CN103269551B - A kind of multisection type cascade drive circuit - Google Patents
A kind of multisection type cascade drive circuit Download PDFInfo
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Abstract
The invention provides a kind of multisection type cascade drive circuit, comprising: power module; Multiple control module, is connected in turn on the outlet line of power module; Multiple load blocks, is connected on the outlet line of power module successively, and correspondingly with multiple control module connects, by the control module controlling run of correspondence; Multiple switch module, is connected between corresponding control module and load blocks, by the operation of the order control load module of control module; The output of last control module be connected on the outlet line of power module is connected with steady resistance; Described switch module is made up of metal-oxide-semiconductor field effect transistor, and described load blocks is made up of light-emitting diode; Current-limiting resistance is connected with between described power module and each metal-oxide-semiconductor field effect transistor; The order that multiple control module is connected on outlet line is contrary with the corresponding order of multiple load blocks on outlet line controlled.The present invention can improve efficiency and the power factor of power supply.
Description
Technical field
The present invention relates to LED drive circuit technical field, be specially a kind of multisection type cascade drive circuit.
Background technology
Light-emitting diode (Light Emitting Diode is called for short LED) is a kind of mat applied voltage excitation electron and radiates the optoelectronic semiconductor component of bright dipping, has the advantages such as low in energy consumption, brightness is high, the life-span is long, size is little.The previous typical high light flux LED component of order can produce the luminous flux of a few lumen to tens of lumen.The design upgraded can be adopt multiple LED strip and cascading, namely in single assembly, multiple device is installed, also can in a device integrated more LED, thus make the lumen number of output be equivalent to miniature incandescent lamps.Such as, high-power 12 chip monochromatic LED devices can export the light energy of 200 lumens, and the power consumed is between 10 to 15 watts.LED has been widely used in various lighting apparatus, as battery powered photoflash lamp, miniature acoustic control lamp, safety flare, indoor and outdoor road and stair illuminating lamp and building and mark continuous illumination lamp.But, drive multiple LED strip and cascading time, because drive condition is different, to the operation of LED group, control and maintenance bring inconvenience.
The drive circuit of present LED is very different, have in order to reduce costs, it is very simple that circuit does, power factor only accomplishes about 0.5, luminous efficiency is very low, cannot to meet on market efficient demand of saving product, have in order to pursue high performance requirements, circuit is very complicated, use the restricted devices such as a large amount of electrochemical capacitors and inductance, cost improves greatly, and the circuit of different product is not identical yet, and the development difficulty of circuit is also larger, add the development time, due to complex circuit, the volume of product is relatively large, affects the global design of light fixture product.So simplicity of design, high performance power supply is very important.
As shown in Figure 1, the general topology that present LED linear drives is shown as.Comprise power module 11', control module 12', comprise the switch module 14' etc. of the load blocks 13' of some LED and some switches.Such as, as shown in Figure 1, its drived control mode is: when reaching the voltage of first paragraph LED D1, switch Q1 opens ground connection, make LED D1 conducting over the ground, when reaching the voltage of second segment LED D2, switch Q1 disconnects, switch Q2 opens ground connection, make LED D1 and LED D2 conducting over the ground, when reaching the voltage of the 3rd section of LED D3, switch Q1, switch Q2 disconnects, switch Q3 opens ground connection, make LED D1, LED D2 and LED D3 conducting over the ground, when reaching the voltage of the 4th section of LED D4, switch Q1, switch Q2 and switch Q3 disconnects, switch Q4 opens ground connection, make LED D1, LED D2, LED D3 and LED D4 conducting over the ground simultaneously.
By this control mode, can improve efficiency and the power factor of power supply, power-efficient can accomplish 0.88, and power factor is greater than 0.95, THD(Total Harmonic Distortion, total harmonic distortion) be less than 20%.
The current main expansion mode driven above-mentioned LED linear as shown in Figure 2, is mainly control module 12' part simple in parallel, is equivalent to have 1 ~ n control module 12' in parallel, the LED corresponding to driving respectively separately.Because the power-efficient of the linear drive circuit of present LED, the major parameter such as power factor and THD are determined by drived control, all determine if drive control part selectes the power-efficient of its whole circuit, power factor and THD, due to its expansion mode shown in Fig. 2, to be mainly drive control part simply in parallel, and circuit parameter can not change.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of multisection type cascade drive circuit, for improving efficiency and the power factor of power supply in prior art.
For achieving the above object and other relevant objects, the invention provides a kind of multisection type cascade drive circuit, comprising: power module; Multiple control module, is connected in turn on the outlet line of power module; Multiple load blocks, is connected on the outlet line of power module successively, and correspondingly with multiple control module connects, by the control module controlling run of correspondence; Multiple switch module, is connected between corresponding control module and load blocks, by the operation of the order control load module of control module.
Preferably, one end of described control module is connected on the outlet line of power module, and the other end is connected with one end of switch module; One end of described load blocks is connected on outlet line, and the other end is connected with other one end of described switch module.
Preferably, the output of last control module be connected on the outlet line of power module is connected with steady resistance.
Preferably, described switch module is made up of metal-oxide-semiconductor field effect transistor, and described load blocks is made up of light-emitting diode.
Preferably, current-limiting resistance is connected with between described power module and each metal-oxide-semiconductor field effect transistor.
Preferably, the order that is connected on outlet line of multiple control module is contrary with the corresponding order of multiple load blocks on outlet line controlled.
Preferably, switch module introduces the control module corresponding to this switch module through control module above successively.
Preferably, the quantity of described control module is at least two.
As mentioned above, a kind of multisection type cascade drive circuit of the present invention, has following beneficial effect:
1, the control module of Linear Driving is connected in series by the present invention, when detecting that power input voltage changes, control module can according to the height of input voltage, control opening and closing of different switching tube, under making different LED be operated in different operating states, and can be controlled by the electric current of current-limiting resistance to every paths of LEDs be connected with metal-oxide-semiconductor field effect transistor.Thus the mode of cascade of the present invention, can by the control module of any multistage according to input voltage and product need carry out cascade, to reach the design requirement of product.
2, the present invention is owing to have employed the multiple control mode of cascade, the conducting of LED is rendered as more multistage, and LED conducting voltage curve and the matching more of input voltage curve, so the power factor of power supply can be higher, THD also can be less, and power-efficient also can be higher.
3, the present invention is owing to have employed the multiple control mode of cascade, the ON time more refinement of LED, and when accepting PWM dim signal, when LED is from shutoff to conducting, the response time of LED can be shorter, so dimming characteristic is better.
4, because the present invention is owing to have employed the control mode of cascade, so the conducting of LED is rendered as more multistage, the ON time more refinement of LED, can improve the utilance of LED.
What 5, circuit of the present invention connected very is simple, and easily realizes, and by the control mode of this cascade, can improve efficiency and the power factor of power supply, power-efficient can accomplish 0.95, and power factor is greater than 0.99, THD and is less than 10%.
Accompanying drawing explanation
Fig. 1 is shown as the general topology schematic diagram that in prior art, LED linear drives.
Fig. 2 is shown as the structural representation of a kind of multisection type cascade drive circuit in prior art.
Fig. 3 is shown as the structural representation of a kind of multisection type cascade drive circuit of the present invention.
Fig. 4 is shown as the control schematic diagram of a kind of multisection type cascade drive circuit of the present invention.
Element numbers explanation
1
11', 11 power modules
12', 12 control modules
13', 13 load blocks
14', 14 switch modules
15 steady resistances
Embodiment
By particular specific embodiment, embodiments of the present invention are described below, person skilled in the art scholar the content disclosed by this specification can understand other advantages of the present invention and effect easily.
Notice, structure, ratio, size etc. that this specification institute accompanying drawings illustrates, content all only in order to coordinate specification to disclose, understand for person skilled in the art scholar and read, and be not used to limit the enforceable qualifications of the present invention, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under effect that the present invention can produce and the object that can reach, still all should drop on disclosed technology contents and obtain in the scope that can contain.Simultaneously, quote in this specification as " on ", D score, "left", "right", " centre " and " one " etc. term, also only for ease of understanding of describing, and be not used to limit the enforceable scope of the present invention, the change of its relativeness or adjustment, under changing technology contents without essence, when being also considered as the enforceable category of the present invention.
The invention provides a kind of multisection type cascade drive circuit, for improving efficiency and the power factor of power supply in prior art.To principle and the execution mode of a kind of multisection type cascade drive circuit of the present invention be elaborated below, and make those skilled in the art not need creative work can understand a kind of multisection type cascade drive circuit of the present invention.
Refer to Fig. 3, be shown as the structural representation of a kind of multisection type cascade of the present invention drive circuit.As shown in Figure 3, the multisection type cascade drive circuit in the present invention comprises: power module 11, multiple control module 12, multiple load blocks 13 and multiple switch module 14.
The quantity of described control module 12 is at least two, and multiple control module 12 is connected in turn on the outlet line of power module 11.
Particularly, in the present embodiment, one end of described control module 12 is connected on the outlet line of power module 11, and the other end is connected with one end of switch module 14; One end of described load blocks 13 is connected on outlet line, and the other end is connected with other one end of described switch module 14.
In the present embodiment, the output of last control module 12 be connected on the outlet line of power module 11 is connected with steady resistance 15 simultaneously.
Particularly, in the present embodiment, described control module 12 comprises bleeder circuit, single-chip microcomputer, comparator, counter and logic control output module.
Bleeder circuit of the present invention is connected with power module 11, analyzes, determine whether there is overvoltage to by the voltage exported from power module 11, and carries out Control protection after determining overvoltage.
Described bleeder circuit carries out dividing potential drop to the voltage that power module 11 exports; Particularly, in the present embodiment, described bleeder circuit comprises the first divider resistance and second divider resistance of series connection, draws output from the intermediate connections of the first divider resistance and the second divider resistance.
Generally, also current rectifying and wave filtering circuit is connected with between described bleeder circuit and described power module 11.Choosing with known by those skilled in the art of concrete current rectifying and wave filtering circuit.In the present embodiment, current rectifying and wave filtering circuit conventional in prior art is chosen.
The branch pressure voltage that the Vesnse pin of described single-chip microcomputer is connected with the output of described bleeder circuit, exported by described bleeder circuit is introduced in single-chip microcomputer.The branch pressure voltage exported by described bleeder circuit by Vesnse pin is introduced in single-chip microcomputer; just can be analyzed the voltage introduced by single-chip microcomputer; determine whether there is overvoltage, simultaneously when overvoltage, single-chip microcomputer also can export the control signal of carrying out protective circuit.
The Vcc pin of single-chip microcomputer is on the outlet line of pull-up resistor access power module 11.
Particularly; in the present invention; the mode that the comparator sum counter of single-chip microcomputer inside can be adopted to combine is carried out monitoring input voltage and whether be there is overvoltage; avoid in prior art the trouble adopting a lot of peripheral circuits be connected with single-chip microcomputer; as can be seen here; control module 12 of the present invention, while the control to load blocks 13, also achieves overvoltage protection, reaches again the object simplifying circuit structure simultaneously.
Particularly, described comparator is positioned at single-chip microcomputer inside, is connected with described Vesnse pin, and compares the described branch pressure voltage of Vesnse pin introducing and the reference voltage of single-chip microcomputer inside; Described comparator exports the first comparative result when the reference voltage of branch pressure voltage higher than single-chip microcomputer inside, exports the second comparative result when the reference voltage of branch pressure voltage lower than single-chip microcomputer inside.First comparative result or the second comparative result are input in described counter by described comparator.
It is inner that described counter is placed in described single-chip microcomputer, is connected with described comparator, and described counter starts counting when receiving the first comparative result, export the first count results, and described counter starts counting when receiving the second comparative result, export the first count results.
Described logic control output module is also arranged in described single-chip microcomputer, and be connected with described counter, adjust the reference voltage of single-chip microcomputer inside when described first count results reaches the first default numerical value and export open command, disconnecting to make the switch module be connected with load.Or described logic control output module adjusts the reference voltage of single-chip microcomputer inside and exports turn-on command to make switch module 14 conducting be connected with load blocks 13 when described second count results reaches default second value.
The present invention passes through the mode adopting rolling counters forward, and when the numerical value that counter is counted reaches certain numerical value, then confirm to there is overvoltage, thus can effectively prevent from causing erroneous judgement to miss the phenomenon of protection because of the voltage fluctuation of accidentalia appearance.
In addition, in the present embodiment, the control of described logic control output module to described counter is as follows:
Described logic control output module control counter when described first count results does not reach the first default numerical value or when the second count results does not reach default second value stops counting.
Second count results, when receiving the second comparative result, by the first count results zero, when receiving the first comparative result, makes zero by described counter.And, after described counter stops counting, when described counter receives the first comparative result or the second comparative result again, restart counting.
Particularly, the Control protection process of described logic control output module is as follows:
Described logic control output module is when judging that described first count results reaches the first default numerical value, described logic control output module enters into overvoltage control model, the reference voltage of described logic control output module adjustment single-chip microcomputer inside makes output current diminish, thus the switch module 14 be connected with load blocks 13 is disconnected.If when described first count results does not reach the first default numerical value, described logic control output module controls described counter and stops counting, if there is high voltage again, described counter counts again, to prevent the appearance of protection by mistake.
After described logic control output module enters into overvoltage control model, if described counter receives the second comparative result that described comparator exports, described counter starts counting, export the second count results, when rolling counters forward reaches the second value of setting, described logic control output module enters normal voltage control model, the reference voltage of described logic control output module adjustment single-chip microcomputer inside makes output current recover normal, thus makes switch module 14 conducting that is connected with load blocks 13.If described counter does not reach set point, described logic control output module controls described counter and stops counting, if there is low-voltage again, described counter recalculates, to prevent the appearance of misoperation.
Multiple load blocks 13 is connected on the outlet line of power module 11 successively, and correspondingly with multiple control module 12 connects, by control module 12 controlling run of correspondence.Further, in the present embodiment, as shown in Figure 3, the order that is connected on outlet line of multiple control module 12 is contrary with the corresponding order of multiple load blocks 13 on outlet line controlled.
Multiple switch module 14 is connected between corresponding control module 12 and load blocks 13, by the operation of the order control load module 13 of control module 12.
In the present embodiment, switch module 14 can introduce the control module corresponding to this switch module through control module 12 above successively.
Particularly, in the present embodiment, described switch module 14 is made up of metal-oxide-semiconductor field effect transistor, and described load blocks 13 is made up of light-emitting diode (LED).Each metal-oxide-semiconductor field effect transistor correspondence controls a light-emitting diode.
In the present embodiment, particularly, current-limiting resistance is connected with between described power module 11 and each metal-oxide-semiconductor field effect transistor.
Adopt cascade Mach-Zehnder interferometer mode as above, the conducting of LED is rendered as more multistage, LED conducting voltage curve and the matching more of input voltage curve, so the power factor of power supply can be higher, THD also can be less, and power-efficient also can be higher; The ON time more refinement of LED simultaneously, when accepting PWM dim signal, when LED is from shutoff to conducting, the response time of LED can be shorter, so dimming characteristic is better, just because of the conducting of LED is rendered as more multistage, the ON time more refinement of LED, can improve the utilance of LED.
The control module 12 of Linear Driving is connected in series by the present invention, when detecting that power input voltage changes, control circuit can according to the height of input voltage, control opening and closing of different switch (metal-oxide-semiconductor field effect transistor), under making different LED be operated in different operating states, and can be controlled by the electric current of current-limiting resistance to every paths of LEDs be connected with metal-oxide-semiconductor field effect transistor.Thus the mode of cascade of the present invention, can by the control module 12 of any multistage according to input voltage and product need carry out cascade, to reach the design requirement of product.
Carry out being cascaded as example with two control modules 12 to be described, as shown in Figure 4, be shown as the control schematic diagram of a kind of multisection type cascade drive circuit of the present invention.The drived control process of this multisection type cascade drive circuit is as follows:
When reaching first paragraph LED(light-emitting diode) voltage of D1 time, metal-oxide-semiconductor field effect transistor Q1 opens ground connection, make LEDD1 conducting over the ground, when reaching the voltage of second segment LED D2, metal-oxide-semiconductor field effect transistor Q1 disconnects, metal-oxide-semiconductor field effect transistor Q2 opens ground connection, make LED D1 and LED D2 conducting over the ground, when reaching the voltage of the 3rd section of LED D3, metal-oxide-semiconductor field effect transistor Q1, metal-oxide-semiconductor field effect transistor Q2 disconnects, metal-oxide-semiconductor field effect transistor Q3 opens ground connection, make LED D1, LED D2 and LEDD3 conducting over the ground, when reaching the voltage of the 4th section of LED D4, metal-oxide-semiconductor field effect transistor Q1, metal-oxide-semiconductor field effect transistor Q2 and metal-oxide-semiconductor field effect transistor Q3 disconnects, metal-oxide-semiconductor field effect transistor Q4 opens ground connection, make LED D1, LED D2, LED D3 and LEDD4 conducting over the ground, when reaching the voltage of the 5th section of LED D5, metal-oxide-semiconductor field effect transistor Q5 opens ground connection, metal-oxide-semiconductor field effect transistor Q1 ~ metal-oxide-semiconductor field effect transistor Q4 disconnects, make LED D1 ~ LED D5 conducting over the ground, when reaching the voltage of the 6th section of LED D6, metal-oxide-semiconductor field effect transistor Q1 ~ metal-oxide-semiconductor field effect transistor Q5 disconnects, metal-oxide-semiconductor field effect transistor Q6 opens ground connection, make LEDD1 ~ LED D6 conducting over the ground, when reaching the voltage of the 7th section of LED D7, metal-oxide-semiconductor field effect transistor Q1 ~ metal-oxide-semiconductor field effect transistor Q6 disconnects, metal-oxide-semiconductor field effect transistor Q7 opens ground connection, make LED D1 ~ LED D7 conducting over the ground, when reaching the voltage of the 8th section of LED D8, metal-oxide-semiconductor field effect transistor Q1 ~ metal-oxide-semiconductor field effect transistor Q7 disconnects, metal-oxide-semiconductor field effect transistor Q8 opens ground connection, make LEDD1 ~ LED D8 conducting over the ground simultaneously, by this control mode, efficiency and the power factor of power supply can be improved, by the control mode of this cascade, power-efficient can accomplish 0.95, power factor is greater than 0.99, THD is less than 10%.
The present invention by the control mode of this cascade, can carry out cascade, to reach more preferably circuit parameter to two each and every one and plural control modules 12.
In sum, a kind of multisection type cascade drive circuit of the present invention, has following beneficial effect:
1, the control module of Linear Driving is connected in series by the present invention, when detecting that power input voltage changes, control module can according to the height of input voltage, control opening and closing of different switching tube, under making different LED be operated in different operating states, and can be controlled by the electric current of current-limiting resistance to every paths of LEDs be connected with metal-oxide-semiconductor field effect transistor.Thus the mode of cascade of the present invention, can by the control module of any multistage according to input voltage and product need carry out cascade, to reach the design requirement of product.
2, the present invention is owing to have employed the multiple control mode of cascade, the conducting of LED is rendered as more multistage, and LED conducting voltage curve and the matching more of input voltage curve, so the power factor of power supply can be higher, THD also can be less, and power-efficient also can be higher.
3, the present invention is owing to have employed the multiple control mode of cascade, the ON time more refinement of LED, and when accepting PWM dim signal, when LED is from shutoff to conducting, the response time of LED can be shorter, so dimming characteristic is better.
4, because the present invention is owing to have employed the control mode of cascade, so the conducting of LED is rendered as more multistage, the ON time more refinement of LED, can improve the utilance of LED.
What 5, circuit of the present invention connected very is simple, and easily realizes, and by the control mode of this cascade, can improve efficiency and the power factor of power supply, power-efficient can accomplish 0.95, and power factor is greater than 0.99, THD and is less than 10%.
So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (7)
1. a multisection type cascade drive circuit, is characterized in that, comprising:
Power module;
Multiple control module, is connected in turn on the outlet line of power module, can by the control module of any multistage according to input voltage and product need carry out cascade;
Multiple load blocks, is connected on the outlet line of power module successively, and correspondingly with multiple control module connects, by the control module controlling run of correspondence;
Multiple switch module, is connected between corresponding control module and load blocks, by the operation of the order control load module of control module;
One end of described control module is connected on the outlet line of power module, and the other end is connected with one end of switch module; One end of described load blocks is connected on outlet line, and the other end is connected with other one end of described switch module.
2. multisection type cascade drive circuit according to claim 1, is characterized in that, the output of last control module be connected on the outlet line of power module is connected with steady resistance.
3. multisection type cascade drive circuit according to claim 1, it is characterized in that, described switch module is made up of metal-oxide-semiconductor field effect transistor, and described load blocks is made up of light-emitting diode.
4. multisection type cascade drive circuit according to claim 1, is characterized in that, be connected with current-limiting resistance between described power module and each metal-oxide-semiconductor field effect transistor.
5. multisection type cascade drive circuit according to claim 1, is characterized in that, the order that multiple control module is connected on outlet line is contrary with the corresponding order of multiple load blocks on outlet line controlled.
6. multisection type cascade drive circuit according to claim 1, it is characterized in that, switch module introduces the control module corresponding to this switch module through control module above successively.
7. multisection type cascade drive circuit according to claim 1, is characterized in that, the quantity of described control module is at least two.
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| CN103857155B (en) * | 2014-04-04 | 2016-11-23 | 开源集成电路(苏州)有限公司 | A kind of linear series switch LED illumination drive circuit and method |
| CN107493635A (en) * | 2017-09-22 | 2017-12-19 | 浙江晶日照明科技有限公司 | A kind of more pixel drive systems of LED |
| CN109041350B (en) * | 2018-09-06 | 2021-03-05 | 上海斯望照明科技有限公司 | Direct-current power supply control method |
| CN113597053B (en) * | 2021-07-26 | 2022-10-14 | 南昌大学 | LED drive circuit |
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| CN102811538A (en) * | 2012-07-24 | 2012-12-05 | 上海亚明照明有限公司 | Driving circuit for light emitting diode (LED) module |
| CN103124463A (en) * | 2013-01-24 | 2013-05-29 | 石崇源 | LED lighting device with high power factor |
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| US6621235B2 (en) * | 2001-08-03 | 2003-09-16 | Koninklijke Philips Electronics N.V. | Integrated LED driving device with current sharing for multiple LED strings |
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| CN102811538A (en) * | 2012-07-24 | 2012-12-05 | 上海亚明照明有限公司 | Driving circuit for light emitting diode (LED) module |
| CN103124463A (en) * | 2013-01-24 | 2013-05-29 | 石崇源 | LED lighting device with high power factor |
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