CN102281688A - Drive circuit for light emitting diode - Google Patents
Drive circuit for light emitting diode Download PDFInfo
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- CN102281688A CN102281688A CN2011102798544A CN201110279854A CN102281688A CN 102281688 A CN102281688 A CN 102281688A CN 2011102798544 A CN2011102798544 A CN 2011102798544A CN 201110279854 A CN201110279854 A CN 201110279854A CN 102281688 A CN102281688 A CN 102281688A
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Abstract
The invention aims to provide a drive circuit for a light emitting diode for narrowing the output voltage range of a pulse voltage Vin. In order to fulfill the aim, the invention provides three ways. The first way comprises the following steps of: increasing a second power source V2, serially connecting the second power source V2 with a second capacitor C2 and connecting a second group of light emitting diodes LEDS2 to two ends of a series circuit; the second way comprises the following steps of: increasing a first power source V1, serially connecting the first power source V1 with a first capacitor C1 and connecting a first group of light emitting diodes LEDS1 to two ends of the series circuit; and the third way comprises the following steps of: simultaneously increasing the second power source V2 and the first power source V1, serially connecting the second power source V2 with the second capacitor C2, serially connecting the first power source V1 with the first capacitor C1 and respectively connecting the second group of light emitting diodes LEDS2 and the first group of light emitting diodes LEDS1 to two ends of the series circuit.
Description
Technical field
The present invention relates to LED driving circuit.
Background technology
Light-emitting diode (Light Emitting Diode, LED).
In the prior art, the circuit that has driving multichannel LED as shown in Figure 1, this circuit can make every road LED electric current absolute value equate, but the output voltage that requires pulse voltage Vin is the voltage summation of first group of LED S1 and second group of LED S2, and higher pulse voltage Vin can cause insulation fault, efficient reduction, heating phenomenon etc.
Summary of the invention
Main purpose of the present invention is to provide the LED driving circuit of the output voltage range that reduces pulse voltage Vin.
For reaching above-mentioned purpose, the present invention proposes:
Mode one: increase a second source V2, second source V2 connects with second capacitor C 2, and second group of LED S2 is connected the two ends of above-mentioned series circuit;
Mode two: increase by the first power supply V1, the first power supply V1 connects with first capacitor C 1, and first group of LED S1 is connected the two ends of above-mentioned series circuit;
Mode three: increase the second source V2 and the first power supply V1 simultaneously, second source V2 and 2 series connection of second capacitor C, the first power supply V1 and the series connection of first capacitor C 1, second group of LED S2 and first group of LED S1 are connected to the two ends of above-mentioned series circuit.
This circuit comprises: pulse voltage Vin, capacitor C 0, the first capacitor C 1, the second capacitor C 2, the 9th capacitor C 9, the first diode D1, the second diode D2, the 9th diode D9, first group of LED S1 and second group of LED S2, second source V2, the first power supply V1.
Its connected mode one is: pulse voltage Vin connects with capacitor C 0, the other end of capacitor C 0 connects the first diode D1 and the second diode D2 simultaneously, the first diode D1 connects with first capacitor C 1, the second diode D2 connects with second capacitor C 2, second capacitor C 2 is connected with second source V2, the anode of first group of LED S1 is connected first capacitor C, 1 upper end, the negative electrode of first group of LED S1 is connected first capacitor C, 1 lower end, the negative electrode of second group of LED S2 is connected second capacitor C, 2 upper ends, the anode of second group of LED S2 is connected second source V2 lower end, with reference to figure 2.
Its connected mode two is: pulse voltage Vin connects with capacitor C 0, the other end of capacitor C 0 connects the first diode D1 and the second diode D2 simultaneously, the first diode D1 connects with first capacitor C 1, first capacitor C 1 is connected with the first power supply V1, the second diode D2 connects with second capacitor C 2, the anode of first group of LED S1 is connected first capacitor C, 1 upper end, the negative electrode of first group of LED S1 is connected the first power supply V1 lower end, the negative electrode of second group of LED S2 is connected second capacitor C, 2 upper ends, the anode of second group of LED S2 is connected second capacitor C, 2 lower ends, with reference to figure 3.
Its connected mode three is: pulse voltage Vin connects with capacitor C 0, the other end of capacitor C 0 connects the first diode D1 and the second diode D2 simultaneously, the first diode D1 connects with first capacitor C 1, first capacitor C 1 is connected with the first power supply V1, the second diode D2 connects with second capacitor C 2, second capacitor C 2 is connected with second source V2, the anode of first group of LED S1 is connected first capacitor C, 1 upper end, the negative electrode of first group of LED S1 is connected the first power supply V1 lower end, the negative electrode of second group of LED S2 is connected second capacitor C, 2 upper ends, the anode of second group of LED S2 is connected second source V2 lower end, with reference to figure 4.
Described pulse voltage Vin, its output voltage comprises high level voltage and low level voltage, high level voltage be on the occasion of, low level voltage can be on the occasion of, negative value and zero, in traditional Switching Power Supply, and boost circuit for example, the buck circuit, the buck-boost circuit, Cuk circuit, Sepic circuit, the zeta circuit, in the Full-Bridge circuit, all there is this pulse voltage Vin in the Half-Bridge circuit.
Described capacitor C 0, be connected between the pulse voltage Vin and the first diode D1, capacitor C 0 is used to store the error voltage that the error current of first group of LED S1 and second group of LED S2 causes, this error voltage comprises the error that second source V2 and the first power supply V1 cause, the electric current absolute value of first group of LED S1 and second group of LED S2 is equated, when needing the electric current of limiting capacitance C0, capacitor C 0 two ends also can connect known current limiting element, resistance for example, inductance, this is connected to traditional circuit, repeats no more.
The described first diode D1, the second diode D2 all are connected with capacitor C 0, pulse voltage is become dc pulse voltage, when needs limit the electric current of the first diode D1, the second diode D2, the first diode D1, the second diode D2 two ends also can connect known buffer element, for example resistance, electric capacity, inductance, this is connected to traditional circuit, and does not change essence of the present invention, repeats no more.
Described first capacitor C 1, second capacitor C 2 are connected with the first diode D1, the second diode D2 respectively, dc pulse voltage is become smooth dc voltage, when needs limit the electric current of first capacitor C 1, second capacitor C 2, first capacitor C 1, second capacitor C, 2 two ends also can connect known current limiting element, for example resistance, inductance, this is connected to traditional circuit, repeats no more.
Described light-emitting diode group is made of at least 2 LED series connection, when needs detect the electric current of first group of LED S1 or second group of LED S2, can be at first group of LED S1 or second group of known current measuring element of LED S2 series connection, resistance for example, this is connected to traditional circuit, repeats no more.
The described second source V2 and the first power supply V1 connect with second capacitor C 2 and first capacitor C 1 respectively, and in comprising circuit system of the present invention, the second source V2 and the first power supply V1 can be from the voltages of having exported in the circuit system; The second source V2 and the first power supply V1 also can be obtained by pulse voltage Vin rectifying and wave-filtering, also can use the voltage of other existence, when needs limit the electric current of the first power supply V1, second source V2, the first power supply V1, second source V2 two ends also can connect known current limiting element, for example resistance, inductance, this is connected to traditional circuit, repeats no more.
Description of drawings
Fig. 1 is known LED driving circuit.
Fig. 2 is the preferred embodiment of the present invention one connected mode one.
Fig. 3 is the preferred embodiment of the present invention one connected mode two.
Fig. 4 is the preferred embodiment of the present invention one connected mode three.
Fig. 5 is the preferred embodiment of the present invention two.
Fig. 6 is the preferred embodiment of the present invention three.
Fig. 7 is the preferred embodiment of the present invention four.
Fig. 8 is the preferred embodiment of the present invention five.
Fig. 9 is the preferred embodiment of the present invention six.
Wherein, description of reference numerals is as follows:
LEDS1: first group of light-emitting diode, LEDS2: second group of light-emitting diode
Vin: pulse voltage
V1, V2, V3: first power supply, second source, the 3rd power supply
C0, C1, C2, C9: electric capacity, first electric capacity, second electric capacity, the 9th electric capacity
D1, D2, D9: first diode, second diode, the 9th diode
R1, R2, R3, R4: first resistance, second resistance, the 3rd resistance, the 4th resistance
S: switching device
L: inductor
T: transformer.
Embodiment
Some exemplary embodiments that embody feature of the present invention and advantage will be described in detail in the explanation of back segment.Be understood that the present invention can have various variations in different schemes, for example increase known current-limiting circuit, current sample, voltage buffer circuit, adopt the known filter circuit that is different from embodiment, rectification circuit etc., it does not all change essence of the present invention, and the usefulness that explanation wherein and accompanying drawing ought explain in itself, but not in order to restriction the present invention.
See also Fig. 2, it is the circuit diagram of two groups of LED driving circuit of the preferred embodiment of the present invention one connected mode one.As shown in Figure 2, two groups of LED driving circuit comprise pulse voltage Vin, capacitor C 0, the first diode D1, the second diode D2 at least, first capacitor C 1,2, the first groups of LED S1 of second capacitor C, second group of LED S2 and second source V2.
Pulse voltage Vin among Fig. 2 connects with capacitor C 0, capacitor C 0 other end connects the anode of the first diode D1 and the negative electrode of the second diode D2 simultaneously, the negative electrode of the first diode D1 is connected with first capacitor C 1, the anode of the second diode D2 is connected with second capacitor C 2, second capacitor C 2 is connected with second source V2, the anode of first group of LED S1 is connected first capacitor C, 1 upper end, the negative electrode of first group of LED S1 is connected first capacitor C, 1 lower end, the negative electrode of second group of LED S2 is connected second capacitor C, 2 upper ends, and the anode of second group of LED S2 is connected second source V2 lower end.
The operation principle of Fig. 2 is: when pulse voltage Vin output high level voltage, this high level voltage is through after the capacitor C 0, by becoming the positive direct-current pulse voltage after the first diode D1 rectification, this positive direct-current pulse voltage becomes positive smooth dc voltage after 1 filtering of first capacitor C, be used to drive first group of LED S1, this moment, capacitor C 0 two ends formed error voltage, and after the one-period, this error voltage comprises the error that second source V2 causes; When pulse voltage Vin output low level voltage, the error voltage of capacitor C 0 adds this low level voltage, by becoming negative dc pulse voltage after the second diode D2 rectification, this negative dc pulse voltage becomes negative smooth dc voltage after 2 filtering of second capacitor C, after the negative therewith smooth dc voltage series connection of second source V2, drive second group of LED S2, because second source V2 participates in driving second group of LED S2, so reduced the output voltage range of pulse voltage Vin, solved insulation and the heating problem of Vin thus.
See also Fig. 3, it is the circuit diagram of two groups of LED driving circuit of the preferred embodiment of the present invention one connected mode two, comprise pulse voltage Vin, capacitor C 0, the first diode D1, the second diode D2, first capacitor C 1,2, the first groups of LED S1 of second capacitor C, second group of LED S2 and the first power supply V1.
Pulse voltage Vin among Fig. 3 connects with capacitor C 0, capacitor C 0 other end connects the anode of the first diode D1 and the negative electrode of the second diode D2 simultaneously, the negative electrode of the first diode D1 is connected with first capacitor C 1, first capacitor C 1 is connected with the first power supply V1, the anode of the second diode D2 is connected with second capacitor C 2, the anode of first group of LED S1 is connected first capacitor C, 1 upper end, the negative electrode of first group of LED S1 is connected the first power supply V1 lower end, the negative electrode of second group of LED S2 is connected second capacitor C, 2 upper ends, and the anode of second group of LED S2 is connected second capacitor C, 2 lower ends.
The operation principle of Fig. 3 is: when pulse voltage Vin output high level voltage, this high level voltage is through after the capacitor C 0, by becoming the positive direct-current pulse voltage after the first diode D1 rectification, this positive direct-current pulse voltage becomes positive smooth dc voltage after 1 filtering of first capacitor C, after the positive therewith smooth dc voltage series connection of the first power supply V1, drive first group of LED S1, this moment, capacitor C 0 two ends formed error voltage, after the one-period, this error voltage comprises the error that the first power supply V1 causes; When pulse voltage Vin output low level voltage, the error voltage of capacitor C 0 adds this low level voltage, by becoming negative dc pulse voltage after the second diode D2 rectification, this negative dc pulse voltage becomes negative smooth dc voltage after 2 filtering of second capacitor C, be used to drive second group of LED S2, because the first power supply V1 participates in driving first group of LED S1, so reduced the output voltage range of pulse voltage Vin, solves insulation and the heating problem of Vin thus.
See also Fig. 4, it is the circuit diagram of two groups of LED driving circuit of the preferred embodiment of the present invention one connected mode three, comprise pulse voltage Vin, capacitor C 0, the first diode D1, the second diode D2, first capacitor C 1,2, the first groups of LED S1 of second capacitor C, second group of LED S2 and the first power supply V1 and second source V2.
Pulse voltage Vin among Fig. 4 connects with capacitor C 0, capacitor C 0 other end connects the anode of the first diode D1 and the negative electrode of the second diode D2 simultaneously, the negative electrode of the first diode D1 is connected with first capacitor C 1, first capacitor C 1 is connected with the first power supply V1, the anode of the second diode D2 is connected with second capacitor C 2, second capacitor C 2 is connected with second source V2, the anode of first group of LED S1 is connected first capacitor C, 1 upper end, the negative electrode of first group of LED S1 is connected the first power supply V1 lower end, the negative electrode of second group of LED S2 is connected second capacitor C, 2 upper ends, and the anode of second group of LED S2 is connected second source V2 lower end.
The operation principle of Fig. 4 is: when pulse voltage Vin output high level voltage, this high level voltage is through after the capacitor C 0, by becoming the positive direct-current pulse voltage after the first diode D1 rectification, this positive direct-current pulse voltage becomes positive smooth dc voltage after 1 filtering of first capacitor C, after the positive therewith smooth dc voltage series connection of the first power supply V1, drive first group of LED S1, this moment, capacitor C 0 two ends formed error voltage, after the one-period, this error voltage comprises the error that the second source V2 and the first power supply V1 cause; When pulse voltage Vin output low level voltage, the error voltage of capacitor C 0 adds this low level voltage, by becoming negative dc pulse voltage after the second diode D2 rectification, this negative dc pulse voltage becomes negative smooth dc voltage after 2 filtering of second capacitor C, after the negative therewith smooth dc voltage series connection of second source V2, drive second group of LED S2, because the first power supply V1 participates in driving first group of LED S1, second source V2 participates in driving second group of LED S2, so reduced the output voltage range of pulse voltage Vin, solved insulation and the heating problem of Vin thus.
See also Fig. 5, Fig. 5 is the preferred embodiment of the present invention two, comprise pulse voltage Vin, capacitor C 0, the first diode D1, the second diode D2, first capacitor C 1, second capacitor C 2, first group of LED S1, second group of LED S2 and the 9th diode D9 and the 9th capacitor C 9, compare the second source V2 among Fig. 2, the voltage of the second source V2 among Fig. 5 is obtained through 9 filtering of the 9th diode D9 rectification the 9th capacitor C by pulse voltage Vin.
Pulse voltage Vin among Fig. 5 connects with the 9th diode D9 and capacitor C 0 respectively, capacitor C 0 other end connects the anode of the first diode D1 and the negative electrode of the second diode D2 simultaneously, the negative electrode of the first diode D1 is connected with first capacitor C 1, the anode of the second diode D2 is connected with second capacitor C 2, the anode of first group of LED S1 is connected first capacitor C, 1 upper end, the negative electrode of first group of LED S1 is connected first capacitor C, 1 lower end, pulse voltage Vin is connected with the anode of the 9th diode D9, the negative electrode of the 9th diode D9 is connected with the 9th capacitor C 9, the 9th capacitor C 9 and 2 series connection of second capacitor C, the negative electrode of second group of LED S2 is connected second capacitor C, 2 upper ends, and the anode of second group of LED S2 is connected the 9th capacitor C 9 lower ends.
The operation principle of Fig. 5 is: when pulse voltage Vin output high level voltage, this high level voltage is through after the capacitor C 0, by becoming the positive direct-current pulse voltage after the first diode D1 rectification, this positive direct-current pulse voltage becomes positive smooth dc voltage after 1 filtering of first capacitor C, be used to drive first group of LED S1, this moment, capacitor C 0 two ends formed error voltage, and after the one-period, this error voltage comprises the error that second source V2 causes; When pulse voltage Vin output low level voltage, the error voltage of capacitor C 0 adds this low level voltage, and by becoming negative dc pulse voltage after the second diode D2 rectification, this negative dc pulse voltage becomes negative smooth dc voltage after 2 filtering of second capacitor C; The high level voltage of pulse voltage Vin output becomes dc pulse voltage after through the 9th diode D9 rectification, this dc pulse voltage obtains second source V2 after 9 filtering of the 9th capacitor C, this second source V2 is with after above-mentioned negative smooth dc voltage is connected, drive second group of LED S2, because second source V2 participates in driving second group of LED S2, so reduced the output voltage range of pulse voltage Vin, solved insulation and the heating problem of Vin thus.
See also Fig. 6, be the preferred embodiment of the present invention three, comprise second source V2, inductance L, switching device S, capacitor C 0, the first diode D1, the second diode D2, first capacitor C 1, second capacitor C 2, first group of LED S1, second group of LED S2 and second source V2, compare the pulse voltage Vin among Fig. 2, pulse voltage among Fig. 6 is by the switch motion of second source V2 by switch S, by 2 end voltage pulse outputs of inductance L, its principle is identical with traditional Boost circuit.
The connected mode of Fig. 6 is, 2 ends of inductance L respectively with capacitor C 0,1 end of switch S connects, capacitor C 0 other end connects the anode of the first diode D1 and the negative electrode of the second diode D2 simultaneously, the negative electrode of the first diode D1 is connected with first capacitor C 1, the anode of the second diode D2 is connected with second capacitor C 2, second capacitor C 2 and second source V2 series connection, the anode of first group of LED S1 is connected first capacitor C, 1 upper end, the negative electrode of first group of LED S1 is connected first capacitor C, 1 lower end, 2 ends of switch S link to each other with second source V2, the other end of second source V2 connects 1 end of inductance L, the negative electrode of second group of LED S2 is connected second capacitor C, 2 upper ends, and the anode of second group of LED S2 is connected second source V2 lower end.
The operation principle of Fig. 6 is: second source V2 is by the switch motion of switching device S, the variation that makes 2 ends of inductance L produce high low-voltage, voltage pulse output, its principle is identical with traditional Boost circuit, when 2 ends of inductance L are output as high level voltage, this high level voltage is through after the capacitor C 0, by becoming the positive direct-current pulse voltage after the first diode D1 rectification, this positive direct-current pulse voltage becomes positive smooth dc voltage after through 1 filtering of first capacitor C, be used to drive first group of LED S1, this moment, capacitor C 0 two ends formed error voltage, and after the one-period, this error voltage comprises the error that second source V2 causes; When 2 ends of inductance L are output as low level voltage, the error voltage of capacitor C 0 adds this low level voltage, by becoming negative dc pulse voltage after the second diode D2 rectification, this negative dc pulse voltage becomes negative smooth dc voltage after 2 filtering of second capacitor C, after the negative therewith smooth dc voltage series connection of second source V2, drive second group of LED S2, because second source V2 participates in driving second group of LED S2, so reduced the output voltage range of pulse voltage Vin, solved insulation and heating problem that pulse voltage produces thus.
See also Fig. 7, be the preferred embodiment of the present invention four, comprise the 3rd power supply V3, inductance L, switching device S, capacitor C 0, the first diode D1, the second diode D2, first capacitor C 1, second capacitor C 2, first group of LED S1, second group of LED S2 and the 9th diode D9 and the 9th capacitor C 9, compare the second source V2 among Fig. 6, the second source V2 among Fig. 7 is obtained by 9 filtering of the 9th diode D9 rectification the 9th capacitor C.
The connected mode of Fig. 7 is, the 3rd power supply V3 upper end connects 1 end of inductance L, 2 ends of inductance L respectively with capacitor C 0,1 end of switch S connects, 2 ends of switch S connect the lower end of the 3rd power supply V3, capacitor C 0 other end connects the anode of the first diode D1 and the negative electrode of the second diode D2 simultaneously, the negative electrode of the first diode D1 is connected with first capacitor C 1, the anode of the second diode D2 is connected with second capacitor C 2, second capacitor C 2 and 9 series connection of the 9th capacitor C, the anode of first group of LED S1 is connected first capacitor C, 1 upper end, the negative electrode of first group of LED S1 is connected first capacitor C, 1 lower end, the negative electrode of second group of LED S2 is connected second capacitor C, 2 upper ends, and the anode of second group of LED S2 is connected the 9th capacitor C 9 lower ends.
The operation principle of Fig. 7 is: the 3rd power supply V3 is by the switch motion of switch S, the variation that makes 2 ends of inductance L produce high low-voltage, voltage pulse output, its principle is identical with traditional Boost circuit, when 2 ends of inductance L are output as high level voltage, this high level voltage is through after the capacitor C 0, by becoming the positive direct-current pulse voltage after the first diode D1 rectification, this positive direct-current pulse voltage becomes positive smooth dc voltage after 1 filtering of first capacitor C, be used to drive first group of LED S1, this moment, capacitor C 0 two ends formed error voltage, and after the one-period, this error voltage comprises the error that the 9th capacitor C 9 causes; When 2 ends of inductance L were output as low level voltage, the error voltage of capacitor C 0 added this low level voltage, and by becoming negative dc pulse voltage after the second diode D2 rectification, this negative dc pulse voltage becomes negative smooth dc voltage after 2 filtering of second capacitor C; The high level voltage of 2 ends of inductance L output becomes dc pulse voltage after through the 9th diode D9 rectification, this dc pulse voltage obtains second source V2 after 9 filtering of the 9th capacitor C, this second source V2 is with after above-mentioned negative smooth dc voltage is connected, drive second group of LED S2, because this direct voltage participates in driving second group of LED S2, so reduced the output voltage range of pulse voltage Vin, solved insulation and the heating problem of Vin thus.
See also Fig. 8, be the preferred embodiment of the present invention five, comprise pulse voltage Vin, transformer T, capacitor C 0, the first diode D1, the second diode D2, first capacitor C 1,2, the first groups of LED S1 of second capacitor C, second group of LED S2 and second source V2.
The connected mode of Fig. 8 is, pulse voltage Vin is connected with the winding N1 of transformer T, the upper end of winding N2 and capacitor C 0 series connection, capacitor C 0 other end connects the anode of the first diode D1 and the negative electrode of the second diode D2 simultaneously, the negative electrode of the first diode D1 is connected with first capacitor C 1, the anode of the second diode D2 is connected with second capacitor C 2, second capacitor C 2 and second source V2 series connection, the anode of first group of LED S1 is connected first capacitor C, 1 upper end, the negative electrode of first group of LED S1 is connected first capacitor C, 1 lower end, the negative electrode of second group of LED S2 is connected second capacitor C, 2 upper ends, the anode of second group of LED S2 is connected second source V2 lower end, when needs more during multivoltage, the winding quantity that can increase transformer T meets design requirement, this more multivoltage both can also can serve as the first power supply V1, second source V2, the 3rd power supply V3 to other electric.
The operation principle of Fig. 8 is, behind the pulse voltage process transformer T, output to capacitor C 0, the winding N2 upper end of transformer T is timing, and positive voltage is through after the capacitor C 0, by becoming the positive direct-current pulse voltage after the first diode D1 rectification, this positive direct-current pulse voltage becomes positive smooth dc voltage after C1 filtering, be used to drive first group of LED S1, and this process makes capacitor C 0 two ends form error voltage, after the one-period, this error voltage comprises the error that second source V2 causes; When the N2 upper end is negative, the error voltage of capacitor C 0 adds this negative voltage, by becoming negative dc pulse voltage after the second diode D2 rectification, this negative dc pulse voltage becomes negative smooth dc voltage after 2 filtering of second capacitor C, after the negative therewith smooth dc voltage series connection of second source V2, drive second group of LED S2, because second source V2 participates in driving second group of LED S2, so reduced the output voltage range of pulse voltage Vin, can use diode D1, the D2 of low-voltage specification, solve insulation and the heating problem of Vin simultaneously.
See also Fig. 9, Fig. 9 is the preferred embodiment of the present invention six, comprise pulse voltage Vin, capacitor C 0, the first diode D1, the second diode D2, first capacitor C 1, second capacitor C 2, first group of LED S1, second group of LED S2 and second source V2, first resistance R, 1, the second resistance R 2, the 3rd resistance R 3, the four resistance R 4; Compare Fig. 2, first capacitor C 1 is connected with first resistance R 1, and first group of LED S1 connects with second resistance R 2, and second source V2 connects with the 3rd resistance R 3, and the second diode D2 connects with the 4th resistance R 4.
Connected mode among Fig. 9 is: pulse voltage Vin connects with capacitor C 0, capacitor C 0 other end connects the anode of the first diode D1 and the negative electrode of the second diode D2 simultaneously, the negative electrode of the first diode D1 is connected with first capacitor C 1, be connected pulse voltage Vin lower end after first capacitor C 1 and the series connection of first resistance R 1, the second diode D2 is connected with second capacitor C, 2 upper ends with the 4th resistance R 4 series connection backs, second capacitor C, 2 lower ends are connected with pulse voltage Vin lower end, second source V2 connects the 3rd resistance R 3 backs and connects with second capacitor C 2, the anode of first group of LED S1 is connected first capacitor C, 1 upper end, be connected pulse voltage Vin lower end after the negative electrode of first group of LED S1 and the series connection of second resistance R 2, the negative electrode of second group of LED S2 is connected second capacitor C, 2 upper ends, and the anode of second group of LED S2 is connected second source V2 lower end.
The operation principle of Fig. 9 is: when pulse voltage Vin output high level voltage, this high level voltage is through after the capacitor C 0, by becoming the positive direct-current pulse voltage after the first diode D1 rectification, this positive direct-current pulse voltage becomes positive smooth dc voltage after 1 filtering of first capacitor C, be used to drive first group of LED S1, first resistance R 1 of connecting with first capacitor C 1 can limit the electric current of first capacitor C 1, the voltage of first resistance R, 1 two ends formation simultaneously can be used for traditional protective circuit, second resistance R 2 of connecting with first group of LED S1 can limit the electric current of first group of LED S1, the voltage that second resistance R, 2 two ends form can be used for traditional protective circuit, this moment, capacitor C 0 two ends formed error voltage, behind the one-period, this error voltage comprises the error that second source V2 causes; When pulse voltage Vin output low level voltage; the error voltage of capacitor C 0 adds this low level voltage; by becoming negative dc pulse voltage after the second diode D2 rectification; the 4th resistance R 4 of connecting with the second diode D2 can limit the electric current of the second diode D2; this negative dc pulse voltage becomes negative smooth dc voltage after 2 filtering of second capacitor C; after the negative therewith smooth dc voltage series connection of second source V2; drive second group of LED S2; the 3rd resistance R 3 of connecting with second source V2 can limit the electric current of second source V2; the voltage of the 3rd resistance R 3 two ends formation simultaneously can be used for traditional protective circuit; because second source V2 participates in driving second group of LED S2; so reduced the output voltage range of pulse voltage Vin, solved insulation and the heating problem of Vin thus.
In sum, LED driving circuit utilization of the present invention is better than known LED driving circuit, can make the electric current absolute value of each road LED S1, LEDS2 identical, and the insulation that makes circuit simultaneously well, it is little to generate heat, and can use cheap device to reduce cost.
What should be understood that is: the foregoing description is just to explanation of the present invention; rather than limitation of the present invention; the present invention can carry out various modifications by those skilled in the art, and any innovation and creation that do not exceed in the connotation scope of the present invention all do not break away from the protection range of claims.
Claims (4)
1. LED driving circuit, be used for the driven for emitting lights diode, and can reduce the output voltage range of pulse voltage Vin, described LED driving circuit, comprise: pulse voltage Vin, capacitor C 0, first capacitor C 1, second capacitor C 2, the first diode D1, the second diode D2, first group of LED S1 and second group of LED S2, second source V2, the first power supply V1, it is characterized in that: its connected mode one is: pulse voltage Vin connects with capacitor C 0, the other end of capacitor C 0 connects the first diode D1 and the second diode D2 simultaneously, the first diode D1 connects with first capacitor C 1, the second diode D2 connects with second capacitor C 2, second capacitor C 2 is connected with second source V2, the anode of first group of LED S1 is connected first capacitor C, 1 upper end, the negative electrode of first group of LED S1 is connected first capacitor C, 1 lower end, and the negative electrode of second group of LED S2 is connected second capacitor C, 2 upper ends, and the anode of second group of LED S2 is connected second source V2 lower end; Its connected mode two is: pulse voltage Vin connects with capacitor C 0, the other end of capacitor C 0 connects the first diode D1 and the second diode D2 simultaneously, the first diode D1 connects with first capacitor C 1, first capacitor C 1 is connected with the first power supply V1, the second diode D2 connects with second capacitor C 2, the anode of first group of LED S1 is connected first capacitor C, 1 upper end, the negative electrode of first group of LED S1 is connected the first power supply V1 lower end, the negative electrode of second group of LED S2 is connected second capacitor C, 2 upper ends, and the anode of second group of LED S2 is connected second capacitor C, 2 lower ends; Its connected mode three is: pulse voltage Vin connects with capacitor C 0, the other end of capacitor C 0 connects the first diode D1 and the second diode D2 simultaneously, the first diode D1 connects with first capacitor C 1, first capacitor C 1 is connected with the first power supply V1, the second diode D2 connects with second capacitor C 2, second capacitor C 2 is connected with second source V2, the anode of first group of LED S1 is connected first capacitor C, 1 upper end, the negative electrode of first group of LED S1 is connected the first power supply V1 lower end, the negative electrode of second group of LED S2 is connected second capacitor C, 2 upper ends, and the anode of second group of LED S2 is connected second source V2 lower end.
2. LED driving circuit as claimed in claim 1, it is characterized in that, capacitor C 0 in the described drive circuit, be connected between the pulse voltage Vin and the first diode D1, capacitor C 0 is used to store the error voltage that the error current of first group of LED S1 and second group of LED S2 causes, this error voltage comprises the error that second source V2 and the first power supply V1 cause, the electric current absolute value of first group of LED S1 and second group of LED S2 is equated.
3. LED driving circuit as claimed in claim 1, it is characterized in that, the light-emitting diode of respectively organizing in the described drive circuit is made of at least 2 LED series connection, when needs detect the electric current of first group of LED S1 or second group of LED S2, can be at first group of LED S1 or the second group of arbitrary end series current of LED S2 testing circuit.
4. LED driving circuit as claimed in claim 1, it is characterized in that, second source V2 in the described drive circuit connects with second capacitor C 2, the first power supply V1 and 1 series connection of first capacitor C, when needs limit the electric current of second source V2, the first power supply V1, second capacitor C 2, first capacitor C 1, can connect current limiting element at arbitrary end of above-mentioned components and parts, the second source V2 and the first power supply V1 both can be obtained through rectifying and wave-filtering by pulse voltage Vin, also can be from the voltage of other existence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102798544A CN102281688A (en) | 2011-09-20 | 2011-09-20 | Drive circuit for light emitting diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102798544A CN102281688A (en) | 2011-09-20 | 2011-09-20 | Drive circuit for light emitting diode |
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| Publication Number | Publication Date |
|---|---|
| CN102281688A true CN102281688A (en) | 2011-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102798544A Pending CN102281688A (en) | 2011-09-20 | 2011-09-20 | Drive circuit for light emitting diode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102651617A (en) * | 2011-12-16 | 2012-08-29 | 马丽娟 | Multichannel loading drive circuit |
| CN107909969A (en) * | 2016-10-11 | 2018-04-13 | 京东方科技集团股份有限公司 | Drive circuit, backlight and display device |
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| CN101909378A (en) * | 2009-06-05 | 2010-12-08 | 华映视讯（吴江）有限公司 | LED driving device and method |
| CN201750606U (en) * | 2010-09-08 | 2011-02-16 | 马丽娟 | Barrierless LED (light-emitting diode) driving circuit |
| CN102170731A (en) * | 2011-02-28 | 2011-08-31 | 马丽娟 | LED drive circuit |
| CN202206627U (en) * | 2011-09-20 | 2012-04-25 | 马丽娟 | Driving circuit of light emitting diode |
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| US20050122090A1 (en) * | 2002-02-06 | 2005-06-09 | Nitta Corporation | Voltage source and current source with capacitor |
| CN101909378A (en) * | 2009-06-05 | 2010-12-08 | 华映视讯（吴江）有限公司 | LED driving device and method |
| CN201750606U (en) * | 2010-09-08 | 2011-02-16 | 马丽娟 | Barrierless LED (light-emitting diode) driving circuit |
| CN102170731A (en) * | 2011-02-28 | 2011-08-31 | 马丽娟 | LED drive circuit |
| CN202206627U (en) * | 2011-09-20 | 2012-04-25 | 马丽娟 | Driving circuit of light emitting diode |
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| CN102651617A (en) * | 2011-12-16 | 2012-08-29 | 马丽娟 | Multichannel loading drive circuit |
| CN107909969A (en) * | 2016-10-11 | 2018-04-13 | 京东方科技集团股份有限公司 | Drive circuit, backlight and display device |
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Application publication date: 20111214 |