CN103368399B - Allow the unloaded load driver of outfan and method - Google Patents
Allow the unloaded load driver of outfan and method Download PDFInfo
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- CN103368399B CN103368399B CN201210085483.0A CN201210085483A CN103368399B CN 103368399 B CN103368399 B CN 103368399B CN 201210085483 A CN201210085483 A CN 201210085483A CN 103368399 B CN103368399 B CN 103368399B
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- outfan
- voltage
- load
- load driver
- unloaded
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Abstract
The invention discloses a kind of allow the unloaded load driver of outfan and method.Described load driver, including：Multiple outfans, are configured to export multichannel driving voltage or electric current to load；And it is connected to switching device between the first outfan in the plurality of outfan and the second outfan, it is configured as described first outfan or the second outfan is connected, so that described first outfan and the second outfan are connected in parallel when unloaded.
Description
Technical field
Present invention relates in general to load driver field, it particularly relates to one kind can allow in multiple outfans
The unloaded load driver of some outfans.The invention still further relates to a kind of load driver for having multiple outfans
Method is to allow some outfans in multiple outfans unloaded.
Background technology
In the load driver requiring output high-power, in order to meet safety criterion of correlation etc., it is possible to use multichannel
Output.But, for existing multiple-channel output driver, have a problem that, Ji Ge road output must loading simultaneously or
Not loading, otherwise driver will be unable to normal work.At present, light emitting diode (LED) is as a kind of employing DC driven
Novel green lighting source has obtained increasingly being widely applied, and the problems referred to above are driven in the high-capacity LED with multiple-channel output
Equally exist in dynamic device.
In order that LED using safer, usually require that driving voltage is less than 60V or 120V (DC voltage), therefore, high
Power LED driver generally has the output more than a road.When some outfans do not connect load (unloaded) for some reason and,
For some topological drivers, such as to balance the driver of the output current between two-way output using current transformer,
The output voltage of unloaded outfan may become very high and exceed overvoltage protection (OVP) limit, thus trigger protection circuit so that
Driver quits work.
For example, multiple-channel output single-stage flyback power factor correction (PFC) circuit as shown in fig. ia, works as outfan
CH2 is connected with LED load and outfan CH1 hanging when unloaded (i.e.), and the leakage inductance between secondary windings makes outfan CH1's
Output voltage becomes very high, triggers OVP circuit and so that driver is quit work.
In addition, as shown in Figure 1 b, this LED driver adopts single-stage inverse-excitation type PFC+ blood pressure lowering (buck) changer, this many
The structure of road output allows outfan unloaded, but, such as when outfan CH2 loading CH1 is hanging, step-down transformer 1
It is unable to completely close.Therefore, the efficiency leading to driver in this case reduces, simultaneously as needing buck converter, increases
Add extra part, thus improve cost.
Content of the invention
In view of problem above, make the present invention.The invention is intended to providing one kind to have multiple outfans and allow multiple
The unloaded load driver of some outfans in outfan, and a kind of load driver for having multiple outfans
Method is to allow some outfans in multiple outfans unloaded.
According to an aspect of the invention, it is provided a kind of load driver, including：Multiple outfans, are configured to point
Multichannel driving voltage or electric current are not exported to load；And it is connected to the first outfan and second in the plurality of outfan
Switching device between outfan, is configured as described first outfan or the second outfan is connected when unloaded, so that described
First outfan and the second outfan are connected in parallel.
According to another aspect of the present invention, there is provided one kind is used for having and exports multichannel driving voltage or electric current respectively
The method of the load driver of multiple outfans extremely loading, including：Detect the first outfan and second in multiple outfans
Whether outfan is unloaded；And the unloaded situation of at least one of described first outfan and second outfan is being detected
Under, closure is connected to the switch between described first outfan and described second outfan.
Using the load driver according to the present invention and method, even if some outfans are unloaded, load driver also can
Normal work, and improve the efficiency of driver.
By below in conjunction with accompanying drawing the following detailed description of the embodiment of the present invention, the these and other of the present invention is excellent
Point will be apparent from.
Brief description
In order to the above and other advantages and features of the present invention are expanded on further, concrete to the present invention below in conjunction with the accompanying drawings
Embodiment is described in further detail.Described accompanying drawing together with detailed description below comprise in this manual and
Form the part of this specification.It should be appreciated that these accompanying drawings only describe the typical case of the present invention, and it is not to be taken as to this
The restriction of the scope of invention.In the accompanying drawings：
Fig. 1 a is using single-stage flyback power factor correction (PFC) circuit with multiple-channel output according to prior art
Light emitting diode (LED) driver schematic circuit；
Fig. 1 b is using the single-stage inverse-excitation type PFC+ decompression converter circuit with multiple-channel output according to prior art
The schematic circuit of LED driver；
Fig. 2 is the structured flowchart of load driver according to an embodiment of the invention；
Fig. 3 is the structured flowchart of switching device according to an embodiment of the invention；
Fig. 4 is the schematic circuit of load driver according to an embodiment of the invention；And
Fig. 5 is showing of the load driver of the detailed configuration showing switching device according to an embodiment of the invention
Meaning property circuit diagram.
Specific embodiment
Hereinafter in connection with accompanying drawing, the exemplary embodiment of the present invention is described.For convenience of description, retouched
Adopt light emitting diode (LED) in the exemplary embodiment stated as load, and this LED driver is defeated using having multichannel
The driver of the single-stage inverse-excitation type pfc circuit going out.It is to be understood that the load applied of the present invention and activation configuration do not limit
In this, embodiment as described herein is only intended to illustrate, and is not construed as limiting the invention.The scope of the present invention is only by institute
Attached claim and its equivalents are limiting.
It should be noted that for purposes of clarity, in accompanying drawing and explanation, eliminate unrelated to the invention, the common skill in this area
Part known to art personnel and the expression processing and description.Additionally it should emphasize, when term "comprises/comprising" uses herein
Refer to feature, the presence of key element, step or assembly, but be not precluded from one or more further features, key element, step or assembly
Exist or additional.
With reference first to Fig. 2, include the load driver 101 with multiple-channel output according to the load driver 100 of the present invention,
I.e. this load driver have multiple outfan CH1, CH2 ..., CHn.In the first outfan CH1 and the second outfan CH2
Between be connected with switching device 102, for the feelings unloaded at least one of the first outfan CH1 and the second outfan CH2
Connect under condition.
In other words, for example, when the first outfan CH1 zero load the second outfan CH2 is connected to load, switching device 102 will
Outfan CH1 and CH2 links together, so that the first outfan CH1 and the second outfan CH2 is connected in parallel, the first output
The voltage of end CH1 is clamped by the second outfan CH2.So, even if the first outfan CH1 is unloaded, its voltage also will not too high and
Triggering overvoltage protection, thus proof load driver 100 can be with normal work.That is, by above-mentioned configuration, so that need not be same
When using multiple-channel output load driver 101 all outputs.
In addition, though in figure illustrate only switching device 102 be connected to the first outfan CH1 and the second outfan CH2 it
Between, but it should be appreciated by those skilled in the art, as needed, switching device 102 can also be connected to other outfans it
Between.
The configuration of switching device 102 according to an embodiment of the invention is described referring to Fig. 3.As shown in figure 3, opening
Close device 102 and include unloaded detection part 201 and switch 202.Wherein, unloaded detection part 201 is used for detection switch device 102
Two outfans (for example, first outfan CH1 and the second outfan CH2) being connected whether there is no-load condition.If empty
Carry detection part 201 zero load of at least one of two outfans is detected, then produce for make switch 202 close signal from
And so that switch 202 is automatically closed.Switch 202 after closure is short-circuit by the first outfan CH1 and the second outfan CH2, so that
Obtain unloaded outfan to be also connected to load, jointly provide load current by two outfans.
Fig. 4 shows the schematic circuit of load driver according to an embodiment of the invention.In the diagram, bear
Carry as LED, the driver being adopted is that have the single-stage inverse-excitation type pfc circuit of multiple-channel output.Single-stage inverse-excitation type pfc circuit includes
Controller U1 and DC-to-dc (DC-DC) changer T1.There are multiple secondary coils in the primary side of DC-DC converter T1, respectively
Corresponding to multiple-channel output.Wherein, the output of coil Ns1 is couple to the first outfan CH1 by diode D1, and the first outfan
CH1 is grounded by capacitor C1.Resistor Rs1 is used for sensing from the first outfan to the electric current of load output, as controller
The feed back input of U1.There is identical to configure for the second outfan CH2, repeat no more.
It should be noted that " coupling " used herein is defined as representing not any between two or more circuit objects
Insert being directly connected to of circuit object, and by one or more insertion circuit objects between two or more circuit objects
That realizes is indirectly connected with.For example, two circuit objects being connected to each other directly are referred to as " coupling " each other.Two same circuit
If object is connected with one or more insertion circuit objects therebetween, also referred to as " couple " each other.
In the diagram, the first outfan and the second outfan pass through to switch K connection.It should be noted that switch K herein is to illustrate
Property, in practice can be using any part or the device with switching function.
As described above, for example when the first outfan CH1 is unloaded and the second outfan CH2 is connected with load, switch K closes
Close.First outfan CH1 and the second outfan CH2 is connected in parallel, and load current is in the first outfan CH1 and the second outfan
Equally distribute between internal circuit corresponding to CH2.Coil Ns1 and diode D1 is in parallel with coil Ns2 and diode D2 even
Connect, therefore equivalent total internal driving is about the half of single channel output, thus improve the efficiency of driver.To greatest extent simultaneously
Make use of circuit block.
Based on described above, this driver can in the case of various load combinations normal work, but regardless of two-way is defeated
Still only one tunnel output is connected to load to go out all to be connected to load.
A road is output as operation principle during zero load wherein to describe the driver of Fig. 4 in detail referring to Fig. 5.Fig. 5 is
The schematic circuit of the load driver of the detailed configuration showing switching device according to an embodiment of the invention.
Show in detail a kind of specific embodiment of switching device in Figure 5.Switching device includes unloaded detection part
With switch TR1.Unloaded detection part includes operational amplifier U3_A, operational amplifier U3_B and switch driver.Switch TR1 can
Think TRIAC.
As shown in figure 5, the inverting input of operational amplifier U3_B passes through resistor R3 and corresponding diode D4 respectively
It is coupled to the first outfan CH1 and the second outfan CH2.
The output voltage Vo_CH2 of the output voltage Vo_CH1 of the first outfan CH1 and the second outfan CH2 passes through by electricity
The bleeder circuit of resistance device R3 and R4 composition carries out the inverting input that the voltage that partial pressure obtains is applied to operational amplifier U3_B.Fortune
The in-phase input end calculating amplifier U3_B connects to reference voltage V ref4.Thus, operational amplifier U3_B is used as voltage ratio relatively
Device, is configured to by first voltage V1 of the output voltage corresponding to the first outfan CH1 with corresponding to the second outfan CH2's
Second voltage V2 of output voltage and reference voltage V ref4 are compared, and are higher than benchmark in first voltage V1 or second voltage V2
During voltage Vref4, operational amplifier U3_B exports low voltage level.
Additionally, the outfan of operational amplifier U3_B connects to the inverting input of operational amplifier U3_A, put in computing
During big device U3_B output low voltage level, the operational amplifier U3_A output HIGH voltage level as voltage comparator.
The outfan of operational amplifier U3_A connects to switch driver, and switch driver connects to triode ac switch
Switch element TR1.When operational amplifier U3_A output HIGH voltage level, switch driver amplifies this signal trigger switch
TR1 connects.Thus, the first outfan CH1 and the second outfan CH2 are connected in parallel, and the load current of LED is carried jointly by both
For.
In other words, when the first outfan CH1 and the second outfan CH2 is respectively connected with load, above-mentioned driver is operated in
Under normal condition, switching device is off, and circuit is no affected.When the first outfan CH1 zero load the second outfan
When CH2 is connected to load, the output voltage Vo_CH1 of the first outfan CH1 is made to become very due to the characteristic of current transformer
High.When Vo_CH1 reaches certain value such as Vo_max, the voltage on resistor R4 becomes to be above Vref4, operational amplifier U3_
B export low voltage level, thus electric current flows through photo-coupler OT1, OT1 by this signal back controller U1 to adjust defeated
Go out voltage.
In said circumstances, the inverting input of operational amplifier U3_A is low voltage level, less than in-phase input end
Reference voltage V ref3, so operational amplifier U3_A output HIGH voltage level, and switch driver amplifies this signal to trigger out
Close TR1 to connect.After switch TR1 connects, the first outfan CH1 and the second outfan CH2 short circuit, so that the first output
The voltage Vo_CH1 of end CH1 is approximately equal to the voltage Vo_CH2 of the second outfan CH2, and the two is respectively less than maximum output voltage
Vo_max.That is, the final normal work of driver, and because the first outfan CH1 and the second outfan CH2 is actually connected in parallel
Circuit internal driving is about halved, therefore drive efficiency improves.
In the same manner, when the first outfan CH1 is connected to load the second outfan CH2 is unloaded when, TR1 is also triggered connection, with
Above-mentioned situation is identical, the final normal work of driver and improve efficiency because circuit internal driving halves.
In addition, in Figure 5, controller U1 is the LLC controller L 6599 of ST company.Wherein, the fortune of constant current feedback circuit
The inverting input calculating amplifier U2_A and U2_B is respectively connecting to load current sensing end CH1_S and CH2_S, thus by resistance
The load current of device Rs1 and Rs2 sensing feeds back to controller by operational amplifier U2_A and U2_B and photo-coupler OT1 respectively
U1, to adjust output voltage.
Although showing a kind of specific embodiment of switching device in Fig. 5, can also have phase using others
The replacement circuit of congenerous or module are realizing this switching device.In addition, carry out the choosing of practical devices according to the teachings of the present invention
Select in the limit of power changing those skilled in the art with circuit structure.
In sum, load driver allows some outfans in multiple outfans empty according to an embodiment of the invention
Carry, and improve the efficiency of driver.
Although describing the present invention above by reference to specific embodiment but it is to be understood that described embodiment is only to say
Bright property rather than determinate.For a person skilled in the art, in the feelings without departing substantially from the spirit and scope of the invention
Under condition, various modifications and changes can be carried out.The scope of the present invention only to be limited by appended claim and its equivalents.
Claims (13)
1. a kind of load driver, including：
Multiple outfans, are configured to export multichannel driving voltage or electric current to load；And
It is connected to the switching device between the first outfan in the plurality of outfan and the second outfan, be configured as institute
State the first outfan or the second outfan is connected, so that described first outfan and the second outfan are connected in parallel when unloaded.
2. load driver according to claim 1, wherein,
Described switching device includes unloaded detection part and switch, is configured as described zero load detection part and detects described the
When one outfan or the second outfan are unloaded, produce the signal for making described switch closure.
3. load driver according to claim 2, wherein said zero load detection part includes：
First operational amplifier, is configured to the first voltage of the output voltage corresponding to described first outfan and corresponds to
The second voltage of output voltage of described second outfan is compared with reference voltage, in described first voltage or described second
When voltage is higher than described reference voltage, described first operational amplifier output low voltage level；
Second operational amplifier, its inverting input connects to the outfan of described first operational amplifier, and is configured as
Output HIGH voltage level during described first operational amplifier output low voltage level；And
Switch driver, connects to the outfan of described second operational amplifier, and is configured as described second operation amplifier
Described switch closure is triggered during device output HIGH voltage level.
4. load driver according to claim 3, wherein, described switchs as TRIAC.
5. load driver according to claim 3, wherein, described first voltage and second voltage are passed through respectively to described
The voltage of the first outfan and partial pressure acquisition is carried out to the voltage of described second outfan.
6. load driver as claimed in any of claims 1 to 5, also includes the list with the plurality of outfan
Level flyback power factor correction circuit.
7. load driver according to claim 6, wherein,
Described single-stage flyback power factor correction circuit includes LLC controller.
8. load driver according to claim 7, wherein,
Described LLC controller is L 6599.
9. load driver according to claim 7, wherein said single-stage flyback power factor correction circuit also includes
Constant current feedback circuit, for the output current of the plurality of outfan is fed back to described LLC controller, the plurality of to adjust
The output voltage of outfan.
10. load driver as claimed in any of claims 1 to 5, wherein said load is light emitting diode.
11. a kind of for have respectively by multichannel driving voltage or electric current export to load multiple outfans load driver
Method, including：
Detect whether the first outfan in multiple outfans and the second outfan are unloaded；And
In the case of the zero load of at least one of described first outfan and second outfan is detected, closure is connected to described
Switch between first outfan and described second outfan.
12. methods according to claim 11, wherein, described switch as TRIAC.
13. methods according to claim 11 or 12, wherein, described load as light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210085483.0A CN103368399B (en) | 2012-03-28 | 2012-03-28 | Allow the unloaded load driver of outfan and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210085483.0A CN103368399B (en) | 2012-03-28 | 2012-03-28 | Allow the unloaded load driver of outfan and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103368399A CN103368399A (en) | 2013-10-23 |
| CN103368399B true CN103368399B (en) | 2017-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210085483.0A Expired - Fee Related CN103368399B (en) | 2012-03-28 | 2012-03-28 | Allow the unloaded load driver of outfan and method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104167919B (en) * | 2014-08-14 | 2017-02-22 | 深圳市创维群欣安防科技股份有限公司 | Device for controlling flyback power source cross load output voltages |
| EP3376659A1 (en) | 2017-03-17 | 2018-09-19 | Fronius International GmbH | Welding current source |
| CN115224953B (en) * | 2022-09-21 | 2022-12-13 | 茂睿芯（深圳）科技有限公司 | Multi-output synchronous buck converter and converter control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1889803A (en) * | 2005-06-27 | 2007-01-03 | 深圳市中电照明有限公司 | LED load protector line |
| CN201821553U (en) * | 2010-09-19 | 2011-05-04 | 英飞特电子（杭州）有限公司 | Open-circuit protecting circuit of light emitting diode constant-current driving circuit |
| CN102130614A (en) * | 2011-01-11 | 2011-07-20 | 深圳创维－Rgb电子有限公司 | Multi-path output switch power supply circuit, switch power supply and device with same |
| JP2011254014A (en) * | 2010-06-03 | 2011-12-15 | On Semiconductor Trading Ltd | Luminous element control circuit |
-
2012
- 2012-03-28 CN CN201210085483.0A patent/CN103368399B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1889803A (en) * | 2005-06-27 | 2007-01-03 | 深圳市中电照明有限公司 | LED load protector line |
| JP2011254014A (en) * | 2010-06-03 | 2011-12-15 | On Semiconductor Trading Ltd | Luminous element control circuit |
| CN201821553U (en) * | 2010-09-19 | 2011-05-04 | 英飞特电子（杭州）有限公司 | Open-circuit protecting circuit of light emitting diode constant-current driving circuit |
| CN102130614A (en) * | 2011-01-11 | 2011-07-20 | 深圳创维－Rgb电子有限公司 | Multi-path output switch power supply circuit, switch power supply and device with same |
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| CN103368399A (en) | 2013-10-23 |
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