CN201682668U - Power supply with light adjusting function for LED (light-emitting diode) lamp - Google Patents
Power supply with light adjusting function for LED (light-emitting diode) lamp Download PDFInfo
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- CN201682668U CN201682668U CN201020174936.3U CN201020174936U CN201682668U CN 201682668 U CN201682668 U CN 201682668U CN 201020174936 U CN201020174936 U CN 201020174936U CN 201682668 U CN201682668 U CN 201682668U
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Abstract
The utility model relates to a power supply with the light adjusting function for an LED (light-emitting diode) lamp, which is mainly a working power supply capable of leading an AC-DC power supply conversion module to control power supplied for the LED lamp by a pulse width modulation control circuit through a power switch and an output circuit, and obtains output current at the output end of an input circuit in a feedback manner so as to achieve the purpose of stabilizing the current. The output circuit is connected with a light adjusting module. When the light adjusting module receives a light adjusting signal input by a non-polarity light adjustor, the magnitude of feedback current at the output end of the output circuit is changed, so as to lead the pulse width modulation control circuit to change the output current of the output circuit, thereby achieving the purpose of light adjusting. Therefore, the purpose of light adjusting can be achieved under the framework of a single-stage power supply conversion circuit (AC/DC), so as to increase the entire efficiency.
Description
Technical field
The utility model is about a kind of led lamp power supply unit, refers to a kind of led lamp power supply unit that dimming function can be provided under single-stage power supply change-over circuit (AC/DC) framework especially.
Background technology
As shown in Figure 3, be a kind of known led lamp power supply unit, it comprises that an alternating current-direct current (AC/DC) power supply changeover device 70 and a direct current are to direct current (DC/DC) transducer 80; Wherein, this AC-DC converter 70 comprises a transformer T, the primary side of transformer T sets up a filter circuit 71 separately, one rectification circuit 72, one power switch 73 and a PWM controller 74, electric main is to deliver to transformer T primary side after the DC power supply via filter circuit 71 and rectification circuit 72 as filter rectification, the primary side of transformer T is to be connected with power switch 73 again, its secondary side then sees through an output circuit 75 and with this direct current direct current transducer 80 is connected, and aforementioned power switches 73 is to be subjected to the turn-on cycle of PWM controller 74 controls with decision transformer T primary side, thereby output circuit 75 output dc voltages by secondary side, the output current of output circuit 75 will be feedback to PWM controller 74 again, by the switch periods of PWM controller 74 adjustment power switchs 73, to reach the purpose of regulated output voltage.
Because the output brightness of led lamp is relevant with the current strength of working power, therefore must further adopt direct current that direct current transducer 80 is carried out current stabilization.This direct current contains the control unit 81 of built-in pulse-width modulation (PWM) controller to direct current transducer 80, to carry out direct current direct current is changed; Aforementioned again control unit 81 further provides a brightness adjustment control pin (DIM), with the PWM form light modulation signal of accepting to send into the outside, see through the control of internal logic lock, change the size of current that exports led lamp to, to adjust the brightness of led lamp.
Aforementioned led lamp power supply unit provides functions such as electric main power supply and light modulation, in order to satisfy aforementioned functional, must adopt two-stage circuit, previous stage is made AC-DC conversion, back one-level is made current stabilization and is handled and dimming function, but two-stage circuit all can have energy loss, no matter from whole efficiency or become originally, all has and can treat improved space.
See also shown in Figure 4 again, announcement has another kind of led lamp power supply unit, it can reach the purpose of stablizing output current under the single-stage framework, this led lamp power supply unit comprises a transformer T, the primary side of transformer T sets up a filter circuit 91 separately, one rectification circuit 92, one power switch 93, the control unit 90 of one circuit of power factor correction 94 and a built-in PWM controller, electric main will be delivered to transformer T primary side after via filter rectification and power factor correction after the DC power supply, and the primary side of transformer T is to be connected with power switch 93, its secondary side then sees through an output circuit 95 and is connected with the led lamp (not shown), and aforementioned power switches 93 is controlled unit 90 controls turn-on cycles with decision transformer T primary side, thereby output circuit 95 output dc voltages by secondary side, the output of output circuit 95 is to see through a constant current constant voltage (CC/CV) circuit 96 again, one optical coupler 97 is feedback to control unit 90, by the switch periods of control unit 90 adjustment power switchs 93, with regulated output voltage and electric current.
Because the output circuit 95 of aforementioned led lamp power supply unit sees through constant current constant voltage controller 96 and feedbacks to control unit 90, make control unit 90 regulate the switch periods of power switch 93, and under single-stage change-over circuit framework, provide the voltage stabilization and current stabilization function.Yet described power supply unit does not still have dimming function, can't satisfy the requirement that present led lamp gradually is required to possess dimming function.
From the above, led lamp power supply unit of the prior art still has not the practical part of distribution to the greatest extent, thus need to be further reviewed, and seek feasible solution.
The utility model content
Therefore, main purpose of the present invention is to provide a kind of led lamp power supply unit with dimming function, and it can reach light modulation and current stabilization purpose under the framework of single-stage power supply change-over circuit (AC/DC).
For reaching the major technique means that aforementioned purpose takes is to make aforementioned led lamp power supply unit with dimming function include:
One power of alterating and direct current modular converter mainly is the control unit that sets up a filter circuit, a rectification circuit, a power switch, a circuit of power factor correction and a built-in PWM controller in the primary side of a transformer separately; Wherein, the controlled unit controls of this power switch is with the turn-on cycle of decision transformer primary side; And the secondary side of transformer is provided with an output circuit, and this output circuit sees through a constant current constant voltage controller again and is connected with the back coupling end of aforementioned control unit;
One light-adjusting module has a light modulation signal input end and a bucking voltage output, and this bucking voltage output is the feedback current input that is connected to the constant current constant voltage controller;
Aforementioned power of alterating and direct current modular converter is that the output with its output circuit is connected with a led lamp, the light modulation signal input end of this light-adjusting module is to be connected with a dimmer, to accept the PWM form light modulation signal of this dimmer input, when light-adjusting module is received a light modulation signal, to produce the bucking voltage of a correspondence at voltage output end, and be applied on the constant current constant voltage controller feedback current input, change the feedback current size that the constant current constant voltage controller is obtained from output circuit thus, this feedback current is through feedbacking to the control unit of power of alterating and direct current modular converter, see through the turn-on cycle of adjusting power switch immediately, to adjust the output current that output circuit exports led lamp to, because the brightness of led lamp is relevant with current strength, output current change when the power of alterating and direct current modular converter, the brightness of led lamp also changes simultaneously, thus, the present invention only adopts single-stage power supply change-over circuit framework, just can reach the purpose of current stabilization and light modulation simultaneously, with regard to whole efficiency, significantly promote.
Description of drawings
Fig. 1 is the detailed circuit diagram of a preferred embodiment of the present invention.
Fig. 2 is the detailed circuit diagram of the another preferred embodiment of the present invention.
Fig. 3 is the detailed circuit diagram of existing two-stage type led lamp power supply unit.
Fig. 4 is the detailed circuit diagram of existing single stage type led lamp power supply unit.
[main element symbol description]
10 power of alterating and direct current modular converters
11 filter circuits, 12 rectification circuits
13 power switchs, 14 circuit of power factor correction
15 control units, 16 output circuits
17 constant current constant voltage controllers, 18 optical couplers
20 light-adjusting modules, 21 rectification circuits
22 drive circuits, 23 light modulation signal input ends
24 bucking voltage outputs, 30 led lamps
40 nonpolarity dimmers 50 are analog the polarity dimmer
70 AC-DC converter, 71 filter circuits
72 rectification circuits, 73 power switchs
74 PWM controller, 75 output circuits
80 direct currents are to direct current transducer 81 control units
90 control units, 91 filter circuits
92 rectification circuits, 93 power switchs
94 circuit of power factor correction, 95 output circuits
96 constant current constant voltage controllers, 97 optical couplers
Embodiment
As shown in Figure 1, the present invention includes a power of alterating and direct current modular converter 10 and a light-adjusting module 20, the output of this power of alterating and direct current modular converter 10 is to be connected with a led lamp 30, the input of this light-adjusting module 20 then is connected with a nonpolarity dimmer 40, to accept the PWM form light modulation signal of this dimmer input; Wherein:
This power of alterating and direct current modular converter 10 mainly is the control unit 15 that sets up a filter circuit 11, a rectification circuit 12, a power switch 13, a circuit of power factor correction 14 and a built-in PWM controller at the primary side of a transformer T separately; Wherein, this power switch 13 is controlled unit 15 controls turn-on cycles with decision transformer T primary side; The secondary side of transformer T is provided with an output circuit 16 again, and the output of this output circuit 16 is connected with several resistance R respectively
SENSE, R2, R3-R5, wherein resistance R
SENSE, R2 constitutes an output current detecting circuit, the output node of this resistance R 2 is connected to a constant current constant voltage controller 17.
Have two groups of OP1, OP2 in this constant current constant voltage controller 17, carry out constant current constant voltage control respectively, wherein an OP2 carries out voltage stabilizing control, its anode input connects a Zener diode, so that the reference voltage of a 2.5V to be provided, its negative terminal sees through divider resistance R7, R8 and detect an output voltage V on the resistance R 3 of output circuit 16 outputs
OutAnd another OP1 carries out current stabilization control, and its anode is a reference voltage end, in the present embodiment, and the reference voltage V on this reference voltage end
Ref 'Be the reference voltage V that 2.5V is provided by the OP2 anode
RefSupply after resistance R 4, R5 dividing potential drop, its negative terminal is to constitute a feedback current input A, and is connected with aforementioned output current detecting circuit;
Moreover, the output of two OP1, OP2 is that the common optical coupler 18 that sees through is connected with the back coupling end of control unit 15, by feedbacking to control unit 15,, reach the purpose of current stabilization and voltage stabilizing to regulate output current/voltage from output current, output voltage that output circuit 16 detects.
This light-adjusting module 20 has a light modulation signal input end 23 and a bucking voltage output 24, wherein, light modulation signal input end 23 is to be connected with the nonpolarity dimmer 40 of an outside, to accept the light modulation signal of nonpolarity dimmer 40 pulse-width modulation of being sent into (PWM) form, this bucking voltage output 24 is to be connected on the feedback current input A of constant current constant voltage controller 17 again, in the present embodiment, the bucking voltage VC6 that this bucking voltage output 24 produces sees through divider resistance R1, the R2 dividing potential drop is after-applied on the feedback current input A of constant current constant voltage controller 17, use and look nonpolarity the bucking voltage VC6 that light modulation signal that dimmer 40 sends produces a correspondence, and then make control unit 15 adjust the output current of output circuit 16, thereby change the brightness of led lamp, and then reach the purpose of light modulation.
The concrete structure of aforementioned light-adjusting module 20 and operation principle are described in further detail as the back:
In the present embodiment, this light-adjusting module 20 comprises that a rectification circuit 21, one drive circuit 22 and charge and discharge electric capacity C6, this rectification circuit 21 is to be made of a bridge rectifier, its input is to be connected with nonpolarity dimmer 40, its output is to be connected to drive circuit 22, in the present embodiment, the driving power end P of this drive circuit 22 be with aforementioned constant current constant voltage controller 17 wherein the anode of an OP2 obtain the working power of 2.5V, can provide an accessory power supply more in addition thus.And drive circuit 22 is by a NPN transistor Q18, one PNP transistor Q17 forms, two transistor Q18, the base stage of Q17 is to see through a resistance R 45 respectively, R53 is connected to the output of rectification circuit 21, the connected node of NPN transistor Q18 emitter and PNP transistor Q17 emitter then is connected to and charges and discharge electric capacity C6, NPN transistor Q18 again, PNP transistor Q17 operates in saturation region and cut-off region respectively, charge and discharge discharging and recharging of electric capacity C6 with decision, when NPN transistor Q18 conducting, the capacitance voltage VC6 that charges and discharge electric capacity C6 rises, again when PNP transistor Q17 conducting, the capacitance voltage VC6 that charges and discharge electric capacity C6 then descends, thus, this capacitance voltage VC6 that charges and discharge electric capacity C6 can determine that with cycle (duty) width of PWM light modulation signal mean value is at 0～2.5V (VCE that ignores BJT).
As the Duty=0 of PWM light modulation signal, just do not carry out dimming function, the voltage (V on this constant current constant voltage controller 17 feedback current input A
SENSE) by output current I
o* resistance R
SENSEDecision, because constant current constant voltage controller 17 inner OP1 are connected with aforementioned feedback current input A with negative terminal, its anode then sees through divider resistance R4, R5 and obtains a reference voltage V
Ref ',, reach the function of stabling current thus because the steady-state value of OP1 negative terminal must equal the reference voltage of anode.
When the Duty of PWM light modulation signal is not equal to 0, so will carry out dimming function, the OP1 anode of aforementioned execution stabling current still sees through divider resistance R4, R5 and obtains reference voltage V
Ref ', because OP1 negative terminal voltage V
SENSESteady-state value must equal the reference voltage V of anode
Ref ', and the voltage V of script OP1 negative terminal
SENSEBe I
o* R
SENSE, but after PWM light modulation signal adds, make after drive circuit 22 conductings to charge and discharge electric capacity C6 and discharge and recharge, (VC6 (R2/ (R1+R2)) is applied on the negative terminal of OP1, and the negative terminal voltage of OP1 is at this moment so a voltage is arranged
V '
SENSE=VC6 (R2/ (R1+R2))+I
o* R
SENSE, and V '
SENSE＞V
SENSE
Under status, constant current constant voltage controller 17 is feedback to the signal of control unit 15 and will be made control unit 15 judge output current I
oBe too high state, thereby will downgrade the output current (see through change output voltage) of output circuit 16, and then adjusted the brightness of led lamp 30, because the bucking voltage value (being VC6) of light-adjusting module 20 output is the cycle size according to PWM light modulation signal difference is arranged, so the bucking voltage value difference of output can be adjusted to different brightness with led lamp 30.Utilize previous designs, the present invention can have current stabilization and dimming function concurrently under the ac-dc power conversion circuit framework of single-stage.
Moreover, in the aforementioned embodiment, the reference voltage V of current stabilization usefulness OP1 in the working power of drive circuit 22, the constant current constant voltage controller 17 in the light-adjusting module 20
Ref 'All be to supply with the reference voltage end of OP2 from voltage stabilizing in the constant current constant voltage controller 17, under this situation, promptly need not be and an accessory power supply is provided in addition based on the demand of aforementioned working power and reference voltage, so have reducing cost, simplify the effect of circuit structure.In addition, when the reference voltage of supplying with the reference voltage end of OP2 when voltage stabilizing in the constant current constant voltage controller 17 is low, then resistance R 4, R5 dividing potential drop need not be passed through, reference voltage V can be supplied
RefGive OP1; On the other hand, the bucking voltage of bucking voltage output 24 also can be passed through resistance R 1, R2 dividing potential drop, can be applied directly on the feedback current input A of constant current constant voltage controller 17.
See also shown in Figure 2 again, it is the another preferred embodiment of the present invention, its overall architecture and last embodiment are roughly the same, difference is on the bucking voltage output of this light-adjusting module 20 that further parallel connection is provided with one and analog polarity dimmer 50 is arranged, thus, led lamp power supply unit of the present invention is carried out the dimming function except that accepting non-polar light modulation signal, also can accept analog and has the light modulation signal of polarity to carry out light modulation.
Claims (9)
1. the led lamp power supply unit with dimming function is characterized in that, includes:
One power of alterating and direct current modular converter mainly is the control unit that sets up a filter circuit, a rectification circuit, a power switch, a circuit of power factor correction and a built-in PWM controller in the primary side of a transformer separately; Wherein, the controlled unit controls of this power switch is with the turn-on cycle of decision transformer primary side; The secondary side of transformer is provided with an output circuit again, and this output circuit sees through a constant current constant voltage controller again and is connected with the back coupling end of aforementioned control unit;
One light-adjusting module has a light modulation signal input end and a bucking voltage output, and this bucking voltage output is connected to the feedback current input of constant current constant voltage controller.
2. the led lamp power supply unit with dimming function as claimed in claim 1, it is characterized in that, the output of this output circuit is connected with several resistance respectively, constituting an output current detecting circuit and an output voltage detecting circuit respectively, and be connected to the constant current constant voltage controller respectively;
Have two groups of OP1, OP2 in this constant current constant voltage controller, carry out constant current constant voltage control respectively, wherein an OP2 carries out voltage stabilizing control, and its anode input connects a Zener diode, so that reference voltage to be provided, its negative terminal sees through a component piezoresistance and detect an output voltage on the output circuit output;
Another OP1 carries out current stabilization control, and its anode is a reference voltage end, and its negative terminal is to constitute a feedback current input, and is connected with aforementioned output current detecting circuit;
The output of two OP1, OP2 is that the common optical coupler that sees through is connected with the back coupling end of control unit.
3. the led lamp power supply unit with dimming function as claimed in claim 2, it is characterized in that, this light-adjusting module comprises that a rectification circuit, one drive circuit and charge and discharge electric capacity, the input of this rectification circuit is to be connected with a nonpolarity dimmer, its output is to be connected to drive circuit, this drive circuit output is and charges and discharge electric capacity and be connected, discharges and recharges to control it.
4. the led lamp power supply unit with dimming function as claimed in claim 3, it is characterized in that, this drive circuit is made up of a NPN transistor, a PNP transistor, the base stage of two transistor is to see through the output that a resistance is connected to rectification circuit respectively respectively, and the connected node of NPN transistor emitter and PNP emitter then is connected to and charges and discharge electric capacity.
5. as the described led lamp power supply unit of each claim in the claim 2 to 4 with dimming function, it is characterized in that, the drive circuit power end of this light-adjusting module is to be connected with the anode of an OP2 in the constant current constant voltage controller, to obtain working power;
Another OP1 anode is to obtain reference voltage by the anode of aforementioned OP2 in this constant current constant voltage controller.
6. the led lamp power supply unit with dimming function as claimed in claim 5 is characterized in that, another OP1 anode is to obtain reference voltage by the anode of aforementioned OP2 after a component piezoresistance dividing potential drop in this constant current constant voltage controller.
7. the led lamp power supply unit with dimming function as claimed in claim 5 is characterized in that, the drive circuit output of this light-adjusting module is to see through the feedback current input that a component piezoresistance is connected to this constant current constant voltage controller.
8. the led lamp power supply unit with dimming function as claimed in claim 7 is characterized in that the rectification circuit of this light-adjusting module is made of bridge rectifier.
9. as the described led lamp power supply unit of each claim in the claim 1 to 4 with dimming function, it is characterized in that further being provided with one with parallel way on the bucking voltage output of this light-adjusting module analogly has the polarity dimmer to connect.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW099111045A TWI435527B (en) | 2010-04-09 | 2010-04-09 | Light-emitting diode with dimming function |
| CN201020174936.3U CN201682668U (en) | 2010-04-09 | 2010-04-26 | Power supply with light adjusting function for LED (light-emitting diode) lamp |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW099111045A TWI435527B (en) | 2010-04-09 | 2010-04-09 | Light-emitting diode with dimming function |
| CN201020174936.3U CN201682668U (en) | 2010-04-09 | 2010-04-26 | Power supply with light adjusting function for LED (light-emitting diode) lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201682668U true CN201682668U (en) | 2010-12-22 |
Family
ID=50114928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020174936.3U Expired - Fee Related CN201682668U (en) | 2010-04-09 | 2010-04-26 | Power supply with light adjusting function for LED (light-emitting diode) lamp |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN201682668U (en) |
| TW (1) | TWI435527B (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US8378588B2 (en) | 2008-12-12 | 2013-02-19 | O2Micro Inc | Circuits and methods for driving light sources |
| CN103052223A (en) * | 2012-12-14 | 2013-04-17 | 浙江明烁电子科技有限公司 | LED (light-emitting diode) lamp control circuit and tent lamp |
| US8508150B2 (en) | 2008-12-12 | 2013-08-13 | O2Micro, Inc. | Controllers, systems and methods for controlling dimming of light sources |
| US8698419B2 (en) | 2010-03-04 | 2014-04-15 | O2Micro, Inc. | Circuits and methods for driving light sources |
| US8866398B2 (en) | 2012-05-11 | 2014-10-21 | O2Micro, Inc. | Circuits and methods for driving light sources |
| US9030122B2 (en) | 2008-12-12 | 2015-05-12 | O2Micro, Inc. | Circuits and methods for driving LED light sources |
| US9232591B2 (en) | 2008-12-12 | 2016-01-05 | O2Micro Inc. | Circuits and methods for driving light sources |
| US9253843B2 (en) | 2008-12-12 | 2016-02-02 | 02Micro Inc | Driving circuit with dimming controller for driving light sources |
| CN105338689A (en) * | 2014-08-14 | 2016-02-17 | 欧普照明股份有限公司 | LED color modulation control circuit |
| US9386653B2 (en) | 2008-12-12 | 2016-07-05 | O2Micro Inc | Circuits and methods for driving light sources |
| CN110513615A (en) * | 2019-07-29 | 2019-11-29 | 厦门普为光电科技有限公司 | Adjustable light lamp tube |
| CN111918455A (en) * | 2019-05-07 | 2020-11-10 | 益力半导体股份有限公司 | LED lamp with identification and self-adaptive dimming driving system |
Families Citing this family (1)
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| CN102665344B (en) * | 2012-05-08 | 2014-08-27 | 浙江英飞特节能技术有限公司 | Dimming circuit |
-
2010
- 2010-04-09 TW TW099111045A patent/TWI435527B/en not_active IP Right Cessation
- 2010-04-26 CN CN201020174936.3U patent/CN201682668U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9386653B2 (en) | 2008-12-12 | 2016-07-05 | O2Micro Inc | Circuits and methods for driving light sources |
| US9232591B2 (en) | 2008-12-12 | 2016-01-05 | O2Micro Inc. | Circuits and methods for driving light sources |
| US8508150B2 (en) | 2008-12-12 | 2013-08-13 | O2Micro, Inc. | Controllers, systems and methods for controlling dimming of light sources |
| US9253843B2 (en) | 2008-12-12 | 2016-02-02 | 02Micro Inc | Driving circuit with dimming controller for driving light sources |
| US9030122B2 (en) | 2008-12-12 | 2015-05-12 | O2Micro, Inc. | Circuits and methods for driving LED light sources |
| US8378588B2 (en) | 2008-12-12 | 2013-02-19 | O2Micro Inc | Circuits and methods for driving light sources |
| US8698419B2 (en) | 2010-03-04 | 2014-04-15 | O2Micro, Inc. | Circuits and methods for driving light sources |
| US8866398B2 (en) | 2012-05-11 | 2014-10-21 | O2Micro, Inc. | Circuits and methods for driving light sources |
| CN103052223A (en) * | 2012-12-14 | 2013-04-17 | 浙江明烁电子科技有限公司 | LED (light-emitting diode) lamp control circuit and tent lamp |
| CN105338689B (en) * | 2014-08-14 | 2018-07-24 | 欧普照明股份有限公司 | A kind of LED tonings control circuit |
| CN105338689A (en) * | 2014-08-14 | 2016-02-17 | 欧普照明股份有限公司 | LED color modulation control circuit |
| CN111918455A (en) * | 2019-05-07 | 2020-11-10 | 益力半导体股份有限公司 | LED lamp with identification and self-adaptive dimming driving system |
| CN111918455B (en) * | 2019-05-07 | 2022-12-16 | 益力半导体股份有限公司 | LED lamp with identification and adaptive dimming driving system |
| CN110513615A (en) * | 2019-07-29 | 2019-11-29 | 厦门普为光电科技有限公司 | Adjustable light lamp tube |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201136126A (en) | 2011-10-16 |
| TWI435527B (en) | 2014-04-21 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101222 Termination date: 20160426 |