CN201450636U - LED constant-current drive circuit capable of regulating light - Google Patents
LED constant-current drive circuit capable of regulating light Download PDFInfo
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- CN201450636U CN201450636U CN2009200578444U CN200920057844U CN201450636U CN 201450636 U CN201450636 U CN 201450636U CN 2009200578444 U CN2009200578444 U CN 2009200578444U CN 200920057844 U CN200920057844 U CN 200920057844U CN 201450636 U CN201450636 U CN 201450636U
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Abstract
The utility model relates to an LED constant-current drive circuit capable of regulating light, which belongs to the technical field of current drive circuits, and particularly relates to the improvement of the LED constant-current drive circuit capable of regulating light. The LED constant-current drive circuit capable of regulating light comprises a lightning protection and electromagnetic compatible circuit (1), a power factor correcting circuit (2), a plurality of constant-current power supply circuits (3, 4), a light regulating control power supply circuit (6) and a light regulating control circuit (5) provided with a series interface, and further comprises a warning detection circuit (7), wherein the warning detection circuit (7) extracts warning signals from the constant-current power supply circuits (3, 4), and the signals are output to the light regulating control circuit (5) after being identified and processed. The LED constant-current drive circuit can resist external electromagnetic interference, can supply dynamic complementation, and can further have more outstanding electric energy utilization ratio even when load is dynamically changed, thereby improving the energy-saving effect, and the LED constant-current drive circuit can conduct the programmable control or the network monitoring of a lighting device, and achieves a plurality of needed lighting effects.
Description
Affiliated technical field
The utility model relates to a kind of tunable optical constant-current drive circuit, belongs to the current driving circuit technical field, relates in particular to the improvement of Dimmable LED constant-current drive circuit.Be used for power supply and drive and regulate the load that light-emitting diode (LED) is constituted.Comprise electromagnetic compatibility circuit, power factor correction circuit, some constant-current power supply circuits, brightness adjustment control power supply circuits, adjusting control circuit.
Background technology
Since the sixties in 20th century were born first light-emitting diode, in the quite a long time, because the limitation of output lumen, LED just was applied in signal indication purposes.To 20th century the nineties, blue-ray LED is owing to the implementation method of less expensive is able to commercialization.Enter 21st century, large power white light LED is developed success and industrialization promptly.Around here, because the intervention of large-scale lighting source electric corporation, for example PHILIPS and OSRAM, the light efficiency of high-brightness white-light LED has been obtained breakthrough improvement, and promptly begins to enter the application of general lighting.At present, the light efficiency of high-brightness white-light LED has surmounted the light efficiency of fluorescent lamp under good radiating condition.Along with more technology and capital input, the light efficiency of high-brightness LED is in continuous raising, and its cost then begins to descend fast, and finally its ratio of performance to price will be accepted by ordinary consumer.The application of LED in lighting field extremely extensively with various, is considered to the revolution for the third time in the artificial light sources, and its influence that brings will be very far-reaching.
According to USDOE (DOE) statistics, the electric energy of the U.S. 22% is used for illumination.DOE claims that in 20 years from now on the LED illumination will obtain popularizing fast in the U.S., can reduce by 62% illumination power requirement.In addition, it can eliminate 2.58 hundred million tons silicon dioxide discharge capacity, builds 133 new power plant less.Adopt the LED illumination can make finance reduce more than 1,150 hundred million dollars.
LED is because numerous advantages such as environmental protection, life-span length, photoelectric efficiency height, use in every profession and trade in recent years and be able to fast development, the driving power of LED has become the focus of attention, in theory, the useful life of LED is more than 100,000 hours, but in actual application,, LED is very easily damaged because the design of driving power and type of drive selection are improper.
The method that LED brightness is adjusted has the wide modulation of DC driven and pulse to drive 2 kinds of type of drive usually.DC driven is exactly the driving that directly changes current value, and the wide modulation of pulse drives (PWM) and do not change current value and with the driving of ratio (duty ratio) change streaming current time of the make-and-break time of pulse.
For realizing purpose with an automatic light meter, people often realize control automatically by timer or light sensor etc., as patentee Zhou Anping, the name of application on April 9th, 2008 is called " Dimmable LED illuminating lamp " (patent No.: 200820085623.3, open (bulletin) day: on January 7th, 2009, publication number: patent CN201177243), the Dimmable LED illuminating lamp that this utility model provides, with light-emitting diode [LED], power circuit and LED driving circuit constitute, have in drive circuit with timer integrated circuit [NE] is the light modulation pwm control circuit [I] of core, the light modulation pwm control circuit has PWM output [3], other has the luminous constant-current source chip circuit [II] that has voltage input end of driving LED, and this voltage input end is connected through a resistance [R3] with PWM output in the light modulation pwm control circuit.Import the bright dark of PWM scalable LED at the voltage input end of constant-current source chip circuit.
Similar above-mentioned prior art also has a lot, mainly be connecting and disconnecting of the circuit, the light modulation that realizes having actual conditions, can't satisfy the intelligent control of illumination that realizes real meaning according to conditions such as environmental change, consumer premise demand, centralized consent controls, regulate and control single, difficult, as will changing controlled condition or parameter, will change relevant hardware, and do not provide calibration of power power factor (PF) and electromagnetic compatibility circuit, therefore, the high order harmonic component that produces can cause harmonic pollution and interference to electrical network and other electrical equipment, and it is also relatively poor self to resist outside electromagnetic interference capability.
The utility model content
The autogenous control sealing that the utility model exists at Dimmable LED drive circuit in the prior art and electrical network existed is polluted and problems such as self anti-electromagnetic interference performance difference, and a kind of cluster regulation and control, few harmonic pollution, Dimmable LED constant-current drive circuit that anti-electromagnetic interference capability is strong be convenient to is provided.
For solving the problems of the technologies described above, the utility model is solved by following technical solution: a kind of Dimmable LED constant-current drive circuit, comprise electromagnetic compatibility circuit 1, power factor correction circuit 2, some constant-current power supply circuits 3,4, brightness adjustment control power supply circuits 6, adjusting control circuit 5, wherein: lightning protection and electromagnetic compatibility circuit 1, input is connected with city's alternating current; Power factor correction circuit 2, input is connected with electromagnetic compatibility circuit 1 output; Some constant-current power supply circuits 3,4, input is connected with power factor correction circuit 2 outputs; Brightness adjustment control power supply circuits 6, input is connected with power factor correction circuit 2 outputs; The adjusting control circuit 5 of band serial line interface, input is connected with brightness adjustment control power supply circuits 6 outputs, and output is connected with some constant-current power supply circuits 3,4.
Also comprise alarm detection circuit 7, described alarm detection circuit 7 extracts alarm signal from constant-current power supply circuit 3,4, exports to adjusting control circuit 5 after identification is handled.
Described alarm signal is the voltage signal of constant-current power supply circuit 3,4 outputs.
Described lightning protection and electromagnetic compatibility circuit 1 are 2 level electromagnetic compatibles, and electric main is through inductance L 5, after L6, capacitor C 63 filtering, the protection of lightning protection piezo-resistance R110 surge, by common mode inhibition transformer T2, T6 and safety capacitor C 63, C18, C33, C42, C7, C4, C10 forms 2 level electromagnetic compatibles, and at 2 grades of transformer T2, the T6 output is provided with the L3 choke, leach interference, export to PFC correcting circuit 2 through full-wave rectification BD1 again.
Described power factor correction circuit 2 comprises step-up transformer T3, connect that transformer T3 is former, the Active PFC chip U4 of secondary both sides and peripheral Resistor-Capacitor Unit thereof, MOS switching tube Q2, voltage stabilizing didoe Z2, close by control MOS switching tube Q2 and to close, stop high order harmonic component output.
Described constant-current power supply circuit 3,4 adopts the single-ended reverse exciting mode, will be through the power supply of power factor correction circuit 2 outputs, export to LED after importing the transformer T4 of this circuit, at the constant-current control circuit of former, secondary both sides interconnective built-in metal-oxide-semiconductor galvanostat U7 of difference of transformer T4 and peripheral Resistor-Capacitor Unit composition thereof and the comparison circuit that reference voltage chip U2, comparator U6, three machine pipe Q4 and peripheral Resistor-Capacitor Unit are formed, T4 adjustable stabling current of level output of control transformer.
Described brightness adjustment control power supply circuits 6, will be through the power supply of power factor correction circuit 2 outputs, import step-down behind the transformer T7 of this circuit and export the power supply of 2 groups of different voltages, use for adjusting control circuit 5, wherein 1 group of power supply is in former, the secondary both sides of transformer T7 difference interconnective built-in metal-oxide-semiconductor galvanostat U13, reference voltage chip U15, peripheral Resistor-Capacitor Unit, optocoupler U14, the stabilized voltage power supply of T7 level output of control transformer.
The adjusting control circuit 5 of described band serial line interface comprises: central processing unit CPU device U8 and peripheral Resistor-Capacitor Unit, crystal X1 form plug-in control centre; By 232 serial interface chip IC 1 that are connected with control centre and the peripheral serial interface circuit of forming, RS485 serial interface chip U3 that is connected with control centre and peripheral cell RS485 serial interface circuit, realize the automatic distribution function in address of each light fixture, receive control signal or network monitoring signal; The interface circuit that RS485 interface chip U12 that is connected with control centre and peripheral cell, transformer T9 form, the user is provided with the address of light fixture by this interface, and this serial ports is converted to the RS232 level by IC1, outputs to external interface, carry out the setting of address, the light modulation instruction transformation for needing other pwm signal of level, is exported to constant- current source 3,4, reach dimming effect, optocoupler IC4 wherein is set, and IC5 carries out Signal Spacing, in order to avoid circuit is punctured by outside surging signal.
Described alarm-monitor circuit 7 comprises the led circuit sample circuit, takes a sample again through triode Q1 from constant-current source, and the Q3 amplification exports not gate U1 to, exports to adjusting control circuit 5.
The utility model Dimmable LED constant-current drive circuit has following beneficial effect:
1. owing to adopt open environment promptly with the adjusting control circuit of serial line interface, can communicate by letter with illumination control centre by the remote control signal transmission unit, thereby finish relevant controlling (as ON/OFF, brightness adjustment control) to every lamp, and can carry out relevant monitoring to the operating state of every lamp by illumination control centre, need not to be in the action and just can control various ruuning situations, can realize Based Intelligent Control such as timing monitoring, detection and the light modulation of execution switch, operation costs are reduced greatly;
2. owing to adopt power factor correction circuit (pfc circuit), increase pfc circuit to power supply, purpose is exactly in order to reduce harmonic pollution and the interference to electrical network and other electric equipments of the high order harmonic component that produces in the power supply, thereby improved utilance to electric energy, dynamic compensation can be provided, even when loading on dynamic change, also can have more outstanding utilization rate of electrical, thereby promote power savings.
3. owing to adopt electromagnetic compatibility (EMC) circuit, can resist outside electromagnetic interference, reduce the infringement of thunderbolt circuit.
Description of drawings
To adopting a kind of LED constant-current drive circuit of the present utility model, embodiment is elaborated below in conjunction with accompanying drawing.Described embodiment is that the mode with the indefiniteness example provides:
Fig. 1 is the utility model schematic block circuit diagram;
Fig. 2 is an EMC protection circuit schematic diagram in the utility model;
Fig. 3 is a PFC correcting circuit schematic diagram in the utility model;
Fig. 4 is a constant-current source circuit schematic diagram in the utility model;
Fig. 5 is a brightness adjustment control power supply circuits schematic diagram in the utility model;
Fig. 6 is alarm-monitor circuit theory diagrams in the utility model;
Fig. 7 is an adjusting control circuit schematic diagram in the utility model;
Fig. 8 is an another kind of adjusting control circuit schematic diagram in the utility model.
Embodiment
As Fig. 1 is the constant-current source circuit of tunable optical, comprises EMC protection circuit 1, PFC correcting circuit 2; Constant- current source circuit 3,4, adjusting control circuit 5; Brightness adjustment control power supply circuits 6 are formed; The input of described EMC protection circuit 1 is received external AC 220V input, output is connected to PFC correcting circuit 2, the 400V constant voltage signal of described PFC correcting circuit 2 outputs is exported to constant- current source circuit 3,4 and light modulation power supply circuits 6, described constant- current source 3,4 outputs drive outside light fixture, the output output pwm signal of described adjusting control circuit 5 drives constant- current source 3,4, to reach the light modulation purpose.The constant voltage signal of described brightness adjustment control power supply circuits 6 outputs provides brightness adjustment control 5.Described alarm-monitor circuit 7 extracts alarm signal from constant- current source 3,4, and the outputting alarm signal is given adjusting control circuit 5.
Wherein EMC and harmonic wave index are realized by lightning protection and EMC circuit module; PF＞0.9 index is realized by the PFC power factor correction circuit; The constant current function is realized by the constant-current circuit module; Dimming function is firm and hard existing by brightness adjustment control.The apparent power index is realized jointly by PFC power factor correction circuit and constant-current circuit.
Described EMC protection circuit 1 as shown in Figure 2, by common mode inhibition transformer T2, T6, and X, Y capacitor C 63, C18, C33, C42, C7, C4, C10 forms, and surge protects by piezo-resistance R110, fuse F3, inductance L 3, L5, L6 forms, and full-wave rectification has BD1, and TH1 finishes.
Its principle is that the AC signal of input is passed through surge protection circuit R110, to the protection of surging signal, behind the signal process EMC protection circuit, leach interference then on the realization line, by the test of conduction interference, signal is undertaken exporting to PFC correcting circuit 2 after the rectification by BD1.
Described PFC correcting circuit 2 as shown in Figure 3, by U4 (chip MC33262), transformer T3 and voltage stabilizing didoe D3, D6, compositions such as Z3.
Its principle is that traditional bridge rectifier, capacitor filter can make the AC input current produce serious wave distortion, inject a large amount of high order harmonic components to electrical network, therefore the power factor of net side is not high, only has about 0.6, and electrical network and other electric equipment are caused serious harmonic pollution and interference.Introduce pfc circuit in the electronic power supply product, just can improve utilization ratio greatly electric energy.This circuit adopts active PFC chip to finish PF) 0.96 power factor (PF) index.
Constant- current source 3,4 is same circuit structure, is example with constant-current source 3, as Fig. 4, mainly by U7 (metal-oxide-semiconductor KE2A280Z), optocoupler U5, U9 (TLP181), benchmark U2 (TL431), comparator U6 (LM293), three machine pipe Q4 (PMBT3906), voltage-stabiliser tube Z1, Z3, Z4, Z5, Z6 (IN4752), transformer T4 forms.Output LED1 node is connected to outside light fixture, driving LED.
Its principle is the mode of the single-ended reverse exciting of employing, produce voltage reference with benchmark U2 (TL431) and export to comparator U6 (LM293), after being converted to voltage signal after by resistance R 32, the electric current of output light fixture also goes out to comparator, comparator and reference voltage compare, when output current exceeds set point, and comparator output counter-rotating, optocoupler U5 (TLP181) conducting, thereby the switch of control metal-oxide-semiconductor U7 the output energy is reduced, thereby it is stable that output current is kept.Triode Q4 (PMBT3906) receives the pwm control signal DIM of adjusting control circuit 5 outputs, reference voltage with this signal controlling benchmark U2 (TL431), this reference voltage is exported to comparator U6, thereby can realize variable output current, reaches the purpose of light modulation.
Brightness adjustment control power supply circuits 6, as Fig. 5, by U13 (metal-oxide-semiconductor KE2A280Z), optocoupler U14 (TLP181), transformer T7, benchmark U15 (TL431) forms.Output 7V, 5V is given to adjusting control circuit 5.
Its principle is to be+7V with the 400V DC conversion of signals that PFC correcting circuit 2 is exported, and+5V is the DC-DC conversion.
Alarm-monitor circuit 7 is as Fig. 6, by triode Q1, and Q3 (PMBT3906), not gate U1 (CD4096) forms.Input signal is the output of constant- current source 3,4, and alarm-monitor circuit 7 is exported to adjusting control circuit 5.
Its principle is by R23, and R100 monitors electric power outputting current, when no-voltage is exported, and WAINNING1,2 output low levels, anti-phase through U1 is high level, delivers to adjusting control circuit 5 as alarm signal.When no current was exported, CV1 was a low level, and through Q1, Q3 drives and is WAINNING3,4, and anti-phase through U1 is high level, delivers to adjusting control circuit 5 as alarm signal.
Adjusting control circuit 5, as Fig. 7, by CPU device U8 (Atemga8L), crystal X1 (7.3728M), optocoupler IC4, IC5 (6N137), optocoupler U3, U21 (TLP181), serial interface chip IC 1 (MAX3232), U12 (65HVD3082) forms.
Its principle is that the dim signal of outside input inserts by the RS485 bus, be converted to the data-signal of numeral through U12, be input to the serial ports of CPU U8, after having CPU to handle, with the light modulation instruction transformation is to need other pwm signal of level, export to constant- current source 3,4, reach dimming effect .CPU by gathering the alarm signal of alarm-monitor circuit 7 outputs, it is passed through serial ports, send the RS485 bus to by U12, the another one function of delivering to the processing .CPU of control centre is the function of virtual serial port, and the user is provided with the address of light fixture by this interface, this serial ports is converted to the RS232 level by IC1, outputing to external interface, carry out the setting of address. the function that optocoupler is realized is to isolate, in order to avoid circuit is punctured by outside surging signal.
Fig. 8 is the replacement circuit of adjusting control circuit 5, by CPU device U8 (Atemga8L), and crystal X1 (7.3728M), optocoupler IC1, IC2, IC4, IC5 (6N137), RS485 level shifter interface chip U3 (ISL8488), U12 (65HVD3082) forms.
Its principle is to realize the automatic distribution function in address of each light fixture by U3 and U8, U3 monitors the sense of input automatically, to receive that feedback information gives CPU U8, CPU carries out the address setting operation according to agreement, setting operation finishes, CPU sends the address setting order to next light fixture, thereby the address of finishing the whole system light fixture is provided with automatically.This function is the original creation function.
Certainly, the utility model is not limited to address the embodiment shown in the accompanying drawing, modification and equivalent transformation that the spirit of Fan Yiben creation is done, or adopt various deformation on this basis, all belong in the utility model protection range.
Claims (10)
1. a Dimmable LED constant-current drive circuit is characterized in that, comprises electromagnetic compatibility circuit (1), power factor correction circuit (2), some constant-current power supply circuits (3,4), brightness adjustment control power supply circuits (6), adjusting control circuit (5), wherein:
Lightning protection and electromagnetic compatibility circuit (1), input is connected with city's alternating current;
Power factor correction circuit (2), input is connected with electromagnetic compatibility circuit (1) output;
Some constant-current power supply circuits (3,4), input is connected with power factor correction circuit (2) output;
Brightness adjustment control power supply circuits (6), input is connected with power factor correction circuit (2) output;
The adjusting control circuit (5) of band serial line interface, input is connected with brightness adjustment control power supply circuits (6) output, and output is connected with some constant-current power supply circuits (3,4).
2. a kind of Dimmable LED constant-current drive circuit according to claim 1, it is characterized in that: also comprise alarm detection circuit (7), described alarm detection circuit (7) extracts alarm signal from constant-current power supply circuit (3,4), exports to adjusting control circuit (5) after identification is handled.
3. a kind of Dimmable LED constant-current drive circuit according to claim 2 is characterized in that: described alarm signal is the voltage signal of constant-current power supply circuit (3,4) output.
4. according to claim 1 or 2 or 3 described a kind of Dimmable LED constant-current drive circuits, it is characterized in that: described lightning protection and electromagnetic compatibility circuit (1) are 2 level electromagnetic compatibles, electric main is through inductance L 5, after L6, capacitor C 63 filtering, the protection of lightning protection piezo-resistance R110 surge, by common mode inhibition transformer T2, T6 and safety capacitor C 63, C18, C33, C42, C7, C4, C10 form 2 level electromagnetic compatibles, at 2 grades of transformer T2, the T6 output is provided with the L3 choke, leaches interference, exports to PFC correcting circuit (2) through full-wave rectification BD1 again.
5. according to claim 1 or 2 or 3 described a kind of Dimmable LED constant-current drive circuits, it is characterized in that: described power factor correction circuit (2) comprises step-up transformer T3, connect that transformer T3 is former, the Active PFC chip U4 of secondary both sides and peripheral Resistor-Capacitor Unit thereof, MOS switching tube Q2, voltage stabilizing didoe Z2, close by control MOS switching tube Q2 and to close, stop high order harmonic component output.
6. according to claim 1 or 2 or 3 described a kind of Dimmable LED constant-current drive circuits, it is characterized in that: described constant-current power supply circuit (3,4) adopt the single-ended reverse exciting mode, will be through the power supply of power factor correction circuit (2) output, export to LED after importing the transformer T4 of this circuit, T4 is former at transformer, constant-current control circuit and reference voltage chip U2 that secondary both sides interconnective built-in metal-oxide-semiconductor galvanostat U7 of difference and peripheral Resistor-Capacitor Unit thereof are formed, comparator U6, the comparison circuit that three machine pipe Q4 and peripheral Resistor-Capacitor Unit are formed, T4 adjustable stabling current of level output of control transformer.
7. according to claim 1 or 2 or 3 described a kind of Dimmable LED constant-current drive circuits, it is characterized in that: described brightness adjustment control power supply circuits (6), will be through the power supply of power factor correction circuit (2) output, import step-down behind the transformer T7 of this circuit and export the power supply of 2 groups of different voltages, use for adjusting control circuit (5), wherein 1 group of power supply is in former, the secondary both sides of transformer T7 difference interconnective built-in metal-oxide-semiconductor galvanostat U13, reference voltage chip U15, peripheral Resistor-Capacitor Unit, optocoupler U14, the stabilized voltage power supply of T7 level output of control transformer.
8. according to claim 1 or 2 or 3 described a kind of Dimmable LED constant-current drive circuits, it is characterized in that
The adjusting control circuit of described band serial line interface (5) comprising:
Central processing unit CPU device U8 and peripheral Resistor-Capacitor Unit, crystal X1 form plug-in control centre;
The serial interface circuit that the 232 serial interface chip IC 1 that are connected with control centre are formed receives control signal or network monitoring signal;
The serial ports of computers interface circuit RS485 serial interface circuit that RS485 serial interface chip U12 that is connected with control centre and peripheral cell, transformer T9 form, the user is provided with the address of light fixture by this interface, this serial ports is converted to the RS232 level by IC1, output to external interface, carry out the setting of address, with the light modulation instruction transformation is to need other pwm signal of level, export to constant-current source 3,4, reach dimming effect, optocoupler IC4 wherein is set, and IC5 carries out Signal Spacing, in order to avoid circuit is punctured by outside surging signal.
9. according to claim 1 or 2 or 3 described a kind of Dimmable LED constant-current drive circuits, it is characterized in that the adjusting control circuit (5) of described band serial line interface, comprising:
Central processing unit CPU device U8 and peripheral Resistor-Capacitor Unit, crystal X1 form built-in control program control centre;
The serial ports of computers interface circuit RS485 serial interface circuit that RS485 serial interface chip U12 that is connected with control centre and peripheral cell, transformer T9 form, the user is provided with the address of light fixture by this interface, this serial ports is converted to the RS232 level by IC1, output to external interface, carry out the setting of address, with the light modulation instruction transformation is to need other pwm signal of level, export to constant-current source (3,4), reach dimming effect, optocoupler IC4 wherein is set, IC5 carries out Signal Spacing, in order to avoid circuit is punctured by outside surging signal
The serial ports of computers interface circuit RS485 serial interface circuit that the RS485 serial interface chip U3 that is connected with control centre and peripheral cell are formed is realized the automatic distribution function in address of each light fixture.
10. according to claim 2 or 3 described a kind of Dimmable LED constant-current drive circuits, it is characterized in that:
Described alarm-monitor circuit (7) comprises the led circuit sample circuit, takes a sample again through triode Q1 from constant-current source, and the Q3 amplification exports not gate U1 to, exports to adjusting control circuit (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200578444U CN201450636U (en) | 2009-06-04 | 2009-06-04 | LED constant-current drive circuit capable of regulating light |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009200578444U CN201450636U (en) | 2009-06-04 | 2009-06-04 | LED constant-current drive circuit capable of regulating light |
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| CN201450636U true CN201450636U (en) | 2010-05-05 |
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| CN2009200578444U Expired - Lifetime CN201450636U (en) | 2009-06-04 | 2009-06-04 | LED constant-current drive circuit capable of regulating light |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101572972B (en) * | 2009-06-04 | 2014-10-01 | 广州冠今电子科技有限公司 | Dimmable LED constant-current drive circuit |
| CN105048797A (en) * | 2015-06-13 | 2015-11-11 | 中山市韩科电器有限公司 | Filter circuit for electromagnetic heating of electromagnetic type heating electric cooker |
| CN106163014A (en) * | 2016-08-31 | 2016-11-23 | 周鸿德 | LED with inductance step-down |
| CN107071960A (en) * | 2017-01-17 | 2017-08-18 | 宁波犀谷智能科技有限公司 | A kind of intelligent LED lamp |
-
2009
- 2009-06-04 CN CN2009200578444U patent/CN201450636U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101572972B (en) * | 2009-06-04 | 2014-10-01 | 广州冠今电子科技有限公司 | Dimmable LED constant-current drive circuit |
| CN105048797A (en) * | 2015-06-13 | 2015-11-11 | 中山市韩科电器有限公司 | Filter circuit for electromagnetic heating of electromagnetic type heating electric cooker |
| CN106163014A (en) * | 2016-08-31 | 2016-11-23 | 周鸿德 | LED with inductance step-down |
| CN107071960A (en) * | 2017-01-17 | 2017-08-18 | 宁波犀谷智能科技有限公司 | A kind of intelligent LED lamp |
| CN107071960B (en) * | 2017-01-17 | 2018-09-07 | 宁波光谷智能科技有限公司 | A kind of intelligent LED lamp |
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