CN103118460B - Novel multi-path LED passive current-equalizing circuit and LED driving power source - Google Patents
Novel multi-path LED passive current-equalizing circuit and LED driving power source Download PDFInfo
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- CN103118460B CN103118460B CN201310035539.6A CN201310035539A CN103118460B CN 103118460 B CN103118460 B CN 103118460B CN 201310035539 A CN201310035539 A CN 201310035539A CN 103118460 B CN103118460 B CN 103118460B
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Abstract
The invention relates to a novel multi-path LED passive current-equalizing circuit. The novel multi-path LED passive current-equalizing circuit comprises an LLC (logical link control) converter, and is characterized in that the LLC converter provided with a first secondary winding, a second secondary winding, a first group of output current-equalizing circuits and a second group of output current-equalizing circuits is capable of realizing output of equalized current of four paths of LED strings; and a provided four-path passive equalized current outputting strategy based on the LLC converter can be developed to 2N random paths of equalized current output for different output voltage. The novel multi-path LED passive current-equalizing circuit has the advantages of simplicity, good current equalizing effect and the like. The invention further provides an LED driving power source utilizing the novel multi-path LED passive current-equalizing circuit.
Description
Technical field
The present invention relates to LED flow equalize technology field, particularly the passive flow equalizing circuit of a kind of novel LED multi-path and the LED driving power that adopts this flow equalizing circuit.
Background technology
In recent years, the present situation of energy scarcity makes the mankind more recognize the importance of energy-saving and emission-reduction.Therefore LED has the advantages such as life-span length, energy-conserving and environment-protective as a kind of novel lighting source, will occupy a tiny space at following lighting field, and the LED driving power of high efficient and reliable is the LED fast-developing key of throwing light on.
Great power LED often needs to use the structure of LED multi-path parallel connection in actual applications, yet the V-I characteristic difference of different branch LED can cause the problem of each road current unevenness etc., the equal Flow Policy in the time of therefore need to studying multichannel output.
Summary of the invention
Poor or because use the shortcomings such as coupling inductance causes circuit volume and loss is larger for the occasion current-sharing precision of the above output in existing passive equal Flow Policy Si road, the present invention proposes a kind of novel passive equal Flow Policy, the method for electric capacity current-sharing is applied to the occasion of multichannel output.
The present invention adopts following scheme to realize: the passive flow equalizing circuit of a kind of novel LED multi-path, comprise LLC converter, and it is characterized in that: described LLC converter has first and second secondary winding and first and second group output current-sharing circuit;
Described first group of output current-sharing circuit comprises the first current-sharing electric capacity, the first end of this first current-sharing electric capacity is connected with the first output of described the first secondary winding, the second end is connected with positive pole, the 3rd diode cathode of the first diode, and the negative pole of described the first diode is connected with the positive terminal of a LED lamp string; The second output of described the first secondary winding is connected with the negative pole of the positive pole of the second diode, the 4th diode, and the negative pole of described the second diode is connected with the positive terminal of the 2nd LED lamp string; The negative pole end of described first and second LED lamp string is connected with one end of the 3rd diode cathode, the first electric capacity, one end of the second electric capacity; The other end of described the first electric capacity is connected with the negative pole of described the first diode; The other end of described the second electric capacity is connected with the negative pole of described the second diode;
Described second group of output current-sharing circuit comprises the second current-sharing electric capacity, and the first end of this second current-sharing electric capacity is connected with the first output of described the second secondary winding, and the second end is connected with the positive pole of the 5th diode, the negative pole of the 7th diode; The negative pole of described the 5th diode is connected with the positive terminal of the 3rd LED lamp string; The second output of described the second secondary winding is connected with the negative pole of the positive pole of the 6th diode, the 8th diode; The negative pole of described the 6th diode is connected with the 4th LED lamp string positive terminal; The negative pole end of described the 3rd LED lamp string connects one the 3rd one end of current-sharing electric capacity and the positive pole of described the 4th diode; One end anodal and the 3rd electric capacity of the other end of described the 4th negative pole end of LED lamp string and the positive pole of described the 7th diode, the 8th diode cathode, the 3rd current-sharing electric capacity, the 3rd diode is connected; The other end of described the 3rd electric capacity is connected with the negative pole of described the 5th diode; One end of the 4th electric capacity is connected with the negative pole of described the 6th diode, and the other end is connected with the positive pole of described the 8th diode.
In an embodiment of the present invention, also comprise the 3rd secondary winding, the 3rd group of output current-sharing circuit and the 4th current-sharing electric capacity; Described the 4th current-sharing electric capacity is located between the negative pole end of described the 4th LED lamp string and the positive pole of described the 8th diode; Described the 3rd output current-sharing circuit comprises the 5th current-sharing electric capacity, the first end of the 5th current-sharing electric capacity is connected with the first output of described the 3rd secondary winding, the second end is connected with positive pole, the 11 diode cathode of the 9th diode, and the negative pole of described the 9th diode is connected with the positive terminal of the 5th LED lamp string; The second output of described the 3rd secondary winding is connected with the tenth positive pole of diode, the negative pole of the 12 diode, and the negative pole of described the tenth diode is connected with the positive terminal of the 6th LED lamp string; The negative pole end of described the 5th, six LED lamp strings is connected with one end of the 12 diode cathode, the 5th electric capacity, one end of the 6th electric capacity; The other end of described the 5th electric capacity is connected with the negative pole of described the 9th diode; The other end of described the 6th electric capacity is connected with the negative pole of described the tenth diode; The positive pole of described the 11 diode is connected with the negative pole end of described the 4th LED lamp string.
In an embodiment of the present invention, described secondary winding and the output current-sharing circuit of connection thereof can be expanded into the output current-sharing of 2N road, and wherein, N is not less than 1 natural number.
The present invention separately provides a kind of LED driving power that adopts the above-mentioned passive flow equalizing circuit of LED multi-path, it is characterized in that: comprising: a sampling resistor, this sampling resistor is serially connected with the negative pole end of a described LED lamp string, in order to gather LED lamp string operating current; Described operating current through a voltage ratio and photoelectric isolating circuit send to a LLC control circuit, this LLC control circuit according to described voltage ratio compared with and the comparative result of photoelectric isolating circuit control the work of described LLC converter.
In an embodiment of the present invention, also comprise the 3rd secondary winding, the 3rd group of output current-sharing circuit and the 4th current-sharing electric capacity; Described the 4th current-sharing electric capacity is located between the negative pole end of described the 4th LED lamp string and the positive pole of described the 8th diode; Described the 3rd output current-sharing circuit comprises the 5th current-sharing electric capacity, the first end of the 5th current-sharing electric capacity is connected with the first output of described the 3rd secondary winding, the second end is connected with positive pole, the 11 diode cathode of the 9th diode, and the negative pole of described the 9th diode is connected with the positive terminal of the 5th LED lamp string; The second output of described the 3rd secondary winding is connected with the tenth positive pole of diode, the negative pole of the 12 diode, and the negative pole of described the tenth diode is connected with the positive terminal of the 6th LED lamp string; The negative pole end of described the 5th, six LED lamp strings is connected with one end of the 12 diode cathode, the 5th electric capacity, one end of the 6th electric capacity; The other end of described the 5th electric capacity is connected with the negative pole of described the 9th diode; The other end of described the 6th electric capacity is connected with the negative pole of described the tenth diode; The positive pole of described the 11 diode is connected with the negative pole end of described the 4th LED lamp string.
In an embodiment of the present invention, described secondary winding and the output current-sharing circuit of connection thereof can be expanded into the output current-sharing of 2N road, and wherein, N is not less than 1 natural number.
Current-sharing output when the present invention utilizes current-sharing electric capacity to realize the different output voltage in any 2N road, has the advantages such as the simple and current-sharing of circuit is effective.
Accompanying drawing explanation
Fig. 1 is the circuit connection diagram of the embodiment of the present invention.
Fig. 2 is the circuit connection diagram of another embodiment of the present invention.
Fig. 3 is that LLC controlled resonant converter exists to Fig. 6
time conducting schematic diagram.
Fig. 7 is the equivalent electric circuit of converter work to Fig. 8.
Fig. 9 is the embodiment of the present invention four tunnel output LED driving power model machine electrical schematic diagrams.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
As shown in Figure 1, the present embodiment provides a kind of novel LED multi-path passive flow equalizing circuit, comprises LLC converter, it is characterized in that: described LLC converter has first and second secondary winding and first and second group output current-sharing circuit;
Described first group of output current-sharing circuit comprises the first current-sharing electric capacity, the first end of this first current-sharing electric capacity is connected with the first output of described the first secondary winding, the second end is connected with positive pole, the 3rd diode cathode of the first diode, and the negative pole of described the first diode is connected with the positive terminal of a LED lamp string; The second output of described the first secondary winding is connected with the negative pole of the positive pole of the second diode, the 4th diode, and the negative pole of described the second diode is connected with the positive terminal of the 2nd LED lamp string; The negative pole end of described first and second LED lamp string is connected with one end of the 3rd diode cathode, the first electric capacity, one end of the second electric capacity; The other end of described the first electric capacity is connected with the negative pole of described the first diode; The other end of described the second electric capacity is connected with the negative pole of described the second diode;
Described second group of output current-sharing circuit comprises the second current-sharing electric capacity, and the first end of this second current-sharing electric capacity is connected with the first output of described the second secondary winding, and the second end is connected with the positive pole of the 5th diode, the negative pole of the 7th diode; The negative pole of described the 5th diode is connected with the positive terminal of the 3rd LED lamp string; The second output of described the second secondary winding is connected with the negative pole of the positive pole of the 6th diode, the 8th diode; The negative pole of described the 6th diode is connected with the 4th LED lamp string positive terminal; The negative pole end of described the 3rd LED lamp string connects one the 3rd one end of current-sharing electric capacity and the positive pole of described the 4th diode; One end anodal and the 3rd electric capacity of the other end of described the 4th negative pole end of LED lamp string and the positive pole of described the 7th diode, the 8th diode cathode, the 3rd current-sharing electric capacity, the 3rd diode is connected; The other end of described the 3rd electric capacity is connected with the negative pole of described the 5th diode; One end of the 4th electric capacity is connected with the negative pole of described the 6th diode, and the other end is connected with the positive pole of described the 8th diode.
Refer to Fig. 2, in an embodiment of the present invention, also comprise the 3rd secondary winding, the 3rd group of output current-sharing circuit and the 4th current-sharing electric capacity; Described the 4th current-sharing electric capacity is located between the negative pole end of described the 4th LED lamp string and the positive pole of described the 8th diode; Described the 3rd output current-sharing circuit comprises the 5th current-sharing electric capacity, the first end of the 5th current-sharing electric capacity is connected with the first output of described the 3rd secondary winding, the second end is connected with positive pole, the 11 diode cathode of the 9th diode, and the negative pole of described the 9th diode is connected with the positive terminal of the 5th LED lamp string; The second output of described the 3rd secondary winding is connected with the tenth positive pole of diode, the negative pole of the 12 diode, and the negative pole of described the tenth diode is connected with the positive terminal of the 6th LED lamp string; The negative pole end of described the 5th, six LED lamp strings is connected with one end of the 12 diode cathode, the 5th electric capacity, one end of the 6th electric capacity; The other end of described the 5th electric capacity is connected with the negative pole of described the 9th diode; The other end of described the 6th electric capacity is connected with the negative pole of described the tenth diode; The positive pole of described the 11 diode is connected with the negative pole end of described the 4th LED lamp string.
In an embodiment of the present invention, described secondary winding and the output current-sharing circuit of connection thereof can be expanded into the output current-sharing of 2N road, and wherein, N is not less than 1 natural number.
In order to allow those skilled in the art better understand the present invention, below the operation principle of whole circuit is described further.
Refer to Fig. 1, in Fig. 1, I, II group respectively have two paths of LED lamp string, are four tunnels and export passive flow equalizing circuit.Main circuit will be comprised of 3 parts: the LLC resonance link of transformer primary side; Two two-way output circuits that adopt electric capacity current-sharing of I group and II group; An and current-sharing electric capacity that is used for balanced I group and two groups of load currents of II group.Circuit only depends on 3 electric capacity can realize the automatic current equalizing of four tunnel outputs like this.Refer to Fig. 2, current-sharing capacitor C in figure
b3be responsible for the output current-sharing of first group and second group, current-sharing capacitor C
b4be responsible for the output current-sharing of second group and the 3rd group, this passive current equalizing method also can expand to any 2N road output occasion like this.
Please continue referring in Fig. 1, this circuit can be operated under continuous mode or discontinuous mode: continuous mode refers to that the secondary diode of I group and II group constantly has and only have one group in conducting state; Discontinuous mode refers to that two groups of diode wheel conductances of secondary of I group and II group exist dead band when logical, and two groups of diodes are all in off state.
When circuit work frequency is higher than resonance frequency
time, in resonant network, only have all the time
,
and the current-sharing electric capacity of secondary participates in resonance.In a switch periods, can be divided into like this course of work in 8 stages, the present invention only analyzes 4 stages in half switch periods, and the conducting schematic diagram in each stage is if Fig. 3 is to as shown in Fig. 6.Specific works process is analyzed as follows:
Refer to Fig. 3, stage 1(
): suppose
time switching network upper pipe
parasitic capacitance both end voltage by resonance current
reverse charging arrives zero, and
now be less than 0, therefore flow through
parasitic diode, now
no-voltage can be realized open-minded; In this stage, transformer primary side winding is by load voltage clamp, therefore
do not participate in resonance and exciting current under forward voltage effect
increase gradually, and resonance current
be increase with sinusoidal form and
ratio
greatly, so rectifier diode D1, D4, D5, D8 conducting.
constantly
increase to 0, now circuit working enters the stage 2.
Refer to Fig. 4, stage 2(
):
constantly
no-voltage is open-minded.Exciting current in this stage
and resonance current
continue to increase and
>
, so rectifier diode D1, D4, D5, D8 continue to keep conducting state,
do not participate in resonance yet.
constantly,
turn-off, circuit working enters the stage 3.
Refer to Fig. 5, stage 3(
): in this stage
,
all in off state.Resonance current
give upper pipe
parasitic capacitance charging, also give lower pipe simultaneously
parasitic capacitance discharge, therefore
start to diminish gradually, still
still be greater than exciting current
, so rectifier diode D1, D4, D5, D8 continue to keep conducting state, magnetizing inductance is still by forward voltage excitation,
continue linear increase.
constantly,
=
, circuit working enters the stage 4.
Refer to Fig. 6, stage 4(
):
resonance current constantly
be less than exciting current
therefore rectifier diode D2, D3, D6, D7 start conducting.In this stage, transformer primary side winding is by load voltage clamp, and this clamping voltage is upper negative lower positive polarity, so exciting current
linearity reduce but
still be greater than
.
constantly,
the vanishing of parasitic capacitance both end voltage, circuit working enters the stage 5.
Due to the symmetry of LLC controlled resonant converter positive-negative half-cycle work, the operating state in 5～stage of stage 8 is similar to 1～stage of stage 4, no longer analyzes here.
According to producing the alternately voltage waveform of appearance of a forward voltage and negative voltage on the known transformer secondary of above-mentioned analysis winding.Suppose
-
in time, secondary winding voltage is forward voltage, as shown in Figure 7,
iin group, the circulating pathway of electric current is
, D1,
,
, D4 flows back to power supply, electric current again
give
charging, gives
electric discharge;
iIin group, the circulating pathway of electric current is
, D5,
,
, D8 flows back to again, electric current
give
charging, load
give
charging.Therefore:
（1）
-
in time, when secondary winding voltage is negative voltage, as shown in Figure 8, in I group the circulating pathway of electric current be D2,
, D3,
telegram in reply potential source, electric current
give
electric discharge; In II group the circulating pathway of electric current be D6,
, D7,
flow back to again electric current
give
electric discharge, load simultaneously
give
charging.Therefore:
（2）
Because electric capacity discharges and recharges charge balance in one-period during stable state, therefore:
（3）
The electric current of each road load is again:
（4）
By formula (4-1)-Shi (4-4), can be obtained,
Thereby have:
（5）
Be serially connected with the negative pole end of a described LED lamp string, in order to gather LED lamp string operating current; Described operating current through a voltage ratio and photoelectric isolating circuit send to a LLC control circuit, this LLC control circuit according to described voltage ratio compared with and the comparative result of photoelectric isolating circuit control the work of described LLC converter.Equally, the passive flow equalizing circuit of LED multi-path in this LED driving power can be extended to 2N road.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (2)
1. the passive flow equalizing circuit of novel LED multi-path, comprises LLC converter, it is characterized in that: described LLC converter has first and second secondary winding and first and second group output current-sharing circuit,
Described first group of output current-sharing circuit comprises the first current-sharing electric capacity, the first end of this first current-sharing electric capacity is connected with the first output of described the first secondary winding, the positive pole of the second end and the first diode, the 3rd diode cathode connects, the negative pole of described the first diode is connected with the positive terminal of a LED lamp string, the second output of described the first secondary winding and the positive pole of the second diode, the negative pole of the 4th diode connects, the negative pole of described the second diode is connected with the positive terminal of the 2nd LED lamp string, described first, the negative pole end of two LED lamp strings and the 3rd diode cathode, one end of the first electric capacity, one end of the second electric capacity connects, the other end of described the first electric capacity is connected with the negative pole of described the first diode, the other end of described the second electric capacity is connected with the negative pole of described the second diode,
Described second group of output current-sharing circuit comprises the second current-sharing electric capacity, the first end of this second current-sharing electric capacity is connected with the first output of described the second secondary winding, the positive pole of the second end and the 5th diode, the negative pole of the 7th diode connects, the negative pole of described the 5th diode is connected with the positive terminal of the 3rd LED lamp string, the second output of described the second secondary winding and the positive pole of the 6th diode, the negative pole of the 8th diode connects, the negative pole of described the 6th diode is connected with the 4th LED lamp string positive terminal, the negative pole end of described the 3rd LED lamp string connects one the 3rd one end of current-sharing electric capacity and the positive pole of described the 4th diode, described the 4th negative pole end of LED lamp string and the positive pole of described the 7th diode, the 8th diode cathode, the other end of the 3rd current-sharing electric capacity, one end of anodal and the 3rd electric capacity of the 3rd diode connects, the other end of described the 3rd electric capacity is connected with the negative pole of described the 5th diode, one end of the 4th electric capacity is connected with the negative pole of described the 6th diode, the other end is connected with the positive pole of described the 8th diode,
Also comprise the 3rd secondary winding, the 3rd group of output current-sharing circuit and the 4th current-sharing electric capacity, described the 4th current-sharing electric capacity is located between the negative pole end of described the 4th LED lamp string and the positive pole of described the 8th diode, described the 3rd group of output current-sharing circuit comprises the 5th current-sharing electric capacity, the first end of the 5th current-sharing electric capacity is connected with the first output of described the 3rd secondary winding, the positive pole of the second end and the 9th diode, the 11 diode cathode connects, the negative pole of described the 9th diode is connected with the positive terminal of the 5th LED lamp string, the second output of described the 3rd secondary winding and the positive pole of the tenth diode, the negative pole of the 12 diode connects, the negative pole of described the tenth diode is connected with the positive terminal of the 6th LED lamp string, the described the 5th, the negative pole end of six LED lamp strings and the 12 diode cathode, one end of the 5th electric capacity, one end of the 6th electric capacity connects, the other end of described the 5th electric capacity is connected with the negative pole of described the 9th diode, the other end of described the 6th electric capacity is connected with the negative pole of described the tenth diode, the positive pole of described the 11 diode is connected with the negative pole end of described the 4th LED lamp string,
Described secondary winding and the output current-sharing circuit of connection thereof can be expanded into the output current-sharing of 2N road, and wherein, N is not less than 1 natural number.
2. adopt a LED driving power for the passive flow equalizing circuit of LED multi-path claimed in claim 1, it is characterized in that: comprising: a sampling resistor, this sampling resistor is serially connected with the negative pole end of a described LED lamp string, in order to gather the operating current of LED lamp string; Described operating current through a voltage ratio and photoelectric isolating circuit send to a LLC control circuit, this LLC control circuit according to described voltage ratio compared with and the comparative result of photoelectric isolating circuit control the work of described LLC converter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106793290B (en) * | 2016-12-20 | 2018-08-17 | 福州大学 | A kind of isolated multipath flows LED drive power |
| CN106973457B (en) * | 2017-01-05 | 2018-07-17 | 福州大学 | A kind of isolated form high-power LED driving power source that multiple-channel output flows and its implementation |
| CN108055736B (en) * | 2018-01-18 | 2019-12-31 | 福州大学 | Non-isolated full-bridge LED constant current driving power supply |
| CN108235516B (en) * | 2018-01-18 | 2020-04-10 | 福州大学 | LED drive circuit with constant current and current sharing characteristics |
| CN108012385B (en) * | 2018-01-18 | 2019-12-31 | 福州大学 | Non-isolated multi-path current-sharing full-bridge LED drive circuit |
| CN109195261B (en) * | 2018-10-08 | 2020-02-14 | 广东省崧盛电源技术有限公司 | Multi-output constant current driving circuit and driving power supply |
| CN110087366B (en) * | 2019-05-25 | 2021-03-02 | 福州大学 | LED lighting Cuk-LLC three-port circuit and fuzzy prediction method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201639829U (en) * | 2010-02-24 | 2010-11-17 | 英飞特电子（杭州）有限公司 | Multi-resonance circuit applicable to multi-path LED accurate constant-current drive |
| CN102570862A (en) * | 2012-02-15 | 2012-07-11 | 杭州矽力杰半导体技术有限公司 | Current balancing circuit with multi-path output |
| CN102647823A (en) * | 2011-02-22 | 2012-08-22 | 英飞特电子（杭州）有限公司 | Constant current driving circuit for LED (Light Emitting Diode) lamp |
-
2013
- 2013-01-30 CN CN201310035539.6A patent/CN103118460B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201639829U (en) * | 2010-02-24 | 2010-11-17 | 英飞特电子（杭州）有限公司 | Multi-resonance circuit applicable to multi-path LED accurate constant-current drive |
| CN102647823A (en) * | 2011-02-22 | 2012-08-22 | 英飞特电子（杭州）有限公司 | Constant current driving circuit for LED (Light Emitting Diode) lamp |
| CN102570862A (en) * | 2012-02-15 | 2012-07-11 | 杭州矽力杰半导体技术有限公司 | Current balancing circuit with multi-path output |
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