CN106332374B - A kind of leadage circuit and leakage current control method and LED control circuit - Google Patents
A kind of leadage circuit and leakage current control method and LED control circuit Download PDFInfo
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- CN106332374B CN106332374B CN201610946221.7A CN201610946221A CN106332374B CN 106332374 B CN106332374 B CN 106332374B CN 201610946221 A CN201610946221 A CN 201610946221A CN 106332374 B CN106332374 B CN 106332374B
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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]
- H05B45/30—Driver circuits
- H05B45/357—Driver circuits specially adapted for retrofit LED light sources
- H05B45/3574—Emulating the electrical or functional characteristics of incandescent lamps
- H05B45/3575—Emulating the electrical or functional characteristics of incandescent lamps by means of dummy loads or bleeder circuits, e.g. for dimmers
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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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Abstract
The invention discloses a kind of leadage circuit and leakage current control method and LED control circuit, the program of the present invention can be applied to switch drive scheme, the threshold voltage is zero-crossing values, when input voltage zero passage, leakage current is produced so that input current is more than silicon-controlled maintenance electric current, according to the size of the wave characteristics of half cycle before and after sine wave and the input current of drive circuit, control leakage current adjusts whether circuit enables, the present invention is under the premise of dimming effect is ensured, reduce leakage current, improve system effectiveness and system reliability, be conducive to increase TRIAC maximum conduction angles at the same time, it is easier the requirement for meeting maximum output current.
Description
Technical field
The present invention relates to power electronics field, and in particular to a kind of leadage circuit and leakage current control method and
LED control circuit.
Background technology
LED light since it is than traditional more energy efficient environmental protection of 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 application of the LED light to replace incandescent lamp, due in controlled silicon conducting,
Its output end voltage has larger voltage change ratio (dv/dt), causes to produce larger surge current in input terminal.This surge
Current oscillation amplitude is big, and the duration is short, easily causes silicon-controlled mistake to turn off, and influences the steady operation of LED drive circuit, makes
LED light produces flicker；In addition, the input current of silicon-controlled device, which need to be more than it, maintains electric current, electricity is maintained when input current is less than
During stream, silicon-controlled shut-off is easily caused, also results in the flicker of LED.In order to solve the above-mentioned technical problem, in the prior art
Using following scheme, but still suffer from certain technological deficiency.
As shown in Figure 1, being a kind of passive scheme of releasing of prior art, released using RC as passive.Program structure
Simply, cost is low.But it cannot simultaneously provide the silicon-controlled electric current maintained needed for conducting in power frequency period afterbody.Due to capacitance
C00 is charged to vin in controlled silicon conducting or close to vin, is discharged afterwards by resistance R00, since RC time constants are big, in half cycle
Middle part even afterbody electric discharge, reduce input current on the contrary, be unfavorable for the silicon-controlled conducting of stabilization.
A kind of as shown in Fig. 2, active leadage circuit for the prior art.Input current is sampled by resistance R02, and is controlled
Leakage current iblr processed so that input current is not less than VREF0/R02, ensures silicon-controlled conducting.The program can be complete defeated
Input current is compensated in the range of entering, compensate for the shortcomings that RC schemes afterbody can not provide electric current.Due to needing to ensure input
Electric current is not less than VREF0/R02 always, this scheme is produced there are the shortcomings of inefficiency, temperature rise for the reliability of system
Adverse effect, adds cost.
The content of the invention
In view of this, it is an object of the invention to provide a kind of leadage circuit and leakage current control method and LED to control
Circuit processed, to solve the technical problem that the stability of controlled silicon conducting existing in the prior art is poor, efficiency is low and power consumption is big.
The technical solution of the present invention is to provide a kind of leadage circuit with lower structure, including：
Leakage current adjusts circuit, including the current source or/resistance that adjustment is managed and connected with the adjustment pipe；Exchange input
Input voltage is obtained through controllable silicon dimmer and rectifier bridge, and circuit is adjusted to load supplying, the leakage current through drive circuit
Both ends are connected with the high cold end of input voltage respectively；
Release control circuit, be connected with the control terminal of the adjustment pipe；In the preceding half cycle of half-sinusoid, electricity is inputted when described
Force down when threshold voltage, then adjust circuit generation leakage current by adjusting the control terminal leakage current of adjustment pipe, directly
Input current to the drive circuit is more than respective threshold electric current, then leakage current adjusts circuit and do not produce leakage current；
The second half of half-sinusoid, when the input current of the drive circuit is less than respective threshold electric current, then by adjusting adjustment pipe
Control terminal cause leakage current adjust circuit produce leakage current, until the input current of the drive circuit is down to Low threshold
When, then leakage current adjusts circuit and does not produce leakage current.
Preferably, the control circuit of releasing includes enable signal generation circuit and is connected to adjustment pipe control terminal
Drive control circuit, the enable signal generation circuit produce table by detecting the input current of input voltage and drive circuit
The whether enabled signal of sign, the drive control circuit receive the characterization whether enabled signal, and control adjustment pipe accordingly
State.
Preferably, the enable signal generation circuit includes input voltage detection circuit, drive circuit input current is examined
Slowdown monitoring circuit and logic circuit, the input voltage detection circuit judge whether input voltage is less than threshold voltage, and result is defeated
Go out to the logic circuit, the input current of drive circuit input electric cur- rent measure electric circuit inspection to the drive circuit and reach
During to the Low threshold, the enabled signal of the logic circuit output characterization to the drive control circuit.
Preferably, the input current of drive circuit input electric cur- rent measure electric circuit inspection to the drive circuit is
Realize in the following way：Leakage current is sampled, obtains the sampled signal of characterization leakage current, the sampling of the leadage circuit
When signal reaches corresponding reference value, judge that the drive circuit input current reaches the Low threshold.
Preferably, the drive control circuit receives the current sampling signal for characterizing total input current, and by itself and electricity
Flow reference signal carries out Error processing, to obtain driving voltage, when leakage current adjusts circuit and enables, and the driving voltage
As adjustment management and control terminal voltage the leakage current for adjusting pipe is flowed through to adjust.
Preferably, the driving voltage can be used for the size of the input current of characterization drive circuit, by the driving
Compared with characterizing the reference voltage of threshold current, the input current that its comparative result then characterizes the drive circuit is voltage
It is no to reach threshold current.
Preferably, the drive control circuit includes error amplifier and first comparator, error amplification
The first input end of device receives the current sampling signal of the total input current of characterization, its second input terminal receives the electric current ginseng
Signal is examined, its output terminal outputting drive voltage, is connected, institute in the output terminal of error amplifier through switching with adjusting the control terminal of pipe
The control terminal for stating switch receives the whether enabled signal of characterization；Meanwhile the first input end of the first comparator receives the drive
Dynamic voltage, its second input terminal receive the reference voltage of the characterization threshold current, the output terminal output characterization of first comparator
Whether the input current of drive circuit reaches the signal of threshold current, and to obtain it is corresponding whether enabled signal.
Preferably, the drive circuit input electric cur- rent measure circuit includes add circuit and the second comparator, it is described
Add circuit receive respectively characterize total input current current sampling signal and characterization leakage current current sampling signal, institute
Two current sampling signal directions receiving on the contrary, therefore the signal of add circuit output characterization drive circuit input current,
The first input end of second comparator receives the reference signal of characterization Low threshold, its second end receives the characterization drive circuit
The signal of input current, the output terminal of the second comparator are connected with the logic circuit.
Preferably, when the input voltage is less than the threshold voltage, after first time, then vent discharge is produced
Stream.
Another technical solution of the present invention is to provide a kind of leadage circuit with lower structure, including：
Leakage current adjusts circuit, including the current source or/resistance that adjustment is managed and connected with the adjustment pipe；Exchange input
Input voltage is obtained through controllable silicon dimmer and rectifier bridge, and circuit is adjusted to load supplying, the leakage current through on-off circuit
Both ends are connected with the high cold end of input voltage respectively；
Release control circuit, be connected with the control terminal of the adjustment pipe；In the preceding half cycle of half-sinusoid, electricity is inputted when described
Force down when threshold voltage, then adjust circuit generation leakage current by adjusting the control terminal leakage current of adjustment pipe, directly
Input current to the drive circuit is more than respective threshold electric current, then leakage current adjusts circuit and do not produce leakage current；
The second half of half-sinusoid, when the input current of the drive circuit is less than respective threshold electric current, then controls the driving electricity
Road is not enabled or cuts off drive circuit circuit.
The another technical solution of the present invention is to provide a kind of leakage current control method of following steps, including：
Exchange input obtains input voltage to load supplying through controllable silicon dimmer and rectifier bridge, and leakage current is adjusted electricity
The both ends on road are connected with the high cold end of input voltage respectively, the leakage current adjust circuit include adjustment pipe and with it is described
Adjust the current source or/resistance of pipe series connection；
Control circuit of releasing is connected with the control terminal of the adjustment pipe；In the preceding half cycle of half-sinusoid, when the input
When voltage is less than threshold voltage, then circuit generation leakage current is adjusted by adjusting the control terminal leakage current of adjustment pipe,
Until the input current of the drive circuit is more than respective threshold electric current, then leakage current adjusts circuit and does not produce leakage current；
In the second half of half-sinusoid, when the input current of the drive circuit is less than respective threshold electric current, then adjusted by adjusting
The control terminal of pipe causes leakage current to adjust circuit and produce leakage current, until the input current of the drive circuit is down to low threshold
During value, then leakage current adjusts circuit and does not produce leakage current.
Preferably, in the preceding half cycle of half-sinusoid, first judge whether the input voltage is less than threshold voltage, if so,
Then the leakage current adjusts circuit and enables, and produces leakage current；Judge whether the input current of the drive circuit is big again
In respective threshold electric current, if so, then the leakage current adjusting circuit does not enable；Judge whether into the later half of half-sinusoid
Week, if so, then determining whether the input current of the drive circuit is less than respective threshold electric current, if so, then described let out
Discharge stream adjusts circuit and enables, if the input current of the drive circuit is further below Low threshold, the leakage current tune
Economize on electricity road does not enable.
The another technical solution of the present invention is to provide a kind of leakage current control method of following steps, including：
Exchange input obtains input voltage to load supplying through controllable silicon dimmer and rectifier bridge, and leakage current is adjusted electricity
The both ends on road are connected with the high cold end of input voltage respectively, the leakage current adjust circuit include adjustment pipe and with it is described
Adjust the current source or/resistance of pipe series connection；
Control circuit of releasing is connected with the control terminal of the adjustment pipe；In the preceding half cycle of half-sinusoid, when the input
When voltage is less than threshold voltage, then circuit generation leakage current is adjusted by adjusting the control terminal leakage current of adjustment pipe,
Until the input current of the drive circuit is more than respective threshold electric current, then leakage current adjusts circuit and does not produce leakage current；
In the second half of half-sinusoid, when the input current of the drive circuit is less than respective threshold electric current, then the driving is controlled
Circuit is not enabled or cuts off drive circuit circuit.
Another technical solution of the present invention is to provide a kind of LED control circuit with lower structure, and any of the above is a kind of
Leadage circuit and LED drive circuit, the LED drive circuit are on-off circuit or linear drive circuit.
Circuit structure using the present invention and method, compared with prior art, have the following advantages：The program of the present invention can
Applied to switch drive scheme, the threshold voltage is zero-crossing values, when input voltage zero passage, produce leakage current so that
Input current is more than silicon-controlled maintenance electric current, according to the input of the wave characteristics of half cycle before and after sine wave and drive circuit electricity
The size of stream, control leakage current adjust whether circuit enables, and the present invention reduces vent discharge under the premise of dimming effect is ensured
Stream, improves system effectiveness and system reliability, while is conducive to increase TRIAC maximum conduction angles, it is easier to meets maximum defeated
Go out the requirement of electric current.
Brief description of the drawings
Fig. 1 is the LED control circuit for including passive leadage circuit of the prior art；
Fig. 2 is the LED control circuit for including active leadage circuit of the prior art；
Fig. 3 is the structure diagram of the embodiment one of leadage circuit of the present invention；
Fig. 4 is the circuit structure diagram of drive control circuit；
Fig. 5 is the FB(flow block) of the embodiment of the present invention one；
Fig. 6 is the working waveform figure of the embodiment of the present invention one；
Fig. 7 is the structure diagram of the embodiment two of leadage circuit of the present invention；
Fig. 8 is the structure diagram of the embodiment three of leadage circuit of the present invention；
Fig. 9 is the FB(flow block) of the embodiment of the present invention two, three；
Figure 10 is the working waveform figure of the embodiment of the present invention two, three.
Figure 11 is the structure diagram of the embodiment of the present invention four.
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 replacement made in the spirit and scope of the present invention, modification, equivalent method and scheme.
Thoroughly understand to make the public have the present invention, be described in detail in present invention below preferred embodiment specific
Details, and description without these details can also understand the present invention completely for a person skilled in the art.
More specifically description is of the invention by way of example referring to the drawings in the following passage.It should be noted that attached drawing is adopted
Non-accurate ratio is used with more simplified form and, only to convenience, lucidly aid in illustrating the embodiment of the present invention
Purpose.
Refering to what is shown in Fig. 3, illustrating the circuit structure of the leadage circuit embodiment one of the present invention, driving electricity is applied to it
Exemplified by the LED control circuit of road driving, while it also can be suitably used for Linear Driving scheme.LED control circuit includes leadage circuit
And LED drive circuit, the leadage circuit be used to solve the sudden strain of a muscle as caused by input current is too small under controllable silicon dimmer
Bright problem, and overcome the technological deficiency present in the prior art.Its input power inputs for exchange, and the exchange input is through controllable
The input voltage of the input voltage vrec, i.e. drive circuit of direct current are exported after silicon light modulator U02 and rectifier bridge U01.Exchange input
Rectifier bridge U01 is connected to by controllable silicon dimmer U02, the positive output end of rectifier bridge is connected with the anode of diode D00, driving
Circuit anode is connected with the cathode of the diode D00.Since certain capacitive may be presented in LED drive circuit,
Diode D00 is added between vrec and LED drive circuit；When the absolute value of exchange input reduces, LED drive circuit is due to tool
There is capacitive, its voltage can reduce relatively slow, and the sampling resistor for adding diode D00 and input voltage vrec detection circuits can will
The absolute value of vrec voltage follows exchange input, so as to ensure the accuracy to input voltage sampling.
The leadage circuit includes leakage current and adjusts circuit and control circuit of releasing, and the leakage current adjusts electricity
Road includes adjustment pipe M00 and the current source I 10 to connect with the adjustment pipe, can also use resistance and adjust the shape that pipe is connected
Formula.One end of current source I10 is connected to the positive output end of rectifier bridge, and the other end of adjustment pipe M00 is connected to the negative of rectifier bridge U01
Output terminal.Release control circuit, be connected with the control terminal of the adjustment pipe.
In the preceding half cycle of half-sinusoid, when input voltage vrec is less than threshold voltage (may be configured as zero-crossing values), then through patrolling
Collect circuit U 12 and circuit generation leakage current is adjusted by drive control circuit U18 control leakage currents, the leakage current is
Iblr, and leakage current is existed always, until the input current iin2 of drive circuit is more than respective threshold electric current, then release
Current regulating circuit does not produce leakage current；In the second half of half-sinusoid, when the input current iin2 of the drive circuit is low
When respective threshold electric current, then circuit generation leakage current is adjusted by adjusting the control terminal leakage current of adjustment pipe M00,
When the input current of the drive circuit is down to Low threshold (VREF6 characterizes high-low threshold value), then leakage current adjusts circuit
Do not produce leakage current.
When input voltage vrec is less than threshold voltage, be delayed first time T1, then enabled leakage current adjust circuit with
Leakage current, can reduce maximum conduction angle, so that the power consumption of releasing when reducing the big angle of flow.Threshold voltage in the present embodiment
Ordinary circumstance refers to zero crossing, but according to the reality of circuit, then and zero point has certain deviation, for example, diode D00's draws
Enter, then zero crossing at this time is generally the pressure drop of diode D00 forward conductions.
The control circuit of releasing includes enable signal generation circuit and is connected to the drive control of adjustment pipe control terminal
Circuit U 18, the enable signal generation circuit are produced by detecting the input current iin2 of input voltage vrec and drive circuit
Characterization whether enabled signal EN, the drive control circuit U18 receive the characterization whether enabled signal EN, and control accordingly
The state of system adjustment pipe M00.I.e. when leakage current, which adjusts circuit, to be enabled, drive control circuit U18 control leakage currents are adjusted
The grid voltage of pipe M00 is adjusted in circuit, by the size for controlling leakage current iblr so that total input current iin3 is not less than
Setting value (the maintenance electric current of controllable silicon dimmer).Disconnect drive control circuit U18 and adjust circuit control terminal with leakage current
Connection may be such that leakage current adjusts circuit and do not enable, therefore, enabling and not enabled available adjustment pipe in the present embodiment
Whether control terminal receives driving voltage to characterize, but is not limited to a kind of this mode.
The enable signal generation circuit includes several functional circuits, i.e., including input voltage detection circuit, drive circuit
Input electric cur- rent measure circuit and logic circuit, in the present embodiment, the input voltage detection circuit judges input voltage vrec
Whether it is less than threshold voltage (being characterized with VREF1), is compared by comparator U10, result is inputted to the logic circuit, when
Input voltage vrec is less than threshold voltage, then it is high level that comparator U10, which exports ZVD signals, and causes signal through logic circuit
EN characterizations are enabled.In this attached drawing, it is input current iin2 detection circuits to be labelled with drive circuit input electric cur- rent measure circuit, can
According to the input current iin2 of drive circuit, and compared with Low threshold (being characterized with VREF6), drive circuit input electricity is judged
Whether stream is less than threshold value；Judge whether drive circuit input current is higher than threshold value according to V8H in drive control circuit, it compares knot
Fruit is inputted to the logic circuit, by the whether enabled signal EN to the drive control circuit U18 of logic circuit output characterization.
Sampling resistor and drive circuit series connection can be detected iin2 by drive circuit input electric cur- rent measure circuit, still, in order to reduce
System power dissipation, in the present embodiment, to judge that drive circuit inputs indirectly by total input current iin3 and leakage current iblr
Electric current iin2, resistance R60 sample total input current iin3, obtain sampled voltage RS3, resistance R50 sampling leakage current iblr, obtain
To sampled voltage RS2, RS3 is negative voltage, and RS2 is positive voltage.Therefore RS2 can be added with RS3 with add circuit U60, and
Its absolute value is taken, when iin2 is close to 0, the output of add circuit U60 is also close to 0.The output terminal of add circuit U60 is connected to ratio
Compared with the negative input end of device U61, the positive input terminal connection Low threshold reference signal VREF6 of the second comparator U61, works as input current
When iin2 is less than threshold value, then the output ZC of the second comparator U61 is height, then EN is low to control the leakage current to adjust circuit
Do not enable.In the present embodiment, the Low threshold can be arranged to to level off to zero value, then, reference signal VREF6
Level off to zero, when being less than Low threshold because of input current iin2, drive circuit input current is close to 0, so can be not required at this time
Controllable silicon dimmer turns on, so being enabled without leadage circuit.
Refering to what is shown in Fig. 4, illustrate the concrete structure of drive control circuit in embodiment one.The drive control circuit
U18 includes error amplifier U82 and the first input end of first comparator U83, the error amplifier U82 receive the table
The current sampling signal RS3 of input current is levied, its second input terminal receives the current reference signal VREF81, its output terminal is defeated
Go out driving voltage V8, be connected in the output terminal of error amplifier U82 through switching K80 with adjusting the control terminal of pipe M00, the switch
The control terminal of K80 receive characterization whether enabled signal EN；Meanwhile described in the first input end reception of first comparator U83
Driving voltage V8, its second input terminal receive the reference voltage VREF82 of the characterization threshold current, and first comparator U83's is defeated
The signal of the input current iin2 sizes of outlet output characterization drive circuit, and to obtain it is corresponding whether enabled signal
EN。
Because of driving voltages of the driving voltage V8 as adjustment pipe, its size determines the size of leakage current, therefore, can be with
Judge the size of leakage current by detecting the driving voltage V8 in drive control circuit U18, when leakage current is 0, V8
For 0；By directly detecting in leadage circuit, the voltage RS2 of leakage current can also be characterized to judge the size of leakage current.
The size of the upper voltage characterization input current iin3 of RS3, i.e. leakage current iblr add the input current of drive circuit
Iin2, when its enable signal EN is high, then amplifier U82 is by controlling its output terminal VG so that RS3 voltages are equal to reference voltage
VREF81.The reference signal VREF82 of the output of amplifier U82 and characterization threshold current is compared by first comparator U83, is obtained
Whether it is higher than threshold current to voltage V8H, the input current iin2 that voltage V8H can characterize drive circuit.When iin2 is higher than threshold
When being worth electric current, then V8H is low；When iin2 is less than threshold current, then V8H is height.
Refering to what is shown in Fig. 5, illustrate the idiographic flow block diagram of embodiment one.In the preceding half cycle of half-sinusoid, institute is first judged
State whether input voltage vrec is less than threshold voltage, i.e., whether input voltage vrec detection circuits detection input voltage is less than setting
Value, when it is less than setting value, then it exports ZVD as height, and otherwise ZVD is low.When ZVD is high, the output of logic circuit U12
EN is height, enables drive control circuit U18, drive control circuit U18 control leadage circuit and enables, and produces leakage current
iblr.Judge whether the input current iin2 of the drive circuit is more than respective threshold electric current again, if so, then V8H=0, described
Leakage current adjusts circuit and does not enable, and EN is low.Judge whether the second half into half-sinusoid, if so, then determining whether
Whether the input current iin2 of the drive circuit is less than respective threshold electric current, if so, then V8H=1, then the leakage current tune
Economize on electricity road enables, if the input current of the drive circuit further below Low threshold, i.e. leakage current iblr is higher than threshold value, drives
Dynamic circuit input current is close to 0, so controllable silicon dimmer can be not required to turn at this time, then the leakage current adjusts circuit
Do not enable.
Refering to what is shown in Fig. 6, illustrate the work wave of embodiment one.When controllable silicon dimmer turns off, input current iin is
0, and VG is adjusted to ceiling voltage, the t31 moment in corresponding diagram 6, since input side has capacitive device, on the capacitive device
Certain voltage can be remained, so leakage current iblr has current impulse, input current iin3 has current impulse., can at the t32 moment
Silicon dimmer conduction is controlled, input voltage vin voltages are equal to AC-input voltage, when input current iin3 is less than setting value, then drive
Dynamic control circuit U18 adjusts the grid of pipe M00 by controlling so that leakage current iblr is not less than plus input current iin2 to be set
Definite value, i.e. iin3 are not less than setting value, which is slightly above controllable silicon dimmer as threshold current, the threshold current
Maintain electric current.When input current iin3 is low higher than threshold value, that is, V8H, i.e. the input current iin2 of drive circuit, which is more than or equal to, to be set
During definite value, then the output EN of logic circuit is 0, that is, it is low to control the output VG of drive control circuit U18, leadage circuit is not made
Energy.So as to reduce the power consumption of leadage circuit.It can judge the big of leakage current by detecting the V8 in drive control circuit U18
It is small, when leakage current is 0, V8 0；Can also be by directly detecting in leadage circuit, the voltage RS2 for characterizing leakage current comes
Judge the size of leakage current.In the later half cycle of half-sinusoid, in moment t33, when input current iin2 is less than setting value
(judge or judged by RS2 by V8H), then the output EN of logic circuit is height, that is, controls drive control circuit U18's
K80 conductings are switched, enable leadage circuit.In moment t34, AC-input voltage is reduced to 0, input current 0, i.e. driving electricity
The input current iin2 on road is equal to iblr for 0, iin3, then the output EN of logic circuit is 0, and drive control circuit VG is 0,
Leadage circuit is not enabled.
Refering to what is shown in Fig. 7, illustrate the particular circuit configurations of leadage circuit embodiment two of the present invention.Embodiment two is with implementing
The difference of example one is：In the second half of half-sinusoid, when the input current iin2 of drive circuit is less than threshold current,
Leakage current adjusts circuit and does not enable, and the confession that logic circuit control drive circuit is not enabled or disconnection is to drive circuit
Electricity, the present embodiment are the input terminal addition switch K10 in drive circuit, turn off switch K10.The embodiment is according to drive
The characteristic design of dynamic circuit, further reduce power consumption, improve system effectiveness.
Refering to what is shown in Fig. 8, illustrate the particular circuit configurations of leadage circuit embodiment three of the present invention.Embodiment three is with implementing
Example two is similar, i.e. the second half in half-sinusoid, when the input current iin2 of drive circuit is less than threshold current, leakage current
Circuit is adjusted not enable, and logic circuit control drive circuit does not enable, and not enabled control drive circuit is by logic electricity
The whether enabled signal EN2 of another characterization of road direction drive circuit transmission, in these cases, EN2 is height, then drive circuit does not make
Energy.
Refering to what is shown in Fig. 9, illustrate the FB(flow block) of leadage circuit embodiment two, three of the present invention.With embodiment one and his like
The difference of journey (i.e. Fig. 5) is：In the preceding half cycle of half-sinusoid, when input voltage vrec is less than threshold voltage, first make
Signal EN2 is high or switch K10 conductings, so that drive circuit enables；In the second half of half-sinusoid, the drive circuit
Input current iin2 is less than respective threshold electric current, then V8H=1, and at this time, enable signal EN2 is low or switch K10 shut-offs.
Refering to what is shown in Fig. 10, illustrate the work wave of leadage circuit embodiment two, three of the present invention.Its work wave and reality
The difference for applying the waveform of example one is：In embodiment one, at the t33 moment, when the input current iin2 of drive circuit is less than
During predetermined value, leadage circuit is enabled；And in embodiment two, three, at the t43 moment corresponding with one t33 of embodiment, work as drive circuit
Input current iin2 when being less than predetermined value, do not enable leadage circuit, i.e., do not produce leakage current.
With reference to shown in figure 11, the circuit structure of leadage circuit example IV of the present invention is illustrated, the present embodiment is to implement
The improvement carried out in example one, the main distinction are drive circuit input electric cur- rent measure circuit.The drive circuit input electricity
Current detection circuit detects that the input current of the drive circuit is realized in the following way：Leakage current is sampled, is obtained
The sampled signal of leakage current is characterized, when the sampled signal of the leadage circuit reaches corresponding reference value, judges the drive
Dynamic circuit input current reaches the Low threshold.I.e. the present embodiment is compared by sampling leakage current indirectly with high threshold
Compared with it is achieved thereby that the comparison of drive circuit input current and Low threshold.The positive input terminal connection high threshold reference of comparator U61
Signal VREF7, when leakage current iblr is higher than threshold value, then the output ZC of comparator U61 is height, then EN is low, described in control
Leakage current adjusts circuit and does not enable.In the present embodiment, the high threshold can be arranged to level off to maintain electric current
Value, then, reference signal VREF7 also levels off to reference voltage V REF81 in drive control circuit U18, because of leakage current iblr high
When threshold value, drive circuit input current is close to 0, so controllable silicon dimmer can be not required to turn at this time, so need not let out
Electric discharge road enables.
In addition, although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in this area
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 refer to another embodiment on the books.It should be noted simultaneously that the error amplifier in the present invention can be with
Realized using operational amplifier.
Embodiments described above, does not form the restriction to the technical solution protection domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical solution
Within enclosing.
Claims (13)
- A kind of 1. leadage circuit, it is characterised in that：Including：Leakage current adjusts circuit, including the current source or resistance that adjustment is managed and connected with the adjustment pipe；Exchange input warp can Control silicon light modulator and rectifier bridge obtain input voltage and adjust the both ends of circuit to load supplying, the leakage current through drive circuit It is connected respectively with the high cold end of input voltage；Release control circuit, be connected with the control terminal of the adjustment pipe；In the preceding half cycle of half-sinusoid, when the input voltage is low When threshold voltage, then circuit generation leakage current, Zhi Daosuo are adjusted by adjusting the control terminal leakage current of adjustment pipe The input current for stating drive circuit is more than respective threshold electric current, then leakage current adjusts circuit and do not produce leakage current；In sine The second half of half-wave, when the input current of the drive circuit is less than respective threshold electric current, then adjusts the control of pipe by adjusting End processed causes leakage current to adjust circuit and produce leakage current, when the input current of the drive circuit is down to Low threshold, Then leakage current adjusts circuit and does not produce leakage current.
- 2. leadage circuit according to claim 1, it is characterised in that：The control circuit of releasing is produced including enable signal Raw circuit and the drive control circuit for being connected to adjustment pipe control terminal, the enable signal generation circuit is by detecting input voltage With the input current of drive circuit, the whether enabled signal of characterization is produced, whether the drive control circuit receives the characterization Enabled signal, and the state of control adjustment pipe accordingly.
- 3. leadage circuit according to claim 2, it is characterised in that：The enable signal generation circuit includes input voltage Detection circuit, drive circuit input electric cur- rent measure circuit and logic circuit, the input voltage detection circuit judge input electricity Whether pressure is less than threshold voltage, and result is exported to the logic circuit, drive circuit input electric cur- rent measure circuit inspection When measuring the input current of the drive circuit and reaching the Low threshold, the enabled signal of the logic circuit output characterization to institute State drive control circuit.
- 4. leadage circuit according to claim 3, it is characterised in that：The drive circuit input electric cur- rent measure circuit inspection The input current for measuring the drive circuit is realized in the following way：Leakage current is sampled, obtains characterization leakage current Sampled signal, when the sampled signal of the leadage circuit reaches corresponding reference value, judge the drive circuit input electricity Stream reaches the Low threshold.
- 5. leadage circuit according to claim 2, it is characterised in that：The drive control circuit receives the total input electricity of characterization The current sampling signal of stream, and itself and current reference signal are subjected to Error processing, to obtain driving voltage, in leakage current tune When economize on electricity road is enabled, the driving voltage flows through the leakage current for adjusting pipe as adjustment management and control terminal voltage to adjust.
- 6. leadage circuit according to claim 5, it is characterised in that：The driving voltage is used to characterize drive circuit The size of input current, by the driving voltage compared with characterizing the reference voltage of threshold current, its comparative result then table Whether the input current for levying the drive circuit reaches threshold current.
- 7. the leadage circuit according to claim 5 or 6, it is characterised in that：The drive control circuit is put including error Big device and first comparator, the first input end of the error amplifier receive the current sample of the total input current of characterization Signal, its second input terminal receive the current reference signal, its output terminal outputting drive voltage, in the output of error amplifier Control terminal of the end through switching with adjustment pipe be connected, the control terminal of the switch receive characterize whether the signal enabled；Meanwhile this The first input end of one comparator receives the driving voltage, its second input terminal receives the reference electricity of the characterization threshold current Whether pressure, the input current of the output terminal output characterization drive circuit of first comparator reach the signal of threshold current, and to Obtain it is corresponding whether enabled signal.
- 8. leadage circuit according to claim 3, it is characterised in that：The drive circuit input electric cur- rent measure circuit bag Add circuit and the second comparator are included, the add circuit receives the current sampling signal and table for characterizing total input current respectively The current sampling signal of leakage current is levied, the two current sampling signal directions received are on the contrary, therefore add circuit output The signal of drive circuit input current is characterized, the first input end of second comparator receives the reference letter of characterization Low threshold Number, its second end receives the signal of the characterization drive circuit input current, the output terminal of the second comparator and the logic circuit Connection.
- A kind of 9. leadage circuit, it is characterised in that：Including：Leakage current adjusts circuit, including the current source or resistance that adjustment is managed and connected with the adjustment pipe；Exchange input warp can Control silicon light modulator and rectifier bridge obtain input voltage and adjust the both ends of circuit to load supplying, the leakage current through drive circuit It is connected respectively with the high cold end of input voltage；Release control circuit, be connected with the control terminal of the adjustment pipe；In the preceding half cycle of half-sinusoid, when the input voltage is low When threshold voltage, then circuit generation leakage current, Zhi Daosuo are adjusted by adjusting the control terminal leakage current of adjustment pipe The input current for stating drive circuit is more than respective threshold electric current, then leakage current adjusts circuit and do not produce leakage current；In sine The second half of half-wave, when the input current of the drive circuit is less than respective threshold electric current, then controls the drive circuit not Enable or cut off drive circuit circuit.
- A kind of 10. leakage current control method, it is characterised in that：Comprise the following steps：Exchange input obtains input voltage to load supplying through controllable silicon dimmer and rectifier bridge, by the both ends of current regulating circuit It is connected respectively with the high cold end of input voltage, including the current source or resistance that adjustment is managed and connected with the adjustment pipe；Control circuit of releasing is connected with the control terminal of the adjustment pipe；In the preceding half cycle of half-sinusoid, when the input voltage During less than threshold voltage, then circuit generation leakage current is adjusted by adjusting the control terminal leakage current of adjustment pipe, until The input current of drive circuit is more than respective threshold electric current, then leakage current adjusts circuit and do not produce leakage current；Sinusoidal half The second half of ripple, when the input current of drive circuit is less than respective threshold electric current, is then made by adjusting the control terminal of adjustment pipe Leakage current adjusts circuit and produces leakage current, when the input current of drive circuit is down to Low threshold, then leakage current Adjust circuit and do not produce leakage current.
- 11. leakage current control method according to claim 10, it is characterised in that：It is first in the preceding half cycle of half-sinusoid Judge whether the input voltage is less than threshold voltage, if so, then the leakage current adjusting circuit enables, and produce vent discharge Stream；Judge whether the input current of drive circuit is more than respective threshold electric current again, if so, then the leakage current adjusts circuit not It is enabled；Judge whether the second half into half-sinusoid, if so, then determining whether the input current of drive circuit is less than Respective threshold electric current, if so, then the leakage current adjusting circuit enables, if the input current of drive circuit is further below low Threshold value, then the leakage current adjust circuit and do not enable.
- A kind of 12. leakage current control method, it is characterised in that：Comprise the following steps：Exchange input obtains input voltage to load supplying through controllable silicon dimmer and rectifier bridge, by the both ends of current regulating circuit It is connected respectively with the high cold end of input voltage, including the current source or resistance that adjustment is managed and connected with the adjustment pipe；Control circuit of releasing is connected with the control terminal of the adjustment pipe；In the preceding half cycle of half-sinusoid, when the input voltage During less than threshold voltage, then circuit generation leakage current is adjusted by adjusting the control terminal leakage current of adjustment pipe, until The input current of drive circuit is more than respective threshold electric current, then leakage current adjusts circuit and do not produce leakage current；Sinusoidal half The second half of ripple, when the input current of drive circuit is less than respective threshold electric current, then controls drive circuit not enabled or will drive Dynamic circuit loop cut-out.
- A kind of 13. LED control circuit, it is characterised in that：Including：Any one leadage circuit of above claim 1-9 and LED drive Dynamic circuit, the LED drive circuit is on-off circuit or linear drive circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610946221.7A CN106332374B (en) | 2016-10-26 | 2016-10-26 | A kind of 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 |
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| CN201610946221.7A CN106332374B (en) | 2016-10-26 | 2016-10-26 | A kind of leadage circuit and leakage current control method and LED control circuit |
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| CN106332374A CN106332374A (en) | 2017-01-11 |
| CN106332374B true CN106332374B (en) | 2018-04-17 |
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Effective date of registration: 20200107 Address after: 215600 2nd Floor, Building A, 19-2 Zhongxing Road, Zhangjiagang Economic Development Zone, Suzhou City, Jiangsu Province Patentee after: Jewart Microelectronics (Zhangjiagang) Co., Ltd. Address before: Hangzhou City, Zhejiang province Yuhang District 311121 West Street warehouse before No. 1500 Building 1 room 424 Patentee before: Jewart Microelectronics (Hangzhou) Co., Ltd. |