CN101860202A - Buck chopper circuit, LED drive circuit and LED lamp - Google Patents
Buck chopper circuit, LED drive circuit and LED lamp Download PDFInfo
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- CN101860202A CN101860202A CN201010174682A CN201010174682A CN101860202A CN 101860202 A CN101860202 A CN 101860202A CN 201010174682 A CN201010174682 A CN 201010174682A CN 201010174682 A CN201010174682 A CN 201010174682A CN 101860202 A CN101860202 A CN 101860202A
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Abstract
The invention is applicable to the field of LED lamps, and provides a buck chopper circuit, an LED drive circuit and an LED lamp, wherein the buck chopper circuit comprises a filtering unit, a first-stage voltage-reducing unit, a second-stage voltage-reducing unit and a control unit. In the embodiment of the invention, the buck chopper circuit is provided with the first-stage voltage-reducing unit and the second-stage voltage-reducing unit; and compared with the adoption of one-stage voltage reduction, the adoption of two-stage voltage reduction can greatly reduce the input voltage under the condition of the same duty cycle, therefore, compared with the adoption of the one-stage voltage reduction, the adoption of the buck chopper circuit can greatly increase the input scope of the voltage under the precise that the input voltage is constant.
Description
Technical field
The invention belongs to the LED field of light fittings, relate in particular to a kind of buck circuit, led drive circuit and LED light fixture.
Background technology
The buck circuit BUCK transformer that is otherwise known as is a kind of basic DC/DC converter, can realize buck functionality in the DC/DC conversion.
Buck circuit is under the control of pwm control signal, the high voltage of input is converted to low-voltage output, the magnitude of voltage of output voltage is by the duty ratio size decision of pwm control signal, if under the same situation of input voltage, the duty ratio of pwm control signal is more little, and the magnitude of voltage of output voltage is more little; If under the same situation of output voltage, the duty ratio of pwm control signal is more little, the magnitude of voltage of input voltage is big more.
Under the constant prerequisite of output voltage, in order to improve the input range of voltage, must reduce duty ratio, but because the Effect on Performance of switching tube own makes the lower limit of duty ratio be restricted.Therefore, the input voltage range of existing buck circuit is limited.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of buck circuit, is intended to solve existing buck circuit and has the limited problem of input voltage range.
The embodiment of the invention is achieved in that a kind of buck circuit, and described buck circuit comprises:
The filter unit that is connected with power input is used for the clutter that filtering is imported, and suppresses the harmonic wave that circuit produces;
The first order pressure unit that input is connected with the output of described filter unit is used for that supply voltage is carried out the step-down first time and handles;
Input is connected with the output of described first order pressure unit, and the second level pressure unit of output termination load is used for that the supply voltage of handling through step-down is for the first time carried out the step-down second time again and handles; And
Voltage detecting input, voltage output end all connect the control unit of described second level pressure unit, be used for the change in voltage according to the output of described second level pressure unit, the voltage of the described second level of output control pressure unit output is the pwm control signal of predeterminated voltage.
In the said structure, described filter unit is filter capacitor C2, as the input of described filter unit and the positive pole of the described power input of output termination, second end of described filter capacitor C2 connects the negative pole and the ground of described power input to first end of described filter capacitor C2 simultaneously simultaneously.
In the said structure, described first order pressure unit comprises:
The first energy storage sectional pressure element, storage capacitor C3, the first unidirectional breakover element and the second unidirectional breakover element;
The input of the described first energy storage sectional pressure element is as the output of the described filter unit of input termination of described first order pressure unit, the output of the described first energy storage sectional pressure element is as first end of the output termination storage capacitor C3 of described first order pressure unit, second end of described storage capacitor C3 connects the input of the first unidirectional breakover element and the output of the second unidirectional breakover element simultaneously, the input of the described first energy storage sectional pressure element of output termination of the described first unidirectional breakover element, the input end grounding of the described second unidirectional breakover element.
In the said structure, the described first energy storage sectional pressure element is an inductance L 1, first end of described inductance L 1 is as the input of the first energy storage sectional pressure element, second end of described inductance L 1 is as the output of the first energy storage sectional pressure element, the described first unidirectional breakover element is Schottky diode D2, the anode of described Schottky diode D2 is as the input of the first unidirectional breakover element, the negative electrode of described Schottky diode D2 is as the output of the first unidirectional breakover element, the described second unidirectional breakover element is Schottky diode D3, the anode of described Schottky diode D3 is as the input of the second unidirectional breakover element, and the negative electrode of described Schottky diode D3 is as the output of the second unidirectional breakover element.
In the said structure, described second level pressure unit comprises the second energy storage sectional pressure element, filter capacitor C4, the 3rd unidirectional breakover element, switch element and the 3rd sectional pressure element, the input of the described second energy storage sectional pressure element connects the output of described first order pressure unit and the output of the 3rd unidirectional breakover element simultaneously as the input of described second level pressure unit, first end of the output termination filter capacitor C4 of the described second energy storage sectional pressure element, second end of described filter capacitor C4 connects the input of switch element and the input of the 3rd unidirectional breakover element simultaneously, first end of described filter capacitor C4 and second end connect respectively load positive power source terminal and negative power end, the control end of described switch element is as the voltage output end of the described control unit of control termination of second level pressure unit, the output of described switch element connects the voltage detecting input of control unit and the input of the 3rd sectional pressure element, the output head grounding of described the 3rd sectional pressure element simultaneously.
In the said structure, the described second energy storage sectional pressure element is an inductance L 2, first end of described inductance L 2 is as the input of the second energy storage sectional pressure element, second end of described inductance L 2 is as the output of the second energy storage sectional pressure element, the described the 3rd unidirectional breakover element is Schottky diode D4, the anode of described Schottky diode D4 is as the input of the 3rd unidirectional breakover element, the negative electrode of described Schottky diode D4 is as the output of the 3rd unidirectional breakover element, described switch element is metal-oxide-semiconductor Q1, the drain electrode of described metal-oxide-semiconductor Q1 is as the input of switch element, the grid of described metal-oxide-semiconductor Q1 is as the control end of switch element, the source electrode of described metal-oxide-semiconductor Q1 is as the output of switch element, described the 3rd sectional pressure element is current sampling resistor R3, first end of described current sampling resistor R3 is as the input of the 3rd sectional pressure element, and second end of described current sampling resistor R3 is as the output of the 3rd sectional pressure element.
In the said structure, described control unit comprises control chip, the source electrode of the described metal-oxide-semiconductor Q1 of voltage detecting input termination of described control chip, the voltage output end of described control chip connects the grid of described metal-oxide-semiconductor Q1, first end of the frequency setting terminating resistor R2 of described control chip, the second end ground connection of described resistance R 2, the output of the described filter unit of power supply termination of described control chip.
Another purpose of the embodiment of the invention is to provide a kind of led drive circuit, comprises the LED control circuit as load, and described led drive circuit also comprises above-mentioned buck circuit.
Another purpose of the embodiment of the invention is to provide a kind of LED light fixture, and described LED light fixture comprises above-mentioned led drive circuit.
In embodiments of the present invention, buck circuit has first order pressure unit and second level pressure unit, under the same situation of duty ratio, this buck circuit adopts the two-stage step-down to compare with adopting the one-level step-down, can reduce input voltage greatly, therefore under the constant prerequisite of output voltage, adopt this buck circuit to compare, can improve the input range of voltage greatly with the one-level reduction voltage circuit.
Description of drawings
Fig. 1 is the structure chart of the buck circuit that provides of the embodiment of the invention;
Fig. 2 is the exemplary circuit figure of the buck circuit that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The buck circuit that the embodiment of the invention provides has first order pressure unit and second level pressure unit, under the same situation of duty ratio, this buck circuit adopts the two-stage step-down to compare with adopting the one-level step-down, can reduce input voltage greatly, therefore under the constant prerequisite of output voltage, adopt this buck circuit to compare, can improve the input range of voltage greatly with the one-level reduction voltage circuit.
Fig. 1 shows the structure of the buck circuit that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
Buck circuit comprises filter unit 100, first order pressure unit 200, second level pressure unit 300 and control unit 400.
The input of first order pressure unit 200 is connected with the output of filter unit 100, is used for that supply voltage is carried out the step-down first time and handles;
The input of second level pressure unit 300 is connected with the output of first order pressure unit 200, and the load of output termination is used for that the supply voltage of handling through step-down is for the first time carried out the step-down second time again and handles;
The voltage sample end of the voltage detecting input termination second level pressure unit 300 of control unit 400, voltage output end connects the control end of second level pressure unit 300, be used for the change in voltage according to 300 outputs of second level pressure unit, the voltage of output control second level pressure unit 300 outputs is the pwm control signal of predeterminated voltage.
Fig. 2 shows the exemplary circuit structure of the buck circuit that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
As one embodiment of the invention, filter unit 100 is filter capacitor C2, as the input of filter unit 100 and the positive pole of output termination power input, second end of filter capacitor C2 connects the negative pole and the ground of power input to first end of filter capacitor C2 simultaneously simultaneously.
As one embodiment of the invention, first order pressure unit 200 comprises:
The first energy storage sectional pressure element 201, storage capacitor C3, the first unidirectional breakover element 202 and the second unidirectional breakover element 203;
The input of the first energy storage sectional pressure element 201 is as the output of the input termination filter unit 100 of first order pressure unit 200, the output of the first energy storage sectional pressure element 201 is as first end of the output termination storage capacitor C3 of first order pressure unit 200, second end of storage capacitor C3 connects the input of the first unidirectional breakover element 202 and the output of the second unidirectional breakover element 203 simultaneously, the input of the output termination first energy storage sectional pressure element 201 of the first unidirectional breakover element 202, the input end grounding of the second unidirectional breakover element 203.
As one embodiment of the invention, the first energy storage sectional pressure element 201 is an inductance L 1, first end of inductance L 1 is as the input of the first energy storage sectional pressure element 201, second end of inductance L 1 is as the output of the first energy storage sectional pressure element 201, the first unidirectional breakover element 202 is Schottky diode D2, the anode of Schottky diode D2 is as the input of the first unidirectional breakover element 202, the negative electrode of Schottky diode D2 is as the output of the first unidirectional breakover element 202, the second unidirectional breakover element 203 is Schottky diode D3, the anode of Schottky diode D3 is as the input of the second unidirectional breakover element 203, and the negative electrode of Schottky diode D3 is as the output of the second unidirectional breakover element 203.
As one embodiment of the invention, second level pressure unit 300 comprises the second energy storage sectional pressure element 301, filter capacitor C4, the 3rd unidirectional breakover element 302, switch element 303 and the 3rd sectional pressure element 304, the input of the second energy storage sectional pressure element 301 connects the output of first order pressure unit 200 and the output of the 3rd unidirectional breakover element 302 simultaneously as the input of second level pressure unit 300, first end of the output termination filter capacitor C4 of the second energy storage sectional pressure element 301, second end of filter capacitor C4 connects the input of switch element 303 and the input of the 3rd unidirectional breakover element 302 simultaneously, first end of filter capacitor C4 and second end connect respectively load positive power source terminal and negative power end, the control end of switch element 303 is as the voltage output end of the control termination control unit 400 of second level pressure unit 300, the output of switch element 303 connects the voltage detecting input of control unit 400 and the input of the 3rd sectional pressure element 304, the output head grounding of the 3rd sectional pressure element 304 simultaneously.
As one embodiment of the invention, the second energy storage sectional pressure element 301 is an inductance L 2, first end of inductance L 2 is as the input of the second energy storage sectional pressure element 301, second end of inductance L 2 is as the output of the second energy storage sectional pressure element 301, the 3rd unidirectional breakover element 302 is Schottky diode D4, the anode of Schottky diode D4 is as the input of the 3rd unidirectional breakover element 302, the negative electrode of Schottky diode D4 is as the output of the 3rd unidirectional breakover element 302, switch element 303 is metal-oxide-semiconductor Q1, the drain electrode of metal-oxide-semiconductor Q1 is as the input of switch element 303, the grid of metal-oxide-semiconductor Q1 is as the control end of switch element 303, the source electrode of metal-oxide-semiconductor Q1 is as the output of switch element 303, the 3rd sectional pressure element 304 is current sampling resistor R3, first end of current sampling resistor R3 is as the input of the 3rd sectional pressure element 304, and second end of current sampling resistor R3 is as the output of the 3rd sectional pressure element 304.
As one embodiment of the invention, control unit 400 comprises control chip U1, the voltage detecting input CS of control chip U1 connects the source electrode of metal-oxide-semiconductor Q1, the voltage output end GATE of control chip U1 connects the grid of metal-oxide-semiconductor Q1, first end of the frequency setting end R_osc connecting resistance R2 of control chip U1, the second end ground connection of resistance R 2, the power end Vcc of control chip U1 connects the output of filter unit 100 by breakdown diode D1; The interior voltage-stabilized power supply voltage end VDD of control chip U1, linearity light adjusting end LD (Linear Dimming bychanging the current limit threshold at current sense comparator) and pulse control end PWM D are connected, its tie point is used for providing stabilized power supply to control chip U1 by a bypass capacitor C 1 ground connection.
The embodiment of the invention also provides a kind of led drive circuit, comprises the LED control circuit as load, and led drive circuit also comprises above-mentioned buck circuit.
The embodiment of the invention also provides a kind of LED light fixture, comprises above-mentioned led drive circuit.
Be example with the LED light fixture below, the course of work of buck circuit described:
Control chip U1 gives the grid of metal-oxide-semiconductor Q1 by its voltage output end GATE output pwm control signal, the frequency of pwm control signal is by the parameter decision of resistance R 2, when pwm control signal is high level, metal-oxide-semiconductor Q1 conducting, when pwm control signal was low level, metal-oxide-semiconductor Q1 closed, duty ratio size by the control pwm control signal, the user carries out step-down by this buck circuit to input voltage, obtains predeterminated voltage, and detailed process is:
When pwm control signal is a high level, during metal-oxide-semiconductor Q1 conducting, the flow direction of source current is: inductance L 1-inductance L 2-load LED control circuit-metal-oxide-semiconductor Q1-current sampling resistor R3-ground, export to the LED control circuit behind the hypotensive effect of supply voltage through inductance L 1 and inductance L 2;
When pwm control signal is a low level, when metal-oxide-semiconductor Q1 closed, the energy storage on the inductance L 2 provided transient energy, its sense of current for load LED control circuit: inductance L 2-load LED control circuit-Schottky diode D4-inductance L 2.
In the process of step-down, the voltage detecting input CS of control chip U1 does not stop to detect the voltage of current sampling resistor R3, the voltage of current sampling resistor R3 reflects the output voltage of buck circuit, when the output voltage of buck circuit is not predeterminated voltage, control chip U1 adjusts the duty ratio of output pwm control signal, makes that the output voltage of buck circuit is a predeterminated voltage.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a buck circuit is characterized in that, described buck circuit comprises:
The filter unit that is connected with power input is used for the clutter that filtering is imported, and suppresses the harmonic wave that circuit produces;
The first order pressure unit that input is connected with the output of described filter unit is used for that supply voltage is carried out the step-down first time and handles;
Input is connected with the output of described first order pressure unit, and the second level pressure unit of output termination load is used for that the supply voltage of handling through step-down is for the first time carried out the step-down second time again and handles; And
Voltage detecting input, voltage output end all connect the control unit of described second level pressure unit, be used for the change in voltage according to the output of described second level pressure unit, the voltage of the described second level of output control pressure unit output is the pwm control signal of predeterminated voltage.
2. buck circuit as claimed in claim 1, it is characterized in that, described filter unit is filter capacitor C2, as the input of described filter unit and the positive pole of the described power input of output termination, second end of described filter capacitor C2 connects the negative pole and the ground of described power input to first end of described filter capacitor C2 simultaneously simultaneously.
3. buck circuit as claimed in claim 1 is characterized in that, described first order pressure unit comprises:
The first energy storage sectional pressure element, storage capacitor C3, the first unidirectional breakover element and the second unidirectional breakover element;
The input of the described first energy storage sectional pressure element is as the output of the described filter unit of input termination of described first order pressure unit, the output of the described first energy storage sectional pressure element is as first end of the output termination storage capacitor C3 of described first order pressure unit, second end of described storage capacitor C3 connects the input of the first unidirectional breakover element and the output of the second unidirectional breakover element simultaneously, the input of the described first energy storage sectional pressure element of output termination of the described first unidirectional breakover element, the input end grounding of the described second unidirectional breakover element.
4. buck circuit as claimed in claim 3, it is characterized in that, the described first energy storage sectional pressure element is an inductance L 1, first end of described inductance L 1 is as the input of the first energy storage sectional pressure element, second end of described inductance L 1 is as the output of the first energy storage sectional pressure element, the described first unidirectional breakover element is Schottky diode D2, the anode of described Schottky diode D2 is as the input of the first unidirectional breakover element, the negative electrode of described Schottky diode D2 is as the output of the first unidirectional breakover element, the described second unidirectional breakover element is Schottky diode D3, the anode of described Schottky diode D3 is as the input of the second unidirectional breakover element, and the negative electrode of described Schottky diode D3 is as the output of the second unidirectional breakover element.
5. buck circuit as claimed in claim 1, it is characterized in that, described second level pressure unit comprises the second energy storage sectional pressure element, filter capacitor C4, the 3rd unidirectional breakover element, switch element and the 3rd sectional pressure element, the input of the described second energy storage sectional pressure element connects the output of described first order pressure unit and the output of the 3rd unidirectional breakover element simultaneously as the input of described second level pressure unit, first end of the output termination filter capacitor C4 of the described second energy storage sectional pressure element, second end of described filter capacitor C4 connects the input of switch element and the input of the 3rd unidirectional breakover element simultaneously, first end of described filter capacitor C4 and second end connect respectively load positive power source terminal and negative power end, the control end of described switch element is as the voltage output end of the described control unit of control termination of second level pressure unit, the output of described switch element connects the voltage detecting input of control unit and the input of the 3rd sectional pressure element, the output head grounding of described the 3rd sectional pressure element simultaneously.
6. buck circuit as claimed in claim 5, it is characterized in that, the described second energy storage sectional pressure element is an inductance L 2, first end of described inductance L 2 is as the input of the second energy storage sectional pressure element, second end of described inductance L 2 is as the output of the second energy storage sectional pressure element, the described the 3rd unidirectional breakover element is Schottky diode D4, the anode of described Schottky diode D4 is as the input of the 3rd unidirectional breakover element, the negative electrode of described Schottky diode D4 is as the output of the 3rd unidirectional breakover element, described switch element is metal-oxide-semiconductor Q1, the drain electrode of described metal-oxide-semiconductor Q1 is as the input of switch element, the grid of described metal-oxide-semiconductor Q1 is as the control end of switch element, the source electrode of described metal-oxide-semiconductor Q1 is as the output of switch element, described the 3rd sectional pressure element is current sampling resistor R3, first end of described current sampling resistor R3 is as the input of the 3rd sectional pressure element, and second end of described current sampling resistor R3 is as the output of the 3rd sectional pressure element.
7. buck circuit as claimed in claim 6, it is characterized in that, described control unit comprises control chip, the source electrode of the described metal-oxide-semiconductor Q1 of voltage detecting input termination of described control chip, the voltage output end of described control chip connects the grid of described metal-oxide-semiconductor Q1, first end of the frequency setting terminating resistor R2 of described control chip, the second end ground connection of described resistance R 2, the output of the described filter unit of power supply termination of described control chip.
8. a led drive circuit comprises the LED control circuit as load, it is characterized in that, described led drive circuit also comprises each described buck circuit as claim 1-7.
9. a LED light fixture is characterized in that, described LED light fixture comprises led drive circuit as claimed in claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010174682A CN101860202A (en) | 2010-05-12 | 2010-05-12 | Buck chopper circuit, LED drive circuit and LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010174682A CN101860202A (en) | 2010-05-12 | 2010-05-12 | Buck chopper circuit, LED drive circuit and LED lamp |
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| CN101860202A true CN101860202A (en) | 2010-10-13 |
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| CN201010174682A Pending CN101860202A (en) | 2010-05-12 | 2010-05-12 | Buck chopper circuit, LED drive circuit and LED lamp |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102065613A (en) * | 2010-12-22 | 2011-05-18 | 极创电子股份有限公司 | Drive circuit |
| CN102143639A (en) * | 2011-04-18 | 2011-08-03 | 鸿富锦精密工业（深圳）有限公司 | LED (Light Emitting Diode) driving circuit |
| CN102624226A (en) * | 2012-03-12 | 2012-08-01 | 苏州佳世达电通有限公司 | Boosting circuit and electronic device with same |
| CN104754793A (en) * | 2013-12-25 | 2015-07-01 | 深圳市海洋王照明工程有限公司 | Voltage-reduction constant-current LED (Light Emitting Diode) driving circuit, driving device and lighting system |
| CN105958607A (en) * | 2016-05-27 | 2016-09-21 | 陕西科技大学 | Charging device used for electrically driving coach car storage cell set |
| CN106605448A (en) * | 2014-08-27 | 2017-04-26 | 夏普株式会社 | Lighting device |
| CN109791596A (en) * | 2016-09-29 | 2019-05-21 | 日本电产三协株式会社 | The control method of card reader |
| CN111509949A (en) * | 2019-11-25 | 2020-08-07 | 深圳市海洋王照明工程有限公司 | Voltage reduction circuit and lamp |
| CN111614248A (en) * | 2020-06-15 | 2020-09-01 | 大峡谷照明系统（苏州）股份有限公司 | Direct current voltage reduction circuit and method and step type direct current voltage reduction circuit |
| CN112947664A (en) * | 2021-04-12 | 2021-06-11 | 上海物骐微电子有限公司 | Temperature self-adaptive voltage source |
| CN114222404A (en) * | 2021-12-21 | 2022-03-22 | 佛山市银河兰晶科技股份有限公司 | Lamp DMX address setting system and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6094038A (en) * | 1999-06-28 | 2000-07-25 | Semtech Corporation | Buck converter with inductive turn ratio optimization |
| CN1541440A (en) * | 2001-07-31 | 2004-10-27 | �ʼҷ����ֵ�������˾ | Tapped-inductor step-down converter |
| CN1674425A (en) * | 2004-03-26 | 2005-09-28 | 马维尔国际贸易有限公司 | Voltage regulator |
| CN1964587A (en) * | 2005-11-11 | 2007-05-16 | 崇贸科技股份有限公司 | A control system and device for switching type illuminant unit |
| US20080204126A1 (en) * | 2007-02-26 | 2008-08-28 | Shuo Wang | Common mode noise reduction using parasitic capacitance cancellation |
-
2010
- 2010-05-12 CN CN201010174682A patent/CN101860202A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6094038A (en) * | 1999-06-28 | 2000-07-25 | Semtech Corporation | Buck converter with inductive turn ratio optimization |
| CN1541440A (en) * | 2001-07-31 | 2004-10-27 | �ʼҷ����ֵ�������˾ | Tapped-inductor step-down converter |
| CN1674425A (en) * | 2004-03-26 | 2005-09-28 | 马维尔国际贸易有限公司 | Voltage regulator |
| CN1964587A (en) * | 2005-11-11 | 2007-05-16 | 崇贸科技股份有限公司 | A control system and device for switching type illuminant unit |
| US20080204126A1 (en) * | 2007-02-26 | 2008-08-28 | Shuo Wang | Common mode noise reduction using parasitic capacitance cancellation |
Non-Patent Citations (1)
| Title |
|---|
| 翁剑平: "新型大功率LED驱动芯片XLT604及其应用", 《电子元器件应用》 * |
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| CN102065613A (en) * | 2010-12-22 | 2011-05-18 | 极创电子股份有限公司 | Drive circuit |
| CN102143639A (en) * | 2011-04-18 | 2011-08-03 | 鸿富锦精密工业（深圳）有限公司 | LED (Light Emitting Diode) driving circuit |
| CN102624226A (en) * | 2012-03-12 | 2012-08-01 | 苏州佳世达电通有限公司 | Boosting circuit and electronic device with same |
| CN104754793A (en) * | 2013-12-25 | 2015-07-01 | 深圳市海洋王照明工程有限公司 | Voltage-reduction constant-current LED (Light Emitting Diode) driving circuit, driving device and lighting system |
| CN104754793B (en) * | 2013-12-25 | 2019-04-12 | 深圳市海洋王照明工程有限公司 | A kind of decompression constant current LED drive circuit, driving device and lighting system |
| CN106605448B (en) * | 2014-08-27 | 2019-03-12 | 夏普株式会社 | Lighting device |
| CN106605448A (en) * | 2014-08-27 | 2017-04-26 | 夏普株式会社 | Lighting device |
| CN105958607A (en) * | 2016-05-27 | 2016-09-21 | 陕西科技大学 | Charging device used for electrically driving coach car storage cell set |
| CN109791596A (en) * | 2016-09-29 | 2019-05-21 | 日本电产三协株式会社 | The control method of card reader |
| CN111509949A (en) * | 2019-11-25 | 2020-08-07 | 深圳市海洋王照明工程有限公司 | Voltage reduction circuit and lamp |
| CN111614248A (en) * | 2020-06-15 | 2020-09-01 | 大峡谷照明系统（苏州）股份有限公司 | Direct current voltage reduction circuit and method and step type direct current voltage reduction circuit |
| CN112947664A (en) * | 2021-04-12 | 2021-06-11 | 上海物骐微电子有限公司 | Temperature self-adaptive voltage source |
| CN114222404A (en) * | 2021-12-21 | 2022-03-22 | 佛山市银河兰晶科技股份有限公司 | Lamp DMX address setting system and method |
| CN114222404B (en) * | 2021-12-21 | 2022-07-26 | 佛山市银河兰晶科技股份有限公司 | Lamp DMX address setting system and method |
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Application publication date: 20101013 |