CN202210893U - Linear constant-current controller, chip, and drive device - Google Patents
Linear constant-current controller, chip, and drive device Download PDFInfo
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- CN202210893U CN202210893U CN2011203649561U CN201120364956U CN202210893U CN 202210893 U CN202210893 U CN 202210893U CN 2011203649561 U CN2011203649561 U CN 2011203649561U CN 201120364956 U CN201120364956 U CN 201120364956U CN 202210893 U CN202210893 U CN 202210893U
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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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Abstract
The utility model discloses a linear constant-current controller, as well as a chip and a drive device both employing the controller. A capacitor is connected between the power source terminal of the controller and reference ground, for supplying the controller in a power down state. The controller comprises a high-voltage MOS tube, an error amplifier, and a dimming circuit, wherein the drain electrode of the high-voltage MOS tube is connected to an input voltage source through a constant-current source load, and the source electrode of that is connected to the reference ground through a detect resistor; one input end of the error amplifier receives the detection signal passing through constant-current source load current, the other input end receives a dimming signal, and the output end of the error amplifier is connected to the grid electrode of the high-voltage MOS tube; and the dimming circuit is used for generating the dimming signal according to the current detection signal. The utility model provides a solution mechanism which realizes linear constant-current switch dimming function at a low cost, and can effectively save energy.
Description
Technical field
The utility model relates to linear constant-current controller circuit, in particular to a kind of linear constant-current controller of high voltage that is used to drive current source loads, and the chip and the drive unit that comprise this controller.
Background technology
Because have the light efficiency height, the life-span is long, radiationless and characteristics such as low-power consumption, the application of light-emitting diode (LED) in lighting industry is increasingly extensive.A kind of as in the current source loads, LED need with constant pressure source load Different control device.At present, industrial quarters mainly contains the controller of two big types of driving LED.One type is the switch constant-current controller, and main feature need to be inductance and transformer, and efficient generally all realizes higherly under various conditions, but cost is also high simultaneously.Another kind of is linear constant-current controller, and it does not need inductance and transformer, though efficient is difficult to realize highly under certain conditions, cost is very low.
With reference to Fig. 1, Fig. 1 shows the linear constant current scheme of prior art.Wherein, after rectifier bridge 180 rectifications, the interchange 110V or the alternating current 220V that are provided by global lighting mains convert DC input voitage VIN into.LED load 190 is serially connected with high-voltage MOS pipe 101 and constant-current controller 100.Constant-current controller 100 is used to realize constant current control, and high-voltage MOS pipe 101 is born unnecessary voltage and power dissipation, just heat radiation.Resistance 103, voltage stabilizing didoe 104 is in order to realizing voltage clamp, to the grid of high-voltage MOS pipe 101 suitable direct voltage is provided.
Yet above-mentioned linear constant current scheme can't realize the switch dimming function.The switch light modulation means, opens and close the brilliance control that realizes the LED lamp through the LED light fixture.For example, three sections complete switch light modulation processes can design as follows: turn on light for the first time, the LED lamp is lighted with 10W; Turn off lamp, lamp has not worked; Open lamp once more with interior in 3 seconds, the brightness of LED lamp becomes 5W, and brightness reduces half the, and is also just energy-conservation half the; Turn off lamp again, lamp has not worked; Again open lamp with interior in 3 seconds, the brightness of LED lamp becomes 2.5W, and like this, brightness has only 1/4, just can save energy 3/4; Turn off lamp again, lamp has not worked; Open lamp again with interior in 3 seconds, the brightness of LED lamp becomes 10W again, and it is maximum that brightness reaches.And no matter lamp brightness is in any state, as long as the time of turning off the light surpassed for 3 seconds, all will get back to the high-high brightness state after turning on light once more, the resetting of Here it is LED lamp luminance state.Certainly, the switch light modulation not only can be made three sections, can also make other any section, such as two sections, four sections, five sections, six sections or the like, even makes electrodeless light modulation.
The utility model content
The purpose of the utility model is, can't realize the defective of switch dimming function a kind of settlement mechanism with the linear constant current switch dimming function of implemented with low cost being provided to existing linear constant current scheme, thus energy savings effectively.Undoubtedly, this present situation to present global energy shortage has realistic meanings.
The above-mentioned purpose of the utility model realizes through the device that linear constant-current controller, chip and driving current source loads are provided.
According to first aspect; A kind of linear constant-current controller is provided; Its power end with reference to ground between be connected a capacitor, in order to be the power supply of said controller under power-down state, said controller comprises: high-voltage MOS pipe; Its drain electrode is connected to input voltage source through current source loads, and its source electrode detects resistance through one and is connected to reference to ground; Error amplifier, one input end receives the detection signal of the said current source loads electric current of flowing through, and another input receives a dim signal, and its output connects the grid of said high-voltage MOS pipe; And light adjusting circuit, in order to according to said current detection signal, when powering on, produce said dim signal.
In first aspect; Preferably, said light adjusting circuit comprises power down judgement and brightness regulating circuit, and said power down judgement and brightness regulating circuit comprise: first comparator; In order to said current detection signal and the reference signal that is approximately zero are compared, and produce the first output signal; Timer, in order to a scheduled time then, with said first output signal see off; And luminance state register and decoder, the first output signal adjustment luminance state register based on timer is seen off changes said dim signal when powering on.
Preferably, the said scheduled time is at least 10 milliseconds.
Preferably, said light adjusting circuit also comprises reset circuit, and said reset circuit comprises: first resistance that is connected with said controller power source end; With second resistance that said first resistance is connected in series, said first, second resistance is parallelly connected with said capacitor; And second comparator, compare in order to the dividing potential drop and a reset threshold that will on said second resistance, produce, and produce the second output signal, based on the said second output signal, said luminance state register and decoder reset.
Preferably, said power down judgement and brightness regulating circuit also comprise: the 3rd comparator compares in order to the dividing potential drop and a power down threshold value that will on said second resistance, produce, and produces the 3rd output signal; And or door, one input end receives said the 3rd output signal, another input receives the first output signal that said timer sees off, its output is connected to said luminance state register and decoder, provides signal with adjustment luminance state register.
Preferably, said dim signal adopts direct current signal or pwm signal.
Preferably, the drain breakdown voltage of said high-voltage MOS pipe is greater than the maximum voltage value of input voltage source.
Preferably, said current source loads is the LED load.
According to second aspect, a kind of chip is provided, said chip comprises the controller in the above-mentioned first aspect.
According to the third aspect; A kind of device that drives current source loads is provided, comprises a linear constant-current controller and a capacitor, said capacitor is connected the power end of said controller and with reference between the ground; In order to be said controller power supply under power-down state; Said controller comprises: high-voltage MOS pipe, and its drain electrode is connected to input voltage source through said current source loads, and its source electrode detects resistance through one and is connected to reference to ground; Error amplifier, one input end receives the detection signal of the said current source loads electric current of flowing through, and another input receives a dim signal, and its output connects the grid of said high-voltage MOS pipe; And light adjusting circuit, in order to according to said current detection signal, when powering on, produce said dim signal.
In the linear constant-current controller of the utility model, owing to need not use special light modulation device to realize the switch dimming function, and high-voltage MOS pipe is integrated in controller inside, thus reached energy-efficient effect with extremely low cost.
Description of drawings
For understanding the utility model better, hereinafter combines accompanying drawing that the utility model is described further with embodiment.In the accompanying drawing:
Fig. 1 is the linear constant current scheme sketch map of prior art;
Fig. 2 is the electrical block diagram of the linear constant-current controller of the utility model one embodiment;
Fig. 3 is the electrical block diagram of the linear constant-current controller of another embodiment of the utility model;
Fig. 4 is the signal waveform sketch map of two sections light modulations of the utility model.
Embodiment
The key that realizes linear constant current switch dimming function is, after load is stopped power supply to LED, for example 3 seconds with interior power-down state under, controller is wanted to discern this power-down actions, and can adjust the luminance state with ' remembeing ' load.Be no more than 3 seconds in the power-down state duration, under the situation about re-powering, controller should make the LED load light with new luminance state.And continue under the situation more than 3 seconds at power-down state, controller should be able to reset.
Therefore, primary need just provide interim power supply, being used under power-down state is the controller power supply, to realize the function of ' memory '.The utility model uses capacitor to serve as interim power supply dexterously.Solved after the problem of interim power supply, what face is how a series of logical operations realize, for example, how to judge whether the LED load is in power-down state, how to adjust luminance state, whether how to know the power down time above for example 3 seconds, or the like.
With reference to Fig. 2, Fig. 2 is the electrical block diagram of the linear constant-current controller of the utility model one embodiment.Wherein, rectifier bridge 180, LED load 190 and resistance 103 are similar with Fig. 1.Different with existing linear constant current scheme shown in Figure 1 is, at the power end VCC of controller 200 and between with reference to ground, a capacitor 204 is set, and has replaced the voltage stabilizing didoe 104 among Fig. 1.And be positioned at the inner VCC clamp circuit 205 of controller 200, and act on identically with voltage stabilizing didoe, that is, limit the ceiling voltage of VCC, thereby avoid controller 200 to suffer the infringement of too high voltages.Capacitor 204 gives controller 200 power supplies under power-down state as interim power supply.Generally speaking, the capacity of capacitor 205 is bigger, for example can more than 1uF, just can under power-down state, for controller 200 energy more than several seconds be provided.
As shown in Figure 2, controller 200 comprises high-voltage MOS pipe 201, error amplifier 214 and light adjusting circuit 220.Here, high-voltage MOS pipe 201 being placed the inside of controller 200, is from the consideration that reduces cost.Controller 200 can be integrated on the chip.
The drain electrode of high-voltage MOS pipe 201 is connected to input voltage source VIN through LED load 190, and its source electrode is connected to reference to ground through detecting resistance 202, and grid is connected with the output of error amplifier 214.Preferably, the drain breakdown voltage of high-voltage MOS pipe 201 is greater than the maximum voltage value of input voltage source VIN.With detecting the outside that resistance 202 places controller 200, it is able to programme to make that output current passes through this resistance.Certainly, also can this resistance be placed the inside of controller 200, only realize not the able to programme of output current.
The electric current of LED load 190 flows through through high-voltage MOS pipe 201 and detects resistance 202, and the detection signal V (CS) that is produced is sent to the negative terminal of error amplifier 214.Like this, error amplifier 214, high-voltage MOS pipe 201 and detection resistance 202 just form a feedback loop.Current detection signal V (CS) is sent to light adjusting circuit 220 simultaneously, and is final, is sent to the anode of error amplifier 214 by the dim signal DIMOUT of light adjusting circuit 220 generations.
Negative feedback control makes the positive and negative input voltage of error amplifier 214 equate, just V (DIMOUT)=V (CS)=I
LED* R
202(1)
So
I
LED＝V(DIMOUT)/R
202 (2)
Therefore, just can change the LED electric current, also just can adjust the brightness of LED load 190 through the voltage that changes dim signal DIMOUT.
In the light adjusting circuit 220, power down judgement and brightness regulating circuit 240 are used for judging whether LED load 190 is in power-down state, and when recovering to power on, change the voltage of dim signal DI MOUT.Power down judgement and brightness regulating circuit 240 comprise comparator 213, timer 212 and luminance state register and decoder 211.
After turning off power supply, the electric current of LED load 190 drops to zero soon, and lamp has not worked.So, just can confirm through the electric current that detects LED load 190 whether it is in power-down state.Comparator 213 compares current detection signal V (CS) and reference signal VREF1.VREF1 is far smaller than V (DIMOUT), is approximately zero, drops to very little side with the electric current of guaranteeing LED load 190 and makes the output state of comparator 213 become height.Comparator 213 is output as height will start timer 212.When timer 212 is full by scheduled time timing; If comparator 213 output be always height (promptly; The electric current of LED load 190 continues very little), then timer 212 is exported a high logic level, and this high logic level is sent to the SET end of luminance state register and decoder 211.
Preferably, the above-mentioned scheduled time of timer 212 can be made as at least 10 milliseconds.This be because, the 50Hz that global lighting mains provides, 60Hz alternating current, through after the full-bridge rectification, frequency becomes 100Hz and 120Hz respectively, and the corresponding cycle of 100Hz frequency is exactly 10 milliseconds.This means, 10 milliseconds of every mistakes, line voltage will be through zero passage, it is zero that this no-voltage might cause the electric current of LED load, just since its frequency up to 100Hz, the subtle variation of human eye to LED load brightness.The scheduled time of timer 212 is made as more than 10 milliseconds, is exactly disconnected for fear of above-mentioned erroneous judgement.
Luminance state register and decoder 211 can be regarded the high logic level that the SET termination is received as power-down actions one time, and adjustment luminance state register.The luminance state register is with the monochrome information of certain coding form storage LED load, for example, represents 100% brightness with 00, and 01 represents 50% brightness etc.The SET end is used to adjust register information, and the RST end is used for reseting register.The coded message that decoder will be stored in the register is translated out, and corresponding dim signal DIMOUT is outputed to error amplifier 214, for example; Be decoded as DIMOUT=0.5V with 00; 01 is decoded as DIMOUT=0.25V, and the former brightness is 100%, and the latter's brightness is 50%.
If within the maximum power down time (for example 3 seconds), power on once more, luminance state register and decoder 211 will be exported new DIMOUT voltage and give error amplifier 214, and LED load 190 is just lighted with new output current, and brightness changes thereupon.
In the light adjusting circuit 220, reset circuit 230 is used for surpassing maximum power down during the time in power down, and luminance state register and decoder 211 zero clearings are resetted.Reset circuit 230 comprises resistance 206, resistance 207 and comparator 209.Wherein, resistance 207 is connected to the power end VCC of controller 200, and resistance 206 is connected in series with resistance 207, and resistance 206,207 is parallelly connected with capacitor 204.
After the power down, along with the prolongation of power down time, the voltage VCC on the capacitor 204 can descend gradually, resistance 207 and 206 pairs of VCC dividing potential drops of resistance.Dividing potential drop and reference signal VREF2 that comparator 209 will produce on resistance 206 compare, and VREF2 representes reset threshold.When voltage VCC falls enough lowly, make dividing potential drop on the resistance 206 less than reset threshold, comparator 209 is just exported the RST end of high logic level to luminance state register and decoder 211, removes the zero clearing luminance state register that resets.The height of reference signal VREF2 is worth the length that big young pathbreaker determines the maximum power down time with the appearance of capacitor 204.
With reference to Fig. 3, Fig. 3 is the electrical block diagram of the linear constant-current controller of another embodiment of the utility model.Among this embodiment, except that in power down judgement and brightness regulating circuit 241, set up a comparator 208 and one or the door 210, remainder and embodiment illustrated in fig. 2 similar.
Among this embodiment, can pass through to detect voltage VCC simultaneously, or judge power-down state through detecting the LED load current.Obviously, provide these two kinds be or the power-down state judgment mode of relation, can further improve stability, the reliability of controller circuitry.
With reference to Fig. 4, Fig. 4 is the part signal waveform that example shows the utility model with two sections light modulations.One of which illustrates the situation that dim signal DIMOUT adopts direct current signal or pwm signal; Corresponding respectively simulation dimming mode and PWM dimming mode; The former changes the LED electric current through changing the direct voltage size, and the latter changes the LED average current through changing pulse duty factor; Two to illustrate with 3 seconds be the maximum power down time of example for it; It three illustrates the VCC reset threshold, and when VCC is lower than this threshold value, controller will be reset.
In the description of preamble, the maximum power down time be 3 seconds just one can according to actual needs the maximum power down time be made as other numerals for example, like the Any Digit between 0.5 second to 5 seconds.And the utility model is not limited to the driving LED load, but can be used for driving any current source loads.This is understandable to those skilled in the art.
Obviously, the utility model described here can have many variations, and this variation can not be thought spirit and the scope that departs from the utility model.Therefore, the change that all it will be apparent to those skilled in the art all is included within the covering scope of appended claims.
Claims (10)
1. linear constant-current controller, its power end with reference to ground between be connected a capacitor, in order to be said controller power supply under power-down state, said controller comprises:
High-voltage MOS pipe, its drain electrode is connected to input voltage source through current source loads, and its source electrode detects resistance through one and is connected to reference to ground;
Error amplifier, one input end receives the detection signal of the said current source loads electric current of flowing through, and another input receives a dim signal, and its output connects the grid of said high-voltage MOS pipe; And
Light adjusting circuit in order to according to said current detection signal, produces said dim signal when powering on.
2. controller as claimed in claim 1 is characterized in that said light adjusting circuit comprises power down judgement and brightness regulating circuit, and said power down judgement and brightness regulating circuit comprise:
First comparator in order to said current detection signal and the reference signal that is approximately zero are compared, and produces the first output signal;
Timer, in order to a scheduled time then, with said first output signal see off; And
Luminance state register and decoder, the first output signal adjustment luminance state register based on timer is seen off changes said dim signal when powering on.
3. controller as claimed in claim 2 is characterized in that, the said scheduled time is at least 10 milliseconds.
4. controller as claimed in claim 2 is characterized in that said light adjusting circuit also comprises reset circuit, and said reset circuit comprises:
First resistance that is connected with said controller power source end;
With second resistance that said first resistance is connected in series, said first, second resistance is parallelly connected with said capacitor; And
Second comparator compares in order to the dividing potential drop and a reset threshold that will on said second resistance, produce, and produces the second output signal,
Based on the said second output signal, said luminance state register and decoder reset.
5. controller as claimed in claim 4 is characterized in that, said power down judgement and brightness regulating circuit also comprise:
The 3rd comparator compares in order to the dividing potential drop and a power down threshold value that will on said second resistance, produce, and produces the 3rd output signal; And
Or door, one input end receives said the 3rd output signal, and another input receives the first output signal that said timer is seen off, and its output is connected to said luminance state register and decoder, provides signal with adjustment luminance state register.
6. controller as claimed in claim 1 is characterized in that, said dim signal adopts direct current signal or pwm signal.
7. controller as claimed in claim 1 is characterized in that the drain breakdown voltage of said high-voltage MOS pipe is greater than the maximum voltage value of input voltage source.
8. controller as claimed in claim 1 is characterized in that, said current source loads is the LED load.
9. a chip is characterized in that, comprises each described controller in the claim 1 to 8.
10. a device that drives current source loads comprises a linear constant-current controller and a capacitor, and said capacitor is connected the power end of said controller and with reference between the ground, in order to be said controller power supply under power-down state, said controller comprises:
High-voltage MOS pipe, its drain electrode is connected to input voltage source through said current source loads, and its source electrode detects resistance through one and is connected to reference to ground;
Error amplifier, one input end receives the detection signal of the said current source loads electric current of flowing through, and another input receives a dim signal, and its output connects the grid of said high-voltage MOS pipe; And
Light adjusting circuit in order to according to said current detection signal, produces said dim signal when powering on.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203649561U CN202210893U (en) | 2011-09-28 | 2011-09-28 | Linear constant-current controller, chip, and drive device |
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| CN2011203649561U CN202210893U (en) | 2011-09-28 | 2011-09-28 | Linear constant-current controller, chip, and drive device |
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| CN202210893U true CN202210893U (en) | 2012-05-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104010420A (en) * | 2014-06-06 | 2014-08-27 | 上海晶丰明源半导体有限公司 | Color-temperature-adjustable module and color-temperature-adjustable LED driving circuit and system |
| CN104244517A (en) * | 2014-08-22 | 2014-12-24 | 上海晶丰明源半导体有限公司 | Brightness-adjustable module and bright-adjustable LED drive system |
-
2011
- 2011-09-28 CN CN2011203649561U patent/CN202210893U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104010420A (en) * | 2014-06-06 | 2014-08-27 | 上海晶丰明源半导体有限公司 | Color-temperature-adjustable module and color-temperature-adjustable LED driving circuit and system |
| CN104010420B (en) * | 2014-06-06 | 2016-06-22 | 上海晶丰明源半导体有限公司 | Adjustable color temperature module, the LED drive circuit of adjustable color temperature and system |
| CN104244517A (en) * | 2014-08-22 | 2014-12-24 | 上海晶丰明源半导体有限公司 | Brightness-adjustable module and bright-adjustable LED drive system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120502 Termination date: 20140928 |
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| EXPY | Termination of patent right or utility model |