CN203761661U - LED light-emitting apparatus, LED drive circuit, and switching power supply drive chip of LED drive circuit - Google Patents
LED light-emitting apparatus, LED drive circuit, and switching power supply drive chip of LED drive circuit Download PDFInfo
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- CN203761661U CN203761661U CN201420158260.7U CN201420158260U CN203761661U CN 203761661 U CN203761661 U CN 203761661U CN 201420158260 U CN201420158260 U CN 201420158260U CN 203761661 U CN203761661 U CN 203761661U
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Abstract
The utility model belongs to the technical field of constant current drive and provides an LED light-emitting apparatus, an LED drive circuit, and a switching power supply drive chip of the LED drive circuit. The switching power supply drive chip comprises a switching device, a logic control module, a first voltage comparison module and a demagnetization detection module. The input end of the first voltage comparison module is connected with the input end of an output circuit. The output end of the first voltage comparison module is connected with the first input end of the logic control module. The first input end of the demagnetization detection module is connected with the voltage output end of the output circuit. The second input end of the demagnetization detection module is connected with the output end of the logic control module. The output end of the demagnetization detection end is connected with the second input end of the logic control module. The logic control module adjusts switching frequency of the switching device according to control signals from the first voltage comparison module and the demagnetization detection module. Compared with the prior art, the switching power supply drive chip is higher in constant current precision, simpler in circuit structure and lower in manufacture cost.
Description
Technical field
The utility model belongs to constant-current drive technology field, relates in particular to a kind of LED light-emitting device, LED drive circuit and Switching Power Supply thereof and drives chip.
Background technology
High brightness light emitting diode LED (Light Emitting Diode), with plurality of advantages such as its energy-saving and environmental protection, efficient, long-lives, becomes green illumination light source of new generation.Increasingly mature along with high-brightness LED lighting technology, it will be widely used in every field, and become the first-selection of lighting source.Manufacture high efficiency, driving power is the key that ensures LED luminescent quality and overall performance cheaply.But because LED lamp obtains brightness and light output intensity parameter correlation, it is directly proportional to its electric current and forward voltage drop, and varies with temperature and change.Therefore, the driving of LED needs constant-current supply, with the fail safe that ensures that LED uses, reaches desirable luminous intensity simultaneously.Visible, select correct LED to drive most important.The coupling of the LED driving power not had, the advantage of LED illumination cannot be embodied.
For above-mentioned for the LED requirement that needed constant current drives of throwing light on, in prior art, LED driving power adopts flyback structure more, one is to adopt former limit feedback arrangement, thereby this kind of structure need to reach by assisting the information of winding feedback secondary to carry out regulation output electric current the object of constant current, but this kind of structure just indirectly detects the information of secondary and used more complicated transformer, thereby have that precision is low, complex structure and a high shortcoming of cost.Another kind is to adopt secondary feedback arrangement, this kind of structure need to increase secondary constant flow module and need the devices such as optocoupler to receive secondary feedack, although can accomplish very high constant current accuracy, but owing to there being the reason of the devices such as secondary constant flow module and optocoupler, make the structure of secondary feedback arrangement more complicated, cost is higher.
In sum, there is the problem that constant current accuracy is low, circuit structure is complicated and cost is high in prior art.
Utility model content
The purpose of this utility model is to provide a kind of LED light-emitting device, LED drive circuit and Switching Power Supply thereof to drive chip, is intended to solve the problem that in prior art, existing constant current accuracy is low, circuit structure is complicated and cost is high.
A kind of Switching Power Supply of the utility model embodiment drives chip, be connected with input stage current rectifying and wave filtering circuit and output-stage circuit in LED drive circuit, described input rectifying filter circuit carries out rectifying and wave-filtering to alternating current, described output-stage circuit driving LED loaded work piece;
Described Switching Power Supply drives chip to comprise: switching device, Logic control module, the first voltage comparison module and demagnetization detection module;
The input of described switching device connects the output of described input stage current rectifying and wave filtering circuit, the output of described switching device connects the input of described output-stage circuit, and described switching device is supplied with LED load by the direct current of input stage current rectifying and wave filtering circuit output by the output of output-stage circuit in the time of conducting;
The input of described the first voltage comparison module connects the input of described output-stage circuit, the output of described the first voltage comparison module connects the first input end of described Logic control module, described the first voltage comparison module compares the input voltage of described output-stage circuit and the first reference voltage, and output disconnects control signal in the time that described input voltage exceedes described the first reference voltage, switching device described in described Logic control module control is disconnected;
The first input end of described demagnetization detection module connects the voltage output end of described output circuit, the second input of described demagnetization detection module connects the output of described Logic control module, the output of described demagnetization detection module connects the second input of described Logic control module, described demagnetization detection module is in the time that switching device described in described Logic control module control disconnects, output disconnects control signal makes switching device described in described Logic control module control remain open state, and the conducting control signal of exporting in the time that the output voltage of described output-stage circuit is less than the second reference voltage, make switching device conducting described in described Logic control module control,
Described Logic control module regulates the switching frequency of described switching device according to the control signal of described the first voltage comparison module and the output of described demagnetization detection module.
Described demagnetization detection module comprises:
Second voltage comparison module, signal lag holding circuit and the first NAND gate;
The input of described second voltage comparison module is the second input of described demagnetization detection module, the input of described signal lag holding circuit is the first input end of described demagnetization detection module, the output of described second voltage comparison module is connected the input of described the first NAND gate with the output of described signal lag holding circuit, the output of described the first NAND gate is the output of described demagnetization detection module.
Described signal lag holding circuit comprises delay circuit and NOR gate, the common input that forms described signal lag holding circuit of the input of described delay circuit and the input of described NOR gate, the output of described NOR gate is the output of described time delay holding circuit.
Described Logic control module comprises: the second NAND gate, the 3rd NAND gate and not gate;
The first input end of described the second NAND gate is the second input of described Logic control module, the second input of described the second NAND gate connects the output of described the 3rd NAND gate, the first input end of Logic control module described in the first input end of described the 3rd NAND gate, the second input of described the 3rd NAND gate connects the output of described the second NAND gate, the output of described the 3rd NAND gate connects the input of described not gate, the output that the output of described not gate is described Logic control module.
Described switching device is field effect transistor, and grid, drain electrode and the source electrode of described field effect transistor is respectively control end, input and the output of described switching device.
The utility model embodiment also provides a kind of LED drive circuit, comprises input stage current rectifying and wave filtering circuit and output-stage circuit, it is characterized in that, described switch power source driving circuit also comprises that above-mentioned Switching Power Supply drives chip.
Described input stage current rectifying and wave filtering circuit comprises rectifier bridge and the second electric capacity, the first input end of described rectifier bridge and the second input incoming transport electricity, the common contact of the first end of the output of described rectifier bridge and described the second electric capacity is the output of described input stage current rectifying and wave filtering circuit, the equal ground connection of the second end of the earth terminal of described rectifier bridge and described the second electric capacity.
Described output-stage circuit comprises: sampling resistor, inductance, diode, the first electric capacity and pressure sampling circuit;
The first end of described sampling resistor is the input of described output-stage circuit, the second end of described sampling resistor connects the first end of described inductance, the negative electrode of described diode and the input of described pressure sampling circuit, the voltage output end that the first output of described pressure sampling circuit is described output-stage circuit, the second output of described pressure sampling circuit connects the second end of described inductance and the first end of described the first electric capacity, the output that the second output of described pressure sampling circuit is described output-stage circuit, the second end of the anode of described diode and described the first electric capacity is connected to ground altogether.
Described pressure sampling circuit comprises the second resistance and the 3rd resistance, the first end of described the second resistance is the input of described pressure sampling circuit, the second end of described the second resistance connects the first end of described the 3rd resistance, the second output that the second end of described the 3rd resistance is described pressure sampling circuit, the first output that the second end of described the second resistance is described pressure sampling circuit.
The utility model embodiment also provides a kind of LED light-emitting device, comprises LED load, and described LED light-emitting device also comprises above-mentioned LED drive circuit.
A kind of LED light-emitting device of the utility model embodiment, LED drive circuit and Switching Power Supply thereof drive chip compared with prior art, by adopting step-down conversion circuit to detect the electric current of the voltage of sampling resistor and the inductance of flowing through, and according to testing result, switching device is carried out to logic control, realize the logic control to load constant current, avoid the former limit of available technology adopting feedback or secondary feedback arrangement and caused the defect of circuit structure complexity, compared with prior art, constant current accuracy is high, circuit structure is simple and low cost of manufacture for the utility model.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation that a kind of Switching Power Supply that the utility model embodiment provides drives chip;
Fig. 2 is the particular circuit configurations figure that a kind of Switching Power Supply that the utility model embodiment provides drives chip;
Fig. 3 is the particular circuit configurations figure of a kind of LED drive circuit of providing of the utility model embodiment.
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.
For technical scheme described in the utility model is described, describe below by specific embodiment.
A kind of Switching Power Supply of the utility model embodiment drives chip 20, refer to Fig. 1, be connected with input stage current rectifying and wave filtering circuit 10 and output-stage circuit 30 in LED drive circuit, described input rectifying filter circuit 10 carries out rectifying and wave-filtering to alternating current, described output-stage circuit 30 driving LED loaded work pieces;
Described Switching Power Supply drives chip to comprise: switching device 14, Logic control module 13, the first voltage comparison module 11 and demagnetization detection module 12;
The input of described switching device 14 connects the output of described input stage current rectifying and wave filtering circuit 10, the output of described switching device 14 connects the input of described output-stage circuit 30, and the direct current that described switching device 14 is exported input stage current rectifying and wave filtering circuit 10 in the time of conducting is supplied with LED load by the output of output-stage circuit 30;
The input of described the first voltage comparison module 11 connects the input of described output-stage circuit 30, the output of described the first voltage comparison module 11 connects the first input end of described Logic control module 13, described the first voltage comparison module 11 compares the input voltage of described output-stage circuit 30 and the first reference voltage, and in the time that described input voltage exceedes described the first reference voltage, output disconnects control signal, makes described Logic control module 13 control described switching device 14 and disconnects;
The first input end of described demagnetization detection module 12 connects the voltage output end of described output circuit, the second input of described demagnetization detection module 12 connects the output of described Logic control module 13, the output of described demagnetization detection module 12 connects the second input of described Logic control module 13, described demagnetization detection module 12 is in the time that described Logic control module 13 is controlled described switching device 14 and disconnected, output disconnection control signal makes described Logic control module 13 control described switching device 14 and remains open state, and the conducting control signal of exporting in the time that the output voltage of described output-stage circuit 30 is less than the second reference voltage, make described Logic control module 13 control described switching device 14 conductings,
The control signal that described Logic control module 13 is exported according to described the first voltage comparison module 11 and described demagnetization detection module 12 regulates the switching frequency of described switching device 14.
Wherein, the control signal that demagnetization detection module 12 is exported for receive logic control module 13 is also carried out time delay in inside, receive the output voltage of output-stage circuit 30 simultaneously, and the output voltage of output-stage circuit 30 and the second reference voltage are compared, and comparative result is sent to Logic control module 13.
Concrete, refer to Fig. 2, demagnetization detection module 12 comprises second voltage comparison module 17, signal lag holding circuit 16 and the first NAND gate U4, the input of second voltage comparison module 17 is the second input of demagnetization detection module 12, the input of signal lag holding circuit 16 is the first input end of demagnetization detection module 12, the output of second voltage comparison module 17 is connected the input of the first NAND gate U4 with the output of signal lag holding circuit 16, the output of the first NAND gate U4 is the output of demagnetization detection module 12.
Concrete, signal lag holding circuit 16 comprises delay circuit U1 and NOR gate U2, the input of the input of delay circuit U1 and NOR gate U2 forms the input of signal lag holding circuit 16 jointly, and the output of NOR gate U2 is the output of time delay holding circuit 16.
The switching frequency of the control signal control switch device that wherein, Logic control module 13 is exported according to the first voltage comparison module 11 and demagnetization detection module 12.
Concrete, Logic control module 13 comprises the second NAND gate U5, the 3rd NAND gate U6 and not gate U7, the first input end of the second NAND gate U5 is the second input of Logic control module 13, the second input of the second NAND gate U5 connects the output of the 3rd NAND gate U6, the first input end of the first input end Logic control module 13 of the 3rd NAND gate U6, the second input of the 3rd NAND gate U6 connects the output of the second NAND gate U5, the output of the 3rd NAND gate U6 connects the input of not gate U7, and the output of not gate U7 is the output of Logic control module 13.
Concrete, described the first voltage comparison module 11 comprises the first voltage comparator U8 and the first voltage-reference, described the first voltage-reference connects the in-phase input end of described the first voltage comparator U8, the inverting input of described the first voltage comparator U8 is the input of described the first voltage comparison module 11, and the output of described the first voltage comparator U8 is the output of described the first voltage comparison module 11.
Concrete, described second voltage comparison module 17 comprises second voltage comparator U3 and second voltage a reference source, described second voltage a reference source connects the in-phase input end of described second voltage comparator U3, the inverting input of described second voltage comparator U3 is the input of described second voltage comparison module 17, and the output of described second voltage comparator U3 is the output of described second voltage comparison module 17.
Concrete, switching device 14 is field effect transistor, and the grid of field effect transistor is the control end of switching device 14, and the drain electrode of field effect transistor is the input of switching device 14, and the source electrode of field effect transistor is the output of switching device 14.
The utility model another kind of embodiment provide a kind of LED drive circuit, refers to Fig. 3, comprises input stage current rectifying and wave filtering circuit 10 and output-stage circuit 30, and described switch power source driving circuit also comprises that above-mentioned Switching Power Supply drives chip.
Described input stage current rectifying and wave filtering circuit 10 comprises rectifier bridge 2 and the second capacitor C 2, the first input end of described rectifier bridge 2 and the second input incoming transport electricity, the common contact of the first end of the output of described rectifier bridge 2 and described the second capacitor C 2 is the output of described input stage current rectifying and wave filtering circuit 10, the equal ground connection of the second end of the earth terminal of described rectifier bridge 2 and described the second capacitor C 2.
Described output-stage circuit 30 comprises: sampling resistor R1, inductance L 1, diode D1, the first capacitor C 1 and pressure sampling circuit 15;
The first end of described sampling resistor R1 is the input of described output-stage circuit 30, the second end of described sampling resistor R1 connects the first end of described inductance, the input of the negative electrode of described diode D1 and described pressure sampling circuit 15, the first output of described pressure sampling circuit 15 is the voltage output end of described output-stage circuit 30, the second output of described pressure sampling circuit 15 connects the second end of described inductance L 1 and the first end of described the first capacitor C 1, the second end of the anode of described diode D1 and described the first capacitor C 1 is connected to ground altogether, the second end of described inductance L 1 is the output of described output-stage circuit 30.
Concrete, pressure sampling circuit 15 comprises the second resistance R 2 and the 3rd resistance R 3, the first end of the second resistance R 2 is the input of pressure sampling circuit 15, the second end of the second resistance R 2 connects the first end of the 3rd resistance R 3, the second end of the 3rd resistance R 3 is the second output of pressure sampling circuit 15, and the second end of the second resistance R 2 is the first output of pressure sampling circuit 15.
Below in conjunction with operation principle, above-mentioned LED constant-current drive circuit is described further, details are as follows:
The direct current Vin that rectifier circuit 2 is exported after the second capacitor C 2 filtering enters the Buck conversion circuit being made up of the first capacitor C 1, the second capacitor C 2, sampling resistor R1, the second resistance R 2, the 3rd resistance R 3, diode D1, inductance L 1, the first voltage comparator U8, demagnetization detection module 12, Logic control module 13 and switching circuit 14, the size of output current Iout (also claiming output average current) is to be determined by the electric current I L of inductance L 1, in order to reach the object of controlling output current Iout, need the electric current I L to flowing through inductance L 1 to control.
According to the operation principle of Buck conversion circuit and critical conduction mode, in the on-off period of NMOS pipe Q1, the mean value Ioutavg of output current is shown below with the peak current ILP relation that flows through inductance L 1:
Because of the peak current ILP that flows through inductance L 1 be again,
Wherein Vcspk represents sampling resistor R1 crest voltage.
Therefore constant in order to ensure the mean value Ioutavg of output current Iout, only need to ensure that the crest voltage at sampling resistor R1 two ends is constant.
The course of work of a kind of LED drive circuit of the utility model embodiment is: refer to Fig. 2, Fig. 3, in the time that inverter U7 is output as high level, field effect transistor Q1 conducting, the electric current that flows through sampling resistor R1 increases the also increase gradually of electric current of flowing through inductance L 1 gradually, sampling resistor R1 both end voltage also increases gradually, in the time that the voltage on sampling resistor R1 reaches the first reference voltage, low level is controlled in the first voltage comparator U8 output, NAND gate U6 output high level in Logic control module 13, cause not gate U7 output low level, thereby turn-off field effect transistor Q1, now sampling resistor R1 both end voltage becomes 0V, high level is controlled in the first voltage comparator U8 output.Due to the NAND gate U6 output high level in Logic control module 13, make delay circuit U1 and NOR gate U2 in demagnetization detection module 12 produce a confinement signal, make the output of NAND gate U4 within the trailing edge certain time-delay time of not gate U7 output signal, remain high output, by the ratio that divider resistance R2 and R3 are suitable is set, in the time that field effect transistor Q1 closes, make FB port voltage higher than the second reference voltage, make the second voltage comparator U3 output low level in demagnetization detection module 12, further make NAND gate U4 output high level, the state before the RS latch output maintenance of the NAND gate U5 in Logic control module 13 and NAND gate U6 composition is NAND gate U6 output high level, not gate U7 output keeps low level, the electric current now flowing through in inductance L 1 reduces gradually, after being reduced to zero, FB port voltage can be reduced to below the second reference voltage, make the second voltage comparator U3 output high level in demagnetization detection module 12, because now NOR gate U2 output is also high level, NAND gate U4 output low level, make the RS latch change state of NAND gate U5 in Logic control module 13 and NAND gate U6 composition make NAND gate U6 output low level, not gate U7 exports high level, thereby make field effect transistor Q1 conducting, so iterative cycles is realized control principle, thereby also reach the object that realizes constant current.
The utility model another kind of embodiment also provide a kind of LED light-emitting device, comprises LED load, and described LED light-emitting device also comprises above-mentioned LED drive circuit.
A kind of Switching Power Supply of the utility model embodiment drives chip, switch power source driving circuit and LED light-emitting device compared with prior art, by adopting step-down conversion circuit to detect the electric current of the voltage of sampling resistor and the inductance of flowing through, and according to testing result, switching device is carried out to logic control, realize the logic control to load constant current, the defect of the circuit structure complexity of having avoided available technology adopting former limit feedback or secondary feedback and cause, compared with prior art, constant current accuracy is high, circuit structure is simple and low cost of manufacture for the utility model.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field; make without departing from the concept of the premise utility some alternative or obvious modification that are equal to; and performance or purposes identical, all should be considered as belonging to the utility model by the definite scope of patent protection of submitted to claims.
Claims (10)
1. Switching Power Supply drives a chip, is connected with input stage current rectifying and wave filtering circuit and output-stage circuit in LED drive circuit, and described input rectifying filter circuit carries out rectifying and wave-filtering to alternating current, described output-stage circuit driving LED loaded work piece;
It is characterized in that, described Switching Power Supply drives chip to comprise: switching device, Logic control module, the first voltage comparison module and demagnetization detection module;
The input of described switching device connects the output of described input stage current rectifying and wave filtering circuit, the output of described switching device connects the input of described output-stage circuit, and described switching device is supplied with LED load by the direct current of input stage current rectifying and wave filtering circuit output by the output of output-stage circuit in the time of conducting;
The input of described the first voltage comparison module connects the input of described output-stage circuit, the output of described the first voltage comparison module connects the first input end of described Logic control module, described the first voltage comparison module compares the input voltage of described output-stage circuit and the first reference voltage, and output disconnects control signal in the time that described input voltage exceedes described the first reference voltage, switching device described in described Logic control module control is disconnected;
The first input end of described demagnetization detection module connects the voltage output end of described output-stage circuit, the second input of described demagnetization detection module connects the output of described Logic control module, the output of described demagnetization detection module connects the second input of described Logic control module, described demagnetization detection module is in the time that switching device described in described Logic control module control disconnects, output disconnects control signal makes switching device described in described Logic control module control remain open state, and the conducting control signal of exporting in the time that the output voltage of described output-stage circuit is less than the second reference voltage, make switching device conducting described in described Logic control module control,
Described Logic control module regulates the switching frequency of described switching device according to the control signal of described the first voltage comparison module and the output of described demagnetization detection module.
2. Switching Power Supply as claimed in claim 1 drives chip, it is characterized in that, described demagnetization detection module comprises:
Second voltage comparison module, signal lag holding circuit and the first NAND gate;
The input of described second voltage comparison module is the second input of described demagnetization detection module, the input of described signal lag holding circuit is the first input end of described demagnetization detection module, the output of described second voltage comparison module is connected the input of described the first NAND gate with the output of described signal lag holding circuit, the output of described the first NAND gate is the output of described demagnetization detection module.
3. Switching Power Supply as claimed in claim 2 drives chip, it is characterized in that, described signal lag holding circuit comprises delay circuit and NOR gate, the common input that forms described signal lag holding circuit of the input of described delay circuit and the input of described NOR gate, the output of described NOR gate is the output of described time delay holding circuit.
4. Switching Power Supply as claimed in claim 1 drives chip, it is characterized in that, described Logic control module comprises: the second NAND gate, the 3rd NAND gate and not gate;
The first input end of described the second NAND gate is the second input of described Logic control module, the second input of described the second NAND gate connects the output of described the 3rd NAND gate, the first input end of Logic control module described in the first input end of described the 3rd NAND gate, the second input of described the 3rd NAND gate connects the output of described the second NAND gate, the output of described the 3rd NAND gate connects the input of described not gate, the output that the output of described not gate is described Logic control module.
5. Switching Power Supply as claimed in claim 1 drives chip, it is characterized in that, described switching device is field effect transistor, and grid, drain electrode and the source electrode of described field effect transistor is respectively control end, input and the output of described switching device.
6. a LED drive circuit, comprises input stage current rectifying and wave filtering circuit and output-stage circuit, it is characterized in that, described switch power source driving circuit also comprises that the Switching Power Supply as described in claim 1 to 5 any one drives chip.
7. LED drive circuit as claimed in claim 6, it is characterized in that, described input stage current rectifying and wave filtering circuit comprises rectifier bridge and the second electric capacity, the first input end of described rectifier bridge and the second input incoming transport electricity, the common contact of the first end of the output of described rectifier bridge and described the second electric capacity is the output of described input stage current rectifying and wave filtering circuit, the equal ground connection of the second end of the earth terminal of described rectifier bridge and described the second electric capacity.
8. LED drive circuit as claimed in claim 6, is characterized in that, described output-stage circuit comprises:
Sampling resistor, inductance, diode, the first electric capacity and pressure sampling circuit;
The first end of described sampling resistor is the input of described output-stage circuit, the second end of described sampling resistor connects the first end of described inductance, the negative electrode of described diode and the input of described pressure sampling circuit, the voltage output end that the first output of described pressure sampling circuit is described output-stage circuit, the second output of described pressure sampling circuit connects the second end of described inductance and the first end of described the first electric capacity, the output that the second output of described pressure sampling circuit is described output-stage circuit, the second end of the anode of described diode and described the first electric capacity is connected to ground altogether.
9. LED drive circuit as claimed in claim 8, it is characterized in that, described pressure sampling circuit comprises the second resistance and the 3rd resistance, the first end of described the second resistance is the input of described pressure sampling circuit, the second end of described the second resistance connects the first end of described the 3rd resistance, the second output that the second end of described the 3rd resistance is described pressure sampling circuit, the first output that the second end of described the second resistance is described pressure sampling circuit.
10. a LED light-emitting device, comprises LED load, it is characterized in that, described LED light-emitting device also comprises the LED drive circuit as described in claim 6 to 9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420158260.7U CN203761661U (en) | 2014-04-02 | 2014-04-02 | LED light-emitting apparatus, LED drive circuit, and switching power supply drive chip of LED drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420158260.7U CN203761661U (en) | 2014-04-02 | 2014-04-02 | LED light-emitting apparatus, LED drive circuit, and switching power supply drive chip of LED drive circuit |
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| CN203761661U true CN203761661U (en) | 2014-08-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103929855A (en) * | 2014-04-02 | 2014-07-16 | 深圳市明微电子股份有限公司 | LED lighting device, LED driving circuit and switch power source driving chip of LED driving circuit |
| CN106300924A (en) * | 2016-08-25 | 2017-01-04 | 滁州学院 | A kind of backlight power circuit, drive circuit and display device |
| CN107507561A (en) * | 2017-09-27 | 2017-12-22 | 宗仁科技(平潭)有限公司 | A kind of LED control chips and LED information display system |
-
2014
- 2014-04-02 CN CN201420158260.7U patent/CN203761661U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103929855A (en) * | 2014-04-02 | 2014-07-16 | 深圳市明微电子股份有限公司 | LED lighting device, LED driving circuit and switch power source driving chip of LED driving circuit |
| CN103929855B (en) * | 2014-04-02 | 2017-01-25 | 深圳市明微电子股份有限公司 | LED lighting device, LED driving circuit and switch power source driving chip of LED driving circuit |
| CN106300924A (en) * | 2016-08-25 | 2017-01-04 | 滁州学院 | A kind of backlight power circuit, drive circuit and display device |
| CN107507561A (en) * | 2017-09-27 | 2017-12-22 | 宗仁科技(平潭)有限公司 | A kind of LED control chips and LED information display system |
| CN107507561B (en) * | 2017-09-27 | 2022-12-13 | 宗仁科技(平潭)有限公司 | LED control chip and LED system |
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