CN105282905A - Dimming circuit and LED power supply device comprising same - Google Patents
Dimming circuit and LED power supply device comprising same Download PDFInfo
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- CN105282905A CN105282905A CN201410298967.2A CN201410298967A CN105282905A CN 105282905 A CN105282905 A CN 105282905A CN 201410298967 A CN201410298967 A CN 201410298967A CN 105282905 A CN105282905 A CN 105282905A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention relates to a dimming circuit and an LED power supply device comprising the same. The dimming circuit particularly comprises a low-level prevention unit, wherein an electrical end of the low-level prevention unit is coupled to a control dimming unit of the dimming circuit, another electrical end thereof is coupled to a constant current source inside the dimming circuit. Therefore, when a user adopts more than two power conversion units respectively connected to more than two LED light emitting devices and adjusts light emitting brightness of the LED light emitting devices by using the single control dimming unit, the low-level prevention unit can prevent signal level of a dimming signal output by the control dimming unit from being pulled down to a low level when encountering the condition that one of the power conversion units is damaged or short-circuited, and further maintain the normal operation of the other power conversion unit and the matched dimming circuit.
Description
Technical field
The present invention about a kind of LED lamp light adjusting circuit, refer to especially possess simple circuit structure, low cost a kind of light adjusting circuit and there is the LED power feeding mechanism of this light adjusting circuit.
Background technology
In recent years, light-emitting diode (Light-EmittingDiode, LED) is applied on the lighting device of daily life widely; But, along with the fast development in the market of LED light device, people for the production reliability of LED light device, the continuous requirement of useful life and environmental protection and energy saving aspect, particularly for the dimming function of LED light device.In addition, people are not only the object that can reach energy saving for the requirement of the dimming function of LED light device, be more how to utilize the adjustment brightness of LED light device, colour temperature obtains better quality of life.
In view of this, the various LED power supply possessing dimming function is proposed on the market.Refer to Fig. 1, existing a kind of circuit framework figure possessing the LED power supply of dimming function.As shown in Figure 1, the existing LED power supply 1 ' possessing dimming function comprising: one first power conversion unit 11 ', one first driver element 12 ' and one first switch element 15 ', wherein, one of one first LED light emission device 2 ' electrically holds the output being coupled to this first power conversion unit 11 ', and this first switch element 15 ' is coupled between another electrical end with output of this first power conversion unit 11 ' of this first LED light emission device 2 '.
Hold above-mentioned explanation, user sends a dim signal to this first driver element 12 ' by operating the mode of a dim signal generator 16 ', then this first driver element 12 ' exports a drive singal to control the on off state (ON/OFFstate) of this first switch element 15 ' according to this dim signal, and mode reaches the object of the luminosity of this first LED light emission device 2 ' of adjustment by this.
In addition, as shown in Figure 1, user can utilize the LED power supply 1a ' including a second source converting unit 11a ', one second driver element 12a ' and a second switch unit 15a ' to drive a LED light emission device 2a ' luminous simultaneously; Further, user, by operating the mode of single dim signal generator 16 ', reaches the object of the luminosity of this two groups of LED light emission device simultaneously (2 ', 2a ').
The LED power supply of what Fig. 1 illustrated possess dimming function, because its body frame structure is very simple, is therefore widely used among LED light device or LED lamp, but, the inventor of this case finds that the LED power supply that this possesses dimming function has following major defect after deliberation afterwards: due to this two LED power supply (1 ', 1a ') be coupled to same dim signal generator 16 ' simultaneously, therefore, once the situation that wherein one group of LED power supply 1 ' (or LED power supply 1a ') is damaged or is short-circuited, certainly will be inconjunction with and the signal level of the dim signal inputing to another group LED power supply 1a ' (or LED power supply 1 ') is pulled down to low level, and make this second driver element 12a ' (or this first driver element 12 ') cannot continue to export this output dim signal, finally, the damage of this LED power supply 1 ' (or LED power supply 1a ') will cause that another group LED power supply 1a ' (or LED power supply 1 ') cannot normally LED light emission device 2a ' (or first LED light emission device 2 ') be luminous.
Therefore, because the existing LED power supply of institute and light adjusting circuit thereof still have shortcoming with not enough at present, the inventor of this case does one's utmost to be studied invention, has has finally researched and developed a kind of light adjusting circuit of the present invention and has had the LED power feeding mechanism of this light adjusting circuit.
Summary of the invention
Main purpose of the present invention, be the LED power feeding mechanism a kind of light adjusting circuit being provided and there is this light adjusting circuit, wherein this light adjusting circuit has a low level prevention unit especially, and one of this low level prevention unit electrically holds the control dimming unit being coupled to light adjusting circuit, its another electrical end then couples the constant current source of light adjusting circuit inside; So, once user is connected to plural LED light emission device with plural power conversion unit and respectively with single control dimming unit to when the luminosity adjusting those LED light emission device, this low level prevention unit just can in wherein one group of power conversion unit damage or be short-circuited situation time, the signal level of the dim signal stoping this control dimming unit to export is pulled downwardly to low level, and then maintains the normal operation of the light adjusting circuit that another group power conversion unit is mated.
In order to reach object of the present invention, the present invention proposes a kind of light adjusting circuit, comprising:
One constant current source, in order to produce certain electric current;
One controls dimming unit, is coupled to this constant current source, and exports a dim signal after this determines electric current in reception;
One filter unit, is coupled to this control dimming unit to receive this dim signal, and carries out filtering to this dim signal;
One light turns off and driver element, is coupled to this filter unit to receive through this dim signal filtered, and then exports a drive control signal;
One switch element, be coupled to this light to turn off and driver element, an external power source converting unit and an external LED light-emitting device, wherein, this light turns off and drives with this drive control signal with driver element and control this switch element, to make this external LED light-emitting device luminous; And
One low level prevention unit, one is electrically held and is coupled to this control dimming unit, and its another electrical end couples this constant current source and this filter unit; Wherein, this low level prevention unit is pulled downwardly to low level in order to stop the signal level of this dim signal.
Light adjusting circuit as above, wherein, this constant current source comprises:
One bipolar junction transistors, is coupled to this low level prevention unit and this filter unit with its collector terminal;
One emitter resistance, its one end is coupled to the emitter-base bandgap grading end of this bipolar junction transistors, and its other end is coupled to an operating voltage;
One base resistance, its one end is coupled to the base terminal of this bipolar junction transistors, and other end ground connection; And
Two diodes be one another in series, are coupled between this emitter resistance and this base resistance, and couple this operating voltage simultaneously.
Light adjusting circuit as above, wherein, this control dimming unit is variable resistor dimmer, direct current dimmer, pulse-width modulation signal dimmer or above-mentioned both above combinations.
Light adjusting circuit as above, wherein, this filter unit comprises:
One filter resistance, its one end is coupled to this constant current source and this low level prevention unit, and its other end is then coupled to this light and turns off and driver element; And
One filter capacitor, its one end is coupled to the other end of this filter resistance and this light turns off and driver element, its other end then ground connection.
Light adjusting circuit as above, wherein, this light turn off with driver element be a comparator, and this comparator have be coupled to a reference voltage a first input end, be coupled to one second input of this filter unit and be coupled to an output of this switch element.
Light adjusting circuit as above, wherein, this switch element is a power-type metal-oxide half field effect transistor.
Light adjusting circuit as above, wherein, this low level prevention unit is a diode.
Light adjusting circuit as above, wherein, described power conversion unit is flyback power conversion unit, forward type power conversion unit, LLC resonant mode power supply changeover device or push-pull type power conversion unit.
Light adjusting circuit as above, wherein, this low level prevention unit is a metal-oxide half field effect transistor, and this metal-oxide half field effect transistor has a body diode; Wherein, the drain end of this metal-oxide half field effect transistor is coupled to this constant current source and this filter unit, the source terminal of this metal-oxide half field effect transistor is coupled to this control dimming unit, and the gate terminal of this metal-oxide half field effect transistor is coupled to this output of this comparator.
There is a LED power feeding mechanism for light adjusting circuit, comprising:
At least one power conversion unit, couples an AC power and carries out voltage transitions with the alternating current exported this AC power, and then output one stabilized power supply gives at least one LED light emission device; And
One light adjusting circuit, comprising:
One constant current source, in order to produce certain electric current;
One controls dimming unit, is coupled to this constant current source, and exports a dim signal after this determines electric current in reception;
One filter unit, is coupled to this control dimming unit to receive this dim signal, and carries out filtering to this dim signal;
One light turns off and driver element, is coupled to this filter unit to receive through this dim signal filtered, and then exports a drive control signal;
One switch element, is coupled to this light and turns off and driver element, this power conversion unit and this LED light emission device, and wherein, this light turns off and drives with this drive control signal with driver element and control this switch element, to make this LED light emission device luminous; And
One low level prevention unit, one is electrically held and is coupled to this control dimming unit, and its another electrical end couples this constant current source and this filter unit; Wherein, this low level prevention unit is pulled downwardly to low level in order to stop the signal level of this dim signal.
Have the LED power feeding mechanism of light adjusting circuit as above, wherein, this constant current source comprises:
One bipolar junction transistors, is coupled to this low level prevention unit and this filter unit with its collector terminal;
One emitter resistance, its one end is coupled to the emitter-base bandgap grading end of this bipolar junction transistors, and its other end is coupled to an operating voltage;
One base resistance, its one end is coupled to the base terminal of this bipolar junction transistors, and other end ground connection; And
Two diodes be one another in series, are coupled between this emitter resistance and this base resistance, and couple this operating voltage simultaneously.
Have the LED power feeding mechanism of light adjusting circuit as above, wherein, this control dimming unit is variable resistor dimmer, direct current dimmer, pulse-width modulation signal dimmer or above-mentioned both above combinations.
Have the LED power feeding mechanism of light adjusting circuit as above, wherein, this filter unit comprises:
One filter resistance, its one end is coupled to this constant current source and this low level prevention unit, and its other end is then coupled to this light and turns off and driver element; And
One filter capacitor, its one end is coupled to the other end of this filter resistance and this light turns off and driver element, its other end then ground connection.
There is the LED power feeding mechanism of light adjusting circuit as above, wherein, this light turn off with driver element be a comparator, and this comparator have be coupled to a reference voltage a first input end, be coupled to one second input of this filter unit and be coupled to an output of this switch element.
Have the LED power feeding mechanism of light adjusting circuit as above, wherein, this switch element is a power-type metal-oxide half field effect transistor.
Have the LED power feeding mechanism of light adjusting circuit as above, wherein, this low level prevention unit is a diode.
Have the LED power feeding mechanism of light adjusting circuit as above, wherein, described power conversion unit is flyback power conversion unit, forward type power conversion unit, LLC resonant mode power supply changeover device or push-pull type power conversion unit.
Have the LED power feeding mechanism of light adjusting circuit as above, wherein, this low level prevention unit is a metal-oxide half field effect transistor, and this metal-oxide half field effect transistor has a body diode; Wherein, the drain end of this metal-oxide half field effect transistor is coupled to this constant current source and this filter unit, the source terminal of this metal-oxide half field effect transistor is coupled to this control dimming unit, and the gate terminal of this metal-oxide half field effect transistor is coupled to this output of this comparator.
Compared with prior art, beneficial effect of the present invention is:
Light adjusting circuit of the present invention has a low level prevention unit especially, and one of this low level prevention unit electrically holds the control dimming unit being coupled to light adjusting circuit, and its another electrical end then couples the constant current source of light adjusting circuit inside; So, once user is connected to plural LED light emission device with plural power conversion unit and respectively with single control dimming unit to when the luminosity adjusting those LED light emission device, this low level prevention unit just can in wherein one group of power conversion unit damage or be short-circuited situation time, the signal level of the dim signal stoping this control dimming unit to export is pulled downwardly to low level, and then maintains the normal operation of the light adjusting circuit that another group power conversion unit is mated.
Must in addition it is emphasised that, above-mentioned detailed description illustrates for possible embodiments of the present invention, only this embodiment and be not used to limit the scope of the claims of the present invention, all do not depart from skill spirit of the present invention do equivalence implement or change, all should be contained in this case the scope of the claims.
Accompanying drawing explanation
Fig. 1 is existing a kind of circuit block diagram possessing the LED power supply of dimming function;
Fig. 2 is a kind of circuit block diagram with the LED power feeding mechanism of light adjusting circuit of the present invention;
Fig. 3 A is the first circuit framework figure of the LED power feeding mechanism with light adjusting circuit;
Fig. 3 B is the second circuit Organization Chart of the LED power feeding mechanism with light adjusting circuit; And
Fig. 4 is the application circuit calcspar of the LED power feeding mechanism with light adjusting circuit.
In figure, primary symbols illustrates:
< > of the present invention
1: light adjusting circuit 2: power conversion unit
Vac: AC power 3:LED light-emitting device
11: constant current source 12: control dimming unit
13: filter unit 14: light turns off and driver element
17: switch element 18: low level prevention unit
Icon: determine electric current Va: analog voltage signal
VPWMPWM: voltage signal Q: bipolar junction transistors
RE: emitter resistance Vdd: operating voltage
VREF: reference voltage RB: base resistance
D1: diode D2: diode
R1: filter resistance R2: filter capacitor
The known > of <
1 ': LED power supply 2: the first LED light emission device
11 ': the first power conversion unit 12 ': the first driver element
13 ': the first signal processing unit
14 ': the first switch element driver element
15 ': the first switch element
16 ': dim signal generator 1a ': LED power supply
2a ': LED light emission device 11a ': second source converting unit
12a ': the second driver element 13a ': secondary signal processing unit
14a ': second switch element drives unit
15a ' second switch unit
Embodiment
In order to a kind of light adjusting circuit proposed by the invention more clearly can be described and there is the LED power feeding mechanism of this light adjusting circuit, below will coordinate graphic, elaborate preferred embodiment of the present invention.
Refer to Fig. 2, a kind of circuit block diagram with the LED power feeding mechanism of light adjusting circuit of the present invention; Further, please refer to Fig. 3 A, this has the first circuit framework figure of the LED power feeding mechanism of light adjusting circuit.As shown in Fig. 2 and Fig. 3 A, the LED power feeding mechanism with light adjusting circuit of the present invention mainly comprises: light adjusting circuit 1 and a power conversion unit 2, wherein, this power conversion unit 2 couples an AC power Vac and carries out voltage transitions with the alternating current exported this AC power Vac, and then output one stabilized power supply gives at least one LED light emission device 3.This power conversion unit 2 can be flyback (flyback) power conversion unit, forward type (forward) power conversion unit, LLC resonant mode power supply changeover device or push-pull type (push-pull) power conversion unit.Separately, this light adjusting circuit 1 is coupled between this power conversion unit 2 and this LED light emission device 3, in order to adjust the luminosity of this LED light emission device 3.
Consult Fig. 2 and Fig. 3 A unceasingly, this light adjusting circuit 1 comprises: a constant current source 11, controls dimming unit 12, filter unit 13, light and turns off and driver element 14 and a low level prevention unit 18, wherein this constant current source 11 is in order to produce certain electric current I con, and this control dimming unit 12 is coupled to this constant current source 11, and export a dim signal (dimmingsignal) after this determines electric current in reception.Further, this filter unit 13 is coupled to and controls dimming unit 12 to receive this dim signal, and carries out filtering to this dim signal; Further, the light being coupled to this filter unit 13 turns off and in receiving after this dim signal filtered, can export a drive control signal with driver element 14.
Hold above-mentioned explanation, this switch element 17 is coupled to this light and turns off and driver element 14, power conversion unit 2 and a LED light emission device 3, wherein, this light turns off and drives with this drive control signal with driver element 14 and control this switch element 17, to make this LED light emission device 3 luminous.Especially, the present invention also has a low level prevention unit 18; As shown in Fig. 2 and Fig. 3 A, this low level prevention unit 18 is a diode, and one elecrtonegativity end (that is, N is extreme) is coupled to this control dimming unit 12, and one electropositive end (that is, P is extreme) couples this constant current source 11 and this filter unit 13; Wherein, this low level prevention unit 18 is in order to maintain the signal level of this dim signal.In order to explain the function of low level prevention unit 18 of the present invention further, must be transmitted through the application circuit calcspar with the LED power feeding mechanism of light adjusting circuit that Fig. 4 illustrates and clearly demonstrating.In the application of general LED power feeding mechanism, usually the power conversion unit 2 among LED power feeding mechanism can be connected to LED light emission device 3; Be connected to two LED light emission device 3 respectively with two power conversion units 2 as shown in Figure 4, and adjust the luminosity of these two LED light emission device 3 with single control dimming unit 12.
Hold above-mentioned explanation, but, once the situation that wherein one group of power conversion unit 2 is damaged or is short-circuited, certainly will be inconjunction with and the signal level of the dim signal inputing to another group power conversion unit 2 is pulled down to low level; Now, low level prevention unit 18 (namely, diode) just can play its function and be pulled downwardly to low level to stop the signal level of dim signal, and then maintain the normal operation of the light adjusting circuit 1 (comprising this control dimming unit 12) that another group power conversion unit 2 is mated.When wherein one group of power conversion unit 2 damage or be short-circuited situation time, what constant current source 11 exported determine, and electric current I con just only can input this group normal by this diode control dimming unit 12, the electric connection that mode keeps this group normal to control dimming unit 12 and constant current source 11 is by this closed, and is to be pulled downwardly to low level with the signal level that this group normal can be avoided to control the dim signal that dimming unit 12 exports.
Please continue to refer to Fig. 3 B, there is the second circuit Organization Chart of the LED power feeding mechanism of light adjusting circuit.In the present invention, except the enforcement aspect of this low level prevention unit 18 gone out except Fig. 3 A, low level prevention unit 18 can Fig. 3 B be also a metal-oxide half field effect transistor (PowerMetal-Oxide-SemiconductorField-EffectTransistor, and this metal-oxide half field effect transistor has a body diode (Bodydiode) PowerMOSFET); Wherein, the drain end of this metal-oxide half field effect transistor is coupled to this constant current source 11 and this filter unit 13, the source terminal of this metal-oxide half field effect transistor is coupled to this control dimming unit 12, and the gate terminal of this metal-oxide half field effect transistor is coupled to the output of light shutoff and driver element 14.Setting like this, when wherein one group of power conversion unit 2 damage or be short-circuited situation time, the body diode inner due to low level prevention unit 18 (metal-oxide half field effect transistor) just can play its function, reach and stop the signal level of dim signal to be pulled downwardly effect to low level, and then maintain the normal operation of the light adjusting circuit 1 (comprising this control dimming unit 12) that another group power conversion unit 2 is mated.Further, when circuit runs well, low level prevention unit 18 (metal-oxide half field effect transistor) is a conducting circuit, and it causes any pressure drop hardly.
In addition, because the present invention is not particularly limited the form of this control dimming unit 12, therefore this control dimming unit 12 can be variable resistor dimmer, direct current light modulator, pulse-width modulation signal dimmer and above-mentioned both above combinations.As shown in Figure 3A, in application can direct current light modulator or pulse-width modulation signal dimmer as this control dimming unit 12; Wherein, if using direct current light modulator as control dimming unit 12, then control an analog voltage signal Va that dimming unit 12 (can be generally 1V ~ 10V) by low level prevention unit 18 input voltage value between 0V and 10V to back-end circuit.Separately, if using pulse-width modulation signal dimmer as control dimming unit 12, then controlling dimming unit 12 can by the pwm signal VPWM of low level prevention unit 18 input voltage value between 12V and 24V to back-end circuit.In addition, as shown in Figure 3 B, also can using variable resistor dimmer as this control dimming unit 12 in application, wherein, constant current source 11 inputs to variable-resistance this and determines electric current I con can cause 0V ~ 10V voltage in these variable-resistance two ends, and this voltage is just as the input voltage in order to input to back-end circuit.
To this, must to turn off the constant current source 11 of this light adjusting circuit 1, filter unit 13 and light and the enforcement aspect of driver element 14 is further described.As shown in Figure 3A, in the present invention, this constant current source 11 is by a bipolar junction transistors (BipolarJunctionTransistor, BJT) diode (D1 that is one another in series of Q, an emitter resistance RE, a base resistance RB and two, D2) formed, wherein, this bipolar junction transistors Q is coupled to this low level prevention unit 18 and this filter unit 13 with its collector terminal.One end of this emitter resistance RE is coupled to the emitter-base bandgap grading end of this bipolar junction transistors Q, and its other end is coupled to an operating voltage Vdd.Separately, one end of this base resistance RB is coupled to the base terminal of this bipolar junction transistors Q, and other end ground connection.Moreover these two diodes (D1, D2) be one another in series are coupled between this emitter resistance RE and this base resistance RB, and couple this operating voltage Vdd simultaneously.
Continue above-mentioned explanation, this filter unit 13 is made up of a filter resistance R1 and a filter capacitor C1, wherein, one end of this filter resistance R1 is coupled to this constant current source 11 and this low level prevention unit 18, and its other end is then coupled to this light and turns off and driver element 14; Further, one end of filter capacitor C1 is coupled to the other end of this filter resistance R1 and this light turns off and driver element 14, and its other end ground connection.Separately, this light turn off with driver element 14 be a comparator, and this comparator have be coupled to a reference voltage VREF a first input end, be coupled to one second input of this filter unit 13 and be coupled to an output of this switch element 17.In light shutoff and the circuit of driver element 14 operate, when the magnitude of voltage controlling the dim signal that dimming unit 12 inputs is too low, such as: be less than 2V, then after the dim signal of comparator through comparing 2V and this reference voltage VREF, just can assert that user performs the action of closing LED power, drive with control signal to close this switch element 17 so comparator just can export, mode stops the luminescence of this LED light emission device 3 by this.On the contrary, when the magnitude of voltage of the dim signal that control dimming unit 12 inputs is higher than 2V, then light turns off and just exports a high levle signal to open (Turnon) this switch element 17 with driver element 14, and mode makes the luminescence of this LED light emission device 3 by this.
Above embodiment is only exemplary embodiment of the present invention, and be not used in restriction the present invention, protection scope of the present invention is defined by the claims.Those skilled in the art can in essence of the present invention and protection range, and make various amendment or equivalent replacement to the present invention, this amendment or equivalent replacement also should be considered as dropping in protection scope of the present invention.
Claims (18)
1. a light adjusting circuit, is characterized in that, comprising:
One constant current source, in order to produce certain electric current;
One controls dimming unit, is coupled to this constant current source, and exports a dim signal after this determines electric current in reception;
One filter unit, is coupled to this control dimming unit to receive this dim signal, and carries out filtering to this dim signal;
One light turns off and driver element, is coupled to this filter unit to receive through this dim signal filtered, and then exports a drive control signal;
One switch element, be coupled to this light to turn off and driver element, an external power source converting unit and an external LED light-emitting device, wherein, this light turns off and drives with this drive control signal with driver element and control this switch element, to make this external LED light-emitting device luminous; And
One low level prevention unit, one is electrically held and is coupled to this control dimming unit, and its another electrical end couples this constant current source and this filter unit; Wherein, this low level prevention unit is pulled downwardly to low level in order to stop the signal level of this dim signal.
2. light adjusting circuit according to claim 1, is characterized in that, wherein, this constant current source comprises:
One bipolar junction transistors, is coupled to this low level prevention unit and this filter unit with its collector terminal;
One emitter resistance, its one end is coupled to the emitter-base bandgap grading end of this bipolar junction transistors, and its other end is coupled to an operating voltage;
One base resistance, its one end is coupled to the base terminal of this bipolar junction transistors, and other end ground connection; And
Two diodes be one another in series, are coupled between this emitter resistance and this base resistance, and couple this operating voltage simultaneously.
3. light adjusting circuit according to claim 1, is characterized in that, wherein, this control dimming unit is variable resistor dimmer, direct current dimmer, pulse-width modulation signal dimmer or above-mentioned both above combinations.
4. light adjusting circuit according to claim 1, is characterized in that, wherein, this filter unit comprises:
One filter resistance, its one end is coupled to this constant current source and this low level prevention unit, and its other end is then coupled to this light and turns off and driver element; And
One filter capacitor, its one end is coupled to the other end of this filter resistance and this light turns off and driver element, its other end then ground connection.
5. light adjusting circuit according to claim 1, it is characterized in that, wherein, this light turn off with driver element be a comparator, and this comparator have be coupled to a reference voltage a first input end, be coupled to one second input of this filter unit and be coupled to an output of this switch element.
6. light adjusting circuit according to claim 1, is characterized in that, wherein, this switch element is a power-type metal-oxide half field effect transistor.
7. light adjusting circuit according to claim 1, is characterized in that, wherein, this low level prevention unit is a diode.
8. light adjusting circuit according to claim 1, is characterized in that, wherein, described power conversion unit is flyback power conversion unit, forward type power conversion unit, LLC resonant mode power supply changeover device or push-pull type power conversion unit.
9. light adjusting circuit according to claim 5, is characterized in that, wherein, this low level prevention unit is a metal-oxide half field effect transistor, and this metal-oxide half field effect transistor has a body diode; Wherein, the drain end of this metal-oxide half field effect transistor is coupled to this constant current source and this filter unit, the source terminal of this metal-oxide half field effect transistor is coupled to this control dimming unit, and the gate terminal of this metal-oxide half field effect transistor is coupled to this output of this comparator.
10. there is a LED power feeding mechanism for light adjusting circuit, it is characterized in that, comprising:
At least one power conversion unit, couples an AC power and carries out voltage transitions with the alternating current exported this AC power, and then output one stabilized power supply gives at least one LED light emission device; And
One light adjusting circuit, comprising:
One constant current source, in order to produce certain electric current;
One controls dimming unit, is coupled to this constant current source, and exports a dim signal after this determines electric current in reception;
One filter unit, is coupled to this control dimming unit to receive this dim signal, and carries out filtering to this dim signal;
One light turns off and driver element, is coupled to this filter unit to receive through this dim signal filtered, and then exports a drive control signal;
One switch element, is coupled to this light and turns off and driver element, this power conversion unit and this LED light emission device, and wherein, this light turns off and drives with this drive control signal with driver element and control this switch element, to make this LED light emission device luminous; And
One low level prevention unit, one is electrically held and is coupled to this control dimming unit, and its another electrical end couples this constant current source and this filter unit; Wherein, this low level prevention unit is pulled downwardly to low level in order to stop the signal level of this dim signal.
The 11. LED power feeding mechanisms with light adjusting circuit according to claim 10, it is characterized in that, wherein, this constant current source comprises:
One bipolar junction transistors, is coupled to this low level prevention unit and this filter unit with its collector terminal;
One emitter resistance, its one end is coupled to the emitter-base bandgap grading end of this bipolar junction transistors, and its other end is coupled to an operating voltage;
One base resistance, its one end is coupled to the base terminal of this bipolar junction transistors, and other end ground connection; And
Two diodes be one another in series, are coupled between this emitter resistance and this base resistance, and couple this operating voltage simultaneously.
The 12. LED power feeding mechanisms with light adjusting circuit according to claim 10, is characterized in that, wherein, this control dimming unit is variable resistor dimmer, direct current dimmer, pulse-width modulation signal dimmer or above-mentioned both above combinations.
The 13. LED power feeding mechanisms with light adjusting circuit according to claim 11, it is characterized in that, wherein, this filter unit comprises:
One filter resistance, its one end is coupled to this constant current source and this low level prevention unit, and its other end is then coupled to this light and turns off and driver element; And
One filter capacitor, its one end is coupled to the other end of this filter resistance and this light turns off and driver element, its other end then ground connection.
The 14. LED power feeding mechanisms with light adjusting circuit according to claim 10, it is characterized in that, wherein, this light turn off with driver element be a comparator, and this comparator have be coupled to a reference voltage a first input end, be coupled to one second input of this filter unit and be coupled to an output of this switch element.
The 15. LED power feeding mechanisms with light adjusting circuit according to claim 10, is characterized in that, wherein, this switch element is a power-type metal-oxide half field effect transistor.
The 16. LED power feeding mechanisms with light adjusting circuit according to claim 10, is characterized in that, wherein, this low level prevention unit is a diode.
The 17. LED power feeding mechanisms with light adjusting circuit according to claim 10, it is characterized in that, wherein, described power conversion unit is flyback power conversion unit, forward type power conversion unit, LLC resonant mode power supply changeover device or push-pull type power conversion unit.
The 18. LED power feeding mechanisms with light adjusting circuit according to claim 14, is characterized in that, wherein, this low level prevention unit is a metal-oxide half field effect transistor, and this metal-oxide half field effect transistor has a body diode; Wherein, the drain end of this metal-oxide half field effect transistor is coupled to this constant current source and this filter unit, the source terminal of this metal-oxide half field effect transistor is coupled to this control dimming unit, and the gate terminal of this metal-oxide half field effect transistor is coupled to this output of this comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410298967.2A CN105282905B (en) | 2014-06-27 | 2014-06-27 | Light adjusting circuit and the LED power feeding mechanism with the light adjusting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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