CN103368399A - Unloaded output end allowing load driver and method applied to same - Google Patents
Unloaded output end allowing load driver and method applied to same Download PDFInfo
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- CN103368399A CN103368399A CN2012100854830A CN201210085483A CN103368399A CN 103368399 A CN103368399 A CN 103368399A CN 2012100854830 A CN2012100854830 A CN 2012100854830A CN 201210085483 A CN201210085483 A CN 201210085483A CN 103368399 A CN103368399 A CN 103368399A
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Abstract
The invention disclose an unloaded output end allowing load driver and a method applied to the same. The load driver comprises a plurality of output ends and a switch device, wherein the plurality of the output ends are configured in such a way that a plurality of driving voltages or currents are respectively output to loads by the plurality of the output ends, the switch device is connected between a first output end and a second output end among the plurality of the output ends, the switch device is configured in such a way that the first output end and the second output end are connected through the switch device when the first output end or the second output end is unloaded, and therefore the first output end and the second output end are enabled to be connected in aparallel.
Description
Technical field
Present invention relates in general to the load driver field, specifically, relate to a kind of load driver that can allow some the output zero loads in a plurality of outputs.The method that the invention still further relates to a kind of load driver for having a plurality of outputs is unloaded with some outputs that allow a plurality of outputs.
Background technology
In requiring the load driver of output high-power, in order to satisfy relevant safety standard etc., can use multichannel output.But, for existing multichannel output driver, there is a problem, i.e. each simultaneously loading of road output or not loading, otherwise driver can't work.At present, light-emitting diode (LED) has obtained using more and more widely as a kind of novel green lighting source of DC driven that adopts, and the problems referred to above exist in the high-capacity LED driver with multichannel output equally.
Safer for the use that makes LED, usually require driving voltage to be lower than 60V or 120V (direct voltage), therefore, the high-capacity LED driver has the output more than one tunnel usually.When some output connects load (zero load) for a certain reason and not; for some topological drivers; such as adopting current transformer to come the driver of the output current between the output of balance two-way; the output voltage of unloaded output may become very high and surpass overvoltage protection (OVP) restriction; thereby the trigger protection circuit, so that driver quits work.
For example, multichannel output single-stage flyback power factor correction (PFC) circuit as shown in Fig. 1 a, when output CH2 is connected with the LED load and output CH1 unsettled (i.e. during zero load), leakage inductance between the secondary winding is so that the output voltage of output CH1 becomes very high, triggers the OVP circuit and driver is quit work.
In addition, shown in Fig. 1 b, this led driver adopts single-stage inverse-excitation type PFC+ step-down (buck) converter, the structure of this multichannel output allows output unloaded, but for example in output CH2 loading and CH1 when unsettled, step-down transformer 1 can not cut out fully.Therefore, cause the in this case Efficiency Decreasing of driver, simultaneously, owing to need buck converter, increased extra parts, thereby improved cost.
Summary of the invention
In view of above problem, made the present invention.The invention is intended to provide a kind of load driver that has a plurality of outputs and allow some the output zero loads in a plurality of outputs, and a kind of method of the load driver for having a plurality of outputs is unloaded with some outputs that allow a plurality of outputs.
According to an aspect of the present invention, provide a kind of load driver, having comprised: a plurality of outputs are configured to export multichannel driving voltage or electric current to load respectively; And be connected to the first output in described a plurality of output and the switching device between the second output, be configured to when described the first output or the second output are unloaded, connect, so that described the first output and the second output are connected in parallel.
According to another aspect of the present invention, provide a kind of be used to having respectively the method for load driver that multichannel driving voltage or electric current is exported to a plurality of outputs of load, comprising: whether the first output and the second output that detect in a plurality of outputs be unloaded; And at least one the unloaded situation in detecting described the first output and the second output, closure is connected to the switch between described the first output and described the second output.
Employing is according to load driver of the present invention and method, even some outputs are unloaded, load driver also can work, and has improved the efficient of driver.
By below in conjunction with the accompanying drawing the following detailed description of the embodiment of the present invention, these and other advantage of the present invention will be more obvious.
Description of drawings
In order further to set forth above and other advantage of the present invention and feature, below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.Described accompanying drawing comprises in this manual and forms the part of this specification together with following detailed description.Should be appreciated that these accompanying drawings only describe typical case of the present invention, and should not regard the restriction to scope of the present invention as.In the accompanying drawings:
Fig. 1 a is the schematic circuit of light-emitting diode (LED) driver of single-stage flyback power factor correction (PFC) circuit of the employing according to prior art with multichannel output;
Fig. 1 b is the schematic circuit of the led driver of the single-stage inverse-excitation type PFC+ decompression converter circuit of the employing according to prior art with multichannel output;
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 the schematic circuit of the load driver of the detailed configuration that shows switching device according to an embodiment of the invention.
Embodiment
In connection with accompanying drawing exemplary embodiment of the present invention is described hereinafter.For convenience of explanation, in described exemplary embodiment, adopt light-emitting diode (LED) as load, and this led driver is for adopting the driver of the single-stage inverse-excitation type pfc circuit with multichannel output.But should be understood that the applied load of the present invention and activation configuration are not limited to this, embodiment as described herein just is used for explanation, and is not construed as limiting the invention.Scope of the present invention is only limited by claims and equivalents thereof.
Should be noted that for purpose clearly, omitted expression and the description of parts that have nothing to do with the present invention, known to persons of ordinary skill in the art and processing in accompanying drawing and the explanation.In addition, should emphasize that term " comprises/comprise " existence that refers to feature, key element, step or assembly when this paper uses, but not get rid of the existence of one or more further feature, key element, step or assembly or additional.
At first with reference to Fig. 2, load driver 100 according to the present invention comprises the load driver 101 with multichannel output, namely this load driver have a plurality of output CH1, CH2 ..., CHn.Between the first output CH1 and the second output CH2, be connected with switching device 102, be used at least one unloaded situation of the first output CH1 and the second output CH2, connecting.
In other words, for example when unloaded and the second output CH2 of the first output CH1 is connected to load, switching device 102 links together output CH1 and CH2, thereby the first output CH1 and the second output CH2 are connected in parallel, and the voltage of the first output CH1 is by the second output CH2 clamp.Like this, even the first output CH1 is unloaded, its voltage can be not too high and trigger overvoltage protection yet, thereby proof load driver 100 can work.That is, by above-mentioned configuration, can be so that needn't use simultaneously all outputs of multichannel output loading driver 101.
In addition, be connected between the first output CH1 and the second output CH2 although only show switching device 102 among the figure, it should be appreciated by those skilled in the art that as required, switching device 102 can also be connected between other outputs.
The configuration of switching device 102 according to an embodiment of the invention is described below with reference to Fig. 3.As shown in Figure 3, switching device 102 comprises unloaded test section 201 and switch 202.Wherein, whether two outputs (for example, the first output CH1 and the second output CH2) of connecting for detection of switching device 102 of unloaded test section 201 exist unloaded situation.If unloaded test section 201 detects at least one zero load in two outputs, be used for making the signal of switch 202 closures make switch 202 auto-closings thereby then produce.Switch 202 after the closure is the first output CH1 and the second output CH2 short circuit, thereby so that unloaded output also is connected to load, jointly provides load current by two outputs.
Fig. 4 shows the schematic circuit of load driver according to an embodiment of the invention.In Fig. 4, load is LED, and the driver that adopts is the single-stage inverse-excitation type pfc circuit with multichannel output.Single-stage inverse-excitation type pfc circuit comprises controller U1 and DC-to-DC (DC-DC) converter T1.Primary side at DC-DC converter T1 has a plurality of secondary coils, corresponds respectively to multichannel output.Wherein, the output of coil Ns1 is couple to the first output CH1 by diode D1, and the first output CH1 is by capacitor C1 ground connection.Resistor Rs1 is used for the electric current that sensing is exported from the first output to load, as the feed back input of controller U1.For the second output CH2 identical configuration is arranged, repeat no more.
Should note, this paper employed " coupling " is restricted to the direct connection that is illustrated between two or more circuit objects without any inserting circuit object, and between two or more circuit objects the indirect joint by one or more insertion circuit objects realizations.For example, two circuit objects that are connected to each other directly are called as each other " coupling ".If two same circuit objects are connected with one or more insertion circuit objects therebetween and then are also referred to as each other " coupling ".
In Fig. 4, the first output be connected output and connect by K switch.It should be noted that K switch herein is schematically, can use any parts or device with switching function in the reality.
As mentioned above, when for example and second output CH2 unloaded as the first output CH1 was connected with load, K switch was closed.The first output CH1 and the second output CH2 are connected in parallel, and load current equally distributes between the first output CH1 and the corresponding internal circuit of the second output CH2.Coil Ns1 and diode D1 and coil Ns2 and diode D2 are connected in parallel, and therefore the total internal driving of equivalence is about half of single channel output, thereby have improved the efficient of driver.Maximally utilised simultaneously circuit block.
Based on above-mentioned explanation, this driver can work under the situation of various load combinations, and still only has one tunnel output to be connected to load no matter two-way output all is connected to load.
The driver of describing Fig. 4 in detail below with reference to Fig. 5 is one tunnel operation principle when being output as zero load therein.Fig. 5 is the schematic circuit of the load driver of the detailed configuration that shows switching device according to an embodiment of the invention.
In Fig. 5, show in detail a kind of embodiment of switching device.Switching device comprises unloaded test section and switch TR1.Unloaded test section comprises operational amplifier U3_A, operational amplifier U3_B and switch driver.Switch TR1 can be TRIAC.
As shown in Figure 5, the inverting input of operational amplifier U3_B is coupled to respectively the first output CH1 and the second output CH2 by resistor R3 and corresponding diode D4.
The output voltage V o_CH2 of the output voltage V o_CH1 of the first output CH1 and the second output CH2 carries out the inverting input that voltage that dividing potential drop obtains is applied to operational amplifier U3_B by the bleeder circuit that is comprised of resistor R3 and R4.The in-phase input end of operational amplifier U3_B is connected to reference voltage V ref4.Thereby, operational amplifier U3_B is as voltage comparator, be configured to and compare corresponding to the first voltage V1 of the output voltage of the first output CH1 with corresponding to second voltage V2 and the reference voltage V ref4 of the output voltage of the second output CH2, when the first voltage V1 or second voltage V2 are higher than reference voltage V ref4, operational amplifier U3_B output LOW voltage level.
In addition, the output of operational amplifier U3_B is connected to the inverting input of operational amplifier U3_A, when operational amplifier U3_B output LOW voltage level, as the operational amplifier U3_A output HIGH voltage level of voltage comparator.
The output of operational amplifier U3_A is connected to switch driver, and switch driver is connected to TRIAC TR1.When operational amplifier U3_A output HIGH voltage level, switch driver amplifies this signal and trigger switch TR1 connects.Thereby the first output CH1 and the second output CH2 are connected in parallel, and the load current of LED is provided jointly by both.
In other words, when the first output CH1 and the second output CH2 all were connected with load, above-mentioned drive operation was under normal condition, and switching device is in off-state, on circuit without impact.When unloaded and the second output CH2 of the first output CH1 is connected to load, because the characteristic of current transformer and so that the output voltage V o_CH1 of the first output CH1 becomes very high.When Vo_CH1 reached certain value such as Vo_max, the voltage on the resistor R4 became and is higher than Vref4, operational amplifier U3_B output LOW voltage level, thus electric current flows through optical coupler OT1, and OT1 is with this signal back controller U1, so that regulation output voltage.
In said circumstances, the inverting input of operational amplifier U3_A is low voltage level, is lower than the reference voltage V ref3 of in-phase input end, thus operational amplifier U3_A output HIGH voltage level, and switch driver amplifies this signal and comes trigger switch TR1 to connect.After switch TR1 connects, the first output CH1 and the second output CH2 short circuit, thereby so that the voltage Vo_CH1 of the first output CH1 is approximately equal to the voltage Vo_CH2 of the second output CH2, and the two is all less than maximum output voltage Vo_max.That is, driver finally works, and because in fact the first output CH1 and the second output CH2 be connected in parallel so that the inside circuit impedance approximately reduces by half, so drive efficiency improves.
In like manner, when the first output CH1 is connected to load and the second output CH2 when unloaded, the TR1 connection that also is triggered, identical with above-mentioned situation, driver finally works and has improved efficient owing to the inside circuit impedance reduces by half.
In addition, in Fig. 5, controller U1 is the LLC controller L 6599 of ST company.Wherein, the operational amplifier U2_A of constant current feedback circuit and the inverting input of U2_B are connected to respectively load current sense terminals CH1_S and CH2_S, thereby the load current of resistor Rs1 and Rs2 sensing is fed back to controller U1 by operational amplifier U2_A and U2_B and optical coupler OT1 respectively, so that regulation output voltage.
Although a kind of embodiment of switching device has been shown among Fig. 5, also can have adopted other the replacement circuit with identical function or module to realize this switching device.In addition, carry out in change those skilled in the art's the limit of power of the selection of practical devices and circuit structure according to instruction of the present invention.
In sum, it is unloaded that load driver allows some outputs in a plurality of outputs according to an embodiment of the invention, and improved the efficient of driver.
Although abovely described the present invention with reference to specific embodiment, should be appreciated that described embodiment only is illustrative rather than determinate.For a person skilled in the art, in the situation that does not deviate from the spirit and scope of the invention, can carry out various modifications and change.Scope of the present invention is only limited by appended claim and equivalents thereof.
Claims (13)
1. load driver comprises:
A plurality of outputs are configured to export multichannel driving voltage or electric current to load respectively; And
Be connected to the first output in described a plurality of output and the switching device between the second output, be configured to when described the first output or the second output are unloaded, connect, so that described the first output and the second output are connected in parallel.
2. load driver according to claim 1, wherein,
Described switching device comprises unloaded test section and switch, is configured to produce the signal that is used for making described switch closure when described unloaded test section detects described the first output or the zero load of the second output.
3. load driver according to claim 2, wherein said unloaded test section comprises:
The first operational amplifier, be configured to and compare corresponding to the first voltage of the output voltage of described the first output with corresponding to second voltage and the reference voltage of the output voltage of described the second output, when described the first voltage or described second voltage are higher than described reference voltage, described the first operational amplifier output LOW voltage level;
The second operational amplifier, its inverting input is connected to the output of described the first operational amplifier, and is configured to output HIGH voltage level when described the first operational amplifier output LOW voltage level; And
Switch driver is connected to the output of described the second operational amplifier, and is configured to trigger when described the second operational amplifier output HIGH voltage level described switch closure.
4. load driver according to claim 3, wherein, described switch is TRIAC.
5. load driver according to claim 3, wherein, described the first voltage and second voltage are by respectively to the voltage of described the first output with the voltage of described the second output is carried out dividing potential drop obtain.
6. the described load driver of any one in 5 according to claim 1 also comprises the single-stage flyback power factor correction circuit with described a plurality of outputs.
7. load driver according to claim 6, wherein,
Described single-stage flyback power factor correction circuit comprises the 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 comprises the constant current feedback circuit, be used for the output current of described a plurality of outputs is fed back to described LLC controller, to regulate the output voltage of described a plurality of outputs.
10. the described load driver of any one in 5 according to claim 1, wherein said load is light-emitting diode.
11. one kind is used for having respectively the method for load driver that multichannel driving voltage or electric current is exported to a plurality of outputs of load, comprises:
Whether the first output and the second output that detect in a plurality of outputs be unloaded; And
In at least one unloaded situation in detecting described the first output and the second output, closure is connected to the switch between described the first output and described the second output.
12. method according to claim 11, wherein, described switch is TRIAC.
13. according to claim 11 or 12 described methods, wherein, described load is 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 |
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| 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 |
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| Publication Number | Publication Date |
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| CN103368399A true CN103368399A (en) | 2013-10-23 |
| CN103368399B CN103368399B (en) | 2017-03-01 |
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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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104167919A (en) * | 2014-08-14 | 2014-11-26 | 深圳市创维群欣安防科技有限公司 | Device for controlling flyback power source cross load output voltages |
| CN110402536A (en) * | 2017-03-17 | 2019-11-01 | 弗罗纽斯国际有限公司 | Welding current source |
| CN115224953A (en) * | 2022-09-21 | 2022-10-21 | 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 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104167919A (en) * | 2014-08-14 | 2014-11-26 | 深圳市创维群欣安防科技有限公司 | Device for controlling flyback power source cross load output voltages |
| 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 |
| CN110402536A (en) * | 2017-03-17 | 2019-11-01 | 弗罗纽斯国际有限公司 | Welding current source |
| CN110402536B (en) * | 2017-03-17 | 2020-12-25 | 弗罗纽斯国际有限公司 | Welding current source |
| US11660696B2 (en) | 2017-03-17 | 2023-05-30 | Fronius International Gmbh | Welding current source |
| CN115224953A (en) * | 2022-09-21 | 2022-10-21 | 茂睿芯（深圳）科技有限公司 | Multi-output synchronous buck converter and converter control method |
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