CN105282896A - Power supply control circuit of LED lamp - Google Patents
Power supply control circuit of LED lamp Download PDFInfo
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- CN105282896A CN105282896A CN201410229715.4A CN201410229715A CN105282896A CN 105282896 A CN105282896 A CN 105282896A CN 201410229715 A CN201410229715 A CN 201410229715A CN 105282896 A CN105282896 A CN 105282896A
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- 230000005669 field effect Effects 0.000 claims description 16
- 230000036962 time dependent Effects 0.000 claims description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 abstract 2
- 238000005282 brightening Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The invention relates to a power supply control circuit of an LED lamp, which comprises an AC/DC constant current power supply and an LED lamp load. The power supply control circuit of the LED lamp further comprises a control module. The control module comprises a control signal generation unit, a load feedback unit, a comparison unit and a shunting unit, wherein the control signal generation unit is used for providing control signals and providing a reference value for the comparison unit; the load feedback unit is used for providing load signals for the comparison unit; the comparison unit compares the load signals and the reference value and outputs the control signals; and the shunting unit is switched on or off according to the control signals so as to control the current loaded at the shunting unit. The power supply control circuit of the LED lamp controls the shunting unit to shunt direct current provided by the AC/DC constant power supply, so that a purpose of changing the current loaded at the LED lamp is achieved, and thus a purpose of changing brightness variations of the LED lamp load is achieved.
Description
Technical field
The present invention relates to a kind of lamp power equipment, particularly a kind of LED lamp power control circuit.
Background technology
In general daily life, all can see various lighting apparatus everywhere, such as, fluorescent lamp, street lamp, desk lamp, artistic lamp etc.In above-mentioned lighting apparatus, major part is using osram lamp as illuminating source traditionally.In recent years, because science and technology is maked rapid progress, utilized light-emitting diode (LED) as illuminating source.Notably, except lighting apparatus, for general traffic sign, billboard, car light etc., also all change into and use light-emitting diode as illuminating source.Use light-emitting diode as illuminating source, its benefit is power saving, and brightness is larger, therefore generalization gradually in use.
Along with popularizing of LED lamp, increasing occasion brings into use LED lamp.And the occasion of LED strip shape light fixtures is used at some, the brightness change when LED switch frequency, the opening or closing of brightness change, particularly LED needs to carry out regular change according to the demand of user.Such as, when using light fixture at night, user does not often wish that light fixture just brightens quickly, but wishes light fixture brightening slowly, because bright meeting causes the inadaptable of human eye quickly.In like manner, user does not wish that light fixture is just closed quickly, causes the discomfort of human eye yet at night.
Summary of the invention
In view of this, be necessary to provide a kind of LED lamp power control circuit that can control the brightness change of the LED of LED lamp, to meet the demand.
A kind of LED lamp power control circuit comprises an AC/DC constant-current supply, and one obtains the LED lamp load of the energy by described AC/DC constant-current supply.Described LED lamp power control circuit also to comprise in a loop being electrically connected between described AC/DC constant-current supply and LED lamp load and for controlling the control module that described LED lamp load brightness changes.Described control module comprises a control signal generating unit, a load feedback unit, a comparing unit, and a dividing cell.Described control signal generating unit is used for providing control signal and provides reference value for described comparing unit.Described load feedback unit is for detecting described LED lamp load and providing load signal for described comparing unit.The more described load signal of described comparing unit and reference value also export control signal.The control signal conducting that described dividing cell exports according to described comparing unit or turn off with the size of current of output control signal controlled loading in this dividing cell according to comparing unit.
Compared with prior art, control module is provided in the circuit of described LED lamp power control circuit, there is in this control module described control signal generating unit, this control signal generating unit provides the signal of the LED brightness change controlling described LED lamp load, this signal is compared with load signal by described comparing unit, thus control described dividing cell the direct current that AC/DC constant-current supply provides is shunted, thus reach the object changing the electric current be carried in described LED lamp load, and then reach the object of the brightness change changing described LED lamp load.When described control signal generating unit provides one to become large control signal gradually in time, the LED of described LED lamp load will by secretly brightening gradually, reach the requirement carrying out regular change according to the demand of user, brightening slowly described above, bright meeting can not cause the inadaptable of human eye quickly.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiments of the invention are described, wherein:
Fig. 1 is the circuit theory diagrams of a kind of LED lamp power control circuit provided by the invention.
Fig. 2 is the circuit diagram of the LED lamp power control circuit of Fig. 1.
The LED lamp power control circuit that Fig. 3 is Fig. 1 there is the contrast figure of signal curve that AC/DC constant-current supply, dividing cell and control signal generating unit export.
Embodiment
Based on accompanying drawing, specific embodiments of the invention are further elaborated below.Should be appreciated that specific embodiment described herein is only as embodiment, the protection range be not intended to limit the present invention.
Refer to Fig. 1 and Fig. 2, it is the circuit theory diagrams of a kind of LED lamp power control circuit 100 provided by the present invention.Described LED lamp power control circuit 100 comprises an AC/DC constant-current supply 10, one obtains the LED lamp load 11 of the energy by described AC/DC constant-current supply 10, and the control module 12 in a loop being electrically connected between described AC/DC constant-current supply 10 and LED lamp load 11.Described control module 12 is for controlling described LED lamp load 11 brightness change.It is envisioned that described LED lamp power control circuit 100 can also comprise other functional modules, as filter circuit etc.
Described AC/DC constant-current supply 10 is for providing DC power supply according to the power reguirements of LED lamp load 11.One end of this AC/DC constant-current supply 10 connects civil power, and the other end exports the direct current being applicable to LED and using.As shown in Figure 2, it is the circuit diagram of described AC/DC constant-current supply 10, and it includes transformer circuit, the various functional unit such as filter circuit, and its technology known by those skilled in the art, does not repeat them here.As shown in Figure 3, the time dependent curve of electric current that exports for described AC/DC constant-current supply 10 of curve A.As can be seen from the curve A of Fig. 3, the current value that described AC/DC constant-current supply 10 exports is time-independent steady state value.
Described LED lamp load 11 comprises at least one LED.This LED is known by those skilled in the art, and it can be one, also can be in series or in parallel with multiple.
Described control module 12 comprises a control signal generating unit 121, load feedback unit 122, comparing unit 123, and a dividing cell 124.
Described control signal generating unit 121 comprises an analog circuit or single-chip microcomputer.In the present embodiment, described control signal generating unit 121 comprises a single-chip microcomputer N1, the control signal required for its demand according to user generates.This control signal can be a fixed value, also can be time dependent curve.In the present embodiment, as shown in Figure 3, the signal that described control signal generating unit 121 provides is a time dependent curve.Current curve C is as shown in Figure 3 the current curve requiring to be applied in described LED lamp load 11.As can be seen from this curve B, when time t is 0 to 6, electric current is very little, and slowly raise, thus the LED of described LED lamp load 11 can be made slowly to brighten, and after the time, t was from 6, current value becomes the rated current required for described LED lamp load 11 gradually, i.e. the LED of described LED lamp load 11 enters normal light application time.It is understood, however, that the time that described electric current slowly raises can be 6 seconds, but other numerical value, it can become according to the demand of user, at this, is only an embodiment.The meaning of this curve B is, when in night, user opens the LED of described LED lamp load 11, can not just become very bright quickly, and human eye is not suitable with, uncomfortable, but light gradually, to the process that human eye one adapts to.Described control signal generating unit 121 is in the control signal of some special times by an output special value, and namely at a certain special time, the numerical value of this control signal is changeless, and just over time, the value of this control signal is change.As can be seen from Figure 2, this control signal generating unit 121 also comprises some other functional circuit, as filter circuit, and overvoltage crowbar, and provide the bleeder circuit etc. of suitable voltage for described single-chip microcomputer.
Described load feedback unit 122 is electrically connected in the loop of LED lamp load 11, and comprises at least one resistance.In the present embodiment, described load feedback unit 122 comprises three resistance R15, R16, R17 in parallel.By detecting the voltage at described three parallel resistance R15, R16, R17 two ends, the load signal of described LED lamp load 11 namely can be detected.Can adjust targetedly the brightness of the LED of described LED lamp load 11 according to this load signal detected, the brightness of LED is changed according to the requirement of user.
Described comparing unit 123 comprises an operational amplifier N2B, a loop compensation circuit, and other components and parts.Described operational amplifier N2B is mainly used in processing comparing from the control signal of described control signal generating unit 121 and the load signal of described load feedback unit 122 of input and exporting control signal.Therefore the reverse input end of this operational amplifier N2B and the output of described control signal generating unit 121 are electrically connected and output signal to receive it.And its positive input and described load feedback unit 122 output are electrically connected and output signal to receive it.The output of this operational amplifier N2B and the input of described dividing cell 124 are electrically connected and work to control described dividing cell 124.Between the output that described loop compensation circuit is electrically connected at described operational amplifier N2B and positive input, and comprise a resistance R9 and the electric capacity C4 connected with this resistance R9.Described loop compensation circuit is used for making described operational amplifier N2B working stability, and its operation principle is exactly utilize the in good time electric discharge of described electric capacity C4 to carry out compensated operational amplifier N2B voltage instability at work.
Described dividing cell 124 is opened according to the output signal of described comparing unit 123 or is closed, and therefore, this dividing cell 124 is electrically connected between described comparing unit 123 and LED lamp load 11.Described dividing cell 124 comprises a shunt resistance R20 and a field effect transistor or triode of connecting with this shunt resistance R20.It is well known that field effect transistor or triode are a kind of a kind of semiconductor device utilizing the field effect in control inputs loop to carry out output control loop electric current, that is the characteristic of this semiconductor device is the curve according to field effect change.In the present embodiment, described shunt resistance 124 comprises a field effect transistor Q2.Refer to Fig. 3, the curve C of this Fig. 3 is the characteristic curve of described field effect transistor Q2.Comparing and subtracting difference by the curve A of the output current of described AC/DC constant-current supply 10 and the curve C of described field effect transistor, just can draw the load curve be carried in described LED lamp load 11, i.e. curve B.
At work, under control by described operational amplifier N2B, when the described load signal from LED lamp load 11 be less than that described control signal generating unit 121 provides as control signal with reference to value time, described field effect transistor or triode will be in closed condition.And when described load signal is greater than described reference value, described field effect transistor or triode will be in opening.Therefore, in the first 6 second time that LED lamp load 11 is opened, the current signal that load signal provides for AC/DC constant-current supply 10, as can be seen from the figure this load signal reference value that will be greater than control signal generating unit 121 and provide, now, the field effect transistor of described dividing cell 124 will be opened, thus the electric current that AC/DC constant-current supply 10 provides is shunted, the size of concrete shunting deducts the size of the current value that described dividing cell 124 loads for current value that at a time AC/DC constant-current supply 10 provides.And the size of the current value that dividing cell 124 loads is determined in the resistance in this moment by field effect transistor or triode.When operation a period of time, due to the effect of dividing cell 124, the reference value that control signal generating unit 121 is provided increases gradually, is finally greater than the load signal from LED lamp load 11.Now, field effect transistor or the triode of described dividing cell 124 will be in closed condition, thus described LED lamp load 11 enters normal rating Brightness Duty state, and described control module 12 also completes the control of the brightness change of a LED simultaneously.
Be understandable that, the brightness of described LED lamp load 11 can also present more how different brightness changes, the curve of the control signal that its version is provided by described control signal generating unit 121 decides, if this curve is waveform, then described LED lamp load 11 presents light and shade interval variation.
Compared with prior art, control module 12 is provided in the circuit of described LED lamp power control circuit 100, this control module 12 li has described control signal generating unit 121, this control signal generating unit 121 provides the signal of the LED brightness change controlling described LED lamp load 11, this signal is compared with load signal by described comparing unit 122, thus the direct current controlling described dividing cell 124 pairs of AC/DC constant-current supplies and provide is shunted, thus reach the object changing the electric current be carried in described LED lamp load 11, and then reach the object of the brightness change changing described LED lamp load 11.When described control signal generating unit 121 provides one to become large control signal gradually in time, the LED of described LED lamp load 11 will by secretly brightening gradually, reach the requirement carrying out regular change according to the demand of user, brightening slowly described above, bright meeting can not cause the inadaptable of human eye quickly.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all do in the spirit and principles in the present invention any amendment, equivalent to replace and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a LED lamp power control circuit, it comprises an AC/DC constant-current supply, and one obtains the LED lamp load of the energy by described AC/DC constant-current supply, it is characterized in that: described LED lamp power control circuit also to comprise in a loop being electrically connected between described AC/DC constant-current supply and LED lamp load and for controlling the control module that described LED lamp load brightness changes, described control module comprises a control signal generating unit, a load feedback unit, a comparing unit, and a dividing cell, described control signal generating unit is used for providing control signal and provides reference value for described comparing unit, described load feedback unit is for detecting described LED lamp load and providing load signal for described comparing unit, the more described load signal of described comparing unit and reference value also export control signal, the control signal conducting that described dividing cell exports according to described comparing unit or turn off with the size of current of output control signal controlled loading in this dividing cell according to comparing unit.
2. LED lamp power control circuit as claimed in claim 1, is characterized in that: described control signal generating unit is analog circuit or single-chip microcomputer.
3. LED lamp power control circuit as claimed in claim 1, be is characterized in that: described load feedback unit comprises at least one resistance, can be detected the load signal of described LED lamp load by the magnitude of voltage detecting described resistance two ends.
4. LED lamp power control circuit as claimed in claim 1, it is characterized in that: described comparing unit comprises an operational amplifier, reverse input end and the control signal generating unit of described operational amplifier are electrically connected, the positive input of described operational amplifier and load feedback unit are electrically connected, and output and the described dividing cell of described operational amplifier are electrically connected.
5. LED lamp power control circuit as claimed in claim 4, it is characterized in that: described comparing unit also comprises a loop compensation circuit be connected between described reverse input end and output, this loop compensation circuit is used for making described operational amplifier working stability.
6. LED lamp power control circuit as claimed in claim 5, is characterized in that: described loop compensation circuit comprises a resistance R9 and the electric capacity C4 connected with this resistance R9.
7. LED lamp power control circuit as claimed in claim 1, is characterized in that: the signal that described control signal generating unit provides is a fixed value or a time dependent curve.
8. LED lamp power control circuit as claimed in claim 1, it is characterized in that: described dividing cell comprises a shunt resistance R20 and a field effect transistor or triode of connecting with this shunt resistance R20, when described load signal is less than reference value, described field effect transistor or triode are in closed condition.
9. LED lamp power control circuit as claimed in claim 1, it is characterized in that: described dividing cell comprises a shunt resistance and a field effect transistor or triode of connecting with this shunt resistance, when described load signal is greater than described reference value, described field effect transistor is in opening.
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| CN201410229715.4A CN105282896B (en) | 2014-05-27 | 2014-05-27 | A kind of LED lamp power control circuit |
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| CN201410229715.4A CN105282896B (en) | 2014-05-27 | 2014-05-27 | A kind of LED lamp power control circuit |
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| CN105282896A true CN105282896A (en) | 2016-01-27 |
| CN105282896B CN105282896B (en) | 2019-08-02 |
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