage circuit embodiment three-circuit structure chart；
Fig. 9 (a) is that leadage circuit embodiment three obtains first time T1 flow diagram；
Fig. 9 (b) is three flow diagram of leadage circuit embodiment；
Figure 10 is three working waveform figure of leadage circuit embodiment；
Specific embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any substitution made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order to make the public have thorough understanding to the present invention, it is described in detail in the following preferred embodiment of the present invention specific
Details, and the present invention can also be understood completely in description without these details for a person skilled in the art.
The present invention is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing is adopted
With more simplified form and using non-accurate ratio, only to facilitate, lucidly aid in illustrating the embodiment of the present invention
Purpose.
Refering to what is shown in Fig. 3, illustrating the circuit structure of leadage circuit embodiment one of the invention, linear drive is applied to it
For in dynamic LED control circuit.LED control circuit includes leadage circuit and LED drive circuit, the leadage circuit by with
In solve under controllable silicon dimmer as input current it is too small caused by flicker problem, and overcome skill present in the prior art
Art defect.Its input power is exchange input, and the exchange input exports straight after controllable silicon dimmer U02 and rectifier bridge U01
The input voltage vrec of stream, i.e., as the input voltage of LED load.Exchange input is connected to whole by controllable silicon dimmer U02
Bridge U01 is flowed, the positive output end of rectifier bridge is connect with the anode of diode D00, LED drive circuit anode and the diode D00
Cathode connection.Certain capacitive can be presented in usual LED drive circuit, therefore, two poles are added between vrec and LED drive circuit
Pipe D00；When the absolute value of exchange input reduces, due to capacitive, voltage can reduce relatively slow LED drive circuit, be added
Vrec voltage follow can be exchanged the absolute value of input with the sampling resistor of input voltage vrec detection circuit by diode D00,
To guarantee the accuracy sampled to input voltage.
The leadage circuit includes current regulating circuit and control circuit of releasing, and the current regulating circuit includes adjusting
Homogeneous tube M00 and concatenated current source I10 is managed with the adjustment, resistance also can be used and concatenated form is managed in adjustment.Current source
One end of I10 is connected to the positive output end of rectifier bridge, and the other end of adjustment pipe M00 is connected to the negative output terminal of rectifier bridge U01.When
Input voltage vrec is lower than threshold voltage, then logic circuit U12 controls current regulating circuit and generates leakage current, the vent discharge
Stream is iblr, and leakage current is always existed, until load current iin2 is greater than threshold current, the logic circuit U12
Controlling leakage current is 0.
The control circuit of releasing is connect with the control terminal of the adjustment M00 pipe；It is examined by input voltage detection circuit
Input voltage vrec is surveyed, when the input voltage vrec is lower than the threshold voltage, then adjusts the control of pipe M00 by adjusting
So that current regulating circuit generates leakage current, it is electric until loading to detect load current iin2 by load current detection circuit at end
Stream is greater than threshold current, then makes leakage current iblr be zero by adjusting the control terminal of adjustment pipe.The leakage current inspection
Slowdown monitoring circuit is used to flow through the leakage current iblr of current regulating circuit, can be with by detection leakage current iblr in conjunction with timing
At the time of judging input voltage lower than threshold voltage.
When input voltage vrec is lower than threshold voltage, be delayed the second time T2, then enabled leakage current, can reduce most
The big angle of flow, thus the power consumption of releasing when reducing the big angle of flow.Threshold voltage ordinary circumstance in the present embodiment refers to zero crossing,
But according to the reality of circuit, then and zero point has certain deviation, for example, the introducing of diode D00, then zero crossing one at this time
As be diode D00 forward conduction pressure drop.
Refering to what is shown in Fig. 4, illustrating the flow diagram of leadage circuit embodiment shown in Fig. 3 one, detailed process is as follows: first examining
Survey whether input voltage vrec is lower than threshold voltage, if so, the second time T2 of delay, if otherwise continuing to test input voltage
vrec；It is delayed after T2, so that leakage current is enabled, i.e. generation leakage current iblr；It is then detected that load current iin2 whether
Not less than threshold current, the threshold current is generally higher than the maintenance electric current of controllable silicon dimmer, if then continuing to test negative
Electric current iin2 is carried, if it is not, enabling leakage current iblr not, i.e., so that leakage current is zero.
Refering to what is shown in Fig. 5, illustrating the circuit structure of leadage circuit embodiment two of the invention, linear drive is applied to it
For in dynamic LED control circuit.Embodiment one and embodiment two the difference is that, wherein the control circuit of releasing
Including input voltage detection circuit and load current detection electric current, leakage current detection circuit is not used, while will input electricity
Press the structure of detection circuit and load current detection electric current more specific.
Input voltage detection circuit passes through electric resistance partial pressure, sampled input voltage vrec, sampled voltage and reference voltage VREF1
Compare, when sampled voltage is greater than reference voltage VREF1, then the output ZVD of comparator U10 is low；When sampled voltage is less than ginseng
When examining voltage VREF1, the output ZVD of comparator U10 is height.Input voltage vrec detection circuit is used to detect the mistake of input voltage
Zero point.Since certain capacitive can be presented in LED drive circuit, diode D00 is added between vrec and LED drive circuit.
When the absolute value of exchange input reduces, due to capacitive, voltage can reduce relatively slow LED drive circuit, joined two poles
Vrec voltage follow can be exchanged the absolute value of input with the sampling resistor of input voltage vrec detection circuit by pipe D00, to protect
Demonstrate,prove the accuracy sampled to input voltage.Input voltage vrec detection circuit is not limited only to the mode in the embodiment, other are defeated
Entering voltage detecting mode can also use in the embodiment involved in the embodiment below.When LED drive circuit is linear
When circuit, it can be adopted by the way that sampling resistor R40 is added between the negative output terminal of the output end in LED drive circuit to rectifier bridge
Sample LED current, since the electric current of input voltage vrec detection circuit is much smaller than LED current, is passed through when diode D00 conducting
The electric current of sampling resistor R40 is approximately electric current iin2.Especially when LED current is larger, it is equal to electric current by the electric current of resistance R40
iin2.The sampled voltage of sampling resistor R40 is RS, is connected to the negative input end of comparator U40, the positive input terminal of comparator U40
Meet reference voltage VREF4.When RS voltage is greater than VREF4, the output ZC of comparator U40 is low；Otherwise U40 output is height.It is negative
The detection mode for carrying electric current iin2 is not limited only to the mode in the embodiment, since Linear Driving is employed herein, uses
The mode of sampling resistor is come to detect electric current be eaily.
Refering to what is shown in Fig. 6, illustrating the flow diagram of leadage circuit embodiment shown in Fig. 5 two, linear drive is applied to it
For in dynamic LED control circuit.Refering to what is shown in Fig. 7, illustrating the work wave of leadage circuit embodiment two.In conjunction with Fig. 6 and 7
The course of work and signal corresponding relationship of embodiment two is further described.
The output ZVD of input voltage vrec detection circuit and the output ZC of load current iin2 detection circuit are all connected to patrol
Circuit U 12 is collected, the output of logic circuit U12 is connected to the input of leadage circuit.Logic circuit judges that input voltage vrec is detected
Whether the output ZVD of circuit is height, i.e. whether detection input voltage vrec is lower than certain value (generally zero crossing), when ZVD is
Height, then be delayed the second time T2, and output VG is drawn high, i.e. the t11 moment in Fig. 7 (that delay T2 is not added in waveform diagram).It is suitable
It can be used for reducing TRIAC maximum conduction angle when lengthening T2, the power consumption of releasing when can further decrease the big angle of flow.At this point, by
It is less than the forward conduction voltage drop VF of LED load in voltage vrec, therefore LED current is zero, i.e. ZC is height.Between t11-t12,
Since controllable silicon dimmer does not turn on, input voltage vrec be it is low, VG be always it is high, leadage circuit is enabled, but leakage current
It is 0.At the t12 moment, controllable silicon dimmer conducting, since input voltage vrec is lower than the forward conduction voltage drop VF of LED load,
LED current is 0, i.e. iin2=iLED=0, iin3=iblr, and the electric current iblr of leadage circuit is for maintaining controllable silicon dimmer
Conducting.It is still high that pressure drop RS, which is zero, ZC, on resistance R40.At the t13 moment, when the positive pressure that input voltage vrec reaches LED is led
Lead to pressure drop, have electric current in LED load, and the electric current can maintain silicon-controlled normally, at this point, ZC signal is become by height
Low, the output VG of logic circuit is lower by height, and leadage circuit does not enable, switching tube M00 shutdown, leakage current 0.In t13-
T14 moment, input voltage vrec are always more than the positive pressure conduction voltage drop VF of LED.At the t14 moment, input voltage vrec is less than LED
Positive pressure conduction voltage drop VF, LED current 0, and leadage circuit does not enable, therefore input current iin3 is also 0, when t15
It carves, ZVD is height, and leadage circuit is enabled.
Refering to what is shown in Fig. 8, illustrating the circuit structure of leadage circuit embodiment three of the invention, linear drive is applied to it
For in dynamic LED control circuit.Embodiment three and embodiment two the difference is that, the two judges that input voltage vrec is low
Different in the mode of threshold voltage (i.e. zero crossing), for embodiment two by way of directly comparing, embodiment three then passes through timing
Mode, advantage is without electric resistance partial pressure sampling is carried out, since the divider resistance in embodiment two needs high-tension resistive, and high
Piezoresistance is at high cost in the chip, and poor with low resistance matching, is unfavorable for the integrated of circuit.It needs to sample vent discharge simultaneously
Timing node of the road as judgement, therefore on the basis of example 2, increase leadage circuit detection circuit.
With reference to shown in Fig. 9 (a), illustrate to obtain the flow chart element of first time T1 in leadage circuit embodiment three of the invention
Figure, wherein first time T1 be load current iin2 zero crossing (from electric current be greater than 0 to electric current be 0) to input voltage vrec mistake
Time between zero point.CTL signal in logic circuit is for recording whether logic circuit has kept first time T1.When
When CTL=1, T1 is not kept in expression, is also sampled to first time T1；As CTL=0, T1 has been kept in expression.
When system is initial, CTL=1.When vrec is greater than the forward conduction voltage drop VF of diode, then load current iin2 has electric current, than
Output ZC compared with device U40 is low；When vrec is less than VF, then it is height that load current iin2, which is 0, ZC, and logic circuit U12 is enabled to be let out
Discharge stream, i.e. control VG are height.Unlike embodiment two, when being sampled to first time T1, in the t14- of Fig. 7
T15 moment, leadage circuit still enable, and resistance R50 detects the electric current on leadage circuit, when leakage current iblr is 0, compare
The output ZCBLD of device U50 is height.At this point, logic circuit U12 record between the rising edge of ZC and the rising edge of ZCBLD when
Between, it is recorded as T1, and T1 is saved in logic circuit U12.After logic circuit U12 has saved first time T1, CTL is set to
It is 0, and at the t14-t15 moment, leadage circuit is not enabled.
With reference to shown in Fig. 9 (b), illustrate in leadage circuit embodiment three of the invention, after obtaining first time T1, detection
The flow diagram of input voltage vrec zero crossing.Since one of purpose of embodiment two and three seeks to judge input voltage
The signal relation of the zero crossing of vrec, the two can be combined with each other or replace.Therefore in this attached drawing, the corresponding signal in Fig. 8 is used
The comparison result ZVD for coming input voltage and threshold voltage in phenogram 5, corresponding signal is substituted into.When logic circuit
After keeping T1, then it can not detect vrec voltage and obtain ZVD signal.ZVD=0 when initial, i.e. expression input voltage vin are
Height, logic circuit U12 judge whether LED drive circuit has electric current, that is, judge whether ZC signal is 1, when LED drive circuit electric current
It is 0, then ZC=1 is delayed after T1, then ZVD=1, i.e., expression input voltage is 0 to get having arrived input voltage zero cross signal.Continue
Judge ZC signal, when the absolute value of input voltage is greater than LED pressure drop VF, then LED drive current has electric current, i.e. ZC=0, then ZVD
=0.ZVD signal is updated to the flow diagram in Fig. 6, the flow diagram of Fig. 6 can be obtained.
Refering to what is shown in Fig. 10, illustrating the work wave of leadage circuit embodiment three of the invention.Based on the present embodiment
Waveform is slightly different with embodiment two, but is consistent the technical issues of its solution with the resolving ideas of technical problem.
In addition to this, although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in this field
Those of ordinary skill apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and record is not known
Content, then can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (7)
1. a kind of leadage circuit, it is characterised in that: include:
Current regulating circuit, including adjustment manage and manage concatenated current source or/resistance with the adjustment；Exchange input is through silicon-controlled
Light modulator and rectifier bridge obtain input voltage to load supplying, the both ends of the current regulating circuit respectively with the height of input voltage
Cold end connection；
It releases control circuit, is connect with the control terminal of the adjustment pipe；When the input voltage is lower than threshold voltage, then pass through
Adjust adjustment pipe control terminal make current regulating circuit generate leakage current, until load current be greater than threshold current, then lead to
The control terminal for overregulating adjustment pipe makes leakage current be zero；
Judgement of the input voltage lower than the threshold voltage refers to, detects that the load current is less than the threshold value electricity
Stream determines the input voltage lower than the threshold voltage after the first time；The first time is, in load current
Current regulating circuit is enabled when being 0, the load current detection circuit detects that the load current is less than the threshold current,
And start timing, when the leakage current, which is less than, releases threshold value, timing terminates, as at the first time between institute's timing.
2. leadage circuit according to claim 1, it is characterised in that: the control circuit of releasing includes load current inspection
Slowdown monitoring circuit, leakage current detection circuit and logic circuit, the logic circuit are connect with the control terminal of adjustment pipe, and described is negative
It carries current detection circuit and samples load current, and be compared with threshold current, comparison result is exported to logic circuit, described
Leakage current detection circuit sample the leakage current, and be compared with threshold value of releasing, comparison result is exported to logic
Circuit, the logic circuit receive the comparison result of the load current detection circuit and the comparison knot of leakage current detection circuit
Fruit.
3. leadage circuit according to claim 1 or 2, it is characterised in that: when the input voltage is lower than the threshold value electricity
When pressure, after the second time, then leakage current is generated.
4. a kind of leakage current control method, it is characterised in that: the following steps are included:
Exchange input obtains input voltage to load supplying, by the both ends of current regulating circuit through controllable silicon dimmer and rectifier bridge
It is connect respectively with the high cold end of input voltage, including adjustment manages and manages concatenated current source or/resistance with the adjustment；
Control circuit of releasing is connected in the control terminal of the adjustment pipe；When the input voltage is lower than threshold voltage, then lead to
Overregulate adjustment pipe control terminal make current regulating circuit generate leakage current, until load current be greater than threshold current, then
Control terminal by adjusting adjustment pipe makes leakage current be zero；
Judgement of the input voltage lower than the threshold voltage refers to, detects that the load current is less than the threshold value electricity
Stream determines the input voltage lower than the threshold voltage after the first time；The first time is, in load current
Current regulating circuit is enabled when being 0, the load current detection circuit detects that the load current is less than the threshold current,
And start timing, when the leakage current, which is less than, releases threshold value, timing terminates, as at the first time between institute's timing.
5. leakage current control method according to claim 4, it is characterised in that: when the input voltage is lower than the threshold
When threshold voltage, after the second time, then leakage current is generated.
6. a kind of LED control circuit, it is characterised in that: include: LED drive circuit and the above claim 1-3 any one let out
Electric discharge road, the LED drive circuit are linear drive circuit.
7. LED control circuit according to claim 6, it is characterised in that: connect between input voltage and LED drive circuit
It is connected to diode, the anode of the diode connects the input voltage, and cathode is connect with the LED drive circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610947259.6A CN106358337B (en) | 2016-10-26 | 2016-10-26 | Leadage circuit and leakage current control method and LED control circuit |
| US15/394,956 US10153684B2 (en) | 2016-10-26 | 2016-12-30 | Bleeder circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610947259.6A CN106358337B (en) | 2016-10-26 | 2016-10-26 | Leadage circuit and leakage current control method and LED control circuit |
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| CN106358337A CN106358337A (en) | 2017-01-25 |
| CN106358337B true CN106358337B (en) | 2019-03-08 |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |