CN206181442U - Bleeder circuit and LED control circuit - Google Patents
Bleeder circuit and LED control circuit Download PDFInfo
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- CN206181442U CN206181442U CN201621170606.0U CN201621170606U CN206181442U CN 206181442 U CN206181442 U CN 206181442U CN 201621170606 U CN201621170606 U CN 201621170606U CN 206181442 U CN206181442 U CN 206181442U
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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 utility model discloses a bleeder circuit and LED control circuit, wherein the bleeder circuit includes: the current regulation circuit that releases, including the compensating pipe and with electric current source that the compensating pipe is established ties or / resistance, NULL obtains input voltage through triac dimmer and rectifier bridge and supplies power to the load through drive circuit, release current regulation circuit's both ends and be connected with input voltage's high cold end respectively. The utility model discloses switch driving scheme can be applied to to this scheme, threshold voltage be null value, when the input voltage zero passage, produce the bleeder current so that arrival current is greater than the maintenance current of silicon controlled rectifier, according to the wave form characteristics of half cycle around the sine wave and drive circuit's arrival current's size, controlled discharge current regulation circuit whether make can, the utility model discloses adjust luminance under the effect prerequisite in the assurance, reduced the bleeder current, improved system efficiency and system reliability, be favorable to increasing the biggest angle of flow of TRIAC simultaneously, satisfy maximum output current 's requirement more easily.
Description
Technical field
The utility model is related to electric and electronic technical field, and in particular to a kind of leadage circuit and LED control circuit.
Background technology
LED due to its environmental protection more more energy efficient than traditional fluorescent lamp and incandescent lamp, so LED is slowly replacing existing
Fluorescent lamp and incandescent lamp.In the incandescent lamp with controllable silicon dimmer, similarly wish to be replaced using LED, thus
LED needs compatible silicon controlled light modulator.But, by LED come replace incandescent lamp application in, due in controlled silicon conducting,
Its output end voltage has larger voltage change ratio (dv/dt), causes to produce larger surge current in input.This surge
Current oscillation amplitude is big, and the duration is short, easily causes silicon controlled to turn off by mistake, affects the steady operation of LED drive circuit, makes
LED produces flicker；In addition, the input current of silicon-controlled device need to be more than its maintenance electric current, when input current is less than maintenance electricity
During stream, easily cause silicon controlled to turn off, also result in the flicker of LED.In order to solve above-mentioned technical problem, in prior art
Using following scheme, but still suffer from certain technological deficiency.
As shown in figure 1, for a kind of passive scheme of releasing of prior art, being released as passive using RC.Program structure
Simply, low cost.But in power frequency period afterbody and cannot provide controllable silicon maintenance conducting required electric current.Due to electric capacity
C00 is charged to vin or close vin in controlled silicon conducting, is discharged by resistance R00 afterwards, due to RC time constants greatly, in half cycle
Middle part even afterbody electric discharge, input current is reduced on the contrary, be unfavorable for that silicon controlled is stably turned on.
As shown in Fig. 2 for a kind of active leadage circuit of prior art.By resistance R02 sampling input currents, and control
Leakage current iblr processed so that input current is not less than VREF0/R02, it is ensured that silicon controlled is turned on.The program can be complete defeated
Input current is compensated in the range of entering, compensate for RC schemes afterbody cannot provide the shortcoming of electric current.Due to needing to ensure input
Electric current is not less than always VREF0/R02, and this scheme has the shortcomings of inefficiency, temperature rise, for the reliability of system is produced
Adverse effect, increased cost.
Utility model content
In view of this, the purpose of this utility model be provide a kind of leadage circuit and leakage current control method and
LED control circuit, less stable, the technology that efficiency is low and power consumption is big of the controlled silicon conducting to solve prior art presence
Problem.
Technical solution of the present utility model is to provide a kind of leadage circuit of following structure, including：
Leakage current adjusts circuit, including adjustment is managed and adjusts current source or the/resistance that pipe is connected with described；Exchange input
Jing controllable silicon dimmers and rectifier bridge obtain input voltage Jing drive circuits to load supplying, and the leakage current adjusts circuit
Two ends are connected respectively with the high cold end of input voltage；
Release control circuit, be connected with the control end of the adjustment pipe；In the front half cycle of half-sinusoid, when the input electricity
Force down when threshold voltage, then cause leakage current to adjust circuit generation leakage current by adjusting the control end 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 end 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, described control circuit of releasing includes enabling signal generating circuit and being connected to adjusting pipe control end
Drive control circuit, the enable signal generating circuit produces table by detection input voltage and the input current of drive circuit
The signal for whether enabling is levied, the drive control circuit receives the signal for characterizing and whether enabling, and control adjustment pipe accordingly
State.
Preferably, the enable signal generating circuit includes that input voltage detection circuit, drive circuit input current are examined
Whether slowdown monitoring circuit and logic circuit, described input voltage detection circuit judges input voltage less than threshold voltage, and result is defeated
Go out to the logic circuit, described drive circuit input electric cur- rent measure electric circuit inspection reaches to the input current of the drive circuit
During to the Low threshold, the logic circuit output characterizes the signal for enabling to the drive control circuit.
Preferably, described drive circuit input electric cur- rent measure electric circuit inspection is to the input current of the drive circuit
Realize in the following way：Sampling leakage current, obtains characterizing the sampled signal of leakage current, the sampling of the leadage circuit
When signal reaches corresponding reference value, judge that described 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 described driving voltage
The leakage current for adjusting pipe is flowed through as adjustment management and control terminal voltage to adjust.
Preferably, described driving voltage can be used for the size of the input current for characterizing drive circuit, by the driving
Voltage is compared with the reference voltage for characterizing threshold current, and its comparative result then characterizes the input current of the drive circuit is
It is no to reach threshold current.
Preferably, described drive control circuit includes error amplifier and first comparator, described error is amplified
The first input end of device receives the current sampling signal for characterizing total input current, and its second input receives the electric current ginseng
Signal is examined, its output end outputting drive voltage is switched in output end Jing of error amplifier and is connected with the control end of adjustment pipe, institute
The control end for stating switch receives the signal whether sign enables；Meanwhile, the first input end of the first comparator receives the drive
Dynamic voltage, its second input receives the reference voltage for characterizing threshold current, and the output end output of first comparator is characterized
Whether the input current of drive circuit reaches the signal of threshold current, and the signal to obtain whether enabling accordingly.
Preferably, described 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 characterize leakage current current sampling signal, institute
Two current sampling signals for receiving are in opposite direction, therefore add circuit output characterizes the signal of drive circuit input current,
The first input end of second comparator receives the reference signal for characterizing Low threshold, and its second end receives the sign drive circuit
The signal of input current, the output end of the second comparator is connected with the logic circuit.
Preferably, when the input voltage is less than the threshold voltage, Jing after the very first time, then producing vent discharge
Stream.
Another technical solution of the present utility model is to provide a kind of leadage circuit of following structure, including：
Leakage current adjusts circuit, including adjustment is managed and adjusts current source or the/resistance that pipe is connected with described；Exchange input
Jing controllable silicon dimmers and rectifier bridge obtain input voltage Jing on-off circuits to load supplying, and the leakage current adjusts circuit
Two ends are connected respectively with the high cold end of input voltage；
Release control circuit, be connected with the control end of the adjustment pipe；In the front half cycle of half-sinusoid, when the input electricity
Force down when threshold voltage, then cause leakage current to adjust circuit generation leakage current by adjusting the control end 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 does not enable or cuts off in drive circuit loop.
Another technical solution of the present utility model is to provide a kind of LED control circuit of following structure, any of the above
A kind of leadage circuit and LED drive circuit, described LED drive circuit is on-off circuit or linear drive circuit.
Using circuit structure of the present utility model, compared with prior art, with advantages below：The utility model program
Can be applicable to switch drive scheme, described threshold voltage is zero-crossing values, when input voltage zero passage, produce leakage current so that
Obtain input current and maintain electric current, the wave characteristics and the input of drive circuit according to half cycle before and after sine wave more than silicon controlled
The size of electric current, control leakage current adjusts whether circuit enables, and the utility model is reduced under the premise of dimming effect is ensured
Leakage current, improves system effectiveness and system reliability, while being conducive to increasing TRIAC maximum conduction angles, it is easier to meet
The requirement of maximum output current.
Description of the drawings
Fig. 1 is the LED control circuit including passive leadage circuit of prior art；
Fig. 2 is the LED control circuit including active leadage circuit of prior art；
Fig. 3 is the structural representation of the embodiment one of the utility model leadage circuit；
Fig. 4 is the circuit structure diagram of drive control circuit；
Fig. 5 is the FB(flow block) of the utility model embodiment one；
Fig. 6 is the working waveform figure of the utility model embodiment one；
Fig. 7 is the structural representation of the embodiment two of the utility model leadage circuit；
Fig. 8 is the structural representation of the embodiment three of the utility model leadage circuit；
Fig. 9 is the FB(flow block) of the utility model embodiment two, three；
Figure 10 is the working waveform figure of the utility model embodiment two, three.
Figure 11 is the structural representation of the utility model example IV.
Specific embodiment
Preferred embodiment of the present utility model is described in detail below in conjunction with accompanying drawing, but the utility model is not merely
It is limited to these embodiments.The utility model covers any replacement made in spirit and scope of the present utility model, modification, equivalent
Method and scheme.
In order that the public has to the utility model thoroughly understand, in following the utility model preferred embodiment specifically
Clear concrete details, and for a person skilled in the art description without these details can also completely understand that this practicality is new
Type.
Referring to the drawings the utility model more particularly described below by way of example in the following passage.It should be noted that, accompanying drawing
In the form of more simplifying and using non-accurately ratio, only conveniently, lucidly to aid in illustrating the utility model
The purpose of embodiment.
With reference to shown in Fig. 3, the circuit structure of leadage circuit embodiment one of the present utility model is illustrated, be applied to drive with it
As a example by the LED control circuit of dynamic circuit drives, while also can be suitably used for Linear Driving scheme.LED control circuit includes releasing
Circuit and LED drive circuit, described leadage circuit be used to solve to be caused by input current is too small under controllable silicon dimmer
Flicker problem, and overcome the technological deficiency existing for prior art.Its input power is exchange input, the exchange input Jing
The input voltage vrec of direct current, the i.e. input voltage of drive circuit are exported after controllable silicon dimmer U02 and rectifier bridge U01.Exchange
Input is connected to rectifier bridge U01 through controllable silicon dimmer U02, and the positive output end of rectifier bridge is connected with the anode of diode D00,
Drive circuit anode is connected with the negative electrode of the diode D00.Because LED drive circuit may be presented certain capacitive, therefore,
Diode D00 is added between vrec and LED drive circuit；When exchange input absolute value reduce when, LED drive circuit due to
With capacitive, its voltage can reduce relatively slow, and the sampling resistor for adding diode D00 and input voltage vrec detection circuits can be by
The absolute value of vrec voltage follows exchange input, so as to ensure the degree of accuracy to input voltage sampling.
Described leadage circuit includes that leakage current adjusts circuit and control circuit of releasing, and described leakage current adjusts electricity
The current source I10 that road includes adjustment pipe M00 and connects with the adjustment pipe, it is also possible to using resistance and the shape of adjustment pipe series connection
Formula.One end of current source I10 is connected to the positive output end of rectifier bridge, and the other end for adjusting pipe M00 is connected to the negative of rectifier bridge U01
Output end.Release control circuit, be connected with the control end of the adjustment pipe.
In the front half cycle of half-sinusoid, when input voltage vrec is less than threshold voltage (may be configured as zero-crossing values), then Jing is patrolled
Collect circuit U 12 and leakage current regulation circuit generation leakage current is controlled by drive control circuit U 18, the leakage current is
Iblr, and leakage current is present 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 it is low
When respective threshold electric current, then leakage current is caused to adjust circuit generation leakage current by adjusting the control end 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
Leakage current is not produced.
When input voltage vrec be less than threshold voltage when, time delay very first time T1, then enable leakage current adjust circuit with
Leakage current, can reduce maximum conduction angle, so as to reduce the power consumption of releasing during 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 has certain deviation with zero point, and for example, diode D00's draws
Enter, then zero crossing now is generally the pressure drop of diode D00 forward conductions.
Described control circuit of releasing includes the drive control for enabling signal generating circuit and being connected to adjustment pipe control end
Circuit U 18, the signal generating circuit that enables is produced by the detection input voltage vrec and input current iin2 of drive circuit
The signal EN whether sign enables, the drive control circuit U 18 receives the signal EN for characterizing and whether enabling, and controls accordingly
The state of system adjustment pipe M00.I.e. when leakage current adjusts circuit to be enabled, the control leakage current of drive control circuit U 18 is 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 U 18 and adjust circuit control end with leakage current
Cause leakage current to adjust circuit by connection not enable, therefore, the enable in the present embodiment can use adjustment pipe with not enabling
Whether control end receives driving voltage to characterize, but is not limited to a kind of this mode.
The enable signal generating 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, described input voltage detection circuit judges input voltage vrec
Whether threshold voltage (being characterized with VREF1) is less than, is compared by comparator U10, result is input into the logic circuit, when
Input voltage vrec is less than threshold voltage, then comparator U10 output ZVD signals are high level, and Jing logic circuits cause signal
EN is characterized and enabled.In this accompanying drawing, drive circuit input electric cur- rent measure circuit is labelled with for input current iin2 and detects circuit, can
According to the input current iin2 of drive circuit, and it is compared with Low threshold (being characterized with VREF6), judges drive circuit input electricity
Whether stream is less than threshold value；Whether drive circuit input current is judged higher than threshold value according to V8H in drive control circuit, it compares knot
Fruit is input into the logic circuit, is exported by logic circuit and is characterized the signal EN for whether enabling to the drive control circuit U 18.
Sampling resistor and drive circuit series connection can be detected iin2 by drive circuit input electric cur- rent measure circuit, but, in order to reduce
System power dissipation, in the present embodiment, by total input current iin3 and leakage current iblr come come judge indirectly drive circuit be input into
The total input current iin3 of electric current iin2, resistance R60 sampling, obtains sampled voltage RS3, resistance R50 sampling leakage current iblr, obtains
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
Take its absolute value, when iin2 it is close 0 when, the output of add circuit U60 is also close to 0.The output end of add circuit U60 is connected to ratio
Compared with the negative input end of device U61, positive input terminal connection Low threshold reference signal VREF6 of the second comparator U61, work 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, controls the leakage current and adjusts circuit
Do not enable.In the present embodiment, described Low threshold can be set 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 close 0, so now can not need
Controllable silicon dimmer is turned on, so enabling without the need for leadage circuit.
With reference to shown in Fig. 4, the concrete structure of drive control circuit in embodiment one is illustrated.Described drive control circuit
U18 includes error amplifier U82 and first comparator U83, and the first input end of described error amplifier U82 receives the table
The current sampling signal RS3 of input current is levied, its second input receives the current reference signal VREF81, its output end is defeated
Go out driving voltage V8, be connected with the control end of adjustment pipe M00 in the output end Jing switch K80 of error amplifier U82, the switch
The control end of K80 is received and characterizes the signal EN for whether enabling；Meanwhile, the first input end of first comparator U83 receives described
Driving voltage V8, its second input receives the reference voltage VREF82 for characterizing threshold current, first comparator U83 it is defeated
Go out the signal that end output characterizes the input current iin2 sizes of drive circuit, and the signal to obtain whether enabling accordingly
EN。
Because driving voltage V8 is used as the driving voltage of adjustment pipe, its size determines the size of leakage current, therefore, it can
The size of leakage current is judged by the driving voltage V8 in detection drive control circuit U 18, when leakage current is 0, V8
For 0；Can also be by the size that in direct detection leadage circuit, characterizes the voltage RS2 of leakage current to judge leakage current.
The upper voltages of RS3 characterize the size of input current iin3, i.e. input currents of the leakage current iblr plus drive circuit
Iin2, when it is high that it enables signal EN, then amplifier U82 is by controlling its output end VG so that RS3 voltages are equal to reference voltage
VREF81.First comparator U83 is compared reference signal VREF82 of the output of amplifier U82 and sign threshold current, obtains
To voltage V8H, whether voltage V8H can characterize the input current iin2 of drive circuit higher than threshold current.When iin2 is higher than threshold
During value electric current, then V8H is low；When iin2 is less than threshold current, then V8H is height.
With reference to shown in Fig. 5, the idiographic flow block diagram of embodiment one is illustrated.In the front half cycle of half-sinusoid, institute is first judged
Input voltage vrec is stated whether less than threshold voltage, i.e. whether input voltage vrec detection electric circuit inspections input voltage is less than setting
Value, when it is less than setting value, then its output ZVD is height, and otherwise ZVD is low.When ZVD is high, the output of logic circuit U12
EN is height, enables drive control circuit U 18, and the control leadage circuit of drive control circuit U 18 is enabled, and produces leakage current
iblr.The input current iin2 of the drive circuit is judged again whether more than respective threshold electric current, if so, then V8H=0, it is described
Leakage current adjusts circuit and does not enable, and EN is low.Judge whether the second half for entering half-sinusoid, if so, then determine 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 is adjusted
Economize on electricity road enables, if the input current of the drive circuit is higher than threshold value further below Low threshold, i.e. leakage current iblr, drives
Dynamic circuit input current close 0, so can now not need controllable silicon dimmer to turn on, then the leakage current adjusts circuit
Do not enable.
With reference to shown in Fig. 6, the work wave of embodiment one is illustrated.When controllable silicon dimmer is turned off, input current iin is
0, and VG is adjusted to ceiling voltage, the t31 moment in correspondence Fig. 6, because 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.At the t32 moment, can
Control silicon dimmer conduction, input voltage vin voltages are equal to AC-input voltage, when input current iin3 is less than setting value, then drive
The grid that dynamic control circuit U18 passes through control adjustment pipe M00 so that leakage current iblr is not less than plus input current iin2 and sets
Definite value, i.e. iin3 are not less than setting value, and the setting value is slightly above controllable silicon dimmer as threshold current, the threshold current
Maintain electric current.When input current iin3 higher than threshold value be V8H for it is low when, i.e. the input current iin2 of drive circuit is more than or equal to setting
During definite value, then the output EN of logic circuit is 0, that is, the output VG for controlling drive control circuit U 18 is low, leadage circuit is not made
Energy.So as to reduce the power consumption of leadage circuit.The big of leakage current can be judged by the V8 in detection drive control circuit U 18
Little, when leakage current is 0, V8 is 0；Can also be come by direct detection leadage circuit, characterizing the voltage RS2 of leakage current
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
(judged by V8H or judged by RS2), then the output EN of logic circuit is high, that is, control drive control circuit U 18
Switch K80 conductings, enable leadage circuit.In moment t34, AC-input voltage is reduced to 0, and input current is 0, that is, drive electricity
The input current iin2 on road is that 0, iin3 is equal to iblr, then the output EN of logic circuit is 0, and drive control circuit VG is 0,
Leadage circuit is not enabled.
With reference to shown in Fig. 7, the particular circuit configurations of the utility model leadage circuit embodiment two are illustrated.Embodiment two with
The difference of embodiment one is：In the second half of half-sinusoid, when the input current iin2 of drive circuit is less than threshold value electricity
During stream, leakage current adjusts circuit and does not enable, and logic circuit control drive circuit is not enabled or disconnected to drive circuit
Power supply, the present embodiment be drive circuit input add switch K10, make switch K10 turn off.The embodiment is root
According to the characteristics design of drive circuit, further reduce power consumption, improve system effectiveness.
With reference to shown in Fig. 8, the particular circuit configurations of the utility model leadage circuit embodiment three are illustrated.Embodiment three with
Embodiment two is similar, i.e., in the second half of half-sinusoid, when the input current iin2 of drive circuit is less than threshold current, release
Current regulating circuit is not enabled, and logic circuit control drive circuit is not enabled, and it is by patrolling that control drive circuit is not enabled
The signal EN2 whether circuit enables to another sign of drive circuit transmission is collected, in these cases, EN2 is height, then drive circuit
Do not enable.
With reference to shown in Fig. 9, the FB(flow block) of the utility model leadage circuit embodiment two, three is illustrated.With embodiment one
The difference of flow process (i.e. Fig. 5) be：In the front half cycle of half-sinusoid, when input voltage vrec is less than threshold voltage,
First make signal EN2 and turn on for high or switch K10, so that drive circuit is enabled；In the second half of half-sinusoid, the driving electricity
The input current iin2 on road is less than respective threshold electric current, then V8H=1, now, enables signal EN2 for low or switch K10 shut-offs.
With reference to shown in Figure 10, the work wave of the utility model leadage circuit embodiment two, three is illustrated.Its work wave
It is with the difference of the waveform of embodiment one：In embodiment one, at the t33 moment, as the input current iin2 of drive circuit
During less than predetermined value, leadage circuit is enabled；And in embodiment two, three, with the t33 of the embodiment one corresponding t43 moment, work as driving
When the input current iin2 of circuit is less than predetermined value, leadage circuit is not enabled, i.e., do not produce leakage current.
With reference to shown in Figure 11, illustrate the circuit structure of the utility model leadage circuit example IV, the present embodiment be
The improvement carried out in embodiment one, differs primarily in that drive circuit input electric cur- rent measure circuit.Described drive circuit is defeated
Enter current detection circuit and detect the input current of the drive circuit and realize in the following way：Sampling leakage current,
Obtain characterizing the sampled signal of leakage current, when the sampled signal of the leadage circuit reaches corresponding reference value, judge described
Drive circuit input current reach the Low threshold.I.e. the present embodiment is carried out by sampling leakage current indirectly with high threshold
Relatively, it is achieved thereby that the comparison of drive circuit input current and Low threshold.The positive input terminal connection high threshold ginseng of comparator U61
Signal VREF7 is examined, when leakage current iblr is higher than threshold value, then the output ZC of comparator U61 is height, then EN is low, controls institute
State leakage current regulation circuit not enable.In the present embodiment, described high threshold can be set to level off to maintenance electric current
Value, then, reference signal VREF7 also levels off to reference voltage V REF81 in drive control circuit U 18, because of leakage current iblr
During higher than threshold value, drive circuit input current close 0, so can now not need controllable silicon dimmer to turn on, so need not
Leadage circuit is enabled.
In addition, although above embodiment is separately illustrated and is illustrated, but it is related to the common technology in part, in this area
Those of ordinary skill apparently, can between the embodiments be replaced and integrate, and be related to one of embodiment and be not expressly recited
Content, then refer to another embodiment on the books.Simultaneously it should be noted that the error amplifier in the utility model
Can be realized using operational amplifier.
Embodiments described above, does not constitute the restriction to the technical scheme protection domain.It is any in above-mentioned enforcement
Modification, equivalent and improvement made within the spirit and principle of mode etc., should be included in the protection model of the technical scheme
Within enclosing.
Claims (10)
1. a kind of leadage circuit, it is characterised in that：Including：
Leakage current adjusts circuit, including adjustment is managed and adjusts current source or the/resistance that pipe is connected with described；Exchange input Jing can
Control silicon light modulator and rectifier bridge obtain input voltage Jing drive circuits to load supplying, and the leakage current adjusts the two ends of circuit
It is connected with the high cold end of input voltage respectively；
Release control circuit, be connected with the control end of the adjustment pipe；In the front half cycle of half-sinusoid, when the input voltage it is low
When threshold voltage, then leakage current is caused to adjust circuit generation leakage current, Zhi Daosuo by adjusting the control end 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 by adjusting the control for adjusting pipe
End processed causes leakage current to adjust circuit and produces 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：Described control circuit of releasing includes that enabling signal produces
Raw circuit and the drive control circuit for being connected to adjustment pipe control end, the enable signal generating circuit is by detecting input voltage
With the input current of drive circuit, produce and characterize the signal for whether enabling, whether the drive control circuit receives the sign
The signal of enable, and the state of control adjustment pipe accordingly.
3. leadage circuit according to claim 2, it is characterised in that：The enable signal generating circuit includes input voltage
Detection circuit, drive circuit input electric cur- rent measure circuit and logic circuit, described input voltage detection circuit judges input electricity
Whether pressure is less than threshold voltage, and result is exported to the logic circuit, described drive circuit input electric cur- rent measure circuit inspection
When the input current for measuring the drive circuit reaches the Low threshold, the logic circuit output characterizes the signal for enabling to institute
State drive control circuit.
4. leadage circuit according to claim 3, it is characterised in that：Described drive circuit input electric cur- rent measure circuit inspection
The input current for measuring the drive circuit is realized in the following way：Sampling leakage current, obtains characterizing leakage current
Sampled signal, when the sampled signal of the leadage circuit reaches corresponding reference value, judge described 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 is received and characterizes total input electricity
The current sampling signal of stream, and it is carried out into Error processing with current reference signal, to obtain driving voltage, adjust in leakage current
When economize on electricity road enables, described 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：Described driving voltage can be used to characterize drive circuit
Input current size, by the driving voltage with characterize threshold current reference voltage be compared, its comparative result is then
Whether the input current for characterizing the drive circuit reaches threshold current.
7. the leadage circuit according to claim 5 or 6, it is characterised in that：Described drive control circuit is put including error
Big device and first comparator, the first input end of described error amplifier receives the current sample for characterizing total input current
Signal, its second input receives the current reference signal, its output end outputting drive voltage, in the output of error amplifier
End Jing is switched and is connected with the control end of adjustment pipe, and the control end of the switch is received and characterizes the signal for whether enabling；Meanwhile, this
The first input end of one comparator receives the driving voltage, and its second input receives the reference electricity for characterizing threshold current
Pressure, the output end output of first comparator characterizes the input current of drive circuit and whether reaches the signal of threshold current, and to
Obtain the signal for whether enabling accordingly.
8. leadage circuit according to claim 3, it is characterised in that：Described drive circuit input electric cur- rent measure circuit bag
Add circuit and the second comparator are included, described add circuit receives respectively the current sampling signal and table for characterizing total input current
The current sampling signal of leakage current is levied, two for being received current sampling signal is in opposite direction, therefore the add circuit is exported
The signal of drive circuit input current is characterized, the first input end of second comparator receives the reference letter for characterizing Low threshold
Number, its second end receives the signal of the sign drive circuit input current, the output end of the second comparator and the logic circuit
Connection.
9. a kind of leadage circuit, it is characterised in that：Including：
Leakage current adjusts circuit, including adjustment is managed and adjusts current source or the/resistance that pipe is connected with described；Exchange input Jing can
Control silicon light modulator and rectifier bridge obtain input voltage Jing drive circuits to load supplying, and the leakage current adjusts the two ends of circuit
It is connected with the high cold end of input voltage respectively；
Release control circuit, be connected with the control end of the adjustment pipe；In the front half cycle of half-sinusoid, when the input voltage it is low
When threshold voltage, then leakage current is caused to adjust circuit generation leakage current, Zhi Daosuo by adjusting the control end 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 in drive circuit loop.
10. a kind of LED control circuit, it is characterised in that：Including：Any one leadage circuit of above claim 1-9 and LED drive
Dynamic circuit, described LED drive circuit is on-off circuit or linear drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621170606.0U CN206181442U (en) | 2016-10-26 | 2016-10-26 | Bleeder circuit and LED control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621170606.0U CN206181442U (en) | 2016-10-26 | 2016-10-26 | Bleeder circuit and LED control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206181442U true CN206181442U (en) | 2017-05-17 |
Family
ID=58679984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621170606.0U Withdrawn - After Issue CN206181442U (en) | 2016-10-26 | 2016-10-26 | Bleeder circuit and LED control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206181442U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106332374A (en) * | 2016-10-26 | 2017-01-11 | 杰华特微电子（杭州）有限公司 | Bleeder circuit and method for controlling bleeder current and LED control circuit |
| CN107864532A (en) * | 2017-11-03 | 2018-03-30 | 杰华特微电子（杭州）有限公司 | LED light adjusting circuits and method and LED control circuit |
| CN107995747A (en) * | 2017-12-28 | 2018-05-04 | 矽力杰半导体技术(杭州)有限公司 | Circuit module, Dimmable LED drive circuit and control method |
| CN110198580A (en) * | 2019-04-17 | 2019-09-03 | 美芯晟科技（北京）有限公司 | LED drive circuit, load control system, load system and control method |
| CN110381633A (en) * | 2019-07-05 | 2019-10-25 | 杰华特微电子（杭州）有限公司 | Power factor optimization circuit and the LED drive circuit for applying it |
| CN110535335A (en) * | 2018-05-25 | 2019-12-03 | 株洲中车时代电气股份有限公司 | It is a kind of for controlling the method and system of switching device in energy leadage circuit |
| CN111432534A (en) * | 2020-04-17 | 2020-07-17 | 杰华特微电子（杭州）有限公司 | Silicon controlled rectifier dimming driving circuit and control method thereof |
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2016
- 2016-10-26 CN CN201621170606.0U patent/CN206181442U/en not_active Withdrawn - After Issue
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106332374A (en) * | 2016-10-26 | 2017-01-11 | 杰华特微电子（杭州）有限公司 | Bleeder circuit and method for controlling bleeder current and LED control circuit |
| CN106332374B (en) * | 2016-10-26 | 2018-04-17 | 杰华特微电子（杭州）有限公司 | A kind of leadage circuit and leakage current control method and LED control circuit |
| CN107864532A (en) * | 2017-11-03 | 2018-03-30 | 杰华特微电子（杭州）有限公司 | LED light adjusting circuits and method and LED control circuit |
| CN107864532B (en) * | 2017-11-03 | 2023-09-26 | 杰华特微电子股份有限公司 | LED dimming circuit and method and LED control circuit |
| CN107995747A (en) * | 2017-12-28 | 2018-05-04 | 矽力杰半导体技术(杭州)有限公司 | Circuit module, Dimmable LED drive circuit and control method |
| CN110535335A (en) * | 2018-05-25 | 2019-12-03 | 株洲中车时代电气股份有限公司 | It is a kind of for controlling the method and system of switching device in energy leadage circuit |
| CN110535335B (en) * | 2018-05-25 | 2020-12-08 | 株洲中车时代电气股份有限公司 | Method and system for controlling switching device in energy discharge circuit |
| CN110198580A (en) * | 2019-04-17 | 2019-09-03 | 美芯晟科技（北京）有限公司 | LED drive circuit, load control system, load system and control method |
| CN110198580B (en) * | 2019-04-17 | 2021-04-27 | 美芯晟科技（北京）有限公司 | LED drive circuit, load control system, load system and control method |
| CN110381633A (en) * | 2019-07-05 | 2019-10-25 | 杰华特微电子（杭州）有限公司 | Power factor optimization circuit and the LED drive circuit for applying it |
| CN110381633B (en) * | 2019-07-05 | 2024-07-23 | 杰华特微电子股份有限公司 | Power factor optimization circuit and LED driving circuit applying same |
| CN111432534A (en) * | 2020-04-17 | 2020-07-17 | 杰华特微电子（杭州）有限公司 | Silicon controlled rectifier dimming driving circuit and control method thereof |
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