CN103491664A - Load actuating device and method for light emitting diode lamp and lighting device with light emitting diode lamp - Google Patents
Load actuating device and method for light emitting diode lamp and lighting device with light emitting diode lamp Download PDFInfo
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Abstract
The invention discloses a load actuating device and method for a light emitting diode lamp and a lighting device with the light emitting diode lamp. When the light emitting diode lamp is short-circuited, a low-pass filter is used for filtering high-frequency pulse width modulation signals output by a control chip and provides a direct-current low-voltage level for a pulse width modulation dimming pin of the control chip. Thus, the control chip can respond to the direct-current low-voltage level provided by the low-pass filter and completely stop outputting the pulse width modulation signals, and all parts in the load actuating device are protected against damage caused by the short circuit of the light emitting diode lamp.
Description
Technical field
The present invention relates to capacity load Driving technique field, and be particularly related to a kind of load drive device for light-emitting diode lamp tube and method and applied lighting device thereof.
Background technology
Along with the progress of semiconductor technology, luminosity and the luminous efficiency of light-emitting diode (light emitting diode, LED) promote constantly.Light-emitting diode is a kind of novel cold light source, have long service life, volume little, power-saving, pollute low, reliability is high, be applicable to the advantages such as volume production, and the applicable field of light-emitting diode institute is very extensive, backlight (backlight source) of lighting device (illumination apparatus), liquid crystal display (liquid crystal display, LCD) or large board etc. for example.
Take and have light-emitting diode lamp tube the lighting device of (LED lamp) is example, it can adopt and take booster circuit (boost circuit) or the power-switching circuit (buck circuit) of pulse-width modulation framework as basis (PWM-based) for the drive unit that drives light-emitting diode lamp tube.Yet; no matter be that employing is any; safeguard measure while for light-emitting diode lamp tube, being short-circuited (short circuit) is very imperfect; to such an extent as to likely can cause the damage of the part part in drive unit, may cause even in addition the catching fire of the part part in drive unit.
Summary of the invention
In view of this, an example embodiment of the present invention provides a kind of load drive device, and it comprises: power-switching circuit, control chip, and short-circuit protection circuit.Power-switching circuit is for receiving a direct current input voltage, and reacts on a pulse-width signal and provide a direct current output voltage to a light-emitting diode lamp tube.Control chip couples power-switching circuit, in order to produce described pulse-width signal to control the running of power-switching circuit, and control chip has the output pin of the described pulse-width signal of output and the impulse width modulation and light adjusting pin of adjusting the duty cycle (duty ratio) of described pulse-width signal.Short-circuit protection circuit is coupled between the output pin and impulse width modulation and light adjusting pin of control chip; for when light-emitting diode lamp tube is short-circuited; produce the impulse width modulation and light adjusting pin of a short-circuit protection signal to control chip, make according to this output pin of control chip stop exporting described pulse-width signal.
In the present invention's one example embodiment, power-switching circuit can be reduction voltage circuit, and this reduction voltage circuit can comprise: diode, inductance, power switch, and the first resistance.The negative electrode of diode is used for receiving described DC input voitage, and couples the first end of light-emitting diode lamp tube.The first end of inductance couples the anode of diode, and the second end of inductance couples the second end of light-emitting diode lamp tube.The drain electrode of power switch couples the anode of diode and the first end of inductance, and the grid of power switch is for receiving described pulse-width signal.The first resistance is coupled between the source electrode and an earthing potential of power switch.
In the present invention's one example embodiment, short-circuit protection circuit can be low pass filter, and this low pass filter comprises: the second resistance and electric capacity.The first end of the second resistance couples the grid of power switch and the output pin of control chip, and the second end of the second resistance couples the impulse width modulation and light adjusting pin of control chip.The first end of electric capacity couples the second end of the second resistance and the impulse width modulation and light adjusting pin of control chip, and the second end of electric capacity is coupled to described earthing potential.
Another example embodiment of the present invention provides a kind of lighting device, and it comprises: light-emitting diode lamp tube and above-mentioned carried load drive device.
An example embodiment more of the present invention provides a kind of load driving method, and it comprises: react on a pulse-width signal and an input direct voltage is converted to a direct current output voltage, providing according to this described VD to light-emitting diode lamp tube; And, when light-emitting diode lamp tube is short-circuited, reacts on low-pass filtering means (low-pass filtering means) and stop producing described pulse-width signal, and then stopping providing described VD to light-emitting diode lamp tube.
Based on above-mentioned; the present invention can be when light-emitting diode lamp tube be short-circuited; utilize low pass filter (; short-circuit protection circuit) the high-frequency pulsed width modulation signal of being exported with the filtering control chip; and provide the impulse width modulation and light adjusting pin of DC low-voltage level (that is, short-circuit protection signal) to control chip.Thus, control chip can react on the DC low-voltage level that low pass filter provides and (fully) stops the output pulse width modulation signal, makes according to this all parts in load drive device avoid being subject to the short circuit of light-emitting diode lamp tube and damage.
The accompanying drawing explanation
Fig. 1 has shown the schematic block diagram of the lighting device (illumination apparatus) 10 of the present invention's one example embodiment;
Fig. 2 has shown enforcement (implementation) schematic diagram of the lighting device 10 of Fig. 1;
Fig. 3 has shown the flow chart of the load driving method for light-emitting diode lamp tube of the present invention's one example embodiment.
[main element symbol description]
10: lighting device
101: light-emitting diode lamp tube
103: load drive device
105: power-switching circuit
107: control chip
109: short-circuit protection circuit
R1, Rcs, Rf: resistance
Ca, Cb, Cf: electric capacity
D1: diode
L1: inductance
The Q:(N type) power switch
GATE: the output pin of control chip
PWM_D: the impulse width modulation and light adjusting pin of control chip
VDDP: the operating power pin of control chip
GNDP: the grounding pin of control chip
CS: the gallon pin of control chip
VIN: the voltage input pin of control chip
RT: the frequency setting pin of control chip
LD: the direct current light modulation pin of control chip
ND: node
VND: node voltage
Vocp: overcurrent protection reference voltage
Ics: electric current
VDC_IN: DC input voitage
VDC_OUT: VD
PW: pulse-width signal
TS: triggering signal
LS: short-circuit protection signal
VDD: operating power
GND: earthing potential
S301, S303: each step of flow chart of the load driving method for light-emitting diode lamp tube of the present invention's one example embodiment
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and, with reference to accompanying drawing, the present invention is described in further detail.In accompanying drawing and specification embodiment, use the element/member of same reference numerals to represent same or similar part.
Fig. 1 is the schematic block diagram of the lighting device (illumination apparatus) 10 of the present invention's one example embodiment, and Fig. 2 has shown the enforcement schematic diagram of the lighting device 10 of Fig. 1.Please, in the lump with reference to Fig. 1 and Fig. 2, lighting device 10 comprises: light-emitting diode lamp tube (light emitting diode lamp, LED lamp) 101 and load drive device (load driving apparatus) 103.Wherein, light-emitting diode lamp tube 101 is coupled to load drive device 103, for reaction from the VD VDC_OUT of load drive device 103 and luminous; In addition, load drive device 103 is for receiving through rectification and filtered DC input voitage VDC_IN, and react on pulse width modulation controlled means (pulse width modulation control means, PWM control means) and provide VD VDC_OUT to light-emitting diode lamp tube 101.
More clearly say; load drive device 103 comprises: power-switching circuit (power conversion circuit) 105, control chip (control chip) 107, short-circuit protection circuit (short-circuit protection circuit) 109, resistance (resistor) R1, and electric capacity (capacitor) Ca and Cb.Wherein, power-switching circuit 105 is for receiving DC input voitage VDC_IN, and reacts on pulse-width signal (PWM signal) PW exported from control chip 107 and provide VD VDC_OUT to light-emitting diode lamp tube 101.
In this example embodiment, power-switching circuit 105 can be reduction voltage circuit (buck circuit, but be not restricted to this, and it can comprise: diode (diode) (Schottky (Schottky) diode for example, but be not restricted to this) D1, inductance (inductor) L1, (N-type) power switch (power switch) Q, and resistance R cs.Wherein, the negative electrode of diode D1 (cathode) is for receiving DC input voitage VDC_IN, and couples the first end of light-emitting diode lamp tube 101.The first end of inductance L 1 couples the anode (anode) of diode D1, and the second end of inductance L 1 couples the second end of light-emitting diode lamp tube 101.
The drain electrode (drain) of (N-type) power switch Q couples the anode of diode D1 and the first end of inductance L 1, and the grid (gate) of (N-type) power switch Q is for receiving the pulse-width signal PW from control chip 107.Resistance R cs is coupled between the source electrode (source) and earthing potential (ground potential) GND of (N-type) power switch Q.
On the other hand, control chip 107 couples power-switching circuit 105, produce pulse-width signal PW in order to the power supply supply requirement that reacts on load (that is, light-emitting diode lamp tube 101), control according to this running of power-switching circuit (reduction voltage circuit) 105.In this example embodiment, control chip 107 can have output pin (output pin) GATE of output pulse width modulation signal PW and for impulse width modulation and light adjusting pin (the PWM dimming pin) PWM_D of duty cycle (duty cycle, duty ratio) of adjusting pulse-width signal PW.Wherein, the duty cycle of pulse-width signal PW can determine light-emitting diode lamp tube 101 bright/put out (ON/OFF) time scale.If the time of ' ON ' is longer, the brightness of light-emitting diode lamp tube 101 is higher; Otherwise, if the time of ' OFF ' is longer, the brightness of light-emitting diode lamp tube 101 is lower.Apparently, input to the pulse signal duty cycle of the impulse width modulation and light adjusting pin PWM_D of control chip 107 by change, just can adjust/determine the brightness of light-emitting diode lamp tube 101.
In addition; short-circuit protection circuit 109 is coupled between the output pin GATE and impulse width modulation and light adjusting pin PWM_D of control chip 107; for when light-emitting diode lamp tube 101 is short-circuited; (for example: DC low-voltage level (DC low voltage level)) LS, to the impulse width modulation and light adjusting pin PWM_D of control chip 107, makes the output pin GATE (fully) of control chip 107 stop output pulse width modulation signal PW according to this to produce the short-circuit protection signal.
More clearly say, short-circuit protection circuit 109 can be designed as low pass filter (low-pass filter, describe in detail after appearance again).Based on this, short-circuit protection circuit 109 can comprise: (filtering) resistance R _ f and (filtering) capacitor C f.Wherein, the first end of resistance R _ f couples the grid of (N-type) power switch Q and the output pin GATE of control chip 107, and the second end of resistance R _ f couples the impulse width modulation and light adjusting pin PWM_D of control chip 107; In addition, the first end of capacitor C f couples the second end of resistance R _ f and the impulse width modulation and light adjusting pin PWM_D of control chip 107, and the second end of capacitor C f is coupled to earthing potential GND.
Moreover, control chip 107 can also have gallon pin (current detection pin) CS, and the gallon pin CS of control chip 107 can be coupled to the first end (that is, the node ND between the source electrode of (N-type) power switch Q and the first end of resistance R cs) of resistance R cs.In this example embodiment; control chip 107 can by gallon pin CS with detection flows the electric current I cs through resistance R cs; and determine that according to this whether starting over current protection protection mechanism (over-current protection mechanism, OCP mechanism) protects load drive device 103 to avoid being subject to the impact of overcurrent and damage.
Clearer, the built-in overcurrent protection reference voltage of control chip 107 inner meeting (for example: Vocp).Once the voltage VND on node ND (; Rcs * Ics) be greater than the words of built-in overcurrent protection reference voltage Vocp; control chip 107 will start the over current protection protection mechanism; little by little reduce according to this duty cycle of the pulse-width signal PW that the output pin GATE of control chip 107 exports; until the voltage VND (Rcs * Ics) on node ND is less than built-in overcurrent protection reference voltage Vocp (that is, overcurrent no longer occurring).
At control chip 107, have under the condition of function of overcurrent protection; due to light-emitting diode lamp tube 101 when being short-circuited; voltage VND (Rcs * Ics) on node ND can rise to push up/arrive built-in overcurrent protection reference voltage Vocp rapidly; to such an extent as to the duty cycle of the pulse-width signal PW that the output pin GATE of control chip 107 exports can little by little reduce, until form the pulse-width signal PW of a high frequency.
Thus; because short-circuit protection circuit 109 has been designed to low pass filter; to such an extent as to the output short circuit protection signal is (constantly for short-circuit protection circuit 109; the DC low-voltage level) LS to the impulse width modulation and light adjusting pin PWM_D of control chip 107 (because high-frequency signal can't pass through; and this is also short-circuit protection circuit 109 to be designed to the reason of low pass filter), make according to this output pin GATE meeting (fully) of control chip 107 stop output pulse width modulation signal PW.In other words, the duty cycle of the pulse-width signal PW that now the output pin GATE of control chip 107 exports is 0%, to such an extent as to 10 of load drive device 103 and light-emitting diode lamp tubes can't form a complete circuit loop, thereby make all parts (components) in load drive device 103 avoid being subject to the short circuit of light-emitting diode lamp tube 101 and damage.
On the other hand, control chip 107 can also have voltage input pin (input pin) VIN and operating power pin (operation power pin) VDDP.And, control chip 107 can receive DC input voitage VDC_IN by voltage input pin VIN, and received DC input voitage VDC_IN is changed to (for example step-down) in operating power pin VDDP, above to produce operating power (VDD).Certainly, control chip 107 can also have the grounding pin GNDP that is coupled to earthing potential GND.
In addition, (triggering) capacitor C a is coupled between the operating power pin VDDP and impulse width modulation and light adjusting pin PWM_D of control chip 107, for start starting stage (the initial phase of light-emitting diode lamp tube 101 at load drive device 103, or even start new/starting stage of short circuit light-emitting diode lamp tube (not shown) not), the impulse width modulation and light adjusting pin PWM_D of triggering signal (trigger signal) TS to control chip 107 is provided, make according to this output pin GATE output (initial/default) the pulse-width signal PW of control chip 107 control the running of power-switching circuit 105.
Moreover control chip 107 can also have direct current light modulation pin (DC dimming pin) LD.Yet, because above-mentioned example embodiment is that impulse width modulation and light adjusting pin PWM_D by control chip 107 is adjusted with the brightness to light-emitting diode lamp tube 101, so in this example embodiment, the direct current light modulation pin LD of control chip 107 must be by capacitor C b to be coupled to earthing potential GND, and directly be coupled to the operating power pin VDDP (that is, the function of the direct current light modulation pin LD of forbidden energy (Disable) control chip 107) of control chip 107.
Hence one can see that, if will be adjusted with the brightness to light-emitting diode lamp tube 101 by the direct current light modulation pin LD of control chip 107, the impulse width modulation and light adjusting pin PWM_D of control chip 107 must change into directly be coupled to control chip 107 operating power pin VDDP (, the function of the impulse width modulation and light adjusting pin PWM_D of forbidden energy control chip 107), the direct current light modulation pin LD of control chip 107 can change into receive a default scoping adjustment voltage (for example: 0～0.25V, but be not restricted to this) with the brightness to light-emitting diode lamp tube 101, adjusted.
Even, control chip 107 can also have frequency setting pin (frequency setting pin) RT.Based on this, in this example embodiment, resistance R 1 can be coupled between the frequency setting pin RT and output pin GATE of control chip 107, and the frequency of the pulse-width signal PW according to this output pin GATE of control chip 107 exported is set/adjusted.Yet, if the words of the frequency of the pulse-width signal PW that fixedly the output pin GATE of control chip 107 exports, the frequency setting pin RT of control chip 107 can change into by resistance R 1 and be coupled to earthing potential GND (that is, the function of the frequency setting pin RT of forbidden energy control chip 107).
Knownly accordingly be; the present invention can be when light-emitting diode lamp tube 101 be short-circuited; the high-frequency pulsed width modulation signal PW that utilizes low pass filter (short-circuit protection circuit 109) to be exported with filtering control chip 107, and the impulse width modulation and light adjusting pin PWM_D of DC low-voltage level (short-circuit protection signal LS) to control chip 107 is provided.Thus; control chip 107 can react on the DC low-voltage level (short-circuit protection signal LS) that low pass filter (short-circuit protection circuit 109) provides and (fully) stops output pulse width modulation signal PW, makes according to this all parts in load drive device 103 avoid being subject to the short circuit of light-emitting diode lamp tube 101 and damage.
In addition, although the power-switching circuit 105 of above-mentioned example embodiment is to take reduction voltage circuit to describe as example, the present invention is not restricted to this.In other words, under the condition that does not affect the purpose that above-mentioned example embodiment will reach, power-switching circuit 105 can be changed into the power supply converting structure of other types, such as: booster circuit (boost circuit), liter-reduction voltage circuit (boost-buck circuit) etc., one is essential depending on actual design/application.
On the other hand, the content based on disclose/teaching of above-mentioned example embodiment, Fig. 3 has shown the flow chart of the load driving method for light-emitting diode lamp tube of the present invention's one example embodiment.Please refer to Fig. 3, the load driving method of this example embodiment comprises:
React on a pulse-width signal and an input direct voltage is converted to a direct current output voltage, provide according to this described VD to light-emitting diode lamp tube (step S301); And
When light-emitting diode lamp tube is short-circuited, reacts on low-pass filtering means and stop producing described pulse-width signal, and then stopping providing described VD to light-emitting diode lamp tube (step S303).
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (13)
1. a load drive device comprises:
One power-switching circuit, for receiving a direct current input voltage, and react on a pulse-width signal and provide a direct current output voltage to a light-emitting diode lamp tube;
One control chip, couple this power-switching circuit, for generation of this pulse-width signal, to control the running of this power-switching circuit, wherein this control chip has an output pin of this pulse-width signal of output and an impulse width modulation and light adjusting pin of adjusting a duty cycle of this pulse-width signal; And
One short-circuit protection circuit; be coupled between this output pin and this impulse width modulation and light adjusting pin; for when this light-emitting diode lamp tube is short-circuited, produce a short-circuit protection signal to this impulse width modulation and light adjusting pin, make according to this this output pin stop exporting this pulse-width signal.
2. load drive device as claimed in claim 1, wherein this power-switching circuit is at least a reduction voltage circuit, and this reduction voltage circuit comprises:
One diode, its negative electrode is used for receiving this DC input voitage, and couples the first end of this light-emitting diode lamp tube;
One inductance, its first end couples the anode of this diode, and its second end couples the second end of this light-emitting diode lamp tube;
One power switch, its drain electrode couples the anode of this diode and the first end of this inductance, and its grid is for receiving this pulse-width signal; And
One first resistance, be coupled between the source electrode and an earthing potential of this power switch.
3. load drive device as claimed in claim 2, wherein this short-circuit protection circuit is a low pass filter, and this low pass filter comprises:
One second resistance, its first end couples grid and this output pin of this power switch, and its second end couples this impulse width modulation and light adjusting pin; And
One electric capacity, its first end couples the second end and this impulse width modulation and light adjusting pin of this second resistance, and its second end is coupled to this earthing potential.
4. load drive device as claimed in claim 2, wherein:
This control chip also has a gallon pin of the first end that is coupled to this first resistance; And
This control chip by this gallon pin with detection flows the electric current through this first resistance, and determine according to this whether to start an over current protection protection mechanism.
5. load drive device as claimed in claim 1, wherein this control chip also has an operating power pin, and this load drive device also comprises:
One electric capacity, be coupled between this operating power pin and this impulse width modulation and light adjusting pin, a starting stage for starting this light-emitting diode lamp tube, provide a triggering signal to this impulse width modulation and light adjusting pin, makes according to this this output pin export this pulse-width signal.
6. load drive device as claimed in claim 5, wherein this control chip also has:
One voltage input pin, wherein this control chip receives this DC input voitage by this voltage input pin, and this received DC input voitage is changed to produce an operating power on this operating power pin; And
One grounding pin, be coupled to this earthing potential.
7. a lighting device comprises:
One light-emitting diode lamp tube, luminous for reacting on a direct current output voltage; And
One load drive device, couple this light-emitting diode lamp tube, and this load drive device comprises:
One power-switching circuit, for receiving a direct current input voltage, and react on a pulse-width signal and provide this VD to this light-emitting diode lamp tube;
One control chip, couple this power-switching circuit, for generation of this pulse-width signal, to control the running of this power-switching circuit, wherein this control chip has an output pin of this pulse-width signal of output and an impulse width modulation and light adjusting pin of adjusting a duty cycle of this pulse-width signal; And
One short-circuit protection circuit; be coupled between this output pin and this impulse width modulation and light adjusting pin; for when this light-emitting diode lamp tube is short-circuited, produce a short-circuit protection signal to this impulse width modulation and light adjusting pin, make according to this this output pin stop exporting this pulse-width signal.
8. lighting device as claimed in claim 7, wherein this power-switching circuit is at least a reduction voltage circuit, and this reduction voltage circuit comprises:
One diode, its negative electrode is used for receiving this DC input voitage, and couples the first end of this light-emitting diode lamp tube;
One inductance, its first end couples the anode of this diode, and its second end couples the second end of this light-emitting diode lamp tube;
One power switch, its drain electrode couples the anode of this diode and the first end of this inductance, and its grid is for receiving this pulse-width signal; And
One first resistance, be coupled between the source electrode and an earthing potential of this power switch.
9. lighting device as claimed in claim 8, wherein this short-circuit protection circuit is a low pass filter, and this low pass filter comprises:
One second resistance, its first end couples grid and this output pin of this power switch, and its second end couples this impulse width modulation and light adjusting pin; And
One electric capacity, its first end couples the second end and this impulse width modulation and light adjusting pin of this second resistance, and its second end is coupled to this earthing potential.
10. lighting device as claimed in claim 8, wherein:
This control chip also has a gallon pin of the first end that is coupled to this first resistance; And
This control chip by this gallon pin with detection flows the electric current through this first resistance, and determine according to this whether to start an over current protection protection mechanism.
11. lighting device as claimed in claim 7, wherein this control chip also has an operating power pin, and this load drive device also comprises:
One electric capacity, be coupled between this operating power pin and this impulse width modulation and light adjusting pin, a starting stage for starting this light-emitting diode lamp tube, provide a triggering signal to this impulse width modulation and light adjusting pin, makes according to this this output pin export this pulse-width signal.
12. lighting device as claimed in claim 11, wherein this control chip also has:
One voltage input pin, wherein this control chip receives this DC input voitage by this voltage input pin, and this received DC input voitage is changed to produce an operating power on this operating power pin; And
One grounding pin, be coupled to this earthing potential.
13. a load driving method comprises:
React on a pulse-width signal and an input direct voltage is converted to a direct current output voltage, provide according to this this VD to a light-emitting diode lamp tube; And
When this light-emitting diode lamp tube is short-circuited, reacts on low-pass filtering means and stop producing this pulse-width signal, and then stopping providing this VD to this light-emitting diode lamp tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210192510.4A CN103491664A (en) | 2012-06-12 | 2012-06-12 | Load actuating device and method for light emitting diode lamp and lighting device with light emitting diode lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210192510.4A CN103491664A (en) | 2012-06-12 | 2012-06-12 | Load actuating device and method for light emitting diode lamp and lighting device with light emitting diode lamp |
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| CN103491664A true CN103491664A (en) | 2014-01-01 |
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|---|---|---|---|
| CN201210192510.4A Pending CN103491664A (en) | 2012-06-12 | 2012-06-12 | Load actuating device and method for light emitting diode lamp and lighting device with light emitting diode lamp |
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| CN104244525A (en) * | 2014-09-12 | 2014-12-24 | 成都威邦科技有限公司 | LED drive system with linear dimming function |
| CN108282924A (en) * | 2018-02-28 | 2018-07-13 | 上思县东岽电子科技有限责任公司 | A kind of novel direct-current LED stall with goods spread out on the ground for sale lamp |
| CN112996184A (en) * | 2019-12-16 | 2021-06-18 | 苏州佳世达光电有限公司 | Solid-state light source dimming control circuit and projector using same |
| CN112996185A (en) * | 2019-12-16 | 2021-06-18 | 苏州佳世达光电有限公司 | Solid-state light source driving circuit and projector using same |
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| CN101783595A (en) * | 2010-03-05 | 2010-07-21 | 福建捷联电子有限公司 | Overpower compensating method and device for wide voltage-input flyback power supply |
| CN101801133A (en) * | 2010-01-26 | 2010-08-11 | 上海创月能源科技有限公司 | Driving power supply circuit of LED lamp |
| CN102083262A (en) * | 2011-01-26 | 2011-06-01 | 深圳茂硕电源科技股份有限公司 | Negative electrode-driven LED constant current source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101801133A (en) * | 2010-01-26 | 2010-08-11 | 上海创月能源科技有限公司 | Driving power supply circuit of LED lamp |
| CN101783595A (en) * | 2010-03-05 | 2010-07-21 | 福建捷联电子有限公司 | Overpower compensating method and device for wide voltage-input flyback power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104244525A (en) * | 2014-09-12 | 2014-12-24 | 成都威邦科技有限公司 | LED drive system with linear dimming function |
| CN108282924A (en) * | 2018-02-28 | 2018-07-13 | 上思县东岽电子科技有限责任公司 | A kind of novel direct-current LED stall with goods spread out on the ground for sale lamp |
| CN112996184A (en) * | 2019-12-16 | 2021-06-18 | 苏州佳世达光电有限公司 | Solid-state light source dimming control circuit and projector using same |
| CN112996185A (en) * | 2019-12-16 | 2021-06-18 | 苏州佳世达光电有限公司 | Solid-state light source driving circuit and projector using same |
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Application publication date: 20140101 |