CN102419611B - Method for stabilizing power consumption of passive element - Google Patents

Abstract

The invention relates to a method for stabilizing the power consumption of a passive element, which is characterized in that when an electronic product comprising the passive element is connected to an alternating current input power source, the corresponding current down regulation quantity is calculated according to input power or output power of definite values and the voltage curve of the input power source. Therefore, when the electronic product is actually applied, the calculated current down regulation quantity can be used for dealing with different-specification or unstable voltage sources, and the goal of stabilizing the input power or the output power is reached.

Description

Stablize the method for the power consumption of passive device

Technical field

The present invention relates to a kind of AC power that is applied to there is fluctuation to stablize the method for the power consumption of passive device, particularly relate to a kind of electric current that offers passive device by adjustment to stablize the method for the power consumption of passive device.

Background technology

Generally include the electronic product of passive device when connecting household AC power, very easily be subject to the unsettled current potential of AC power and affect its running, when this passive device is when determining light emitting diode that electric current controls, because the voltage of AC power is in the time higher than the cut-in voltage of light emitting diode, light emitting diode just can operate, so the current potential degree of stability of this AC power can significantly have influence on the stability of the luminosity of light emitting diode.Refer to Fig. 1 and Fig. 2.Fig. 1 in the general electronic product that uses household AC power comprise light emitting diode the curve map of input voltage/electric current/power input, and Fig. 2 is the corresponding curve map that in Fig. 1, input voltage changes.Observe input voltage curve ac1 and the arrival current curve shown in Fig. 1 known, the voltage ac1 that AC power is supplied is when the cut-in voltage VLED_ON higher than light emitting diode, and the strength of current of light emitting diode just can be promoted to a fixed current intensity I _ LED by zero.And at the current potential of input voltage curve ac1 in the time higher than cut-in voltage VLED_ON (that is the t1 of time point shown in Fig. 1 is to time interval of time point t2), provide merit (Work) that an input power of this input voltage consumes to be the area (indicating this area with oblique line in Fig. 1) that is covered by time shaft corresponding to the power input curve PC1 of mistiming of alternating voltage curve ac1, strength of current I_LED and time point t1 to t2, wherein light-emitting diode output power P equals cut-in voltage VLED_ON and is multiplied by strength of current I_LED.Fig. 2 is that diagram improves its current potential because unsettled phenomenon occurs input voltage, and the input voltage curve that makes light emitting diode ac1 as shown in Figure 1 transfers the situation of the ac2 shown in Fig. 2 to.Now, the represented input voltage of input voltage curve ac2 is also extended for (t1-Δ t) to (t2+ Δ t) higher than the time of cut-in voltage VLED_ON, and wherein Δ t is one period that can ignore its length compared to (t2-t1).Thus, the powertrace PC1 and the PC2 that observe Fig. 2 are known, this input power institute work also as shown in Figure 1 the area change of containing of powertrace PC1 to powertrace PC2, contain area (or observable current curve learns that it is I_LED*2 Δ t that electric current is multiplied by the recruitment of time); In other words, the area between powertrace PC1 and PC2 is this input power because voltage generation wild effect and many works (in Fig. 2, with arrow area coverage upward, representing many works).When the difference of input voltage curve ac1 and ac2 is larger, this input power many works can make the luminosity of light emitting diode more unstable.

Summary of the invention

The present invention has disclosed a kind of AC power that is applied to have fluctuation to stablize the method for the power consumption (Work Consumption) of passive device, when the electronic product that generally comprises passive device to overcome in prior art is provided the unsettled input power of current potential, its input work or output work be unsettled phenomenon also.

The method of the power consumption of disclosed stable passive device comprise when a power supply, offer a passive device the current potential of an input voltage by after not higher than the current potential transferring to higher than a predetermined voltage, according to this power supply, one input work (Input Work) of this passive device input and the current potential of this input voltage are adjusted to the input current that this power supply offers this passive device, so that this input work is constant in fact.

The method of the power consumption of disclosed stable passive device comprise when a power supply, offer a passive device the current potential of an input voltage by after not higher than the current potential transferring to higher than a predetermined voltage, according to an output work (Output Work) of this passive device output and the current potential of this input voltage, adjust the input current that this power supply offers this passive device, so that this output work is constant in fact.

Accompanying drawing explanation

Fig. 1 in the general electronic product that uses household AC power comprise light emitting diode the curve map of input voltage/electric current/power input.

Fig. 2 is the corresponding curve map that in Fig. 1, input voltage changes.

Fig. 3 offers the simple embodiment schematic diagram of the consumed power of passive device for illustrating disclosed adjustment input current to stablize input power.

Fig. 4 for to carry out after the strength of current adjustment process shown in Fig. 3 passive device in the test process of electronic product, and generation is corresponding to the simple schematic diagram of the strength of current curve of the single value of critical voltage.

Reference numeral explanation

VLED_ON cut-in voltage

I_LED strength of current

V_FOLD critical voltage

T1, t2, t1 ', t2 ', t1 ", t2 ", t1-time point

Δt、t2+Δt

Ac1, ac2 voltage curve

PC1, PC2, PC3 powertrace

P power

Embodiment

The invention provides and a kind ofly by corresponding input voltage, adjust input current, to stablize input power, offer the method for the consumed power of passive device, and overcome by this in prior art because of the spread of voltage of input power and make the unsettled phenomenon of luminosity as the light emitting diode of passive device.

Method of the present invention includes at least two embodiment.In one first embodiment, method of the present invention is that input work that input power is done is kept under stable prerequisite, and the input voltage corresponding to changing continuing changes input current intensity; For example, and in one second embodiment, method of the present invention is under the output work that makes passive device (light emitting diode) keeps stable prerequisite, the input voltage corresponding to changing continuing changes input current intensity.The input current intensity reducing described in the invention described above is that the test phase at the electronic product that comprises passive device just determines, and the number that determines to reduce strength of current as described below mode calculate.

Refer to Fig. 3, it offers the simple embodiment schematic diagram of the consumed power of passive device for illustrating disclosed adjustment input current to stablize input power.In Fig. 3, to set in advance a critical voltage V_FOLD higher than cut-in voltage VLED_ON and definite value, its setting means can illustrate after a while separately, when so the difference of the first above-mentioned embodiment and the second embodiment is also only input voltage higher than the value of critical voltage V_FOLD, the setting of input current change amount, therefore following narration is to be applicable to the first embodiment and the second embodiment simultaneously.In Fig. 3, illustrate the voltage curve ac1 shown in original Fig. 1 to make comparisons.Observe the arrival current curve shown in Fig. 3 known, when input voltage curve transfers ac2 to by ac1, and when the current potential of input voltage curve ac2 is during higher than critical voltage V_FOLD, method of the present invention can downgrade input current downwards, to maintain the stable of I/O merit.

Between the t1 to t2 of time point shown in Fig. 3, originally voltage curve ac1 institute work should be the area that powertrace PC1 is covered by time interval (t2-t1), yet due to the unsettled cause of input power, actual voltage curve is transformed into ac2 by ac1, yet method of the present invention is that the current potential of voltage curve ac2 is reduced higher than the corresponding strength of current of the time interval of critical voltage V_FOLD (that is in Fig. 3, time point t1 ' locates to t2 '), and in the related Fig. 2 of making, the powertrace PC2 corresponding to voltage curve ac2 changes the powertrace PC3 shown in Fig. 3 into, to offset original voltage curve ac2 many works in Fig. 2, wherein the value of the value of powertrace PC3 and powertrace PC2 time point (t1-Δ t) to the time interval between time point t1 ' with at time point t2 ', to the time interval between time point (t2+ Δ t), equate.Clearer and more definite, suppose input power time point t1 to t2 take during this period of time voltage curve ac1 to passive device institute work (can be input work or output work) as

and after the voltage curve of input power output changes ac2 into by ac1, at time point (t1-Δ t) to (t2+ Δ t), to passive device institute work, be

the input work that must make input power export in this first embodiment of the present invention is continuously under the prerequisite of definite value, needs satisfied condition to be:

$\underset{t1}{\overset{t2}{\&Integral;}}\mathrm{<figure-callout\; id="1"\; label="PC"\; filenames="HSA00000291341800011.png,HSA00000291341800031.png"\; state="\{\{state\}\}">PC</figure-callout>}1*\mathrm{dt}=\underset{t1-\mathrm{\&Delta;t}}{\overset{t2+\mathrm{\&Delta;t}}{\&Integral;}}\mathrm{PC}3*\mathrm{dt}---\left(1\right)$

If only consider, time point (t1-Δ t) is to t1 " time interval and time point t2 " to the merit increasing in the time interval of (t2+ Δ t) more (in Fig. 3 with the cartographic represenation of area of rising arrow, time point t1 wherein " and t2 " be the intersection point of powertrace PC1 and PC3, and time point t1 " be later than t1 '; time point t2 " early than t2 ') and because reduce input current strength of current and at time point t1 " to t2 " the merit that reduces of the time interval cartographic represenation of area of decline arrow (in the Fig. 3 with), formula (1) can be exchanged into:

$\underset{t1-\mathrm{\&Delta;<figure-callout\; id="1"\; label="t\; t"\; filenames="HSA00000291341800011.png,HSA00000291341800031.png"\; state="\{\{state\}\}">t</figure-callout>}}{\overset{t^{}}{\&Integral;}}(\mathrm{PC}3-\mathrm{PC}1)*\mathrm{dt}+\underset{{t2}^{\&prime;\&prime;}}{\overset{t2+\mathrm{\&Delta;t}}{\&Integral;}}(\mathrm{PC}3-\mathrm{PC}1)=\underset{{\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HSA00000291341800011.png,HSA00000291341800031.png"\; state="\{\{state\}\}">t</figure-callout>}1}^{\&prime;\&prime;}}{\overset{{t2}^{\&prime;\&prime;}}{\&Integral;}}(\mathrm{PC}1-\mathrm{PC}3)*\mathrm{dt}---\left(2\right)$

The left side of formula (2) is representative voltage curve many works of input power while going to ac2 by ac1, and the right side of formula (2) represents few work because having reduced input current intensity.When formula (2) is set up, total input work that input power is done just can equal total input work that the PC1 of powertrace shown in Fig. 1 does in time point t1 to t2 at time point (t1-Δ t) in (t2+ Δ t), and reaches fixing total work.In order to reach the object of fixing total work, the strength of current that time point t1 ' is turned down to input current between t2 ' need to be calculated according to formula (1) or formula (2), because powertrace PC1 is that voltage curve ac1 and strength of current I_LED as shown in Figure 1 determines, and powertrace PC3 is determined by the strength of current being adjusted shown in voltage curve ac2 and Fig. 3, therefore as long as voltage curve ac1, the value of ac2 between time point (t1-Δ t) to (t2+ Δ t) for known (for example can test pack during containing the electronic product of passive device setting voltage curve ac1 and ac2 be different sine voltage sources), and the strength of current I_LED shown in Fig. 1 is known, can determine in Fig. 3 at time point t1 ' to strength of current that between t2 ', each time point is downgraded according to formula (1) or formula (2).

The setting of the V_FOLD of critical voltage shown in Fig. 3 is also to complete in the test process of the above-mentioned electronic product that comprises passive device; For instance, the fabricator of electronic product can be for the corresponding strength of current of adjusting of different fixed value tests of critical voltage V_FOLD.Refer to Fig. 4, it for to carry out after the strength of current adjustment process shown in Fig. 3 passive device in the test process of electronic product, and generation is corresponding to the simple schematic diagram of the strength of current curve of the single value of critical voltage V_FOLD.As shown in Figure 4, after having set a fixed value of critical voltage V_FOLD, before input voltage is not higher than critical voltage V_FOLD, input current intensity continues to remain on I_LED; And after input voltage is higher than critical voltage V_FOLD, input current intensity just can start to downgrade, and the amplitude downgrading is to calculate according to the merit identical condition shown in Fig. 3 (that is formula (1) or formula (2)).Thus, during the passive device that comprises in electronic product in test, just can set the value of different critical voltage V_FOLD, and obtain in advance the arrival current curve corresponding to the value of different critical voltage V_FOLD; When reality is used this electronic product, this electronic product can detect input voltage, and when this input voltage is during higher than the value of the critical voltage V_FOLD setting, can come corresponding adjustment input current intensity, the merit being consumed to stablize electronic product according to the arrival current curve shown in Fig. 4.When considering, under the condition that above-mentioned passive device is light emitting diode, to take and stablize in the first embodiment that input work is object in the present invention, critical voltage V_FOLD can directly produce different arrival current curves to its different value in the above described manner; And take in the present invention, stablize in the second embodiment that output work is object, because the trigger voltage of light emitting diode is fixed value, therefore can directly the value of critical voltage V_FOLD be set as to the trigger voltage of light emitting diode, the area that in Fig. 3, powertrace PC1 is covered by between time point t1 to t2 is the output work that input power is done light emitting diode, and the now calculating of application drawing 3 and formula (1) or (2) is that to stablize output work be prerequisite.Thus, in the situation that I/O merit keeps stable, it is stable that the luminosity of light emitting diode also can keep.

The applied passive device of the present invention, except light emitting diode, also can be applicable to the passive device that resistance etc. has different size, therefore the kind that above-described embodiment is changed to passive device must be considered as category of the present invention.

The present invention has disclosed a kind of method of power consumption of stable passive device.The method, according to the voltage curve of the input work of definite value or output work and input power, calculates the corresponding electric current amount of downgrading.Thus, the electronic product that includes passive device can be applied the above-mentioned electric current amount of downgrading of calculating and deal with different size or unsettled voltage source when actual operation, even if electronic product is connected on current potential unsettled input power, still can realizes the object of stablizing input work or output work.

The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.

Claims (4)

1. a method for the power consumption of stable passive device, comprises:

The current potential of an input voltage that offers a passive device when an AC power is not by after higher than the current potential transferring to higher than a predetermined voltage, according to this power supply, the pot of an input work of inputting in this passive device very first time section and this input voltage is calculated at the current potential of described input voltage by not adjusting by the intensity being downgraded higher than passive device input current in transferring to not higher than the second time period of the current potential of described predetermined voltage the input current that this power supply offers this passive device to the current potential of described input voltage higher than transferring to higher than the current potential of described predetermined voltage, so that the input work in the time period identical with very first time section is constant in fact.

2. the method for claim 1, wherein this passive device is a resistance or a light emitting diode.

3. a method for the power consumption of stable passive device, comprises:

The current potential of an input voltage that offers a passive device when an AC power is not by after higher than the current potential transferring to higher than an output voltage of this passive device, according to the pot of an output work of exporting in this passive device very first time section and this input voltage, calculate at the current potential of described input voltage by not adjusting by the intensity being downgraded higher than passive device input current in transferring to not higher than the second time period of the current potential of described output voltage the input current that this power supply offers this passive device to the current potential of described input voltage higher than transferring to higher than the current potential of described output voltage, so that the output work in the time period identical with very first time section is constant in fact.

4. method as claimed in claim 3, wherein this passive device is a resistance or a light emitting diode.

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