CN103260316B - Two-circuit current-limiting driving circuit and two-circuit current-limiting driving method - Google Patents
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Abstract
The invention discloses a two-circuit current-limiting driving circuit and a two-circuit current-limiting driving method. The two-circuit current-limiting driving circuit and the two-circuit current-limiting driving method are mainly used for supplying power to an LED. The two-circuit current-limiting driving circuit comprises an alternating-current power supply, a rectifier, an energy-storage capacitor, a double-current-limiting circuit and a load, wherein the alternating-current power supply is connected with the input end of the rectifier, one output end of the rectifier is connected with the first end of the double-current-limiting circuit, another output end of the rectifier is connected with one end of the energy-storage capacitor and one end of the load, the other end of the energy-storage capacitor is connected with the second end of the double-current-limiting circuit, and the other end of the load is connected with the third end of the double-current-limiting circuit. According to the two-circuit current-limiting driving method, when the phase voltage of an alternating current is larger than the voltage at two ends of the energy-storage capacitor, the energy-storage capacitor is charged by the alternating current, power is provided for the load by the alternating current at the same time, and a power supply current is controlled by a current limiting circuit; when the phase voltage of the alternating current is lower than the voltage at two ends of the energy-storage capacitor, power is provided for a load tube by the energy-storage capacitor. The two-circuit current-limiting driving circuit and the two-circuit current-limiting driving method have the advantages that the power factor is high, frequent glittering is avoided, and the circuit is simple.
Description
Technical field
The present invention relates to power supply circuits and method, be specifically related to a kind of double loop current-limiting drive circuit and method, be particularly useful for being that LED illumination drives.
Technical background
At present, LED illumination is energy-conservation with it, and environmental protection and long-life promote rapidly, and LED lamp has entered into the illumination application of every field widely.LED can not be directly connected to alternating current, needs to configure corresponding current limliting drive unit, and current LED drives the scheme used based on traditional high frequency switch power, the program is due to needs high-frequency switch circuit, circuit is complicated, and cost is high, and numerous manufacturer is converted linear current limliting drive scheme.
In Fig. 1, alternating current 101 charges to storage capacitor 103 via the positive-negative half-cycle peak value of rectifier 102 at sine wave, the voltage that storage capacitor 103 maintains its two ends is greater than the voltage at LED 105 two ends all the time, flow restricter 104 bear storage capacitor exceeds LED voltage to maintain the current constant of LED 105.When alternating current 101 charges to storage capacitor 103, charging current peak value is very high, causes the power factor of Fig. 1 drive circuit very low, usually only has about 0.5.
Fig. 2 removes storage capacitor on the basis of Fig. 1, its operation principle is that alternating current 201 sine voltage instantaneous value is when being greater than LED 204, alternating current 201 electric current powers to LED 204 and flow restricter 203 via rectifier 202, when the sinusoidal wave instantaneous value of alternating current 201 is less than LED 204, there is no Energy transmission.Owing to directly not connecting large storage capacitor after rectifier 202, the power factor of this circuit is improved, but the electric current in LED is interrupted, its interruption period is 2 times of ac frequency, and this will cause the appreciable optical flare of human eye.
Summary of the invention
For the technological deficiency that above-mentioned prior art exists, the technical problem to be solved in the present invention is: provide a kind of power factor high, and unaware exports dodges drive circuit frequently and driving method.
For solving the problems of the technologies described above the technical solution used in the present invention being: a kind of double loop current-limiting drive circuit, comprising an AC power, a rectifier, a storage capacitor, a pair of current limliting loop and a load; Wherein, described AC power is sine wave alternating current, AC power is connected with the input of rectifier, rectifier one output is connected with the first end in two current limliting loop, another output of rectifier is connected with one end of load respectively with storage capacitor, the other end of storage capacitor is connected with second end in two current limliting loop, and the other end of load is connected with the 3rd end in two current limliting loop.
Preferably, described load is LED.
Preferably, described pair of current limliting loop comprises an adjustable current source, a current-limiting circuit, a control circuit.
Described adjustable current source first power end is connected to the first end in two current limliting loop, and the second power end is connected to second end in two current limliting loop, and control end is connected to the output of control circuit.
First power end of described current-limiting circuit is connected to the first end in two current limliting loop, and the second power end is connected to the 3rd end in two current limliting loop, and output is connected to the input of control circuit.
First power end of described current-limiting circuit is connected to second end in two current limliting loop, and the second power end is connected to the 3rd end in two current limliting loop, and output is connected to the input of control circuit.
Preferably, described control circuit comprises error amplifier.
Preferably, described control circuit comprises integrator.
Preferably, a switch in parallel between described adjustable current source first power end and the second power end, this switch, in order to provide storage capacitor to current path during load discharge, ends when storage capacitor charges, conducting during electric discharge.
Preferably, described switch is diode.
Preferably, described current-limiting circuit comprises at least one resistance.
Preferably, described cut-off current comprises a field effect transistor, an operational amplifier, a reference voltage and a resistance.
Preferably, described adjustable current source comprises a field effect transistor and a resistance.
A kind of double loop current limliting driving method that the present invention proposes, comprise: when the phase voltage of alternating current is greater than storage capacitor both end voltage, alternating current charges to storage capacitor, charging current value is controlled by adjustable current source, while alternating current is to storage capacitor charging, alternating current powering load, supply current is controlled by current-limiting circuit; When the phase voltage of alternating current is less than storage capacitor both end voltage, storage capacitor powering load, supply current is controlled by current-limiting circuit.
Preferably, adjustable current source described in the method is controlled by the pressure drop of current-limiting circuit power end, and when this pressure drop raises, adjustable current source output current reduces, and when this pressure drop reduces, adjustable current source output current raises.
Preferably, adjustable current source described in the method is controlled by the electric current flowing through current-limiting circuit, and when the electric current flowing through current-limiting circuit raises, adjustable current source output current reduces, when the electric current flowing through current-limiting circuit reduces, adjustable current source output current raises.
Two current limliting loop is interval in alternating current out of phase, realize alternating current, the difference of energy exchange between storage capacitor and load configuration, wherein, power factor is improved to the electric current of storage capacitor charging by adjustable current source limiting AC electricity, the electric current being flowed through load by current-limiting circuit restriction makes output current steady, the adjustment of storage capacitor charging current is realized, the efficiency of optimized driving circuit by the operational factor/feature of detectability current circuit.
The technique effect that the present invention obtains is: power factor is higher, outputs to LED without stroboscopic, and circuit is simple, and cost is low, is easy to extensive use.
Accompanying drawing explanation
The linear current-limiting drive circuit that Fig. 1 is traditional.
Fig. 2 is the linear current-limiting drive circuit improving power factor in prior art.
Fig. 3 is double loop of the present invention current-limiting drive circuit fundamental diagram.
Fig. 4 is another fundamental diagram of double loop of the present invention current-limiting drive circuit.
Fig. 5 is a kind of preferred embodiment of double loop of the present invention current-limiting drive circuit.
Fig. 6 is the another kind of preferred embodiment of double loop of the present invention current-limiting drive circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 3 is circuit theory diagrams of the present invention, in figure, AC power 301 connects the input of rectifier 302, output one end of rectifier 302 connects two current limliting loop 318, the other end of rectifier 302 connects one end of storage capacitor 303 and load 314, the other end of load 314 and storage capacitor 303 is connected respectively to two ports in two current limliting loop 318, and wherein two current limliting loop 318 comprises adjustable current source 315, control circuit 316 and current-limiting circuit 317.
Two current limliting loop 318 is between the phase region that alternating current 301 is different, realize the difference configuration of alternating current 301, energy exchange between storage capacitor 303 and load 314, wherein, the electric current charging to storage capacitor 303 by adjustable current source 315 limiting AC electricity 301 improves power factor, the electric current being flowed through load 314 by current-limiting circuit 317 restriction makes output current steady, the adjustment of storage capacitor 304 charging current is realized, the efficiency of optimized driving circuit by the operational factor/feature of detectability current circuit 317.
Fig. 4 is another circuit theory diagrams of the present invention, in figure, AC power 401 connects the input of rectifier 402, output one end of rectifier 402 connects two current limliting loop 418, the other end of rectifier 402 connects one end of storage capacitor 403 and load 414, the other end of load 414 and storage capacitor 403 is connected respectively to two ports in two current limliting loop 418, and wherein two current limliting loop 418 comprises adjustable current source 415, control circuit 416 and current-limiting circuit 417.
Two current limliting loop 418 is between the phase region that alternating current 401 is different, realize the difference configuration of alternating current 401, energy exchange between storage capacitor 403 and LED 414, wherein, the electric current charging to storage capacitor 403 by adjustable current source 415 limiting AC electricity 401 improves power factor, the electric current being flowed through LED 414 by current-limiting circuit 417 restriction makes output current steady, the adjustment of storage capacitor 403 charging current is realized, the efficiency of optimized driving circuit by the operational factor/feature of detectability current circuit 417.
Fig. 5 is a kind of embodiment schematic diagram of double loop of the present invention current-limiting drive circuit, comprising: alternating current 501, rectifier 502, storage capacitor 503, two current limliting loop 518 and LED 514.Wherein,
Alternating current 501 inputs with rectifier 502 and is connected, the output negative pole of rectifier 502 is connected ground with the first end in two current limliting loop 518, the output cathode of rectifier 502 is connected with one end of storage capacitor 503, the other end of storage capacitor 503 is connected with second end in two current limliting loop 518, the anode of LED 514 is connected with the output cathode of rectifier 502, and negative electrode is connected with the 3rd end in two current limliting loop 518.
Two current limliting loop 518 comprises diode 504, adjustable current source 515, control circuit 516 and current-limiting circuit 517.Wherein, adjustable current source 515 comprises field effect transistor 505 and resistance 506;
Control circuit 516 comprises trsanscondutance amplifier 508, reference voltage 509 and building-out capacitor 507;
Current-limiting circuit comprises reference voltage 510, operational amplifier 511, field effect transistor 512 and resistance 513.
The drain electrode of field effect transistor 512 is connected to the negative electrode of LED 514, source electrode is via resistance 513 ground connection, gate pole is connected to the output of operational amplifier 511, the in-phase input end of operational amplifier 511 is connected to the positive pole of reference voltage 510, and inverting input is connected to the source electrode of field effect transistor 512 and the intersection of resistance 513;
The inverting input of trsanscondutance amplifier 508 is connected to the inverting input of operational amplifier 511, and in-phase input end is connected to the positive pole of reference voltage 509, and output is Shunt compensation capacitor 507 over the ground, and is connected to the gate pole of field effect transistor 505;
The drain electrode of field effect transistor 505 is connected to the negative electrode of diode 504, and source electrode is via resistance 506 ground connection;
The minus earth of the anode of diode 504, the negative pole of reference voltage 509 and reference voltage 510;
The operation principle of this circuit is as follows:
When the phase voltage of alternating current 501 is greater than storage capacitor 503 both end voltage, rectifier bridge 502 conducting, diode 504 oppositely ends, the charging of storage capacitor 503 given by alternating current 501, charging current is controlled by adjustable current source 515, charging current path is: alternating current 501 → rectifier 502 → storage capacitor 503 → field effect transistor 505 → resistance 506 → rectifier bridge 502 → alternating current 501, simultaneously, alternating current 501 is powered for LED 514, supply current restricted flow circuit 517 controls, current flow paths is: alternating current 501 → rectifier 502 → LED 514 → field effect transistor 512 → resistance 513 → rectifier bridge 502 → alternating current 501, when the phase voltage of alternating current 501 is less than storage capacitor 503 both end voltage, diode 504 conducting, rectifier bridge 502 oppositely ends, the energy of LED 514 is provided by storage capacitor 503, the discharging current of storage capacitor to LED 514 is controlled by current-limiting circuit 517, and discharge current path is: storage capacitor 503 → LED 514 → field effect transistor 512 → resistance 513 → diode 504 → storage capacitor 503.
The voltage at resistance 513 two ends is fed into the inverting input of trsanscondutance amplifier 508, trsanscondutance amplifier 508 and building-out capacitor 507 do integral operation to the error between this voltage and reference voltage 509, voltage control after integration flows through the electric current of field effect transistor 505 and resistance 506, therefore
When the voltage at resistance 513 two ends is greater than reference voltage 509, the output voltage of trsanscondutance amplifier 508 declines, adjustable current source 515 makes alternating current 501 reduce to the charging current of storage capacitor 503, further, storage capacitor 503 both end voltage declines, again further, the voltage at field effect transistor 512 two ends also declines;
When the voltage at resistance 513 two ends is less than reference voltage 509, the output voltage of trsanscondutance amplifier 508 rises, adjustable current source 515 makes alternating current 501 increase to the charging current of storage capacitor 503, further, storage capacitor 503 both end voltage rises, again further, the voltage at field effect transistor 512 two ends also rises;
The result of above-mentioned adjustment process is: the mean value of the voltage at resistance 513 two ends equals the set point of reference voltage 509, the maximum current of LED 514 is the set point of current-limiting circuit 517, and average current is the setting voltage of reference voltage 509 and the ratio of resistance 513.
Fig. 6 is the another kind of embodiment schematic diagram of double loop of the present invention current-limiting drive circuit, comprising: alternating current 601, rectifier 602, storage capacitor 603, two current limliting loop 618 and LED 614.Wherein,
Alternating current 601 inputs with rectifier 602 and is connected, the output negative pole of rectifier 602 is connected ground with the first end in two current limliting loop 618, the output cathode of rectifier 602 is connected with one end of storage capacitor 603, the other end of storage capacitor 603 is connected with second end in two current limliting loop 618, the anode of LED 614 is connected with the output cathode of rectifier 602, and negative electrode is connected with the 3rd end in two current limliting loop 618.
Two current limliting loop 618 comprises adjustable current source 615, control circuit 616 and current-limiting circuit 617.Wherein, adjustable current source 615 comprises field effect transistor 605 and resistance 606;
Control circuit 616 comprises trsanscondutance amplifier 608, reference voltage 609 and building-out capacitor 607;
Current-limiting circuit comprises resistance 611,612 and 613, triode 610.
Resistance 611 is connected to the second end and the 3rd end in two current limliting loop, and the emitter of triode 610 is connected to the 3rd end in two current limliting loop 618, and base stage is connected to second end in two current limliting loop 618 via resistance 612, and collector electrode is via resistance 613 ground connection;
The inverting input of trsanscondutance amplifier 608 is connected to the joint of triode 610 and resistance 613, and in-phase input end is connected to the positive pole of reference voltage 609, and output is Shunt compensation capacitor 607 over the ground, and is connected to the gate pole of field effect transistor 605;
The drain electrode of field effect transistor 605 is connected to second end in two current limliting loop 618, and source electrode is via resistance 606 ground connection;
The minus earth of reference voltage 609;
The operation principle of this circuit is as follows:
When the phase voltage of alternating current 601 is greater than storage capacitor 603 both end voltage, rectifier bridge 602 conducting, the charging of storage capacitor 603 given by alternating current 601, charging current is controlled by adjustable current source 615, charging current path is: alternating current 601 → rectifier 602 → storage capacitor 603 → field effect transistor 605 → resistance 606 → rectifier bridge 602 → alternating current 601, simultaneously, alternating current 601 is powered for LED 614, supply current restricted flow circuit 617 controls, current flow paths is: alternating current 601 → rectifier 602 → LED 614 → resistance 611 → field effect transistor 605 → resistance 606 → rectifier bridge 602 → alternating current 601, when the phase voltage of alternating current 601 is less than storage capacitor 603 both end voltage, rectifier bridge 602 oppositely ends, the energy of LED 614 is provided by storage capacitor 603, the discharging current of storage capacitor 603 pairs of LED 614 is controlled by current-limiting circuit 617, and discharge current path is: storage capacitor 603 → LED 614 → resistance 611 → storage capacitor 603.
Flow through the electric current of LED 614, limited by resistance 611, and also reacted at resistance 613 two ends by resistance 612 and triode 610 perception, the voltage at resistance 613 two ends is fed into the inverting input of trsanscondutance amplifier 608, trsanscondutance amplifier 608 and building-out capacitor 607 do integral operation to the error between this voltage and reference voltage 609, voltage control after integration flows through the electric current of field effect transistor 605 and resistance 606, therefore
When the voltage at resistance 613 two ends is greater than reference voltage 609, the output voltage of trsanscondutance amplifier 608 declines, adjustable current source 615 makes alternating current 601 reduce to the charging current of storage capacitor 603, further, storage capacitor 603 both end voltage declines, again further, the voltage at resistance 611 two ends also declines;
When the voltage at resistance 613 two ends is less than reference voltage 609, the output voltage of trsanscondutance amplifier 608 rises, adjustable current source 615 makes alternating current 601 increase to the charging current of storage capacitor 603, further, storage capacitor 603 both end voltage rises, again further, the voltage at resistance 611 two ends also rises;
The result of above-mentioned adjustment process is: the mean value of the voltage at resistance 613 two ends equals the set point of reference voltage 609, and the maximum current of LED 614 is that resistance 611 limits, and average current is relevant to the setting voltage value of reference voltage 609.
Above-described embodiment is to illustrate instead of limiting the present invention, those those skilled in the art can design many embodiment under the condition of scope not deviating from claims, word " comprises " existence of element or step different elements or the step do not got rid of and list in those and claim, element "a" or "an" does not get rid of the existence of multiple element, in the claim enumerating several circuit, several in these circuit can show by one, electronic device item is also same, only because some method describes in mutually different dependent claims, do not illustrate that the combination of these methods can not be used for making a profit.Above specific embodiment only describes principal character and the innovative point of this programme.Those skilled in the art should understand, and this programme is not restricted to the described embodiments.Under the prerequisite not departing from the innovation point and protection range, this programme also has various change, and these changes and improvements all will fall in the claimed scope of this programme.The claimed scope of this programme is limited by appending claims and equivalent thereof, and described switch comprises various equivalent switch electronic device, is not limited to diode or triode.
Claims (15)
1. a double loop current-limiting drive circuit, is characterized in that: comprise an AC power, a rectifier, a storage capacitor, a pair of current limliting loop and a load; Wherein, described AC power is sine wave alternating current, AC power is connected with the input of rectifier, rectifier one output is connected with the first end in two current limliting loop, another output of rectifier is connected with one end of load respectively with storage capacitor, the other end of storage capacitor is connected with second end in two current limliting loop, and the other end of load is connected with the 3rd end in two current limliting loop; Described pair of current limliting loop comprises an adjustable current source, a current-limiting circuit, a control circuit.
2. double loop according to claim 1 current-limiting drive circuit, is characterized in that: described load is LED.
3. double loop according to claim 1 current-limiting drive circuit, it is characterized in that: described adjustable current source first power end is connected to the first end in two current limliting loop, second power end is connected to second end in two current limliting loop, and control end is connected to the output of control circuit.
4. double loop according to claim 1 current-limiting drive circuit, it is characterized in that: the first power end of described current-limiting circuit is connected to the first end in two current limliting loop, second power end is connected to the 3rd end in two current limliting loop, and output is connected to the input of control circuit.
5. double loop according to claim 1 current-limiting drive circuit, it is characterized in that: the first power end of described current-limiting circuit is connected to second end in two current limliting loop, second power end is connected to the 3rd end in two current limliting loop, and output is connected to the input of control circuit.
6. double loop according to claim 1 current-limiting drive circuit, is characterized in that: described control circuit comprises error amplifier.
7. double loop according to claim 1 current-limiting drive circuit, is characterized in that: described control circuit comprises integrator.
8. double loop according to claim 3 current-limiting drive circuit, it is characterized in that: a switch in parallel between described adjustable current source first power end and the second power end, this switch is in order to provide storage capacitor to current path during load discharge, end when storage capacitor charges, conducting during electric discharge.
9. double loop according to claim 8 current-limiting drive circuit, is characterized in that: described switch is diode.
10. the double loop current-limiting drive circuit according to claim 4 or 5, is characterized in that: described current-limiting circuit comprises at least one resistance.
11. double loop current-limiting drive circuits according to claim 4 or 5, is characterized in that: described cut-off current comprises a field effect transistor, an operational amplifier, a reference voltage and a resistance.
12. double loop according to claim 3 current-limiting drive circuits, is characterized in that: described adjustable current source comprises a field effect transistor and a resistance.
13. 1 kinds of double loop current limliting driving methods utilizing double loop current-limiting drive circuit described in claim 1 or 2, it is characterized in that: when the phase voltage of alternating current is greater than storage capacitor both end voltage, alternating current charges to storage capacitor, charging current value is controlled by adjustable current source, while alternating current is to storage capacitor charging, alternating current powering load, supply current is controlled by current-limiting circuit; When the phase voltage of alternating current is less than storage capacitor both end voltage, storage capacitor powering load, supply current is controlled by current-limiting circuit.
14. according to current limliting driving method in double loop described in claim 13, it is characterized in that: described adjustable current source is controlled by the pressure drop of current-limiting circuit power end, when this pressure drop raises, adjustable current source output current reduces, when this pressure drop reduces, adjustable current source output current raises.
15. according to current limliting driving method in double loop described in claim 13, it is characterized in that: described adjustable current source is controlled by the electric current flowing through current-limiting circuit, when the electric current flowing through current-limiting circuit raises, adjustable current source output current reduces, when the electric current flowing through current-limiting circuit reduces, adjustable current source output current raises.
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| CN104703368B (en) * | 2015-03-31 | 2017-06-09 | 上海路傲电子科技有限公司 | Circuit and method that a kind of stroboscopic for improving LED light device and pressure are dodged |
| CN105915086B (en) * | 2016-04-15 | 2017-06-13 | 芜湖锐芯电子科技有限公司 | High-efficiency AC/D/C power circuit and its control method and method of supplying power to |
| CN107801268B (en) * | 2016-08-31 | 2019-11-15 | 华润矽威科技（上海）有限公司 | Linear high-efficiency constant current is without stroboscopic LED driving circuit and driving method thereof |
| CN107734745A (en) * | 2017-10-17 | 2018-02-23 | 上海源微电子科技有限公司 | A kind of high efficiency half presses LED linear drive circuit |
| CN108051632B (en) * | 2017-12-19 | 2023-06-06 | 西安安森智能仪器股份有限公司 | Method for supplying power to load of transmitter |
| CN110519881B (en) * | 2019-07-16 | 2022-05-13 | 深圳市稳先微电子有限公司 | LED driving circuit and control method thereof |
| CN111969866B (en) * | 2020-07-29 | 2022-01-18 | 湖北襄整整流器有限公司 | Current-limiting control method for rectifier bridge |
| CN112770444B (en) * | 2021-01-29 | 2023-03-14 | 漳州立达信光电子科技有限公司 | Full-cycle load driving system |
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Address after: 200030 room 6B9, No. 481, Guiping Road, Xuhui District, Shanghai, 15 rooms Patentee after: SHANGHAI LOOALL ELECTRONICS Co.,Ltd. Address before: Room E876, Building 1, 5500 Yuanjiang Road, Minhang District, Shanghai, 201111 Patentee before: SHANGHAI LUQIAN ELECTRONIC TECHNOLOGY Co.,Ltd. |
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Denomination of invention: A double circuit current limiting driving circuit and a double circuit current limiting driving method Effective date of registration: 20200916 Granted publication date: 20150617 Pledgee: Industrial Bank Co.,Ltd. Shanghai Minhang sub branch Pledgor: SHANGHAI LOOALL ELECTRONICS Co.,Ltd. Registration number: Y2020980006113 |
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Date of cancellation: 20220210 Granted publication date: 20150617 Pledgee: Industrial Bank Co.,Ltd. Shanghai Minhang sub branch Pledgor: SHANGHAI LOOALL ELECTRONICS Co.,Ltd. Registration number: Y2020980006113 |
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Application publication date: 20130821 Assignee: Shanghai Lingang Financial Leasing Co.,Ltd. Assignor: SHANGHAI LOOALL ELECTRONICS Co.,Ltd. Contract record no.: X2022980015095 Denomination of invention: A dual-loop current-limiting driving circuit and dual-loop current-limiting driving method Granted publication date: 20150617 License type: Exclusive License Record date: 20220913 |
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Denomination of invention: A dual-loop current-limiting driving circuit and dual-loop current-limiting driving method Effective date of registration: 20220915 Granted publication date: 20150617 Pledgee: Shanghai Lingang Financial Leasing Co.,Ltd. Pledgor: SHANGHAI LOOALL ELECTRONICS Co.,Ltd. Registration number: Y2022980015288 |