CN203934041U - A kind of light fixture and LED drive unit thereof - Google Patents
A kind of light fixture and LED drive unit thereof Download PDFInfo
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- CN203934041U CN203934041U CN201420221297.XU CN201420221297U CN203934041U CN 203934041 U CN203934041 U CN 203934041U CN 201420221297 U CN201420221297 U CN 201420221297U CN 203934041 U CN203934041 U CN 203934041U
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The utility model belongs to LED illumination control field, relates in particular to a kind of light fixture and LED drive unit thereof.The LED drive unit that the utility model provides, except rectifier bridge, electric capacity and adjustable LED load, also comprises Logic control module and the charge-discharge modules joining with it, voltage detection module and NMOS pipe.In real work, Logic control module is the result to the voltage detecting of the NMOS pipe drain electrode of LED load cathode end according to voltage detection module, at the voltage of NMOS pipe drain electrode during higher than default high threshold, charge closing circuit, the voltage maintaining on electric capacity is specific voltage.When rectifier output voltage is during lower than the voltage (high threshold) at capacitor C 1 two ends, capacitor C 1 by the discharge circuit in charge-discharge modules to LED load discharge.So, under the control of Logic control module, the charging sequential of accurate control capacitance and electric discharge sequential, to realize the higher drive efficiency of whole LED drive unit.
Description
Technical field
The utility model belongs to LED illumination control field, relates in particular to a kind of light fixture and LED drive unit thereof.
Background technology
Traditional high-voltage linear LED drive circuit is as shown in Figure 1: high-voltage linear LED drives chip to connect with LED lamp string, and a large electric capacity of two outputs parallel connections of rectifier bridge is used for voltage stabilizing, to reduce the fluctuation of rectifier bridge output voltage.As shown in Figure 2, particularly, waveform is above civil power input exchange signal to its drive waveforms figure, and drive waveforms is below rectification output waveform figure; And solid line is partly the drive waveforms figure of line voltage when lower, dotted portion is the drive waveforms figure of line voltage when higher.As seen from the figure, at T2, in the time period, civil power input is to capacitor C 1 charging, and the voltage of rectification output raises along with the increase of the absolute value of line voltage; At T1, T3, in the time period, the voltage at capacitor C 1 two ends is higher than line voltage, and 1 pair of LED lamp string of capacitor C discharges, the voltage slow decreasing in capacitor C 1.
Solid line in comparison diagram and dotted line can draw, when line voltage raises, the driving voltage of LED lamp string is whole certain voltage that raises thereupon also, and this part voltage equals the added value of civil power input range absolute value.Because wick is that constant current drives, so the voltage at the two ends of lamp string is constant, this part voltage increasing is just applied directly to high-voltage linear LED and drives on chip, power consumption on chip is sharply increased, because be activated the restriction of chip package heat-sinking capability, high-voltage linear LED drives chip cannot realize high-power output at all.
Utility model content
In view of this, first the purpose of this utility model is to provide a kind of LED drive unit, to solve the lower technical problem of drive efficiency of existing LED drive circuit.
To achieve these goals, the technical solution adopted in the utility model is:
A LED drive unit, comprises rectifier bridge, capacitor C 1 and adjustable LED load, and as improvement, described LED drive unit also comprises: Logic control module and andlogic control module is joined respectively charge-discharge modules, voltage detection module and NMOS pipe N1;
Described charge-discharge modules is attempted by between two outputs of described rectifier bridge after connecting with described capacitor C 1, drain electrode and the LED load of described NMOS pipe N1 are joined, the grid of described NMOS pipe N1 is controlled Logic control module described in termination, and the drain electrode of NMOS pipe N1 and described LED load connects end altogether described in the input termination of described voltage detection module; Logic control module described in the output termination of described voltage detection module;
The work of charge-discharge circuit module described in the signal controlling that described Logic control module is exported according to described voltage detection module: when rectification output is charged to described capacitor C 1, if the voltage of described NMOS pipe N1 drain electrode reaches high threshold, the capacitor charging termination signal OVC of described voltage detection module output is effective high level, and described Logic control module is controlled charge closing circuit.
On the other hand, the purpose of this utility model is also to provide a kind of LED light fixture.This LED light fixture has comprised above-mentioned LED drive unit.
The LED light fixture that the utility model provides and LED drive unit thereof, result according to voltage detection module to the voltage detecting of the NMOS pipe N1 drain electrode of LED load cathode end, voltage on control capacitance C1 is no more than default high threshold, to improve the drive efficiency of LED drive unit.Particularly, under the control of Logic control module, civil power input is charged to C1 by the charging circuit in charge-discharge modules through rectification output.When the capacitor charging termination signal OVC of voltage detection module output is low level, the voltage of NMOS pipe N1 drain electrode is not while reaching high threshold, the charging circuit in charge-discharge modules is opened; Otherwise charging circuit cuts out.Like this, can be when rectifier output voltage be too high, charge closing circuit, the voltage maintaining in capacitor C 1 is specific voltage (being the high threshold of predeterminated voltage).When rectifier output voltage is during lower than the voltage (high threshold) at capacitor C 1 two ends, capacitor C 1 by the discharge circuit in charge-discharge modules to LED load discharge.In sum, under the control of Logic control module, the charging sequential of accurate control capacitance C1 and electric discharge sequential, to realize the higher drive efficiency of whole LED drive unit.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the linear LED drive circuit of prior art mesohigh;
Drive waveforms figure when Fig. 2 is circuit working shown in Fig. 1;
Fig. 3 is the structured flowchart of the LED drive unit that provides of the utility model one embodiment;
Fig. 4 is the structured flowchart of the LED drive unit that provides of another embodiment of the utility model;
Fig. 5 is the utility model typical drive waveforms figure in LED drive unit when work of providing;
Fig. 6 be in the drive unit of LED shown in Fig. 3 charge-discharge modules can embodiment schematic diagram;
Fig. 7 be in the drive unit of LED shown in Fig. 4 charge-discharge modules can embodiment schematic diagram.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage 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.
Fig. 3 is the structured flowchart of the LED drive unit that provides of the utility model embodiment; For convenience of explanation, only show the part relevant to the present embodiment, as shown in the figure:
A kind of LED drive unit, AC is connected with AC power, comprise rectifier bridge B1, capacitor C 1 and adjustable LED load 100, as improvement, this LED drive unit also comprises: Logic control module 200 and the charge-discharge modules 300 joining with it respectively, voltage detection module 400 and NMOS pipe N1; Wherein, charge-discharge modules 300 is attempted by after connecting with capacitor C 1 between two outputs of rectifier bridge B1, the output of the control termination Logic control module 200 of charge-discharge modules 300, drain electrode and the LED load 100 of NMOS pipe N1 are joined, the grid of NMOS pipe N1 is controlled termination Logic control module 200, the drain electrode of the input termination NMOS pipe N1 of voltage detection module 400 and LED load 100 connect altogether end; The output termination Logic control module 200 of voltage detection module 400.
In practical work process, voltage detection module 400 is by detecting the voltage height of the NMOS pipe N1 drain electrode of LED load 100 cathode end, and output overvoltage signal OVH, under-voltage signal OVL and/or capacitor charging termination signal OVC are to Logic control module 200.Particularly, under the control of Logic control module 200, civil power input is charged to capacitor C 1 by the charging circuit in charge-discharge modules 300 through rectification output, when the capacitor charging termination signal OVC of voltage detection module 400 outputs is low level, be the voltage of NMOS pipe N1 drain electrode while also not reaching default high threshold, the charging circuit in charge-discharge modules 300 continues to open; When the voltage of NMOS pipe N1 drain electrode reaches high threshold, the capacitor charging termination signal OVC of voltage detection module 400 outputs is just effective high level, and Logic control module 200 is at once according to this signal controlling charge closing circuit.Like this, Logic control module 200 externally power network fluctuation, alternating current voltage increases when a lot, still can be when rectifier output voltage be too high charge closing circuit, ceiling voltage in capacitor C 1 is maintained specifically on high threshold.With prior art, compare, make to be applied to the voltage and the dissipation power consumption that drive on chip and all diminish, realize high efficiency driving.
On the other hand, when rectifier output voltage is during lower than the voltage (high threshold) at capacitor C 1 two ends, capacitor C 1 by the discharge circuit in charge-discharge modules to LED load 100 electric discharges.Further, when the upper limit (being the high threshold of predeterminated voltage) of capacitor C 1 charging voltage is determined, the electric current that the lower limit of capacitor C 1 discharge voltage is crossed by size and the lamp crossfire of electric capacity itself determines, at the minimum voltage that guarantees capacitor C 1, being greater than lamp string lights under the prerequisite of voltage, by control capacittance size, can adapt to the application demand of different lamp string streams.
To sum up, the LED drive unit providing according to the utility model embodiment, under the control of Logic control module 200, accurately the charging sequential of control capacitance C1 and electric discharge sequential, realize the greater efficiency of whole LED drive unit.
When specific implementation, the LED drive unit that the utility model embodiment provides can also be as shown in Figure 4.Referring to Fig. 4, different from the LED drive unit shown in Fig. 3, there is exchange with the position of capacitor C 1 in charge-discharge modules 300.Although charge-discharge modules 300 and capacitor C 1 have been exchanged to position, the operation principle of whole device is the same, at this, just repeats no more.
It is emphasized that the LED load 100 that the utility model embodiment mentions is generally adjustable LED lamp string.LED load 100 shown in Fig. 3 and Fig. 4 is one preferred embodiment.
Concrete, LED load 100 shown in Fig. 3 and Fig. 4 is connected in series formation by LED1～LEDn+1, and LED1～LEDn is in parallel with PMOS pipe P1～Pn respectively, and the grid control end of PMOS pipe P1～Pn connects respectively described Logic control module 200, and the cathode end of LEDn+1 connects the drain electrode of NMOS pipe N1.Logic control module 200 is according to overvoltage signal OVH and the under-voltage signal OVL of voltage detection module 400 outputs that receive, control the on off state of PMOS pipe P1～Pn, the quantity that changes the LED lamp string of lighting with this, approaches the voltage of voltage sum in LED load 100 and rectifier output voltage or capacitor C 1 electric discharge output.
When the overvoltage signal OVH of voltage detection module 400 outputs is high level, the overtension of the drain electrode of NMOS pipe N1 is described, Logic control module 200 will change the on off state of PMOS pipe P1～Pn, makes more lamp string light, carry a part of voltage, thereby makes overvoltage signal OVH become 0; When under-voltage signal OVL is high level, the brownout of the drain electrode of NMOS pipe N1 is described, Logic control module 200 will change the on off state of PMOS pipe P1～Pn, lamp string is still less lighted, thereby made under-voltage signal OVL become 0.
The operation principle of LED drive unit the utility model embodiment being provided below by the drive waveforms figure under operating state as shown in Figure 5 further describes.Referring to Fig. 5, sinusoidal waveform is above civil power input waveform, drive waveforms figure when waveform is below the LED drive unit work shown in Fig. 3 or Fig. 4.In the civil power of take input waveform, the drive waveforms shown in solid line is example.
Two horizontal dotted lines in drive waveforms figure are respectively Vth1 and Vth2.Wherein, Vth1 represents the minimum voltage of capacitor C 1 electric discharge, and the magnitude of voltage summation that its value is generally the minimum lamp string of lighting in design is added the minimum voltage value (being mainly the conducting voltage of NMOS pipe N1) driving on chip; Vth2 represents the ceiling voltage of capacitor C 1 charging, i.e. high threshold, and magnitude of voltage summation when its value is generally LED lamp string and all lights in design, adds certain voltage (conventionally getting between 6V～50V).T2 is in the drawings in the time period, rectifier output voltage at Vth1 between Vth2, now capacitor C 1 is charged, Logic control module 200 is according to the overvoltage signal OVH and the under-voltage signal OVL that receive simultaneously, control the break-make of PMOS pipe P1～Pn, light the LED lamp string of suitable quantity, make voltage sum and the rectifier output voltage of the LED lamp string lighted substantially approaching; At T3, in the time period, rectifier output voltage is higher than Vth2, and Logic control module 200 turn-offs charging circuit, stops capacitor C 1 charging; Meanwhile, Logic control module 200, according to the overvoltage signal OVH, the under-voltage signal OVL that receive, is controlled the break-make of PMOS pipe P1～Pn, lights the LED lamp string of suitable quantity; In T4 and T1 time period, the absolute value of mains input voltage is less than the magnitude of voltage at capacitor C 1 two ends, and 1 pair of LED lamp string of capacitor C discharges.Due to capacitor C 1 electric discharge, rectifier output voltage constantly declines, and Logic control module 200 will, according to the overvoltage signal OVH receiving, under-voltage signal OVL, be controlled the LED lamp string of lighting suitable quantity equally.
Like this, only at T3 in the time period, due to rectifier output voltage higher (higher than high threshold Vth2), now the drive efficiency of whole LED drive unit is minimum; And in the time period, because rectifier output voltage is between Vth1 and Vth2, can keep very high drive efficiency at T1, T2 and T4.Generally, suppose that electric frequency is 50Hz, the duration of T3 time period is 2mS left and right, only account for 20% of the whole cycle, thereby the efficiency of T3 time period can reduce by 80% to the impact of drive efficiency in the whole cycle, so can realize high drive efficiency.
Drive waveforms when waveform shown in dotted lines in Figure 5 is line voltage rising.As seen from the figure, after line voltage raises, the duration of T3 time period is elongated, and T1, T2, the duration of T4 time period compare and shorten; T3 in the time period efficiency of system lower, very high in the efficiency of T1, T2, T4 system in the time period.Compare with traditional high-voltage linear constant current scheme, rectifier output voltage is only at T3 in the time period, lifting more, and at T1, T2, T4 in the time period, rectifier output voltage changes very little, thereby can effectively weaken the impact that input line voltage raises on efficiency, in wider mains input voltage excursion, keep higher drive efficiency.
Further, as a preferred embodiment, the LED drive unit that the utility model provides can also comprise an adjustable current source I1.Adjustable current source I1 is arranged between the source electrode and ground of NMOS pipe N1.During the number change of the LED lamp string of lighting when Logic control module 200, the output of dynamic adjustments adjustable current source I1.General, can adjust according to LED lamp string total quantity and the proportionate relationship of the LED lamp string of lighting quantity the output of adjustable current source I1, when the LED lamp string quantity being lit reduces, the electric current (being no longer that common constant current drives) that increases LED lamp cluster of lamps, ornamental core, the output size that can maintain like this luminous flux is approximate constant.
Fig. 6 shows three kinds of charge-discharge modules 300 in the drive unit of LED shown in Fig. 3 can embodiment.For convenience of explanation, only show the part being directly connected with charge-discharge modules 300.Specifically as shown in the figure:
In Fig. 6 a, charge-discharge modules 300 adopts NMOS pipe Nn as charging and discharging fulgurite; The grid of NMOS pipe Nn connects Logic control module 200, and the drain electrode of NMOS pipe Nn connects capacitor C 1, the source ground of NMOS pipe Nn.During charging, Logic control module 200 output high level are opened NMOS pipe to the grid of NMOS pipe Nn, and electric current flows through the raceway groove of NMOS pipe to ground; Or Logic control module 200 output low levels are to the gate turn-off NMOS pipe of NMOS pipe Nn, making cannot be by NMOS pipe to capacitor C 1 charging.During electric discharge, the diode current flow of NMOS pipe Nn parasitism, capacitor C 1 electric discharge.
In Fig. 6 b, charge-discharge modules 300 comprises NMOS pipe Nn and is connected in parallel on the backward diode D1 between the drain-source utmost point of NMOS pipe Nn; The anode of backward diode D1 connects the source electrode of NMOS pipe Nn, and the negative electrode of backward diode D1 connects the drain electrode of NMOS pipe Nn, and the grid of NMOS pipe Nn connects Logic control module 200, and the drain electrode of NMOS pipe Nn connects capacitor C 1, the source ground of NMOS pipe Nn.Compare with Fig. 6 a, a backward diode D1 in parallel between the drain-source of NMOS pipe Nn, in the time of can eliminating electric discharge on from its parasitic diode overcurrent on the unlatching of NMOS pipe itself the impact of turn-off characteristic.
In Fig. 6 c, charge-discharge modules 300 is on the basis of Fig. 6 b, has increased by one and has been connected to the drain electrode of NMOS pipe Nn and the diode D2 between capacitor C 1; The anode of diode D2 connects capacitor C 1, and the negative electrode of diode D2 connects the drain electrode of NMOS pipe Nn.Charging circuit as shown in Fig. 6 c consists of NMOS pipe Nn and diode D2, and discharge circuit consists of backward diode D1; Particularly, during charging, Logic control module 200 output high level are opened NMOS pipe to the grid of NMOS pipe Nn, and backward diode D1 oppositely ends, and electric current flows through diode D2 and NMOS manages Nn to ground; During electric discharge, diode D2 oppositely ends, and electric current flows through backward diode D1.
In addition, three kinds shown in Fig. 6 are in can embodiment, between the source electrode of NMOS pipe Nn and ground, can be connected in series a current-limiting resistance R1 again, the rush of current when discharging and recharging gently.
Fig. 7 shows three kinds of charge-discharge modules 300 in the drive unit of LED shown in Fig. 4 can embodiment.Same, for convenience of explanation, only show the part being directly connected with charge-discharge modules 300.Specifically as shown in the figure:
In Fig. 7 a, charge-discharge modules 300 adopts PMOS pipe Pm as charging and discharging fulgurite; The grid of PMOS pipe Pm connects Logic control module 200, and the source electrode of PMOS pipe Pm connects the output of rectifier bridge B1, and the drain electrode of PMOS pipe Pm connects capacitor C 1.During charging, Logic control module 200 output low levels are opened PMOS pipe to the grid of PMOS pipe Pm, and electric current flows through the raceway groove of PMOS pipe to ground; During electric discharge, the diode current flow of PMOS pipe Pm parasitism, capacitor C 1 electric discharge.
In Fig. 7 b, charge-discharge modules 300 comprises PMOS pipe Pm and is connected in parallel on the backward diode D3 between the drain-source utmost point of PMOS pipe Pm; The grid of PMOS pipe Pm connects Logic control module 200, and the source electrode of PMOS pipe Pm connects the output of rectifier bridge B1, and the drain electrode of PMOS pipe Pm connects capacitor C 1.Similarly, charging circuit is PMOS pipe Pm, and discharge circuit is backward diode D3.Compare with Fig. 7 a, a backward diode D3 in parallel between the drain-source of PMOS pipe Pm, in the time of can eliminating electric discharge on from its parasitic diode overcurrent on the unlatching of PMOS pipe itself the impact of turn-off characteristic.
In Fig. 7 c, on the basis of Fig. 7 b, increased by one and be connected to the drain electrode of PMOS pipe Pm and the diode D4 between capacitor C 1; The negative electrode of diode D4 connects capacitor C 1, and the anode of diode D4 connects the drain electrode of PMOS pipe Pm.Charging circuit consists of PMOS pipe Pm and diode D4, and discharge circuit consists of backward diode D3.
NMOS pipe Nn is similar with adopting in Fig. 6, in the charge-discharge modules 300 that Fig. 7 provides, between the PMOS pipe source electrode of Pm and the output of rectifier bridge B1, can be connected in series a current-limiting resistance R1 equally again.
Finally, the utility model embodiment also provides a kind of LED light fixture, and described LED light fixture comprises the LED drive unit under arbitrary form as previously mentioned.
The LED light fixture that the utility model provides and LED drive unit thereof, result according to voltage detection module to the voltage detecting of the NMOS pipe N1 drain electrode of LED load cathode end, voltage on control capacitance C1 is no more than default high threshold, to improve the drive efficiency of LED drive unit.Particularly, under the control of Logic control module, civil power input is charged to C1 by the charging circuit in charge-discharge modules through rectification output.When the capacitor charging termination signal OVC of voltage detection module output is low level, the voltage of NMOS pipe N1 drain electrode is not while reaching high threshold, the charging circuit in charge-discharge modules is opened; Otherwise charging circuit cuts out.Like this, can be when rectifier output voltage be too high, charge closing circuit, the voltage maintaining in capacitor C 1 is specific voltage (being the high threshold of predeterminated voltage).When rectifier output voltage is during lower than the voltage (high threshold) at capacitor C 1 two ends, capacitor C 1 by the discharge circuit in charge-discharge modules to LED load discharge.In sum, under the control of Logic control module, the charging sequential of accurate control capacitance C1 and electric discharge sequential, to realize the higher drive efficiency of whole LED drive unit.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, although the utility model has been carried out to more detailed explanation with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified or part technical characterictic is wherein equal to replacement.All any modifications 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 protection range of the present utility model.
Claims (11)
1. a LED drive unit, comprises rectifier bridge, capacitor C 1 and adjustable LED load, it is characterized in that, described LED drive unit also comprises: Logic control module and the charge-discharge modules joining with it respectively, voltage detection module and NMOS pipe N1;
Described charge-discharge modules is attempted by between two outputs of described rectifier bridge after connecting with described capacitor C 1, drain electrode and the LED load of described NMOS pipe N1 are joined, the grid of described NMOS pipe N1 is controlled Logic control module described in termination, and the drain electrode of NMOS pipe N1 and described LED load connects end altogether described in the input termination of described voltage detection module; Logic control module described in the output termination of described voltage detection module;
The work of charge-discharge circuit module described in the signal controlling that described Logic control module is exported according to described voltage detection module: when rectification output is charged to described capacitor C 1, if the voltage of described NMOS pipe N1 drain electrode reaches high threshold, the capacitor charging termination signal OVC of described voltage detection module output is effective high level, and described Logic control module is controlled charge closing circuit.
2. LED drive unit as claimed in claim 1, is characterized in that, described LED load comprises adjustable LED lamp string; Described LED lamp string is in series by LED1～LEDn+1, and LED1～LEDn is in parallel with PMOS pipe P1～Pn respectively, the grid control end of described PMOS pipe P1～Pn connects respectively described Logic control module, and the cathode end of described LEDn+1 connects the drain electrode of described NMOS pipe N1;
Described Logic control module is according to overvoltage signal OVH and the under-voltage signal OVL of the voltage detection module output receiving, control the on off state of described PMOS pipe P1～Pn to change the LED lamp string quantity of lighting, make the voltage sum in described LED load approaching with the voltage of rectification output or capacitor C 1 electric discharge output.
3. LED drive unit as claimed in claim 2, is characterized in that, described LED drive unit also comprises that one is connected to the source electrode of described NMOS pipe N1 and the adjustable current source between ground;
Described Logic control module is adjusted the output of described adjustable current source according to LED lamp string total quantity and the proportionate relationship of the LED lamp string quantity lighted, constant to maintain the size of luminous flux.
4. LED drive unit as claimed in claim 1, is characterized in that, described charge-discharge modules adopts NMOS pipe Nn as charging and discharging fulgurite;
The grid of described NMOS pipe Nn connects described Logic control module, and the drain electrode of described NMOS pipe Nn connects described capacitor C 1, the source ground of described NMOS pipe Nn.
5. LED drive unit as claimed in claim 1, is characterized in that, described charge-discharge modules comprises NMOS pipe Nn and is connected in parallel on the backward diode D1 between the drain-source utmost point of described NMOS pipe Nn;
The anode of described backward diode D1 connects the source electrode of described NMOS pipe Nn, the negative electrode of described backward diode D1 connects the drain electrode of described NMOS pipe Nn, the grid of described NMOS pipe Nn connects described Logic control module, and the drain electrode of described NMOS pipe Nn connects described capacitor C 1, the source ground of described NMOS pipe Nn.
6. LED drive unit as claimed in claim 5, is characterized in that, described charge-discharge modules also comprises that one is connected to the drain electrode of described NMOS pipe Nn and the diode D2 between described capacitor C 1;
The anode of described diode D2 connects described capacitor C 1, and the negative electrode of described diode D2 connects the drain electrode of described NMOS pipe Nn.
7. LED drive unit as claimed in claim 1, is characterized in that, described charge-discharge modules adopts PMOS pipe Pm as charging and discharging fulgurite;
The grid of described PMOS pipe Pm connects described Logic control module, and the source electrode of described PMOS pipe Pm connects the output of described rectifier bridge, and the drain electrode of described PMOS pipe Pm connects described capacitor C 1.
8. LED drive unit as claimed in claim 1, is characterized in that, described charge-discharge modules comprises PMOS pipe Pm and is connected in parallel on the backward diode D3 between the drain-source utmost point of described PMOS pipe Pm;
The grid of described PMOS pipe Pm connects described Logic control module, and the source electrode of described PMOS pipe Pm connects the output of described rectifier bridge, and the drain electrode of described PMOS pipe Pm connects described capacitor C 1.
9. LED drive unit as claimed in claim 8, is characterized in that, described charge-discharge modules also comprises that one is connected to the drain electrode of described PMOS pipe Pm and the diode D4 between described capacitor C 1;
The anode of described diode D4 connects the drain electrode of described PMOS pipe Pm, and the negative electrode of described diode D4 connects described capacitor C 1.
10. the LED drive unit as described in claim 4-9 any one, is characterized in that, described charge-discharge modules also comprises that one is serially connected in the current-limiting resistance R1 on metal-oxide-semiconductor source electrode.
11. 1 kinds of LED light fixtures, is characterized in that, described LED light fixture comprises the LED drive unit as described in claim 1-10 any one.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420221297.XU CN203934041U (en) | 2014-04-30 | 2014-04-30 | A kind of light fixture and LED drive unit thereof |
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| CN201420221297.XU CN203934041U (en) | 2014-04-30 | 2014-04-30 | A kind of light fixture and LED drive unit thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105813273A (en) * | 2016-05-12 | 2016-07-27 | 重庆四联光电科技有限公司 | Method and device for preventing lamp group from over-voltage and under-voltage working and lighting device |
| CN107896395A (en) * | 2016-10-04 | 2018-04-10 | 沛亨半导体股份有限公司 | Integrated circuit and its control method for AC light-emitting diode lamp tool |
-
2014
- 2014-04-30 CN CN201420221297.XU patent/CN203934041U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105813273A (en) * | 2016-05-12 | 2016-07-27 | 重庆四联光电科技有限公司 | Method and device for preventing lamp group from over-voltage and under-voltage working and lighting device |
| CN105813273B (en) * | 2016-05-12 | 2019-06-18 | 重庆四联光电科技有限公司 | The method, apparatus and lighting apparatus of a kind of anti-lamp group over-voltage and under-voltage work |
| CN107896395A (en) * | 2016-10-04 | 2018-04-10 | 沛亨半导体股份有限公司 | Integrated circuit and its control method for AC light-emitting diode lamp tool |
| CN107896395B (en) * | 2016-10-04 | 2019-07-16 | 沛亨半导体股份有限公司 | Integrated circuit and its control method for AC light-emitting diode lamp tool |
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