CN103517490B - Driver, luminaire and the method for controlling driver - Google Patents
Driver, luminaire and the method for controlling driver Download PDFInfo
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- CN103517490B CN103517490B CN201210201477.7A CN201210201477A CN103517490B CN 103517490 B CN103517490 B CN 103517490B CN 201210201477 A CN201210201477 A CN 201210201477A CN 103517490 B CN103517490 B CN 103517490B
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Abstract
Present disclose provides driver, luminaire and the control method due to driver.The driver is used to drive operation element by the power received from electronic transformer and including input stage, buffer stage, output stage and control unit.Input stage provides power to buffer stage and is switched so that the output voltage of buffer stage keeps substantially constant between the first mode of operation and the first shutdown mode.Buffer stage transmits power from input stage to output stage.Output stage provides power to operation element and switched between the second mode of operation and the second shutdown mode.Sampling of the control unit based on the voltage that input stage is supplied to electronic transformer or based on the first dutycycle and the second dutycycle, it is determined that be adjust the first dutycycle so that input stage be supplied to buffer stage mean power keep it is constant, or the second dutycycle of adjustment so that buffer stage is supplied to the mean power of output stage to change.The driver provided in accordance with an embodiment of the present disclosure has improved properties.
Description
Technical field
This disclosure relates to electron electric power technical field, in particular it relates to driver, luminaire and for controlling driving
The method of device.
Background technology
Recently, in such as lamp interface of MR16, AR111 specification, low-voltage luminescence diode is widely used（LED）Make
For light source to save the energy.In such luminaire, generally existing is used for main power source（Such as civil power）The electricity provided
Pressure is converted to the electronic transformer of low-voltage AC（ET）And light modulator and the electronic driver for driving light emitting diode
Between compatibility issue.
In the market, most of low-voltage luminescence diode artistic lamps when a part of existing electronic transformer is used together,
Can there are problems that.Moreover, many LED lamps can not be used together with light modulator, which has limited light-emitting diodes
The application of spot tool.
In WO2011033415, it is proposed that a kind of lighting apparatus and corresponding driving method, the lighting apparatus includes being used for
The driver of light emitting diode is driven by the power provided from electronic transformer.In this scenario, due to needing to driving
The output stage of device is supplied to the electric current of light emitting diode to be sampled, and consequently leads to a series of problems, for example, output stage needs
It is configured as high side drive circuit and then causes system complex and costliness.
The content of the invention
Accordingly, it is desirable to provide improved driver, and luminaire using the driver and to the driver
Control method.
In accordance with an embodiment of the present disclosure there is provided a kind of driver, it is used for the power by being received from electronic transformer
To drive operation element, the driver includes input stage, buffer stage, output stage and control unit.Input stage is configured as to slow
Rush level and power is provided, and switch over to cause the output electricity of buffer stage between the first mode of operation and the first shutdown mode
Pressure keep substantially constant, in the first mode of operation, electronic transformer with the minimum output current higher than electronic transformer come to
Input stage provides power, and in the first shutdown mode, electronic transformer does not provide power to input stage.Buffer stage is configured as
Power is provided from input stage receiving power, and to output stage.Output stage is configured as to operation element offer power, and
Switched between second mode of operation and the second shutdown mode, in the second mode of operation, buffer stage provides work(to output stage
Rate, and in the second shutdown mode, buffer stage does not provide power to output stage.Control unit is configured as：Based on becoming to electronics
Depressor is supplied to the sampling of the voltage of input stage, or based on the first dutycycle and the second dutycycle, it is determined that being that adjustment first is accounted for
Sky than cause input stage be supplied to buffer stage mean power keep it is constant, or adjust the second dutycycle buffer stage is provided
Mean power to output stage changes, wherein, the first dutycycle refers to that the time that input stage is in the first mode of operation accounts for
Input stage is in the first mode of operation and the ratio of the total time in the first shutdown mode, and the second dutycycle refers to output stage
Time in the second mode of operation accounts for the ratio for the total time that output stage is in the second mode of operation and the second shutdown mode
Example.
Preferably, in the driver, control unit can be further configured to：If the first dutycycle is less than first
Duty cycle threshold, then when the sampling of the output voltage to buffer stage reduces, improve the first dutycycle so that input stage is supplied to
The mean power of buffer stage keeps constant；If the first dutycycle is equal to the first duty cycle threshold, in the output to buffer stage
When the sampling of voltage reduces, the second dutycycle is reduced so that buffer stage is supplied to the mean power of output stage to reduce；If second
Dutycycle is less than the second duty cycle threshold, then in the sampling increase of the output voltage to buffer stage, improves the second dutycycle, make
Obtaining buffer stage is supplied to the mean power of output stage to increase；And if the second dutycycle is equal to the second duty cycle threshold, then exist
During to the sampling increase of the output voltage of buffer stage, the first dutycycle is reduced so that input stage is supplied to the average work(of buffer stage
Rate keeps constant.
Alternatively, in the driver, control unit can also be further configured to：Based on being carried to electronic transformer
The sampling of the voltage of input stage is supplied, determines that electronic transformer is supplied to the angle of flow of the voltage of input stage；If the angle of flow is big
In equal to predetermined threshold, then the first dutycycle is adjusted so that input stage is supplied to the mean power of buffer stage to keep constant；And
If the angle of flow is less than predetermined threshold, the second dutycycle is adjusted so that buffer stage is supplied to the mean power of output stage to change.
Preferably, in the driver, input stage can include being used for the AC DC from electronic transformer receiving power
Converting unit and the DC conversion unit for providing power to buffer stage, and are supplied to input stage to electronic transformer
The sampling of voltage can be obtained by being supplied to the voltage of DC conversion unit to be sampled to AC DC converting unit.
Preferably, in the driver, output stage can be configured as low side drive circuit.
According to another embodiment of the present disclosure, a kind of luminaire is additionally provided, it includes above-mentioned driver and by upper
State at least one light emitting diode that driver is driven.
According to the another embodiment of the disclosure, it is further provided a kind of method for controlling driver, the driver
For driving operation element by the power received from electronic transformer, and including input stage, buffer stage, output stage.It is defeated
Enter level to be configured as providing power to buffer stage, and switch between the first mode of operation and the first shutdown mode so that
The output voltage for obtaining buffer stage keeps substantially constant, and in the first mode of operation, electronic transformer is with higher than electronic transformer
Minimum output current to provide power to input stage, and in the first shutdown mode, electronic transformer does not provide work(to input stage
Rate.Buffer stage is configured as from input stage receiving power, and provides power to output stage.Output stage is configured as to work member
Part provides power, and is switched between the second mode of operation and the second shutdown mode, in the second mode of operation, buffering
Level provides power to output stage, and in the second shutdown mode, buffer stage does not provide power to output stage.This method includes：Base
In the sampling for the voltage that input stage is supplied to electronic transformer, or based on the first dutycycle and the second dutycycle, it is determined that being
The first dutycycle is adjusted so that input stage is supplied to the mean power of buffer stage to keep constant, or the second dutycycle of adjustment causes
Buffer stage is supplied to the mean power of output stage to change, wherein, the first dutycycle refers to that input stage is in the first mode of operation
In time account for input stage and be in the first mode of operation and the ratio of the total time in the first shutdown mode, and the second dutycycle refers to
Be output stage be in the second mode of operation in time account for output stage be in the second mode of operation and the second shutdown mode in
The ratio of total time.
In the driver provided in accordance with an embodiment of the present disclosure, it is not necessary to which the electric current for being supplied to operation element is carried out
Sampling, thus simplify the structure of driver and reduce cost.Meanwhile, such driver both can be with electronic transformer
It is mutually compatible, light modulation can be realized again.
Brief description of the drawings
From the point of view of the following description of purport and its preferred embodiments and drawings used to illustrating the disclosure, the disclosure
Above and other objects, features and advantages will be apparent, in the accompanying drawings：
Fig. 1 is the block diagram for showing the system for applying driver in accordance with an embodiment of the present disclosure；
Fig. 2 is the circuit diagram for showing driver in accordance with an embodiment of the present disclosure；And
Fig. 3 shown in the control to driver in accordance with an embodiment of the present disclosure, the relation of several main signals.
Embodiment
In accordance with an embodiment of the present disclosure there is provided a kind of driver, it is used for the power by being received from electronic transformer
To drive operation element, the driver includes input stage, buffer stage, output stage and control unit.Input stage is configured as to slow
Rush level and power is provided, and switch over to cause the output electricity of buffer stage between the first mode of operation and the first shutdown mode
Pressure keep substantially constant, in the first mode of operation, electronic transformer with the minimum output current higher than electronic transformer come to
Input stage provides power, and in the first shutdown mode, electronic transformer does not provide power to input stage.Buffer stage is configured as
Power is provided from input stage receiving power, and to output stage.Output stage is configured as to operation element offer power, and
Switched between second mode of operation and the second shutdown mode, in the second mode of operation, buffer stage provides work(to output stage
Rate, and in the second shutdown mode, buffer stage does not provide power to output stage.Control unit is configured as：Based on becoming to electronics
Depressor is supplied to the sampling of the voltage of input stage, or based on the first dutycycle and the second dutycycle, it is determined that being that adjustment first is accounted for
Sky than cause input stage be supplied to buffer stage mean power keep it is constant, or adjust the second dutycycle buffer stage is provided
Mean power to output stage changes, wherein, the first dutycycle refers to that the time that input stage is in the first mode of operation accounts for
Input stage is in the first mode of operation and the ratio of the total time in the first shutdown mode, and the second dutycycle refers to output stage
Time in the second mode of operation accounts for the ratio for the total time that output stage is in the second mode of operation and the second shutdown mode
Example.
In accordance with an embodiment of the present disclosure, a kind of luminaire is additionally provided, it includes above-mentioned driver and by above-mentioned drive
At least one light emitting diode that dynamic device is driven.
In accordance with an embodiment of the present disclosure, a kind of method for controlling driver is further disclosed, the driver is used for
Operation element is driven by the power received from electronic transformer, and including input stage, buffer stage, output stage.Input stage
It is configured as providing power to buffer stage, and is switched between the first mode of operation and the first shutdown mode with so that delaying
The output voltage for rushing level keeps substantially constant, and in the first mode of operation, electronic transformer is with the minimum higher than electronic transformer
Output current to provide power to input stage, and in the first shutdown mode, electronic transformer does not provide power to input stage.It is slow
Rush level to be configured as from input stage receiving power, and power is provided to output stage.Output stage is configured as carrying to operation element
Switched over for power, and between the second mode of operation and the second shutdown mode, in the second mode of operation, buffer stage to
Output stage provides power, and in the second shutdown mode, buffer stage does not provide power to output stage.This method includes：Based on pair
Electronic transformer is supplied to the sampling of the voltage of input stage, or based on the first dutycycle and the second dutycycle, it is determined that being adjustment
First dutycycle causes input stage to be supplied to the mean power of buffer stage to keep constant, or the second dutycycle of adjustment causes buffering
Level is supplied to the mean power of output stage to change, wherein, the first dutycycle refers to that input stage is in the first mode of operation
Time accounts for input stage and is in the first mode of operation and the ratio of the total time in the first shutdown mode, and the second dutycycle is referred to
Output stage be in the second mode of operation in time account for output stage be in the second mode of operation and the second shutdown mode in it is total when
Between ratio.
Fig. 1 is the block diagram for showing the system for applying driver 100 in accordance with an embodiment of the present disclosure.
Main power source 101 there is provided the power supply of such as 220V, 50Hz alternating current.Those of ordinary skill in the art should manage
Solution, main power source 101 can also be the AC power of other appropriate formats.
Adjust and obtained from main power source 101 the need for the need for light modulator 102 is used for according to user or according to automatically controlling
To power and provide it to electronic transformer 103.Wherein, light modulator 102 be in the way of limiting the angle of flow adjust from
The power that main power source 101 is obtained, its concrete mode is known to ordinary skill in the art, is no longer retouched in detail here
State.
Electronic transformer 103 is converted to the alternating current received such as 12V, 100Hz low-voltage AC.This area is general
Lead to it is to be understood by the skilled artisans that electronic transformer 103 can also be converted to the alternating current received the friendship of other appropriate formats
Stream electricity.The detail of electronic transformer is known to ordinary skill in the art, is not detailed herein.
It should be noted that it will be understood by those skilled in the art that in the case where light modulation processing need not be carried out,
Light modulator 102 can not be provided, but main power source 101 is directly connected to electronic transformer 103.In addition, the common skill in this area
Art personnel, which should also be understood that, can also be supplied to the low-voltage AC after electronic transformer 103 is changed appropriate light modulation
Device 102, that is, the position of light modulator 102 and electronic transformer 103 can be exchanged with each other in appropriate circumstances in Fig. 1.
Driver 100 obtains low-voltage AC from electronic transformer 103, and provides direct current use to operation element 108
In driving operation element 108.
Operation element 108 is for example single light emitting diode, the light emitting diode or light emitting diode matrix of series connection.This
Outside, it will be understood by those skilled in the art that operation element 108 can be than leds, with similar electricity
The element of gas characteristic.
When operation element 108 be at least one light emitting diode or other there is the light-emitting component of similar electrical characteristic
When, driver 100 and operation element 108 together constitute the example of luminaire in accordance with an embodiment of the present disclosure.
Driver 100 includes input stage 104, buffer stage 105, output stage 106 and control unit 107.
Input stage 104 is configured as providing power to buffer stage 105, and in the first mode of operation and the first shutdown mode
Between switch over, with cause buffer stage 105 output voltage keep substantially constant.In the first mode of operation, electronic transformer
Device 103 comes to provide power to input stage 104 with the minimum output current higher than electronic transformer 103, and in the first shutdown mode
In, electronic transformer 103 does not provide power to input stage 104.Buffer stage 105 is configured as from the receiving power of input stage 104, and
And provide power to output stage 106.
Because the minimum output current of electronic transformer 103 is typically larger than the operation element 108 of such as light emitting diode
Operating current, therefore, is configured so that electronic transformer 103 is exported during the first mode of operation to input stage 104 more than
The electric current of power be higher than the minimum output current of electronic transformer 103, and not to input stage 104 during the first shutdown mode
Power output.By doing that, it is ensured that the normal work of electronic transformer 103.Meanwhile, electronic transformer 103 is supplied to defeated
The mean power for entering level 104 can correspond to the average current lower than the minimum output current of electronic transformer 103, and with
The operating power of operation element 108 matches.
It will be understood by those skilled in the art that input stage 104 is between the first mode of operation and the first shutdown mode
Switching can carry out in a variety of ways, for example, the first mode of operation and the first shutdown mode can be periodically switched, its
In each cycle include ating least one period in the first mode of operation and at least one is in period of the first shutdown mode.
In addition it is also possible to aperiodically switch the first mode of operation and the first shutdown mode, but for example according to electronic transformer 103
The voltage provided come determine input stage 104 be in the first mode of operation or the first shutdown mode.Input stage 104 is in the first work
The details switched between operation mode and the first shutdown mode is known to ordinary skill in the art, for example, may be referred to
WO2011033415, will not be described in detail herein.
Buffer stage 105 can be configured with the capacitor of suitable parameter, and the details of buffer stage 105 is this area
Well known to those of ordinary skill, for example, WO2011033415 is may be referred to, will not be described in detail herein.
Therefore, the output voltage of buffer stage 105 corresponds to energy stored in buffer stage 105.When buffer stage 105 is exported
Voltage rise when, the power that buffer stage 105 is received from input stage 104 is more than the power for being supplied to output stage 106；And when buffering
During the voltage reduction of the output of level 105, the power that buffer stage 105 is received from input stage 104 is less than the work(for being supplied to output stage 106
Rate.
Therefore, switching of the input stage 104 between the first mode of operation and the first shutdown mode is configured such that buffering
The power received of level 105 and the power exported keep being equal to each other substantially.
Due to buffer stage 105 sometimes in charged state sometimes in discharge condition, so " buffering mentioned herein
The output voltage of level 105 keeps substantially constant " it is signified be not buffer stage 105 instantaneous output voltage be always to maintain it is constant,
But allow there is " disturbance " in the instantaneous output voltage of buffer stage 105, as long as example, the output voltage of buffer stage 105 exists
Average voltage in unit period is constant.
, can be by adjusting input stage when there is " disturbance " in the power that electronic transformer 103 is supplied to input stage 104
104 be in the first mode of operation in times account for input stage 104 be in the first mode of operation and the first shutdown mode in it is total when
Between ratio（Hereinafter referred to as " the first dutycycle "）, to cause the output voltage of buffer stage 105 to keep substantially constant.
Specifically, it can for example be constituted by being supplied to the electric current of buffer stage 105 to be sampled to input stage 104 anti-
Road is fed back to, so that by appropriate control program, such as various appropriate Linear Controls and nonlinear Control scheme are defeated to adjust
Enter time of the level 104 during the first mode of operation account for the ratio of total time with cause buffer stage 105 output voltage keep base
This is constant.It should be noted that those of ordinary skill in the art can also constitute backfeed loop in another appropriate manner.
It should be noted that control performed here is to be supplied to for electronic transformer 103 in the power of input stage 104
" disturbance " carry out.So-called " disturbance " refers to that electronic transformer 103 is supplied to input stage 104 during the first mode of operation
Mean power do not change.Corresponding, what electronic transformer 103 was provided during the first mode of operation is averaged
The angle of flow that the situation that power is changed, such as electronic transformer 103 are supplied to the voltage of input stage 104 and had occurs
The situation changed, is properly termed as electronic transformer 103 and is supplied in the power of input stage 104 there is " skew " here.
In the case of there is " disturbance " in the power that electronic transformer 103 is supplied to input stage 104, due to electronic transformer
Device 103 is supplied to the mean power of input stage 104 not change during first operator scheme, if being used as input stage
The working condition of the buffer stage 105 of 104 load, output stage 106 and operation element 108 does not also change, then input stage
104 are supplied to the mean power of buffer stage 105 also not change.Thus, the first dutycycle will not also change.
Output stage 106 is configured as providing power to operation element 108, and is configured as in the second mode of operation and the
Switched between two shutdown modes.In the second mode of operation, buffer stage 105 provides power to output stage 106, and second
In shutdown mode, buffer stage 105 does not provide power to output stage 106.
In the case of it there is " skew " in the power that electronic transformer 103 is supplied to input stage 104, for example, become in electronics
In the case that the angle of flow that depressor 103 is supplied to the voltage of input stage 104 and had there occurs change, if the degree of " skew "
It is smaller, then mean " skew " be possible to not in accordance with user the need for or according to automatically controlling the need for carry out,
But caused by other factors.Therefore, scheme advantageously is to maintain driver 100 and is used to drive operation element 108
Power is constant, rather than the power for following " skew " to drive operation element 108 to change driver 100 to be used for.
Therefore, in this case, control unit 107 adjusts the first dutycycle so that input stage 104 is supplied to buffer stage
105 mean power keeps constant.Because while the first dutycycle is have adjusted, but input stage 104 is still configured as
Switch over to cause the output voltage of buffer stage 105 to keep substantially constant, institute between one mode of operation and the first shutdown mode
Being supplied to the mean power of buffer stage 105 to keep constant with input stage 104 means that buffer stage 105 is supplied to output stage 106
Mean power also keeps constant.And then, because the operation carried out does not change the electricity of output stage 106 and operation element 108 herein
Gas characteristic, therefore driver 100 is for driving the power of operation element 108 constant.
If the degree of " skew " is larger, mean " skew " be likely to be according to user the need for or according to from
Carried out the need for dynamic control.Therefore, scheme advantageously is to be used to drive with changing driver 100 according to " skew " is somebody's turn to do
The power of operation element 108.
Therefore, in this case, the time that the adjustment of control unit 107 output stage 106 is in the second mode of operation accounts for defeated
Go out level 106 and be in the second mode of operation and the ratio of the total time in the second shutdown mode（Hereinafter referred to as " the second dutycycle "）,
To change the mean power that buffer stage 105 is supplied to output stage 106.
Now, although electronic transformer 103 provides the ability of power due to " skew " as power source to input stage 104
Die down, but be due to that the second dutycycle also correspondingly diminishes, be the light-emitting component of such as light emitting diode in operation element 108
In the case of, operation element 108 is correspondingly lighted with relatively low brightness.
Control unit 107 can the sampling based on the voltage that input stage 104 is supplied to electronic transformer 103, to determine
Electronic transformer 103 is supplied to the angle of flow that the voltage of input stage 104 has, and then determines that electronic transformer 103 is supplied to
" skew " degree of the voltage of input stage 104.The angle of flow and predetermined threshold can also be compared to judge by control unit 107
Carried out the need for the need for " skew " is somebody's turn to do whether according to user or according to automatically controlling, so that it is determined that should take
Processing.
It therefore, it can limit the conducting for the voltage that electronic transformer 103 is supplied to input stage 104 by light modulator 102
Angle, to be dimmed to the operation element 108 as light-emitting component.
In addition, the driver 100 being configured so that can mutually compatibly driving work be first with various existing electronic transformers
Part 108.
Moreover, because the electric current of operation element 108 need not be supplied to sample output stage 106, output stage
106 can be configured as low side drive circuit.In other words, can be by for switching the second mode of operation and the second shutdown mode
Switch is placed between operation element 108 and ground connection, rather than operation element 108 is placed between the switch and ground connection.
Because low side drive circuit is substantially better than high side drive circuit in cost, and due to that need not provide to output
Level 106 is supplied to the circuit that the electric current of operation element 108 is sampled, therefore driver 100 is compared to the driving of prior art
Device, structure is simpler, and cost is lower.
The foregoing describe the structure of driver 100 in accordance with an embodiment of the present disclosure.Briefly described below in conjunction with Fig. 2
The examples of circuits of driver 100.
Fig. 2 is the circuit diagram for showing driver 100 in accordance with an embodiment of the present disclosure.
As shown in Fig. 2 the voltage for being supplied to electronic transformer 103 from light modulator 102 is referred to as ET_in.
As an example, input stage 104 includes AC DC converting unit 141 and DC conversion unit 142.This area is common
It is to be understood by the skilled artisans that input stage 104 can also be configured otherwise.
AC DC converting unit 141, and can be for example including electromagnetic interference from the receiving power of electronic transformer 103
（EMI）Wave filter and bridge rectifier etc., naturally it is also possible to additionally or alternatively include other units.
DC conversion unit 142 is used to provide power to buffer stage 105, and can include being used for through AC DC turning
Change resistor R1, R2 and capacitor C1 that unit 141 is supplied to the voltage of DC conversion unit 142 to be sampled.Here, resistance
Device R1, R2 and capacitor C1 are configured such that sampled voltage Vac is suitable to be provided to as micro-control unit（MCU）'s
Control unit 107.Adopted by the voltage for obtaining voltage Vac and obtained being supplied to electronic transformer 103 input stage 104
Sample.If limited the angle of flow that the voltage ET_in of electronic transformer 103 is supplied to from light modulator 102, it can lead to
Cross and Vac is carried out proper treatment to obtain the angle of flow.Specific processing mode is public for those of ordinary skills
Know, will not be described in detail herein.
It should be noted that resistor R1, R2 and capacitor C1 can also be not adapted to one of DC conversion unit 142
Point.
DC conversion unit 142 also includes as the inductor L1 of energy-accumulating element and slow for being supplied to input stage 104
Rush the resistor R5 that the electric current of level 105 is sampled.Sampled electric current with it is being provided by control unit 107, corresponding to
After the reference voltage V ref of one dutycycle is compared, by a pulse width modulation module come control input level 104 in the first work
Switching between operation mode and the first shutdown mode, to cause the output voltage of buffer stage 105 to keep substantially constant.
The detailed configuration of input stage 104 is known for those of ordinary skills, therefore no longer detailed herein
State.In addition, those of ordinary skill in the art should also be understood that can also configure input stage 104 using other appropriate ways.
Buffer stage 105 includes diode D1, the capacitor C3, Yi Jiyong as energy-accumulating element for rated current direction
Resistor R3, the R4 and capacitor C2 sampled in the output voltage to buffer stage 105.Here, resistor R3, R4 and electric capacity
Device C2 is configured such that sampled voltage Vbuffer is suitable to be provided to the control unit 107 as micro-control unit.
It should be noted that resistor R3, R4 and capacitor C2 can also be not adapted to a part for buffer stage 105.
Output stage 106 includes the inductor L2 as the energy-accumulating element and diode D2 for rated current direction.It is defeated
Going out level 106 also includes modulator 162 and for the drop for the pulse-width signal PWM that such as 100kHz is provided to modulator 162
Pressure（Buck）Controller 161.Modulator 162 also receives such as 1kHz, tune corresponding to the second dutycycle from control unit 107
Optical signal DIM.Modulator 162 modulates received pulse-width signal PWM by dim signal DIM to control output stage
106 switching between the second mode of operation and the second shutdown mode, the flat of output stage 106 is supplied to adjust buffer stage 105
Equal power.
It should be noted that in output stage 106, the switch for switching the second mode of operation and the second shutdown mode is located at
Between operation element 108 and ground connection, that is, output stage 106 is configured as low side drive circuit.
Control unit 107 is configured as micro-control unit, it will be understood by those skilled in the art that control unit
107 can also have other implementations, for example, realized by hardware, software, firmware or its combination.
Control unit 107 receives the sampling Vac for the voltage that input stage 104 is supplied to electronic transformer 103 and to buffering
The sampling Vbuffer of the output voltage of level 105, and suitably changed and handled, to determine reference voltage V ref
And dim signal DIM.
Specifically, for example based on sampled voltage Vac and Vbuffer or sampled voltage Vbuffer can be based only upon come really
Determine reference voltage V ref, and dim signal DIM can be determined based on sampled voltage Vbuffer and reference voltage V ref.In detail
See the description carried out later in reference to Fig. 3.
It will be appreciated by one of ordinary skill in the art that reference voltage V ref can be determined using any appropriate method
And dim signal DIM.
Operation element 108 is the light emitting diode of one group of series connection, however, it will be understood by those skilled in the art that work
Make element 108 can also be other have diode electrical characteristic element.
Although not having a detailed description the details of each functional part involved in Fig. 2 above, this area is common
Technical staff can obtain the details of each functional part, such as design parameter configuration and operation principle according to the disclosure, and
And can replace what is specifically illustrated in Fig. 2 as example with appropriate functional part according to this area conventional technical means
Functional part.
Hereinafter, the relation between several main signals with reference to described in Fig. 3, to describe to the implementation according to the disclosure
The control that the driver 100 of example is carried out.
In t1 the and t9 stages, the ET_in angles of flow are 180 degrees, i.e. the angle of flow is not restricted.Reference voltage V ref is in most
Low position, it is meant that the first dutycycle is minimum.Shown in Fig. 2, output stage 106 is supplied to the electric current of operation element 108
Iout average value Iout_mean is peak max2.The second dutycycle wherein corresponding to peak max2 is accounted for equal to second
Sky compares threshold value.
In the t2 stages, control unit 107 can sense the ET_in angle of flow more than predetermined based on sampled voltage Vac
Threshold value, and reduce, wherein, the variation tendency of the angle of flow can also be sensed based on sampled voltage Vbuffer.This
When, control unit 107 causes reference voltage V ref rises, so as to improve the first dutycycle.Due to the raising quilt of the first dutycycle
Control to offset caused by electronic transformer 103 is supplied to the mean power of input stage 104 due to the reduction of the angle of flow
Reduction, therefore input stage 104 is supplied to the mean power of buffer stage 105 to keep constant.Meanwhile, control unit 107 causes light modulation
Signal DIM keeps constant, so that the second dutycycle keeps constant, and buffer stage 105 is not supplied to the mean power of output stage 106 also not
Change.So in this stage, the current average Iout_mean for flowing through operation element 108 remains peak max2, work
The real work power of element 108 does not change.
In t3 the and t7 stages, the ET_in angle of flow is equal to predetermined threshold.Now, current average Iout_mean is highest
Value max2, and reference voltage V ref is peak max1.Wherein, the first dutycycle corresponding to peak max1 is equal to
One duty cycle threshold.
In the t4 stages, control unit 107 can sense the ET_in angle of flow less than predetermined based on sampled voltage Vac
Threshold value and reduce, wherein, the variation tendency of the angle of flow can also be sensed based on sampled voltage Vbuffer.Now,
Control unit 107 causes reference voltage V ref to be maintained at peak max1.Meanwhile, control unit 107 causes dim signal DIM to subtract
It is small, so as to reduce the second dutycycle so that buffer stage 105 is supplied to the mean power of output stage 106 to reduce.So in the stage
In, the current average Iout_mean for flowing through operation element 108 reduces, and the real work power of operation element 108 also reduces.
In the t5 stages, the ET_in angle of flow is minimum value.Now, reference voltage V ref remains peak max1, and
Current average Iout_mean is minimum, it means that the second dutycycle is minimum value.
In the t6 stages, control unit 107 can sense the ET_in angle of flow less than predetermined based on sampled voltage Vac
Threshold value and increase, wherein, the variation tendency of the angle of flow can also be sensed based on sampled voltage Vbuffer.Now,
Control unit 107 causes reference voltage V ref to be maintained at peak max1.Meanwhile, control unit 107 causes dim signal DIM to increase
Plus, so as to improve the second dutycycle so that buffer stage 105 is supplied to the mean power of output stage 106 to increase.So in the stage
In, the current average Iout_mean rises of operation element 108 are flowed through, the real work power of operation element 108 is also raised.
In the t8 stages, control unit 107 can sense the ET_in angle of flow more than predetermined based on sampled voltage Vac
Threshold value and increase, wherein, the variation tendency of the angle of flow can also be sensed based on sampled voltage Vbuffer.Now,
Control unit 107 causes reference voltage V ref reductions, so as to reduce the first dutycycle.Reduction due to the first dutycycle is controlled
The power of input stage 104 is supplied to due to increasing caused by the increase of the angle of flow for electronic transformer 103 can be offset, therefore
Input stage 104 is supplied to the mean power of buffer stage 105 to keep constant.Meanwhile, control unit 107 causes dim signal DIM to protect
Hold constant, so that the second dutycycle keeps constant, buffer stage 105 is supplied to the mean power of output stage 106 also not change.So
In this stage, the current average Iout_mean for flowing through operation element 108 remains peak max2, operation element 108
Real work power does not change.
It should be noted that in t1 to t9 each stage, although sampled voltage Vbuffer has fluctuation, being to maintain
Substantially constant.
Therefore, by means of above control method, can be limited by light modulator 102 electronic transformer 103 be supplied to it is defeated
Enter the angle of flow of the voltage of level 104, to be dimmed to the operation element 108 as light-emitting component.
In addition, such control method can be such that driver 100 is mutually compatibly driven with various existing electronic transformers
Operation element 108.
Moreover, because the electric current of operation element 108 need not be supplied to sample output stage 106, output stage
106 can be configured as low side drive circuit.Because low side drive circuit is substantially better than high side drive circuit in cost, and
Controlled due to the circuit for being supplied to the electric current of operation element 108 to be sampled output stage 106 need not be provided, therefore more than use
Driver of the driver 100 compared to prior art of method processed, structure is simpler, and cost is lower.
In the embodiment above, the angle of flow is determined by sampled voltage Vac, so that it is determined that electronic transformer 103 is provided
What stage power to input stage 104 is in, it should correspondingly carry out which type of processing.
It should be noted that in the example that reference picture 3 is described, when the angle of flow is at predetermined threshold, i.e., in t3 the and t7 stages
When, reference voltage V ref is peak max1, in other words, and the first dutycycle is the first duty cycle threshold, while current average
Iout_mean is max2, i.e. dim signal DIM corresponds to its maximum, in other words, and the second dutycycle is the second dutycycle threshold
Value.
Accordingly it is also possible to determine that electronic transformer 103 is supplied to input stage based on the first dutycycle and the second dutycycle
What stage 104 power is in, it should correspondingly carry out which type of processing.It therefore, it can without using sampled voltage Vac.
Therefore, according in another embodiment of the present disclosure, driver without using sampled voltage Vac, it is convenient to omit for obtaining
Sampled voltage Vac resistor R1, R2 and capacitor C1.
Hereinafter, referring again to Fig. 3, the control carried out in the case of without using sampled voltage Vac to driver is described.
In stage t2, control unit 107 can sense buffer stage 105 based on sampled voltage Vbuffer reduction
Output voltage reduce.Now, control unit 107 can also determine that reference voltage V ref is less than peak max1, change speech
It, the first dutycycle is less than the first duty cycle threshold.Therefore, control unit 107 improves reference voltage V ref, in other words, improves
First dutycycle so that input stage 104 is supplied to the mean power of buffer stage 105 to keep constant.Meanwhile, control unit 107 makes
Obtain dim signal DIM and keep constant, so that the second dutycycle keeps constant, buffer stage 105 is supplied to the average work(of output stage 106
Rate does not also change.So in this stage, the current average Iout_mean for flowing through operation element 108 remains peak
Max2, the real work power of operation element 108 does not change.
In stage t4, control unit 107 can sense buffer stage 105 based on sampled voltage Vbuffer reduction
Output voltage reduce, now, control unit 107 can also determine reference voltage V ref be equal to peak max1, change speech
It, the first dutycycle is equal to the first duty cycle threshold.Therefore, control unit 107 keeps reference voltage V ref constant, in other words,
Keep the first dutycycle constant.Meanwhile, the reduction dim signal DIM of control unit 107, so as to reduce the second dutycycle so that slow
Rushing level 105 is supplied to the mean power of output stage 106 to reduce.So in this stage, the electric current for flowing through operation element 108 is averaged
Value Iout_mean reduces, and the real work power of operation element 108 also reduces.
In stage t6, control unit 107 can sense buffer stage 105 based on sampled voltage Vbuffer rise
Output voltage raise, now, control unit 107 can also be less than its maximum by dim signal DIM and determine electricity
Levelling average Iout_mean is less than peak max2, in other words, and the second dutycycle is less than the second duty cycle threshold.Therefore, control
Unit 107 keeps reference voltage V ref constant, in other words, keeps the first dutycycle constant.Meanwhile, control unit 107, which is improved, to be adjusted
Optical signal DIM, so as to improve the second dutycycle so that buffer stage 105 is supplied to the mean power of output stage 106 to increase.So
In this stage, the current average Iout_mean increases of operation element 108, the real work power of operation element 108 are flowed through
Also increase.
In stage t8, control unit 107 can sense buffer stage 105 based on sampled voltage Vbuffer rise
Output voltage raise, now, control unit 107 can also be equal to its maximum by dim signal DIM and determine electricity
Levelling average Iout_mean is equal to peak max2, in other words, and the second dutycycle is equal to the second duty cycle threshold.Therefore, control
Unit 107 causes reference voltage V ref reductions, in other words, reduce the first dutycycle so that input stage 104 is supplied to buffer stage
105 mean power keeps constant.Meanwhile, control unit 107 causes dim signal DIM to keep constant, so that the second dutycycle
Keep constant, buffer stage 105 is supplied to the mean power of output stage 106 also not change.So in this stage, flowing through work member
The current average Iout_mean of part 108 remains peak max2, and the real work power of operation element 108 does not occur
Change.
Therefore, by means of above control method, it again may be by light modulator 102 and come to the work member as light-emitting component
Part 108 is dimmed.
In addition, such control method can also make the driver and various existing electronics without using sampled voltage Vac
Transformer mutually compatibly drives operation element 108.
Moreover, because the electric current of operation element 108 need not be supplied to sample output stage 106, output stage
106 can be configured as low side drive circuit.Because low side drive circuit is substantially better than high side drive circuit in cost, and
Controlled due to the circuit for being supplied to the electric current of operation element 108 to be sampled output stage 106 need not be provided, therefore more than use
Driver of the driver 100 compared to prior art of method processed, structure is simpler, and cost is lower.
There is provided the control method of driver in accordance with an embodiment of the present disclosure, luminaire and driver above
Example.
Although embodiment of the disclosure is described in detail with reference to accompanying drawing above, those of ordinary skill in the art should manage
Solution, embodiments described above is only intended to illustrate the disclosure, and does not constitute limitation of this disclosure.This area is common
Technical staff, which is also understood that, is not departing from the situation for the spirit and scope of the present disclosure being defined by the claims appended hereto
Under, various changes can be carried out, substitutes and converts.Therefore, the scope of the present disclosure only contains by appended claim and its equally
Justice is limited.
Claims (7)
1. a kind of driver, it is used to drive operation element by the power received from electronic transformer, the driver bag
Input stage, buffer stage, output stage and control unit are included, wherein：
The input stage is configured as providing power to the buffer stage, and the first mode of operation and the first shutdown mode it
Between switch over to cause the output voltage of the buffer stage to keep constant, in first mode of operation, the electronics becomes
Depressor comes to provide power to the input stage with the minimum output current higher than the electronic transformer, and in the described first shut-off
In pattern, the electronic transformer does not provide power to the input stage；
The buffer stage is configured as from the input stage receiving power, and provides power to the output stage；
The output stage is configured as providing power to the operation element, and in the second mode of operation and the second shutdown mode
Between switch over, in second mode of operation, the buffer stage provides power to the output stage, and described second
In shutdown mode, the buffer stage does not provide power to the output stage；And
Described control unit is configured as the sampling based on the voltage that the input stage is supplied to the electronic transformer, or
Based on the first dutycycle and the second dutycycle, it is determined that be adjust first dutycycle so that the input stage be supplied to it is described slow
The mean power for rushing level keeps constant, or adjusting second dutycycle causes the buffer stage to be supplied to the output stage
Mean power changes, wherein, first dutycycle refers to the time that the input stage is in first mode of operation
Account for the input stage and be in first mode of operation and the ratio of the total time in first shutdown mode, and described second
Dutycycle refers to that the time that the output stage is in second mode of operation accounts for the output stage and is in second work
Operation mode and the ratio of the total time in second shutdown mode.
2. driver according to claim 1, wherein：
Described control unit is further configured to：
If first dutycycle is less than the first duty cycle threshold, reduce in the sampling of the output voltage to the buffer stage
When, improve first dutycycle so that the input stage is supplied to the mean power of the buffer stage to keep constant；
If first dutycycle is equal to first duty cycle threshold, in the sampling of the output voltage to the buffer stage
During reduction, second dutycycle is reduced so that the buffer stage is supplied to the mean power of the output stage to reduce；
If second dutycycle is less than the second duty cycle threshold, increase in the sampling of the output voltage to the buffer stage
When, improve second dutycycle so that the buffer stage is supplied to the mean power of the output stage to increase；And
If second dutycycle is equal to second duty cycle threshold, in the sampling of the output voltage to the buffer stage
During increase, first dutycycle is reduced so that the input stage is supplied to the mean power of the buffer stage to keep constant.
3. driver according to claim 1, wherein：
Described control unit is further configured to：
Based on the sampling for the voltage that the input stage is supplied to the electronic transformer, determine that the electronic transformer is supplied to
The angle of flow of the voltage of the input stage；
If the angle of flow is more than or equal to predetermined threshold, first dutycycle is adjusted so that the input stage is supplied to
The mean power of the buffer stage keeps constant；And
If the angle of flow is less than the predetermined threshold, second dutycycle is adjusted so that the buffer stage is supplied to
The mean power of the output stage correspondingly changes according to the change of the angle of flow.
4. driver according to claim 3, wherein：
The input stage is included being used for from the AC DC converting unit of the electronic transformer receiving power and for institute
The DC conversion unit that buffer stage provides power is stated, and
The sampling that the voltage of the input stage is supplied to the electronic transformer is by the AC DC converting unit
It is supplied to the voltage of the DC conversion unit to be sampled to obtain.
5. driver according to any one of claim 1 to 4, wherein：
The output stage is configured as low side drive circuit.
6. a kind of luminaire, it includes driver according to any one of claim 1 to 5 and by the driver
At least one light emitting diode driven.
7. a kind of method for controlling driver, the driver is used to drive by the power received from electronic transformer
Operation element, and including input stage, buffer stage, output stage, wherein：
The input stage is configured as providing power to the buffer stage, and the first mode of operation and the first shutdown mode it
Between switch over to cause the output voltage of the buffer stage to keep constant, in first mode of operation, the electronics becomes
Depressor comes to provide power to the input stage with the minimum output current higher than the electronic transformer, and in the described first shut-off
In pattern, the electronic transformer does not provide power to the input stage；
The buffer stage is configured as from the input stage receiving power, and provides power to the output stage；
The output stage is configured as providing power to the operation element, and in the second mode of operation and the second shutdown mode
Between switch over, in second mode of operation, the buffer stage provides power to the output stage, and described second
In shutdown mode, the buffer stage does not provide power to the output stage；And
Methods described includes：
Based on the sampling for the voltage that the input stage is supplied to the electronic transformer, or based on the first dutycycle and second
Dutycycle, it is determined that being to adjust first dutycycle so that the input stage is supplied to the mean power of the buffer stage to keep permanent
It is fixed, or adjusting second dutycycle causes the buffer stage to be supplied to the mean power of the output stage to change, wherein, institute
State the first dutycycle and refer to that time of the input stage in first mode of operation accounts for the input stage in described
First mode of operation and the ratio of the total time in first shutdown mode, and second dutycycle refers to the output
The time that level is in second mode of operation accounts for the output stage and is in second mode of operation and second shut-off
The ratio of total time in pattern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210201477.7A CN103517490B (en) | 2012-06-15 | 2012-06-15 | Driver, luminaire and the method for controlling driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210201477.7A CN103517490B (en) | 2012-06-15 | 2012-06-15 | Driver, luminaire and the method for controlling driver |
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| Publication Number | Publication Date |
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| CN103517490A CN103517490A (en) | 2014-01-15 |
| CN103517490B true CN103517490B (en) | 2017-08-22 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1801589A (en) * | 2005-10-12 | 2006-07-12 | 珠海格力电器股份有限公司 | Direct-current power supply device and method for adjusting output power thereof |
| CN202050568U (en) * | 2011-03-31 | 2011-11-23 | 南京汉德森科技股份有限公司 | Light-emitting diode (LED) TRIAC dimming control system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2280468B1 (en) * | 2009-07-28 | 2015-09-09 | STMicroelectronics Srl | Driving circuit for an electric load and system comprising the circuit |
-
2012
- 2012-06-15 CN CN201210201477.7A patent/CN103517490B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1801589A (en) * | 2005-10-12 | 2006-07-12 | 珠海格力电器股份有限公司 | Direct-current power supply device and method for adjusting output power thereof |
| CN202050568U (en) * | 2011-03-31 | 2011-11-23 | 南京汉德森科技股份有限公司 | Light-emitting diode (LED) TRIAC dimming control system |
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| CN103517490A (en) | 2014-01-15 |
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