CN203377779U - Sectional-type power factor correction circuit - Google Patents
Sectional-type power factor correction circuit Download PDFInfo
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- CN203377779U CN203377779U CN201320433194.5U CN201320433194U CN203377779U CN 203377779 U CN203377779 U CN 203377779U CN 201320433194 U CN201320433194 U CN 201320433194U CN 203377779 U CN203377779 U CN 203377779U
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- switching tube
- control unit
- divider resistance
- emitting diodes
- current control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a sectional-type power factor correction circuit comprising a rectifier bridge, n light emitting diode strings, and n constant current control units. Each of the light emitting diode strings comprises at least two light emitting diodes, and anodes of the light emitting diode strings (from the second one to the n one) are connected with the cathodes of the superior light emitting diode strings, and therefore the serial connection circuit can be formed by serially connecting the light emitting diode strings from the first one to the n one. Two input ends of the rectifier bridge are connected with an AC voltage, and an output positive end of the rectifier bridge is connected with the anode of the first light emitting diode string, and the cathode of each of the light emitting diode strings is coupled with the corresponding constant current control unit. The constant control unit can be used to control the connection state of the cathode of the corresponding light emitting diode string according to the AC voltage. The sectional-type power factor correction circuit is advantageous in that the corresponding number of light emitting diode strings can be started in a sectional manner, and therefore the reliability and the power factor of the circuit can be effectively improved, and the pollution of the harmonic distortion on the power grid can be reduced.
Description
Technical field
The utility model relates to LED drive circuit, relates in particular to a kind of segmented circuit of power factor correction.
Background technology
LED, because of characteristics such as low in energy consumption, life-span are long, is applied in more and more wide field, especially in lighting field gradually replace incandescent become main product.
Wherein, the harmonic pollution that the LED power supply produces has been subject to extensive concern, there have been clear and definite requirement in relevant international organization or government organs to total harmonic distortion (THD), the IEC61000-3-2 formulated as International Electrotechnical Commission, the EN60555-2 that European Union formulates, and the rules such as standard GB/T 17625.1-2003 all harmonic distortion has all been made clearly and having been limited.The power supply of traditional common bridge rectifier circuit is large because of the power supply total harmonic distortion, electrical network has been produced very large pollution and no longer has been suitable for lighting field, and its line construction of power supply of Active Power Factor Correction (APFC) circuit with power factor correction is complicated, material cost is high, be not easy to safeguard and development process in also to face more unmanageable electromagnetic compatibility problem, improved LED light fixture cost, reduce the light fixture reliability, caused the larger wasting of resources.
The utility model content
The utility model is for the low problem of LED lamp power factor, provides that a kind of circuit is simple, the segmented circuit of power factor correction of small size, low cost, low electromagnetic, low harmonics distortion, high reliability.
For addressing the above problem, the utility model by the following technical solutions:
A kind of segmented circuit of power factor correction, comprise rectifier bridge, n group light-emitting diodes pipe string, and n constant current control unit; Comprise at least two light-emitting diodes in every group of light-emitting diodes pipe string, all be connected thereto the negative electrode of one group of light-emitting diodes pipe string from the 2nd group of anode to n group light-emitting diodes pipe string, form one by the 1st group of series circuit be connected to form in order to n group light-emitting diodes pipe string; Two of described rectifier bridge input termination alternating voltages, the output plus terminal of described rectifier bridge connects the anode of the 1st group of light-emitting diodes pipe string, all the be coupled constant current control unit of a correspondence of the negative electrode of every group of light-emitting diodes pipe string;
The test side of described constant current control unit connects the output plus terminal of described rectifier bridge, and the input of described constant current control unit connects the negative electrode of corresponding light-emitting diodes pipe string, the output head grounding of described constant current control unit.
In order to set forth more clearly advantage of the present utility model, the following n=3 of take is as with reference to circuit: suppose that with the constant current control unit of the corresponding connection of negative electrode of the 1st group of light-emitting diodes pipe string be the first constant current control unit, with the constant current control unit of the corresponding connection of negative electrode of the 2nd group of light-emitting diodes pipe string, being the second constant current control unit, is the 3rd constant current control unit with the constant current control unit of the corresponding connection of negative electrode of the 3rd group of light-emitting diodes pipe string;
When the voltage of the output plus terminal of rectifier bridge be less than rated voltage 1/3 the time, electric current is ground connection after the 1st group of light-emitting diodes pipe string and the second constant current control unit, i.e. only the 1st group of light-emitting diodes pipe string conducting work; When the voltage of the output plus terminal of rectifier bridge in rated voltage 1/3 and 2/3 between the time, electric current is ground connection after the 1st group of light-emitting diodes pipe string, the 2nd group of light-emitting diodes pipe string and the second constant current control unit, now the 1st group of light-emitting diodes pipe string, the 2nd group of light-emitting diodes pipe string conducting work; When the voltage of the output plus terminal of rectifier bridge be greater than rated voltage 2/3 the time, 3 groups of equal conducting work of light-emitting diodes pipe string;
As mentioned above, the utility model can segmented start the corresponding light-emitting diodes pipe string of organizing number, has effectively improved reliability and the power factor of circuit, reduces the pollution that harmonic distortion causes electrical network.
The accompanying drawing explanation
Fig. 1 is the circuit block diagram of segmented circuit of power factor correction of the present utility model;
Fig. 2 is the circuit connection diagram of the utility model in a preferred embodiment.
Embodiment
In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, 2, the utility model segmented circuit of power factor correction comprises rectifier bridge, n group light-emitting diodes pipe string, and n constant current control unit, comprise at least two light-emitting diodes in every group of light-emitting diodes pipe string, and the light-emitting diode quantity in every group of light-emitting diodes pipe string is identical, from the 1st group to n group light-emitting diodes pipe string, connect in order, from the 2nd group of anode to n group light-emitting diodes pipe string all be connected thereto one group of light-emitting diodes pipe string negative electrode (as, the negative electrode of the 1st group of light-emitting diodes pipe string of anodic bonding of the 2nd group of light-emitting diodes pipe string, the negative electrode of the 2nd group of light-emitting diodes pipe string of anodic bonding of the 3rd group of light-emitting diodes pipe string, ..., the negative electrode of the anodic bonding n-1 group light-emitting diodes pipe string of n group light-emitting diodes pipe string), form one by the 1st group of series circuit of to n group light-emitting diodes pipe string, connecting in order and forming, two input termination alternating voltages of rectifier bridge, the output plus terminal of rectifier bridge connects the anode of described the 1st group of light-emitting diodes pipe string, rectifier bridge output negativing ending grounding, wherein, from be coupled the respectively constant current control unit of a correspondence of the 1st group of negative electrode to n group light-emitting diodes pipe string, be appreciated that, n group light-emitting diode pipe string is in series in order from the 1st group to the n group, the 1st group of negative electrode to the light-emitting diodes pipe string of n group becomes relation one to one with sequence number from 1 to n constant current control unit, the negative electrode of m group light-emitting diodes pipe string connects the constant current control unit that sequence number is m, 1≤m≤n.
The constant current control unit comprises test side, input and output; Wherein, the test side of constant current control unit connects the output plus terminal of rectifier bridge, and the input of constant current control unit connects the negative electrode of corresponding light-emitting diodes pipe string, the output head grounding of constant current control unit.
The constant current control unit that the sequence number of take is m is example, and the test side of this constant current control unit is connected with the output plus terminal of rectifier bridge, and the input of this constant current control unit is connected with the negative electrode of m group light-emitting diodes pipe string, the output head grounding of this constant current control unit.
During concrete enforcement:
The constant current control unit comprises first, second divider resistance and amplifier, switching tube, the first divider resistance is connected with the second divider resistance, the test side of another termination of the first divider resistance (or as) constant current control unit, the other end ground connection of the second divider resistance, the in-phase input end of amplifier connects reference voltage, the anti-phase input of amplifier terminates on the tie point between the first divider resistance and the second divider resistance, the output of amplifier is connected with the first end of switching tube, the input of the second termination of switching tube (or as) constant current control unit, with corresponding light-emitting diodes pipe string negative electrode, be connected, the output of the 3rd termination of switching tube (or as) constant current control unit.Further, the 3rd end of switching tube is by current-limiting resistance ground connection, prevents from that electric current is excessive LED is caused to damage.In the side circuit application, switching tube can adopt nmos pass transistor, and the first end of switching tube is grid, and the second end of switching tube is drain electrode, and the 3rd end of switching tube is source electrode, certainly, also can adopt other voltage-controlled electronic components to replace.
In a preferred embodiment, also be connected with a under-voltage locking unit between n constant current control unit and ground, this voltage lock cell comprises the 3rd divider resistance, the 4th divider resistance, comparator and under-voltage switching tube; The 3rd divider resistance is connected with the 4th divider resistance, the other end of the 3rd divider resistance connects the output plus terminal of rectifier bridge, the other end ground connection of the 4th divider resistance, the in-phase input end of comparator is connected on the tie point between the 3rd resistance and the 4th resistance, the anti-phase input termination reference voltage of comparator, the output of comparator is connected with the first end of under-voltage switching tube, and the second end of under-voltage switching tube connects the output of n constant current control unit, the 3rd end ground connection of under-voltage switching tube.This principle of optimality is as follows: when the voltage of the output plus terminal of rectifier bridge is one when being not enough to start single group light-emitting diodes pipe string; the critical value of supposing this voltage is Vmin; when the voltage of the output plus terminal of rectifier bridge<Vmin; the in-phase input end voltage of comparator is lower than reference voltage; the output output low level of comparator is to the first end of under-voltage switching tube; under-voltage switching tube cut-off, make circuit in open-circuit condition, with the safety of protection LED under low-voltage state.In concrete application, under-voltage switching tube can adopt nmos pass transistor, and the first end of under-voltage switching tube is grid, and the second end of under-voltage switching tube is drain electrode, and the 3rd end of under-voltage switching tube is source electrode, certainly, also can adopt other voltage-controlled electronic components to replace.
For the utility model is more readily understood, below with n=3(, contain 3 groups of light-emitting diodes pipe strings, and the light-emitting diode quantity of every group of light-emitting diodes pipe string all is made as 20) the physical circuit of segmented circuit of power factor correction be connected to example, and by this example, circuit theory is made to analysis:
As shown in Figure 2, can understand, in this connection layout, light-emitting diodes pipe string 1, light-emitting diodes pipe string 2 and light-emitting diodes pipe string 3 are connected in order; Wherein, the negative electrode of the 1st group of light-emitting diodes pipe string 1 connects anode the corresponding constant current control unit 1a that connects of the 2nd group of light-emitting diodes pipe string 2, the negative electrode of the 2nd group of light-emitting diodes pipe string 2 connects anode the corresponding constant current control unit 2b that connects of the 3rd group of light-emitting diodes pipe string 3, the corresponding constant current control unit 3c that connects of the negative electrode of the 3rd group of light-emitting diodes pipe string 3.
The under-voltage locking unit comprises divider resistance R13, divider resistance R14, resistance 15, diode D4, nmos pass transistor VT4, comparator A4 and a reference circuit, the output of this comparator A4 connects the grid of nmos pass transistor VT4 by resistance R 15, the source ground of nmos pass transistor VT4, the in-phase input end of comparator A4 connects the negative electrode of diode D4 and passes through divider resistance R14 ground connection by divider resistance R13 respectively, the anode of diode D4 connects the output plus terminal of rectifier bridge, the inverting input of comparator A4 obtains reference voltage V min by a reference circuit, this reference circuit comprises resistance R 16, resistance R 17 and three utmost point thyristor VS, the negative electrode that connects three utmost point thyristor VS after one end crosstalk resistance R17 of resistance R 16, the other end of resistance R 16 connects the negative electrode of diode D4, the plus earth of three utmost point thyristor VS, the gate pole of three utmost point thyristor VS is connected with inverting input.
As shown in Figure 2, circuit theory is as follows:
First stage, when the output plus terminal voltage of rectifier bridge at 1/3 when following of rated voltage (220V) scope, the reference voltage Vref of the amplifier A1 in-phase input end in constant-current control circuit 1 is greater than the voltage of its inverting input, therefore its output output high level, to the grid of nmos pass transistor VT1, makes nmos pass transistor VT1 in conducting state.This stage, the 1st group of light-emitting diodes pipe string 1 was in running order, and the 2nd group of light-emitting diodes pipe string 2 and the 3rd group of light-emitting diodes pipe string 3 are in non operating state.
Second stage, when the output plus terminal voltage of rectifier bridge rated voltage (220V) scope 1/3 to 2/3 the time, the reference voltage Vref of the amplifier A1 in-phase input end in constant-current control circuit 1 is less than the voltage of its inverting input, therefore its output output low level, to the grid of nmos pass transistor VT1, makes nmos pass transistor VT1 in cut-off state.In like manner, the nmos pass transistor VT2 in constant-current control circuit 2 is in conducting state.This stage the 1st group of light-emitting diodes pipe string 1 and the 2nd group of light-emitting diodes pipe string 2 are in running order, and the 3rd group of light-emitting diodes pipe string 3 is in non operating state.
Phase III, when the output plus terminal voltage of rectifier bridge be greater than rated voltage (220V) scope 2/3 the time, nmos pass transistor VT1, VT2 cut-off, VT3 conducting.This stage the 1st group of light-emitting diodes pipe string 1, the 2nd group of light-emitting diodes pipe string 2 and 3 groups of light-emitting diodes pipe strings 3 are all in running order.
Above-described the utility model execution mode, do not form the restriction to the utility model protection range.Any modification of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in claim protection range of the present utility model.
Claims (6)
1. a segmented circuit of power factor correction is characterized in that: comprise rectifier bridge, n group light-emitting diodes pipe string, and n constant current control unit; Comprise at least two light-emitting diodes in every group of light-emitting diodes pipe string, all be connected thereto the negative electrode of one group of light-emitting diodes pipe string from the 2nd group of anode to n group light-emitting diodes pipe string, form one by the 1st group of series circuit be connected to form in order to n group light-emitting diodes pipe string; Two of described rectifier bridge input termination alternating voltages, the output plus terminal of described rectifier bridge connects the anode of the 1st group of light-emitting diodes pipe string, all the be coupled constant current control unit of a correspondence of the negative electrode of every group of light-emitting diodes pipe string;
The test side of described constant current control unit connects the output plus terminal of described rectifier bridge, and the input of described constant current control unit connects the negative electrode of corresponding light-emitting diodes pipe string, the output head grounding of described constant current control unit.
2. segmented circuit of power factor correction according to claim 1, is characterized in that, described constant current control unit comprises first, second divider resistance and amplifier, switching tube, described the first divider resistance is connected with the second divider resistance, the test side of the described constant current control unit of another termination of described the first divider resistance, the other end ground connection of described the second divider resistance, the in-phase input end of described amplifier connects reference voltage, the inverting input of described amplifier is connected on the tie point of described the first divider resistance and the second divider resistance, the first end of the described switching tube of output termination of described amplifier, the input of the described constant current control unit of the second termination of described switching tube, the output of the described constant current control unit of the 3rd termination of described switching tube.
3. segmented circuit of power factor correction according to claim 2, is characterized in that, the 3rd end of described switching tube is by current-limiting resistance ground connection.
4. according to the described segmented circuit of power factor correction of claim 2 or 3, it is characterized in that, described switching tube is nmos pass transistor, and the first end of described switching tube is grid, and the second end of described switching tube is drain electrode, and the 3rd end of described switching tube is source electrode.
5. according to claim 1,2 or 3 described segmented circuit of power factor correction, it is characterized in that, also be connected with a under-voltage locking unit between n constant current control unit and ground, this voltage lock cell comprises the 3rd divider resistance, the 4th divider resistance, comparator and under-voltage switching tube, described the 3rd divider resistance is connected with the 4th divider resistance, the other end of described the 3rd divider resistance connects the output plus terminal of described rectifier bridge, the other end ground connection of described the 4th divider resistance, the in-phase input end of described comparator is connected on the tie point between described the 3rd divider resistance and the 4th divider resistance, the inverting input of described comparator connects reference voltage, the output of described comparator is connected with the first end of described under-voltage switching tube, the second end of described under-voltage switching tube connects the output of n constant current control unit, the 3rd end ground connection of described under-voltage switching tube.
6. segmented circuit of power factor correction according to claim 5, it is characterized in that, described under-voltage switching tube is nmos pass transistor, and the first end of described under-voltage switching tube is grid, the second end of described under-voltage switching tube is drain electrode, and the 3rd end of described under-voltage switching tube is source electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320433194.5U CN203377779U (en) | 2013-07-19 | 2013-07-19 | Sectional-type power factor correction circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320433194.5U CN203377779U (en) | 2013-07-19 | 2013-07-19 | Sectional-type power factor correction circuit |
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| Publication Number | Publication Date |
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| CN203377779U true CN203377779U (en) | 2014-01-01 |
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| CN201320433194.5U Expired - Fee Related CN203377779U (en) | 2013-07-19 | 2013-07-19 | Sectional-type power factor correction circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107318197A (en) * | 2017-08-17 | 2017-11-03 | 无锡市益明光电有限公司 | A kind of LED multi-path current balance circuit |
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2013
- 2013-07-19 CN CN201320433194.5U patent/CN203377779U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107318197A (en) * | 2017-08-17 | 2017-11-03 | 无锡市益明光电有限公司 | A kind of LED multi-path current balance circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140101 Termination date: 20160719 |
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| CF01 | Termination of patent right due to non-payment of annual fee |