CN202340329U - Dimming LED (light-emitting diode) driving power supply control circuit under full-voltage input condition - Google Patents
Dimming LED (light-emitting diode) driving power supply control circuit under full-voltage input condition Download PDFInfo
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- CN202340329U CN202340329U CN2011203097585U CN201120309758U CN202340329U CN 202340329 U CN202340329 U CN 202340329U CN 2011203097585 U CN2011203097585 U CN 2011203097585U CN 201120309758 U CN201120309758 U CN 201120309758U CN 202340329 U CN202340329 U CN 202340329U
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Abstract
The utility model discloses a dimming LED (light-emitting diode) driving power supply control circuit under the full-voltage input condition. The circuit comprises a bridge rectifier, a first sampling unit, an input voltage control unit and a second sampling unit, wherein the bridge rectifier is used for converting input alternating current to direct current; the first sampling unit is used for partitioning the voltage of the input direct current; the input voltage control unit is used for inputting an obtained stable voltage to the second sampling unit according to the different input alternating current; and the second sampling unit is used for partitioning the stable voltage.
Description
Technical field
The utility model relates to a kind of LED driving circuit, relates in particular to the dimming LED (Light Emitting Diode) driving power control circuit under a kind of full voltage initial conditions.
Background technology
Light-emitting diode (LED) has that power consumption is little, long service life and advantage cheaply, by adaptable across each lighting field.Because the forward voltage-current characteristic of LED is very steep, dynamic electric resistor is less, make to use mains voltage source directly to supply power, otherwise when change appearred in voltage, especially when voltage increased, the electric current that flows through LED can sharply increase, and causes the LED load to be damaged.
Existing LED driving power utilizes line voltage usually after over commutation, filtering, utilizes pulse-width modulation (PWM) technology, feeds back to the PWM main control chip in conjunction with voltage sample or current sampling circuit, realizes the stable output of voltage or electric current.Because pulse modulation control is work under upper frequency, LED driving circuit can make the electromagnetic interference (EMI) problem more serious.When electric current and voltage are modulated by high-frequency oscillation signal, will produce electromagnetic noise (EMI), therefore utilize the EMI rectification circuit can effectively reduce electromagnetic noise.
Further developing in the process of LED driving power, set up dimmer.Wherein modal light adjusting controller is the phase truncation dimmer, is commonly called the TRIAC dimmer.
As shown in fig. 1, the LED driving power that has dimming function in the prior art generally includes with lower unit: AC input 10, dimmer 11, EMI rectification unit 12, voltage conversion unit 13 and LED bulb 14.For this LED equipment is further controlled, also comprise a feedback circuit 17 and control chip 16 usually.Dimming control signal from dimmer 11 is connected with chip 16 through an adjusting control circuit 15.
The defective of this adjusting control circuit is when input voltage changes in the prior art, and the voltage fluctuation meeting in the light modulation monitoring pin (IC Dim) of chip is excessive.The concrete structure sketch map of this adjusting control circuit 15, as shown in Figure 2.Alternating current AC converts direct current into after through a rectifier bridge.1 parallel connection and rectifier bridge BD1 of one capacitor C is used for filtering.Resistance R 1, R2 and R3 series connection, and an end of resistance R 1 is connected with filter capacitor C1 with rectifier bridge BD1, an end ground connection of resistance R 3 also is connected with filter capacitor C1.Direct current obtains a sampling voltage signal after R1, R2 and R3 dividing potential drop, after this sampling voltage signal process R4, the filtering of R5 dividing potential drop, offer the light modulation monitoring pin (IC Dim) of chip.Because the simple dividing potential drop that this sampling voltage signal only passes through resistance, so the voltage that the light modulation of chip monitoring pin (IC Dim) is located can receive the influence of the variation of input voltage AC variation.For example, if the resistance value of resistance R 1, R2 is 1M ohm, the resistance value of resistance R 3 is 1K ohm, and when input voltage AC was 110VAC, the voltage at A place was 8V among Fig. 3.When input voltage AC was 220VAC, the voltage at A place was 16V.This means when dimmer under same corner cut situation, input voltage AC can influence one times of the voltage phase difference that the light modulation monitoring pin (IC Dim) of chip locates, and causes LED time grade of brightness also can differ one times.If the dimming scope of the light modulation of chip monitoring pin (IC Dim) is 0.3～3V; Guaranteeing under the 110VAC initial conditions; When the dimming scope that satisfies the light modulation monitoring pin (IC Dim) of chip is 0.3～3V; Under the 220VAC initial conditions, the dimming scope of light modulation monitoring pin (IC Dim) that satisfies chip is just very little.Therefore the shortcoming of disclosed prior art is to adapt to the close limit input voltage among Fig. 2, near 110VAC, or near the 220VAC, and can not realize the light modulation that (comprises 110VAC and 220VAC) under the full voltage initial conditions.
Fig. 3 is an another kind of adjusting control circuit in the prior art.As shown in Figure 3, alternating current AC converts direct current into after through a rectifier bridge.1 parallel connection and rectifier bridge BD1 of one capacitor C is used for filtering.Direct current through a diode D1 after by R2 and R3 dividing potential drop.R2 and R3 series connection, and simultaneously parallelly connected with a filter capacitor C2.The shortcoming of the technical scheme among Fig. 3 is to adapt to the close limit input voltage, and when input voltage changed greatly, dimmer just can lose the light modulation effect, or the dimming scope change is very narrow.
Therefore, need the dimming LED (Light Emitting Diode) driving power control circuit of wanting under a kind of full voltage initial conditions in the prior art badly.
The utility model content
In order to overcome the defective that exists in the prior art, the utility model provides the control circuit of the dimming LED (Light Emitting Diode) driving power under a kind of full voltage initial conditions, and this control circuit can be operated in the interior brightness adjustment control that realizes of interval range of 110VAC and 220VAC.
In order to realize the foregoing invention purpose, the utility model discloses the dimming LED (Light Emitting Diode) driving power control circuit under a kind of full voltage initial conditions, comprising: a rectifier bridge is used for converting the alternating current of input into direct current; First sampling unit is used for the voltage dividing potential drop to the direct current of input; The input voltage control unit is used for obtaining burning voltage to the second sampling unit according to the alternating current of difference input; Second sampling unit is used for this burning voltage dividing potential drop.
Further; This first sampling unit comprises: first resistance, second resistance, the 3rd resistance and first electric capacity, the series connection of the one the second three resistance, the 3rd resistance other end ground connection; This first electric capacity, one end connects this first resistance, and the other end connects the 3rd resistance.
Further, this input voltage control unit comprises first triode, second triode, the 4th resistance and the 5th resistance, and an end of the 4th resistance is connected with the collector electrode of this first triode, and the other end connects a reference voltage; One end of the 5th resistance is connected with the collector electrode of this second triode, and the other end connects this reference voltage; The base stage of this first triode is connected with this first sampling unit, and the base stage of this second triode is connected with the collector electrode of this first triode; The equal ground connection of the emitter of this first, second triode.
Further, this second sampling unit comprises the 6th resistance, the 7th resistance and second electric capacity, the series connection of the 6th, the 7th resistance, and this second electric capacity is parallelly connected with the 7th resistance.
Further, this triode is metal-oxide-semiconductor or PNP pipe or NPN pipe.
The utility model discloses the dimming LED (Light Emitting Diode) driving power under a kind of full voltage initial conditions simultaneously, comprising: a dimmer, an EMI rectification unit; One voltage conversion unit; One feedback unit, a control unit and a dim signal control unit, this dim signal control unit is stable in order to realize the input signal under the full voltage initial conditions; Comprise: a rectifier bridge is used for converting the alternating current of input into direct current; First sampling unit is used for the voltage dividing potential drop to the direct current of input; The input voltage control unit is used for obtaining burning voltage to the second sampling unit according to the alternating current of difference input; Second sampling unit is used for delivering to this control unit to after this burning voltage dividing potential drop.
Further; This first sampling unit comprises: first resistance, second resistance, the 3rd resistance and first electric capacity, the series connection of the one the second three resistance, the 3rd resistance other end ground connection; This first electric capacity, one end connects this first resistance, and the other end connects the 3rd resistance.
Further, this input voltage control unit comprises first triode, second triode, the 4th resistance and the 5th resistance, and an end of the 4th resistance is connected with the collector electrode of this first triode, and the other end connects a reference voltage; One end of the 5th resistance is connected with the collector electrode of this second triode, and the other end connects this reference voltage; The base stage of this first triode is connected with this first sampling unit, and the base stage of this second triode is connected with the collector electrode of this first triode; The equal ground connection of the emitter of this first, second triode.
Further; This second sampling unit comprises the 6th resistance, the 7th resistance and second electric capacity, the series connection of the 6th, the 7th resistance, and this second electric capacity is parallelly connected with the 7th resistance; One end of the 6th resistance connects this input voltage control unit, and the other end connects control unit.
Further, this triode is metal-oxide-semiconductor or PNP pipe or NPN pipe.
Compared with prior art; Input voltage in dimming LED (Light Emitting Diode) driving power control circuit under a kind of full voltage initial conditions that the utility model provided can adapt to from 110VAC to the 220VAC scope; When input voltage changes greatly, can not influence the dimming scope of this dimmer.And this technical scheme can be used in different mains voltage source, and not needing increases extra circuit because mains voltage source changes, and English is female can to reduce production costs.
Description of drawings
Can graphicly further be understood through following detailed Description Of The Invention and appended about advantage of the present invention and spirit.
Fig. 1 is the structured flowchart of the LED driving power of prior art;
Fig. 2 is the concrete structure sketch map of one of adjusting control circuit of the LED driving power of prior art;
Fig. 3 is two the concrete structure sketch map of adjusting control circuit of the LED driving power of prior art;
Fig. 4 is the adjusting control circuit concrete structure sketch map of the LED driving power under the shown full voltage initial conditions of the utility model;
Fig. 5 is the test design sketch of the adjusting control circuit of the LED driving power under the full voltage initial conditions.
Embodiment
Specify specific embodiment of the present invention below in conjunction with accompanying drawing.
As shown in Figure 4, the dimming LED (Light Emitting Diode) driving power control circuit under this full voltage initial conditions comprises: a rectifier bridge is used for converting the alternating current of input into direct current; First sampling unit is used for the voltage dividing potential drop to the direct current of input; The input voltage control unit is used for obtaining burning voltage to the second sampling unit according to the alternating current of difference input; Second sampling unit is used for this burning voltage dividing potential drop.
This first sampling unit comprises: resistance 53, resistance 54, resistance 55 and electric capacity 52, resistance 53, resistance 54, resistance 55 series connection.One end of resistance 55 is connected other end ground connection with resistance 54.Electric capacity 52 1 ends connect this resistance 53, and the other end connects this resistance 55.
The input voltage control unit comprises triode 57, triode 58, resistance 56 and resistance 59, and an end of this resistance 56 is connected with the collector electrode of this triode 57, and the other end connects a reference voltage Verf.This reference voltage is a burning voltage in this execution mode, is 5V like magnitude of voltage.One end of resistance 59 is connected with the collector electrode of triode 58, and the other end connects this reference voltage Verf.The base stage of this triode 57 is connected with this first sampling unit.The base stage of triode 58 is connected with the collector electrode of triode 57.The equal ground connection of the emitter of triode 57, triode 58.Triode 57, triode 58 are metal-oxide-semiconductor or PNP pipe or NPN pipe.
Second sampling unit comprises resistance 60, resistance 63 and electric capacity 62, resistance 60, resistance 63 series connection, and this electric capacity 62 is parallelly connected with resistance 63.
Rectifier bridge BD1 with AC power AC DC power supply after through after a filter capacitor 52 filtering, the direct voltage of resistance 53, resistance 54,55 pairs of inputs of the resistance dividing potential drop of sampling.Because this resistance 54, resistance 55 link to each other with the base stage of triode 57, therefore when the A place among Fig. 4 is high level, triode 57 conductings, electric current is from reference voltage Vref flow through resistance 56 and the generation of the B place in Fig. 4 one high level.Same, when the B place produces a high level, triode 58 conductings, the voltage of the C among Fig. 4 is the voltage of resistance 59, resistance 60 and resistance 63 dividing potential drops.Therefore; The voltage at C place does not receive the influence of V1 place voltage height; And only got the duty ratio after the dimmer corner cut, through resistance 60 and resistance 63 reasonable dividing potential drops just can realize that pin (IC Dim) is monitored in the light modulation of chip thus pressure only with the light modulation under the voltage realization full voltage initial conditions of dimmer duty ratio.
Dimming LED (Light Emitting Diode) driving power control circuit under the full voltage initial conditions that the utility model provided dimmer after after the corner cut duty ratio of voltage through triode 57, triode 58 adjustment; Obtain one relatively stable; The DC level that not influenced by input voltage; Thereby eliminate the influence of input voltage, guarantee to accomplish comparatively stable dimming under the situation of input voltage variation.
In this execution mode, triode 57, triode 58 are positioned in this LED driving power control circuit, in another embodiment, can with triode 57, triode 58 built-in with chip among, simplify the periphery design of whole LED driving power.
Fig. 5 is the test design sketch of the adjusting control circuit of the LED driving power under the full voltage initial conditions.
As shown in Figure 5, when curve LB pressed to 110V among the figure, when the dimmer corner cut changed, the change curve of output current size was that brightness changes.Curve LR goes into voltage when being 220V, output current change curve in dimmer corner cut change procedure, i.e. and brightness changes.As can be seen from Figure 5 under two kinds of voltage condition, can both realize even light modulation with the LED lamp of a power drives.
Described in this specification is preferred embodiment of the present invention, and above embodiment is only in order to explain technical scheme of the present invention but not limitation of the present invention.All those skilled in the art all should be within scope of the present invention under this invention's idea through the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. the dimming LED (Light Emitting Diode) driving power control circuit under the full voltage initial conditions is characterized in that, comprising:
One rectifier bridge is used for converting the alternating current of input into direct current;
First sampling unit is used for the voltage dividing potential drop to the direct current of input;
The input voltage control unit is used for obtaining burning voltage to the second sampling unit according to the alternating current of difference input;
Second sampling unit is used for said burning voltage dividing potential drop.
2. dimming LED (Light Emitting Diode) driving power control circuit as claimed in claim 1 is characterized in that, said first sampling unit comprises:
First resistance, second resistance, the 3rd resistance and first electric capacity, said the one the second three resistance series connection, said the 3rd resistance other end ground connection, said first electric capacity, one end connects said first resistance, and the other end connects said the 3rd resistance.
3. dimming LED (Light Emitting Diode) driving power control circuit as claimed in claim 1; It is characterized in that; Said input voltage control unit comprises first triode, second triode, the 4th resistance and the 5th resistance; One end of said the 4th resistance is connected with the collector electrode of said first triode, and the other end connects a reference voltage; One end of said the 5th resistance is connected with the collector electrode of said second triode, and the other end connects said reference voltage; The base stage of said first triode is connected with said first sampling unit, and the base stage of said second triode is connected with the collector electrode of said first triode; The equal ground connection of the emitter of said first, second triode.
4. dimming LED (Light Emitting Diode) driving power control circuit as claimed in claim 1 is characterized in that said second sampling unit comprises the 6th resistance, the 7th resistance and second electric capacity, said the 6th, the 7th resistance series connection, and said second electric capacity is parallelly connected with said the 7th resistance.
5. dimming LED (Light Emitting Diode) driving power control circuit as claimed in claim 3 is characterized in that, said triode is metal-oxide-semiconductor or PNP pipe or NPN pipe.
6. the dimming LED (Light Emitting Diode) driving power under the full voltage initial conditions is characterized in that, comprising: a dimmer; One EMI rectification unit; One voltage conversion unit, a feedback unit, a control unit and a dim signal control unit; Said dim signal control unit is stable in order to realize the input signal under the full voltage initial conditions, comprising:
One rectifier bridge is used for converting the alternating current of input into direct current;
First sampling unit is used for the voltage dividing potential drop to the direct current of input;
The input voltage control unit is used for obtaining burning voltage to the second sampling unit according to the alternating current of difference input;
Second sampling unit is used for delivering to said control unit after the said burning voltage dividing potential drop.
7. dimming LED (Light Emitting Diode) driving power as claimed in claim 6; It is characterized in that; Said first sampling unit comprises: first resistance, second resistance, the 3rd resistance and first electric capacity, said the one the second three resistance series connection, said the 3rd resistance other end ground connection; Said first electric capacity, one end connects said first resistance, and the other end connects said the 3rd resistance.
8. dimming LED (Light Emitting Diode) driving power as claimed in claim 6; It is characterized in that; Said input voltage control unit comprises first triode, second triode, the 4th resistance and the 5th resistance; One end of said the 4th resistance is connected with the collector electrode of said first triode, and the other end connects a reference voltage; One end of said the 5th resistance is connected with the collector electrode of said second triode, and the other end connects said reference voltage; The base stage of said first triode is connected with said first sampling unit, and the base stage of said second triode is connected with the collector electrode of said first triode; The equal ground connection of the emitter of said first, second triode.
9. dimming LED (Light Emitting Diode) driving power as claimed in claim 6; It is characterized in that; Said second sampling unit comprises the 6th resistance, the 7th resistance and second electric capacity, said the 6th, the 7th resistance series connection, and said second electric capacity is parallelly connected with said the 7th resistance; One end of said the 6th resistance connects said input voltage control unit, and the other end connects control unit.
10. dimming LED (Light Emitting Diode) driving power as claimed in claim 8 is characterized in that, said triode is metal-oxide-semiconductor or PNP pipe or NPN pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203097585U CN202340329U (en) | 2011-08-24 | 2011-08-24 | Dimming LED (light-emitting diode) driving power supply control circuit under full-voltage input condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203097585U CN202340329U (en) | 2011-08-24 | 2011-08-24 | Dimming LED (light-emitting diode) driving power supply control circuit under full-voltage input condition |
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| CN202340329U true CN202340329U (en) | 2012-07-18 |
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| CN2011203097585U Expired - Lifetime CN202340329U (en) | 2011-08-24 | 2011-08-24 | Dimming LED (light-emitting diode) driving power supply control circuit under full-voltage input condition |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104470060A (en) * | 2014-10-20 | 2015-03-25 | 深圳市华星光电技术有限公司 | Analog dimming conversion circuit and display device |
| CN105509579A (en) * | 2015-11-30 | 2016-04-20 | 无锡力芯微电子股份有限公司 | Charging protection circuit of electronic detonator |
| US9408260B2 (en) | 2014-10-20 | 2016-08-02 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Analog dimming conversion circuit and display device |
| CN108448889A (en) * | 2018-03-13 | 2018-08-24 | 深圳市聚炫光电照明有限公司 | A kind of LED power and method with control module |
-
2011
- 2011-08-24 CN CN2011203097585U patent/CN202340329U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104470060A (en) * | 2014-10-20 | 2015-03-25 | 深圳市华星光电技术有限公司 | Analog dimming conversion circuit and display device |
| WO2016061845A1 (en) * | 2014-10-20 | 2016-04-28 | 深圳市华星光电技术有限公司 | Analog dimming conversion circuit and display device |
| US9408260B2 (en) | 2014-10-20 | 2016-08-02 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Analog dimming conversion circuit and display device |
| GB2547356A (en) * | 2014-10-20 | 2017-08-16 | Shenzhen China Star Optoelect | Analog dimming conversion circuit and display device |
| GB2547356B (en) * | 2014-10-20 | 2021-01-13 | Shenzhen China Star Optoelect | Analog dimming conversion circuit and display device |
| CN105509579A (en) * | 2015-11-30 | 2016-04-20 | 无锡力芯微电子股份有限公司 | Charging protection circuit of electronic detonator |
| CN105509579B (en) * | 2015-11-30 | 2017-06-23 | 无锡力芯微电子股份有限公司 | A kind of electric detonator charge protector |
| CN108448889A (en) * | 2018-03-13 | 2018-08-24 | 深圳市聚炫光电照明有限公司 | A kind of LED power and method with control module |
| CN108448889B (en) * | 2018-03-13 | 2019-09-06 | 深圳市聚炫光电照明有限公司 | A kind of LED power and method with control module |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210224 Address after: No. 1600, Zixing Road, Minhang District, Shanghai 200241 Patentee after: BCD (SHANGHAI) MICRO-ELECTRONICS Ltd. Address before: 200241 no.800, Yishan Road, Xuhui District, Shanghai Patentee before: BCD Semiconductor Manufacturing Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120718 |