CN100556220C - The power conservation type driving mechanism of semiconductor luminous assembly - Google Patents
The power conservation type driving mechanism of semiconductor luminous assembly Download PDFInfo
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- CN100556220C CN100556220C CNB2006101387553A CN200610138755A CN100556220C CN 100556220 C CN100556220 C CN 100556220C CN B2006101387553 A CNB2006101387553 A CN B2006101387553A CN 200610138755 A CN200610138755 A CN 200610138755A CN 100556220 C CN100556220 C CN 100556220C
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Abstract
The invention provides a kind of power conservation type driving mechanism of semiconductor luminous assembly, it is characterized in that comprising that one is coupled in the province's electric unit between source current input port and the control output end mouth directly or indirectly, for example can store and the sampling/maintenance (sample of burning voltage; Hold) circuit.By design of the present invention, the source current input port only needs the input electric current identical with the conventional ADS driving device in a period, and all the other periods then can be imported lower electric current, to reach the effect of power saving.
Description
Technical field
The invention relates to a kind of power conservation type driving mechanism of semiconductor luminous assembly, refer to the power conservation type driving mechanism of a kind of LED of being applicable to especially.
Background technology
In general, the electric current of the LED that flows through is fixed current (I_LED), and LED drive integrated circult (IC, integrated circuit) is then in order to provide the mechanism of a generation fixed current (I_LED).The LED drive IC generally includes a fixed potential and the common baseline current-source that forms of specific electrical resistance, and stabling current (I_REXT) and several current mirrors (multiple current mirror) by the outer meeting resistance of flowing through produces I_LED again.Wherein, I_LED and I_REXT have the multiple relation:
I_LED＝M_TOTAL×I_REXT
Wherein, M_total is the current mirror multiple.Yet baseline current-source and current mirror need use big electric current, cause total consumption power to improve.With single drive integrated circult is example:
I_LED＝60mA，
I_REXT＝1mA，
M_TOTAL＝M1×M2＝10×6；
Wherein, M1 is the multiple of first order current mirror, and just the multiple of current source and first order electric current relation is to be produced by the integrated circuit mapping; M2 is the multiple of second level current mirror, just first order electric current and the multiple relation of deciding electric current that exports LED to.By following formula as can be known, the minimum current sinking of integrated circuit is 11mA (=I_REXT (1mA)+first order integrated circuit mapping mirror currents (10mA)).
Integrated circuit is decided electric current for generation needs constant drain electric current 12mA (electric current (1mA) of=I_REXT (1mA)+first order integrated circuit mapping mirror currents (10mA)+required auxiliary circuit of generation current mirror effect).
Sampling/maintenance (sample and hold) circuit is a kind of known circuit design skill, is generally used for extracting voltage or burning voltage.Decide the required specific voltage of electric current output if be apt to add store, then can reduce integrated circuit and decide the required constant drain electric current of electric current for producing.
As for the known pulse-width modulation of another kind (PWM, pulse width modulation) formula drive IC, decide current drives LED though also can provide, but still have the shortcoming of consumes energy.
The present invention manufactures and designs experience in conjunction with electronic circuit professional knowledge and photoelectric subassembly, through repeatedly entity test, prove that above-mentioned sampling/holding circuit has very good power saving effect to deciding electric current LED drive IC, and can push away the application of Shen according to this to other semiconductor luminous assembly.
Summary of the invention
The object of the present invention is to provide a kind of drive unit of semiconductor luminous assembly, it has significant power saving effect.
The invention provides a kind of power conservation type driving mechanism of semiconductor luminous assembly, one is coupled to the source current input port of an external voltage source of supply; One is connected to the control output end mouth of semiconductor luminescence component, can provide this semiconductor luminous assembly luminous required energy; And an input and the direct or indirect respectively province's electric unit that is coupled to this source current input port and this control output end mouth of output, stored voltage; This drive unit is characterised in that: this source current input port provides the electric current I 1 that varies in size and electric current I 2 to this drive unit in short different period T1, the period T2 of two segment lengths respectively, T1＜T2, I1＞I2, the electric current of this source current input port input has cyclic variation, and this province's electric unit provides a burning voltage to this control output end mouth, and wherein this province's electric unit is a sampling/holding circuit.
The invention provides a kind of power conservation type driving mechanism of semiconductor luminous assembly, in order to light or to control the brightness of semiconductor luminescence component, this drive unit has a source current input port that is coupled to an external voltage source of supply, to provide this drive unit required operating current; This drive unit is characterised in that: this source current input port provides the electric current I 1 that varies in size and electric current I 2 to this drive unit in short different period T1, the period T2 of two segment lengths respectively, T1＜T2, I1＞I2 is by the electric current tool cyclic variation of this source current input port input.
The invention provides a kind of power conservation type driving mechanism of semiconductor luminous assembly, comprising: one is coupled to the source current input port of an external voltage source of supply; One is coupled to the integrated circuit current output terminal mouth of an external ground line; One control output current is with reference to the multiple port, the output fixed potential is also decided electric current and is duplicated this multiple of deciding current mirror relation to another electric current output controlling and driving output port to provide to outer meeting resistance, the control semiconductor luminous assembly is to provide this semiconductor luminous assembly luminous required drive current; Reach province's electric unit that its input and output are coupled to this source current input port and integrated circuit current output terminal mouth respectively directly or indirectly; The source current input that this province's electric unit provides obtains electric current I 1 in period T1, output is input current I2 in period T2 then, I1＞I2, and wherein this province's electric unit is a sampling/holding circuit.
Province of the present invention electric unit can be sampling/maintenance (sample﹠amp; Hold) circuit or other suitable circuit design.
Power conservation type driving mechanism of the present invention generally includes certain current mirror and produces circuit (currentmirror) or a pulse-width modulation (PWM, Pulse Width Modulation) generator.Power conservation type driving mechanism of the present invention also comprises a control switch usually, in order to light light-emitting semi-conductor components or to control its brightness.
Description of drawings
Fig. 1 shows a typical LED driving IC chip and an output/input port thereof;
The similar cyclic variation of Fig. 2 display driver IC supply current;
Fig. 3 and be coated with to be respectively and decide in current drives IC and the PWM drive IC block schematic diagram of sampling/holding circuit to be set;
Fig. 5 shows the preferred circuit design implementation example of certain current drives IC;
Fig. 6 shows actual emulation and measures the voltage of integrated circuit current output terminal mouth (REXT);
Fig. 7 is the time shaft enlarged drawing of Fig. 6.
The schema components symbol description
Work linear amplifier 10 current mirrors 20
Sampling/holding circuit 30 switches 31
Embodiment
Preferred embodiment cooperation of the present invention is graphic, and details are as follows.
Fig. 1 is a typical LED driving IC chip, and its output/input port that connects the encapsulation pin generally includes source current input port (VCC), a plurality of LED control output end mouth, earth current output port (GND) and adjusts the integrated circuit current output terminal mouth (REXT) of control output current.
The external resistance of integrated circuit current output terminal mouth (REXT) (Rext) forms baseline current-source.The electric current of baseline current-source amplifies several times through internal circuit, exports each corresponding control output end mouth that connects of serial connection LED negative electrode institute again to, and each anode that is connected in series LED then is connected to certain voltage source (V_LED) jointly; By this, then can light and control the brightness of LED.As shown in the figure, the electric current of the source current input port (VCC) of flowing through is I_VCC, and the electric current of flow through earth current output port (GND) and outer meeting resistance (Rext) is respectively I_GND and I_REXT.
One of feature of the present invention shows that promptly drive IC supply current I_VCC has I1 and two kinds of variations of I2.As shown in Figure 2, in a relative short time T 1, flow into electric current I 1 greatly; And in a relative long time T 2, flow into less electric current I2; The average current size is Ia.In wherein big electric current I 1 and the known technology, the required fixed current of LED driving IC chip is identical.Apparently, Ia is little more a lot of than I1, therefore can reach power saving effect.Electric current I _ the VCC of source current input port (VCC) has periodic variation owing to flow through, make the electric current I _ GND of flow through earth current output port (GND) and non-essential resistance (Rext) and I_REXT also with periodically change.
Reach above-mentioned power saving effect, can do suitably design at the drive IC internal circuit.Preferred embodiment of the present invention promptly is to set up a sampling/maintenance (sample and hold) circuit.Fig. 3 and Fig. 4 are respectively and decide in current drives IC and the PWM drive IC block schematic diagram of sampling/holding circuit to be set.Deciding current drives IC is to decide between current generator and the LED control output end mouth sampling/holding circuit to be set; The PWM drive IC then is between energy gap voltage generator (bandgap generator) and PWM generator sampling/holding circuit to be set, and wherein the controlling and driving that act as of electric current feedback circuit is exported the LED constant current.By detecting voltage/feedback circuit,, promptly begin to sample when sampling/holding circuit output voltage is detected error with former set point when reaching a limit value (present embodiment is 0.001%).
Fig. 5 then further specifies a preferred circuit design example at deciding current drives IC.Among the figure, the Vi+ of work linear amplifier 10 accepts the fixed potential that the energy gap voltage generator is produced, Vi-is connected to outer meeting resistance, can provide baseline current-source one fixed current, and source current input port (VCC) then provides baseline current-source one fixed voltage and other circuital current.The baseline current-source of present embodiment is a current mirror (currentmirror) 20, typically comprises two nmos pass transistors and two PMOS transistors, and an external resistance (Rext) of its output is in order to adjust the size of current of baseline current-source.
In this preferred embodiment, sampling/holding circuit 30 comprises a switch 31 and an electric capacity 32; The ON/OFF of switch 31 is by 40 controls of detecting voltage/feedback circuit.When electric capacity 32 sufficient suitable potential, switch 31 is OFF, and continues the gate of output burning voltage VP to nmos transistor switch 50; Can produce fixed current I_LED by this, to drive and to control the brightness of corresponding LED 60.When the voltage that detects sampling/holding circuit 30 output when detecting voltage/feedback circuit 40 is lower than 0.99999VP, just opens switch 31 and be ON, make electric capacity 32 begin charging.In fact, it is extremely short to charge to VP required time T1 by 0.99999VP, and electric current I _ LED of the LED that therefore flows through is almost constant, and brightness is also almost constant.Relatively, output voltage is reduced to 0.99999VP required time T2 by VP but antipode is long.Change speech, only needing very provide current mirror 20 electric current I 1 identical with known drive IC in the short time, and all the other times only need provide less electric current I2, just can obtain regulated output voltage VP; And do not influence the luminous performance of LED fully.Can need to adjust the above-mentioned opportunity that begins to sample according to actual design, and just the error of sampling/holding circuit output voltage and former set point is not limited to 0.001%.
In general, a panel needs about 10,000 drive IC altogether; If the operating current of each IC is reduced to 1.2mA by the present invention, just one of the ten minutes of traditional IC institute consumed current (12mA), total current that then the present invention consumes is about 12A (=1.2mA * 10,000) only.
As previously mentioned, when the electric current I _ VCC of the source current input port (VCC) of flowing through has periodic variation, the electric current I _ GND of then flow through earth current input port (GND) and non-essential resistance (Rext) and I_REXT also with periodically change.Therefore, the voltage V_REXT that a requirement is surveyed integrated circuit current output terminal mouth (REXT) just can learn I_REXT, and further learn the variation of I_VCC.
The present invention is through realistic simulation and measure the voltage V_REXT of integrated circuit current output terminal mouth (REXT), the result as shown in Figure 6, Fig. 7 then amplifies about 100 times with the time shaft of Fig. 6.Among the figure, T1 is about 8 μ s, and T2 is about 800 μ s, and just T2 is about 100 times of T1.V1 is about 1.24v (Bandgap outputvoltage), and V2 then is almost 0; Just the size of I1 is identical with known drive IC, and I2 is about 0, is consistent with the current characteristic of Fig. 2.Fact proved that the present invention can reach above-mentioned power saving effect really, is the technology of a great commercial value and competitiveness so economize electrical efficiency.
Claims (9)
1. the power conservation type driving mechanism of a semiconductor luminous assembly is characterized in that comprising:
One is coupled to the source current input port of an external voltage source of supply;
One is connected to the control output end mouth of semiconductor luminescence component, can provide this semiconductor luminous assembly luminous required energy; And
The province's electric unit that is coupled to this source current input port and this control output end mouth that one input and output are direct or indirect respectively, stored voltage;
This drive unit is characterised in that:
This source current input port provides the electric current I 1 that varies in size and electric current I 2 to this drive unit in short different period T1, the period T2 of two segment lengths respectively, T1＜T2, I1＞I2, the electric current of this source current input port input has cyclic variation, and this province's electric unit provides a burning voltage to this control output end mouth, and wherein this province's electric unit is a sampling/holding circuit.
2. power conservation type driving mechanism as claimed in claim 1 is characterized in that comprising: certain current mirror produces circuit.
3. power conservation type driving mechanism as claimed in claim 1 is characterized in that: comprise a pulse-width modulation generator between this province's electric unit and this light-emitting semi-conductor components.
4. power conservation type driving mechanism as claimed in claim 1 is characterized in that comprising: one in order to control lighting or the control switch of brightness of this light-emitting semi-conductor components.
5. power conservation type driving mechanism as claimed in claim 1 is characterized in that comprising: one is coupled to the integrated circuit current output terminal mouth of an external ground line, and its output current changes with the electric current of this source current input port input.
6. the power conservation type driving mechanism of a semiconductor luminous assembly, in order to light or to control the brightness of semiconductor luminescence component, this drive unit has a source current input port that is coupled to an external voltage source of supply, to provide this drive unit required operating current; This drive unit is characterised in that: this source current input port provides the electric current I 1 that varies in size and electric current I 2 to this drive unit in short different period T1, the period T2 of two segment lengths respectively, T1＜T2, I1＞I2 is by the electric current tool cyclic variation of this source current input port input.
7. power conservation type driving mechanism as claimed in claim 6 is characterized in that comprising: one is coupled to the integrated circuit current output terminal mouth of an external ground line, and its output current changes with the electric current of this source current input port input.
8. the power conservation type driving mechanism of a semiconductor luminous assembly comprises:
One is coupled to the source current input port of an external voltage source of supply;
One is coupled to the integrated circuit current output terminal mouth of an external ground line;
One control output current is with reference to the multiple port, the output fixed potential is also decided electric current and is duplicated this multiple of deciding current mirror relation to another electric current output controlling and driving output port to provide to outer meeting resistance, the control semiconductor luminous assembly is to provide this semiconductor luminous assembly luminous required drive current; Reach province's electric unit that its input and output are coupled to this source current input port and integrated circuit current output terminal mouth respectively directly or indirectly;
This drive unit is characterised in that:
The source current input that this province's electric unit provides obtains electric current I 1 in period T1, output is input current I2 in period T2 then, I1＞I2, and wherein this province's electric unit is a sampling/holding circuit.
9. power conservation type driving mechanism as claimed in claim 8 is characterized in that: more comprise a control switch between this province's electric unit and this input port, in order to control lighting or brightness of this light-emitting semi-conductor components.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101387553A CN100556220C (en) | 2006-11-13 | 2006-11-13 | The power conservation type driving mechanism of semiconductor luminous assembly |
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| CNB2006101387553A CN100556220C (en) | 2006-11-13 | 2006-11-13 | The power conservation type driving mechanism of semiconductor luminous assembly |
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