CN103889094B - Drive device and lighting device for luminescence unit - Google Patents
Drive device and lighting device for luminescence unit Download PDFInfo
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- CN103889094B CN103889094B CN201210559949.6A CN201210559949A CN103889094B CN 103889094 B CN103889094 B CN 103889094B CN 201210559949 A CN201210559949 A CN 201210559949A CN 103889094 B CN103889094 B CN 103889094B
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Abstract
This disclosure relates to which a kind of be used to drive the drive device of luminescence unit and the lighting device including the drive device.The drive device includes：Input block, for receiving AC supply voltage and being output as the line voltage distribution that luminescence unit is powered；Switch element, operates to power to luminescence unit for receiving circuit voltage and according to switch controlling signal with on-off mode；Current detecting unit, is detected for the input current to luminescence unit and exports detection electric current；Current compensation unit, compensation electric current is provided for generating compensation electric current and determining whether according to line voltage distribution；And control unit, provide switch controlling signal to switch element for the compensation electric current according to the detection electric current exported from current detecting unit and from the output of current compensation unit.The drive device can reduce input current total harmonic distortion, and input current total harmonic distortion is reduced into less than 20%.In addition, the drive device have the advantages that it is simple in construction, with low cost.
Description
Technical field
The disclosure relates generally to the technical field of illumination, in particular it relates to a kind of driving for being used to drive luminescence unit
Device, more particularly to one kind can reduce input current total harmonic distortion（THD）Be used for drive the drive device of luminescence unit.
In addition, the disclosure further relates to a kind of lighting device including the drive device.
Background technology
In recent years, light emitting diode（LED）Light fixture（Containing LED/light source and drive device）It is used as the energy saving and environment friendly illumination of one kind
Light fixture is promoted rapidly, is widely used in home lighting, automotive lighting, architectural lighting, medical illumination and decorative lighting etc.
Field.Cost continuous decrease and the continuous improvement of performance with high-brightness LED, it is contemplated that in the near future, LED's
Luminous efficiency is by the traditional lighting light fixture for such as fluorescent lamp that can match in excellence or beauty.Compared to traditional illuminator, LED has the life-span longer
And it is not mercurous the advantages of.
At present, the subject matter that LED is faced in actual applications is how to reduce the input of luminescence unit drive device
Current total harmonic distortion.
The content of the invention
Hereinafter will be given for the brief overview of the disclosure, so as to provide on the disclosure it is some in terms of it is basic
Understand.It should be appreciated that this general introduction is not the exhaustive general introduction on the disclosure.It is not intended to determine the pass of the disclosure
Key or pith, nor intended limitation the scope of the present disclosure.Its purpose only provides some concepts in simplified form,
In this, as the preamble in greater detail discussed later.
In view of the defect of above-mentioned prior art, the purpose of the disclosure is that the total harmonic wave of input current can be reduced by providing one kind
The drive device for being used to drive luminescence unit of distortion.
According to an aspect of this disclosure there is provided a kind of drive device for being used to drive luminescence unit, it includes：Input
Unit, for receiving AC supply voltage and being output as the line voltage distribution that luminescence unit is powered；Switch element, for receiving line
Road voltage and operated according to switch controlling signal with on-off mode to be powered to luminescence unit；Current detecting unit, for pair
The input current of luminescence unit is detected and exports detection electric current；Current compensation unit, for generate compensation electric current and
Determined whether to provide compensation electric current according to line voltage distribution；And control unit, received for basis from current detecting unit
Detect that electric current and the compensation electric current from the reception of current compensation unit provide switch controlling signal to switch element.
In addition, according to another aspect of the present disclosure, additionally providing a kind of lighting device, it includes the implementation according to the disclosure
The drive device and luminescence unit that are used to drive luminescence unit of example.
Input current total harmonic distortion can be reduced according to the drive device of the disclosure, input current total harmonic distortion is dropped
It is low to less than 20%.In addition, the drive device have the advantages that it is simple in construction, with low cost.
Brief description of the drawings
The disclosure can be by reference to being better understood, wherein in institute below in association with the description given by accompanying drawing
Have and used same or analogous reference in accompanying drawing to represent same or similar part.The accompanying drawing is together with following
Describe the part for including in this manual and being formed this specification together in detail, and for this is further illustrated
Disclosed preferred embodiment and the principle and advantage for explaining the disclosure.In the accompanying drawings：
Fig. 1 illustrates the schematic block diagram for being used to drive the drive device of luminescence unit according to the disclosure；
Fig. 2 illustrates the schematic block diagram of the current compensation unit included according to the drive device of the disclosure；
Fig. 3 illustrates the typical circuit figure of the prior art for being used to drive the drive device of luminescence unit；
Fig. 4 illustrates the schematic circuit for being used to drive the drive device of luminescence unit according to the disclosure；
Fig. 5 illustrates the oscillogram of each circuit parameter when the current compensation unit according to the disclosure is not used；
Fig. 6 illustrates the oscillogram of the input current when current compensation unit according to the disclosure is not used；
Fig. 7 illustrates the oscillogram of each circuit parameter when using the current compensation unit according to the disclosure；And
Fig. 8 illustrates the oscillogram of input current when using the current compensation unit according to the disclosure.
Embodiment
It is described hereinafter in connection with accompanying drawing one exemplary embodiment of this disclosure.For clarity and conciseness,
All features of actual embodiment are not described in the description.It should be understood, however, that developing any this actual implementation
Many decisions specific to embodiment can be made during mode, to realize the objectives of developer, and
These decisions may be changed with the difference of embodiment.
Herein, in addition it is also necessary to which explanation is a bit, in order to avoid having obscured the disclosure because of unnecessary details, in the accompanying drawings
It illustrate only with according to the closely related apparatus structure of the scheme of the disclosure, and eliminating and little other of disclosure relation
Details.
Illustrate the drive device for being used to drive luminescence unit according to the disclosure in more detail below by accompanying drawing.Ying Li
Solution, the disclosure is not compromised by description as follows referring to the drawings and is only limited to described form of implementation.
Fig. 1 illustrates the schematic of one embodiment of the drive device 1 for driving luminescence unit according to the disclosure
Block diagram.As shown in fig. 1, input block 10, switch list are included according to the drive device 1 for being used to drive luminescence unit of the disclosure
Member 11, control unit 12, current detecting unit 13 and current compensation unit 14.It also show in Fig. 1 by according to the disclosure
The luminescence unit that drive device 1 drives.
In drive device 1, input block 10 can receive AC supply voltage Vin and export for being luminescence unit
The line voltage distribution Vbuck of 15 power supplies.Switch element 11 can with receiving circuit voltage Vbuck and according to switch controlling signal S1 with
On-off mode operates to power to luminescence unit 15.Current detecting unit 13 can be examined to the input current of luminescence unit 15
Survey and export detection electric current.Current compensation unit 14 can generate compensation electric current and be determined according to line voltage distribution Vbuck
Whether offer compensates electric current.Control unit 12 can be according to the detection electric current received from current detecting unit 13 and from current compensation
The compensation electric current that unit 14 is received provides switch controlling signal S1 to switch element 11.
Input block 10 is used to receive AC supply voltage Vin, and rectification, filtering, power factor school are carried out to exchange input
The operation just waited, and outlet line voltage.Input block 10 can have input 10-1 and output end 10-2.In operation
In, input block 10 receives AC supply voltage Vin on input 10-1.AC supply voltage Vin can be commercial
110V or 220V AC supply voltages or any other appropriate AC supply voltage.Input block 10 generally can be with
Including full-bridge rectifier, rectification is carried out for the alternating voltage to input.Input block 10 can also include filter circuit, be used for
Filter out the high-frequency harmonic composition that input voltage includes.In addition, input block 10 can include circuit of power factor correction, it is used for
Power factor is adjusted.Circuit of power factor correction can be APFC or passive power factor school
Positive circuit.AC supply voltage after input block 10 by being converted into line voltage distribution Vbuck, and line voltage distribution Vbuck exists
Exported on output end 10-2.It will be understood by those skilled in the art that in addition to foregoing circuit is configured, according to concrete application, input
Unit 10 can include any other the appropriate circuit configuration that can realize identical function.
Switch element 11 is used for receiving circuit voltage Vbuck and operates to power to luminescence unit 15 with on-off mode.
Switch element 11 can have input 11-1, output end 11-2 and control end 11-3.Input 11-1 is used to receive from input
The line voltage distribution Vbuck that unit 10 is exported.Control end 11-3 is used to receive switch controlling signal S1 and according to switch control letter
The mode that number S1 control is powered to luminescence unit 15.Output end 11-2 is used to export the voltage for powering to luminescence unit 15.Generally,
Switch element 11 can have the switch element and energy-storage travelling wave tube being connected to each other.Switch element for example can be metal oxide half
Conductor field-effect transistor（MOSFET）, bipolar transistor, insulated gate bipolar transistor（IGBT）Deng.Energy-storage travelling wave tube is for example
Can be capacitor, inductor etc..The switch controlling signal S1 of outside input is used for the turn-on and turn-off of controlling switch element, from
And control the charging and discharging of energy-storage travelling wave tube.During the charging of energy-storage travelling wave tube, luminescence unit 15 is entered by line voltage distribution Vbuck
Row power supply, and during the electric discharge of energy-storage travelling wave tube, the electric energy stored on energy-storage travelling wave tube is powered to luminescence unit 15.Switch
Unit 11 for example can be booster type switch element or adjusting and voltage-reduction switch unit.It will be understood by those skilled in the art that except above-mentioned
Beyond circuit configuration, according to concrete application, switch element 11 can include realizing identical function any other is appropriate
Circuit is configured.
Current detecting unit 13 is used to detect the input current of luminescence unit 15, and is provided to control unit 12
Detect electric current.Current detecting unit has test side 13-1 and output end 13-2.Test side 13-1 is used for switch element 11
Output current, is also with regard to driving the electric current of luminescence unit 15 to be detected.Then, the detection electric current obtained is via output end
13-2 is output in control unit 12.It will be understood by those skilled in the art that in addition to foregoing circuit is configured, being answered according to specific
With current detecting unit 13 can include any other the appropriate circuit configuration that can realize identical function.
Current compensation unit 14 is used to be determined whether to provide compensation electric current according to line voltage distribution.Current compensation unit 14 can be with
With current input terminal 14-1, sensing signal input 14-2 and current output terminal 14-3, wherein current input terminal 14-1 is from outer
Portion source obtains compensation electric current, and sensing signal input 14-2 is connected to the input 11-1 of switch element 11 with receiving circuit voltage
Vbuck, and current output terminal 14-3 is connected to the output end 13-2 of current detecting unit 13.
As a specific embodiment of current compensation unit 14, as shown in Figure 2, current compensation unit 14 can include
Compensate current acquisition circuitry 141, compensation electric current and control circuit 142 and compensation current output circuit 143 are provided.Electric current is compensated to obtain
Circuit 141 can obtain compensation electric current from the input block 10 as external source, can also be from other circuit portions of drive device
Part obtains compensation electric current.Compensation electric current provides control circuit 142 and is determined whether to provide compensation electric current according to line voltage distribution Vbuck,
And compensate current output circuit 143 and be supplied to control unit 12 by electric current is compensated.Compensate electric current control circuit 142 is provided can be with
With switch element, the switch element is described in detail below with reference to Fig. 4.The input of the switch element is couple to compensation electric current
Obtain circuit 141, the control end of the switch element be couple to line voltage distribution Vbuck and according to line voltage distribution Vbuck conductings or
Shut-off.When line voltage distribution Vbuck is more than or equal to the threshold voltage of the switch element, the switching elements conductive and electricity is compensated
The compensation electric current that stream obtains the acquisition of circuit 141 flows into ground via the switch element, and when line voltage distribution Vbuck is less than the threshold value
During voltage, the switch element turns off and compensates the compensation current direction compensation electric current output electricity of the acquisition of current acquisition circuitry 141
Road 143.It will be understood by those skilled in the art that in addition to foregoing circuit is configured, according to concrete application, current compensation unit 14 can
With including that can realize that any other appropriate circuit of identical function is configured.
The detection electric current and current compensation unit 14 that control unit 12 is used to be exported according to current detecting unit 13 are exported
Compensation electric current provide switch controlling signal S1 to switch element 11.Control unit 12 can have sensing end 12-1 and output end
12-2, wherein sensing end 12-1 on sense from current detecting unit 13 export detection electric current and current compensation unit 14 it is defeated
The compensation electric current gone out, and provide switch controlling signal S1 to the control end 11-3 of switch element 11 on output end 12-2.This
Art personnel should be understood that in addition to foregoing circuit is configured, according to concrete application, and control unit 12 can include can be real
Any other appropriate circuit configuration of existing identical function.
Show that drive device 1 described above can reduce input current total harmonic distortion by experiment, using single
Input current total harmonic distortion can be reduced to less than 20% in the case of switch element 11.It is always humorous by reducing input current
Wave distortion, can not only reduce line loss, can also reduce harmonic pollution, improve power-efficient.In addition, the drive device 1
Have the advantages that simple in construction, with low cost.
In addition, also show lighting unit 15 in Fig. 1.Lighting unit 15 for example can be light emitting diode.Illumination is single
Member 15 is combined with drive device 1 may make up lighting device.
Next, the specific implementation for being used to drive the drive device of luminescence unit by description in accordance with an embodiment of the present disclosure
Example.
For ease of comparing, reference picture 3 is described to the typical circuit of the luminescence unit drive device 3 according to prior art first
Figure.
As shown in Figure 3, the control unit 32 of the luminescence unit drive device of prior art is by commercially available texas,U.S instrument
The luminescence unit driving chip LM3445U1 of device company production realizes that luminescence unit driving chip LM3445 details can be obtained
It is derived from web addresses http://www.ti.com/lit/ds/symlink/lm3445.pdf.
In figure 3, input block 30 detects circuit 302 and PFC electricity by full-bridge rectifier 301, line voltage distribution
Road 303 is constituted.Full-bridge rectifier 301 is used to carry out rectification to the alternating voltage of input, by the sine of the negative half period of input voltage
Waveform upset is the sinusoidal waveform of positive half cycle.Line voltage distribution detection circuit 302 is detected to rectified voltage, and will be examined
Survey result and be supplied to control unit 32.Circuit of power factor correction 303 carries out PFC to rectified voltage.Fig. 2
In circuit of power factor correction 303 using passive power factor correcting circuit form.Diode D2 shown in Fig. 2 is kept
The voltage of input power factor correction circuit is constantly in high level, prevents voltage inversion.In addition, the electricity shown in Fig. 2
Container C2 is used to filter out ripple voltage.Input block 30 exports the line voltage distribution Vbuck for being powered for switch element 31.
As shown in Figure 3, switch element 31 takes the form of adjusting and voltage-reduction switch unit, and it is by MOSFET Q2, inductor
T1-A, T1-B, capacitor C9, C11, diode D4 etc. are constituted.Q2 constitutes the switch element in switch element 31.Inductor
T1-A, T1-B and capacitor C9, C11 constitute the energy-storage travelling wave tube in switch element 31.The switch control exported when control unit 32
When signal processed turns on MOSFET Q2, luminescence unit is powered by line voltage distribution Vbuck and energy-storage travelling wave tube is charged, when opening
When pass control signal makes MOSFET Q2 shut-offs, luminescence unit is powered by energy-storage travelling wave tube.Diode D4 is used as fly-wheel diode,
For forming current loop when being powered by energy-storage travelling wave tube to luminescence unit.
In figure 3, resistor R4, R16 and R17 constitutes regulation circuit, for improving circuit control characteristic.
Current detecting unit 33 is made up of resistor R14, R15 and R29, because these resistors are connected to LM3445's
ISNS pins, therefore Rsense is referred to collectively as, the electric current for flowing through Rsense is referred to as Isense.According to above to switch element
31 description is understood, only when Q2 is turned on, and Isense flows into ground via Rsense, and now Isense is the defeated of switch element 31
Enter electric current.
Control unit 32 provides switch controlling signal according to the voltage on ISNS pins, to control Q2 turn-on and turn-off.
Voltage Vsense on ISNS pins is directly proportional to flowing through resistor Rsense electric current Isense.Specifically, when Vsense is big
In or equal to control unit 32 reference voltage Vref when, control unit 32 export switch controlling signal turn off Q2 so that
Energy-storage travelling wave tube in switch element 31 starts to power for luminescence unit.When Vsense is less than reference voltage Vref, control unit
The switch controlling signal of 32 outputs turns on Q2, so as to be powered by line voltage distribution Vbuck for luminescence unit.Here, reference voltage
Vref is the voltage on LM3445 FLTR2 pins, because the selection of reference voltage Vref is not related to the subject content of the disclosure,
Therefore it is not described further here.
As shown in Figure 3, the switch element 32 of driving luminescence unit 35 is connected by input block 31 with power network.Due to
Input block 31 includes substantial amounts of non-linear element, especially because the presence of Large Copacity filter condenser so that input is single
The angle of flow of commutation diode in member 31 becomes very narrow, could only be turned near the peak value of AC-input voltage, cause friendship
Flow input current and produce serious distortion, be changed into spike.Substantial amounts of harmonic component is contained in this current waveform, it is not only right
Power network is polluted, and also resulting in the active power exported after filtering significantly reduces, and power factor is greatly lowered.
Especially, when the drive device in Fig. 3 starts first, output voltage is Vbuck, and now Q2 is held on, because
This electric current provided by line voltage distribution Vbuck flows into ground by Rsense resistors.In order that Q2 shut-offs are, it is necessary to which Vsense is more than
Or equal to reference voltage Vref, it is therefore desirable to flow through Rsense high current.The electric current is generally higher than the instantaneous value of input current
Much, therefore in this case, high input current causes input current total harmonic distortion to be high.Because relatively low voltage needs
Relatively low input current flows through resistor Rsense, therefore when input voltage is low in half waveform in each sine wave, makes
Voltage reduction at resistor Rsense can cause the reduction of input current total harmonic distortion.
Next, by reference picture 4 describe according to one embodiment of the disclosure be used for drive the driving of luminescence unit to fill
Put 4.Note, each circuit unit shown in Fig. 4 in circuit, i.e. input block 40（And its including full-bridge rectifier 401,
Line voltage distribution detects circuit 402 and circuit of power factor correction 403）, switch element 41, control unit 42 and current detecting unit
43 function respectively with the corresponding circuit unit in Fig. 3, i.e. input block 30, switch element 31, control unit 32 and electric current
The function correspondence of detection unit 33, therefore repetitive description will not be done here.Circuit and Fig. 3 shown in Fig. 4 will only be described below
The difference of shown circuit.
Reference picture 4, further comprises current compensation unit 44 according to the drive device 4 of the disclosure.Current compensation unit 44
Mainly it is made up of MOSFET Q4 and resistor R7, R12, R16, R26 etc..As described above, current compensation unit 44 includes mending
Repay current acquisition circuitry, compensation electric current and control circuit and compensation current output circuit are provided.
Resistor R7 and R12 constitute compensation current acquisition circuitry.Resistor R7 and R12 is connected with input block 40.
Current compensation unit 44 can obtain from external source, i.e. input block 40 via resistor R7 and R12 and compensate electric current.Such as institute above
State, one embodiment that compensation electric current is only the disclosure is obtained from input block 40.Those skilled in the art are contemplated that difference
Embodiment, it can obtain compensation electric current from other circuit units of drive device 4.
MOSFET Q4 are the main elements that the compensation electric current constituted in current compensation unit 44 provides control circuit.Such as Fig. 3
Shown in, Q4 drain electrode is connected to resistor R7 and R12, Q4 grid are connected to line voltage distribution Vuck, and Q4 source electrode connects
Ground.
Resistor R16 and R26 constitute compensation current output circuit, and wherein resistor R16 is connected to the He of control unit 32
Between current detecting unit 43, and resistor R26 is connected between control unit 42 and Q4 drain electrode.
In operation, when line voltage distribution Vbuck is less than Q4 threshold voltage, Q4 shut-offs so that from resistor R7 and
R12 electric current flows into resistor R16 via resistor R26, and will generation voltage drop Vcomp on resistor R16.Now,
Voltage on the ISNS pins of control unit 42 be Vcomp and Vsense and.When as Vcomp and Vsense's and voltage
During more than or equal to reference voltage Vref, than the situation for not being incorporated to current compensation unit 44, the electricity on resistor Rsense
Pressure is relatively low and to flow through its electric current Isense be less, therefore is not in extra high input current, so as to
To reduce input current total harmonic distortion.During the threshold voltage for reaching Q4 when line voltage distribution Vbuck is further up, Q4 will be led
It is logical, therefore the compensation electric current from resistor R7 and R12 will flow into ground by Q4.
In the circuit shown in Fig. 4, resistor R26 resistance value is selected as the resistance value much larger than resistor R16, from
And the electric current for flowing through resistor R26 is much smaller than and flows through resistor R16 electric current, thus do not interfere with by resistor R4, R16 and
The normal work for the regulation circuit that R17 is constituted.In one embodiment, resistor R16 resistance value is 10k Ω and resistor
R26 resistance value is 260k Ω.
According to LM3445 operation principle, reference voltage Vref can rise with line voltage distribution Vbuck rising, but
The electric current for flowing through resistor R7 keeps constant, therefore resistor R12 presence is actually a kind of preferred scheme.That is, only
There is provided resistor R7 can complete to compensate the function of current acquisition circuitry.Further after addition resistor R12, resistor is flowed through
R12 electric current can slightly rise with line voltage distribution Vbuck rising so that voltage Vsense is with compared with slow way
Rise, this is favourable for reduction input current total harmonic distortion, and be proved by experiment.
Figure 4 illustrates the circuit for being used to drive the drive device of luminescence unit of one embodiment according to the disclosure
Configuration, but it will be understood by those skilled in the art that the disclosure is not limited to physical circuit configuration as shown in Figure 4.Not inclined
In the case of from the scope of the present disclosure and spirit, those skilled in the art can be according to concrete application and actual demand to each
Circuit element carries out various modifications.Especially current compensation unit 44 can be constituted with any other appropriate circuit element, as long as
These circuit elements can combine the function of realizing and provide compensation electric current.For example, as described above, compensation electric current provides control
Circuit can also be by except mos field effect transistor（MOSFET）Outside other have switch control work(
The device realization of energy, such as bipolar transistor, insulated gate bipolar transistor（IGBT）Deng.Moreover, various circuit elements
Design parameter is selected, and is also only intended merely to description and is conveniently provided, and is not intended to technical scheme of this disclosure and is constituted limit
It is fixed.Those skilled in the art easily can be related to other any suitable parameters as the case may be, equally can be real
The purpose of the existing disclosure.
The total harmonic wave of reduction input current for describing to be realized according to the drive device of the disclosure referring next to Fig. 5 to 8
The technique effect of distortion.
Fig. 5 illustrates the oscillogram of each circuit parameter when the current compensation unit according to the disclosure is not used.In Fig. 5
In, horizontally and vertically（Not shown in figure）Time and corresponding physical quantity are represented respectively（For example, voltage, electric current）.Such as Fig. 5 institutes
Show, curve 1 represents the voltage at capacitor C2 two ends, i.e. line voltage distribution Vbuck；Curve 2 represents the electricity at resistor Rsense two ends
Press Vsense；Curve 3 represents input voltage before bridge；And curve 4 represents input current before bridge.As can be seen from Fig. 5, first point
The voltage at the capacitor C2 two ends at peak is about 0.3V, and maximum input current is 376mA.
Fig. 6 illustrates the oscillogram of the input current when current compensation unit according to the disclosure is not used.In figure 6,
Transverse axis represents the time, and the longitudinal axis represents input current.As can be seen from Fig. 6, at the beginning and end of each half-sine wave, there is two
Individual current spike.
Fig. 7 illustrates the oscillogram of each circuit parameter when using the current compensation unit according to the disclosure.With Fig. 5 phases
Seemingly, horizontally and vertically（Not shown in figure）Time and corresponding physical quantity are represented respectively（For example, voltage, electric current）.In the figure 7,
Curve 1 represents the voltage at capacitor C2 two ends, i.e. line voltage distribution Vbuck；Curve 2 represents the voltage at resistor Rsense two ends
Vsense；Curve 3 represents input voltage before bridge；And curve 4 represents input current before bridge.From figure 7, it is seen that initial is some
The voltage at the capacitor C2 two ends at individual spike is almost nil, and input current slowly rises, and maximum input current is
127mA, is significantly reduced than the situation shown in Fig. 5.
Fig. 8 illustrates the oscillogram of input current when using the current compensation unit according to the disclosure.In fig. 8, it is horizontal
Axle represents the time, and the longitudinal axis represents input current.As can be seen from Fig. 8, by adding current compensation unit 14, hence it is evident that eliminate in figure
The current spike occurred at the beginning and end of each half-sine wave in 6, so as to reduce input current total harmonic distortion.
In summary, according to the disclosure, it can realize that input current is always humorous by adding some simple circuit elements
The reduction of wave distortion.Therefore, according to the simple in construction of the drive device of the disclosure, manufacturing cost is cheap.Using single decompression
In the case of type switch element, its input current total harmonic distortion can be reduced to less than 20%.
In addition, the disclosure additionally provides a kind of lighting device, it include according to the previous embodiment of the disclosure be used for drive
The drive device and the luminescence unit as light source of dynamic luminescence unit.The lighting device has the input current less than 20% total
Harmonic distortion.
Finally, in addition it is also necessary to explanation, term " comprising ", "comprising" or its any other variant are intended to non-exclusive
Property include so that process, method, article or equipment including a series of key elements not only include those key elements, and
Also include other key elements for being not expressly set out, or also include for this process, method, article or equipment inherently
Key element.In addition, in the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that in bag
Also there is other identical element in the process, method, article or the equipment that include the key element.
In addition, term " coupling " or " connection " are intended to include direct " coupling " respectively or directly " connected as used in this article
Connect " and indirectly " coupling " or indirect " connection ".
Although embodiment of the disclosure is described in detail with reference to accompanying drawing above, it is to be understood that reality described above
The mode of applying is only intended to illustrate the disclosure, and does not constitute limitation of this disclosure.For those skilled in the art, may be used
To make various changes and modifications the spirit and scope without departing from the disclosure to above-described embodiment.Therefore, the model of the disclosure
Enclose and only limited by appended claim and its equivalents.
Claims (7)
1. one kind is used for the drive device (1) of luminescence unit (15), it includes：
Input block (10), it is configured to receive AC supply voltage (Vin) and is output as the luminescence unit (15) confession
The line voltage distribution (Vbuck) of electricity；
Switch element (11), it is configured to receive the line voltage distribution (Vbuck) and according to switch controlling signal (S1) to open
Pass mode operates to power to the luminescence unit (15)；
Current detecting unit (13), it is configured to the input current for detecting the luminescence unit (15)；
Current compensation unit (14), it is configured to obtain compensation electric current and determined according to the line voltage distribution (Vbuck)
Whether the compensation electric current is provided；And
Control unit (12), it is configured to according to the detection electric current exported from the current detecting unit (13) and from the electricity
The compensation electric current for flowing compensating unit (14) output provides the switch controlling signal (S1) to the Switching Power Supply (11),
Wherein described current compensation unit (14) includes compensation current acquisition circuitry (141), compensation electric current and provides control circuit
(142) and compensation current output circuit (143), wherein it is described compensation current acquisition circuitry (141) from external source obtain it is described mend
Electric current is repaid, the compensation electric current provides control circuit (142) and determines whether to provide the benefit according to the line voltage distribution (Vbuck)
Electric current is repaid, and the compensation current output circuit (143) will under the control that the compensation electric current provides control circuit (142)
The compensation electric current is supplied to described control unit (12),
Wherein described compensation electric current, which provides control circuit (142), has switch element, and the switch element has input, output
End and control end, the input of the switch element are couple to compensation current acquisition circuitry (141), the control of the switch element
End be couple to the line voltage distribution (Vbuck) and according to the line voltage distribution (Vbuck) control the switching elements conductive or
Shut-off, and
Wherein when the line voltage distribution (Vbuck) is more than or equal to the threshold voltage of the switch element, the switch element
Turn on and the compensation electric current of compensation current acquisition circuitry (141) acquisition flows into described drive via the switch element
The ground side of dynamic device (1), and when the line voltage distribution (Vbuck) is less than the threshold voltage, the switch element is closed
Compensation current output circuit (143) described in the compensation current direction that disconnected and described compensation current acquisition circuitry is obtained.
2. drive device (1) according to claim 1, wherein the external source is the input block (10).
3. drive device (1) according to claim 1, wherein the switch element is metal oxide semiconductor field-effect
Transistor (MOSFET), bipolar transistor or insulated gate bipolar transistor (IGBT).
4. drive device (1) according to any one of claim 1 to 3, wherein compensation current output circuit includes first
Resistor (R16) and second resistance device (R26), the first resistor device (R16) be coupled in the current detecting unit (13) and
Between control unit (12), and the second resistance device (R26) is coupled in the compensation current acquisition circuitry (141) and described
Between control unit (12).
5. drive device (1) according to any one of claim 1 to 3, wherein compensation current acquisition circuitry includes the 3rd
Resistor (R7, R12), the 3rd resistor device (R7, R12) is coupled in the input block (10) and the compensation electric current is provided
Control between circuit (142), electric current is compensated for being obtained from the input block (10).
6. drive device (1) according to any one of claim 1 to 3, wherein the luminescence unit (15) is luminous two
Pole pipe.
7. a kind of lighting device, including luminescence unit, and being lighted for as described in any one of claim 1 to 6
The drive device (1) of unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210559949.6A CN103889094B (en) | 2012-12-20 | 2012-12-20 | Drive device and lighting device for luminescence unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN202009331U (en) * | 2011-05-05 | 2011-10-12 | 上海新进半导体制造有限公司 | Circuit for controlling constant current output in switch power source |
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