CN103167701B - LED drive device and the method for work of series parallel structure is changed with input voltage - Google Patents
LED drive device and the method for work of series parallel structure is changed with input voltage Download PDFInfo
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Abstract
Dynamically change a LED drive device for series parallel structure with input voltage, for driving LED matrix, comprise input voltage sensing module, input voltage is compared from the different voltage ranges preset, and exports an input voltage status signal; A circuit series parallel structure control module, the control signal exporting correspondence according to input voltage status signal changes the constant-current source of total current size to switch combination and dynamic; A switch combination that can change LED matrix series parallel structure, dynamically changes the series parallel structure of LED matrix according to different control signals; A dynamic changes the constant-current source of total current size, and the total current size dynamically changing this constant-current source according to different control signals coordinates switch combination to make the electric current in unitary series of operations LED path remain on a continuous current scope.Efficiently solve the phenomenon that LED has dark space, clear zone, further reduce the stroboscopic problem of conventional ADS driving LED lamp when DC low-voltage.
Description
Technical field
The invention belongs to electronic circuit control field, particularly a kind of LED drive device and method of work changing series parallel structure with input voltage.
Background technology
LED illumination is more and more universal, there is much general LED drive chip and module in market, and the driving power of LED slowly forms the industry universal standard, often can intercommunication use between the driving power of various brands.
In order to reduce the cost of the driving power of LED, create the LED drive device of resistance-capacitance depressurization and the direct step-down of constant-current source chip two kinds of modes.The merit caused due to resistance-capacitance depressurization is because of too low, rejected by a lot of unit in the application being greater than certain wattage, therefore the regional development such as the U.S., Europe, TaiWan, China and Korea S is according to the height of input voltage or electric current and by driven LED progressively conducting and technology of progressively disconnecting stage by stage, high merit can be provided because of high efficiency LED drive power at lower cost, but there are two very large problems in this technology, first is that the LED that in fluorescent tube, ON time is short in each power supply string period of wave is just relatively darker, produces obvious dark space in fluorescent tube; Second is, segmentation conduction method only has the LED of small part light when low pressure, cause the dark space in time domain, although therefore segmentation conducting solve efficiency and merit because of problem, effectively do not solve LED stroboscopic problem.
Summary of the invention
The present invention is intended to the technical problem of dark space and time upper stroboscopic in the space that in solution prior art, LED drive device is brought, and provides a kind of LED drive device, solves LED lamp, the dark space, space especially in LED fluorescent lamp tube and time domain stroboscopic problem.
Embodiments of the invention provide a kind of LED drive device dynamically changing series parallel structure with input voltage, this LED drive device is used for driving LED matrix, described LED drive device comprises an input voltage sensing module, a circuit series parallel structure control module, a switch combination that can change the series parallel structure of LED in LED matrix and one can change the constant-current source of total current size;
Described input voltage sensing module, compares the critical value of input voltage from the different voltage ranges preset, and exports an input voltage status signal to described circuit series parallel structure control module according to comparative result;
Described circuit series parallel structure control module, exports corresponding control signal to described switch combination and the constant-current source that can change total current size according to input voltage status signal;
Described switch combination is connected to the constant-current source of described changed total current size and driven LED matrix, change the series parallel structure of switch combination according to described different control signal, the constant-current source of described changed total current size is diverted in driven LED matrix according to the series parallel structure of switch combination;
The described constant-current source changing total current size, the total current size changing this constant-current source according to described different control signal coordinates described switch combination to make the electric current in unitary series of operations LED path remain on a continuous current scope.
Further, when described input voltage sensing module detects that input voltage is positioned at minimum voltage scope, LED all in driven LED matrix drives in the mode of most multi-channel parallel by described circuit series parallel structure control module control switch matrix system;
When described input voltage sensing module detects that input voltage is positioned at ceiling voltage scope, the mode of LED all in driven LED matrix multiple series series in parallel and most with minimum road drives by the combination of described circuit series parallel structure control module control switch;
Wherein, under the control of described circuit series parallel structure control module, in described driven LED matrix, the number in parallel of LED reduces with the rising of input voltage.
Further, the total current size of the constant-current source of described changed total current size is directly proportional to the number in parallel of LED in driven LED matrix when changing and changes.
Further, described circuit series parallel structure control module controls LED conducting or the shutoff all together that described switch combination makes in described driven LED matrix under different LED strip parallel-connection structures, when conducting, the total current that the described constant-current source changing total current size provides is diverted in LED parallel pathways all in described driven LED matrix via described switch combination.
Further, described switch combination has two kinds of series parallel structures, and described predetermined voltage range is a low pressure range and a high pressure range;
When input voltage sensing module detects that input voltage is positioned at low pressure range, described circuit series parallel structure control module control switch is combined in the first series parallel structure;
When input voltage sensing module detects that input voltage is positioned at high pressure range, described circuit series parallel structure control module control switch is combined in the second series parallel structure;
Wherein, in the first series parallel structure described, the number in parallel of driven LED is the twice of the number in parallel of driven LED in described the second series parallel structure.
In order to make LED drive device of the present invention have higher power-efficient, further, described switch matrix has three kinds of series parallel structures, and described predetermined voltage range is a low pressure range, pressure scope and a high pressure range in one;
When input voltage sensing module detects that input voltage is positioned at low pressure range, described circuit series parallel structure control module control switch is combined in the first series parallel structure;
When input voltage sensing module detects that input voltage is arranged in pressure scope, described circuit series parallel structure control module control switch is combined in the second series parallel structure;
When input voltage sensing module detects that input voltage is positioned at high pressure range, described circuit series parallel structure control module control switch is combined in the third series parallel structure;
Wherein, in the first series parallel structure described, the number in parallel of driven LED is three times of the number in parallel of driven LED in the third series parallel structure described, and in described the second series parallel structure, the number in parallel of driven LED is the twice of the number in parallel of driven LED in the third series parallel structure described.
Further, the LED in described LED matrix has three kinds of series parallel structures, and described predetermined voltage range is a low pressure range, pressure scope and a high pressure range in one;
When input voltage sensing module detects that input voltage is positioned at low pressure range, described circuit series parallel structure control module control switch is combined in the first series parallel structure;
When input voltage sensing module detects that input voltage is arranged in pressure scope, described circuit series parallel structure control module control switch is combined in the second series parallel structure;
When input voltage sensing module detects that input voltage is positioned at high pressure range, described circuit series parallel structure control module control switch is combined in the third series parallel structure;
Wherein, be three times of the number in parallel of driven LED in the third series parallel structure described with forenamed three kinds of structures unlike the number in parallel of driven LED in the first series parallel structure described, in the first series parallel structure described, the number in parallel of driven LED is the twice of the number in parallel of driven LED in described the second series parallel structure.
Further, described input voltage sensing module, switch combination, the constant-current source that can change total current size and circuit series parallel structure control module are all on the same chip integrated, and described driven LED arranged in matrix is in chip exterior; Described chip is also provided with the interface for connecting outer member, according to the size of current on LED strip connection circuit single in the capable setting parameter of described outer member driven LED matrix, and adjusts the critical value of described different voltage range.
The present invention also provides a kind of above-mentioned method of work changing the LED drive device of series parallel structure with input voltage, comprises the following steps,
Step one, gather power input voltage, it is compared with the critical value of different voltage ranges preset, and exports the control signal of correspondence according to comparative result;
Step 2, according to LED all in different control signal driving LED matrixes with different series parallel structure conductings, when input voltage is positioned at minimum voltage scope, LED all in control LED matrix is with the mode conducting of most multi-channel parallel; When input voltage is positioned at ceiling voltage scope, the mode conducting of LED all in control LED matrix multiple series series in parallel and most with minimum road; Wherein, the number in parallel of described LED reduces with the rising of input voltage.
Further, in described step 2, control flow check is directly proportional to the way in parallel in LED matrix through the total current size of driven LED matrix, and the electric current flowed through in unitary series of operations LED path remains on a continuous current scope.
The above technical scheme, by comparing the critical value of input voltage from the different voltage ranges preset, and export corresponding control signal change by the series parallel structure of LED in driving LED matrix according to comparative result, and make the electric current in unitary series of operations LED path remain on a continuous current scope, achieve all LED conducting or extinguishing together in each power supply string period of wave, efficiently solve LED in fluorescent tube and have the phenomenon of dark space, clear zone in space, also the dark space on time shaft is made significantly to shorten, further reduce the stroboscopic problem of conventional ADS driving LED lamp when DC low-voltage.
Accompanying drawing explanation
Fig. 1 is the LED drive device structural representation of an embodiment of the present invention;
Fig. 2 is the current bypass path schematic diagram under the LED matrix of an embodiment of the present invention and the arrangement of gate-controlled switch and different series parallel structure;
Fig. 3 is the current bypass path schematic diagram under the LED matrix of the second embodiment of the present invention and the arrangement of gate-controlled switch and different series parallel structure;
Fig. 4 is the current bypass path schematic diagram under the LED matrix of the third embodiment of the present invention and the arrangement of gate-controlled switch and different series parallel structure;
Fig. 5 is the method for work flow chart of the LED drive device of an embodiment of the present invention.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
According to Fig. 1, the invention provides a kind of LED drive device dynamically changing series parallel structure with input voltage, described LED drive device is used for driving LED matrix 40, described LED drive device comprises an input voltage sensing module 10, a circuit series parallel structure control module 20, dynamic changes the constant-current source 30 of total current size, and dynamic changes the switch combination 50 of the series parallel structure of LED in LED matrix 40;
Described LED matrix 40 has high-pressure side and low-pressure end, the high-pressure side of LED matrix 40 and low-pressure end and between formed can the multiple branch road with different LED series parallel structure of ON operation, such as, all LED in described LED matrix 40 can connect the single tandem paths of formation one mutually, or all LED in LED matrix 40 can the path of all LED parallel forms of formation parallel with one another;
Described input voltage sensing module 10, for monitoring the input voltage of power supply, and the critical value of input voltage from the different voltage ranges preset compared, and export an input voltage status signal to described circuit series parallel structure control module 20 according to comparative result.The critical value of the described here different voltage ranges preset can set in advance according to the input voltage of power supply, such as, is arranged to the low pressure range of 0 ~ 110Vac and the high pressure range of 110Vac ~ 220Vac; If light fixture will be made for American market, so the critical value of LED number and voltage range will be changed into the numerical value of the input voltage range of the 110Vac that can adapt to the U.S..
Described circuit series parallel structure control module 20, for receiving described input voltage status signal, and exports corresponding control signal to described switch combination 50 and the constant-current source 30 that can change total current size according to described input voltage status signal;
Described switch combination 50, be connected to the constant-current source 30 and driven LED matrix 40 that can change total current size, switch combination 50 dynamically changes series parallel structure according to described different control signal, again that each tandem paths is in parallel after allowing the part LED in driven LED matrix 40 first connect, concrete series connection number and number in parallel can pre-set configuration by driving LED matrix and control signal according to country variant supply voltage specification, when circuit is integrated in chip, the critical value of setting interface adjustment voltage range can be reserved.
Electric current on unitary series of operations path is multiplied by the total wattage of forward conducting voltage with regard to being approximately LED matrix of total LED number and LED, stable brightness is kept in space and in time in order to make every LEDs, fixing constant current state will be kept to the drive current of each LEDs, namely constant-current source 30 dynamically changes its total current size in company with the control signal that switch combination 50 is corresponding according to different voltage range together, the electric current in unitary series of operations LED path is made to keep fixing, because driven LED first connects after bunchiness more each tandem paths to be carried out parallel connection, the described total current value changing the constant-current source 30 of total current size can be directly proportional to way in parallel and change, but the proportionate relationship and the theory that are difficult to guarantee change when making hardware are just the same, as long as it is all right therefore the electric current in unitary series of operations LED path to be allowed to remain within the scope of a certain continuous current, this scope is less, and the flicker in the hot spot that bright dark space is caused and time domain is less.
Further, when described input voltage sensing module 10 monitor input voltage be positioned at lower predetermined voltage range time, LED all in driven LED matrix 40 drives to described circuit series parallel structure control module control switch combination 50 by the described input voltage status signal exported in the mode compared with multi-channel parallel, be namely energized work; When described input voltage sensing module 10 detect input voltage be positioned at higher predetermined voltage range time, LED all in driven LED matrix drives to described circuit series parallel structure control module control switch combination 50 by the described input voltage status signal of output in the mode of less road parallel connection; When described input voltage sensing module detects that input voltage is positioned at minimum voltage scope, LED all in driven LED matrix drives in the mode of most multi-channel parallel by described circuit series parallel structure control module control switch combination 50; When described input voltage sensing module detects that input voltage is positioned at ceiling voltage scope, the mode of LED all in driven LED matrix 40 multiple series series in parallel and most with minimum road drives by described circuit series parallel structure control module control switch combination 50; Wherein, under the control of described circuit series parallel structure control module, in described driven LED matrix 40, the number in parallel of LED reduces with the rising of input voltage.
In above technical scheme, remain within the scope of a certain continuous current in order to the electric current on series LED path single in LED matrix 40 can be made, the number in parallel of LED is directly proportional change when the series parallel structure of total current size all LED in LED matrix 40 of the constant-current source of described changed total current size changes and in LED matrix 40, therefore makes electric current can be maintained in a fixing scope by the single LED strip current value joined in path that described switch combination 50 is diverted to each parallel connection.Simultaneously described circuit series parallel structure control module 20 controls LED conducting or the shutoff all together that described switch combination makes in described LED matrix 40 under different LED strip parallel-connection structures, when conducting, the total current that the described constant-current source changing total current size provides is diverted in LED parallel pathways all in described driven LED matrix 40 via described switch combination.
Closer, on the same chip, described driven LED matrix 40 is arranged on chip exterior for described input voltage sensing module 10, switch combination 50, the constant-current source 30 that can change total current size and circuit series parallel structure control module 20 accessible site; Described chip is also provided with and obtains interface for connecting outer member, according to the parameter of described outer member, can set the size of current on single LED strip connection circuit, and adjust the critical value of described different voltage range by described interface.
For example, a non-essential resistance can be utilized to adjust the electric current on single LED strip connection path, adjust the critical value of different voltage range with other resistance.Illustrate with Chinese supply voltage, if LED lamp is excessively dark when being afraid of supply voltage abnormal step-down, so adjust critical value time not necessarily completely the proportional segmentation of input supply voltage scope of standard, the LED number on tandem paths can be reduced, and all voltage range critical values reduce together; If but lie in very much the power-efficient of normal input supply voltage scope, do not mind the abnormal step-down of supply voltage, so just can increase the number of LED and heighten the critical value of each voltage range.
By by embodiment, the LED drive device with input voltage change series parallel structure of the present invention and operation principle thereof are further detailed below.
The first embodiment:
Shown in composition graphs 2, described LED matrix 40 is provided with two LED strip between its high-pressure side and low-pressure end, suppose that this is the circuit in order to city's electrical specification of China does, the forward conducting voltage of the white light LEDs of current industry is about 3.0V to 3.6V, so LED strip 53 and each 39 LEDs series connection naturally of LED strip 57, it is series connection 78 LEDs altogether that two string LED add up, so forward conducting voltage is about 234Vdc to 302Vdc, 220Vac is through the nearly 310Vdc of heap that passes a bridge, directly can promote this 78 LEDs, and there is enough voltage to carry out stable constant-current source electric current, if worry that AC supply voltage is unstable, during AC supply voltage peak value step-down, LED is bright not, so unitary series of operations number can be reduced to 36 ~ 38 by 39 series connection, brightness can become stable, but the pressure drop of electric current on constant-current source can increase, this pressure drop is not luminous on LED, but generate heat on constant-current source, because this reducing power-efficient.Two LED strip of illustrating in Fig. 2 are serially connected with 39 LEDs respectively, and when general supply voltage peak value reduces, brightness can be slightly dimmed, but can't extinguish completely.
Simultaneously, suppose that described predetermined voltage range is a low pressure range and a high pressure range, when power input voltage drops on low pressure range, the input voltage status signal that described input voltage sensing module 10 exports controls LED all in described LED matrix 40 with more way conducting in parallel to described circuit series parallel structure control module 20, namely in Fig. 2, LED in described circuit series parallel structure control module 20 control LED matrix 40 drives in the mode of two-way parallel connection, gate-controlled switch 55 is off state, gate-controlled switch 52, 54, 56 and 58 is closure state, first LED branch current in two-way parallel connection represents with single dotted broken line, gate-controlled switch 52 is flowed through by high-pressure side, LED strip 53 and gate-controlled switch 54 are to low-pressure end, second LED branch current in two-way parallel connection also represents with single dotted broken line, gate-controlled switch 56 is flowed through by high-pressure side, LED strip 57 and gate-controlled switch 58 are to low-pressure end.
When power input voltage drops on high pressure range, the input voltage status signal that described input voltage sensing module 10 exports controls LED all in described LED matrix 40 with less way conducting in parallel to described circuit series parallel structure control module 20, namely in Fig. 2, LED in described circuit series parallel structure control module 20 control LED matrix 40 drives in the mode of a road parallel connection, now, gate-controlled switch 55 becomes closure state, gate-controlled switch 54 and 56 becomes open-circuit condition, electric current in this LED branch road is represented by dotted lines, gate-controlled switch 52 is flowed through by high-pressure side, LED strip 53, gate-controlled switch 55, LED strip 57 and gate-controlled switch 58 are to low-pressure end, wherein gate-controlled switch 52 and gate-controlled switch 58 are the state of conducting always, if this drive circuit does not need can to change with other multi-segment voltage scope frameworks, configuration shares, so switch 52 and switch 58 do not need to make gate-controlled switch, directly make guiding path all right, although therefore denote numeral in fig. 2, but be directly drawn as the guiding path of closure state, cost can be saved.
In the above control procedure, no matter form what kind of LED branch road path between the high-pressure side of LED matrix 40 and low-pressure end, the operating current that current source 30 is supplied to each LED strip is identical, in other words, the size of total current that described current source exports is directly proportional to the way in parallel of LED strip and changes, therefore when LED strip 53 and LED strip 57 are parallel connections, total output current of current source is the twice of total output current when LED strip 53 and 57 is connected, when producing light fixture, LED strip 53 and LED strip 57 to be matched, both allowing, forward conducting voltage is consistent as far as possible, this operation can make current source when two LED strip parallel operations, shunt consistent to the electric current of each LED branch road, current balance type when series resistance can strengthen parallel connection is added in LED strip 53 and 57, but this series resistance will reduce power-efficient, if constant-current source is splitted into two parts, a constant-current source is respectively put in LED strip 53 and 57, still above-mentioned patent working method is met, but can cost be increased, and connect time constant-current source is not of uniform size cause time can reduce power-efficient.
The second embodiment:
Fig. 3 is the current bypass path under the LED matrix of the second embodiment of the present invention and the arrangement schematic diagram of gate-controlled switch and different series parallel structure; Shown in composition graphs 3, Fig. 3 is the example that can form three kinds of LED strip parallel combinations in a LED matrix 40, predetermined voltage range is divided into three sections of voltage ranges, low pressure range, middle pressure scope and high pressure range respectively, compared with the first embodiment, the present embodiment can reduce the power loss that causes across the voltage on constant-current source 30 to improve the overall efficiency of circuit, can also shorten temporal dark space at lower input supply voltage shorting advance LED.In described LED matrix 40, series-parallel switch combination and six LED strip are had between high-pressure side and low-pressure end, we are still to illustrate in implementation of China, suppose that each LED strip is serially connected with 13 LEDs respectively, a LED strip is 13 LEDs, two LED strip are 26 LEDs, three LED strip 39, by that analogy, the longest LED strip is when the six string LED strip situations of connecting on single road, LED strip connection sum is 78, if worry that supply voltage is unstable, during AC supply voltage peak value step-down, LED is bright not, so the LED strip of each LED strip connection number can be reduced to 12 by 13 series connection, brightness can be more relatively stable.
When the input supply voltage that input voltage sensing module 10 detects is positioned at low pressure range, output-input voltage status signal gives described circuit series parallel structure control module 20 control switch combination 50 by LED all in described LED matrix 40 with the mode conducting of three tunnel parallel connections, i.e. gate-controlled switch 640 in figure 3, 650, 654 and 660 are off state, gate-controlled switch 610, 612, 620, 652, 622, 630 and 632 is closure state, first LED branch current in three road parallel connection LEDs is represented by dotted lines, gate-controlled switch 610 is flowed through by high-pressure side, 26 LEDs of two LED strip serial connections arrive low-pressure end through gate-controlled switch 612 again, second LED branch current in three tunnel parallel connections is also represented by dotted lines, flow through through gate-controlled switch 620 13 LEDs that a LED strip forms by high-pressure side, again through gate-controlled switch 652, then through 13 LEDs that another LED strip forms, then through gate-controlled switch 622 to low-pressure end, the 3rd LED branch current in three tunnel parallel connections is also represented by dotted lines, and is flowed through 26 LEDs of gate-controlled switch 630, two LED strip serial connections by high-pressure side, then through gate-controlled switch 632 to low-pressure end.
When the input supply voltage that input voltage sensing module 10 detects is arranged in pressure scope, output-input voltage status signal gives described circuit series parallel structure control module 20 control switch combination 50 by LED all in described LED matrix 40 with the mode conducting of two-way parallel connection, i.e. gate-controlled switch 612, 620, 622, 630 and 652 are off state, gate-controlled switch 610, 650, 660, 640, 654 and 632 is closure state, first LED branch current in two-way parallel connection represents with single dotted broken line, by high-pressure side flow through gate-controlled switch 610 then through 26 LEDs again through gate-controlled switch 650, again through 13 LEDs, finally by gate-controlled switch 660 to low-pressure end, second LED branch current in two-way parallel connection also represents with single dotted broken line, by high-pressure side flow through gate-controlled switch 640 then through 13 LEDs again through gate-controlled switch 654, then through 26 LEDs, finally by gate-controlled switch 632 to low-pressure end.
When the input supply voltage that input voltage sensing module 10 detects is positioned at high pressure range, output-input voltage status signal gives described circuit series parallel structure control module 20 control switch combination 50 by LED all in described LED matrix 40 with the mode conducting of a road parallel connection, gate-controlled switch 612, 620, 640, 630, 660 and 622 are off state, gate-controlled switch 610, 650, 652, 654 and 632 is closure state, the electric current of all LED of single channel conducting represents with double dot dash line, by high-pressure side flow through gate-controlled switch 610 then through 26 LEDs again through gate-controlled switch 650, again through 13 LEDs, again through gate-controlled switch 652 then through 13 LEDs again through gate-controlled switch 654, again through 26 LEDs, finally by gate-controlled switch 632 to low voltage rail.
In above-described three kinds of series parallel structure modes, no matter which kind of series parallel structure mode, described circuit series parallel structure control module 20 all controls constant-current source 30 provides same size operating current to the single LED strip in described LED matrix 40, therefore, in the present embodiment, the total current size that constant-current source 30 exports also is directly proportional to the way in parallel of LED strip and changes, three times when the total current of the constant-current source 30 when three paths of LEDs string footpaths are in parallel is paths of LEDs connection in series-parallel, the twice when total current of the constant-current source 30 time in parallel in two paths of LED string footpath is paths of LEDs string footpath parallel connections, so no matter Shi Ji road is in parallel, electric current in single LED strip is all maintain an identical definite value.
The third embodiment:
Fig. 4 is the current bypass path under the LED matrix of the third embodiment of the present invention and the arrangement schematic diagram of gate-controlled switch and different series parallel structure, shown in composition graphs 4, Fig. 4 is the example that can form three kinds of LED strip parallel-connection structure combinations in another kind of LED matrix 40, in Fig. 3, the series LED number of three kinds of structures of the second embodiment is 26 respectively, 39 and 78, corresponding conducting voltage ratio is 2:3:6, therefore low pressure conducting is interval, middle pressure conducting is interval, the voltage range percentages in high voltage conduction interval is roughly 2:(3-2): (6-3)=2:1:3, although design so is more excellent than the first embodiment, but make constant-current source 30 can different height in the efficiency of different voltage range, in order to further optimization efficiency, take new series connection number ratio, the number of three kinds of series connection is 26 respectively, 52 and 78, so, the ratio of three sections of voltage ranges has been exactly 1:1:1, constant-current source 30 is equally high in the efficiency of each voltage range, overall power-efficient can be promoted.
Series-parallel switch combination and six LED strip are had between the high-pressure side of LED matrix 40 and low-pressure end in Fig. 4, we suppose that each LED strip is serially connected with 26 LEDs respectively, a string have 26, and two strings have 52, and three strings just have 78, and previous embodiments, if puzzlement worries that supply voltage is unstable, when maximum mains voltage step-down, LED is bright not, and number of so single-string LED can being connected reduces to 25 or 24 series connection by 26 series connection, brightness can be stablized, but can lose efficiency.
Predetermined voltage range in Fig. 4 embodiment is also divided into three sections of voltage ranges, is low pressure range, middle pressure scope and high pressure range respectively.When the input supply voltage that input voltage sensing module 10 detects is positioned at low pressure range, output-input voltage status signal controls LED all in described LED matrix 40 with the mode conducting of six tunnel parallel connections to described circuit series parallel structure control module 20, controlling corresponding gate-controlled switch makes the electric current in LED matrix 40 flow by the direction of dotted line, first LED branch current by high-pressure side 700 flow through LED strip 710 again through a gate-controlled switch first flowed through by high-pressure side 700 with second LED branch current LED strip 712 in parallel after flow to low-pressure end through a gate-controlled switch again, in like manner the 3rd LED branch current by high-pressure side 700 flow through LED strip 720 again through a gate-controlled switch first flowed through by high-pressure side 700 with the 4th LED branch current LED strip 722 in parallel after flow to low-pressure end through a gate-controlled switch again, in like manner the 5th LED branch current by high-pressure side 700 flow through LED strip 730 again through a gate-controlled switch first flowed through by high-pressure side 700 with the 6th LED branch current LED strip 732 in parallel after flow to low-pressure end through a gate-controlled switch again, because the control principle of gate-controlled switch is identical with previous embodiment, just gate-controlled switch closes different from the combination disconnected, therefore in the present embodiment, the control details of gate-controlled switch is not described in detail.
When the input supply voltage that input voltage sensing module 10 detects is arranged in pressure scope, output-input voltage status signal controls LED all in described LED matrix 40 with the mode conducting of three tunnel parallel connections to described circuit series parallel structure control module 20, under this kind of control mode, circuit series parallel structure control module 20 controls corresponding gate-controlled switch makes the electric current in LED matrix 40 flow by the direction of single dotted broken line, first LED branch current flows through tandem paths that LED strip 710 and LED strip 720 formed to low-pressure end by high-pressure side, second LED branch current flows through tandem paths that LED strip 712 and LED strip 730 formed to low-pressure end by high-pressure side, 3rd LED branch current flows through tandem paths that LED strip 722 and LED strip 732 formed to low-pressure end by high-pressure side.
When the input supply voltage that input voltage sensing module 10 detects is positioned at high pressure range, output-input voltage status signal controls LED all in described LED matrix 40 with the mode conducting of two-way parallel connection to described circuit series parallel structure control module 20, under this kind of control mode, circuit series parallel structure control mould 20 controls corresponding gate-controlled switch makes the electric current in LED matrix 40 flow by the direction of double dot dash line, first LED branch current flows through LED strip 710 by high-pressure side, LED strip 720, low-pressure end is flow to behind the path that LED strip 730 series connection is formed, second LED branch current flows through LED strip 712 by high-pressure side, LED strip 722, low-pressure end is flow to behind the path that LED strip 732 series connection is formed.
In above-described three kinds of control modes, no matter which kind of control mode, described control module 20 all controls current source 30 and provides same operating current to the LED strip in described LED matrix 40, therefore, in the present embodiment, the total current size that current source 30 exports also is directly proportional to the way in parallel of LED strip and changes, therefore three times when when six paths of LEDs connection in series-parallel, the total current of current source is two paths of LED connection in series-parallel, twice when current source total current when six paths of LEDs connection in series-parallel is three paths of LEDs connection in series-parallel, so no matter Shi Ji road is in parallel, electric current in single LED strip is all maintain definite value, and voltage range is all be a scope with 26 LEDs, therefore best balanced constant-current source efficiency is obtained, and then obtain preferably overall power-efficient, but the number of gate-controlled switch is more than the second embodiment, add some costs.
Above-described the second embodiment and the third embodiment, compared with the first embodiment, be divided into three sections of voltage ranges and can improve power-efficient and power factor, but increase number of switches can improve hardware cost, when the mode of voltage range two-part cannot reach power-efficient and the power factor of customer demand, it is the mode of 3:2:1 that the meeting of intuition develops the first number in parallel above, but the LED strip in the upper limit of each supply voltage scope and this scope joins number roughly direct ratio, i.e. 2:3:6, namely first paragraph scope: second segment scope: three segment limit=2:(3-2): (6-3)=2:1:3, the distribution of this supply voltage scope is also uneven, therefore under being ready to spend more slightly again the prerequisite of some costs, number ratio in parallel in the second three scopes just can be adopted to be the mode of 6:3:2, the series connection number ratio of its correspondence is 2:4:6, namely first paragraph scope: second segment scope: three segment limit=2:(4-2): (6-4)=2:2:2, distributing very evenly of this supply voltage scope.
The switch cost paying above-mentioned increase obtains uniform voltage range, can reduce maximum pressure drop above constant-current source and total heating, and provide higher merit because of and higher power-efficient.
The present invention also provides a kind of above-mentioned method of work changing the LED drive device of series parallel structure with input voltage, comprises the following steps,
Step one, gather power input voltage, it is compared with the critical value of different voltage ranges preset, and exports the control signal of correspondence according to comparative result;
Step 2, according to LED all in different control signal driving LED matrixes 40 with different series parallel structure conductings, when input voltage is positioned at minimum voltage scope, LED all in control LED matrix 40 is with the mode conducting of most multi-channel parallel; When input voltage is positioned at ceiling voltage scope, the mode conducting of LED all in control LED matrix multiple series series in parallel and most with minimum road; Wherein, the number in parallel of described LED reduces with the rising of input voltage.
Further, in described step 2, control flow check is directly proportional to the way in parallel in LED matrix through the total current size of driven LED matrix, and the electric current flowed through in unitary series of operations LED path remains on a continuous current scope.
The LED drive circuit that above embodiment of the present invention provides, (such as 5 watts) usefulness of large merit because of (such as merit is because being greater than 0.8) can be realized more than certain specific wattage, the efficiency of this LED drive power effectively improves simultaneously, and all LED are conducting or extinguish together together in each power supply string period of wave, the difference of dark space, clear zone is not had in fluorescent tube, solve high merit because of, the problem of High-efficiency LED driver circuit, and due to the LED all when low pressure be conducting together, dark space on time shaft is significantly shortened, further reduce conventional ADS driving causes LED lamp stroboscopic problem when DC low-voltage.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. one kind changes the LED drive device of series parallel structure with input voltage, described LED drive device is used for driving LED matrix, it is characterized in that: described LED drive device comprises an input voltage sensing module, a circuit series parallel structure control module, a switch combination that can change the series parallel structure of LED in LED matrix and one can change the constant-current source of total current size;
Described input voltage sensing module, compares the critical value of input voltage from the different voltage ranges preset, and exports an input voltage status signal to described circuit series parallel structure control module according to comparative result;
Described circuit series parallel structure control module, exports corresponding control signal to described switch combination and the constant-current source that can change total current size according to input voltage status signal;
Described switch combination is connected to the constant-current source of described changed total current size and driven LED matrix, change the series parallel structure of switch combination according to described different control signal, the constant-current source of described changed total current size is diverted in driven LED matrix according to the series parallel structure of switch combination;
The described constant-current source changing total current size, the total current size changing this constant-current source according to described different control signal coordinates described switch combination to make the electric current in unitary series of operations LED path remain on a continuous current scope;
When described input voltage sensing module detects that input voltage is positioned at minimum voltage scope, LED all in driven LED matrix drives in the mode of most multi-channel parallel by the switch combination described in described circuit series parallel structure control module controls;
When described input voltage sensing module detects that input voltage is positioned at ceiling voltage scope, the mode of LED all in driven LED matrix multiple series series in parallel and most with minimum road drives by the switch combination described in described circuit series parallel structure control module controls;
Wherein, under the control of described circuit series parallel structure control module, the number in parallel of described switch combination reduces with the rising of input voltage, and the total current size of the constant-current source of described changed total current size is directly proportional to the number in parallel of LED in driven LED matrix when changing and changes.
2. a kind ofly as claimed in claim 1 change the LED drive device of series parallel structure with input voltage, it is characterized in that: described circuit series parallel structure control module controls LED conducting or the shutoff all together that described switch combination makes in described driven LED matrix under different LED strip parallel-connection structures, when conducting, the total current that the described constant-current source changing total current size provides is diverted in LED parallel pathways all in described LED matrix via described switch combination.
3. a kind ofly as claimed in claim 2 change the LED drive device of series parallel structure with input voltage, it is characterized in that: described switch combination has two kinds of series parallel structures, described predetermined voltage range is a low pressure range and a high pressure range;
When input voltage sensing module detects that input voltage is positioned at low pressure range, described circuit series parallel structure control module control switch is combined in the first series parallel structure;
When input voltage sensing module detects that input voltage is positioned at high pressure range, described circuit series parallel structure control module control switch is combined in the second series parallel structure;
Wherein, in the first series parallel structure described, the number in parallel of driven LED is the twice of the number in parallel of driven LED in described the second series parallel structure.
4. a kind ofly as claimed in claim 2 change the LED drive device of series parallel structure with input voltage, it is characterized in that: described switch matrix has three kinds of series parallel structures, described predetermined voltage range be a low pressure range, pressure scope and a high pressure range in one;
When input voltage sensing module detects that input voltage is positioned at low pressure range, described circuit series parallel structure control module control switch is combined in the first series parallel structure;
When input voltage sensing module detects that input voltage is arranged in pressure scope, described circuit series parallel structure control module control switch is combined in the second series parallel structure;
When input voltage sensing module detects that input voltage is positioned at high pressure range, described circuit series parallel structure control module control switch is combined in the third series parallel structure;
Wherein, in the first series parallel structure described, the number in parallel of driven LED is three times of the number in parallel of driven LED in the third series parallel structure described, and in described the second series parallel structure, the number in parallel of driven LED is the twice of the number in parallel of driven LED in the third series parallel structure described.
5. a kind ofly as claimed in claim 2 change the LED drive device of series parallel structure with input voltage, it is characterized in that: the LED in described LED matrix has three kinds of series parallel structures, described predetermined voltage range be a low pressure range, pressure scope and a high pressure range in one;
When input voltage sensing module detects that input voltage is positioned at low pressure range, described circuit series parallel structure control module control switch is combined in the first series parallel structure;
When input voltage sensing module detects that input voltage is arranged in pressure scope, described circuit series parallel structure control module control switch is combined in the second series parallel structure;
When input voltage sensing module detects that input voltage is positioned at high pressure range, described circuit series parallel structure control module control switch is combined in the third series parallel structure;
Wherein, in the first series parallel structure described, the number in parallel of driven LED is three times of the number in parallel of driven LED in the third series parallel structure described, and in the first series parallel structure described, the number in parallel of driven LED is the twice of the number in parallel of driven LED in described the second series parallel structure.
6. a kind of LED drive device changing series parallel structure with input voltage as described in above-mentioned any one claim, it is characterized in that: described input voltage sensing module, switch combination, the constant-current source that can change total current size and circuit series parallel structure control module are all on the same chip integrated, described driven LED arranged in matrix is in chip exterior; Described chip is also provided with the interface for connecting outer member, according to the size of current on LED strip connection circuit single in the setting parameter of described outer member driven LED matrix, and adjusts the critical value of described different voltage range.
7. change a method of work for the LED drive device of series parallel structure with input voltage, described LED drive device is used for driving LED matrix, it is characterized in that: comprise the following steps,
Step one, gather power input voltage, it is compared with the critical value of different voltage ranges preset, and exports the control signal of correspondence according to comparative result;
Step 2, according to LED all in different control signal driving LED matrixes with different series parallel structure conductings, when input voltage is positioned at minimum voltage scope, LED all in control LED matrix is with the mode conducting of most multi-channel parallel; When input voltage is positioned at ceiling voltage scope, the mode conducting of LED all in control LED matrix multiple series series in parallel and most with minimum road; Wherein, the number in parallel of described LED reduces with the rising of input voltage;
In described step 2, control flow check is directly proportional to the way in parallel in LED matrix through the total current size of driven LED matrix, and the electric current flowed through in unitary series of operations LED path remains on a continuous current scope.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103533709A (en) * | 2013-10-08 | 2014-01-22 | 吕大明 | LED (light-emitting diode) filament stable-power combination driver |
| CN103648205A (en) * | 2013-11-11 | 2014-03-19 | 吕大明 | HVLED steady-light wide-voltage driver |
| CN103889111B (en) * | 2014-02-28 | 2016-07-27 | 上海路千电子科技有限公司 | The linear constant current drive circuit of a kind of twin voltage operation and driving method thereof |
| CN104703349B (en) * | 2015-03-06 | 2018-01-19 | 上海顿格电子贸易有限公司 | A kind of current constant control LED information display system |
| CN105282929B (en) * | 2015-10-20 | 2018-04-27 | 晨辉光宝科技有限公司 | A kind of full voltage piece-wise linear constant current LED drive circuit of automatic switchover mode |
| CN205946265U (en) * | 2016-08-16 | 2017-02-08 | 深圳市明微电子股份有限公司 | Linear constant -current drive circuit of full voltage LED |
| CN107453747B (en) * | 2017-07-27 | 2020-11-03 | 宁波大学 | Method for realizing multi-path analog switch by potentiometer for single chip microcomputer with AD converter |
| CN107567133B (en) * | 2017-08-30 | 2019-06-04 | 上海亚明照明有限公司 | Work in the LED constant current control device under a variety of line voltages |
| CN110062490A (en) * | 2018-01-18 | 2019-07-26 | 朗德万斯公司 | LED light for the series driver of LED light and for being placed in florescent lamp fitting |
| CN108966432A (en) * | 2018-09-14 | 2018-12-07 | 贵州大学 | A kind of LED linear constant-current drive circuit of adaptive wide-voltage range |
| CN111511058B (en) * | 2020-03-17 | 2022-03-15 | 上海润廷电子科技有限公司 | Dynamic regulation and control method of matrix type LED lamp light and matrix type LED lamp applied by dynamic regulation and control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101827481A (en) * | 2009-09-29 | 2010-09-08 | 李云霄 | Alternating-current power supply LED light source drive circuit with segmented conversion input |
| CN102243854A (en) * | 2011-08-18 | 2011-11-16 | 深圳市华星光电技术有限公司 | LED (light emitting diode) backlight driving method, liquid crystal display device and LED backlight driving circuit |
| CN102711319A (en) * | 2012-05-03 | 2012-10-03 | 李云霄 | LED (light emitting diode) light source subregion subsection transformation input driving control method and control circuit thereof |
| CN203251462U (en) * | 2013-04-01 | 2013-10-23 | 黄世蔚 | LED drive device capable of changing series-parallel composition along input voltage |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201233244A (en) * | 2011-01-31 | 2012-08-01 | Luxul Technology Inc | High brightness LED driving circuit |
-
2013
- 2013-04-01 CN CN201310110690.1A patent/CN103167701B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101827481A (en) * | 2009-09-29 | 2010-09-08 | 李云霄 | Alternating-current power supply LED light source drive circuit with segmented conversion input |
| CN102243854A (en) * | 2011-08-18 | 2011-11-16 | 深圳市华星光电技术有限公司 | LED (light emitting diode) backlight driving method, liquid crystal display device and LED backlight driving circuit |
| CN102711319A (en) * | 2012-05-03 | 2012-10-03 | 李云霄 | LED (light emitting diode) light source subregion subsection transformation input driving control method and control circuit thereof |
| CN203251462U (en) * | 2013-04-01 | 2013-10-23 | 黄世蔚 | LED drive device capable of changing series-parallel composition along input voltage |
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